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Chemistry Test 3
Chemistry Chapter 4&5 review
| Question | Answer |
|---|---|
| Dalton's atomic theory states that all atoms are identical. | False |
| Dalton's atomic theory states that a chemical reaction involves either the union or separation of individual atoms. | True |
| Dalton's atomic theory states that atoms are composed of protons, electrons, and neutrons. | False |
| Dalton's discoveries provided physical explanations for reactions that could be expressed in quantitative terms. | True |
| Dalton's atomic theory states that all matter is made up of tiny atoms. | True |
| Dalton's atomic theory states that atoms can be created and/or destroyed. | False |
| Neutrons carry no charge and are located in the nucleus of the atom. | True |
| Protons and electrons are found in the nucleus of the atom. | False |
| Neutrons determine the nuclear reactivity of an atom. | False |
| The proton and electron have opposite electrical charges. | True |
| Protons determine the chemical reactivity of an atom. | False |
| All atoms of an element have the same number of electrons. | False |
| The atomic number is found on the periodic table. | True |
| The mass number represents the number of protons. | False |
| The sum of the negative and positive integers in an atom is the charge. | True |
| The atomic number represents the number of the neutrons. | False |
| The mass number is found on the periodic table. | False |
| Isotopes are atoms of the same element that contain different numbers of neutrons. | True |
| Ions are atoms that carry a net charge. | True |
| Cations are ions that carry a negative charge. | False |
| What is the atomic number of an atom that has 15 protons? | 15 (Atomic number represents number of protons.) |
| If an atom has 18 protons and 18 electrons, what is the charge? | 0 |
| What is the mass number of an atom that has an atomic number of 8 and 9 neutrons? | 17 (protons plus neutrons) |
| If an atom has a charge of -2 and an atomic number of 7, how many electrons does it have? | 9 (because atomic charge equals protons minus electrons) |
| If an atom has an atomic number of 1 and a mass number of 4, how many neutrons does it have? | 3 (because mass number equals protons plus neutrons) |
| If an atom has a charge of +1 and 17 electrons, how many protons does it have? | 18 (because charge equals protons minus electrons) |
| If an atom has an atomic number of 19 and 16 electrons, what is the charge? | +3 (because charge equals protons minus electrons) |
| What is the mass number of an atom that has 5 protons and 10 neutrons? | 15 (because mass number equals protons plus neutrons) |
| 24/12Mg+2 has how many electrons? | |
| What is the atomic number of an atom that has 11 neutrons and a mass number of 20? | 9 (because mass number equals protons plus neutrons) |
| How many protons does an atom of carbon have? | 6 |
| If a sulfur atom has a mass number of 30, how many neutrons does it have? | 14 (because mass number equals protons [or atomic number] plus neutrons) |
| If an oxygen atom has 10 electrons, what is the charge? | -2 (because charge equals protons [or atomic number] minus neutrons) |
| What is the mass number of magnesium atom with 10 neutrons? | 22 (because mass number equals protons [or atomic number] plus neutrons) |
| If an atom has a charge of +1 and 5 protons, how many electrons does it have? | 4 (because atomic charge equals protons minus electrons) |
| What is the formula to find atomic charge? | Atomic charge = protons - electrons |
| What is the formula to find mass number? | Mass number = protons + neutrons |
| If an atom has an atomic number of 1, how many protons does it have? | 1 (because they are the same) |
| 7/3Li+1 has how many neutrons? | 4 |
| What is the atomic number of sodium? | 23 |
| What is the mass number of 40/19F-1? | |
| What is the charge of 12/6C? | |
| What is the atomic number of 40/18Ar? | 18 |
| If an atom has 8 protons and a mass number of 18, how many neutrons does it have? | 10 (because mass number = protons + neutrons) |
| 35/17Cl-1 has how many protons? | 17 |
| If an atom of neon is neutral, how many electrons does it have? | 10 (because neutral charge of 0 = protons - electrons) |
| If a fluorine has a charge of -1, how many electrons does it have? | 10 (charge = protons - electrons) |
| If an atom has 11 neutrons and a mass number of 18, how many protons does it have? | 7 (mass number = protons + neutrons) |
| What is the atomic number of an atom that has a charge of +3 and 10 electrons? | 13 (charge = protons - electrons) |
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