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Mamont248 [21]
2 years ago
15

A biology class wants to perform an experiment to investigate the effect of different colors of light of green, yellow, red and

clear cellophane and plant three seeds in each one. What part do the three seeds experiment?
a. Confounding variables
b.independent variables
c. Control variables
d. Dependent variables
Chemistry
1 answer:
olga2289 [7]2 years ago
5 0

Answer:

controlled variables

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What volume is occupied by 0.109 molmol of helium gas at a pressure of 0.98 atmatm and a temperature of 307 K
KATRIN_1 [288]

Answer:

2.8 L

Explanation:

From the question given above, the following data were obtained:

Number of mole (n) = 0.109 mole

Pressure (P) = 0.98 atm

Temperature (T) = 307 K

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) =?

The volume of the helium gas can be obtained by using the ideal gas equation as follow:

PV = nRT

0.98 × V = 0.109 × 0.0821 × 307

0.98 × V = 2.7473123

Divide both side by 0.98

V = 2.7473123 / 0.98

V = 2.8 L

Thus, the volume of the helium gas is 2.8 L.

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2 years ago
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More energy than atoms in a liquid state
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What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water by 7.10°c (kb = 0.520°c/m)?
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According to boiling point elevation equation:
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B and E are the answers I would choose.

On the left side, you have 2 nitrogen. On the right, you only have one. So put a 2 in front of the NH3. That gives you balanced nitrogen.

After that step, you have 6 hydrogen (the coefficient x the subscript) on the right, so you need to get 6 on the left. You have 2 hydrogen (subscript). 6/2 = 3, so put a coefficient of 3 in front of the H2, and you’ll have 6 hydrogen.

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3 years ago
Help me with this question please
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D. there is one atom of sulfur and three atoms of oxygen
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