Conservation of mass means that the mass of the starting system has to equal the mass of the ending system. 2 students put a small bathbomb in a bowl on a scale and watch it fizz. They notice that the mass at the end is less than the starting mass. Why?

The gas bubbles have mass. When they left the mass went down.

The scale must be broken, because the mass can't change in an open system

The water evaporated. Therefore there was less water and it had less mass.

The bath bomb had mass. As it dissolved the mass of the system went down

When should you do a density test?

When you need to know if something will sink or float

When you need to know if something will catch on fire

When you need to know the temperature of something

When you need to know when something will turn into a solid

When should you do a flammability test?

When you need to know if something will catch on fire

When you need to know when something will melt

When you need to know the color of something

When you need to know if something will float or sink

When should you do a solubility test

When you need to know if something will dissolve

When you need to know how something acts around fire

When you need to know how dense something is

When you need to know when something melts

Which resources can you use on your test?

Your friends and their notebook

Unit 1 study guide: chemical reactions

Quiz

•

Chemistry, Science

•

6th - 8th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-PS1-2, MS-PS1-1, MS-PS1-5

+2

Standards-aligned

Shirlene Keupen

Used 92+ times

FREE Resource

35 questions

Show all answers

1.

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of these are products in the bath bomb reaction?

Sodium Citrate

Carbon Dioxide

Baking Soda

Nitrogen gas

Made of one type of material throughout

Atom

Molecule

Mixture

Substance

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

when a solid breaks into particles too small to see and it mixes completely in the liquid

Substance

Dissolve

Soluble

Property

Describes a material that can dissolve in a particular substance

Soluble

Insoluble

Substance

Mixture

Describes a material that does not dissolve in something else.

Soluble

Insoluble

Substance

Mixture

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

a blend of two or more substances

Property

Substance

Mixture

Flammability

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A characteristic of a substance that doesn’t change

Matter

Molecule

Atom

Property

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Unit 1 study guide: chemical reactions

35 questions

Which of these are products in the bath bomb reaction?

Made of one type of material throughout

when a solid breaks into particles too small to see and it mixes completely in the liquid

Describes a material that can dissolve in a particular substance

Describes a material that does not dissolve in something else.

a blend of two or more substances

A characteristic of a substance that doesn’t change

How a substance interacts with fire

how much stuff is in a space, or the mass of a substance divided by its volume

a change in state of matter or shape; nothing new is formed

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