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studystack for science
| Question | Answer |
|---|---|
| density equation | D=m/v |
| mass equation | m=D x V |
| volume equation | v=m/D or L x W x H |
| percentage error equation | percentage error= |Observed value-true value|/true value X 100 |
| What are the two types of mixtures? example? | heterogeneous and homogeneous. Heterogeneous ex: sand Homogeneous ex: air |
| homogeneous mixture | The substances involved in a homogeneous mixture are so evenly mixed that you can't see the different parts. It is difficult to separate the parts of a homogeneous mixture. |
| heterogeneous mixture | In a heterogeneous mixture you can usually see the different parts and they can be easily separated out |
| matter | Anything that has mass and takes up space |
| chemistry | the study of matter and how matter changes |
| substance | a single kind of matter that's pure meaning it always has a specific makeup or composition |
| physical property | a characteristic of a substance that can be observed without changing it into another substance |
| chemical property | a characteristic of a substance that describes its ability to change into different substances |
| What degree celsius does water boil and freeze at? | Water boils at 100 degrees celsius and freezes at 0 degrees celsius |
| element | a substance that cannot be broken down into any other substances by chemical or physical means |
| atom | The basic particle from which all elements are made |
| chemical bond | the force of attraction that holds two atoms together. In many cases atoms combine to form larger particles called molecules |
| molecule | a group of two or more atoms held together by chemical bonds |
| compound | a substance made of two or more elements that are chemically combined in a set ratio. A compound is represented by a chemical formula |
| chemical formula | symbols that show the elements in the compound and ratio of atoms |
| mixture | two or more substances that are together in the same place but their atoms are not chemically bonded |
| weight | a measure of the force of gravity on you |
| mass | the amount of matter in an object which does not change with location even if the force of gravity changes |
| kilogram | the SI unit of mass |
| volume | the amount of space that matter occupies |
| cubic meter (m^3) | The SI unit of volume |
| density | a measure of the mass of a material in a given volume |
| physical change | Alters the form or appearance of matter but does not turn any substance in the matter into a different substance |
| chemical change | A change in matter that produces one or more other substances |
| law of conservation of mass | the fact that matter is not created or destroyed in any chemical or physical change. also called the law of conservation of matter since mass is a measurement of matter |
| temperature | a measure of how hot or cold something is |
| thermal energy | the total energy of motion of all the particles in an object |
| endothermic change | a change in which energy is absorbed. An example is the melting of ice |
| exothermic change | a change in which energy is released. Combustion is a chemical change that releases thermal energy and Light |
| chemical energy | the energy stored in the chemical bonds between atoms |
| What does every form of matter have | Matter is described by its properties. Every form of matter has two kinds of properties, physical properties and chemical properties. Physical and chemical properties are used to classify matter |
| How do you separate a mixture into its parts | Since the substances in a mixture keep their properties you can use properties to separate a mixture into its parts. Methods used to separate the parts of a mixture include distillation, evaporation, filtration, and magnetic attraction. |
| Matter occurs in three familiar states | solid liquid and gas |
| A substance that undergoes a physical change is still the ( ) after the change | same substance |
| What's the difference between a physical and a chemical change | unlike a physical change a chemical change produces new substances with new and different properties while a physical change does not turn into a new substance |
| Every chemical and physical change in matter includes a change in ( ) | energy |
| How are matter and energy similar | Like matter, energy is conserved in a chemical change. Energy is never created or destroyed. It can only be transformed from one form to another |
| are temperature and thermal energy the same thing | Temperature and thermal energy are not the same thing, but the amount of thermal energy an object has is related to its temperature. Thermal energy naturally flows from warmer matter to cooler matter |
| Three examples of physical properties of matter | Electrical conductivity, density, melting point, magnetism, texture, hardness, color, temperature, state of matter |
| three examples of chemical properties of matter | Radioactivity, corrosion, tarnish, flammability, rusting, oxidizing |
| three indicators of physical change | Crushing, tearing, ripping, cracking, cutting, breaking, mixing, melting, boiling |
| three indicators of chemical change | burning, exploding, rusting, cooking, digesting, combusting, toasting |
| what is the center of an atom called | the nucleus |
Created by:
emilybinderiya