Chemical reactions

Is this a chemical or physical change?

• Chemical

• Physical

• Neither

Is this reaction endothermic or exothermic?

• endothermic

• exothermic

• Neither

In this chemical reaction what are the products?

• Wax, fire, oxygen

• Hot gas, Smoke and ash

• Fire

• Wax, smoke, ash

It is easier to keep food fresh in a refrigerator, why is this?

• It keeps bad air out.

• The low temperature increases particle motion.

• The low temperature decreases particle motion.

• Their is a special light in the fridge that kills bacteria.

Sasha uses an axe to chop up some wood, changing its shape is this a chemical or physical change?

• Physical

• Chemical

• Neither

What is something that always happens during a chemical reaction?

• New substance is made

• Bonds are broken or changed in a molecule

• the change of reactant substances into product substances

• All of the other answers

Which type of mixture is this?

• Heterogeneous

• Homogeneous

• Compound

• Pure substance

We can remove iron from smushed up cereal, why is that?

• Substances in mixtures keep their own individual properties like magnetism.

• The iron is so heavy that it falls out of the mixture.

• The cereal acts as a glue, and once we make it wet and soggy, it will release the metal.

• Magic homie, get on my level

After ten taco bell tacos, mike starts to notice he is releasing large amounts of gas. Why is that?

• Food digestion is a physical reaction, and gas is an indicator of that.

• Food digestion is a chemical reaction, and gas is an indicator of that.

• Taco bell has to much spices and it was to hot for him

• He drank too much soda, and it is releasing gas in his belly.

Why does bread cook faster in a hotter oven?

• Higher temperature increases the rate of chemical reaction.

• The heat makes the bread go through a physical change faster.

• The crustiness of bread is dictated by the amount of air in the oven.

• It does not cook faster.