1.

Question

(02.01 LC)

Belinda wrote the following phrase to describe the movement of particles in a state of matter.

"Marbles glide past one another."

Which state of matter did Belinda most likely describe? (1 point)

Gas

Liquid

Plasma

Solid
2.
(02.01 MC)

To demonstrate the arrangement of atoms in solids, a teacher tapes off a square section on the classroom floor. How should the students modeling as atoms stand or move in the taped-off section? (1 point)

They should leave some vacant space and move around one another.

A few students should move about holding hands in one half of the space.

They should all squeeze close together so that there is no vacant space.

A few students should run randomly in the entire space within the section.
3.
(02.01 LC)

Four students described the characteristics of four different states of matter. The table below shows the description given by each student.
Description of States of Matter
Student Description
A Particles are close together, randomly arranged
B Particles are far apart, constantly collide
C Particles are close together, arranged in fixed pattern
D Particles are charged that float around

Which student described liquids? (1 point)

Student A

Student B

Student C

Student D
4.
(02.01 MC)

Two states of matter are described below.

State X: Particles are ions that are far apart
State Y: Particles are molecules that are far apart

Which combination of the state and a substance in that state is correct? (1 point)

State X = lightning; State Y = air

State X = oxygen; State Y = neon

State X = oxygen; State Y = water

State X = air; State Y = milk
5.
(02.02 LC)

Which of the following most likely happens during a chemical change? (1 point)

No new substances are formed.

Properties of a substance remain unchanged.

Composition of a substance is same as before.

Different substances than before are produced.
6.
(02.02 MC)

A plant uses carbon dioxide and water to form food and oxygen. Why is this a chemical change? (1 point)

The mass of the plant increases greatly.

The properties of water and food are same.

The plant increases in height as food is produced.

The properties of carbon dioxide and oxygen are different.
7.
(02.02 MC)

Which of these is an example of a change where the properties of the original substances remain the same? (1 point)

Roasting corn on the cob

Soaking rice in water

Toasting bread

Digesting food
8.
(02.02 LC)

Which property describes the way substances react with other substances to form new substances? (1 point)

Chemical Property

Malleability

Physical Property

Sublimation
9.
(02.02 MC)

Bonny wrote the following examples of changes in substances.

Example A: Detergents break down deposits on clothing.
Example B: Water in a bowl evaporates on a sunny day.

Which statement is correct? (1 point)

Both are examples of physical changes.

Both are examples of chemical changes.

Example A describes a physical change and Example B describes a chemical change.

Example A describes a chemical change and Example B describes a physical change.
10.
(02.03 LC)

To make lemonade Erica dissolved 30 g of sugar in a certain amount of water. By what amount is the mass of water likely to increase after the sugar dissolves? (1 point)

0 g

10 g

15 g

30 g
11.
(02.03 MC)

Clara made ice-cream by mixing 200 g of strawberry juice with 500 g of cream. What is most likely the mass of the ice-cream formed and why? (1 point)

700 g, mass of ingredients is unchanged when they are mixed

500 g, mass will equal the mass of the greater ingredient

700 g, mass of ingredients are added in this chemical change

350 g, mass of the product is the average of the mass of the ingredients
12.
(02.03 HC)

Mac mixed 24 g of Substance A and 12 g of Substance B to form 10 g of Substance C and a certain amount of Substance D. Which statement is correct? (1 point)

The mass of Substance D was 2 g greater than the mass of Substance A.

The mass of Substance D was 10 g greater than the mass of Substance B.

The mass of Substance A was equal to the total mass of Substance C and Substance D.

The mass of Substance A was equal to the total mass of Substance B and Substance D.

Answer 1

Here are the answers to your questions:

1. Which state of matter did Belinda most likely describe?
   Answer: Liquid
   (Particles in a liquid state glide past one another, unlike solids where particles are fixed in place.)

2. How should the students modeling as atoms stand or move in the taped-off section?
   Answer: They should all squeeze close together so that there is no vacant space.
   (In solids, particles are tightly packed and do not move around freely.)

3. Which student described liquids?
   Answer: Student A
   (Student A describes particles that are close together but randomly arranged, which is characteristic of liquids.)

4. Which combination of the state and a substance in that state is correct?
   Answer: State X = lightning; State Y = air
   (State X described as ions that are far apart can refer to plasma found in lightning, while State Y refers to air, which is made up of molecules that are far apart.)

5. Which of the following most likely happens during a chemical change?
   Answer: Different substances than before are produced.
   (This is the defining characteristic of a chemical change.)

6. Why is this a chemical change?
   Answer: The properties of carbon dioxide and oxygen are different.
   (The transformation of substances during photosynthesis changes their chemical properties.)

7. Which of these is an example of a change where the properties of the original substances remain the same?
   Answer: Soaking rice in water
   (Soaking does not change the chemical properties of the rice; it simply alters its physical state.)

8. Which property describes the way substances react with other substances to form new substances?
   Answer: Chemical Property
   (Chemical properties involve how a substance interacts and reacts with others to form new substances.)

9. Which statement is correct about the examples?
   Answer: Example A describes a chemical change and Example B describes a physical change.
   (Detergents breaking down deposits involve chemical reactions, while evaporation of water is a physical change.)

10. By what amount is the mass of water likely to increase after the sugar dissolves?
    Answer: 30 g
    (The mass of the system is conserved; thus, if 30 g of sugar dissolves, the water's mass increases by that amount.)

11. What is most likely the mass of the ice-cream formed and why?
    Answer: 700 g, mass of ingredients is unchanged when they are mixed
    (The mass is the sum of the individual masses of the ingredients, assuming no loss.)

12. Which statement is correct?
    Answer: The mass of Substance A was equal to the total mass of Substance C and Substance D.
    (Based on the law of conservation of mass, the total mass of substances before the reaction must equal the total mass after the reaction.)