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Digiron [165]
3 years ago
9

Question 1 Multiple Choice Worth 2 points) (03.05 LC) Which statement is true?

Chemistry
1 answer:
Tasya [4]3 years ago
7 0

Answer:

I need more information. What is the question?

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To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which scientist?
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Based upon Max Planck's theory of black-body radiation, Einstein theorized that the energy in each quantum of light was equal to the frequency multiplied by a constant, later called Planck's constant. A photon above a threshold frequency has the required energy to eject a single electron, creating the observed effect.
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Which statement best describes what makes a base weak?
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A base is weak when only a little of it dissolved in Water.

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Which element is a nonmetal?
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Answer:oxygen

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What is the empirical formula of a compound containing 90 grams carbon, 11 grams hydrogen, and 35 grams nitrogen?
Anvisha [2.4K]

Answer:

= C3H4N

Explanation:

We are given; 90 grams carbon, 11 grams hydrogen, and 35 grams nitrogen.

We first calculate the number of moles of each element.

Carbon = 90g/12 g/mol

            = 7.5 moles

Hydrogen = 11 g/ 1 g/mol

                 = 11 moles

Nitrogen = 35 g/ 14 g/mol

               = 2.5 moles

The we get the mole ratio of the elements;

= 7.5/2.5 : 11/2.5 : 2.5 /2.5

= 3 : 4.4 : 1

= 3 : 4 : 1

Therefore;

The empirical formula will be; C3H4N

6 0
3 years ago
Question 6 A certain ionic compound has a solubility in water of at . Calculate the greatest mass of that could be dissolved in
emmainna [20.7K]

Complete Question:

A certain ionic compound X has a solubility in water of .765g/ml at 5 degrees C. Calculate the mass of X that's dissolved in 3 L of a saturated solution of X in the water at this temp. Be sure your answer has the correct unit symbol and significant digits.

Answer:

2.29 kg

Explanation:

A saturated solution is a solution that has the maximum amount of solute diluted at it, so if more solute is added, it will precipitate. The solutions can also be unsaturated (when more solute can be dissolved) or supersaturated (when there is more solute dissolved than the maximum. It's a very unstable solution).

The saturation is measured by the solubility, which indicates how much mass of the solute can be added to a certain volume of the solvent. So, the solubility (S) is the mass (m) divided by the volume (V).

For a solution with 3 L = 3000 mL,

S = m/V

0.765 = m/3000

m = 3000 * 0.765

m = 2295 g

m = 2.29 kg

7 0
3 years ago
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