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MJHS 7 Unit 2
Unit 2 Test Study Physical and Chemical Changes of Matter
| Question | Answer |
|---|---|
| The study of matter and its changes is called | Chemistry |
| A specific type of atom with its own properties is a(n) | Element |
| Two or more atoms bonded together in a specific ratio is called a(n) | Compound |
| The smallest unit of a substance that is made up of 2 or more elements is called a(n) | Molecule |
| Substances that are combined physically, but not chemically are said to be | Mixtures |
| A well mixed mixture in which particles cannot be seen is a | Solution |
| A change that does not produce a new substances is called a | Physical change |
| When new substances are formed, this type of change has occured. | Chemical change |
| Sometimes, during a chemical reaction between two liquids, a solid is formed witin the liquids. This solid suspended in the liquid is called a | Precipitate |
| The smallest unit of matter is called the | Atom |
| Smoke, fire, bubbling and change of color are all evidence of this. | Chemical change or reaction |
| Dissolving, mixing or breaking a substance is evidence of this. | Physical change |
| Color, density, boiling point and state of matter are all these types of properties. | Physical |
| Flammability, reactivity and combustibility are all these types of properties. | Chemical |
| A sentence showing a chemical change with symbols is called a | Chemical equation |
| During a chemical reaction, this cannot be created or destroyed. | Matter |
| The large number present in front of the molecule symbol is called the | Coefficient |
| The small number that is sometimes present next to and slightly below the element symbols is called the | Subscript |
| This number tells the number of molecules | Coefficient |
| This number tells the number of atoms | Subscript |
| What word does the arrow stand for in a chemical reaction sentence? | Yields |
| When hydrogen peroxide breaks down into water and oxygen gas, this type of reaction has occured. | Decomposition |
| When hydrogen gas and oxygen gas come together to make water, this type of reaction has occured. | Synthesis |
| When the copper in copper sulfate trades places with the iron in a nail, this type of reaction has occured. | Replacement |
| The three parts of the fire triangle are oxygen, heat and | Fuel |
| What part of the fire triangle do firefighters try to remove first? | Heat |
| A solution is a well mixed: | Mixture |
| The part of the solution that does the dissolving is the | Solvent |
| The part of the solution that gets dissolved is the | Solute |
| In Kool Aid, what is the solute? | Kool Aid Powder Mix |
| This substance is sour, corrosive and has a pH of 6 or less. | Acid |
| This substance is bitter, slippery and has a pH of 8 or higher. | Base |
| Fruits are usually classified as | Acids |
| Soaps and cleaning products are usually classified as | Bases |
| Which is a stronger base, milk or bleach? | Bleach |
| Which is a stronger acid, HCl or fruit juice? | HCl |
| Which pH is neutral? | 7 |
| The pH scale is actually a measure of the concentration of | Hydrogen ions |
| The higher the pH, the lower the number of | Hydrogen ions |
| The lowest pH possible is | Zero |
| The highest pH possible is | Fourteen |
| The dense solid core of an atom is called the | Nucleus |
| The positively charged part of the atom | Proton |
| The smallest subatomic particle is the | Electron |
| The neutral particle in the nucleus | Neutron |
| Who was the first to suggest an atomic model? | Dalton |
| His gold foil experiment proved the atom was mostly empty space | Rutherford |
| His plum pudding model showed both positive and negative parts of the atom. | Thomson |
| His model shows the atom model much like a solar system with orbiting electrons. | Nagaoka or Bohr |
| This number on the periodic table corresponds to the number of protons | Atomic number |
| This number on the periodic table corresponds to the number of protons plus the number of neutrons | Atomic mass |
| Scandium (Sc) is atomic number 21 and has an atomic mass of 45. How many protons does scandium have? | 21 |
| Scandium (Sc) is atomic number 21 and has an atomic mass of 45. How many neutrons does scandium have? | 24 |
| A vertical column of elements on the periodic table is called a | Group or familiy |
| A row of elements on the periodic table is called a | Period |
| How many families are there? | 18 |
| How many periods are there? | 7 |
| Helium and neon are both examples of | Noble gases |
| Lithium and sodium are both examples of | Alkali metals |
| Calcium and magnesium are both examples of | Alkaline earth metals |
| The largest group of elements on the periodic table are the | Transition metals |
| Elements found along the stair step line are the | Metalloids |
| These elements are non metals that LOVE to bond with family 1 elements. | Halogens |
| These metals react violently with water. They can even burst into flames IN the water. | Alkali metals |
| How many NAMED elements are there? | 112 |
| Who is the father of the periodic table? | Mendeleev |
Created by:
erica.sprague
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