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Which of the following is true for all chemical reactions?
1. The total mass of the reactants increases.
2. The total mass of the products is greater than the total mass of the reactants
3. The total mass of the reactants equals the total mass of the products.
4. The total mass of the products is less than the total mass of the reactants.
The sum of the fixed costs and the variable costs.
1. taxes
2. total costs
3. depreciation
4. total product
Grade 11 Atomic Structure
An atom's mass number mathematically equals
1. the total number of protons plus neutrons.
2. the total number of protons.
3. the total number of neutrons.
4. the total number of protons plus electrons.
Grade 7 World War II
What is the principle of conservation of mass?
1. The total mass must change for a chemical reaction to occur.
2. The total mass of the reactants must be greater than the total mass of the products.
3. The total mass of the products must be greater than the total mass of the reactants.
4. The total mass of the reactants must equal the total mass of the products.
College Forces and Motion
The sum of all the external forces on a system of particles is zero. Which of the
following must be true of the system?
1. The total mechanical energy is constant.
2. The total potential energy is constant.
3. The total kinetic energy is constant.
4. The total linear momentum is constant.
5. It is in static equilibrium.
Grade 6 Forces and Motion
Average speed is found by
1. dividing total distance traveled by the total time.
2. multiplying the displacement by the time spent.
3. multiplying total distance traveled by the total time.
4. dividing the displacement by the time spent.
Grade 6 Energy and Momentum
Mechanical energy is the
1. total of all the potential energy in an object.
2. total of all the kinetic energy in an object.
3. total of an object's potential and kinetic energy.
4. total of an object's stored and kinetic energy.
Grade 9 Communities, Populations, and Ecosystems
What is biomass?
1. total amount of living tissue without water
2. total amount of living tissue with water
3. total amount of water in living tissue
4. total amount of life on earth
In all chemical equations, the products' collective mass                                                              .
1. is less than the reactants' total mass
2. is greater than the reactants' total mass
3. is equal to the reactants' total mass
4. has no quantitative relationship to the reactants' total mass
In chemical reactions, what does the principle of conservation of mass mean?
1. Matter is not changed.
2. The total of mass of the reactants is greater than the total mass of the products.
3. Matter is not created or destroyed.
4. The total mass of the reactants is less than the total mass of the products.
Grade 12 Light and Optics
What occurs when the angle of incidence of a light ray is greater than the critical angle?
1. critical refraction
2. total internal reflection
3. total external reflection
4. dispersion
Grade 11 Respiration, Digestion, and Excretion
Grade 9 Oceanography and Hydrology
The definition of salinity is
1. the total amount of dissolved salt in water.
2. the total amount of soil in the ocean.
3. the difference between temperature and density.
4. the total amount of minerals in seawater.
College Quantum Physics and the Atom
Which of the following defines an orbital?
1. The surface containing 80% of the total electron probability
2. The surface containing 76% of the total electron probability
3. The surface containing 90% of the total electron probability
4. The surface containing 50% of the total electron probability
Grade 12 Personal Finance
The total you get after you have reconciled your account should match the total that is
1. In my check register
2. on the bank statement
3. the total of the outstanding deposits
4. the total of the outstanding checks