Chemistry A unit 1 Practice Test
How close a measurement is to its true value is its ___.
accuracy
What is the name for a unit that is selected to be standard for a certain type of measurement?
base
Complete the following Table of Standard Measurements and SI units: Definition Measurement Base unit amount of matter contained in an object ___________ kilogram length of events and the duration of the interval between two events ____________ second average kinetic energy of the particles of a substance temperature _________ number of units, such as atoms, molecules, or ions, of which all matter is made particles of matter __________ the flow of electrons passing a particular location in a given point of time electric current ___________ amount of brightness of a light source luminous intensity _________
mass time kelvin mole ampere candela
___ are occurrences observable in nature.
phenomena
How close a series of measurements are to each other is ___.
precision
_______facts or pieces of information that can be expressed as an amount or a quantity ________facts or pieces of information that can be observed by the senses _____something that can change or be changed ______a standard used for comparison _____a visual, verbal, or mathematical representation designed to explain a natural phenomenon _____an orderly method for observing nature and making predictions ______a possible explanation for an observation, phenomenon, or scientific problem that can be tested through experimentation ______an organized procedure for conducting a controlled, measurable, and repeatable test or investigation _______a hypothesis that has been confirmed many times by experimental data with no exceptions ______a simple, factual, and precise statement that describes an action or set of actions
quantitative data qualitative data variable control scientific model scientific method hypothesis experiment scientific theory scientific law
A unit is a specified ___ with which any other quantity of the same kind is measured.
quantity
All the known digits in a measurement, plus one estimated last digit, are ___ figures.
significant
The definition of derived unit is:
unit formed when other units are combined
The U.S. Navy and the British Navy are doing joint training exercises in the Mediterranean. Both navies are practicing firing missiles at a target, but their firing velocities don't match. US missiles travel at 640 miles per hour. The British need to match the velocity of the US missiles, but their speed is measured in meters per second. What must the British velocity be to match the US missile velocity at 640 mph? Begin by converting miles to kilometers. (1.0 mile = 1.6 km)
280m/s
Perform the indicated calculation. You may use a calculator. Remember to round your answers according to the rules for significant figures 374km/12h
31 km/hr
Perform the indicated calculation. You may use a calculator. Remember to round your answers according to the rules for significant figures. 138.2km x 3.5km
480km'2
Perform the indicated calculation. You may use a calculator. Remember to round your answers according to the rules for significant figures. 3250cmx0.550cm
1790 cm'2
Perform the indicated calculation. You may use a calculator. Remember to round your answers according to the rules for significant figures. 25000cm x 500 cm
12,500,000cm'2
Perform the indicated calculation. You may use a calculator. Remember to round your answers according to the rules for significant figures. 25 025kg/ 22m'3
1100 kg/m'3
