8.P.1.3 8.P.1.4

Which of the following events would indicate a chemical change has occurred?

• A change in temperature

• A change in color

• A precipitate was formed

• All of the above

Tags

NGSS.MS-PS1-2

Which statement is true about a chemical reaction?

• The physical states of the atoms in the reactants determine the products.

• Some of the atoms in the reactants will be a part of the products

• The number of atoms in the reactants determines the products

• All of the atoms in the reactants will be a part of the products

Tags

NGSS.MS-PS1-5

Does this model represent the law of conservation of mass?

• Yes

• No

Tags

NGSS.MS-PS1-5

Sugar molecules & water molecules are represented by the circles in the chart below. Which BEST represents sugar dissolved in water?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

List the steps of the scientific method

d

e

f

c

b

a

Analyze results

Communicate results

Form a hypothesis

Ask a question

Conduct experiment

Draw conclusions

Tags

NGSS.MS-PS2-2

Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS4-1

• Several molecules of water are produced

• The mass of carbon atoms is reduced during the reaction

• The mass of the atoms in the reactant equals the mass of the atoms in the products

• The mass of hydrogen atoms is the only thing that remains the same before and after the reaction

Tags

NGSS.MS-PS1-5

After a chemical reaction occurs in an open test tube, measurements indicate that the mass of the reactants is greater than the mass of the products remaining in the test tube. What most likely explains the measurements?

• A gas was produced

• A solid was produced

• The salinity of the reactants was high

• The temperature of the reactants was low

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A scientist places a sample of lithium into water. The scientists observed the lithium floating, making a buzzing sound and bubbles were formed. Which conclusion is BEST supported by this observation?

• A chemical change took place

• The lithium was dissolved by the water

• Dissolved gases were released

• Water is vaporized

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement BEST describes the organization of the Periodic Table of elements?

• All gases are grouped together

• Gases easily form compounds with other elements

• Elements within a group have similar properties

• Elements within a period have the same number of electrons