A control variable is any element of an experiment that:

Chemistry

2 answers:

Nataly_w [17]4 years ago

7 0

Is held constant throughout the experiment

Anna007 [38]4 years ago

3 0

A controled variable is the variable that remains the same.

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The sum of all chemical reactions that occur in a cell is called:.

vodomira [7]

Answer:

Metabolism

Explanation:

The sum of the chemical reactions that take place within each cell of a living organism and that provide energy for vital processes and for synthesizing new organic material.

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2 years ago

A sample of gas in a balloon has an initial temperature of 20. ∘C and a volume of 1.92×103 L . If the temperature changes to 68

morpeh [17]

Answer:

$\boxed{2.23 \times 10^{3} \text{ L}}$

Explanation:

The pressure is constant, so we can use Charles' Law.

$\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}$

Data:

V₁ = 1.92 × 10³ L; T₁ = 20 °C

V₂ = ?; T₂ = 68 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = (20 + 273.15) K = 293.15 K

T₂ = (68 + 273.15) K = 341.15 K

(b) Calculate the volume

$\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}$