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