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CP Chemistry Midterm
Midterm Reviews Chapter 1-3
| Question | Answer |
|---|---|
| What is the formula for percent error? | [(Experimental-actual value)/actual] x 100 |
| What is chemistry? | the study of matter and the changes it can undergo |
| What is the unit for mass? | gram |
| What is the unit for volume? | milliliter (mL) or liter (l) |
| What is the energy carried by moving objects? | kinetic energy |
| What name a unit of energy used in the metric system? | calorie |
| What does the Law of conservation of mass state? | In any process, energy is neither created nor destroyed |
| Name 3 changes in state of matter | melting, boiling, freezing, evaporating, condensing (etc) |
| What kind of changes are crushing, cutting, boiling, melting? | physical chenges |
| What is an element? | a substance that cannot be separated into simpler substances by a chemical change |
| What is a compound? | a substance that contains two or more elements that are chemically combined in a fixed raio |
| Name 3 physical properties of matter. | density, mass, melting point, color, texture (etc.) |
| What is an atom? | the smallest particle of an element that retains both the physical and chemical properties of an element |
| Who stated that all atoms of the same element are always identical? | Dalton |
| The mass of a neutron is equal to the mass of what other subatomic particle? | proton |
| Which of the 3 subatomic particles has the smallest mass? | electron |
| What is the charge of an electron? | negative |
| What is the charge of a proton? | positive |
| What is the charge of a neutron? | neutral |
| Which subatomic particles are located in the nucleus? | protons and neutrons |
| An element has an atomic number of 46. How many protons and electrons are there in a neutral atom? | 46 protons and 46 electrons |
| What does the sum of protons and neutrons equal? | mass number |
| How do isotopes of the same element differ? | number of neutrons |
| When writing a nuclear symbol, what is the in upper left corner? | mass number |
| When writing a nuclear symbol, what is the lower left corner? | atomic number |
| The atomic number of an element is the number of what subatomic particle? | proton |
| What is the mass number of an atom that has 15 protons and 17 neutrons? | 32 |
| What is the charge of an atom that loses two electrons? | +2 |
| What is the charge of an atom that gains 3 electrons? | -3 |
| What is the charge of an atom when protons and electrons are equal? | neutral |
| What is the charge of an atom that gains 3 electrons? | -3 |
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ssuriano
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