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2nd 6w CAT
8th Grade Science 2nd Six Weeks CAT
| Question | Answer |
|---|---|
| The subscripts in a formula provide information about… | The number of atoms of each element present |
| Name a coefficient in this equation: MgSO4 + 2HCl yields MgCl2 + H2SO4 | Coefficient: 2 before HCl |
| 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 |
| 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 |
| 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 |
| 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; |
| Name the reactants in the equation: MgSO4 + 2HCl yields MgCl2 + H2SO4 | Reactants: MgSO4 + 2HCl |
| Name the products in the equation: MgSO4 + 2HCl yields MgCl2 + H2SO4 | Products: MgCl2 + H2SO4 |
| 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 |
| How many atoms of oxygen can be found in the reactants of this equation? 6CO2 + 6H2O yields C6H12O6 + 4O2 | 18 |
| 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 |
| What is the number of hydrogen, sulfur, and oxygen atoms in 5H2SO4? | H:10, S:5, O:20 |
| 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. |
| If a chemical equation is balanced.. | Mass is conserved and stays the same on both sides of the equation |
| 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) |
| How do you know if a chemical reaction has taken place? | New substances are formed, like a solid, or precipitate, with different properties |
| New substances formed in a chemical reaction are shown… | On the right side of the equation and are called products |
| Reactants in a chemical reaction are | On the left side of the equation |
| Equation: Sb2S3 + 3Fe yields 3FeS +2 Sb | Reactants: Sb2S3 + 3Fe Products: 3FeS +2 Sb |
| How many atoms are present on the reactant side of: Sb2S3 + 3Fe yields 3FeS +2 Sb | Sb:2 + S:3 + Fe:3 = 8 |
| 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 |
| A white solid produced in a chemical reaction is called a… | precipitate |
| How many Elements are in the compound Mg(OH)2 | 3 Elements: Magnesium, Oxygen, and Hydrogen |
| How many elements are in the chemical formula O2 | 1 element |
| Number of Atoms in H2CO3 | 2H + 1C + 3O = 6 atoms in all |
| Number of Hydrogen atoms in 4HNO3 | coefficient 4 x subscript 1 = 4 atoms of H |
| Balanced Equations have | number of each atom in reactant = number of each atom in product |
| Balanced equations demonstrate the Law of Conservation of mass because | the number of atoms in the reactants = the number of atoms in the products. |
| 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 |
| 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 |
| Unbalanced equations violate… | The Law of Conservation of Mass |
| 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. |
| 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. |
| In order to move an object, you must exert a force that is | Stronger than the friction force |
| When objects bump, the larger one | exerts greater force on the smaller |
| An object in motion, not subject to any force, will | Continue in motion at a constant speed in a straight line |
| A speeding car that stops suddenly will cause passengers without seat belts to… | Continue to move forward in a straight line, at first |
| If forces are balanced, | Net Force is 0 Newtons |
| 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. |
| 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. |
| To go forward in water, you push the water | backward |
| When swimming, The action force: | pushing on the water with hands and feet; |
| When swimming, the reaction force: | the water pushing back on hands and feet; |
| When swimming, the reaction force: | moves you forward |
| Opposing forces that push: | two arrows pointing towards each other |
| To find the net force of opposing forces: | Subtract! |
| Forces that move together: | two arrows pointing in the same direction |
| To find the net force of forces that move together: | Add! |
| 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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m9000038
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