test review for unit 1

Name _____________________________
Date _____________ Period _____
Academic Chemistry - Test 1 Review
General Information Using the choices provided, fill in the blanks below by circling the correct answer(s):
____ changes are changes in which the identity of a substance does not change. Thus the changes of state are
____ changes. (physical, chemical); (physical, chemical)
In a ____ change, the identities of substances change and new substances form. (physical, chemical)
In the equation H2 + O2  H2O, hydrogen is a ____ and water is a ____. This is an example of a ____ change.
(reactant, product); (reactant, product); (physical, chemical)
A ____ reaction rearranges the atoms that make up the reactant or reactants. After a chemical reaction, the ____
atoms are present in the product or products. Atoms ____ destroyed or created, so mass ____ change during a
chemical reaction. (physical, chemical); (same, different); (are, are not); (does, does not)
Chemical changes sometimes produce a gas, which you can detect by observing ____ or by a change in ____.
(bubbles, a precipitate); (color, odor)
When two clear solutions mix and a precipitate forms, the mixture becomes ____. (clear, cloudy).
A color change in a reaction system, such as when an indicator changes color, may indicate that a ____ reaction
has occurred and ____ substances have formed. (chemical, physical); (new, no new)
Give the chemical symbol or name for the following elements: (make sure to know all 20)
8. Ca
9. Magnesium
10. What should be worn at all times when there is danger to the eyes? __________________
11. What should happen to all loose clothing and long hair? __________________________________
Scientific Notation
12. Express the following in scientific notation: 423000000 _____________________________________
13. Express the following in standard notation: 3.7 x 10 -5 _________________________________
States of Matter
14. Which state has indefinite shape and indefinite volume? _____________________________
15. Diagram the arrangement of particles in the 3 states of matter.
Physical and Chemical Properties and Changes
16. Indicate whether the following describes a Physical (P) or Chemical (C) property:
a) iron rusts in the presence of oxygen ________
b) a piece of iron shot has a mass of 0.5 g ________
c) Joe’s shirt is blue _______
17. Indicate whether the following describes a Physical (P) or Chemical (C) change:
a) an oak log is thrown on a campfire and burns _________
b) a hot dog is digested _________
c) sugar and tea are dissolved into a pitcher of water ____
Classification of Matter
18. Pure substances can be both ___________________ and ______________________.
19. Indicate whether the following are Elements (E), Compounds (C) or Mixtures (M).
a) sodium bicarbonate ________
b) tungsten ________
c) german chocolate cake ________
20. Indicate whether the following mixtures are Homogeneous (HO) or Heterogeneous (HE).
a) chocolate chip cookie ________
b) stainless steel ________
c) banana nut bread _______
Density and Measurements
21. What is the formula for density? __________________
22. What are the units for the following measurements? Mass____ Volume____ Length____
23. What is the density of an object with a mass of 10 g and a volume of 5 mL?
24. Which object is more dense, assuming they have the same mass?
25. If a substance has a density of 25 g/mL, what volume would 5 g of this substance occupy?
26. Convert: 4.3  1024 atoms of phosphorus to grams
27. How many moles are in a 7 gram sample of boron?
28. Convert: 250 mL to kL