A) The change can be seen but in a physical change it cannot B) A new substance is formed and in a physical change no new substance is formed C) Chemicals are used D) Molecules do not physically touch
A) The atoms of the reactants always stay together to form the products B) New atoms are formed which combine to make the products C) Some atoms disappear while others multiply to form the products D) The atoms of the reactants unbond, rearrange, and then rebond to form the products
A) 1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms B) 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms C) 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms D) 4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms
A) The mass of the products stays the same during a chemical reaction B) The mass of the reactants stays the same during a chemical reaction C) The mass of the products is always twice the mass of the reactants. D) The type and number of atoms in the reactants equals the type and number of atoms in the products
A) More reactants have more atoms to react to form more products B) More reactants cause the reaction to heat up C) More reactants take up the same volume D) Too many products can slow down the reaction
A) One that needs a catalyst B) Endothermic C) Not one that produces anything new D) Exothermic
A) More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants B) The same amount of energy is used to break the bonds of the reactants as is released when the bonds in the products are formed C) It takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed D) The temperature goes down
A) Neurons between molecules B) Neutrons between atoms C) Neutrons between atoms D) Electrons between atoms
A) reduced B) neutral C) charged D) oxidized
A) gain; loss B) loss; gain |