8th Grade Science 2nd Six Weeks CAT
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The subscripts in a formula provide information about… | The number of atoms of each element present
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| Name a coefficient in this equation: MgSO4 + 2HCl yields MgCl2 + H2SO4 | Coefficient: 2 before HCl
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| Which equation is balanced? CuO + 2HCl yields CuCl2 + H2O or 6CO2 + 6H2O yields C6H12O6 + 4O2 | CuO + 2HCl yields CuCl2 + H2O with
Cu-1 on each side, H-2 on each side,
Cl -2 per side
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| Which of the equations is unbalanced? CuO + 2HCl yields CuCl2 + H2O or 6CO2 + 6H2O yields C6H12O6 + 4O2 | 6CO2 + 6H2O yields C6H12O6 + 4O2 with
O – 18 on reactant side; 14 on product side
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| Which equation is balanced? 4 Fe + 6 Cl2 yields 4 FeCl3 or HCl + 2NaCO3 yields H2CO3 + 2NaCl | 4 Fe + 6 Cl2 yields 4 FeCl3 with
Fe -4 per side, Cl – 12 per side
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| Which of the equations is unbalanced? 4 Fe + 6 Cl2 yields 4 FeCl3 or HCl + 2NaCO3 yields H2CO3 + 2NaCl | HCl + 2NaCO3 yields H2CO3 + 2NaCl with
H–1 on reactant side and H-2 on product side;
Cl-1 on reactant side and Cl-2 on product side;
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| Name the reactants in the equation: MgSO4 + 2HCl yields MgCl2 + H2SO4 | Reactants: MgSO4 + 2HCl
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| Name the products in the equation: MgSO4 + 2HCl yields MgCl2 + H2SO4 | Products: MgCl2 + H2SO4
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| What information do the subscripts in this chemical formula tell you about this substance? Cu(NO3)2 | There is 1 atom of copper, 2 atoms of nitrogen, and 6 atoms of oxygen: Total atoms: 9 atoms
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| How many atoms of oxygen can be found in the reactants of this equation? 6CO2 + 6H2O yields C6H12O6 + 4O2 | 18
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| Which of the following is true about the law of conservation of mass? | The mass of the reactants must always equal the mass of the products
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| What is the number of hydrogen, sulfur, and oxygen atoms in 5H2SO4? | H:10, S:5, O:20
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| In the Law of Conservation of Mass, what happens to the atoms involved in a chemical reaction? | Reactant atoms are rearranged to form new compounds called the products in a balanced equation.
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| If a chemical equation is balanced.. | Mass is conserved and stays the same on both sides of the equation
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| Indications that a chemical reaction has occurred include: | Production of a gas (bubbling or fizzing); Change in color (like rust on a nail);
Production of heat or cold or light (energy exchange);
Formation of a precipitate (solid forms in a liquid);
Burning a substance (like coal)
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| How do you know if a chemical reaction has taken place? | New substances are formed, like a solid, or precipitate, with different properties
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| New substances formed in a chemical reaction are shown… | On the right side of the equation and are called products
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| Reactants in a chemical reaction are | On the left side of the equation
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| Equation: Sb2S3 + 3Fe yields 3FeS +2 Sb | Reactants: Sb2S3 + 3Fe Products: 3FeS +2 Sb
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| How many atoms are present on the reactant side of: Sb2S3 + 3Fe yields 3FeS +2 Sb | Sb:2 + S:3 + Fe:3 = 8
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| How many atoms are present on the product side of: Sb2S3 + 3Fe yields 3FeS +2 Sb | Fe atoms = coefficient 3 x subscript 1 = 3;
S atoms = coefficient 3 x subscript 1 = 3;
Sb atoms = coefficient 2 x subscript 1 = 2;
Total: 8 atoms
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| A white solid produced in a chemical reaction is called a… | precipitate
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| How many Elements are in the compound Mg(OH)2 | 3 Elements: Magnesium, Oxygen, and Hydrogen
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| How many elements are in the chemical formula O2 | 1 element
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| Number of Atoms in H2CO3 | 2H + 1C + 3O = 6 atoms in all
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| Number of Hydrogen atoms in 4HNO3 | coefficient 4 x subscript 1 = 4 atoms of H
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| Balanced Equations have | number of each atom in reactant = number of each atom in product
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| Balanced equations demonstrate the Law of Conservation of mass because | the number of atoms in the reactants = the number of atoms in the products.
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| Example of Balanced equation: NH4NO2 yields N2 + 2H2O | 2 atoms of N on each side;
4 atoms of H on each side;
2 atoms of O on each side
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| Example of Un-Balanced Equation: 4 atoms of H reacting on left, but… 2 atoms reacting on the left, but... | NH4NO2 yields N2 + H2O:
Only 2 atoms of H produced on right;
Only 1 atom of O produced on right
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| Unbalanced equations violate… | The Law of Conservation of Mass
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| When 2 unequal forces pull in opposite directions, how do you find the Net Force? The direction? | Subtract the unbalanced forces to find the net force. Movement will be to the direction of the greater force.
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| When more than 2 unequal forces are involved, how do you find the Net Force? The direction? | Combine like forces, then subtract the forces. If still unbalanced, movement will be toward the direction of the greater force.
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| In order to move an object, you must exert a force that is | Stronger than the friction force
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| When objects bump, the larger one | exerts greater force on the smaller
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| An object in motion, not subject to any force, will | Continue in motion at a constant speed in a straight line
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| A speeding car that stops suddenly will cause passengers without seat belts to… | Continue to move forward in a straight line, at first
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| If forces are balanced, | Net Force is 0 Newtons
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| In football, a player with more mass (in Kg) and a player with less mass (in Kg) have a head-on collision. Result? | The player with more mass will push the player with less mass backwards because he exerts greater force.
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| Several vehicles are moving along at the same speed. Which one can come to a complete stop First? | The smallest vehicle can stop first because it has less mass.
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| To go forward in water, you push the water | backward
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| When swimming, The action force: | pushing on the water with hands and feet;
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| When swimming, the reaction force: | the water pushing back on hands and feet;
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| When swimming, the reaction force: | moves you forward
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| Opposing forces that push: | two arrows pointing towards each other
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| To find the net force of opposing forces: | Subtract!
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| Forces that move together: | two arrows pointing in the same direction
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| To find the net force of forces that move together: | Add!
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| If you push against a car with a force of 30 N and the car does not move, | The car is pushing back on you with a force that is greater than 30 N
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