Term
| Example of Physical Change |
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Definition
melting gold
sanding of a piece of wood
freezing of a fruit bar |
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Term
| If yousue an electric current you can split liquid hydrogen peroxide to form liquid water and oxygen gas. What type of change is this and why |
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Definition
| A chemical change because the matter is now different |
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Term
| Production of one or more substances is the only sure evidence that |
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Definition
| A chemical reaction has occurred |
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Term
| When a solid object with a density less than the density of water is placed in water what happens |
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Definition
| The object floats on top of the water |
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Term
| In a solid what do particles do |
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Definition
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Term
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Definition
| has neither a definite volume or a definite shape |
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Term
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Definition
| do not normally form chemical bonds because they have a full outer most energy level of electrons |
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Term
| This change of state requires a DECREASE in energy |
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Definition
| Condensation and freezing |
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Term
| This change of state requires a GAIN of energy |
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Definition
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Term
| As water vapor condenses into liquid water |
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Definition
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Term
| How do the properties of a compound compare with the properties of the elements that make up the compound |
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Definition
| all properties are different |
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Term
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Definition
| add the protons and neutrons |
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Term
| When two or more elements join together chemically what is formed |
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Definition
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Term
| When a metal and a non metal combine |
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Definition
| it forms an ionic compound and neutral compound |
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Term
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Definition
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Term
| Name the category of element that is the largest of the groups on the periodic table |
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Definition
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Term
| Every atom of a given element has the same number of these or it is not an element |
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Definition
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Term
| Most common elements in living things |
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Definition
| CHNOPS: Carbon, hydrogen, nitrogen, oxygen phosphorus, sulfur |
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Term
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Definition
| when atoms give, take or share electrons with other atoms at the atomic level |
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Term
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Definition
| the smallest particle into which an element can be divided and still have the properties of that element. |
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Term
| Nitrogen family has this amount of valence electrons |
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Definition
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Term
| When atoms gain electrons during chemical changes |
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Definition
| they aquire a negative charge as an ion |
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Term
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Definition
| The only part of the atom that make chemical bonds |
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Term
| Reason atoms are considered electrically neutral |
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Definition
| they have an equal number of protons and electrons |
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Term
| In a chemical reaction what happens to atoms |
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Definition
| they are never lost or gained just rearranged |
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Term
| New substances form during a chemical reactions |
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Definition
| chemical bonds break, atoms rearrange, new chemical bonds form |
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Term
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Definition
| when two atoms have the same number of protons but different numbers of neutrons |
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Term
| If you count the number of protons in an atom what does this determine |
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Definition
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Term
| If you subtract the mass number and the atomic number of an atom what have you calculated |
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Definition
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Term
| How many electrons and neutrons does Gallium have |
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Definition
| 31 electrons and 39 neutrons |
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Term
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Definition
| If it is brittle, dissolved easily in water, has a high melting point and conducts an electric current |
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Term
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Definition
| substances listed on the left side of the chemical equation |
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Term
| Atomic mass is a weighted average of the |
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Definition
| protons and neutrons found in the isotopes of that element |
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Term
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Definition
| the number of protons in one atom |
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Term
| You can find the number of electrons in an atom of an element by |
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Definition
| looking at the atomic number |
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Term
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Definition
| the elements in each vertical column have similar properties |
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Term
| What does the 12 on the periodic table for magnesium represent |
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Definition
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Term
| From left to right what order are the regions arranged on the periodic table |
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Definition
metals, metalloids, nonmetals, noble gases
MMNN |
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Term
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Definition
magnesium, calcium, brium
MCB |
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Term
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Definition
| name of the 3D pattern that forms when ions bond |
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Term
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Definition
| when a scientist heats mercury oxide in a beaker, beads of liquid mercury and oxygen are produced |
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Term
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Definition
| when you are at a constant temperature and you add so much solute that no more dissolves |
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Term
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Definition
| has an increased number of hydronium ions |
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Term
| four types of biochemicals in living organisms |
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Definition
Carbohydrates, proteins, nucleic acid, lipids
CPNL |
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Term
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Definition
| used to measure volumes of liquid in a lab |
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Term
| Number of bonds hydrogen can make with any element |
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Definition
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Term
| When red litmus paper turns blue in a solution |
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Definition
| it means the solution is a base |
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Term
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Definition
| when all of the molecules of a base dissociate in solution |
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Term
| reason carbon is central in chemistry of living things |
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Definition
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Term
| What happens to a solid object that is more dense than the density of water it is in |
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Definition
| the object will settle to the bottom of the water |
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Term
| When compared to carbon and oxygen, carbon dioxide is best described as having |
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Definition
| different chemical properties than either carbon or oxygen |
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Term
| If the melting point of butane is -138 and its boiling point is 0 C then |
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Definition
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Term
| A crystal lattice is formed from a repeating pattern of |
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Definition
| poitive and negative ions |
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Term
| The difference between an atom of gold (Au) and an atom of silver (Ag) is |
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Definition
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Term
| What charge will an oxygen atom have as an ion |
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Definition
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Term
| When atoms lose electrons during chemical changes, what charge do they acquire as an ion |
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Definition
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Term
| Freezing changes only the |
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Definition
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Term
| What is the chemical formula for magnesium fluoride |
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Definition
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