CHEMISTRY HIGH SCHOOL

What is evaporation? Describe what happens at the molecular level during evaporation.

Answers

Answer 1
Answer:  Evaporation happens when atoms or molecules escape from the liquid and turn into a vapor. Not all of the molecules in a liquid have the same energy. Sometimes a liquid can be sitting in one place (maybe a puddle) and its molecules will become a gas. That's the process called evaporation. It can happen when liquids are cold or when they are warm. It happens more often with warmer liquids. You probably remember that when matter has a higher temperature, the molecules have a higher energy. When the energy in specific molecules reaches a certain level, they can have a phase change. Evaporation is all about the energy in individual molecules, not about the average energy of a system. The average energy can be low and the evaporation still continues. 
Answer 2
Answer:

Answer:

When liquid turns to gas

Explanation:


Related Questions

MIDDLE SCHOOL

Write hypothesis about a valcano

Answers

If the volcano explodes then my hypothesis is correct because...
For that part I need a bit more info if u want u can txt me back :)
MIDDLE SCHOOL

How many molecules are there in 1 miligram Au?​

Answers

Answer:

30.11  × 10¹⁷ atoms

Explanation:

Given data:

Mass of Au = 1 mg (0.001 g)

Number of molecules / atom = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

Number of moles of Au = mass/ molar mass

Number of moles of Au = 0.001 g/ 197 g/mol

Number of moles of Au = 5 × 10⁻⁶ mol

Number of atoms:

one mole = 6.022 × 10²³ atoms

5 × 10⁻⁶ mol × 6.022 × 10²³ atoms / 1mol

30.11  × 10¹⁷ atoms

MIDDLE SCHOOL

In a closed container at 1.0 atmosphere, the temperature of a sample of gas is raised from 300K to 400K. What will be the final pressure of the gas? *
A. 0.010 atm
B. 0 atm
C. 100 atm
D. 1.3 atm

Answers

Answer:

A. 0.010 atm awnser would be

Explanation:

HIGH SCHOOL

Gaseous acetylene (c2h2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water. express your answer as a chemical equation. identify all of the phases in your answer.

Answers

1. Gaseous acetylene (C2H2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water. 2. Chlorine gas reacts with aqueous potassium iodide to form solid iodine and aqueous potassium chloride. 3. Solid lithium oxide reacts with liquid water to form aqueous lithium hydroxide. 4. Gaseous carbon monoxide reacts with oxygen gas to form carbon dioxide gas.

2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)

HIGH SCHOOL

Hydrogen sulfide decomposes according to the following reaction, 2 H2S(g) → 2 H2(g) + S2(g) where ∆S = +78.1 J/K, ∆H = +169.4 kJ, which answer describes the entire range of temperatures where the reaction would be spontaneous?

Answers

Answer:

The reaction is spontaneous when T > 2170 K.

Explanation:

The spontaneity of a reaction is related to the standard Gibbs free energy (ΔG°). When ΔG° < 0 the reaction is spontaneous. ΔG° is related to the standard enthalpy (ΔH°) and the standard entropy (ΔS°) through the following expression:

ΔG° = ΔH° - T.ΔS°

where,

T is the absolute temperature

The reaction is spontaneous when ΔG° < 0, that is,

ΔH° - T.ΔS° < 0

ΔH° <  T.ΔS°

T > ΔH°/ΔS° = (169.4 × 10³ J)/(78.1 J/K) = 2170 K

The reaction is spontaneous when T > 2170 K.

MIDDLE SCHOOL

50 POINTS*** Which of the following is not a correct chemical equation for a double displacement reaction? A) 2RbNO3 + BeF2 yields Be(NO3)2 + 2RbF
B) CaCl + LiCO3 yields CaCO3 + LiCl
C) Na3PO4 + 3KOH yields 3NaOH + K3PO4
D) 2MgI2 + Mn(SO3)2 yields 2MgSO3 + MnI4

Answers

Answer:-

B) CaCl2 + Li2CO3 --> CaCO3 + 2LiCl

D) 2MgI2 + Mn(SO3)2 ---> 2MgSO3 + MnI4

Explanation:-

For a reaction to be double displacement reaction there are two things we need to look for

1) There must be an interchange of the group of ions

2) The reactants must dissolve in water to release ions

In this question every option shows an interchange of ions. So we must use the second criteria to find out which one is not a double displacement reaction.

In case of B the two reactants are CaCl2 and Li2CO3.

Li2CO3 does not form ions on dissolving in water. It is because carbonate salts are not soluble in water.

Hence B) CaCl2 + Li2CO3 --> CaCO3 + 2LiCl is not a double displacement reaction.

In case of D the two reactants are MgI2 and Mn(SO3)2.

Mn(SO3)2 does not form ions on dissolving in water. It is because sulphite salt of metals except potassium and sodium are not soluble in water.

Hence D) 2MgI2 + Mn(SO3)2 ---> 2MgSO3 + MnI4 is not a double displacement reaction.

I mostly believe in between D and B beacuse K3po4 and caco3 is not an element equation

COLLEGE

Identify the missing atom or subatomic particle, AZX, for the following reactions. Then, classify each nuclear reaction represented below as a fission or fusion reaction. (Enter your answer in the form A X Z .) (a) 23392U + 10n → 13351Sb + AZX + 3 10n

Answers

Answer: A X Z is 98 Nb 41

Explanation:

In balancing nuclear equations, we observe the following rules:

I. The total number of protons and neutrons in the products and reactants must be the same ( conservation of mass number ).

II. The total number of nuclear charges in the products and reactants must be the same ( conservation of atomic number ).

Examples: Balance the following nuclear equations ( that is, identify the product X )

I. 21284Po = 20882Pb + X

II. 13755Cs = 13756Ba + X

Solution

I. 21284Po = 20882Pb + 4He2

II. 13755Cs = 13756Ba + 0e-1

So, for (I) X is an alpha particle, (II) X is an electron.

For your question, the nuclear equation is:

(a) 23392U + 10n = 13351 Sb + 98Nb41 + 3 10n

Check to see if the equation is balanced:

Mass number of reactants: 233+1= 234

Mass number of products:

133+98+(3x1) = 234

Nuclear charge of reactants:

92+0 = 92

Nuclear charge of products:

51+41+(3x0) = 92.

This reaction (a) is a nuclear fission reaction.

Nuclear fission is a process in which a heavy nucleus ( mass number greater than 200 ) divides to form smaller nuclei of intermediate mass with a release of energy and radiation.

This is applied in the design of the atomic or fission bomb.

HIGH SCHOOL

Please help! will give brainliest!! What do baking powder, baking soda and creme of tartar all have in common?
List one property of each substance above that makes it useful.

Answers

They all help baked goods
Sodium bicarbonate(baking soda) is commonly reacts with acids such as buttermilk or lemon by creating a chemical reaction
Baking powder often reacts with bases by releasing a gas
Tartaric acid(cream of tartar) has a chemical reaction that creates a gas to lighten batter
COLLEGE

Hydrogen has two naturally occurring isotopes, 1H and 2H. Chlorine also has two naturally occurring isotopes, 35Cl and 37Cl. Thus, hydrogen chloride gas consists of four distinct types of molecules: 1H35Cl, 1H37Cl, 2H35Cl, and 2H37Cl. Place these four molecules in order of decreasing rate of effusion. Rank molecules from highest rate of effusion to lowest. To rank items as equivalent, overlap them.

Answers

Answer:

The order of effusion from highest to lowest will be:

> > >

Explanation:

Isotopes of hydrogen ; and

Isotopes of chlorine ; and

Mass of = 1 g/mol

Mass of = 2g/mol

Mass of = 35 g/mol

Mass of = 36 g/mol

Mass of = 1 g/mol+35 g/mol =36 g/mol

Mass of = 1 g/mol+37 g/mol =38 g/mol

Mass of = 2 g/mol+35 g/mol =37 g/mol

Mass of = 2 g/mol+37 g/mol =39 g/mol

Graham's law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

Decreasing order of masses :

> > >

So, the order of effusion will be revered :

< < <

The order of effusion from highest to lowest will be:

> > >

Random Questions