1st 9 weeks test

When iron nails get rusty, heat is released.  What process is this?

• Exothermic
• Endothermic

Tags

NGSS.HS-PS1-4

Is photosynthesis an exothermic or endothermic reaction?

• Endothermic
• Exothermic

Tags

NGSS.MS-LS1-6

What happens to the bonds when 2 substances react

• They break so new bonds can form
• Nothing the bonds are too strong
• They change colour

Tags

NGSS.HS-PS1-4

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• bubbles of gas appear
• dissolving

Tags

NGSS.MS-PS1-2

0_{2 (g)+} 2H_{2-------------}2H₂0 + Energy

• endothermic

• exothermic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a product?

• The starting substance
• The ending substance

Tags

NGSS.MS-PS1-5

What is a reactant?

• The starting substance
• The ending substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a chemical reaction?

• Burning bread in the toaster.
• melting wax in a microwave.
• dissolving salt in water
• boiling water to make steam.

Which is Chemical Equation is Balanced?

• CH₄+O₂------CO₂+2H₂O
• H₂+O₂-----2H₂O₄
• 4Al+3O₂-----2Al₂O₃

Tags

NGSS.MS-PS1-5

B₂ + 3W₂ => 2BW₃

• Balanced
• Unbalanced

Tags

NGSS.MS-PS1-5