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Chemistry Unit Test
| Question | Answer |
|---|---|
| A water molecule (H20) is an example of a covalent bond because _________. | Electrons are shared between the hydrogen and oxygen. |
| Ionic bonds for between what types of elements? | Metals and Nonmetals |
| Covalent bonds form between what types of elements? | Nonmetals and Nonmetals |
| How many atoms are in NH3? (Know how to calculate this... don't expect the same molecule on the test.) | 4 (There is 1 nitrogen and 3 hydrogen atoms) |
| Look at your "mouse periodic table..." (you will be allowed to use this on the test as well) Which of the below elements will most likely form a covalent bond? a) K and Na b) Na and Cl c) H and O | c) Hydrogen and oxygen because they are both nonmetals. |
| Look at your "mouse periodic table..." (you will be allowed to use this on the test as well) Which of the below elements will most likely form an ionic bond? a) Na and Cl b) H2O c) CH4 | a) Sodium (Na) and Chlorine (Cl) (They form an ionic bond because 1 is a metal, and the other is a nonmetal.) |
| An atom that has a charge because it has gained or lost an electron is called a(n) ________? | ion |
| What is matter? | Everything around us is matter. Matter is anything that has mass and occupies space. There are 3 different states of matter - solid, liquid, and gas. Matter is made up of many atoms. |
| What is an atom? | All matter is made up of atoms, which are made of protons, neutrons, and electrons. Atoms cannot be created nor destroyed, but can be rearranged. |
| What is a molecule? | A molecule is 2 or more atoms bonded together. Molecules come in many shapes and sizes. |
| What is a covalent bond between atoms? | In a covalent bond, the atoms are joined together by shared electrons. |
| What is mass? | Mass is the amount of matter in an object. (Even though it is usually measured in grams (g) or kilograms (kg), it is NOT the same as weight because weight depends on gravity - you'd weigh less on the moon, BUT you'd have the same mass.) |
| Can you create H2O, CH4, and NH3 molecules just like the molecule worksheets? I emailed a key to 2 of these to co-teachers on October 3rd. At least one of these will be on the test. You'll need to use your element cards, so don't forget to bring them! | Hopefully the answer is yes, but if not... practice and study those keys. :-) |
| Science is a _______________________ way to study the world in which we live. | systematic |
| Science as ideas is called ______________________. | philosophy |
| Science as observation includes the various scientific ___________________, such as chemistry and biology. | disciplines |
| Science as invention is called __________________________. | technology |
| Step 1 of the scientific method | making observations |
| Step 2 of the scientific method | forming a hypothesis |
| Step 3 of the scientific method | perform experiment |
| Step 4 of the scientific method | collect results |
| Step 5 of the scientific method | draw conclusions |
| Interpreting scientific _____________ is an important part of scientific investigation, and can be the cause of many arguments. | data |
| Chemistry is the study of the ______________ that makes up the physical world. | matter |
| By doing quality ________________________, early scientists were able to show that the basic unit of matter is the _____________. | atom |
| All things, both living and nonliving, are made of atoms, which are also called _________________. | elements |
| Atoms are made of ____________________, __________________, and ____________________. | protons, neutrons, and electrons |
| In a neutral atom, the number of _________________ equals the number of electrons. | protons |
| To find the number of ________________, round the atomic weight to the nearest whole number, and subtract the number of protons (atomic number) | neutrons |
| All elements are found in the _________________ __________________. | periodic table |
| The central core of an atom is called the ___________________. | nucleus |
| The _________________________ ________________________ are the ______________________ in the outer shell that can participate in forming chemical bonds with other atoms. | valence electrons, electrons |
Created by:
jgordon.lpa
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