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3 years ago

(01.01 MC)

Chemistry

2 answers:

user100 [1]3 years ago

5 0

The dependent variable is plant height.

The dependent variable (plant height) is the property that changes as a result something the scientist does.

The independent variable is the property that the scientist changes systematically (the amount of CO_2) to see its effect.

The number of plants and the types of plants are uncontrolled variables. They may or may not affect the heights of the plants.

madreJ [45]3 years ago

3 0

Answer: It is the number of plants

Explanation:

The scientist does not care about the height of the plants but the quantity of them.

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3 years ago

An unknown sample weighing 0.3512g was added to 20.0 mL of cyclohexane. The density of cyclohexane is 0.779g/mL, and the freezin

rjkz [21]

Explanation:

It is known that density is mass of a substance divided by its volume.

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Therefore, calculate the mass of cyclohexane as follows.

mass of cyclohexane = Density × volume

= $0.779 g/mL \times 20 mL$

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$\Delta T_{f} = K_{f} \times molality$

$5.2 = 20 \times molality$

molality = $\frac{5.2}{20}$

= 0.26 m

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Mathematically, molality = $\frac{\text{no. of moles}}{\text{mass of solvent}}$

0.26 = $\frac{\text{no. of moles}}{0.01558}$

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As, No. of moles = $\frac{mass}{\frac{molar mass}}$

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Thus, we can conclude that molar mass of unknown substance is 87.0 g/mole.

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3 years ago

Which kind of element forms covalent bonds give two reasons for this

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