7th Grade Practice 1

Alex wants to mix two substances together and to find out if a chemical reaction happens. What should he do?

• test the solubility before and after mixing
• measure the volume before and after mixing
• measure the mass before and after mixing
• test the density of the before substance but not the after substances.

Tags

NGSS.MS-PS1-2

a student mixes  apple juice, water, and cinnamon together. Did a chemical reaction occur?

• Yes, because the apple juice changed the color of the water.
• yes, because the temperature stayed the sam
• no, because the properties stayed the same.
• yes, because dissolving is always a chemical reaction.

Tags

NGSS.MS-PS1-2

A molecule is

• a singular particle of a particular element

• another name for an element

• 2 or more atoms that are combined

Tags

NGSS.MS-PS1-1

A pure substance that is a compound is made out of

• particles of more than one type of atom

• particles of the same type of atom

• a mixture of two or more substances that can be physically separated

Tags

NGSS.MS-PS1-1

Gold is an example of a(n) 

• pure element
• pure compound
• pure mixture

A _________ is a substance made of two or more DIFFERENT elements chemically combined. 

• mixture
• compound
• substance 

Tags

NGSS.MS-PS1-1

A mixture can be separated by ________ means. 

• physical
• chemical

Tags

CCSS.RI.6.5

CCSS.RI.7.3

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

A molecule is made up of

• one or more mixtures.
• one or more compounds.
• one or more atoms.
• one or more solutions.

Tags

NGSS.MS-PS1-1

Which mixture is a solution?

• Muddy water

• potting soil

• cranberry juice

• milk

What is a physical combination of two or more substances that are blended together without forming a new substance?

• Distillation

• Mixture

• Solute

• Solvent