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Chemistry Unit Review
Test Description: Unit review covering NC standard 8.P.1
Instructions: Answer all questions to get your test result.
1) What does the number above the symbol for each element represent?
A
# of protons in an atom
B
The sum of protons and electrons in an atom
C
The sum of protons and neutrons in an atom
D
# of neutrons in an atom
2) Which is an indicator of a chemical reaction?
A
Change in mass
B
Change in temperature
C
Change in size
D
Change in shape
3) Which is the best describes the result of a chemical reaction?
A
Heat is always absorbed
B
Heat is always released
C
The mass of the product is greater than the mass of the reactant
D
The mass of the reactants is equal to the mass of the products
4) What do we have to know about an element to reproduce it synthetically?
A
Who discovered the substance
B
Chemical formula of the substance
C
Solubility of the substance in water
D
Where the substance is found
5) Na is a highly reactive metal, Cl is a poisonous gas, table salt is made of both. Why is table salt safe to eat?
A
When elements combine, they produce a mixture
B
When elements form compounds, their chemical properties change
C
One element is an acid and the other a base
D
One element’s electrons balance out the other’s electrons
6) Which element is most likely germanium (Ge)?
A
Carbon
B
Boron
C
Iron
D
Hydrogen
7) Why is Carbon MOST like germanium (Ge)?
A
Carbon and germanium have the same number of valence electrons
B
Carbon is found in the same faimly/group as germanium
C
Carbon and germanium have the same number of neutrons
D
Carbon is found in the same period as germanium
8) Insecticides kill insects and may affect human health. Why are they most likely still used?
A
They are easily removed from food
B
They reduce resistance to fungi
C
They increase crop yields
D
Their found in nature
9) How do covalent bonds form?
A
Atoms gain or lose protons
B
Atoms share protons
C
Atoms gain or lose electrons
D
Atoms share electrons
10) Which atomic properties best describe an atom of cobalt (Co)?
A
27 protons, 27 electrons, 32 neutrons
B
59 protons, 27 electrons, 31.93 neutrons
C
58.93 protons, 27 electrons, 27 neutrons
D
27 protons, 27 electrons, 27 neutrons
11) Why is copper most likely used more often than gold in electrical wiring?
A
Copper is a better conductor
B
Copper has a lower density
C
Copper is less ductile
D
Copper has a higher specific heat
12) Which best describes a solution?
A
Compound; can be separated by physical means
B
Compound; can be separated by chemical means
C
Mixture; can be separated by physical means
D
Mixture; can be separated by chemical means
13) Triclosan and bleach kill bacteria. Why is only Triclosan in hand soap?
A
Triclosan moisturizes skin
B
Triclosan is a color enhancer
C
Triclosan contain fragrance
D
Triclosan is a less harsh chemical
14) What is the charge of just the nucleus of an atom?
A
Neutral; equal number of electrons and protons
B
Positive; protons are present
C
Positive; equal number of electrons and neutrons
D
Neutral; neutrons are present
15) A student pours hydrochloric acid into the flask and puts the zinc in a balloon, puts the balloon on the flask and lets the zinc fall into the flask. Bubbles form, the balloon expands and the flask heats up. Which of the following statements is true?
A
This is a chemical change because there was a precipitate formed in the way of gas.
B
This is a physical change because the zinc and hydrochloric acid made gas.
C
This is a chemical change because the zinc and hydrochloric acid made gas.
D
Bubbles forming is an example of a physical change.
16) Zinc is normally silver. After the experiment, the zinc was black. Why did the zinc turn black?
A
The metal was burned
B
New compounds formed during the reaction
C
A leftover residue stained the surface
D
The shiny surface was corroded away by the acid
17) What will most likely increase the rate of bubble formation?
A
Using less zinc
B
Diluting the HCl
C
Cooling the HCl
D
Using powered zinc
18) A medicine is a sleeping pill but if pregnant women take it, her fetus is a great risk to birth defects. Which statement is most accurate?
A
Fetuses have a low threshold level for this medicine
B
This medicine is a pathogen in fetuses
C
Fetuses have a high threshold level for this medicine
D
This medicine is a carcinogen in fetuses
19) What occurs in every chemical reaction?
A
Elements are broken
B
Atoms are destroyed
C
Elements are created
D
Atoms are rearranged
20) Why are elements in group 18 most likely called the noble gases?
A
They form the most expensive compounds
B
They are named for the scientist who discovered them
C
They are the only gaseous atoms found in nature
D
They have complete valence shells
*select an answer for all questions
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