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ValentinkaMS [17]
3 years ago
10

An experiment is designed to determine the launch angle that will give a projectile the greatest range (make it go the longest d

istance). The "launcher" is a slingshot type apparatus that is spring-loaded and released by a trigger. For each trial, the same painted rock is retrieved and launched. Measurements are taken linearly from the launch site to the landing site. The trials were done on a windless day.
Which of the following is the dependent variable?
A-the angle of the launcher
B-the amount of wind
C-how the distance was measured
D-how far the rock went
Chemistry
1 answer:
konstantin123 [22]3 years ago
7 0
<span>The dependent variable is the variable which is the result of the changing experimental variable. In this case, how far the rock went is a result of changing the angle of launch. Therefore, how far the rock went is the dependent variable.</span>
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Answer:

Theoretical Yield

Percent yield

Example stoichiometry problem

How much oxygen can be prepared from 12.25 g KClO3 . (Use molar mass KClO3 = 122.5 g.)

Most stoichiometry problems can be solved using the following steps.

Step 1.

Write and balance the equation for the decomposition of KClO3 with heat (∆). 2KClO3 + ∆ → 2KCl + 3O2

Step 2.

Convert what you have (in this case g KClO3) to moles.

# moles = grams/molar mass = 12.25 g /122.5 = 0.100 mole KClO3.

Step 3.

Using the coefficients in the balanced equation, convert moles of what you have (moles KClO3) to moles of what you want (in this case moles oxygen).

0.100 mol KClO3 x (3 moles O2/2 moles KClO3) = 0.100 x (3/2) = 0.150 mole O2.

Step 4.

Convert moles from step 3 to grams.

moles x molar mass = grams

0.150 mole O2 x (32.0 g O2/mole O2) = 4.80 g O2 produced from 12.25 g KClO3. This is the theoretical yield. If the ACTUAL yield is 4.20 grams, calculate percent yield. Percent yield = (actual yield/theoretical yield) x 100 = (4.20/4.80) x 100 = 87.5% yield

NOTE: In step 1, moles can be obtained other ways; in step 4 moles can be converted to other units.

a. For solutions, M x L = moles (or mL x M = millimoles).

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Energy of n = 2 in an hydrogen atom:

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Answer:

Hey mate....

Explanation:

This is ur answer.....

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