Valence Electrons has 
chlorine
The energy available to primary consumers in an energy pyramid is 800 kilocalories. Approximately how much energy is used by the
2 answers:
Answer:
B. 720 kilocalories
Explanation:
The primary consumers use about 90% of available energy pyramid for their physical functions. In order to solve this exercise, we need to calculate the 90% of 800 kilocalories.
We can state that there is a direct linear relationship between the kilocalories and the percentage. This means that for a higher percentage the amount of kilocalories will be greater.
We can write :
Where the denominators are percentages.
Solving for x :
The correct option is B. 720 kilocalories
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Answer:
Explanation:
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In this case, since we know the balanced chemical reaction, we are first able to realize there is a 1:3 mole ratio between zinc phosphate and zinc chloride; it means that we can first compute the moles of the desired product via stoichiometry:
Next, since those moles are associated with the theoretical yield of zinc chloride, we obtain the corresponding mass:
Finally, we compute the percent yield by diving the actual yield (18 g) by the theoretical yield:
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As the temperature increases, B) the molecules started moving faster.
Explanation:
The temperature of a substance is a measure of the average kinetic energy of the particles in a substance. In particular, it can be found that the temperature is directly proportional to the average kinetic energy of the particles:
The kinetic energy of a particle is given by
where
m is the mass of the particle
v is its speed
This means that the higher the temperature of a substance, the greater the speed of the particles in the substance.
Therefore, if we apply this concept to this problem, we infer that as the temperature of the water in the pond gets higher, the speed of the molecules inside the water increases, which means that the molecules are moving faster.
Therefore, the correct answer is
B) the molecules started moving faster.
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