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PS Midterm
Physical Science Midterm
| Question | Answer |
|---|---|
| What is the correct name for the formula CO? | Carbon Monoxide |
| What type of reaction occurs in the following equation? C+Cl2-> CCl2 | Synthesis |
| The atomic number of an element is always equal to the ____. | number of protons |
| The atomic mass is equal to the number of protons plus the number of _____. | neutrons |
| What kind of reaction occurs within the sun when two nuclei UNITE (come together) to form one nucleus? | nuclear fusion |
| The Big Bang Theory states that which two elements were created first? | Hydrogen and Helium |
| Which subatomic particle orbits the nucleus? | electrons |
| A statement about what happens in nature that seems to be true all of the time is a _____. | Scientific Law |
| The variable that could change because of the independent variable is the _____. | dependent variable |
| The variable that YOU change or manipulate is the _____. | Independent variable |
| The correct format for writing a testable hypothesis is.... | If (IV), then (DV) will (prediction). |
| What are some examples of physical changes? | water boiling, painting a house, crushing a can |
| What are some examples of chemical changes? | baking a cake, iron rusting, photosynthesis |
| The state of matter that has a definite shape and volume and forms a pattern of vibrating molecules. | solid |
| The state of matter that has no definite shape or volume and expands to fill space it is in. | Gas |
| The subatomic particle with a positive electrical charge found in the nucleus of an atom. | proton |
| On a periodic table, what is the atomic number equal to? | number of protons |
| If the atomic number of an atom is 15 and the number of neutrons is 16, then the number of electrons is ____. | 15 (same as the protons) |
| Elements that have properties of both metals and nonmetals are called ____. | metalloids |
| Which group on the Periodic table is known as the Noble Gases? | Group 18 (8 Valence electrons) |
| In the periodic table, elements in the same Group or Family have the same ____. | number of valence electrons |
| Group 17 on the Period Table that includes the elements Fluorine, Chlorine, Bromine, and Iodine is called the _____. | Halogens (7 valence electrons) |
| What is used to represent a chemical compound? | Chemical formula (Shows the element and the number of atoms of each) |
| The Law of Conservation of ______ states that matter cannot be created or destroyed. | Mass (equal atoms of each element on each side of a chemical equation) |
| What is formed when an atom gains or loses electrons in order to become stable? | An Ion (+ or - charge) |
| What is it called when an atom has the same number of protons as another atom, but a different number of neutrons? | Isotope |
| When a chemical reaction gives off energy (Heat) as a product, it is called a (n) ____reaction. | exothermic |
| When a chemical reaction takes in heat as a reactant, it is a (n) _____reaction. | endothermic |
| When a solute (like kool-aid) dissolves in a solvent (like water), it forms a _____. | solution |
| Substances with a pH less than 7 are considered _____. | Acids |
| Substances with a pH greater than 7 are considered _____. | Bases |
| Compounds that change to different colors in acidic or basic solutions are called _____. | Indicators (ex. litmus paper, phenolphthalein, methyl orange) |
| The formula for density. | D=M/V Mass=g Volume=mL or cm3 |
| In drawing a Bohr model, how many electrons can fit in each orbital (electron shell)? | 1st shell= 2 2nd shell= up to 8 3rd shell= up to 18 |
| What is the chemical formula for Sodium sulfide? | First write the symbols with their oxidation numbers. Na+1 S-2 Then, drop the +- charge and criss cross. Na2S |
| What is the name of the compound MgF? | Magnesium Flouride (write the metal first, change nonmetal to -ide) |
| Is the following equation balanced or not? If not, balance it. __NaBr + __Cl2 ---> __NaCl + __Br2 | Not balanced 2 NaBr + Cl2 ----> 2 NaCl + __Br2 |
| Which family of elements is the least reactive on the periodic table? (means they are more likely to combine with other elements) | The Noble Gases are the least reactive because they have a full set of 8 valence electrons. They do not need to combine with other elements. |
| Which type of bond would be formed between a metal (+) and a nonmetal (-) that need to receive or donate electrons? | Ionic Bond |
| Which type of bond would be formed between two nonmetals sharing electrons? | Covalent Bond |
Created by:
kbordelon2
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