Chemical Reactions Unit Study Guide
CR1- I can define chemical and physical properties.
1) Identify the following as either a chemical or physical property of matter: color, luster,
flammability, hardness, density, combustibility, reactivity, conductivity, and malleability.
2) Does the size of a sample ever change the samples physical properties? Explain and give an
example.
3) What is the density of water? When will an object float in water? When will an object sink
in water?
CR2- I can use physical properties to identify unknown substances.
4) Metal X has the following physical properties: Color- silver, Luster- high, Hardness- 7.2,
Density- 5.4 g/mL, Conductivity- high. Which of the following unknowns would most likely
be Metal X?
Unknown #1= Color- silver, Luster- medium, Hardness- 7.6, Density- 4.4 g/mL, Conductivityhigh.
Unknown #2= Color- yellow, Luster- low, Hardness- 6.8, Density- 5.3 g/mL, Conductivitynone.
Unknown #3= Color- silver, Luster- high, Hardness- 7.1, Density- 5.1 g/mL, Conductivityhigh.
CR3- I can define element, molecule, compound, reactant and product.
5) Explain an element in your own words and give an example.
6) Explain molecule in your own words and give an example.
7) Explain compound in your own words and give an example.
CR4- I can differentiate between compounds and elements.
8) Identify the following as element, compound or molecule: KBr, KOH, Ti, N, C8, SO4, Fe3,
Fe3OH
9) What is the rule for identifying elements?
10) What is the rule for identifying compounds?
11) What is the rule for molecules?
CR5- I can list the signs of a chemical reaction.
12) What are the five signs of a chemical reaction?
13) Make a saying or song to help you remember the five signs.
CR6- I can explain what occurs during a chemical reaction.
14) You need to be able to explain what occurs during a chemical reaction so write the following
three times: A chemical reaction creates/produces a new substance. This new substance
has different properties than the starting substances. The materials that react or that are
started with are reactants and the materials that get made or end with are products. The
products will always be different than the reactants in a chemical reaction.
CR7- I can use data on properties of matter before and after they interact to determine if a chemical
reaction occurred.
15) What happens to the properties of reactants after they have been involved in a chemical
reaction and create a new product?
16) Be able to look at properties of reactants and products and determine if a chemical reaction
has occurred or not and also explain how you know.
CR8- I can explain solids, liquids and gases at the atomic level.
17) Draw a solid, liquid and gas at the atomic level. Under each of the drawings write the
following phrases that go with that state of matter: Very rigid, Moves freely, Enough room
to change places, Sometimes arranged in a crystalline formation, low kinetic energy,
medium kinetic energy, high kinetic energy, definite volume, definite shape, No definite
volume, no definite shape.
CR9- I can explain and apply the law of conservation of matter.
18) Be able to answer questions like the open response question that we did. Read your answer
to the open response and make changes until it is a 3. Write what the law of conservation of
matter says (Matter cannot be created or destroyed) and how it is applied to chemical
reactions, specifically reactants and products (if there are 150g of reactants there has to be
150g of products). Make 5 questions up for this learning target and quiz yourself.
CR10- I can explain exothermic and endothermic reactions.
19)
20)
21)
22)
What is an exothermic reaction?
Where does the heat energy that is released during an exothermic reaction come from?
What is an endothermic reaction?
Where does the extra energy that goes into the products of an endothermic reaction come
from?