Answer:c
Explanation:because the percent of oxygen by mass is not a funcion
How many liters will a cubic box 36 inches long hold?
What is the acceleration of a 5 kg object if a force of 50 N was applied to it?
Answer: An applied force of 50 N is used to accelerate an object to the right across. A 5-kg object is sliding to the right and encountering a friction force that slows it down. Explanation: m=1000 kg and a=3m/s2 . hence, the force needed to accelerate the 1000kg car by 3m/s2 is 3000N
Explanation: PLEASE MARK ME AS BRAINLIEST
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One of the isotops of neon, neon-22, has an atomic number of 10 and a mass number of 22. in order, how many protonsz electrons anf neutrons are present in its atom?
a) 12, 10, 22
b) 10, 10, 12
c) 12, 12, 10
d) 10, 12, 22
The answer should be d) 10, 12, 22
How many grams of water can I convert from a liquid to a gas with 6768 joules?
Answer:
The amount of water converted from liquid to gas with 6,768 joules is approximately 3.035 g
Explanation:
The amount of heat required to convert a given amount of liquid to gas at its boiling point is known as the latent heat of evaporation of the liquid
The latent heat of evaporation of water, Δ[tex]H_v[/tex] ≈ 2,230 J/g
The relationship between the heat supplied, 'Q', and the amount of water in grams, 'm', evaporated is given as follows
Q = m × Δ[tex]H_v[/tex]
Therefore, the amount of water, 'm', converted from liquid to gas at the boiling point temperature (100°C), when Q = 6,768 Joules, is given as follows;
6,768 J = m × 2,230 J/g
∴ m = 6,768 J /(2,230 J/g) ≈ 3.035 g
The amount of water converted from liquid to gas with 6,768 joules = m ≈ 3.035 g.
Classify each of the following as either a physical change or a chemical change:
a. tearing a sheet of paper
b. melting a piece of wax
c. burning a log
d. milk souring
Answer:
physical change
a b c
chemical change
d
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Calculate the percentage of yield when 20 grams of sodium chloride solution reacts with an excess amount of silver nitrate solution knowing that 45 grams of silver chloride precipitated
%yield = 91.8
Further explanationGiven
20 g NaCl
45 g AgCl
Required
%yield
Solution
Reaction
NaCl + AgNO₃ ⇒ AgCl + NaNO₃
mol NaCl :
= mass : MW
= 20 g : 58,44 g/mol
= 0.342
mol AgCl from equation :
= 1/1 x mol NaCl
= 1/1 x 0.342
= 0.342
Mass AgCl(theoretical) :
= mol x MW
= 0.342 x 143,32 g/mol
= 49.02 g
%yield = (actual/theoretical) x 100%
%yield = (45/49.02) x 100%
%yield = 91.8
During a laboratory experiment, 9.68 g of iron reacted with excess sulfur to form 13.8 grams of iron II sulfide. Calculate the percent yield of this experiment. What would be the percentage yield if the Theoretical yield was 15.2 grams?
Answer:
Percent yield = 90.8%
Explanation:
The reaction of Fe with S to produce FeS is:
Fe + S → FeS
Where the moles of Fe added in excess of S are the moles of FeS
Now, percent yield is defined as 100 times the ratio between actual yield (13.8g of FeS) and theoretical yield (15.2g FeS):
Percent yield = 13.8g / 15.2g * 100
Percent yield = 90.8%will give brainliest if you answer all of them
Answer:
Explanation:
A. Graphite can conduct electricity because of the delocalised (free) electrons in its structure. These arise because each carbon atom is only bonded to 3 other carbon atoms. ... However, in diamond, all 4 outer electrons on each carbon atom are used in covalent bonding, so there are no delocalised electrons.
B. Diamond is hard because the carbon atoms in diamond are bonded in a stronger tetrahedron pattern but graphite is soft and slippery because the carbon atoms in graphite are bonded in layers with only weak vanderwall force holding the layers together.
Which of the following lists of properties describes the type of solid shown in the image below?
A. A characteristic geometric shape, limited particle motion, highly ordered interactions, a specific melting point
B. A random geometric shape, limited particle motion, highly ordered interactions, a specific melting point
C. A characteristic geometric shape, significant particle motion, random interactions, a wide range of melting temperatures
D. A random geometric shape, significant particle motion, random interactions, a wide range of melting temperatures
Answer:
A
Explanation:
We learned about this in chem a while back, pretty sure it's right
What is Loschmidt’s number? How is it related to Avogadro’s number?
Answer:
The mole and Avogadro’s number are two important concepts of science that provide a link between the properties of individual atoms or molecules and the properties of bulk matter. It is clear that an early theorist of the idea of these two concepts was Avogadro. However, the research literature shows that there is a controversy about the subjects of when and by whom the mole concept was first introduced into science and when and by whom Avogadro’s number was first calculated. Based on this point, the following five matters are taken into consideration in this paper. First, in order to base the subject matter on a strong ground, the historical development of understanding the particulate nature of matter is presented. Second, in 1811, Amedeo Avogadro built the theoretical foundations of the mole concept and the number 6.022 × 1023 mol−1. Third, in 1865, Johann Josef Loschmidt first estimated the number of molecules in a cubic centimetre of a gas under normal conditions as 1.83 × 1018. Fourth, in 1881, August Horstmann first introduced the concept of gram-molecular weight in the sense of today’s mole concept into chemistry and, in 1900, Wilhelm Ostwald first used the term mole instead of the term ‘gram-molecular weight’. Lastly, in 1889, Károly Than first determined the gram-molecular volume of gases under normal conditions as 22,330 cm3. Accordingly, the first value for Avogadro’s number in science history should be 4.09 × 1022 molecules/gram-molecular weight, which is calculated by multiplying Loschmidt’s 1.83 × 1018 molecules/cm3 by Than’s 22,330 cm3/gram-molecular weight. Hence, Avogadro is the originator of the ideas of the mole and the number 6.022 × 1023 mol−1, Horstmann first introduced the mole concept into science/chemistry, and Loschmidt and Than are the scientists who first calculated Avogadro’s number. However, in the science research literature, it is widely expressed that the mole concept was first introduced into chemistry by Ostwald in 1900 and that Avogadro’s number was first calculated by Jean Baptiste Perrin in 1908. As a result, in this study, it is particularly emphasised that Horstmann first introduced the mole concept into science/chemistry and the first value of Avogadro’s number in the history of science was 4.09 × 1022 molecules/gram-molecular weight and Loschmidt and Than together first calculated this number.
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Can anyone tell me what's meaning (bands of light)?
Answer:
Bands of light is where light passes through a prism of a sort. It is reflected and refracted into a continuous band of colors called a spectrum.
I thought this was a very facinating concept in school, I hope this helps. Please consider on marking me brainliest.
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the densitty of a gas in an unlabled container is 1.43g.l. is this gas oxygen,neon, or helium
BRAINLEST AND THANKS
Answer:
I believe its oxygen gas
Explanation: The density of a gas is 1.43 g/L
The four beakers above each contain 100.-mL of different solutions of similar concentrations.
(a) The Kb for ammonia is 1.8 x 10^-5
(i) Which beaker is most likely to contain NH3(aq)? Provide a chemical equation to explain your answer.
(ii) Calculate the molarity of the solution in the beaker that you chose for (i).
(b) If the contents of beakers 3 and 4 are poured together and mixed thoroughly, what will be the resulting pH?
(c) Explain how it is possible that beakers 1 and 4 are acids with equal molarities.
What charge do Group 2 elements develop when they become ions? helppp :)
Calculate the mass of beryllium and phosphorus in 39.8g of beryllium phosphide
Answer:
12.8 grams
Explanation:
Enzymes are essential to cells because they are responsible to either making or breaking other molecules the cells need. True or false
Answer:
True is the answer to this question
Answer:
true, because your body need something to break down molecules... and that the job of an enzyme, hope this helps :))
What does the diagram below best illustrate?
a.Ribosomes are found on the exterior of cells.
b.Genetic codes are used to form cell structures.
c.Fats are created by the ribosome to store excess energy.
d.Amino acids are the building blocks for creating proteins.
Which statement is true about energy transfer?
A. Warm water is denser than cold water.
B. Energy is created each time it is transferred.
C.Molecules move faster in warmer substances.
D.Radiation requires a medium to transfer energy.
Hi,
Answer:
B. Energy is created each time it is transferred.
C.Molecules move faster in warmer substances.
D.Radiation requires a medium to transfer energy.
all matter has both physical and chemical properties. a physical property can be observed without changing the identity of the substance. which of these choices is a physical property?
Where do you find the atomic symbol?
Answer:
On the periodic table? But if you are talking about atomic NUMBER-then thats the number of protons on the upper left side of the symbol , but if you are talking about the mass then on the bottom left.
Since you are in highschool it shall always be provided hence no need to memorize it, just know the first 20
The atomic symbol for elements can be found on the periodic table.
What is a periodic table?The elements in the periodic table are arranged according to their rising atomic number and recurrent chemical characteristics. They are arranged in a tabular format with rows representing periods and columns representing groups.
The sequence of the elements' ascending atomic numbers is left to right and top to bottom. Thus, The valence electron configuration of elements belonging to the same group will be the same, resulting in identical chemical characteristics.
In contrast, valence electrons in the same period will be arranged in ascending order. As a result, there are more energy sub-levels per energy level as the atom's energy level rises. The very first 94 elements of a periodic table are found naturally, whereas the last 95–118 elements have only been created artificially in labs or nuclear reactors.
The periodic table we currently use is a more advanced version of certain models proposed by scientists in the 19th and 20th centuries. Based on the discoveries of those scientists who came before him, like John Newlands and Antoine-Laurent de Lavoisier, Dimitri Mendeleev proposed the periodic table. The periodic table was created by Mendeleev, who is the only person to receive credit for it.
Therefore, the atomic symbol for the elements can be found on the periodic table
Read more about the periodic table, here
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been stuck on this question for more than 10 mins. can someone pls help i’m frustrated ♂️.
The average atomic mass : 15.86
Further explanationGiven
205 atoms = 16 amu⇒atom 1
15 atoms = 14 amu⇒atom 2
Required
The average atomic mass
Solution
Total atoms for element Z :
= 205 + 15
= 220 atoms
% atom 1 = 205/220 x 100% = 93.18%
% atom 2 = 15/220 x 100% = 6.82%
The average atomic mass :
= 93.18% x 16 amu + 6.82% x 14 amu
= 14.9088 + 0.9548
= 15.8636≈ 15.86( 4 sig fig)
Calculate the number of moles in 23.50 liters of dinitrogen monoxide gas at STP
Answer:
Explanation:
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Why do you think the presence of smoke contributed to cloud formation?
Answer:
since the moisture in the bottle from the water collects smoke particles which form into clouds
Explanation:
What is the specific heat capacity of propane in J/gC?
Answer:
At ambient pressure and temperature the isobaric specific heat, CP, of gaseous propane is 1.68 kJ/kg K or 0.402 Btu/lb °F = cal/g K, while the isochoric specific heat, CV, is 1.48 kJ/kg K or 0.353 Btu/lb °F = cal/g K.
Explanation:
Hope this helps
Which of the following does not represent the writing mechanics of an individual?
O Letter and word spacing
O Grammar
O Pen lifts and separation
O All of the above
Answer: A-Letter and word spacing is the best option.
tropical rainforest How are humans affecting this biome, directly and/or indirectly?
Answer:
Overexploitation: Human activity and development in the tropical rainforest has lead to massive amounts of forest land being converted into other human uses such as mining or agriculture. Overexploitation of the rain forests Natural resource is a highly damaging impact that humans have on the rainforest, massive amounts of trees are cut down in the rainforest which are used for the timber industry, this cutting down of the trees causes a massive drop in the habitat of the forest’s organisms and the machinery used to complete this process provide a massive source of pollution and habitat destruction. Approximately 80% of the rainforests nutrients comes from trees and plants. That leaves 20% of the nutrients in the soil. when trees are over exploited conditions change very quickly, the soil dries up and causes erosion. Poaching and hunting are a major issue in the tropical rainforest, exotic creatures are being over hunted causing their populations to go into the danger zones and on the verge of extinction. Furthermore, the rainforest is being used up at an exeptional rate for mining purposes: oil, gold and iron ore are being mined at a massive rate.
Explanation:
Match the vocabulary terms to their definitions.
1. mechanical energy
stored energy
2. mechanics
the sum of an objects's kinetic
energy and potential energy
the analysis of bodies in motion
3. kinetic energy
4. potential energy
energy of an object due to its
position above the earth
a push or a pull
5. gravitational potential energy
6. force
the energy of a moving object
Answer:
1. mechanical energy
The sum of an objects kinetic
energy and potential energy
2. mechanics
The analysis of bodies in motion
3. kinetic energy
The energy of a moving object
4. potential energy
Stored energy
5. gravitational potential energy
Energy of an object due to its
position above the earth
6. force
A push or a pull
Explanation:
Answer:
1. mechanical energy
The sum of an objects kinetic
energy and potential energy
2. mechanics
The analysis of bodies in motion
3. kinetic energy
The energy of a moving object
4. potential energy
Stored energy
5. gravitational potential energy
Energy of an object due to its
position above the earth
6. force
A push or a pull
Explanation:
What would be the mass of 9.65x1025 molecules of water
2890 g H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
9.65 × 10²⁵ molecules H₂O (water)
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 9.65 \cdot 10^{25} \ molecules \ H_2O(\frac{1 \ mol \ H_2O}{6.022 \cdot 10^{23} \ molecules \ H_2O})(\frac{18.02 \ g \ H_2O}{1 \ mol \ H_2O})[/tex]Divide/Multiply: [tex]\displaystyle 2887.63 \ g \ H_2O[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2887.63 g H₂O ≈ 2890 g H₂O
Determine the mass (in grams) of 8.02 x 1024 atoms of mercury (Hg).
2670 g Hg
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
8.02 × 10²⁴ atoms Hg
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Hg - 200.59 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 8.02 \cdot 10^{24} \ atoms \ Hg(\frac{1 \ mol \ Hg}{6.022 \cdot 10^{23} \ atoms \ Hg})(\frac{200.59 \ g \ Hg}{1 \ mol \ Hg})[/tex]Divide/Multiply: [tex]\displaystyle 2671.42 \ g \ Hg[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2671.42 g Hg ≈ 2670 g Hg
A population of monarch butterflies lives in California year-
round.
Which two statements best describe why this group of butterflies is
considered a population?
A. The butterflies all live in the same place.
B. The butterflies have the exact same genes
c. The butterflies are all the same species.
D. The butterflies all have the same parents.
Answer:
A and C
Explanation:
Just did the test
The butterflies all live in the same place and the butterflies are all the same species. Hence, options A and C are correct.
What is species?A species is often defined as a group of organisms that can reproduce naturally with one another and create fertile offspring.
The butterflies come down at night and gather in clusters. A cluster of butterflies is called a roost or a bivouac. Monarchs migrate alone. They do not travel in flocks the way many birds do.
Hence, options A and C are correct.
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