Chemistry Mid-Term
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What is 3,456 km expressed in scientific notation? -CORRECT ANSWER 3.456 x 10³
km (move decimal behind first 1-9 number, add power number of places moved)
How many significant figures are there in the measurement 0.000000345 -CORRECT
ANSWER three (don't count leading zeros)?
What is the quantity 345 milligrams expressed in grams? -CORRECT ANSWER 0.345 g
(there are 1000 mg in 1 g, divide by 1000 or move decimal 3 to left)
What is the purpose of using significant figures in the science lab? -CORRECT
ANSWER to determine the precision of measurement
What is the easiest instrument to use to measure volume? -CORRECT ANSWER
graduated cylinder
What are important safety rules to follow when working with open flames? -CORRECT
ANSWER Do not leave lighted burner unattended, tie back hair, avoid wearing loose
clothing
Perform the following calculation to the correct number of significant figures.
2.00 cm x 0.0040 cm = -CORRECT ANSWER .0080 cm² (give CORRECT ANSWER in
2 sig figs, because least precise number had 2 sig figs)
Known mass is 4.40 g. Data was 2.20,2.21,2.20,2.21,2.20. The data reflects - -
CORRECT ANSWER Low accuracy and high precision.
What type of change is tearing a piece of paper? -CORRECT ANSWER Physical
change
What type of changes are explosion, food spoilage, and corrosion? -CORRECT
ANSWER Chemical changes
What type of change is rusting? -CORRECT ANSWER Chemical change
, What type of changes are boiling, sublimation, and dissolving? -CORRECT ANSWER
Physical changes
What type of mixture is soil? -CORRECT ANSWER heterogeneous (looks different)
What type of mixtures are Kool-Aid, and Gatorade? -CORRECT ANSWER
homogeneous (looks same)
What type of mixture is salt water? -CORRECT ANSWER homogeneous (looks same)
What type of mixtures are raisin bread; tossed salad; sand and water? -CORRECT
ANSWER heterogenous (looks different)
What are some evidences that a chemical change has occurred? -CORRECT
ANSWER Change in color, production of a gas, change in smell, change in
temperature, a solid forms (precipitate), production of light
When a change in state, (like liquid to gas or solid to liquid), occurs, is this evidence of a
chemical change? -CORRECT ANSWER no
What mass of sodium chloride would be produced if 10 grams of sodium reacted
completely with 20 grams of chlorine? -CORRECT ANSWER 10 + 20 = 30 grams, due
to Law of Conservation of Mass
What is each vertical column of the elements in the periodic table called? -CORRECT
ANSWER group or family
What is each horizontal column of the elements in the periodic table called? -CORRECT
ANSWER period
What state of matter has a definite volume and takes the shape of its container? -
CORRECT ANSWER liquid
What state of matter has a definite volume and shape? -CORRECT ANSWER solid
What state of matter has no definite volume and no definite shape? -CORRECT
ANSWER gas
What is the term describing the process of a gas changing to a solid? -CORRECT
ANSWER deposition
What is the term describing the process of a solid changing to a gas? -CORRECT
ANSWER sublimation
The phase change from gas to liquid is called -CORRECT ANSWER condensation
Exam||Latest Exam
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What is 3,456 km expressed in scientific notation? -CORRECT ANSWER 3.456 x 10³
km (move decimal behind first 1-9 number, add power number of places moved)
How many significant figures are there in the measurement 0.000000345 -CORRECT
ANSWER three (don't count leading zeros)?
What is the quantity 345 milligrams expressed in grams? -CORRECT ANSWER 0.345 g
(there are 1000 mg in 1 g, divide by 1000 or move decimal 3 to left)
What is the purpose of using significant figures in the science lab? -CORRECT
ANSWER to determine the precision of measurement
What is the easiest instrument to use to measure volume? -CORRECT ANSWER
graduated cylinder
What are important safety rules to follow when working with open flames? -CORRECT
ANSWER Do not leave lighted burner unattended, tie back hair, avoid wearing loose
clothing
Perform the following calculation to the correct number of significant figures.
2.00 cm x 0.0040 cm = -CORRECT ANSWER .0080 cm² (give CORRECT ANSWER in
2 sig figs, because least precise number had 2 sig figs)
Known mass is 4.40 g. Data was 2.20,2.21,2.20,2.21,2.20. The data reflects - -
CORRECT ANSWER Low accuracy and high precision.
What type of change is tearing a piece of paper? -CORRECT ANSWER Physical
change
What type of changes are explosion, food spoilage, and corrosion? -CORRECT
ANSWER Chemical changes
What type of change is rusting? -CORRECT ANSWER Chemical change
, What type of changes are boiling, sublimation, and dissolving? -CORRECT ANSWER
Physical changes
What type of mixture is soil? -CORRECT ANSWER heterogeneous (looks different)
What type of mixtures are Kool-Aid, and Gatorade? -CORRECT ANSWER
homogeneous (looks same)
What type of mixture is salt water? -CORRECT ANSWER homogeneous (looks same)
What type of mixtures are raisin bread; tossed salad; sand and water? -CORRECT
ANSWER heterogenous (looks different)
What are some evidences that a chemical change has occurred? -CORRECT
ANSWER Change in color, production of a gas, change in smell, change in
temperature, a solid forms (precipitate), production of light
When a change in state, (like liquid to gas or solid to liquid), occurs, is this evidence of a
chemical change? -CORRECT ANSWER no
What mass of sodium chloride would be produced if 10 grams of sodium reacted
completely with 20 grams of chlorine? -CORRECT ANSWER 10 + 20 = 30 grams, due
to Law of Conservation of Mass
What is each vertical column of the elements in the periodic table called? -CORRECT
ANSWER group or family
What is each horizontal column of the elements in the periodic table called? -CORRECT
ANSWER period
What state of matter has a definite volume and takes the shape of its container? -
CORRECT ANSWER liquid
What state of matter has a definite volume and shape? -CORRECT ANSWER solid
What state of matter has no definite volume and no definite shape? -CORRECT
ANSWER gas
What is the term describing the process of a gas changing to a solid? -CORRECT
ANSWER deposition
What is the term describing the process of a solid changing to a gas? -CORRECT
ANSWER sublimation
The phase change from gas to liquid is called -CORRECT ANSWER condensation
