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Matter And Atoms
Test Description: Atoms, Isotopes, Solubility, Acids and Bases
Instructions: Answer all questions to get your test result.
1) A substance that turns litmus paper blue will have a pH _____________ 7.
A
greater than
B
fewer than
C
equal to
D
less than
2) Acids...
A
taste bitter and have lots of OH- ions
B
taste bitter and have lots of H+ ions
C
taste sour and have lots of H+ ions
D
taste sour and have lots of OH- ions
3) Highly concentrated NaOH has a pH of 13. How could it be classified?
A
Weak acid
B
Strong acid
C
Weak base
D
Strong base
4) If a substance turns litmus paper RED the substance is ...
A
a base and has a pH below 7
B
an acid and has a pH above 7
C
a base and has a pH above 7
D
an acid and has a pH below 7
5) Which of the following is a way to increase the rate of solubility of a solution?
A
Let it sit by itself without stirring
B
Use a whole sugar cube instead of crushing it
C
Use colder water
D
Stir it
6) If a substance is SOLUBLE in water...
A
the substance will not mix with water or milk.
B
the substance will not dissolve in water.
C
the substance will dissolve in water.
D
the substance will not dissolve in milk.
7) Sterling silver is an alloy of silver that consists of 92.5% pure silver and 7.5% copper. Which metal is the solvent?
A
silver
B
tin
C
lead
D
copper
8) Sterling silver is an alloy of silver that consists of 92.5% pure silver and 7.5% copper. Which metal is the solute?
A
lead
B
silver
C
copper
D
tin
9) Air is comprised of about 78% Nitrogen, 21% Oxygen, and less than 1% other gases. In a sample of clean air, what would the solvent be?
A
All of them
B
Nitrogen
C
Oxygen
D
Other gases
10) Unsaturated solutions are identified on a solubility curve by determining if the solution's point is...
A
above the line
B
higher than the line
C
below the line
D
on the line
11) What is the universal solvent?
A
vinegar
B
salt
C
olive oil
D
water
12) In the isotope named Lithium-7, the 7 represents which piece of information?
A
the mass number
B
the number of protons
C
the atomic number
D
the number of neutrons
13) What is the difference between a pure substance and a mixture?
A
Pure substances are not chemically combined like mixtures.
B
Pure substances are physically combined.
C
Mixtures are not chemically combined like pure substances
D
Mixtures are chemically combined.
14) When you add so much solute that no more dissolves because you have reached the maximum amount that can be dissolved, you have created a ____________ solution.
A
saturated
B
monosaturated
C
supersaturated
D
unsaturated
15) How many protons are there in an atom of gold?
A
25
B
47
C
89
D
79
16) Which element has 12 protons in its atom?
A
Carbon
B
Sulfur
C
Aluminum
D
Magnesium
17) Which two subatomic particles do you add together in order to determine the mass of the atom?
A
proton and neutron
B
electron and proton
C
proton and electron
D
neutron and electron
18) How many neutrons are located in the nucleus of a sodium-23 atom?
A
23
B
11
C
12
D
13
*select an answer for all questions
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