Chemistry

What is a reactant?

• The starting substance
• The ending substance

Tags

NGSS.MS-PS1-1

What is a product?

• The starting substance
• The ending substance

Tags

NGSS.MS-PS1-1

Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the reactant(s).

• Hydrogen and Oxygen
• water

Tags

NGSS.MS-PS1-2

Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the product(s).

• Hydrogen and oxygen
• water

Tags

NGSS.MS-PS1-2

^{Angelina mixes 2 substances together in a beaker. The beaker becomes hot and the liquid changes color.
Did a chemical reaction occur?}

• yes, because the properties changed and a new substance was made.
• no, because the properties did not change.

Tags

NGSS.MS-PS1-2

Which of the following are NOT signs that a chemical reaction occured?

• the properties changed
• bubbles of gas formed
• color stays the same
• smells different

Tags

NGSS.MS-PS1-2

What is a precipitate?

• a change in color 
• a change in temperature
• a solid formed
• a gas formed

Tags

NGSS.MS-PS1-2

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

Burning is always a chemical reaction.

• True
• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5