A uniform combination of two or more pure substances can be classified as _____. Correct Answer-a homogeneous mixture
Which of these pure substances is an element?
- C12H22O11 (sucrose, table sugar)
- O2
- CH4 (methane, the primary component of natural gas)
- NH3 (ammonia, a component of f...
Chem 103 exam 1 Ch 1-3 Prelec/hw Questions with
Correct Answers
A uniform combination of two or more pure substances can be classified
as _____. Correct Answer-a homogeneous mixture
Which of these pure substances is an element?
- C12H22O11 (sucrose, table sugar)
- O2
- CH4 (methane, the primary component of natural gas)
- NH3 (ammonia, a component of fertilizer) Correct Answer-O2
Based on the organization of the periodic table, periods _____. Correct
Answer-are the horizontal rows
To which group and period does potassium belong? Correct Answer-1A,
4
In any measurement, the digits known with certainty plus one estimated
digit are called _____. Correct Answer-significant digits
The average diameter of a human cell is 0.000050 meters. How many
significant figures does this measurement contain? Correct Answer-2
,Cycling at a pace of 10-12 miles per hour burns 40 calories per mile.
How many miles would a cyclist have to ride at this pace to burn 120
calories? Correct Answer-3 miles
A doctor prescribes 2 tablets of acetaminophen every 4 hours for a fever.
Acetaminophen is available in 325mg325mg tablets. How many
milligrams of acetaminophen does the patient take with each dose?
Correct Answer-650 mg
On a spring break road trip, 3 friends drive 480 miles to the beach. If
their average speed is 60 miles per hour, how many hours did it take
them to reach their destination? Correct Answer-8 hours
Density is defined as the comparative ratio of a substance's _____.
Correct Answer-mass to volume
Which two states of matter have a definite volume? Correct Answer-
Solid and liquid
A Calorie is equivalent to 1000 calories Correct Answer-True
Which of the following statements is representative of a chemical
reaction?
Slicing the cake prior to serving it
Eating the cake
, Mixing flour, sugar, and salt to make a cake
Melting butter to put in the cake batter Correct Answer-Eating the cake
What is the coefficient of HClO4 when the following equation is
balanced with smallest whole numbers?Cl2O7 + H2O → HClO4
Correct Answer-2
You happen to be visiting Northern California and you are driving by
Suisun Bay, a notorious graveyard for old ships. You notice that all of
these ships appear to be rusting away. Which of the following statements
is true?
The rusting of the metal is neither a chemical change nor a physical
change.
The rusting of the metal is a chemical change.
The rusting of the metal is a physical change.
The rusting of the metal is both a chemical change and a physical
change. Correct Answer-The rusting of the metal is a chemical change.
Black ice is a thin layer of water on a sidewalk or road that has frozen
after the temperature has dropped below freezing. It is called black ice
because the ice is nearly invisible, especially when driving in a car at
night. Which of the following statements is true?
The formation of black ice is both a chemical change and a physical
change.
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