Vocabulary
Define: solute a. a chemical combination of two or more substances. b. a solid solution consisting of two or more metals c. takes up space and has mass d. material that is dissolved into a solution (smaller portion)
What is d. material that is dissolved into a solution (smaller portion)-the larger portion is the solvent.
Define: chemical and physical change.
What is Chemical: when one or more substances change into new substances. Physical: when the identity of substances does not change.
A substance made by mixing other substances together is a ______________.
What is mixture (for example-brass)
T/F: Solids have a definite shape and volume.
What is True
List some examples of physical properties:Behavior of matter and it's characteristics.
What is color change, size change, shape change, melting point.
Define: compound a. a chemical combination of two or more substances. b. a solid solution consisting of two or more metals c. takes up space and has mass d. material that is dissolved into a solution (smaller portion)
What is a. a chemical combination of two or more substances. (ie: carbon dioxide)
ID if chemical or physical change: Ice melting
What is physical
A _________________ mixture is even throughout
What is homogeneous (heterogeneous-not uniform or evenly distributed throughout).
T/F: Sugar is a compound.
What is True-sugar is carbon, oxygen, and hydrogen
Laundry detergent, soda, clean air are all examples of a? a. solute b. solution c. compound d. homogeneous mixture
What is d. homogeneous mixture
Define: matter a. a chemical combination of two or more substances. b. a solid solution consisting of two or more metals c. takes up space and has mass d. material that is dissolved into a solution (smaller portion)
What is c. takes up space and has mass
ID if chemical or physical change: burning
What is chemical (changing color is a chemical property too)
T/F: Elements can be broken down into simpler forms.
What is False
Calculate the density on a substance that has 150 mL and .045 g?
What is density= g/mL (you calculate density with the formula d=m / v) density = mass divided by volume.
Name the law that states that matter can neither be created nor destroyed in a chemical change.
What is Law of conservation of mass
Define: alloy a. a chemical combination of two or more substances. b. a solid solution consisting of two or more metals c. takes up space and has mass d. material that is dissolved into a solution (smaller portion)
What is b. a solid solution consisting of two or more metals
ID if chemical or physical change: rusting
What is chemical
Sugar is a __________ because you can break it down into different elements. a. solute b. solution c. compound d. homogeneous mixture
What is c. compound (it is also a pure substance)
T/F: A coca-cola is a heterogeneous mixture
What is False-homogeneous (even mixed throughout)
Explain the difference between an exothermic and endothermic reaction.
What is Exothermic is a chemical reaction that gives off energy and an endothermic reaction takes in energy (usually from heat). Endo=melting ice cubes. Exo=combustion
A _____________ _____________ can be observed only when there is a change in COMPOSITION of a substance.
What is chemical property
ID if chemical or physical change:Magnetizing metal
What is physical
Salt in the ocean is a __________ because it is the smaller portion that dissolves in a larger portion. a. solute b. solution c. compound d. homogeneous mixture
What is a. solute
Calculate the density of a metal that is 18.5 grams and displaced in 2.5 mL of water.
What is (d=m/v) =7.4 g/mL
What happens when iron rusts, and what type of reaction is it?
What is "The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide."