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4 years ago

The data in an experiment come from observing or measuring the

Chemistry

2 answers:

alexandr402 [8]4 years ago

5 0

Answer: Dependent variable

Explanation:

The dependent variable in an experiment brings the result of the experiment. The independent variable are the factors that is being controlled by the experimenter.

The dependent variable is basically the aim of the experiment. So, it needs to be measured in order to obtain a result.

The dependent variable is dependent on the independent variable. Hence, to obtain data of the experiment dependent variable is observed.

Leni [432]4 years ago

3 0

C. Dependent variable since the dependent variable is always what is being measured

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What does optimal foraging mean?

vovikov84 [41]

Answer:

obtain (food or provisions)

Explanation:

example: a girl foraging grass for oxen

6 0

3 years ago

If the equilibrium concentration of CO is 3.4 × 10–1 M, and the equilibrium concentration

Irina18 [472]

Answer:

4.1M = [CH₃OH]

Explanation:

The equilibrium produced for the reaction between CO and H₂ to form CH₃OH is:

CO + 2 H₂ ⇄ CH₃OH

Where Keq is defined as:

Keq = 26 = [CH₃OH] / [CO] [H₂]²

For concentrations in equilibrium

Replacing in Keq the equilibrium concentrations of CO and H₂, the equilibrium concentration of CH₃COOH is:

26 = [CH₃OH] / [3.4x10⁻¹M] [6.8x10⁻¹M]²

4.1M = [CH₃OH]

5 0

4 years ago

Read 2 more answers

A 1.30M solution of BaCl2 has a density of 1.230 g/ml. a) What is the mole fraction of BaCl2 in this solution?

Elodia [21]

Answer: The mole fraction of barium chloride in the solution is 0.024

Explanation:

We are given:

Molarity of barium chloride solution = 1.30 M

This means that 1.30 moles of barium chloride is present in 1 L or 1000 mL of solution.

To calculate the mass of solution, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of solution = 1.230 g/mL

Volume of solution = 1000 mL

Putting values in above equation, we get:

$1.230g/mL=\frac{\text{Mass of solution}}{1000mL}\\\\\text{Mass of solution}=(1.230g/mL\times 1000mL)=1230g$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Moles of barium chloride = 1.30 moles

Molar mass of barium chloride = 208 g/mol

Putting values in equation 1, we get:

$1.30mol=\frac{\text{Mass of barium chloride}}{208g/mol}\\\\\text{Mass of barium chloride}=(1.30mol\times 208g/mol)=270.4g$

Mass of water = Mass of solution - Mass of barium chloride

Mass of water = 1230 - 270.4 = 959.6 g

Calculating the moles of water:

Given mass of water = 959.6 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

$\text{Moles of water}=\frac{959.6g}{18g/mol}\\\\\text{Moles of water}=53.31mol$

Mole fraction of a substance is given by:

$\chi_A=\frac{n_A}{n_A+n_B}$

For barium chloride:

$\chi_{\text{(barium chloride)}}=\frac{n_{\text{(barium chloride)}}}{n_{\text{(water)}}+n_{\text{(barium chloride)}}}$

$\chi_{\text{(barium chloride)}}=\frac{1.30}{1.30+53.31}\\\\\chi_{\text{(barium chloride)}}=0.024$

Hence, the mole fraction of barium chloride in the solution is 0.024

6 0

4 years ago

A gas is under a pressure of 760torr and occupies volume of 525cm3. If the pressure is doubled, what volume would gas now occupy

german

262. 5cm3.

using the Boyles law formula. p1v1=p2v2

P1=760torr.

v1=525cm³

p2=760×2=1520torr.

v2=?

p1v1=p2v2

760×525=1520×v2

v2=[ 760×525]÷1520

v2= 262.5cm³

when the pressure increases, the volume decreases.

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3 years ago

Explain in terms of intermolecular forces the following: Why NaI has a higher melting point than I2 Because NaI can form hydroge

VARVARA [1.3K]

Answer:

its on goggle ~yoohoo answers

5 0

4 years ago