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Biology - Four
Biology - Chapter Four
| Question | Answer |
|---|---|
| Anything that takes up space is called | matter |
| The pull of gravity on the mass of a substance is known as | weight |
| The smallest part of an element that retains the properties of the element is the | atom |
| Each element has specific ________ that make it different from any other element | characteristics or properties |
| A substance madde of two or more kinds of atoms is a (an) | compound |
| An element is made of the same kind of | atoms |
| Each element has been given a symbol that begins with a _____ letter | capital |
| The symbol for sodium is | Na |
| All chemical activity depends on the structure of | atoms or atomic number |
| Atomic particles that have mass but no charge are called | neutrons |
| Negatively charged atomic particles are called | electrons |
| A charged atom is known as a (an) | ion |
| The number of protons in the nucleus of an atom is termed the | atomic number |
| Electrons occupy spaces called energy levels or | shells |
| The number above the element letter is called | atomic number |
| The number below the element letter is called | atomic mass |
| The second energy level of an atom is completed when it holds __________ electrons | 8 |
| A calcium atom has 20 protons in its nucleus. The total number of its electrons is | 20 |
| The electric charge on a neutron is | zero or neutral |
| The first energy level of an atom is completed when it holds ________ electrons | 2 |
| When two or more different kinds of atoms combinde chemically, the result is called a | compound |
| Atoms are held together by a force of attraction known as a | chemical bond |
| Carbon has an atomic number of 6. The number of electrons in the outer shell is | 4 |
| The amount of matter in a substance is known as | mass |
| The ability to do work is known as | energy |
| The building blocks of matter are invisible particles called | atoms |
| The smallest part of a compound that retains the properties of the compoundis a (an) | molecule |
| Water is a (an) | compound |
| The symbol for iron is | Fe |
| The center of an atomm is its | nucleus |
| Mass is properly defined as the pull on matter of | gravity |
| Charged particles that rotate around the nucleus of an atom are called | electrons |
| the atomic mass number of an element is obtained by adding together the number of | protons and neutrons |
| Isotypes of an element differ in the number of | neutrons |
| Of the following, a true statement about an atom is | an atom is electrically neutral |
| Most hydrogen atoms lack a (an) | neutron |
| A pair of shared electrons forms a (an) | covalent bond |
| The force that holds atoms together is known as a (an) | chemical bond |
| The number of known elements is approximately | 112 |
| The sodium ion is represented by the symbol | Na+ |
| In a chemical formula, each element is represented by its | chemical symbol |
| Covalent bonding occurs between atoms in | water |
| The proportions in which atoms combine are shown by numbers called | subscripts |
| Chlorine has an atomic number of 17. the number of electrons in its outer shell is | 7 |
| In a structural formula, the line between two atoms, as with C-C, represents a | covalent bond |
| A diatomic molecule consists of | 2 atoms of the same element |
| New substances formed as the result of a chemical reaction are known as | products |
| The smallest numbers of atoms in a compound are shown by a formula known as | empirical |
| Solids, liquids, and gases are collectively known as | matter |
| Hydrogen is best classified as an | element |
| Iron is made of the same kind of | atoms |
| The symbol for potassium is | K |
| Positively charged participles in the nucleus of an atom are | protons |
| The mass of a neutron is approximately __________ to the mass of a proton | equal |
| The word planetary is used to describe the behavior of | electrons |
| An atom is electrically | neutral |
| If an atom has 8 protons, it will have __ electrons | 8 |
| The symbol 18O indicates the ___________ of a form of oxygen | atomic mass or mass number |
| A number placed in front of a formula in order to balance an equation is called a | coefficient |
| Oxygen and hydrogen are examples of __________ molecules | diatomic |
| As the results of chemical changes, substances called _______ are formed | products |
| An equation indicates a statement of | equality |
| Structural formulas show the kinds, numbers, and _______ of atoms in a molecule | arrangement |
| A element is made of the same kind of | atoms |
| The formula 2H2O2 shows that this substance has ________ atoms of oxygen | 4 |
| A empirical formala shows __________ in their simplest proportion | atoms |
| In formulas, the ___________ shows the proportions in which atoms combine | subscript |
| The symbol for the oxygen _____________is O | ion |
| A calcium atom becomes a charged particle if its outer shell loses | electrons |
| _________ bonds are formed by loss and gain of electrons | Ionic |
| A double bond results from the sharing of _______ pair of electrons | 2 |
| The atomic mass of each isotope of an element is | different |
| _____ elements have isotopes | all |
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rentoria
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