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Chemistry Ch. 1
| Question | Answer |
|---|---|
| Atoms combine to form? | molecules |
| Scientific laws describes... | HOW nature behaves |
| A scientific law can be proven... | over and over |
| A good hypothesis is ____meaning it makes predictions that can be confirmed or refuted by further explanations. | falsifiable |
| The Law of Conservation of Mass states: | matter is neither created or destroyed |
| We call a specific instance of matter a ___ | substance |
| What are the characteristics of a solid? | fixed volume, tightly packed and rigid shape |
| A pure substance is either an ___ or ___ | element or compound |
| A mixture is | 2 or more substances that are not chemically combined |
| An element is a substance that | cannot be broken down into anything simpler |
| What is a compound? | 2 or more chemically combined elements |
| When the mixture looks the same throughout, this is called a ____ | homogeneous mixture |
| A heterogeneous mixture is a mixture that____ | looks different throughout (you can see the different particles) |
| What is decanting? | separating a solid from a liquid by carefully pouring off liquid |
| Volatile means ____ | easy vaporizable |
| Matter can be broken down into what 2 categories? | A pure substance and mixture |
| A mixture can be ____ or _____ | homogeneous / hertergoneous |
| A property that changes when the size of the sample changes is a ____. | extensive property |
| Examples of an extensive property are: | mass, volume and length |
| An intensive property: | doesn't change when you take away some of the sample |
| Temperature, color, hardness, melting point, and density are examples of an ___ property | intensive property |
| Pouring a mixture through a filter paper to separate the solid from the liquid is called___ | fifltration |
| Distillation is a process where ___ | liquids are boiled offf |
| Unit for length: | meter (m) |
| Unit for mass: | kilogram (kg) |
| Unit for time: | second |
| Unit for amount of subtsance: | mole (mol) |
| With a physical change, the ___ changes, the substance does not | appearance |
| In a chemical change, the ____ change | substance |
| How close a particular measurement is to the correct value is the ____ | accuracy |
| Precision is: | the consistency of repeated measurement |
| The more consistent the results, the more ____ the measurement is | precise |
| Numbers are not significant when: | 1. they are leading zeros 2. zeros at the end of a number doesn't have a decimal point |
| The more digits, the __ certainty | more |
| The less digits, the __ certainty | less |
| Numbers that have NO certainty are called: | exact numbers |
| An error that tends to be too high or too low are called: | systematic errors |
| given unit x desired unit/given unit = | desired unit |
Created by:
Mariahj25
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