Chemical Reactions Part 2 Question Preview (ID: 35974)
Chemical Reactions The Second Part.
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Which statement correctly describes how the following chemical equation violates the law of conservation of mass? H2 + O2 → 2HO2
a) There are the same number of hydrogen atoms on the left side of the arrow as there are on the right side.
b) There are more hydrogen atoms on the right side of the arrow then on the left side.
c) There are more hydrogen atoms on the left side of the arrow then on the right side.
d) There are more oxygen atoms on the right side of the arrow then on the left side.
When a chemical reaction takes place, the reaction must end with the same _____________ it began with.
a) type of molecules
b) state of matter
c) number of gases
d) physical changes
In chemical reactions, the number of atoms in the product is __________.
a) the same as the number of molecules in the reactants
b) greater than the number of atoms in the reactants
c) less than the number of atoms in the reactants
d) the same as the number of atoms in the reactants
The mass of the reactants in a chemical reaction is 4.00 kg. After the reaction takes place completely, there will be __________.
a) 2.00 kg of reactants
b) 4.00 kg of products
c) 2.00 kg of products
d) 4.00 kg of reactants
n a chemical reaction you begin with 18 atoms. When the reaction is over you would expect to have __________ atoms remaining.
a) there is not enough information
b) more than 18
c) 18
d) less than 18
Which of the following statements is true regarding the Law of Conservation of Mass?
a) It reinforces the idea that atoms are the fundamental building block of matter.
b) It accounts for the fact that in a chemical equation the mass of the products has to be equal to the mass of the reactants.
c) It is fundamental to the idea of balancing chemical reactions
d) All of these are true.
When liquid H2O is chemically separated in a scientific investigation it forms H2 gas and O2 gas. If the number of hydrogen and oxygen molecules does not change through the equation, then the mass will
a) increase from products to reactants.
b) decrease from reactants to products.
c) increase from reactants to products.
d) stay the same from reactants to products.
Meals, Ready to Eat are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.
a) exothermic reaction
b) energy conserving reaction
c) evaporation reaction
d) endothermic reaction
Meals, Ready to Eat are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.
a) the temperature decreased
b) this is an example of an exothermic reaction
c) this is an example of an endothermic reaction
d) energy was absorbed during this reaction
If you wanted to design a product that cooked food without electricity, you might consider using chemicals that when mixed:
a) reacted exothermically
b) reacted endothemically
c) absorbed energy
d) just have a physical change
Mixing hydrochloric acid and sodium hydroxide is an example of an exothermic reaction. If you were holding a beaker while this chemical reaction took place, then you would expect it to feel _______ after the reaction was complete.
a) warmer
b) no change in temperature
c) none of these are correct
d) colder
When substances are mixed, changes in heat energy provide evidence to show if a chemical reaction or a physical change has occurred. In chemical reactions, heat energy is often
a) created and destroyed
b) released or absorbed
c) created only
d) destroyed
Photosynthesis is a chemical reaction where energy is absorbed. A reaction where energy is absorbed is known as an __________.
a) acid-base reaction
b) entropic reaction
c) exothermic reaction
d) endothermic reaction
Mixing baking soda and vinegar is an example of an endothermic reaction. If you were holding a beaker while this chemical reaction took place, then you would expect it to feel _______ after the reaction was complete.
a) none of these
b) warmer
c) no change in temperature
d) colder
Cellular respiration is an example of a chemical reaction where energy is released. Which of the following is a reaction where energy is released?
a) acid-base reaction
b) dissolution reaction
c) exothermic reaction
d) endothermic reaction
Mixing baking soda and vinegar is an example of an endothermic reaction. This means:
a) baking soda and vinegar are products in this reaction
b) there is no change in energy in the chemical reaction
c) energy is released in the chemical reaction
d) energy is taken in during the chemical reaction
An iceberg melting in an ocean is an example of an endothermic process because:
a) A chemical reaction occurs between the iceberg and the ocean.
b) The iceberg releases thermal energy from the surrounding water.
c) The iceberg absorbs thermal energy from the surrounding water.
d) It affects nearby wildlife.
Changes in the total amount of thermal energy provide evidence that chemical reactions have taken place. A chemical reaction in which energy has been absorbed is known as a(n):
a) reversible reaction
b) physical reaction
c) exothermic reaction
d) endothermic reaction
Mixing hydrochloric acid and sodium hydroxide is an example of an exothermic reaction. This means:
a) hydrochloric acid and sodium hydroxide are the products of the reaction.
b) There is no change in energy during the chemical reaction.
c) Energy is released during the chemical reaction.
d) Energy is taken in during the chemical reaction.
Changes in thermal energy provide evidence that a chemical reaction has occurred. Which of the following BEST describes a chemical reaction in which energy is released?
a) exothermic reaction
b) physical reaction
c) reversible reaction
d) endothermic reaction
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