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| A liquid mixture in which particles can be seen and easily separated by settling or filtration is a |
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| A substance that tastes bitter, feels slippery, and turns red litmus paper blue is |
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| acids are described as corrosive because they |
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| eat away at other materials |
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| Any substance that forms hydrogen ions (h+) in water is |
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| Compared to the pH of saliva the pH of stomach juices is |
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| Is a solute or a solvent present in a smaller amount? |
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| Neutralization is a reaction between |
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| Normal rainfall is slightly acidic with a pH of what? |
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| The process that breaks down complex molecules of food into smaller particles is called |
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| What is one way to increase the solubility of sugar in water? |
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| What does a solute do to the freezing point of a substance? |
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Term
| when you add so much solute that no more dissolves, you have a |
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| what do acids do to litmus paper? |
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| what is a likely use for a base? |
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| making soaps and detergents |
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| T OR F- a solute is a mixture in which particles can be seen and easily separated |
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Definition
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| T OR F- among the factors that affect the solubility of a substance are type of solvent and time |
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| T OR F- bases form hydrogen ions (H+) when dissolved in water |
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| How are the noble gases different from other groups of elements? |
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| their atoms do not react easily with other atoms |
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| A naturally occuring solid with a crystal structure and a definite chemical composition is a |
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| an ionic bond is the attraction between |
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| each family in the periodic table has its own characteristic properties based on the number of |
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| in what form can an ionic compound conduct electricity? |
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| ionic compounds are electrically |
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| ions that are made of more than one atom are examples of ________ ions |
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| molecules that contain two polar bonds are _______ _______ |
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| the atomic number is the number of |
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| protons in the nucleus of an atom |
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| very energetic particles that move rapidly in all directions in the space outside the nucleus of an atom are |
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| two pairs of electrons shared between two atoms |
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| what is the chemical name for the compound with the formula Na2S? |
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| what is the greatest number of valence electrons an atom can have? |
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| when an atom loses an electron, it becomes a |
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| which of the following is a characteristic property of ionic compounds? |
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| they form crystals with characteristic shapes |
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which of these particles has a positive charge?
a:atom
b:proton
c:electron |
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Definition
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| T OR F- the nucleus of an atom is the region where the protons and neutrons can be found |
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| T OR F- a nonpolar bond is formed when two atoms share electrons unequally |
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| T OR F- the valence electrons are those electrons found closest to the nucleus |
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| T OR F- when electrons are transferred between two atoms, a covalent bond is formed |
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| smallest part of an element |
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| A chemical reaction that absorbs energy in the form of heat is described as _____ |
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| A solid that forms from solution during a chemical reaction is called _____ . |
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| Chemicals that act as biological catalysts by speeding up reactions in living things are _____ |
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| Each element is represented by a one-letter or two-letter _____ . |
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| Every chemical reaction involves a change in _____ . |
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| In an equation, numbers often appear in front of a chemical formula. These numbers tell you the _____ . |
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Definition
| number of atoms or molecules of each of the substances in the reaction |
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| In chemical reactions, what does the principle of conservation of mass mean? |
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Definition
| matter is not created or destroyed |
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| The force that holds atoms together is called _________________________ . |
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| The minimum amount of energy that has to be added to start a reaction is the __________ __________ . |
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| The simplest type of substance that cannot be broken down into any other substance is a/an ____________. |
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| The substances listed on the left side of a chemical equation are the _____ . |
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| Water vapor in the air turns to liquid water in the form of rain. This is an example of a _________ __________. |
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| What happens when chemical bonds break and new bonds form? |
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Which of the following is a balanced chemical equation?
Choose one answer.
a. H2O2 ---> H2O + O2
b. 2 Fe2O3 + 3 C ---> 4 Fe + 3 CO2
c. SO2 + O2 + 2 H2O ---> 4
d. H2SO4 |
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Definition
| b. 2 Fe2O3 + 3 C ---> 4 Fe + 3 CO2 |
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| True or False: A mixture is a substance made of two or more elements chemically combined in a specific ratio. |
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| True or False: A change that produces a new substance is a chemical change. |
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| True or False: In a chemical reaction, chemical bonds are formed or broken. |
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Definition
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| true or False: The amount of matter in a chemical reaction changes |
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| True or False: The materials present at the beginning of a chemical reaction are called the products. |
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