Science Chapter Twelve: Changes in Matter Changes In Matter Chemical Reactions Chemical Technology Chemical Properties

Changes in Matter 100 Define a physical change.

Changes in Matter 100 Answer Physical changes include changing the –Position –Size –Shape –Volume –State of matter

Changes in Matter 200 Give an example of a physical change.

Changes in Matter 200 Answer Examples of physical changes could include –Crumpling or tearing a piece of paper –Throwing a ball –Freezing water into ice –Blowing up a balloon

Changes in Matter 300 Define a chemical change.

Changes in Matter 300 Answer In a chemical change, the substance changes into a completely different kind of matter.

Changes in Matter Part 400 Fill in the blank: In a chemical change, the _______ in the reactants rearrange to form different products.

Changes in Matter 400 Answer In a chemical change, the atoms in the reactants rearrange to form different products.

Changes in Matter 500 Give an example of a chemical change.

Changes in Matter 500 Answer Examples of chemical changes may include: –Rust forming on iron –An Alka-Seltzer tablet dissolving in water –Heating iron and sulfur together to form iron sulfide

Chemical Reactions 100 The substances used in a chemical change are called ____________, and the substances formed at the end are called _______________.

Chemical Reactions 100 Answer The substances used in a chemical change are called reactants, and the substances formed at the end are called products.

Chemical Reactions 200 The “sentence” below is an example of what? 2H 2 0  2H 2 + O 2

Chemical Reactions 200 Answer That is a chemical equation.

Chemical Reactions 300 Describe what happens to the atoms in each of these types of chemical reactions: –Combination –Decomposition –Replacement

Chemical Reactions 300 Answer In a combination reaction, atoms in the reactants combine to form a different product. In a decomposition reaction, atoms in the reactants split apart to form different products. In a replacement reaction, at least one reactant’s atoms split apart and rearrange with another reactant’s atoms to form different products.

Chemical Reactions 400 Name two ways you can tell if a chemical reaction has occurred (what evidence is there?)

Chemical Reactions 400 Answer Evidence of a chemical reaction includes: –Change of color –Formation of a solid –Formation of a gas –Heat, light, and/or electrical energy are given off

Chemical Reactions 500 What is the Law of Conservation of Mass?

Chemical Reactions 500 Answer The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction. The total mass of the products will equal the total mass of the reactants.

Chemical Properties 100 The process of burning is called ________________.

Chemical Properties 100 Answer The process of burning is called combustion.

Chemical Properties 200 Give one example of how chemical properties can be used to separate mixtures.

Chemical Properties 200 Answer Vinegar can be used to dissolve limestone around fossils. Heating carbon with iron ore can separate the metal from the rock.

Chemical Properties 300 How does a flame test work?

Chemical Properties 300 Answer In a flame test, chemicals are burned and can be identified by the different colors of flame.

Chemical Properties 400 Give an example of an acid that you could find around your house.

Chemical Properties 400 Answer Household acids include: –Vinegar –Coke –Orange Juice –Lemon Juice

Chemical Properties 500 This special paper turns red in acids and purple in bases (and colors in between, too!). What’s that paper called?

Chemical Properties 500 Answer Indicator paper.

Chemical Technology 100 Medicines (some that originally came from mold) that kill bacteria are called _____________.

Chemical Technology 100 Answer Medicines (some that originally came from mold) that kill bacteria are called antibiotics.

Chemical Technology 200 Scientists discovered that certain chemicals in foods could prevent illness and help people stay healthy. Those chemicals are called ____________.

Chemical Technology 200 Answer Scientists discovered that certain chemicals in foods could prevent illness and help people stay healthy. Those chemicals are called vitamins.

Chemical Technology 300 Some chemicals are added to the soil to help farmers grow more crops. These chemicals are called ____________.

Chemical Technology 300 Answer Some chemicals are added to the soil to help farmers grow more crops. These chemicals are called fertilizers.

Chemical Technology 400 Nylon and plastic are both examples of polymers. What is a polymer?

Chemical Technology 400 Answer A polymer is large molecule made of many smaller molecules linked together (like a chain).

Chemical Technology 500 We get gasoline, motor oil, and some plastics from the chemicals found in ________________.

Chemical Technology 500 Answer We get gasoline, motor oil, and some plastics from the chemicals found in petroleum.