WorksheetsChem Test 1
Total questions: 24
Worksheet time: 24mins
Which of the following statements about determining the number of significant figures in a measurement are correct?
All nonzero digit are always significant
A zero counts as significant when it occurs at the beginning of a number
A zero does not count as significant when it occurs between two nonzero digits
A zero counts as significant when it occurs at the end of a number w/ a decimal point
Matter is anything that has ____.
Volume
Mass
None
Volume and Mass
Which statement applies to all chemical changes
Every chemical change will emit light
At the end of all chemical changes, a new substance is produced
All chemical changes have a change in the state of matter
Chemical changes always produce heat
Which of the following are correct unit conversion factors involving the gram?
1g/10^3 mg
1lb/454g
10^6ug/1g
1mg/10^3g
1g/10^3kg
Metric basic unit of length.
(a)
Metric basic unit of mass.
(a)
Metric basic unit of volume.
(a)
Which of the following units are possible units for density?
mg/dL
g/cc
kg/L
mL/g
cc/g
What statements correctly describes compounds?
Compound are formed by chemically combining two or more elements
All known compounds are listed on the periodic table
Compounds can be separated into elements by physical processes
Compounds are pure substances
Chemistry is the study of _____- it's composition, _____, and transformation.
(a)
A _____ change alters a substance without changing its composition, while a ____ change converts one material to another.
(a)
The base metric unit for mass is ____; there are approximately ____ of these in an English pound.
gram; 2.2
gram; 454
kilogram; 2.2
kilogram; 454
Density is correctly described as a ______.
Chemical change
Physical change
Chemical property
Physical property
Select all the statements that correctly describe elements.
Elements are pure substance
The known elements are listed on the periodic table
Elements can be converted into compounds through physical changes
Elements cannot be broken down into simpler substances through chemical changes
Select all the statements that correctly describe a mixture?
The composition of a mixture can vary depending on the sample
A mixture is composed of only one component
A mixture can be separated into its components by physical changes
Compounds are types of mixtures
Select all the statements that correctly describe a pure substance?
A pure substance is composed of a single component
A pure substance cannot be converted to other pure substances by any physical process
A pure substance has a constant composition
A pure substances are composed solely of elements
In solving unit conversion problems, the problem is set up so that all _____ will cancel
units
power of 10
numerical values
unwanted units
which of the following volumes are equal to one liter?
1 dm^3
1000 cm^3
10^9 nL
100 dL
10^-3 mL
The metric unit of volume is the ____, which has a volume equal to that of a cube measuring 10 ____ on each side
(a)
Specific gravity is a quantity ____
w/ unit of milliters
w/ units of grams per milliters
w/ unit of grams
w/o units
Why are units always used in measurements?
A number, e.g, a "length of 32", is meaningless w/o units
It has always been customary to include units, and so the practice has been continued
The use of units is a specific requirement of the metric system
An ____ number results from counting objects or is part of a definition, while an _____ number results from a measurement or observation and contains uncertainty.
(a)
On the Celsius temperature scale, water freezes at ___ C and boils at ____ C
(a)
What is the difference between the Kelvin scale and the Celsius scale
the zero point of the scale
the magnitude of the units
both the zero point and the unit magnitude
