CHM 101- EXAM #1

weight
The measurement of the gravitational pull on an object is its
calcium, phosphorus, oxygen, hydrogen
What elements are in hydroxyapatite, Ca5(PO4)3OH, a major compound in human bones and teeth?
energy
The phrase “ability to do work” is a definition of
The temperature of steam cannot exceed 100 degrees C
Which of the following does NOT represent a step on the heating curve of water?
nitrogen
Which of the following elements is a nonmetal?

-silver
-nitrogen
-calcium
-sodium
-iron

424
A calculator answer of 423.6059 must be rounded off to three significant figures. What answer is reported?
the coldest temperature possible
Absolute zero is
4.3 x 10^-6m
The measurement 0.0000043 m, expressed correctly using scientific notation, is
three
How many significant figures are there in the number 0.00208?
kilogram
Which of the following is a measurement of mass in the metric system?
liter
The metric unit for volume is the
the accuracy of the conversion factor
Significant figures are important because they indicate
germanium
Identify the metalloid in the following list.

-silver
-copper
-germanium
-fluorine
-sulfur

temperature
A value of 25 degrees C is a measurement of
pouring water into a vacuum-insulated bottle
Which of the following does NOT involve a change of state?
burning sugar
Which of the following is a chemical change?
the same atomic number but different number of neutrons
Isotopes are atoms of the same element that have
has randomly arranged particles
Which of the following is a physical property of both liquids and gases?
water stored in a resevoir
Which of the following is an example of potential energy?
Ca
What is the symbol of the element in period 4 and group 2?
running water
An example of kinetic energy is
potential energy
The energy stored in the chemical bonds of a carbohydrate molecule is
evaporation
The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as
strontium
Which of the following elements is a metal?
balsa wood (density = 0.16 g/mL)
Which of the following will float in gasoline, which has a density of 0.66 g/mL?
very large relative to the size of molecules
In a gas, the distance between the particles is
all protons and neutrons
In an atom, the nucleus contains
homogeneous mixture
Air is a(n)
density
The ratio of the mass of a substance to its volume is its
1000 kilocalories
The dietary calorie (Cal) is equal to how many kilocalories?
movement of the Earth closer to the sun
Global warming is believed to result from all of the following EXCEPT
1.18 g/mL
The density of a solution is 1.18 g/mL. Its specific gravity is
elements
The primary substances of which all other things are composed are
element
Helium is a(n)
are unreactive and are rarely found in combination with other elements
The Group 8A(18) elements
6.8 x 10^8
The number 68000000.0 expressed correctly using scientific notation is
dry ice subliming
Which of the following is a physical change?
Electrolysis- zap water with electricity to get 2 volume of hydrogen and 1 volume of oxygen
Explain how you would separate pure water into its component parts.
Use a chromatography stick- the components will travel at different rates up the paper
Explain how you would separate black in into its component parts.
x

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