Macie performs an experiment and finds evidence that does not agree with a theory. Is the evidence enough to change the theory?

1 answer:

5 0

I would say that it is not enough evidence to change the theory because she has only done the experiment once and may have gotten something wrong. She will need to repeat her experiment at least 3 times her to see if she gets the same answers or i5 changes.

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Will mark as Brainliest.

xeze [42]

Spontaneous reaction.

3 0

4 years ago

The normal freezing point of water is 0.00 ⁰C. What is the freezing point of a solution containing450.0 mg of ethylene glycol (M

anyanavicka [17]

Answer:

Freezing T° of solution = - 8.98°C

Explanation:

We apply Freezing point depression to solve this problem, the colligative property that has this formula:

Freezing T° of pure solvent - Freezing T° of solution = Kf . m

Kf = 1.86°C/m, this is a constant which is unique for each solvent. In this case, we are using water

m = molality (moles of solute / 1kg of solvent)

We convert the mass of solvent from g to kg

1.5 g . 1kg/1000g = 0.0015 kg

We convert the mass of solute, to moles. Firstly we make this conversion, from mg to g → 450mg . 1g/1000mg = 0.450 g

0.450 g. 1mol / 62.07g = 7.25×10⁻³ moles

Molality → 7.25×10⁻³ mol / 0.0015 kg = 4.83 m

- Freezing T° of solution = 1.86°C /m . 4.83 m - Freezing T° of pure solvent

-Freezing T° of solution = 1.86°C /m . 4.83 m - 0°C

Freezing T° of solution = - 8.98°C

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3 years ago

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Is magnesium a metal or a nonmetal? How many valence electrons does a magnesium atom have?

MatroZZZ [7]

Magnesium is classified as a metal. Magnesium has two valence electrons

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4 years ago

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Which statement correctly describes the Ka of a weak acid?

katovenus [111]

The answer is D) <span>The Ka is small, and the equilibrium favors reactants.

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3 years ago

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Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 21 ∘C∘C. Express the pressure

Volgvan

The question is incomplete, complete question is ;

A deep-sea diver uses a gas cylinder with a volume of 10.0 L and a content of 51.8 g of $O_2$ and 33.1 g of He. Calculate the partial pressure of each gas and the total pressure if the temperature of the gas is 21°C.Express the pressures in atmospheres to three significant digits separated by commas.