WorksheetsSTAAR: Chemistry Review #1
Total questions: 20
Worksheet time: 17mins
Name
Class
Date
1.
Which of the following properties uniquely identifies every element?
a)
Number of valence electrons
b)
Phase at room temperature
c)
Number of protons
d)
Charge of the atom
2.
An elements reactivity and other chemical properties are determined by the number of….
a)
isotopes it has.
b)
oxidation states
c)
orbitals in an atom.
d)
valence electrons
3.
Molybdenum has an atomic number of 42. This means that molybdenum...
a)
has a freezing point of 42 degrees Fahrenheit.
b)
belongs to Group 42 on the Periodic Table.
c)
Can form 42 bonds with other atoms.
d)
contains 42 protons in its nucleus.
4.
Which of the following properties of carbon distinguishes it from all other elements?
a)
Carbon has 6 protons in its nucleus.
b)
Carbon is a gray solid at room temperature.
c)
Carbon forms compounds with oxygen.
d)
Carbon can be found in Earth's crust.
5.
Based on this table it can be concluded that
a)
Sodium is the most reactive
b)
strontium is the best conductor
c)
phosphorous is the least stable
d)
aluminum has the most protons
6.
Which pair of elements have the same number of valence electrons?
a)
Lithium and Beryllium
b)
Magnesium and Sodium
c)
Lithium and Sodium
d)
Magnesium and Lithium
7.
What do elements in group 1 have in common?
a)
Number of valence electrons
b)
Melting point of the element
c)
Possible number of bonds formed
d)
Metallic characteristics of the element
8.
Which element would have similar properties to Sulfur?
a)
Nitrogen
b)
Oxygen
c)
Flourine
d)
Chlorine
9.
Which of the following statements is true….
a)
A period is another name for a row
b)
Elements in the same period share similar physical properties
c)
Elements in the same period have the same number of energy shells surrounding the nucleus
d)
All of the above
10.
I which location on the Periodic Table are nonmetals found?
a)
Location 1
b)
Location 2
c)
Location 3
d)
Location 4
11.
a)
2
b)
4
c)
6
d)
8
12.
a)
A
b)
B
c)
C
d)
D
13.
a)
A
b)
B
c)
C
d)
D
14.
a)
A
b)
B
c)
C
d)
D
15.
According to the Law of Conservation of Mass,
a)
matter is always created in a chemical reaction.
b)
matter is always destroyed in a chemical reaction.
c)
matter is created and then destroyed in a chemical reaction
d)
matter is not created or destroyed in a chemical reaction.
16.
How many oxygen products are listed in the chemical equation below,
2Mg + O2 ------> 2MgO
2Mg + O2 ------> 2MgO
a)
0
b)
1
c)
2
d)
4
17.
In which of the following examples has a chemical reaction occurred?
a)
After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.
b)
After turning on a blender filled with fruits, the fruit is chopped up and mixed together.
c)
After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.
d)
After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.
18.
When vinegar and baking soda are combined, bubbles begin to form. Bubbles are evidence of a chemical reaction because they -
a)
pop when they are touched.
b)
show that a gas is forming.
c)
form at a fast rate.
d)
are generally transparent.
19.
In an experiment, two flasks of unknown, clear liquids are combined in a beaker and the following observations are obtained: •Solution color remains clear.
•The amount of solution in the beaker increased.
•Solution temperature changed from 10°C to 20°C.
•Some of the liquid remained in the flasks.
How many of the listed observations indicate a new substance was formed?
•The amount of solution in the beaker increased.
•Solution temperature changed from 10°C to 20°C.
•Some of the liquid remained in the flasks.
How many of the listed observations indicate a new substance was formed?
a)
1
b)
2
c)
3
d)
4
20.
An experiment is performed in which a crystalline substance is added to a beaker filled with room temperature water. The following observations are made:
I. The crystals dissolve
II. A precipitate is formed.
III. The bottom of the beaker feels warm to the touch.
IV. Bubbles begin forming within the water.
All of the observations are evidence of a chemical change EXCEPT –
I. The crystals dissolve
II. A precipitate is formed.
III. The bottom of the beaker feels warm to the touch.
IV. Bubbles begin forming within the water.
All of the observations are evidence of a chemical change EXCEPT –
a)
observation I.
b)
observation II.
c)
observation III.
d)
observation IV.
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