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GJHS Phys. Sci S2
GJHS Phys Sci Exam Review Pt. 1 2010-2011
| Question | Answer |
|---|---|
| Chemistry is the study of the properties of matter and the changes matter can undergo. | True |
| Energy is the rate at which work is done. | False |
| During combustion, a fuel's electromagnetic energy is converted to thermal energy. | False |
| An ice cube melts when its mechanical energy increases. | False |
| If you landed on the moon, your weight there would be the same as when you are on Earth. | False |
| A compressed spring has elastic potential energy. | True |
| A piece of solid gold will sink in water because it is less dense than water. | False |
| The elements in each period of the periodic table generally have the same number of valence electrons. | False |
| The kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf. | False |
| When work is done on an object, the object gains energy. | True |
| Adding a solute to a solvent will raise the freezing point of the solvent. | False |
| In general, the physical properties of nonmetals are similar to the properties of metals. | False |
| Fusion is the process in which existing nuclei combine and make new nuclei. | True |
| When an atom gains an electron it becomes a positive ion. | False |
| A gas necessary for combustion to take place is carbon dioxide. | False |
| The attraction between a positive ion and a negative ion results in a covalent bond. | False |
| A polyatomic ion is an ion made of more than one atom. | True |
| A change that produces a new substance is a chemical change. | True |
| Chemical reactions that absorb energy are said to be exothermic. | False |
| A change that produces a new substance is a chemical change. | True |
| The amount of matter in a chemical reaction changes. | False |
| One example of a physical change is: A. Baking cookies B. Mixing a milkshake | B. Mixing a milkshake |
| These are examples of properties except: A. Hardness B. Color C. Symbols | C. Symbols |
| Each specific substance can be identified by its properties. | True |
| These are substances that can not be broken down chemicaly into other substances. | Elements |
| The measurement of the force of gravity on an object is the object's _______. | Weight |
| The pH scale measures _________________. | Concentration of hydrogen ions |
| A rolling bowling ball is an example of this kind of energy? | Kinetic energy |
| The ability to do work is called ____________. | Energy |
| If a solution has a pH of 9, the solution is ____________________. | Basic |
| Normal rainfall is slightly acidic, which means its pH must be between 5 and 7, True or False? | True |
| How does pH affect enzymes during digestion? | Different enzymes work best at different pH values. |
| Neutralization is a reaction between an acid and this? | Base |
| The process that breaks down complex molecules of food into smaller particles is called this? | Digestion |
| Potential energy that depends on height is called this? | Gravitational potential energy |
| The total energy of the particles in an object is called this? | Thermal energy |
| This energy is stored in the core of an atom. | Nucler energy |
| An example of something that stores chemical energy is: A. Lightning or B. A Match | B. A match |
| Visible light is an example of this type of energy. | Electromagnetic energy |
| A device that is twice as powerful as another can do the same amount of work in what amount of time? | Half |
| The scientist who suggested that energy can be created under certain conditions. | Einstein |
| Niagara Falls is a good example of potential energy being converted into this type of energy? | Kinetic |
| What type of conversion is taking place when natural gas is used to heat water? | Chemical energy into thermal energy |
| Power is measured in units called ___________. | Watts |
| One horsepower is equal to how many watts? | 746 watts |
| The common state of matter that does not have a definite shape or a definite volume is this? | A gas |
| When the temperature of a gas in a rigid container increases, the pressure will _______________. | Increase |
| The pressure of a gas is equal to the force of its outward push divided by the ___________ of the walls of the container. | Area |
| A gas in a rigid container allows you to study changes in the temperature & ___________________ of a gas. | Pressure |
| In the 1800s, Dmitri Mendeleev organized the known elements into this. | Periodic Table |
| Nitrate (NO3-)& Ammonium (NH4+)are examples of these? | Polyatomic ions |
| When ions having a charge of 2+ form bonds with ions having a charge of 2-, the charge on the resulting compound is _____________. | Zero |
| When an ionic compound forms, the total number of positive charges and the total number of negative charges must be _________. | Equal |
| Molecular solids have _______ melting and boiling points compared to ionic compounds. | Low |
| Color, shininess, and hardness are examples used to identify these. | Mineral crystals |
| The reaction between magnesium carbonate and hydrochloric acid to form magnesium chloride and carbonic acid may be classfied as this type of reaction? | Replacement reaction |
| Rust forms when iron metal combines with oxygen in the air to produce iron oxide. This reaction is an example of what type of reaction? | Synthesis reaction |
| The balanced chemical equation P4O10 +6H20-->4 H3PO4 tells you that __________ molecules of H3PO4are formed in the reaction. | Four |
| Because the presence of a solute makes it harder for solvent molecules to evaporate, the boiling point of a solution is _________ than that of the pure solvent. | Higher |
| A truck and car are moving at the same speed. The truck has greater kinetic energy because its _________________ is greater. | Mass |
| If the velocity of an object is doubled, its kinetic energy is multiplied by ________. | Four |
| To maintain your body temperature, your body converts chemical potential energy into this. | Thermal Energy |
| An electric motor converts electrical energy into ____________________ energy. | Mechanical |
| In power plants, generators convert mechanical energy into this type of energy. | Electrical |
Created by:
Ms. Traynor-Grimes (Ms.TG)
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