Answer:
I think 11 yeah.. try that
Explanation:
Please read the following direction I need it ASAP!!!
HIghschool Earth & Physical Science (9th Grade)
The correct answer about Liquids A and B is:
Liquid B has a lower boiling point because more water evaporated, therefore the interactions between the particles in Liquid B are weaker than the interactions in Liquid A; option D
What is the boiling point of a liquid?The boiling point of a liquid is the temperature at which the molecules of the liquid change phase from liquid to gas.
At the boiling point of a liquid, the molecules of the liquid acquire enough energy to break free of the intermolecular forces between the molecules.
The lower the boiling point of a liquid, the lesser the strength of the intermolecular forces between the molecules,
Hence liquids with lower boiling points evaporate faster.
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A rectangular piece of fabric with a length of 1.20 meters and a width of 0.85 meters must be divided into twelve, equal sized units for forensic sampling purposes. What are the dimensions of the twelve smaller portions?
The dimensions of the twelve smaller portions of the rectangular piece of fabric will be:
length = 0.1 mwidth = 0.85 mWhat will be the dimensions of the twelve smaller portions of the rectangular piece of fabric?The dimensions of the twelve smaller portions of the rectangular piece of fabric will be determined below as follows:
Dimension of the original piece of fabric is given as;
length = 1.20 meters and
width = 0.85 meters
The number of divisions of the fabric will be 12 equal parts
The multiples of 12 are 1, 2, 3, 4, 6, 12
Using the multiples to determine the dimensions of the twelve smaller portions:
12 and 1
Length = 1.2 / 12 = 0.1 m
width = 0.85 / 1 = 0.85 m
6 and 2
Length = 1.2 / 6 = 0.2 m
width = 0.85 / 2 = 0.425 m
4 and 3
Length = 1.2 / 4 = 0.3 m
width = 0.85 / 3 = 0.283 m
Therefore, the multiples 12 and 1 are the best match.
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why should we care if people in other parts of the world pollute their drinking water?
Answer: This may seem unlikely for whereever you're living but say if a drought happened in your country and water is very limited, then we'd have to import water from other countries but if their water is unclean then we also have a problem of no water. Most bottled water sold in stores comes from other countries aswell.
If an object that weighs 50 N displaces a volume of water that weighs 10 N,what is the buoyant force on the object?
10 N
Buoyant force is equal to the weight of the displaced fluid; acting in the upward direction.
Answer:We know that when a body is fully or partially submerged in a fluid,its weight is decreased and that amount of decrease is equals to the weight of the fluid displaced by it.
So,this apparent reduction of weight is due to the buoyancy force acting,which is equals to the weight of the fluid displaced by the body.
So,here the buoyancy force acting on the object is
10
N
Explanation:
water molecules slide around each other, making and breaking hydrogen bonds. as energy is added, the molecules move so rapidly that they fly off in all directions. this phase-change process is
Water molecules slide around each other, results in making and breaking of hydrogen bonds. As energy is added, molecules move rapidly that they spread in all directions. This phase-change process is called vaporization.
The temperature of liquid water increases as it is heated up until it reaches 100°C. Water that was in liquid state turns into vapors at this point. This transition of a liquid into a gas is referred to as Vaporization. The water molecules absorb heat energy. As a result, the particles move more quickly as they gain extra energy until they possess sufficient energy to break free of the liquid molecules to vapors. There are two types of vaporization. 1. Boiling that occurs below the surface of a liquid. The boiling point of a liquid is the temperature at which it begins to boil. Water has a boiling point of 100 °C. 2. Evaporation that take place at the surface of the liquid. Some of the molecules that move faster are able to overcome the forces of attraction of other molecules and escape from the water's surface.
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An important formula from chemistry is PV = nRT. Solve the formula for R.
The value of R from the ideal gas equation is 0.082 atm.L/K/mol.
What is the ideal gas equation?The ideal gas equation is the equation that shows the relationship between pressure, and volume. moles of a gas and the temperature of a gas under ideal conditions.
The ideal gas equation is given below as follows:
PV = nRT
At standard temperature and pressure, the values of the variables are given below;
Pressure, P = 1 atm
Volume, V = 22.4 Liters
Number of moles, n = 1 mole
Temperature, T = 273.15 K
R = PV/nT
R = 1 * 22.4 / (273.15 * 1)
R = 0.082 atm.L/K/mol
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The photo of a glass of water shows the most abundant substance of earths surface. Which fact about this substance tells you it is a compound
Water is the most abundant substance in earth. Water is a compound because it made of a number of H₂O molecules. Water is a homogeneous compound.
What is compounds?Compounds are substances formed by chemical bonding of two or more elements. All the molecules in the compounds will be identical. For example CO₂ where one carbon and two oxygens covalently bond together to form the compound.
Each compound is made of a number of molecules. Thus molecules are the basic units of compounds like we say as for atoms for every substances.
There are different types of compounds based on the type of bond and number of atoms etc namely ionic compounds, covalent compounds, coordination compounds etc.
Water contains two hydrogen atoms and one oxygen thus forms one molecule of water. Similar kinds of molecules joins together to form the compound.
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in the rate law the exponents associated with the concentration of each reactant are referred to as the order of the reaction with respect to that reactant. why are we not able to use the stoichiometric coefficients in the balanced equation for the orders in the rate law?
A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.
In a rate law, what do the exponents stand for?The rate equation's "orders," the exponents a and b, must be established empirically. The exponents are added to determine the reaction's overall order. In other words, the reaction is third order overall if a=1 and b=2.
By adding together the different orders, the reaction's overall order can be determined. For instance, the overall order is 2 if the reaction is first order with regard to both A and B (a = 1 and b = 1). This is referred to as a global second order response.
Finding a Rate Law's Exponents from Initial Rates (Experimental Data)
The concentrations of all the species for which data are provided should be included in the rate law. ...Consider the experimental data's ratios for the various rates.Delete common phrases, then find the exponent that doesn't disappear.The molar concentrations of the reactants are used by the rate law to calculate the reaction rate. Because there are more molecules colliding and reacting with one another, reactions often proceed more quickly at higher reactant concentrations.
The exponents of a rate law's concentration terms are added to determine its order. The rate law of a reaction can be utilized to better understand the makeup of the reaction mixture once it has been established.
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Determine the valence of elements in substances: SiH4 CrO3 H2S CO SO3 SO2 Fe2O3 FeO HCI HBr Cl2O5 Cl2O7 PH3 K2O Al2O3 P2O5 NO2 N2O5 Cr2O3 SiO2 B2O3 SiH4 Mn2O7 MnO CuO N2O3
Answer:
see the explanation
Explanation:
1. IV
2. VI
3. II
4. IV
5. II
6. VI
7. IV
8. III
9. II
10. I
11. I
12. V
13. VII
14. III
15. I
16. III
17. V
18. IV
19. V
20. III
21. IV
22. III
23. IV
24. VII
25. II
26. II
27. III
Enzyme A is currently functioning at a temperature of 55 and a pH of 7. According to the information provided in the chart, select all factors that would increase the rate of function of enzyme A?
A
Increase the temperature to 70∘^{\circ}
B
Increase the pH with the addition of a base
C
Decrease the temperature to 40∘C
D
Decrease the pH with the addition of an acid
The factor that will increase the rate of the function of the enzyme A is increasing the temperature to 70°C (option A).
What is an enzyme?Enzymes are biological catalysts meaning that they regulate the rate of biochemical reactions in living cells.
Enzymes lower the activation energy of a reaction, which is the required amount of energy needed for a reaction to occur. Enzymes do this by binding to a substrate and holding it in a way that allows the reaction to happen more efficiently.
The factors that affect the rate of function of na enzyme are as follows:
TemperaturepHSubstrate concentrationEnzyme concentrationEach enzyme has an optimum pH range. This means that changing the pH outside of this range will slow enzyme activity, however, raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction.
Therefore, the increase of temperature will increase the rate of function of the enzyme A.
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List three specific examples of a physical change.
Answer:
Cutting hair is a physical change since it doesn't change the substance its still hair
bending a paper clips since it's also the same substance
Ice cube melting
Explanation:
All of these are physical change since there reversible and they all still stay the same substance
a compound is analyzed and found to contain 12.1% carbon, 16.2% oxygen, and 71.7% chlorine (by mass). calculate the empirical formula of this compound.
Answer:
COCl2 Phosgene
Explanation:
n the laboratory you dilute 4.49 ml of a concentrated 12.0 m nitric acid solution to a total volume of 150 ml. what is the concentration of the dilute solution?
The concentration of the dilute solution is 0.3592 M.
Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.
If the concentrated nitric acid solution is 12.0 M, then there are 12.0 moles nitric acid per liter of solution.
For a 4.49 ml of a concentrated 12.0 M nitric acid solution, the number of moles is 0.05388.
M = moles of solute / volume of solution
moles = 12.0 M(4.49 ml)(1 L / 1000 ml)
moles = 0.05388 moles nitric acid
If the total volume is 150 ml, then the concentration of the diluted solution is
M = moles of solute / volume of solution
M = 0.05388 moles nitric acid / 150 mL (1 L / 1000 ml)
M = 0.3592
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8CO + 17H2 → C8H18 + 8H2O
In this chemical reaction, how many grams of H2 will react completely with 6.50 moles of CO? Express your answer to three significant figures.
___ grams of H2 will react completely.
((27.6 IS NOT THE CORRECT ANSWER!!!!!)
Answer:
I don't know why 27.6 g is not the correct answer. I believe that it is correct.
27.6 grams of [tex]H_{2}[/tex].
Explanation:
The balanced equation tells us that 17 moles of hydrogen will react completely with 8 moles of carbon monoxide. That is a molar ratio of 17/8 moles H2/molesCO.
If we start with 6.5 moles of CO, we need:
(6.5 moles CO)*(17/8 moles H2/moles CO) = 13.8 moles of H2 (3 sig figs)
Convert 13.8 moles of H2 into grams H2 by multiplying by the molar mass iof H2 (2g/mole):
(13.8 moles H2)*(2 g H2/mole H2) = 27.6 grams of [tex]H_{2}[/tex].
The mass of an atom of chlorine-37 is _______ than the mass of an atom of chlorine-35
The mass of an atom of chlorine 37 is heavier than the mass of an atom of chlorine 35.
Mass number of atomsThe mass number of atoms is the sum of the protons and neutrons in the nuclei of atoms.
Mathematically:
Mass number = number of protons + number of neutrons
The protons are the positively charged particles located in the nuclei of atoms while the neutrons are neutrally charged particles found in the nuclei of atoms as well.
Both proton and neutron numbers determine how heavy an atom would be. Electrons of atoms are usually located outside the nuclei and contribute a negligible amount to the weight of atoms.
Thus, a chlorine atom with an atomic mass of 37 is heavier than a chlorine atom with a mass of 35.
Although both atoms are from the same elements, they are called isotopes. Isotopes of the same element have the same proton number but different mass numbers.
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The Conduction and Convection Gizmo shows two flasks of colored water, one blue and one yellow. Select Copper and Solid chunk from the dropdown lists. (This means the two flasks are separated by a solid piece of copper, and the two liquids cannot touch each other.)
Use the sliders to make What happens?
The Conduction and Convection Gizmo shows two flasks of colored water, one blue and one yellow. Select Copper and Solid chunk from the dropdown lists his means the two flasks are separated by a solid piece of copper, and the two liquids cannot touch each other then temprature tries to become the even/leveled
Conduction is the process to transfer heat from one substances to another by direct contact and convention means a rise and sink due to temprature and density differences this is called convention and when two flasks are separated by a solid piece of copper, and the two liquids cannot touch each other then to use the sliders to make one flask hotter than other and the temprature tries to become the even/leveled
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How can photochemical smog impact the environment? PLS HURRY ASAP
It can increase the number of insects in the area.
It can reduce the amount of plastic in the ocean.
It can increase tree and plant growth in a city.
It can decrease the crop yield in a region
Photochemical smog effects largely the growth of plants by interfering in nitrogen cycle and by causing atmospheric pollution.Thus option D is correct.
What is photochemical smog?Photochemical smog is a brown haze in the atmosphere formed by the burning of fuels and from naturally released pollutants when exposed to UV radiation undergo a series of hydrocarbon reactions to produce photochemical smog.
The main composition of photochemical smog is oxides of nitrogen and it further undergo further reaction with hydrocarbons entered into he atmosphere by burning fuels produce secondary pollutants.
These secondary pollutants again creates air pollution and serious other issues such as reduction in plant growth because they interfere the atmospheric nitrogen cycle which is essential for crop yield.
Hence, photochemical smog can decrease the crop yield in a region and option D is correct.
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When you put aspirated spinach leaf disks in a beaker of sodium bicarbonate and place them in different colors of light, some disks float faster & more abundantly than others dependent on what color, if any, they were in. What made them able to float?.
The release of O₂( oxygen) from the process of photosynthesis is what made them to be able to float.
What is Photosynthesis?This is referred to as the process in which green plants manufacture their food in the presence of sunlight which is trapped by chlorophyll.They are known as primary producers and they use compounds such as water and carbondioxide.
The reactants mentioned above undergo series of reactions which leads to the production of glucose and oxygen is given off as a result which is the element responsible for the floating of the aspirated spinach leaf disks in this scenario.
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What Is the ionic equation for 4HCl (aq) + MnO₂ (s) -> MnCl₂ (aq) + 2H₂O (l) + Cl₂ (g)?
Answer:
Explanation:
answer is below
The _______ the number of theoretical plates, the _______ the separation of a mixture of two liquids.
The N=(tR/σ)2 the number of theoretical plates, the distillation the separation of a mixture of two liquids.
Is more theoretical plates better?The effectiveness of a column is frequently determined using the number of theoretical plates. The range of plate numbers is 100 to 106. The quality of the separation improves with the number of theoretical plates present in a column because more equilibrations between the stationary and mobile phases are possible.
Why are theoretical plates important?The effectiveness of a column's column is closely tied to theoretical plates in column chromatography. It can therefore help to increase resolution, which, when all other factors are held constant, is directly proportional to the square root of the number of theoretical plates.
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does a 700 nm photon have more or less energy than a 400 nm photon? more less correct: your answer is correct. by what factor more (or less)? enter your answer as e700 nm e400 nm . e700 nm e400 nm
It is the 400 nm photon that has the greater energy by a factor of 1.77.
What is the wavelength?We know that the wavelength has to do with the horizontal distance that is covered by a wave. We know that the longer the distance that is covered then the weaker the wave. In other words, the wavelength of the wave is inversely proportional to the to the energy of the wave. The greater the wavelength, the lesser the energy.
Let us now find the energy of each of the wavelengths;
E = hc/λ
E = energy of the light
h = Plank's constant
c = speed of light
λ = wavelength
For the 700 nm photon;
E = 6.6 * 10^-34 * 3 * 10^8/ 700 * 10^-9
E = 2.8 * 10^-19 J
For the 400 nm photon;
E = 6.6 * 10^-34 * 3 * 10^8/ 400 * 10^-9
E= 4.95 * 10^-19 J
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When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond.
When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond nitrogen lone bond.
Lone pairs do they produce hydrogen bonds?Strong intermolecular interactions known as hydrogen bonds can develop between adjacent molecules. Between the covalently bound hydrogen atom of one molecule and the electron lone pair of a second molecule, hydrogen bonds are created.
Due to their strong electronegativity, only nitrogen, oxygen, or fluorine atoms may be used in this process. These three atoms have extremely high electronegativity, which makes it simple for them to draw the electron from the hydrogen atom and establish hydrogen bonds.
Atoms within a molecule are held together by intramolecular forces. There are forces between molecules known as intermolecular forces.
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help pls !
The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one third of its original pressure and its absolute temperature is decreased by one half. What is the final volume of the gas?
The final volume of the gas is 9L
Volume is the space occupied within the boundaries of an object in three dimensional space
P, V and T is the initial pressure volume and temperature of the ideal gas respectivelyX be the final volume of ideal gasIdeal gas equation establishes a relation between pressures, volumes, and temperatures of different conditions
Using the ideal gas equation
PV = nRT .....1
Ideal gas equation for initial condition will be:
PV = nRT......2
Ideal-Gas Equation for final conditions will be:
(P/3)X = nR(T/2)
On dividing equation 1 and 2
PV = nRT / (P/3)X = nR(T/2)
3V/X = 2
X = 3V/2
Putting the value of V = 6L
X = 3(6L)/2 = 9L
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a student separated the three compounds below using the acid base extraction procedure. he then followed is experiment with tlc using acetone hexanes mixture as mobile phase. what would you expect the student to see on tlc? would he run into difficulty with the tlc? explain
The student used an acid-base extraction method to isolate three compounds. In this lab, students will use solvents of different polarity (mobile phases) to determine the optimal separation of the pigments found in spinach extracts.
Mixtures are physical mixtures or additional materials that retain their inherent properties and come together in the form of a reaction, suspension, or colloid. Combinations are materials made from materials or other uniquely styled materials. It can be separated using physical methods. Examples include solutions of salt and water, mixtures of sugar and water, various gases, and air.
The mixture consists of one or more pure materials with different compositions. There are heterogeneous and homogeneous types of mixtures. Dissimilar combinations have visually distinguishable additives, while homogeneous combinations appear uniform throughout. Agglomerates are created by the mixing of two or more distinct substances in the body and can be separated from below into their original substances. A chemical reaction occurs when additional substances combine to form a completely new substance and cannot be separated back into the original substance.
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when making soap, if 890 g of a specific fat react completely with 120 g of sodium hydroxide, the product formed are soap and 92 g of glycerin. calculate the mass of soap formed to satisfy the law of conservation of mass.
The mass of soap formed to satisfy the law of conservation of mass is 918g.
What is law of conservation of mass?According to the rule of conservation of mass, in a chemical process, mass neither creates nor destroys itself. When coal is burned, for instance, the carbon atom in it transforms into carbon dioxide. Although the carbon atom's shape changes from solid to gas, its mass remains constant.
The mass of the reactants and products in a chemical reaction must equal each other according to the law of conservation of mass.
Fat + sodium hydroxide = soap + glycerin
890+ 120 = soap + 92
1010 = soap + 92
soap = 1010 - 92
soap = 918g.
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an open flask sitting in a lab refrigerator looks empty, but it is actually filled with a mixture of gases called air. if the flask volume is 4.50 l, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?
At standard temperature and pressure, the number of gaseous molecules that the flask contains is equal to 1.2098 × 10^23.
According to the given data, the volume of the flask is equal to 4.50 L.
As the volume occupied by one mole of any gas at standard temperature and pressure is 22.4 liters, therefore the number of moles in the flask can be calculated as follows;
n = 4.5 ÷ 22.4
n = 0.2009
As one mole is equal to 6.02 × 10^23 units
The number of gaseous molecules in the flask can be calculated as follows;
0.2009 × ( 6.02 × 10^23 ) = 1.2098 × 10^23
Hence, the number of gaseous molecules in the flask is calculated to be 1.2098 × 10^23.
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The conversion of solar energy into the chemical energy of a carbohydrate occurs during the process of.
The conversion of solar energy into the chemical energy of a carbohydrate occurs during the process of photosynthesis.
Certain organisms convert solar energy (sunlight) into chemical energy through photosynthesis, which is then used to construct carbohydrate molecules. When an organism breaks down food, the energy that was used to keep these molecules together is released.
The energy generated by photosynthesis continuously enters the planet's ecosystems and is transferred from one organism to another. As a result, the majority of the energy that all living things on Earth require comes from the process of photosynthesis, either directly or indirectly.
Oxygen is also released into the atmosphere as a result of photosynthesis. To summarize, humans rely almost entirely on photosynthesis-producing organisms for food and oxygen.
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When a mycelium infiltrates an unexploited source of dead organic matter, what are most likely to appear within the food source soon thereafter?.
When a mycelium infiltrates an unexploited source of dead organic matter, Fungal digestive enzymes are most likely to appear within the food source soon thereafter.
A network of hyphae with fungal filaments is called mycelium. Although they can thrive in various habitats, such as rotting tree trunks, mycelia frequently grow underground. Mycelium can be produced by a single spore. Many fungi, including mushrooms, grow their fruiting bodies from mycelium. Mycelia are crucial to the health of the soil. They decompose organic matter, returning essential elements to the ecosystem as a result.
Fungal enzymes are active in an acidic environment that mimics the physiology of the human stomach. In vitro, fungi enzymes enhance the digestion of dietary fat, protein, and carbohydrates. The research of digestive deterioration with aging has been established using an adapted in vitro technique.
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In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O A. Combustion and expansion
O B. Compression and ignition
O C. Exhaust
O D. Air and fuel intake
Answer:
Explanation:
In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?
O C. Exhaust
in the laboratory, a student dilutes 12.4 ml of a 10.1 m hydrochloric acid solution to a total volume of 125.0 ml. what is the concentration of the diluted solution? concentration
The concentration on diluting the solution by student is 1 M.
The concentration and volume are related to each other as - [tex] M_{1}[/tex] [tex] V_{1}[/tex] = [tex] M_{2}[/tex] [tex] V_{2}[/tex], where [tex] M_{1}[/tex] and [tex] M_{2}[/tex] are initial and final molarity and [tex] V_{1}[/tex] and [tex] V_{2}[/tex] are initial and final volume.
[tex] M_{1}[/tex] is 10.1 M, [tex] V_{1}[/tex] is 12.4 milliliters, [tex] M_{2}[/tex] is to be calculated and [tex] V_{2}[/tex] is 125 milliliters.
Keep the values in formula to find the value of [tex] M_{2}[/tex].
10.1×12.4 = [tex] M_{2}[/tex]×125
[tex] M_{2}[/tex] = 125.24 ÷ 125
Performing division on Right Hand Side of the equation
[tex] M_{2}[/tex] = 1.00192 M or 1 M.
Thus, the concentration of diluted solution is 1 M.
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