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9 weeks test

QuestionAnswer
Chemistry is best defined as the study of all substances and the changes that they can undergo
Chemistry has been called the central science because it Overlaps so many sciences
A tentative or suggested answer to a question, formulated before experimentation is called a Hypothesis
The factor being tested in an experiment is called the Theory
An idea that describes how nature behaves but does not explain why nature behaves in the way it does is called the Natural Law
In science, a properly formulated hypothesis Must always be able to be tested
Responds in a predictable way to the experiment An experimental control
SI base unit for mass Kilogram
SI base unit of volume is the Cubic meter
The abbreviation for millimeter mm
kelvin, volt, and ampere are all SI units
The liter is a non-SI unit of volume
The prefix kilo makes the unit larger or smaller? Larger
How many liters are there in a cubic meter? 1000
A graduated cylinder is an instrument used for what? to measure liquid volume
a plus sign with a line under it expresses what? uncertainty of measurement
A recorded measurement has two certain digits and one estimated digit. How many significant digits does the measurement have? Three
In multiplication and division of measured values, the measured value that determines the number of significant digits in the answer is the one that has the Smallest number of significant digits
How should you round off a number that ends with the digit 5? Round up
How many significant figures are in the number 2.005? 4
What is 2.5 x 10 to the negative 4 power in normal notation 0.00025
How many significant figures are there in 1.9800? 5
Warns you that it is dangerous to breathe vapors from this substance and that you should not let the substance come in contact with your skin? skull on the bottle symbol
Reminds you never to touch your face or eyes during a laboratory investigation hand under a fosset symbol
Warns you to tie back long hair and loose clothing fire symbol
Indicates that you should use a wafting motion fume hood flames coming out of a cylinder symbol
Indicates that you need to get directions from your teacher about disposing of chemicals cylinder with a diamond on it
A number written in scientific notation is made up of the significant digits of the original number and 10 written with an exponent
The percent error is equal to 100 percent multiplied by measured value - accepted value / accepted value
Density is equal to mass/volume
Dimensional analysis is a technique of converting between units
Conversion factor to convert grams to kilograms 1 kg/1000 g = 1
In a graph, the variable that ranges along the horizontal, or x, axis is the independent variable
The capacity to do work is called energy
What is the SI unit of energy joule
The amount of heat needed to raise the temperature of 1 gram of water by 1 celsius degree is called a calorie
In any process, energy is neither created nor destroyed is a statement of the law of conservation of energy
Anything that has mass and volume is called matter
Burning is not a change in state
Density is a physical property
Crushing is a physical change
A substance that cannot be separated into simpler substances by a chemical change is called an element
A substance that contains two or more elements chemically combined in a fixed proportion is called a compound
Pure substances include Elements and compounds
Element symbols consist of one or two letters
CO is the formula of a compound
A blend of two or more pure substances is called a mixture
Created by: ska
 

 



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