2.1 the SI System
Which prefix represents 10−1?
"Deci" is the SI prefix used to denote 10−1
The wavelength of a microwave is approximately 0.02meters. Write this quantity in centimeters.
0.02m=2×10−2m=2cm---> answer is 2cm
A power plant delivers about 21,000,000,000,000watts of electricity. Write this quantity in terawatts.
21,000,000,000,000W=21×1012W=21TW---> answer is 21
The prefix pico (p) means
A picometer is one trillionth of a meter, because pico means 10−12. The prefix for 106 is mega (M), the prefix for 10−3 is milli (m), and the prefix for 103 is kilo (k).
Which would NOT be an appropriate unit for density?
Density is an expression of mass per volume, and seconds are a unit of time, so this does not work for density.
Why is specific gravity a dimensionless quantity?
It has no units. The specific gravity for a substance is defined as its density divided by the density of a reference substance. Since both density quantities have the same units, the units cancel out in performing the calculation resulting in a dimensionless quantity.
Which statement BEST explains why temperature is an intensive property
It is a property that is independent of the amount of matter in a sample. Temperature is an intensive property because it is independent of the amount of matter for a given sample.
What is significant about the temperature of 0K?
It is the temperature at which atoms stop moving. A temperature of 0K is absolute zero and is the point at which motion of atoms stop.
What is the SI unit used to measure temperature?
Kelvin is the SI unit for measuring temperature. Joule is an SI unit, but is used to measure energy.
When determining significant figures within a number, non-zero digits are:
Non-zero digits are always considered to be significant, because they are part of a precise measurement.
Why is it important to use a standard system of measurement across all science disciplines?
So that scientists around the world can easily compare experimental results. Scientists use an international system of measurement and units so that they can easily compare their results and there is consistency.
An energy conversion is best defined as
The transformation of energy from one form to another.
In the Kelvin scale, 0 K
absolute Zero
What is the SI unit of "mole" used to measure
amount of a substance
Volume is the
space occupied by any sample of matter. Volume is the space that is occupied by any sample of matter. The meter is the SI unit for measuring distance or length, mass refers to the amount of matter in an object, and pressure is the force per unit area.
What is the proper formula for calculating specific gravity?
specific gravity=density of substance/ density of reference
What is the standard SI unit for volume?
the cubic meter
Which is an example of a compound?
Water is an example of a compound, as it is comprised of both hydrogen and oxygen. Hydrogen, mercury, and oxygen are all examples of elements.
If object A and object B have the same density, but object A has greater mass, then object A must have:
greater volume... If these objects have the same density, that means they have the same ratio of mass to volume, so a greater mass must also mean a greater volume.
What is the equivalent temperature on the Celsius scale for 0 K
−273.15∘C