Chemistry Exam 1 study guide part 1
A container of yogurt weighs 85 grams. How many kg is that?
0.085 kg
a researcher needed three samples of sodium chloride solution each with a volume of 0.03510ml the total volume needed should report a
0.1053ml
what is the correct answer for calculations 32*0.12345/5.67
0.69672
What is the metric relationship between grams and micrograms?
1 g = 1,000,000 μg
The specific gravity of a solution is 1.18. Its density is
1.18 g/mL.
According to the United States Food and Drug Administration, the recommended daily requirement of protein is 44 g. This is __________ oz of protein.
1.6
The boiling point of water on the Celsius scale is ________ °C.
100 °C
How many centimeters are there in 57.0 in?
145 cm
What is the correct answer for the calculation of a volume (in mL) with measured numbers 28.58/16*8.02
14ml
A conversion factor set up correctly to convert 15 inches to centimeters is
2.54 cm/1 inch.
Which of the following examples illustrates a number that is correctly rounded to three significant figures?
20.0332 grams to 20.0 grams
Perform the following calculation using measured numbers: (6.912 × 48) ÷ 12.9
25.72
How many liters of soft drink are there in 5.25 qt?
4.97l
what is the name of 53ml of ethanol, which has density of 0.79g/ml?
42g
42 is what percent of 70?
60%
Which of the following measurements are NOT equivalent?
84cm=8.4mm
Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?
balsa wood (density = 0.16 g/mL)
An abrasive used in toothpaste is _
calcium carbonate
The ratio of the mass of a substance to its volume is its
density
Which of the following is a physical change?
dry ice subliming
Helium is a(n)
element
32 °F is the same temperature as 100 °C.
false
A μg is larger than a mg.
false
In the number 123.45, the digit 5 is in the hundreds place.
false
The basic unit of mass in the metric system is the pound.
false
When -7 is added to -5 the answer is 12.
false
calcium carbonate is used to sweetened toothpaste
false
The energy associated with the motion of particles in a substance is called
heat
coins in a piggy bank is a
heterogeneous mixture
Identify the place value for the underlined digit in the following value 265.984. the highlighted number is 8
hundredths
Which of the following is a measurement of mass in the metric system?
kilogram
The energy of motion is referred to as
kinetic energy
A value of 345 mm is a measure of
legnth
Identify the following statement as a step in the scientific method: When sodium chloride, common table salt, is added to water the boiling point increases.
observation
You notice that there is more traffic between 8 and 9 in the morning. This would be a(n) ________.
observation
Which of the following does NOT involve a change of state?
pouring water into a vacuum insulated bottle
In this list, which substance can be classified as a chemical?
salt
Chemistry is the study of the composition, properties, and reactions of matter. Chemistry is also the study of the ________________________ of matter
structure
A value of 25 °C is a measurement of
temperature
Which of the following does NOT represent a step on the heating curve of water?
temperature of steam cannot exceed 100 decrease celcius
Absolute zero is
the coldest temperature possible.
The specific heat of copper is 0.0920 cal/g °C, and the specific heat of silver is 0.0562 cal/g °C. If 100 cal of heat is added to one g of each metal at 25 °C, what is the expected result?
the silver will reach a high temperature
Black coffee is a homogeneous mixture.
true
Carbohydrates and proteins have the same caloric value per gram.
true
The liter is a unit of volume in the metric system.
true
When a liquid is boiling, its temperature does not change.
true
the number 650,000 has two significant figures
true
Raising the temperature of 10.0 g of water from 10.0 °C to 20.0 °C requires 100.0 cal of energy, while raising the temperature of 10.0 g of aluminum from 10.0 °C to 20.0 °C requires 22 cal. More calories are required to heat the water because
water has a large specific heat than aluminum
the measurement of the gravitational pull on an object is its
weight*****
