Choose all the physical changes.

Liquid water becomes water vapor.

Sodium chloride (NaCl) dissolves in water.

Dry ice (solid CO2) sublimates to CO2 gas.

Combining sulfuric acid and sodium chloride gives off hydrogen chloride gas.

Choose all the chemical changes.

Combining sulfuric acid and sodium chloride gives off hydrogen chloride gas.

Liquid water becomes water vapor.

Sodium chloride (NaCl) dissolves in water.

Dry ice (solid CO2) sublimates to CO2 gas.

How are chemical reactions different from a physical change?

chemical reactions create a new substance, physical changes do not

physical changes create a new substance, chemical reactions do not

chemical reactions happen more, physical changes happen less

physical changes happen more, chemical reactions happen less

A physical change happens when …

the substance does not change into a new substance with new chemical properties

the substance changes into something different with new chemical properties

Which of the following is a common sign that a chemical change has occurred?

A chemical has turned a different color

A chemical has changed to a different state of matter

A chemical has become a different shape

Which phrase describes particle movement in a solid?

Particles vibrate within fixed positions

Particles can slip past one another

Particles move independently from one another

Which phrase describes particle movement in a liquid?

Particles can slip past one another

Particles move independently from one another

Particles vibrate within fixed positions

Which phrase describes particle movement in a gas?

Particles move independently from one another

Particles vibrate within fixed positions

Particles can slip past one another

Hector is standing in a closed room with a balloon filled with helium gas. If Hector pops this balloon, what will happen to the molecules in the helium gas?

They will expand and flow through the room

They will condense into a cloud around Hector.

They will fall to the floor as a structured solid.

They will flow to the floor and form a puddle.

When you heat a sample of gas, what happens to the particles that make up the gas?

The particles become more dense

The Law of Conservation of Mass states

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

that matter exists in all states and reacts the same

that matter can only be changed into new substances by introducing a catalyst

that matter exists in the same state throughout any chemical change

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

the product is half the mass of the reactants

the mass changes depending on the reaction

10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be concluded?

This experiment violates the conservation of mass

The excess reactant is destroyed & disappears during the reaction

There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

You cant tell with the given information

Chemistry Common Assessment Grade 8 (PS1-1, 1-2, 1-4, 1-5)

Authored by Becky Dean

Chemistry

8th Grade

NGSS covered

Used 24+ times

Chemistry Common Assessment Grade 8 (PS1-1, 1-2, 1-4, 1-5)

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60 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which subatomic particle determines the element?

protons

neutrons

electrons

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement best describes an electron?

Smaller mass than a proton and a negative charge

Smaller mass than a proton and a positive charge

Greater mass than a proton and a negative charge

Greater mass than a proton and a positive charge

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What particle is Y?

Proton

Neutron

Nucleus

Electron

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What particle is X?

Proton

Neutron

Nucleus

Electron

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the basic unit of matter? (Hint: What is all matter made up of?) Cells Light Atoms Nucleus

Cells

Light

Atoms

Nucleus

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT part of an atom?

Electron

Element

Proton

Neutron

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Are made from a combination of 2 or more elements in fixed proportions...

Molecules

Pure Substances

Compounds

Elements

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Chemistry Common Assessment Grade 8 (PS1-1, 1-2, 1-4, 1-5)

Which subatomic particle determines the element?

Which statement best describes an electron?

What particle is Y?

What particle is X?

What is the basic unit of matter? (Hint: What is all matter made up of?) Cells Light Atoms Nucleus

Which of the following is NOT part of an atom?

Are made from a combination of 2 or more elements in fixed proportions...

A combination that can be separated by physical processes is a .....

A mixture that is NOT evenly distributed is called ....

Mixture, such as mixed nuts or dry soup mix, in which different materials are unevenly distributed and are easily identified.

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