Which statement describes effusion?
It occurs when a gas passes through a tiny hole.
It occurs when a liquid passes through a tiny hole.
It occurs when gas molecules disperse throughout a container.
It occurs when a liquid disperses throughout a container.

Answer:

Coal is primarily used as fuel to generate electric power in the United States.

Explanation:

Answer:

20.4 miles.

Explanation:

We know he usually rides his bike at 15mph, and if we subtract 3 from that we get 12 miles per hour. Now if we multiply by the amount of time (1.7 hours) we'll find our answer. 12 x 1.7 = 20.4

Answer:

20.4

Explanation:

I just had the question.

Answer:

8

Explanation:

The number of moles of  Al₂ O₃ : 0.2

The reaction equation is the chemical formula of reagents and product substances  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products  

Reaction

2Al(s) + 3FeO(s) ⇒ 3Fe(s) + Al₂ O₃(s)

0.6 mol of Fe = 0.6 mol of FeO

mol of Al₂ O₃ :  mol of FeO = 1 : 3

[tex]\tt \dfrac{1}{3}\times 0.6=0.2[/tex]

Answer:

A test variable is a user-defined, name-value pair that stores and refers to information throughout a test and between tests. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores, since that is what is being measured...

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do. For example, The control group is used in an experiment as a way to ensure that your experiment actually works. Your experimental group would be given the Gatorade and your control group would be given regular water. The conditions must be exactly the same for all members of the experiment.

A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources. Limiting factors are usually expressed as a lack of a particular resource.

Infectious agents commonly spread through the direct transfer of bacteria, viruses, or other germs from one person to another. This can happen when an individual with the bacterium or virus touches, kisses, or coughs or sneezes on someone who isn't infected.

Explanation:

Answer:

Energy

Explanation:

Nuclear fusion is the process of combining atoms to make heavier atoms. This releases a huge amount of energy and it is what stars like our sun use to create energy.

Answer:

The temperature of the gas is 876.69 Kelvin

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.

In this case:

Replacing:

470 mmHg*0.570 L= 0.0049 moles* 62.36367 [tex]\frac{mmHg*L}{mol*K}[/tex] *T

Solving:

[tex]T=\frac{470 mmHg*0.570 L}{0.0049 moles* 62.36367\frac{mmHg*L}{mol*K} }[/tex]

T= 876.69 K

The temperature of the gas is 876.69 Kelvin

Answer:

56500J

Explanation:

Given parameters:

Mass of water  = 25g  = 0.025kg

Temperature of the water  = 100°C

Unknown:

Amount of heat required to vaporize the water  = ?

Solution:

The amount of heat required to vaporize the water is a function of the mass of the water and the latent heat of vaporization of water.

         H = mL

H is the amount of heat

m is the mass

L is the latent heat of vaporization of water = 22.6 x 10⁵J/Kg

  H  = 0.025 x 22.6 x 10⁵ = 56500J

Answer:

If you heat a gas you give the molecules more energy so they move faster.

Explanation:

Answer:

sulfuric acid ..............

Answer:

10.98 s

Explanation:

To solve this problem we first use the formula:

Where:

And solve for N:

Then we use the formula:

Where:

And solve for W₀.₅:

Answer:

The correct answer is 0.11 L

Explanation:

From the problem, we have the following data:

moles CaCl₂= 0.039 mol

molarity = 0.340 M = 0.340 mol CaCl₂/L

According to this, the solution has 0.340 mol of CaCl₂ in 1 L. If the total number of moles is 0.0369, we can find the volume as follows:

V= moles/molarity = 0.0369 mol x 1 L/0.340 mol = 0.108 L ≅ 0.11 L

Answer:

I think it would be b

Explanation:

Answer:

like a circle

Answer:

it would look white and its a circle

Explanation:

pLEASE MARK BRAINLIEST

Grams of acetic acid in 500 ml vinegar=39.744 g

Titration (equivalence point⇒mol acid(CH₃COOH)=mol base(NaOH))

M₁V₁n₁=M₂V₂n₂(n=valence acid/base, for CH₃COOH and NaOH=1)

[tex]\tt M_1\times 2.5\times 1=0.0960\times 34.5\times 1\\\\M_1(acetic~acid)=1.3248~mol/L[/tex]

For MW CH₃COOH = 60 g/mol, mass of acetic acid in 1 L :

[tex]\tt 1.3428~mol/L\times 60~g/mol=79.488~g/L[/tex]

for 500 ml :

[tex]\tt 79.488\times 0.5~L=39.744~g[/tex]

The mass of vinegar present in 500mL of solution is 39.6 g.

Concentration of acid (CA) = ?

Volume of acid(VA) = 2.50 ml

Concentration of base (CB) =0.0960 M

Volume of base (VB) =  34.50 ml

Number of moles of acid = 1

Number of moles of base = 1

Equation of the reaction;

CH3COOH (aq) + NaOH(aq) ------> CH3COONa(aq) + H2O(l)

From CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CA = CBVBNA/VANB

CA = 0.0960 × 34.50 × 1/2.50 × 1

CA = 1.32 M

Number of moles = concentration  × volume

Number of moles = 1.32 M × 500/1000

Number of moles = 0.66 moles

Number of moles = mass/molar mass

Mass = Number of moles  × molar mass

Molar mass of acetic acid = 60 g/mol

Mass =  0.66 moles  ×  60 g/mol

Mass = 39.6 g

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Answer:

0, 1, 2, 3

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define quantum number

Principal Energy Level n = 4

Step 2: Define ℓ

ℓ is the Angular Momentum. Its values start at 0, 1, 2, 3...

It is the Principal Energy Level n minus 1 (n - 1).

Step 3: Find

n = 4

ℓ = 4 - 1 = 3

Therefore, out angular momentum values can be 0, 1, 2, 3. These correlate to s, p, d, f sublevels.

Answer:

New temperature t2 = [1.28T− 273.15]° C

Explanation:

Given:

Volume v1 = 25 gram

New volume v2 = 25 + 7 = 32 gram

Constant pressure = p

Temperature t1 = T

Find:

New temperature t2

Computation:

Pv1/t1 = Pv2/t2

25 / T = 32 / t2

t2 = 1.28T

New temperature t2 = [1.28T− 273.15]° C

The atmospheric conditions at a particular time.

i did the test.

Answer:

the atmospheric conditions at a particulur time

Explanation:

Answer:

copper nitrate

Explanation:

copper nitrate

Answer:

Copper (ll) nitrate or C

Explanation:

Answer:

the answer is C acid dissolving limestone

Explanation:

Answer:

the answer is C acid dissolving limestone

Explanation:

The chemicals in the water break down the rocks, so water breaking rocks is an example of chemical weathering :) Also, acids are a form of chemical weathering, as the chemicals dissolve the limestone :) Hope this helped!!

Ionic compounds have higher melting point than covalent compounds.

Carbon dioxide have lower melting point (-56.6 °C) among the given compounds.

Melting point is the temperature at which the substance melts into liquid thus at this temperature its solid state and liquid state are in equilibrium. Melting point is depend upon the bond type and mass of the compound.

Ionic bonds are stronger than covalent bonds and hence ionic compounds have higher melting point than covalent compounds. Hence, lithium chloride and calcium bromide have higher melting point.

Silicon is bigger than carbon thus silicon dioxide melts at higher temperature.  Carbon dioxide is purely covalent and melts at negative temperatures.

Hence, the compound with lower melting point here is carbon dioxide thus, option A is correct.

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Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option A,C.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Therefore the correct option are option A,C.

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Answer:

C = λν E = hν C = 3.00 x 108 m/s h = 6.626 2 x 10-34 J-s (or J/Hz) 1 eV = 1.602 x 10-19 J

Explanation:

Answer:

2.273M

Explanation:

What is the definition of molarity.

M = mols/L. So that's what we need to determine.

How much does a L weigh? That's

1.114 g/mL x 1000 mL = 1114 grams. Simple enough, eh?

How much of that 1114 g is H3PO4. It says it is 20% by mass, therefore, 1114 g x 0.20 = 222.8 g.

How many mols are there in 222.8 g H3PO4? That's mools = grams/molar mass = 222.8/98 = 2.273 mols.

The definition of M is what? M = mols/L. And you have 2.273 mol/L; that must be the molarity.

The formula is

density g/mL x 1000 mL x mass% x (1/molar mass) = M

1.114 x 1000 x 0.20 x (1/98) = 2.273 M.

The speed of the car at each checkpoint cannot be determined because the parameter is not given.

For a moving car, the speed can be defined as the change magnitude in the position of a car or the distance traveled by the car within a specified time.

Mathematically;

[tex]\mathbf{speed = \dfrac{distance}{time}}[/tex]

From the information given; the distance at each checkpoint can be calculated by finding the difference in distance between the previous checkpoint and subsequent checkpoint divided by the change in time.

i.e

[tex]\mathbf{speed = \dfrac{d_A - d_B}{\Delta t}}[/tex]

where:

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answer is below           .     .     .

Answer:

1 M

Explanation:

The molarity of a solution, M, is a measure of the concentration of that solution and it refers to the number of moles of solute (mol) per liter (L) of solution. The molarity (M) can be calculated using the formula:

M = number of moles (n) /volume (V)

In this question, a 500 ml aqueous solution of Na3PO4 was prepared using 82g of the solute.

Molar mass of Na3PO4 = 23(3) + 15 + 16(4)

= 69 + 31 + 64

= 164g/mol

Mole = mass/molar mass

mole = 82/164

mole = 0.5 mol

Volume in Litres (L) = 500 ml ÷ 1000 = 0.500L

Therefore, Molarity (M) = 0.5/0.500

Molarity = 1 M or 1 mol/L

The molarity of the solution is 1 M

From the question,

We are to determine the molarity of the solution.

First, we will determine the number of moles of the solute (Na₃PO₄) present

Mass of Na₃PO₄ = 82 g

Using the formula

[tex]Number\ of\ moles = \frac{Mass }{Molar\ mass}[/tex]

Molar mass of Na₃PO₄ = 163.94 g/mol

∴ Number of moles of Na₃PO₄ present = [tex]\frac{82}{163.94}[/tex]

Number of moles of Na₃PO₄ present = 0.500 moles

Now, for the molarity of the solution

Using the formula

[tex]Molarity = \frac{Number\ of\ moles}{Volume}[/tex]

Volume of the solution = 500 mL = 0.5 L

∴ Molarity of the solution = [tex]\frac{0.500}{0.5}[/tex]

Molarity of the solution = 1 M

Hence, the molarity of the solution is 1 M

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Answer:

2 moles.

Explanation:

2NaOH + H2SO4 -->  Na2SO4 + 2H2O

This shows that 2 moles of NaOH give 1 mole of Na2SO4.

So 4 moles produces 2 moles of Na2SO4.

Answer:

A) type of food.