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

Answers

Answer 1

Answer:

I think it's A because effusion is a gas escaping from a tiny hole

Explanation:

I just finished the test and got it right :)

Answer 2

Answer:

A on edge 2020

Explanation:

I took the test and got 100, hope this helps:)


Related Questions

A 200.0-mL sample of helium gas is in a cylinder with a movable piston at 110 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?

51.1 kPa
261 kPa
249 kPa
274 kPa

Answers

Answer:

P₂ = 261 KPa

Explanation:

Given data:

Volume of sample = 200 mL

Initial pressure = 110 KPa

Initial temperature = 275 K

Final volume = 95 mL

Final temperature = 310 K

Final pressure = ?

Solution:

Formula:

P₁V₁/T₁ = P₂V₂/T₂

P₂ = P₁V₁T₂ /T₁ V₂

P₂ = 110 KPa× 200 mL× 310 K /275 K  × 95 mL

P₂ = 6820000 KPa / 26125

P₂ = 261 KPa

What is the oxidation state of Hg in Hg2Cl2?​

Answers

Answer:

+1

Explanation:

Electrochemistry. In oxidation–reduction (redox) reactions, electrons are transferred from one A redox reaction is balanced when the number of electrons lost by the reductant Hg(l)∣Hg2Cl2(s)∣Cl−(aq) ∥ Cd2+(aq)∣Cd(s).

As is evident from the Stock number, mercury has an oxidation state of +1. This makes sense, as chlorine usually has an oxidation state of -1.

The  oxidation state of Hg in Hg₂Cl₂ compound is +1 as both subscripts of elements are eliminated.

What is a compound?

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

Learn more about compounds,here:

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which of the following pair of elements could not react to form an ionic compound
co and br
c and o
k and f
ag and o

Answers

Answer:

c and o

Explanation:

Carbon and Oxygen cannot react to form an ionic compound because the two elements are non-metals.

To form an ionic bond, a metal combines with a non-metal through electrostatic attraction of oppositely charged ions. This leads the bond formation. Carbon is a non-metal, with oxygen, they will prefer to form a covalent bond where they share their electrons

The pair of elements that could not react to form an ionic compound is C and O. Thus option B is correct.

Ionic compounds are formed by the electrostatic interaction of the metal atom with a non-metal. The ionic bonds are weaker bonds and are easily dissociated in the water.

The ionic compounds can be:

CO and Br are metal and nonmetal with different charges, and thus form the ionic compound.

C and O, both are non-metals, and thus will not form an ionic compound.

K and F, having K as metal and F as a nonmetal forming the ionic compound.

Ag and O, have a metal and a nonmetal and have been able to form an ionic compound.

The pair of elements that could not react to form an ionic compound is C and O. Thus option B is correct.

For more information about the ionic compound, refer to the link:

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Why are liquid and gas molecules different

Answers

gas is separated with no regular arrangement and liquid is close with no regular arrangement (i hope this helps)

What causes rain to precipitate from clouds?

Answers

Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.

Explanation: Have a blessed day!

Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.

Explanation:hope this helps u

Use the model to answer the question.
Which element symbol actually represents the model?

Plz answer

Answers

Answer:

B

Explanation:

Boron has 5 protons.

How many atoms are represented in NH4

Answers

Answer:

5 atoms

Explanation:

it has 4 hydro atoms and 1 nitrogen atom therefore it is 5

Answer:

the answer is 14

Explanation:

i just took the test on  Edg an i got it right

a girl pose a spoonful of sugar into a glass of warm water water into the sugar disappears when she choose the water you notice that it t is now suite which describes the kind of matter in the glass
A=Compound
B=An element
C- soultion
d- sUBTANCE

Answers

Answer:

Solution!

Explanation:

Becuase the water didn't change when the sugar was mixed in. :)

SECTION A

For these questions, your equation will be straight forward to balance.

In a titration, 20 cm3 of 2.0 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?

In a titration, 20 cm3 of 0.2 mol dm-3 HCl reacted with 50 cm3 of NaOH. What was the concentration of the sodium hydroxide?

In a titration, 20 cm3 of 0.15 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?

In a titration, 20 cm3 of 1.14 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?

Answers

Answer:

20cm=the length of the causation that it loads about the contrasting of the solution it is an easy question to answer it just has too many parts I answered one and I hope it helped to give you a hint towards solving the whole thing good luck

Explanation:

I tried!

In a titration, 20 cm3 of 2.0 mole dm-3 HCl reacted with 25 cm3 of NaOH. The concentration of the sodium hydroxide is 1.6 mole.

What is titration?

Titration  is defined as the procedure of determining the quantity of some ingredient of a sample by introducing a precisely known quantity of another substance to the measured sample with whereby the desired ingredient interacts in a predictable manner.

There are basically four type of titration.

Acid base titrationRedox titrationPrecipitation titrationComplex metric titration

M1V1 = M2V2

The concentration of the sodium hydroxide

M2 = M1V1 / V2

M2 = 2.0 x 20 / 25

M2 = 1.6 mole

The concentration of the sodium hydroxide = 0.08 mole

The concentration of the sodium hydroxide = 0.12 mole

The concentration of the sodium hydroxide  = 0.912 mole

Thus, in a titration, 20 cm3 of 2.0 mole dm-3 HCl reacted with 25 cm3 of NaOH. The concentration of the sodium hydroxide is 1.6 mole.  

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For the following reaction:
N2 + 3H2 -> 2NH3
What mass of NH3 can be produced from 14.9g N2 and 3.8 g H2 ?

Answers

Answer:

Nitrogen is the limiting reactant, and  

3.74

grams of ammonia is formed.

Explanation:

We have the familiar Haber process equation...

N

2

(

g

)

+

3

H

2

(

g

)

2

N

H

3

(

g

)

Since the mole ratio of  

N

2

to  

H

2

is  

1

:

3

, then for every mole of nitrogen, we would need three moles of hydrogen.

Explanation:

29. What is the noble gas configuration for tellurium?

Answers

Answer:

[Kr] 4d10 5s2 5p4 is the electronic configuration for tellurium.

Electrons per shell: 2,8,18,18,6

Atomic number: 52

Symbol: Te

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! You think that although there are some differences, the human nervous system is similar to a computer. You're friend says, "No way! A computer is just metal, wires, and plastic." Develop an argument that would persuade your friend that there are similarities between these two systems. Include specific examples and evidence to support your position.

Answers

Answer:

We have nerves that are just like wires that run through our body that tells us what is going on and what to do about it. The hard dive like in a computer is our brain, which is made up of three parts that control things like coordination, movement, involuntary, and voluntary movement. The sensory numerous just like the keys in a computer pick up what we are doing in life.

Explanation:

Choose all of the following mole ratios that are correct for the reaction given below. Be sure to choose all that apply.
N2 + 3 H2 --> 2 NH3
2 moles N2 = 3 moles H2
2 moles NH3 = 1 mole N2
3 moles H2 = 1 mole N2
3 moles H2 = 2 moles NH3

Answers

Answer:

2 moles NH3 = 1 mole of N2

3 moles of H2 = 1 mole of N2

3 moles of H2 = 2 moles of NH3

Explanation:

The balanced equation for the reaction is given below:

N2 + 3H2 —> 2NH3

From the balanced equation above,

1 mole of N2 reacted with 3 moles of H2 to produce 2 moles of NH3.

Thus, we can say that:

1 mole of N2 = 3 moles of H2

1 mole of N2 = 2 moles of NH3

3 moles of H2 = 2 moles of NH3

Thus, considering the options given above, the right answers to the question are:

2 moles NH3 = 1 mole of N2

3 moles of H2 = 1 mole of N2

3 moles of H2 = 2 moles of NH3

Answer:

3 h2=2nh3

2nh3=1n2

3h2=1n2

Explanation:


Hannah added a silvery white metal to a beaker of cold water and noticed that
gas bubbles were given off and a different substance formed. When she
repeated the activity with hot water she noticed the gas bubbles were released
much more rapidly. Which statement best explains why the reaction occurred
faster in hot water?
A ) Hot water increases the collision rate of the molecules, causing the
reaction to occur faster.
B ) Hot water changes the concentration of the chemicals, causing the
reaction to occur faster.
C ) Hot water increases the surface area of the molecules, causing the reaction
to occur faster.
D ) Hot water changes the chemical composition of the water molecules,
causing the reaction to occur faster.

Answers

Answer:

A. Hot water increases the collision rate of the molecules, causing the

reaction to occur faster.

Explanation:

Hot water molecules move faster than cold water molecules.

a bucket gets filled faster at ground floor then at 2nd floor .
give reason​

Answers

Answer:

because its on floor which makes it faster since the pipes dont go up and if they went up its gonna be alittle slower than the ground floor cuz in the ground floor it doesnt go Up and i think this is wrong but im sorry im not really good at explaining

Explanation:

What do you think makes fireworks different colors?

Answers

Answer:

So I searched it up and got, "They're created by the use of metal salts. ... Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks)."

WHY WAS I THINKING OF PAINT-

Explanation:

Have a great day though:)

How does the smell of baking cookies diffuse through the house

Answers

Not sure but cookies are good

perform the following operation and express the answer in scientific notation

Answers

Answer:

2×10⁻⁴

Explanation:

Given data:

2.8 ×10⁻⁶ + 1.4×10⁻²

Solution:

2.8 ×10⁻⁶ + 1.4×10⁻²

2×10⁻⁶⁺²

2×10⁻⁴

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

for example the number 6324.4 in scientific notation will be written as = 6.3244 × 10³

I need some help with this

Answers

newton’s first law of motion is also known as the law of inertia

what happens to crayons when heated?

Answers

they become liquified

Why is the cell a basic unit of life?

Answers

Answer:

Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.

Explanation:

put it in your own words

Because it is the smallest living thing it contains the genetic material for survival

when propene gas (C3H6) is added to bromine liquid, another liquid is produced which has the formula C3H6Br2. what is the chemical equation/formula​

Answers

Answer:

C3H6 + Br2 → C3H6Br2

Explanation:

The reaction in which C3H6Br2 (1,2-Dibromopropane) is created is:

C3H6 + Br2 → C3H6Br2

We can see that the only difference between the product (C3H6Br2) and the known reactant (C3H6) of the reaction is two bromine atoms (Br2). Br2 is diatomic bromine - a molecule we get after combining two bromine atoms. This compound is a red-brown liquid at room temperature, which means that that is the liquid described in your question.

Describe the current model of the atom. Name the parts of this model and describe each part.

Answers

Answer:

the electron cloud model is the current model of atom

do u have a picture ?

Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.

A 2-column table with 2 rows. The first row has entries Gain Energy, Lose Energy. The second row has entries nothing, nothing.

Which changes of state should she place in the column titled "Lose Energy"?

freezing, boiling, and melting
melting, vaporization, and sublimation
sublimation, deposition, and condensation
freezing, deposition, and condensation

Answers

Answer:

D

Explanation:

I took the test

Answer:

D took the test

Explanation:

write the correct representation of an element x which contains 12 electrons and 16 neutrons

Answers

Answer:

²⁸Mg

Explanation:

12 electrons means it is a Mg;

A typical Mg has 12 neutrons, but this has 16 hence it must be an isotope with 4 extra neutrons.

Where does shearing often occur?

Answers

Answer:

Shearing commonly occurs along the edges of tectonic plates, although it may occur in other places as well. Most often it takes place between 10 and 20 kilometers beneath the earth's surface. If the same process occurred at the surface, it would result in fracturing and faulting.

Explanation:

Answer:

Now if u could give us all the questions u got right! lol 8

Explanation:

It is important to understand the differences between chemical and physical changes. Chemical changes result in new substances, but physical changes do not. Which process is an example of a physical change?

Answers

Answer:

Melting of ice

Explanation:

A physical change is one in which just the physical properties of the matter is altered. Most phase changes reaction falls under this type of change.

Examples are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking glass, cutting wood. No new kinds of matter is formed. The process is reversibleNo change in mass

Which of these sets of elements have similar physical and chemical properties?

Answers

Answer:

F,Cl,I,BR

Explanation:

There all non-metals

The chemical and physical properties of Fluorine, Chlorine, Bromine, and Iodine have been similar. Thus option B is correct.

The physical and chemical properties of the elements have been based on the presence of the valence electrons in the element. The valence electrons are responsible for the reactivity of the element, and thereby the physical and chemical properties.

The elements belonging to the same group have been consisted of the same number of valence electrons, and thereby possess similar chemical and physical properties.

In the given set of options, Fluorine, Chlorine, Bromine, and Iodine have been belonging to the same group 17, and all have 7 valence electrons. The chemical and physical properties of these elements have been similar. Thus option B is correct.

For more information about the physical and chemical properties, refer to the link:

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The system brings molecules to the cells. It includes blood vessels and the heart.
respiratory system
digestive system
circulatory system
nervous system

Answers

Circulatory system is the correct answer

Which of the following landforms is created by erosion?

-Glacier Valleys

-Hoodoos

-Deltas

-Moraines

please help me out owo

Answers

Answer:Delta

Explanation:

i believe the answer is C, deltas.
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