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| 3014028629 | Matter | Anything that takes up space and has mass | 0 | |
| 3014031035 | Elements | A substance that cannot be broken down to other substances by chemical reactions | 1 | |
| 3014041987 | Compounds | A substance consisting of two or more different elements combined in a fixed ratio | 2 | |
| 3014033399 | Life's essential elements: | Carbon, oxygen, hydrogen, and nitrogen Phosphorus, sulfur, calcium, and potassium are required in smaller amounts | 3 | |
| 3014039678 | Trace elements | Required by organisms in only small amounts | 4 | |
| 3014338845 | atoms | The smallest unit of matter that still retains the properties of an element | 5 | |
| 3014057864 | Protons and neutrons form the... | The atomic nucleus | 6 | |
| 3014060034 | Daltons measure... | The mass of atoms and subatomic particles | 7 | |
| 3014049726 | The atomic number is based on... | Protons. (All atoms of a particular element have the same number of protons) | 8 | |
| 3014047066 | The mass number is based on... | The sum of protons plus neutrons | 9 | |
| 3014044048 | Atomic mass is based on... | Total mass. Mainly the weight of protons and neutrons | 10 | |
| 3014061521 | Isotopes | Two atoms of an element that differ in number of nuetrons | 11 | |
| 3014065164 | Radioactive isotopes | The nucleus decay spontaneously giving off particles and energy - when the decay of leads to a change in the number of protons it becomes a different | 12 | |
| 3014073842 | Biologists use radioactive isotopes to... | - date fossils - as tracers through metabolic processes -diagnosing medical disorders | 13 | |
| 3014083222 | Energy | The capacity cause change | 14 | |
| 3014085085 | Potential energy | The energy matter possesses because of its location or structure | 15 | |
| 3014091042 | Matter has a natural tendency to move to the lowest state of potential energy | ... | 16 | |
| 3014111992 | Electrons in the first shell have the _______ potential energy | Lowest (increases shell by shell) | 17 | |
| 3014127126 | The chemical behavior of an atom depends on... | The number of electrons in the outermost shell | 18 | |
| 3014122409 | An atom with a completed valence shell is... | Unreactive (inert) | 19 | |
| 3014088391 | The more distant the electrons are from the nucleus the ______ the potential energy | Greater | 20 | |
| 3014381624 | Chemical bonds | atoms with incomplete valence shells can share or transfer valence electrons | 21 | |
| 3013914609 | Covalent bond | The sharing of a pair of valence electrons | 22 | |
| 3013903092 | Electronegativity | an atom's attraction for the electrons in a covalent bond | 23 | |
| 3013898608 | Nonpolar covalent bond | Equal sharing of electrons | 24 | |
| 3013893033 | Polar covalent bond | (unequal sharing) | 25 | |
| 3013888069 | Ionic bonds | When an atoms transfer electrons (severely unequal) | 26 | |
| 3013918184 | Ion | A charged atom | 27 | |
| 3013922036 | A cation is a ... | Positive ion | 28 | |
| 3013918185 | An anion is a ... | Negative ion | 29 | |
| 3013938673 | Salts are... | Ionic compounds | 30 | |
| 3014131955 | Hydrogen bonds occur when... | A hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom | 31 | |
| 3014137351 | Weakest bonds are... | Ionic bonds or hydrogen bonds | 32 | |
| 3014139189 | Strongest bonds are... | Covalent bonds | 33 | |
| 3014145123 | Van der Walls interations | are interactions between molecules that are close together as a result of asymmetrical electrons | 34 | |
| 3014095521 | An electron can change shells by absorbing or losing energy. when they absorb energy, they move to a farther shell. When they lose energy, they "fall back" to a closer shell. The loss of energy is released as... | Heat | 35 | |
| 3015181458 | Molecules with similar shapes can have similar biological effects because... | biological molecules recognize and interact based on molecular shape | 36 | |
| 3015186354 | Chemical reactions are... | the making and breaking of chemical bonds | 37 | |
| 3015195241 | Chemical equilibrium | when the forward and reverse reaction rates are equal | 38 |
