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3 years ago

What do the percentiles on the PSAT score report mean?

SAT

2 answers:

WARRIOR [948]3 years ago

5 0

Answer:

C. How students compare with other PSAT test-takers

Explanation:

Basically, your percentile score is a number that tells you what percentage of other students you scored higher than. Your percentile rank represents the percentage of students whose score is equal to or lower than your score. For example, if your score is in the 75th percentile, 75% of a comparison group achieved scores at or below that your score.

AnnyKZ [126]3 years ago

5 0

Answer:

your answer is D.

Explanation:

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3 years ago

His worrying nature and his ______________ were the results of a constant fear of death.

umka21 [38]

I think the answer is D

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3 years ago

Write a scientific explanation describing if the night sky looks the same all year.

Leya [2.2K]

Answer:

The night sky is different at different times of the year. You see different constellations every now and then. This change is due to the motion of the Earth in its orbit around the Sun. Each day a few stars are visible in the east that were not visible the night before.

Explanation:

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3 years ago

Which of these hormones causes elevation of the level of glucose in human blood?

Basile [38]

Epinephrine is the hormone that causes elevation of the level of glucose in human body.

Given that the hormones are causing elevation of the level of glucose in human blood.

We are required to tell the name of the hormone that causes elevation of the level of glucose in human blood.

Hormones are basically our body's chemical messengers. Their work is to travel in our bloodstream to tissues or organs. They have to work slowly, over time, and affect many different processes, including: Growth and development. The name of the hormone that causes elevation of the level of glucose in human body is ephinephrine.

Hence epinephrine is the hormone that causes elevation of the level of glucose in human body.

Learn more about hormones at brainly.com/question/8162998

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2 years ago

Kp for the following reaction at a give temperature is 0. 263 at 1000. K: c(s) + 2 h2(g) ⇌ ch4(g) what is the total pressure (in

ratelena [41]

This problem is providing us with the reaction whereby methane is produced from solid carbon and gaseous hydrogen, as well as its Kp and asks for the total pressure at equilibrium for a specified addition of reactants. At the end, the answer turns out to be 11.7 atm.

<h3>Chemical equilibrium</h3>

In chemistry, when a chemical reaction takes place, it proceeds until a point called equilibrium, where the concentration of all the species start becoming unchanged. Thus, we can use equilibrium expressions whenever we needed pressures or concentrations at equilibrium.

In this case, for the reaction we were given, we can write the following equilibrium expression, where the solid carbon is excluded:

$Kp=\frac{p_{CH_4}}{p_{H_2}^2} =0.263$

Which can also be written in terms of the reaction extent and the initial pressure of hydrogen:

$0.263=\frac{x}{(p_{H_2}^0-2x)^2}$

Thus, we calculate the initial pressure of hydrogen with the temperature and volume of the flask:

$p_{H_2}^0=\frac{(4.50g/2.02g/mol)*0.08206\frac{atm*L}{mol*K}*1000K}{10.0L}\\ \\p_{H_2}^0=18.3atm$

Hence, we solve for x in the equilibrium expression as follows:

$0.263=\frac{x}{(18.3-2x)^2}\\\\x_1=6.64atm\\\\x_2=12.6atm$

Where the correct value is 6.64 atm because the 12.6 atm turns out into a negative pressure for hydrogen at equilibrium. Finally, we calculate the total pressure with:

$P_T=p_{CH_4}+p_{H_2}=x+18.3-2x\\\\P_T=6.64atm+18.3atm-2*6.64atm\\\\P_T=11.7atm$

Learn more about chemical equilibrium: brainly.com/question/13444482

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3 years ago