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Science Midterm Rev
9th Grade Science Midterm Review
| Question | Answer |
|---|---|
| What is not a branch of biology? | Geology |
| Pure Science is best defined as the? | continuing search for new knowledge. |
| A scientific theory is an explanation that? | has been tested by many obervers. |
| For a scientific theory to be valid, it must allow you to? | make predictions. |
| Scientific theories can be changed or replaced when? | new discoveries are made. |
| A series of logical steps that it followed in order to solve a problem is called? | scientific method |
| The first step in the scientific method is usually? | making observations. |
| Scientist test a hypothesis by? | doing experiments |
| Experiments can only help to answer reed a factual events. A experiment can not tell us? | what is not known. |
| The SI unit for measuring temperature is the? | kelvin |
| Which SI prefix means one one-hundredth (1/100)? | centi |
| The force with which gravity pulls a quanity of matter is reffered to as? | weight |
| The decimal equivalent of 10(-2) is? | 0.01 |
| A precise measurement is one that? | is as exact as possible |
| The science of what matteris made of and how it changes is called? | chemistry |
| The chemical element that is most abundant in the human body is? | oxygen |
| The smallest unit of a substance that behaves like a substance is? | a molecule |
| You put 1 gram of sat into 1 liter of water and stir. The resulting liquid is an example of? | a homogeneous mixture. |
| A carbonated drink is an example of? | a gas-liquid mixture. |
| Knowing the chemical properties of a substance will tell you how the substances reacts with? | other substances |
| Which state of matter will hold its shape with out a container? | solid |
| A physical property of gold is its? | density |
| Calculate the denstiy of mass 360 grams volume of 7.83 cm(3)? | 360g/7.5cm(3)=48g/cm(3) |
| Evaporation of water is not a potential sign of? | chemical change |
| What determines the speed of the atoms and molecules of a particular substance? | the size and temperature |
| Archimedes principle states that the buoyant force on a ____ is equal to the weight desplaced? | object in fluid. |
| When ice melts to form water, energy? | is absorbed. |
| The kinetic theory states that the higher the temperature the faster the? | particles that make up a substance moves. |
| Evaporation refers to the change of state from a? | liquid to a gas. |
| The law of consevation of mass states that mass cannot be? | created nor destroyed. |
| Ice floats in water because it is? | less dense than water. |
| Charles law relates the volume of gas to its? | temperature. |
| Pressure is calculated by dividing force by the ____over which force is exerted? | area |
| Dalton's atomic theory stated that every element was made of atoms that could not be subdivided atoms of the same element are alike and? | Atoms can join to form molecules. |
| Dalton's atomic theory was accepted because? | there was evidence to support it. |
| Atoms at the same element are exactly alike is? | a false statement according to Dalton's theory |
| Atoms have no electic charge because they? | have equal of protons and electrons. |
| According to the Bohr's model of an atom, electrons behave like? | planets orbiting the sun/ |
| According to modern atomic theory, it is nearly impossible to determine an electron's exact? | position. |
| Ionization refers to the process of? | loosing or gaining electrons. |
| An atomic mass unit is equal to? | One-twelth the mass of a carbon 12 atom |
| Sodium is? | an alkali metal |
| Alkali metals are extrenlet reative because they? | have on valence electron that is easily removed. |
| Noble gases exist as single atoms rather than? | molecules |
| Carbon and othe nonmetals are found in which are of the periodic table? | on the right side. |
| Transition metals such as copper of tungster form compounds by? | loosing electrons to form positive ions. |
| A mole is an SI base unit that describes the? | Amount of a substance. |
| Molar mass is defined as? | The mass in grams of 1 mole of a substance |
| A compound differs from a mixture because it? | always contains the same elements in the same proportion. |
| Salt (NaCl) is formed from a tight network of? | oppositley charged ions. |
| Often atoms join so that each atom will have? | an outermost energy level that is full of electons. |
| Gases often take up a lot of space because? | their molecules have very little attraction for one another. |
| The bonds that hold atoms together behave most like? | flexible springs. |
| In a metallic Bond, the nucleaus of one atom is attracted by a nearby atons? | electrons |
| copper is a good conductor of electricity because its electrons? | are free to move from atom to atom. |
| in hich tupe of bond do atoms share electrons? | covalent bonds. |
| DInitrogen TETROxide tells you the compound contains? | 2 nitrogen and 4 oxygen |
| Fe2O3 is iron (III) oxide it contains | Fe3+ ions |
| It is possible for different covalent compounds to have the same empirical formula because empirical formulas represtent? | a ratio of atoms in a compound. |
| A substance that undergoes a change in a chemical reaction is? | reactanct |
| What happens in a chemical reaction? | Atoms are rearranged |
| In a exothermic reaction, energy is transferred from? | The reactants to the surroundings |
| Endotherminc reactions transfer from surroundings to the reactants | |
| Chemical energy is energy that is? | present within atoms and molecules |
| A synthesis reaction is a reaction between at least 2 compounds in which? | a new, more complex compound formed. |
| Digestion is an example of | a decomposition reaction |
| When methane reacts with oxygen the products are | Carbon dioxide and water. |
| When water is broken down by electrolysis, the products are | 1+ and O2 |
| Fragments of molecules that have at least one electron for bending is called? | radicals |
| In a balanved chemical reaction, the told mass of the products always equals? | mass of reactants. |
| Reduciong temperature makes dough | rise slower |
| Rubbing Alchohol is | a homogeneus mixture. |
| Suspensions can usually be seperated by paper filters | - |
| Solubility refers to? | grams of solute per 100 grams of solvent |
| Loose suger dissolves much faster than a sugar cube because? | a greater surface area. |
| Water can dissolve charged particles because | its atoms have partial charges. |
| Sugar will dissolve more quickly in iced tea if you stir it because stirring | allows molecules to diffuse |
| Water is reggered to as the universal solvent because | many substances dissolve in water |
| An unsaturated solution is one that can dissolve more solute at cument conditions. | - |
| Solute will precipitate out of a supersaturated solution when it cools down. | - |
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