Chemical and Physical changes

Chemical and Physical changes

What's the difference?

Multiple Choice

Which example best describes a physical change?

• iron rusting

• charcoal burning

• an ice cube melting

• a marshmallow burning

Multiple Choice

Phase change from a solid to a gas.

• sublimation

• deposition

• condensation

• evaporation

Multiple Choice

Which of the following is represented by point 3 on the graph above.

• Gas heating

• Sublimation

• Liquid Heating

• Evaporation

Multiple Choice

Color change like in a drop of food coloring in water, is a _________ change.

• physical

• chemical

Multiple Choice

A physical change _____________ the identity of the substance.

• changes

• maintains

Multiple Choice

Which process is a sign of a chemical change?

• A rotting potato gives off a bad smell

• A melting block of ice leaves a large puddle

• A cloud quickly changes shape when blown by wind

• A plaster statue breaks when it falls onto the floor

Multiple Choice

Which of the following is an example of synthesis?

• Na + Br₂ --> NaBr

• KClO₃ --> KCl + O₂

• HgO + Cl₂-->HgCl + O₂

• Cl₂ + NaBr --> NaCl + Br₂

Multiple Choice

4Si + S₈ --> 2Si₂S₄

• Synthesis

• Decomposition

• Single Displacement

• Double Displacement

Multiple Choice

Which of the following is an example of a decomposition reaction?

• 2NaF ⟶ 2 Na + F₂

• P₂O₅ + 3 H₂O ⟶ 2H₃PO₄

• 2FeCl₃ + 3Zn ⟶ 2Fe + 3ZnCl₂

• C₆H₁₂O₆ + 6O₂ ⟶ 6CO₂ + 6 H₂O

Multiple Choice

When Rihanna broke up with Chris Brown and then got with Drake who what represents the Single replacement reaction?

• Drake+ Chris Rihanna---> Rihanna Drake + Chris

• Drake+ Rihanna Brown---> Drake Riahnna Brown

• Drake+ Rihanna Brown---> Chris Drake + Rihanna

• I have no idea

Multiple Choice

Predict the products of this reaction: Al₂(SO₄)₃ + Ca₃(PO₄)₂ --->

• This reaction will not occur

• Al(PO₄) + Ca(SO₄)

• Al₂Ca₃ + (PO₄)₂(SO₄)₃

• Al₂(SO₄)₃ + Ca₃(SO₄)₃

Multiple Choice

Propane is burned with a blue flame

• propane + oxygen --> carbon dioxide + water

• propane + carbon dioxide --> oxygen + water

• propane + oxygen --> carbon monoxide + water

Multiple Choice

All combustion reactions are

• endothermic

• exothermic

• neutral

• fast

Multiple Choice

Another term for burning is

• Fire triangle

• Magnesium oxide

• Combustion

• Bustion

Multiple Choice

Milk turning sour is a _____.

• physical change

• chemical change

Multiple Choice

In a chemical change, how does the mass of the reactants compare to the mass of the products?

• The mass of the products is always greater than the mass of the reactants.

• The mass of the reactants is always greater than the mass of the products.

• The mass of the reactants is always equal to the mass of the products.

• It depends on the specific chemical change.

Multiple Choice

Is respiration an Endothermic or an Exothermic reaction?

• Endothermic

• Exothermic

Multiple Choice

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

• The temperature changed

• It is an endothermic reaction

• It is an exothermic reaction

• Two of the answers are correct

Multiple Choice

In an endothermic reaction, heat is ...

• taken in

• given out

Multiple Choice

In an exothermic reaction, heat is ...

• taken in

• given out