Physical Science Reactions

When two clear liquids were combined in a beaker, the temperature increased and a yellow powder formed. This most likely means that:

• One substance dissolved in the other

• A chemical reaction took place

• The two substances are non-reactive

• The two substances had high melting points

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:

• The two substances are non-reactive

• The two substances had low boiling points

• A chemical reaction took place

• One substance dissolved in the other

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the following reaction: NaOH + HNO3 --> NaNO3 + H2O

What compounds are the reactants?

• NaNO3 + H2O

• NaOH + NaNO3

• HNO3 + H2O

• NaOH + HNO3

In the following reaction: 2K + Br2 --> 2KBr

What substances are the products?

• 2K+2KBr

• 2KBr

• 2KBr + Br2

• Br2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Suppose the total mass of two reactants is 40 grams. After the chemical reaction, What should be the total mass?

• 0 grams

• 4 grams

• 40 grams

• 400 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An (a)   reaction releases excess energy in the form of light, heat, or even sound.

Tags

NGSS.MS-PS3-4

Which observation most likely indicates that an endothermic reaction has occurred?

• A color changed

• The production of gas bubbles

• An increase in temperature

• A decrease in temperature

Tags

NGSS.MS-PS1-4

Hydrogen and oxygen react ro produce water. How many molecules of water are produced?

2H₂ + O₂ ---> ___________

• H₂O

• 2H₂O

• H₄O₂

• 4H₂O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

What type of reaction is the following:

CaCO₃ →CaO + CO₂

• Single Displacement

  Reaction

• Synthesis Reaction

• Decomposition Reaction

• Double Displacement Reaction

What type of reaction is the following:

BaCl₂  +  Na₂SO₄ → BaSO₄  +  2NaCl

• Single Displacement Reaction

• Decomposition Reaction

• Double Displacement Reaction

• Synthesis Reaction