Chemistry-Reactions

Which of the following is a chemical property?

• color
• hardness
• freezing point
• ability to react with oxygen

All of the following are physical properties of matter EXCEPT

• mass
• color
• melting point
• ability to rust

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to matter during a chemical reaction?

• matter is neither destroyed or created
• some matter is destroyed
• some matter is created
• some matter is destroyed and some is created

Tags

NGSS.MS-PS1-5

Which of the following is TRUE for all chemical reactions?

• the total mass of the reactants increases
• the total mass of the products is greater than the total mass of the reactants
• the total mass of the products is less than the total mass of the reactants
• the total mass of the reactants equals the total mass of the products

Tags

NGSS.MS-PS1-5

True or False: When balancing chemical equations the subscripts can change.

• true
• false

Tags

NGSS.HS-PS1-7

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

Which of the following is evidence of a chemical reaction?

• fizzing
• water changing to ice
• saltwater
• paper being cut in half

Tags

NGSS.MS-PS1-2

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products
• reactants
• yield
• chemical formula