The section many chemical and pysical changes are Happening In nature relate to section "matter Isn't lost In photosynthesis" by the fact that,It provides another example of how matter is conserved within ecosystems.
What is mass conservation?Similar to the law of conservation of energy, the total mass of a system is conserved. Mass can neither be created nor be destroyed. However, the mass of a system can be transferred to another system or can be converted as heat energy.
Photosynthesis is the process of synthesizing chemical energy in green plants using light energy. The reaction involves the combination of carbon dioxide and water to form glucose and oxygen gas.
In this reaction, the total mass of the reactants is exactly equal to the total mass of the products. Hence, the mass is conserved. This is the case for all balanced chemical reactions and physical changes. Hence, option A is correct.
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Calculate the amount of heat needed to heat 190.0 g of liquid water from 18 °C to 100°C.
To solve this we must be knowing each and every concept related to Enthalpy. Therefore, the amount of heat needed to heat 190.0 g of liquid water from 18 °C to 100°C is 12,281.6 Joules.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of solution ×specific heat capacity of solution× Change in temperature.
Q = m × c ×Δt
Mass of water vapor, m = 190.0 g
Change in temperature, Δt = 150°C - 118°C
= 32°C
specific heat capacity of water vapor = 2.02 J/g°C
Amount of heat = 190.0 g × 2.02 J/g°C × 32°C
= 12,281.6 Joules
Therefore, the amount of heat needed to heat 190.0 g of liquid water from 18 °C to 100°C is 12,281.6 Joules.
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An impact crater forms when a meteor hits the earth’s surface with enough mass and velocity. A maar is a volcanic crater that forms when magma interacts with groundwater and causes a small explosion. Which statement about impact craters and maars is correct?
A) Both impact craters and maars form over short periods of time.
B) Impact craters form over short periods of time, and maars form over long periods of time.
C) Both impact craters and maars form over long periods of time.
D) Impact craters form over long periods of time, and maars form over short periods of time.
The statement that is correct is that; "Impact craters form over long periods of time, and maars form over short periods of time." Option D
What is the impact?It should be clear that the impact would have to do with a large force that is going to act for a short time. As such the effect of the impact can be found to be very large because the force is able to cause a lot of damage.
In this case, we have two scenarios, an impact crater forms when a meteor hits the earth’s surface with enough mass and velocity. A maar is a volcanic crater that forms when magma interacts with groundwater and causes a small explosion.
The impact of the later would be seen to be much greater than the former because the force is large and it does acts for a much longer time and this would lead to a greater magnitude of the impact.
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A molecule can be either an element or a compound true or false
Answer:
True
Explanation:
Which of the following describes an energy transformation from electrical energy to thermal energy?
Answer:
A toaster
Explanation:
It uses electrical energy and converts it to heat.
Determine the [H3O+] of a 0.210 M solution of formic acid. Express your answer using two significant figures. ? [H3O+]=
Since [HA] = [H3O+], we can conclude that the [H3O+] of a 0.210 M solution of formic acid is 0.210 M.
What is formic acid?Formic acid (HCOOH) is a colorless, volatile, and flammable liquid with a strong, pungent odor reminiscent of vinegar.
The [H3O+] of a 0.210 M solution of formic acid can be determined using the Henderson-Hasselbalch equation, which states that:
pH = pKa + log([A-]/[HA])
Where [A-] is the concentration of the acid's conjugate base and [HA] is the concentration of the acid itself.
Formic acid has a pKa of 3.75, so we can rearrange the equation to calculate [HA] as:
[HA] = [A-] * 10^(pKa - pH)
We know that [A-] = 0.210 M and pH = 3.75, so plugging this into the equation gives us:
[HA] = 0.210 M * 10^(3.75 - 3.75)
[HA] = 0.210 M
Since [HA] = [H3O+], we can conclude that the [H3O+] of a 0.210 M solution of formic acid is 0.210 M.
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calculate the standard entropy change for the reaction p4(g)+5o2(g)→p4o10(s)
The standard entropy change for the reaction p4(g)+5o2(g)→p4o10(s) is -843.1 J/mol•K.
ΔS° = -843.1 J/mol•K
The standard entropy change for a reaction can be determined by looking up the standard entropies of the reactants and products in a table and then using the equation:
ΔS° = ΣS°products - ΣS°reactants
We can look up the standard entropies of the reactants and products in a table and then use the equation above to calculate the standard entropy change for the reaction:
p4(g): S° = 162.9 J/mol•K
O2(g): S° = 205.0 J/mol•K
P4O10(s): S° = 806.0 J/mol•K
ΔS° = (5 x 205.0 J/mol•K) + 806.0 J/mol•K - (162.9 J/mol•K)
ΔS° = -843.1 J/mol•K
The standard entropy change for the reaction p4(g)+5o2(g)→p4o10(s) is -843.1 J/mol•K.
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Which of these molecules are linear? Check all that apply. XeF2 BeCl2 SF2 NO2-
According to the molecular geometry, XeF₂ and BeCl₂ molecules have linear geometry.
What is molecular geometry?
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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the volume of 0.15 mol of an ideal gas at 365 torr and 97 °c is ________ l.
The volume of 0.15 mol of an ideal gas at 365 torr and 97 °C is 9.5 L.
An ideal gas is a hypothetical gas that follows the ideal gas law, which states that the pressure, volume, and temperature of an ideal gas are directly related.
The ideal gas law can be used to calculate the volume of an ideal gas, given the number of moles, temperature, and pressure.
The ideal gas law equation is: PV = nRT.
Rearranging the equation to solve for volume, the equation is V = nRT/P. Plugging in the given values, the volume of 0.15 mol of an ideal gas at 365 torr and 97 °C is 9.5 L.
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8th grade draw a model of 4 water molecules that are bonded together color coded, labeled covalent and hydrogen bonds between atoms and molecules
science
The image of the hydrogen bonding in water is shown in the image attached.
What is hydrogen bonding?We know that the hydrogen bond has to do with the kind of bond that is existing between hydrogen and a highly electronegative atom in a compound. For instance in the water molecule, there is the hydrogen bond that is working between the oxygen atom and the hydrogen atom.
We can see that the image the hydrogen bonded water molecule has been color coded and the colors do stand in for the hydrogen and the oxygen atoms as well as the diverse kinds of interactions in the molecule.
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Using information from your IR spectra for borneol, camphor and isoborneol, answer the following questions:
a. Which peak/s are present in both spectra of pure borneol and pure camphor between 1500 cm-1 - 4000 cm-1 ______________ cm-1
Which functional group/s are responsible for this peak ___________
b. Which peak is present in the spectrum of pure borneol and absent in that pure camphor between 1500 cm-1 - 4000 cm-1 ______________ cm-1
Which functional group/s are responsible for this peak ___________
c. Which peak is present in the spectrum of pure camphor and absent in that pure borneol between 1500 cm-1 - 4000 cm-1 ______________ cm-1
Which functional group/s are responsible for this peak ______________
. Would you expect the IR spectra of borneol and isoborneol to be the same or different? Provide a reason for your answer.
Thank you very much. I appreciate you answering all my questions.
The functional groups can be identified via IR Spectroscopy, which monitors atom vibrations.
How do you find the IR spectrum of a compound?It is feasible to identify the functional groups using IR Spectroscopy, which monitors the atoms' vibrations. 5 Typically, lighter atoms and stronger connections will vibrate with a higher stretching frequency (wavenumber).
IR spectra of solids and liquids are often produced using straightforward liquid cells after the sample has been dissolved in a solvent that is moderately IR transparent, like CCl4. Another method for studying a solid directly involves grinding it into a fine paste using NUJOLTM, a blend of highly pure hydrocarbons.
The process involves passing infrared light through the organic compound we wish to identify; some of the frequencies are absorbed by the compound, and if we keep track of the light that passes through, the precise frequencies of the absorptions may be determined.
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The chemical formula for naphthalene is C10H8. It’s used to make mothballs and pesticides.
In 4C10H8, the coefficient is , the subscript of carbon is , and the subscript of hydrogen is .
In [tex]4C_{10}H_8[/tex], the coefficient is 4, the subscript of carbon is 10, and the subscript of hydrogen is 8.
Coefficients of chemical formulasChemical formulas can be empirical or molecular. Empirical formulas have the lowest possible whole-number ratio of atoms that make up substances. Molecular formulas, on the other hand, could have whole-number ratios that could be in multiples.
Thus, each atom in chemical formulas has its respective subscripts which indicate the amount of the atom present in the formula. In chemical equations, the coefficients are the number written before chemical formulas.
Thus, in [tex]4C_{10}H_8[/tex], the coefficient is 4, the subscript of carbon is 10, and the subscript of hydrogen is 8.
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Which best describes what happens to the atoms during the combustion of ethanol? A. The reactant atoms are changed into product atoms. B. Many more atoms are added as the reaction volume grows. C. The reactant atoms are destroyed and new product atoms are formed. D. The atoms rearrange into different molecules but no atoms are destroyed or formed.
The best option which best describes atoms during the combustion of ethanol is that the atoms rearrange into different molecules but no atoms are destroyed or formed and is therefore denoted as option D.
What is Combustion?This is referred to as the process where a substance burns in the presence of oxygen, giving off heat and light in the process.
During combustion of ethanol , the atoms present in it and oxygen are rearranged to form carbon dioxide and water which are regarded as the product of the reaction which is thereby the reason why it was chosen as the correct choice.
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Water , H 2 underline O. , has hydrogen bonding (an attractive force) between molecules whereas H_{2}*S , a molecule with a similar size and shape to H 2 underline O, , does not have hydrogen bonding . Which compound would you predict would have the lowest boiling point ? Explain
Water , H 2 underline O. , has hydrogen bonding (an attractive force) between molecules whereas H_{2}*S , a molecule with a similar size and shape to H 2 underline O, does not have hydrogen bonding . H₂S would have the lowest boiling point.
What is hydrogen bonding ?A hydrogen bond is an attraction that is predominantly electrostatic between an electronegative atom that is the hydrogen bond acceptor and an electronegative atom that is covalently attached to a greater electronegative "donor" atom or group.
The lowest boiling point is for H2S. The boiling point rises as the intermolecular forces of attraction grow. The main interaction factors that contribute to the rise in boiling point are hydrogen bonding and dispersion forces.
Compared to H2O molecules, H2S molecules participate in weaker hydrogen bonds. This is due to sulphur's weaker electronegativity than oxygen. The hydrogen bonds in H2S can therefore be broken with less energy.
Thus, the boiling point of H2S is lower than that of H2O.
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We just saw that the mass ratio ANSWER NOW! of nitrogen to hydrogen in ammonia is 4.7:1. If a sample of ammonia contains 10.0 g of H, how many grams of N does it contain
A sample of ammonia containing 10.0 grams of hydrogen will also contain 47 grams of nitrogen.
The mass ratio reveals an element's mass when it is present in combination with another element. This means that it is the proportion of a specific molecule made up of each of its individual elements. To find the mass ratio of two elements, we will divide the mass of one element by the mass of another element. Here, the mass ratio of nitrogen and hydrogen is given as, [tex]\begin{aligned}\mathrm{\frac{m_N}{m_H}}&=\frac{4.7}{1}\end{aligned}[/tex]. If the value of [tex]\mathrm{m_H}[/tex] is 10.0 g, then the mass of nitrogen will be calculated as follows,
[tex]\begin{aligned}\mathrm{m_N}}&=\frac{4.7}{1}\times10.0\\&=\mathrm{47\;g}\end{aligned}[/tex]
The required answer is 47 g.
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need description of the rocks on table B, read the instructions. I already have the rocks sorted out
Conglomerate is a type of rock that is made up of rounded fragments of rock that are held together by a matrix of finer materials, such as sand or clay. It is typically formed in a shallow marine environment or near the mouth of a river.
Limestone is a sedimentary rock that is composed mostly of calcite, a mineral made up of the remains of marine organisms such as coral and mollusks. It is formed in a variety of environments, including shallow marine, tidal flat, and lagoonal environments.
Basalt is an igneous rock that is formed from the solidification of molten lava. It is characterized by its dense, fine-grained texture and is commonly found in the form of volcanic lava flows or as the cooled top layer of a lava dome.
Trilobite is not a rock; it is a type of fossil that is found in sedimentary rocks such as shale and sandstone. Trilobites were arthropods that lived during the Paleozoic Era, from about 521 to 252 million years ago. They are characterized by their distinctive three-lobed bodies and are known for the many different species that existed during this time period.
What is a rock?A rock is a naturally occurring solid substance composed of one or more minerals, mineraloids, or organic materials. It is typically formed through geological processes such as heat and pressure, and it can be found in a variety of environments on Earth, including on the surface and underground. There are three main types of rocks: igneous, sedimentary, and metamorphic.
Therefore, the correct answers are as given above
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Which of the following observations about a certain pure solid would indicate most strongly that the solid is ionic
A Its water solution is a good conductor of electricity.
It is composed of small white crystals.
C It has a density greater than 1.0 gram/cm³.
D) It has a high melting point.
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. Therefore, the correct option is option A.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds. A pure solid would indicate most strongly that the solid is ionic if its water solution is a good conductor of electricity.
Therefore, the correct option is option A.
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what is the concentration of a solution, in parts per million, if 3.064 g of NaCl is dissolved in 1159.36 g of solution
The concentration of a solution, in parts per million, if 3.064 g of NaCl is dissolved in 1159.36 g of solution is: 2,642.84 ppm.
How to find the Concentration of a solution?Using this formula to find the concentration of a solution
Concentration of a solution = Grams of solute / Grams of solution × 1,000,000
Where:
Grams of solute = 3.064 g
Grams of solution = 1159.36 g
Let plug in the formula
Concentration of a solution = 3.064 g / 1159.36 g x 1,000,000
Concentration of a solution = 2,642.84 ppm
Therefore we can conclude that the Concentration of a solution is 2,642.84 ppm.
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42. Enzymesare organic compounds classified as
a. Nucleic acids.
b. Carbohydrates.
c. Lipids.
d. Steroids.
e. Proteins.
1. Show the calculation of the final temperature of the mixture when a 40.5 gram sample of water at 85.7oC is added to a 36.8 gram sample of water at 26.3oC in a coffee cup calorimeter.
c (water) = 4.184 J/g oC
2. Show the calculation of the energy involved in melting 120 grams of ice at 0oC if the Heat of Fusion for water is 0.334 kJ/g.
3. Sulfur undergoes combustion to yield sulfur trioxide by the following reaction equation:
2 S + 3 O2 → 2 SO3 ΔH = - 792 kJ
If 42.8 g of S is reacted with excess O2, what will be the amount of heat given off?
4. Hydrosulfuric acid (H2S) undergoes combustion to yield sulfur dioxide and water by the following reaction equation:
2 H2S + 3 O2 → 2 SO2 + 2 H2O
What is the ΔH of the reaction if 26.2 g of H2S reacts with excess O2 to yield 431.8 kJ?
Calculate the final temperature of the water mixture using the equation T(final) = (m1_T1 + m2_T2) / (m1 + m2), where m1 and m2 are the weights of the water in the first and second containers, T1 is the temperature of the water.
What is the formula to find the final temperature of a mixture?Let T be the final temperature of the mixture of 50g of water at 20°C and 50g at 40°C. Let S represent the water's specific heat capacity. Therefore, a mixture of 50g of water at 20°C and 50g of water at 40°C would have a final temperature of 30°C. The final heat of your substance can be calculated by adding the temperature change to the starting point. Your water's final temperature would be 24 + 6, or 30 degrees Celsius, for instance, if it started off at 24 degrees Celsius. Once more, you solve for T, the final temperature, using the formula q = mcT, but this time you assume that qaluminum = qwater. For aluminium and water, you must check up the specific heat values (c).To learn more about final temperature refer to:
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Answer to Indicate whether each of the following structures has the R or the S configuration: a. CH(CH3)
b. 2 CH;CH
c. CH, CH,
d. Br CH3
The first structure has the R configuration, the second and third structures have the S configuration, and the fourth structure has the R configuration
a. CH(CH3) - In this structure, the chiral carbon is bonded to three different groups so it has the R configuration.
b. 2 CH;CH - In this structure, the chiral carbon is bonded to two different groups so it has the S configuration.
c. CH, CH, - In this structure, the chiral carbon is bonded to two different groups so it has the S configuration.
d. Br CH3 - In this structure, the chiral carbon is bonded to three different groups so it has the R configuration.
The first structure has the R configuration, the second and third structures have the S configuration, and the fourth structure has the R configuration
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What volume of a 0.500 M solution should be diluted to make 250 mL of a 0.400 M solution?Select one:a. 150 mLb. 20.0 mLc. 100 mLd. 250 mLe. 200 mL
To calculate the volume of a 0.500 M solution that should be diluted to make 250 mL of 0.400 M solution, we use the equation M1V1 = M2V2.
M1V1 = M2V2
(0.500 M)(V1) = (0.400 M)(250 mL)
V1 = 200 mL
To calculate the volume of a 0.500 M solution that should be diluted to make 250 mL of 0.400 M solution, we use the equation M1V1 = M2V2. This means that the molarity of the initial solution (M1) multiplied by the volume of the initial solution (V1) is equal to the molarity of the final solution (M2) multiplied by the volume of the final solution (V2). In this case, M1 is 0.500 M and V2 is 250 mL. When we solve the equation, we find that V1, or the volume of the initial solution, is 200 mL. Therefore, to make 250 mL of a 0.400 M solution, we need to dilute 200 mL of a 0.500 M solution.
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complete the relationship. __________ nm = __________ cm.
The relationship is 1 × 10⁹ nm = 100 cm. The 1 centimeter is equals to the 10000000 or 1 × 10⁷ nanometers.
The 1 centimeter, cm is equals to the 1 × 10⁷ nanometers or nm.
1 cm = 1 × 10⁷ nm
The centimeter is the unit of the length. The SI symbol for the centimeter is cm. The metric unit of the length is the centimeter. 1 cm is equals to the 0.3937 inches. 1 inch is equal to the 2.54 centimeters.
The nanometers is the unit of the length in the international system. 1 nanometer is equal to the 1 × 10⁻⁹ meter or 1 / 1000000000 meters.
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Some help on this, please? (Didn't know what topic to put it in, apologies)
The way in which soil aeration affects porosity of soil is described below.
What is soil porosity?Soil porosity is the term used to describe the amount of open space or pore space that can be found between particles of soil.
Soil porosity also determines the amount of oxygen that can be found in pore spaces. In addition to water, plants must have oxygen to grow and thrive.
Aeration is the process by which air is circulated through or mixed with a substance such as soil or a liquid.
One of the primary reasons that plants need pore space is because oxygen gets stored in the pores Therefore, soil porosity is influenced by soil aeration.
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"Choose the correct IUPAC name for the following bicyclic compound. A. 2-fluorobicyclo[2.2.1]hexane B. 2-fluorobicyclo[2.1.1]hexane C 5-fluorobicyclo[2.1.1]hexane D. 6-fluorobicyclo[2.1.1]hexane E. 3-fluorobicyclo[2.2.0]pentane F. 4-fluorobicyclo[2.1.0Jpentane A "
5-fluorobicyclic cyclo[2.1] .1] I should have said hexane.
What purpose serves hexane?Hexane is a special-purpose solvent that can also be used as a cleaning agent and to extract edible oils from seeds and vegetables. Humans exposed to high quantities of hexane through acute (short-term) inhalation experience modest central nervous system (CNS) side effects include giddiness, nausea, headache, and dizziness.
What does hexane appear in?What is hexane, and where can you find it? Hexane is a chemical that is frequently derived from crude oil and petroleum. It is an invisible liquid with a faint, gasoline-like odour. Even though hexane is very flammable, it can be found in a variety of everyday items, including stain removers for arts and crafts projects.
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How many grams are in 4.7 molecules of Na2O
The number of grams of 4.7 molecules of Na₂O is 291.4grams.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:
mass = no of moles × molar mass
Molar mass is the mass of a given substance divided by its amount, measured in moles. It is commonly expressed in grams/mole.
According to this question, there are 4.7 moles in sodium oxide. The molar mass of Na₂O is 62g/mol.
mass = 62g/mol × 4.7moles
mass = 291.4grams
Therefore, 291.4grams is the mass of the sodium oxide.
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Explain how cobalt chloride papers can be used as humidity detectors
Answer:
Cobalt chloride papers are often used as humidity indicators because they change color in response to the relative humidity of the air. When the air is dry, the cobalt chloride paper is blue or purple. As the air becomes more humid, the paper turns pink or red. The color change is reversible, meaning that the paper will return to its original color as the humidity decreases.
calculate δh∘ for ti(s)+2cl2(g)→ticl4(g)
Express your answer using four significant figures.
ΔS∘ for Ti(s)+2Cl2(g)→TiCl4(g) is 659.6J/mol The change in entropy (ΔS) for a chemical reaction can be calculated using the standard entropies (S°) of the reactants and products.
What are the three significant figures?The same as when rounding to three decimal places, we also round a number into three significant figures.For three digits, we start counting with the first non-zero digit.Next, we round the final digit.Any empty spaces to a right of the decimals are filled with zeros.
What is a four significant figure example?Each of the numbers 279.0, 27.90, and 2.790 has 4 significant digits.Once more, the first three digits are known for sure, and the last number is always regarded as important.There are 4 and 5 great factors in the numbers 0.2790 and 0.27900, respectively.
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According to the video, why should a used chemical container never be refilled? B U T? T, O Word(s) 5. Certain glass objects are not meant to be heated and could shatter if exposed to a heat source. What two examples of heat-sensitive glassware are given in the video? Word(s) I U = TT, B
Two examples of heat-sensitive glassware are graduated cylinders and flasks which should be used with personal protective equipments.
What are personal protective equipments?
Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.
It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.
It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.
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1) A semimetal in group 8A
2)An alkali metal with a lower atomic number than barium
Arsenic belongs to the semimetal group 8A. Beryllium is the alkaline earth metal with the lowest atomic number.
What is periodic table?The periodic table, commonly known as the periodic table of the elements, is an arrangement of chemical elements in rows and columns. It is frequently utilized in chemistry, physics, and other disciplines, and is widely regarded as a chemical icon. The periodic table is a tabular array of chemical elements sorted by atomic number, beginning with hydrogen and progressing to oganesson, which has the greatest atomic number. Because of the arrangement of the elements, it is known as the periodic table. You'll note that they're organized in rows and columns. Periods are horizontal rows that run from left to right, while groups are vertical columns that run from top to bottom.
Here,
Arsenic is a semimetal of group 8A. Beryllium has the least atomic number of any alkaline earth metal.
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More water leaves the oceans through evaporation than is added to the oceans through precipitation. Which process keeps ocean water levels from dropping?
A.
evaporation
B.
transpiration
C.
condensation
D.
runoff
The process that keeps ocean water levels from dropping is called A. evaporation.
What is the physical phenomenon of evaporation?The physical phenomenon of evaporation can be defined as the passage of a given compound from a liquid state to a gaseous state which in the case of water is represented by vapor water that condenses and falls into the oceans as precipitation.
Therefore, with this data, we can see that the physical phenomenon of evaporation is able to decrease the level of water in the ocean and this process is directly associated with subsequent precipitation.
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