Katja plans an experiment that measures the temperature of different colors of paper placed in sunlight. Her hypothesis is that if black, blue, yellow, red, and white sheets of paper are exposed to white light, then the black sheet of paper will increase the most in temperature. Katja will place a sheet of each color of paper of the same size and thickness in the same location for the same amount of time. Why will katja use different colors of paper in her experiment?

Answer:

I think the answer could be 13 i hope this helps

Answer:

hope it helps..

Explanation:

The troposphere forms the lowest level of the Earth's atmosphere, extending down to the surface of the Earth. This layer also features the heaviest weight of all Earth atmosphere layers, comprising approximately 75 percent of the total atmospheric weight. The troposphere varies in thickness and height around the world.

The enthalpy change when 5 g of zinc metal is heated from 100oc to the point where the entire sample is melted having the heat of fusion for zinc is 112.4 j/g and its specific heat capacity is 0.388 is 581.4 J.

specific heat capacity is 0.388 j-1c-1 .

The specific heat capacity can be defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K.  

The heat of fusion for zinc is 112.4 j-1.

The expression for Heat energy is,

             = mcΔT+mL

where, m = mass of water

c = specific heat capacity of water

L = specific latent heat of fusion of ice

ΔT = change in temperature

Heat energy can be explained as a result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. It can be transferred from one object to another. The transfer or flow of heat energy due to the difference in temperature between the two objects is called heat.

Putting all the values in the expression of heat energy, we get,

  = 0.5 g * 0.388 * 100 + 5 * 112.4

  = 19.4 + 562

   = 581.4 J

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The correct designation for the stereocenter carbon atom in the molecule is s configuration.

The correct designation for the stereocenter carbon atom in the molecule is s configuration. A central carbon has a dashed bond pointing up to a methyl group, a wedged bond pointing to the right to an aldehyde, a dashed bond pointing down to a hydroxy group and a wedged bond pointing to the left to a hydrogen. The stereochemistry of it is s configuration and it is pointing in upward direction. The stereo center of carbon atom rotates in two ways and its dash pointing in upward direction and wedge pointing in downward direction.

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Answer:

5

Explanation:

An ion has a net charge of 3+

ion has 8 protons

How many electrons does it have

A neutral atom has equal number of electrons and protons.

If a neutral atom loses electron it acquires a positive charge.

So to acquire 3+ charge the atom must have lost three electrons.

So the number of protons exceeds the number of electrons by 3.

Answer:

10

Explanation:

Khan Academy

Answer:

The Sun, like others stars, is a ball of gas. In terms of the number of atoms, it is made of 91.0% hydrogen and 8.9% helium. By mass, the Sun is about 70.6% hydrogen and 27.4% helium.

Explanation:

helium is probs ur answer!

we can use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and number of moles (n) of a gas. There are 2.32 moles of gas in the sample.

How to calculate no. of moles in the given sample?

To find the number of moles of gas in the sample, we can use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and number of moles (n) of a gas:

PV = nRT

where R is the gas constant. We can rearrange this equation to solve for n:

n = PV/RT

where P is the pressure in atmospheres, V is the volume in liters, T is the temperature in Kelvin, and R is the gas constant (0.08206 L atm/(mol K)).

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15:

T = 133 C + 273.15 = 406.15 K

Then, we can plug in the given values:

n = (6.9 atm)(25.1 L)/(0.08206 L atm/(mol K))(406.15 K)

n = 2.32 moles

Therefore, there are 2.32 moles of gas in the sample.

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The molarity of the new solution if 0.50 litre of 2.0 M HCl is diluted with water to a volume of 1.0 litre is 1.0 M.

To solve this problem, the formula for molarity can be used.

Molarity = moles of solute/litres of solutionIn this case, the initial solution of HCl has a volume of 0.50 litres and a concentration of 2.0 M. Thus, the number of moles of HCl in the initial solution is: moles of HCl = concentration × volume = 2.0 M × 0.50 L = 1.0 molThe final volume of the solution is 1.0 L, therefore the new molarity of the solution can be calculated as Molarity = moles of solute/litres of solution = 1.0 mol / 1.0 L = 1.0 MTherefore, the molarity of the new solution is 1.0 M.

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Answer:1.0m

Explanation:

It’s A) (0.1978)(10.01) + (0.8022)(11.01)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore option A is correct option.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mathematically,

average atomic mass=  ∑(relative abundance x mass of isotope)

average atomic mass boron= (relative abundance boron-10  x mass of isotope boron-10)+(relative abundance boron-11  x mass of isotope boron-11 )

average atomic mass boron=(0.1978)(10.01) + (0.8022)(11.01)

Therefore option A is correct option.

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Chemical substances known as oxygenates have oxygen as one of their constituent parts. Tech B is correct

Although technically any substance containing oxygen qualifies as an oxygenate, the term is most frequently used to refer to substances added to internal combustion engine vehicles.

Oxygenate fuel additives are either alcohols, like ethanol, or ethers, with methyl tertiary butyl ether, or MTBE, being the most often used. Any chemical compound that has at least one hydroxyl group, which is made up of oxygen and hydrogen and is connected to the carbon atom in an alkyl group, is referred to as alcohol. Alkyl groups are made up of hydrogen and carbon atom chains.

Alcohols are a crucial group in organic chemistry despite their lack of chemical specificity because of how many different compounds they can originate from and be transformed into.

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When the puck is dropped, the potential energy will be transformed into kinetic energy.

Potential energy is the energy stored by an object as a result of its position or configuration. It is the energy that is stored in an object due to its position with respect to its surroundings. Potential energy is an important concept in the study of energy since it is related to kinetic energy.

                            When an object is lifted to a certain height above the ground, it has potential energy. The potential energy of an object can be calculated using the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height above the ground.

                             Potential energy is measured in joules.When the puck is dropped, it loses its potential energy and gains kinetic energy. The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the energy that is required to accelerate an object of a given mass to a given velocity.

The kinetic energy of an object can be calculated using the formula KE = 1/2mv², where m is the mass of the object and v is its velocity. Kinetic energy is also measured in joules.

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Answer:

a) 3.969

b) 3.487

Explanation:

Given data:

m =  0.27 M

pH = 8.7

a) Calculate PKa of acid HA

pH value = 1/2 ( Pkw + Pka + log C )

    8.7 * 2 = 14 + log C + Pka

        17.4 = 14 + log ( 0.27 ) + Pka

∴Pka = 17.4 - 14.5686 = 3.9686 ≈ 3.969

b) Calculate the pH of solution

pH = pKa + log ( salt / acid )

     = 3.9686 + log ( 0.1 / 0.3 )

     = 3.487

Approximately 2 half-lives have passed since the rock formed.

Based on the information provided, the rock contains 8 parent atoms and 24 daughter atoms. To determine the number of half-lives that have passed since the rock formed, we can use the formula:

N = N0 * (1/2)^n

Where N is the current number of parent atoms (8), N0 is the initial number of parent atoms, and n is the number of half-lives.

Since there are 24 daughter atoms and 8 parent atoms, the initial number of parent atoms (N0) is 8 + 24 = 32. Now we can solve for n:

8 = 32 * (1/2)^n

Dividing both sides by 32:

1/4 = (1/2)^n

Since (1/2)² = 1/4, the number of half-lives (n) that have passed is 2.

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Answer:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

Explanation:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

Answer:

The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.

change 25 grams of potassium chlorate to moles.

calculate the gram molecular mass of potassium chlorate.

Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.

1 K x 39 grams/mole

+1 Cl x 35.4 grams/ mole

+3 O x 16 grams/ mole

= 122.4 grams / mole Potassium Chlorate

25

122.4

= moles.

2.05 moles of Potassium Chlorate.

There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.

2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.

Find the gram molecular mass of Potassium Chloride.

1 K x 39 = 39

+1 Cl x 35.4 = 35.4

= 74.4 grams / mole.

2.05 moles x 74.4 grams/ mole = 15.2 grams

Explanation:

big brain ;)

Answer:

D. Cs, Na, K

Explanation:

Elements in the same column of the Periodic Table have similar chemical properties.

Answer:

d) Cs, Na, K

Explanation:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.  Cs, Na, and K are all in the same vertical column (which is called Group IA or the alkali metals).

Explanation:

It should be decreasing, and the potential energy increasing, since Law of Conversation of Energy, right?

Also, if you think about what happens when it goes down, it loses potential and gains kinetic, so maybe the opposite should happen when it goes up.

Answer:

it's decreasing

Explanation:

as you know a roller coaster loses speed as it ascends and the kinetic energy is proportional to the speed according to it's formula

KE=(mv^2)/2

where m is the mass and v is the speed

ANSWER

The number of moles of Pb(SO4)2 is 1.5 moles

EXPLANATION

Given that;

The mass of Li2SO4 is 330g

Follow the steps below to find the moles of Pb(SO4)2

Step 1; Write the balanced equation of the reaction

Step 2; Find the number of moles of Li2SO4 using the below formula

Recall, that the molar mass of Li2SO4 is 109.94 g/mol

The number of moles of Li2SO4 is 3.00 moles

Step 3; Find the number of moles of Pb(SO4)2 using a stoichiometry ratio

In the above equation of the reaction, 1 mole Pb(SO4)2 reacts to give 2 moles LiSO4

Let the number of moles of Pb(SO4) be x

Therefore, the number of moles of Pb(SO4)2 is 1.5 moles

Glycerol and three fatty acids react via condensation to produce a triglyceride.

Triglycerides, also known as triacylglycerols, are a type of lipid or fat that are commonly found in foods and stored in the body. They are composed of three fatty acids that are linked to a glycerol molecule through ester bonds.

The process of forming a triglyceride is called esterification or condensation reaction, which involves the removal of a water molecule between the carboxyl group of the fatty acid and the hydroxyl group of the glycerol molecule. This process is catalyzed by enzymes called lipases and occurs in both plants and animals.

The three fatty acids that make up a triglyceride can vary in length, degree of saturation, and location of double bonds, which affects the properties and function of the triglyceride. For example, saturated fatty acids tend to be solid at room temperature and are commonly found in animal fats, while unsaturated fatty acids tend to be liquid at room temperature and are commonly found in plant oils.

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When one mole of Na3PO4.3H2O is heated extensively, three moles of water are released.

The water molecules in Na3PO4.3H2O are called molecules of water of crystallization. These molecules are not covalently bonded to the Na3PO4 molecule. They are only loosely attached to the substance.

Strong heating will drive away these molecules of water of crystallization to give three moles of water in the product.

Hence, when one mole of Na3PO4.3H2O is heated extensively, three moles of water are released.

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The arrangements of the molecules of a solid, liquid and gas  as follows

1. Solid: In this state of matter, the particles are closely bonded to each other. This means that they are closely packed in a system and the arrangement is regular. The intermolecular space between the particles is minimum.

2. Liquid: In this state of matter, the particles are not so closely packed. The arrangement between the particles is not regular. The intermolecular spacing between the particles is more than solid but less than gaseous state.

3. Gases: In this state of matter, the particles are very far away from each other and the arrangement is not regular. The intermolecular spacing between the particles is very much in case of gases.

The solid, liquid, and gaseous phases of matter are the three basic states of matter.

Every item we encounter every day—from ice cream to chairs to water is composed of matter. Based on intermolecular forces and the arrangement of the particles, matter can be divided into distinct states such as solid, liquid, and gas. By altering specific environmental variables, these three types of matter can change their state of matter (increasing or decreasing pressure and temperature, for instance). For instance, raising the temperature will cause ice to melt from a solid state.

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In Linear molecular geometry, the bond angle is 90°, in trigonal pyramidal geometry, bond angle is 107°, in trigonal planar geometry, bond angle is 120° and in tetrahedral, the bond angle is 109.5°.

In the linear geometry, the central atom has two side atoms attached which are at and bond angle of 180°.

In trigonal pyramidal geometry, the central atom has four side atoms which resembles a pyramid like structure. The bond angle between the two consecutive side atoms is 107°.

In trigonal planar geometry, three atoms are attached on the sides of central atom. The bond angle between these side atom is equal and of 120°.

In Tetrahedral geometry, the central atom and the side atoms makes a triangular prism like structure, the bond angle between side atoms is 109.5°.

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Answer:

phosphorous- 5

calcium- 2

nitrogen- 3 or 5

iron- 8 (transition metals use subshells as valence electrons)

argon- 8

potassium- 1

helium- 2

magnesium- 2

sulfur- 6

lithium- 1

iodine- 7

oxygen- 6

barium- 2

aluminum- 3

hydrogen- 1

xenon- 8

copper- 1

Source: my own chemistry notes

Answer:

WEATHER!

Explanation:

Weather can cause an unexpected temperature change! :) Hope this helps!

Answer:

B

Explanation:

The rate constant is equal to forward rate divided by reverse rate.

K = f/r

-> r = f/K

0.62/0.75 = 0.8267

Answer:

its B

Explanation:

I TOOK THE TEST

Answer:

The name of the reaction was coined after Alexander William Williamson developed it in 1850.Williamson Ether Synthesis is a reaction that uses deprotonated alcohol and an organohalide to form an ether. 1. Williamson Ether Synthesis usually takes place as an SN2 reaction of a primary alkyl halide with an alkoxide ion.

Explanation:

yeah