Physical and Chemical Changes

Which best explains a physical change

• a change that completely changes the substance, and this new substance has different properties

• a change that results in a new size, shape, or state or matter. The substance does not change

Which best explains a chemical change

• a change that completely changes the substance, and this new substance has different properties

• a change that results in a new size, shape, or state or matter. The substance does not change

Chocolate is left outside in the hot sun and it begins to melt. What change has now taken place?

• chemical change because it made a new substance

• physical change because the substance is still the same, it just had a change of state (solid to liquid)

Which one is a physical change

• spoiling food

• breaking glass

• bleaching your hair

• spoiled milk

Which one is a chemical change

• cutting grass

• vinegar and baking soda reacting

• ice cream melting

• boiling water

What is a precipitate?

• a new solid that has formed as the result of a chemical reaction

• a gas that has formed as the result of a chemical reaction

• a substance going from a solid to a gas

Which is an example of a precipitate?

• clumps forming in spoiled milk

• a mixture of chocolate and peanuts in a cup

• breaking glass

Which is NOT a chemical change

• a rusting bike

• melting butter

• fireworks exploding

• frying an egg

Which is not a physical change

• frying an egg

• chocolate melting in the sun

• cutting grass

• breaking a table in half

Which best explains the Law of Conservation of Mass

• mass is not created or destroyed, what you have in the beginning is what you end with

• volume (amount of space) does not change when you alter a substance

• a physical change changes the amount of mass an object has

• a chemical change changes the amount of mass an object has