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3 years ago

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Chemistry

2 answers:

Sloan [31]3 years ago

5 0

Answer: developing a theory

Explanation: Scientific method are the methods which help us to get acknowledged with the new facts and theories which have been tested by the scientists through rigorous experimentation.

So the first step of scientific method is proposing a theory in which the scientists propose their facts and views under the name of the theory.

After proposing the hypothesis, testing of the hypothesis will take place by conducting an experiment. After the experiment has been conducted then only they can develop a theory and this will be their final step.

Thus the last step will be the 'developing a theory' .

mestny [16]3 years ago

4 0

Well the first step would be proposing a hypothesis, then you would test the hypothesis by conducting an experiment. So that means that the last step would be to develop a theory. Hope this helps!

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The periodic table is organized left to right by __________.

Romashka [77]

Answer:

Metals, metalloids, non-metals

Explanation:

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3 years ago

Read 2 more answers

Calculate each of the following quantities. (a) Mass (g) of solute in 175.4 mL of 0.267 M calcium acetate WebAssign will check y

ss7ja [257]

Answer:

a) 7.40 grams

b) 0.213 M

c) 102 moles

Explanation:

(a) Mass (g) of solute in 175.4 mL of 0.267 M calcium acetate

Step 1: Data given

Volume = 175.4 mL = 0.1754 L

Molarity = 0.267 M

Molar mass = 158.17 g/mol

Step 2: Calculate moles

Moles = molarity * volume

Moles = 0.267 M * 0.1754 L

Moles = 0.0468 moles

Step 3: Calculate mass

Mass = 0.0468 moles * 158.17 g/mol

Mass = 7.40 grams

b) Molarity of 597 mL solution containing 21.1 g of potassium iodide

Step 1: Data given

Volume = 597 mL = 0.597 L

Mass = 21.1 grams

Molar mass KI = 166.0 g/mol

Step 2: Calculate moles KI

Moles KI = 21.1 grams / 166.0 g/mol

Moles KI = 0.127 moles

Step 3: Calculate molarity

Molarity = moles / volume

Molarity = 0.127 moles / 0.597 L

Molarity = 0.213 M

Step 1: Data given

Volume = 145.6 L

Molarity = 0.703 M

Step 2: Calculate moles

moles = molarity * volume

Moles = 0.703 M * 145.6 L

Moles = 102 moles

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3 years ago

How does the surface of the earth change slowly over time

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Some changes are due to slow processes, such as erosion and weathering, and some changes are due to rapid processes, such as landslides, volcanic eruptions, and earthquakes.

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3 years ago

During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form so

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HCl + NaOH ----> NaCl + H2O

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3 years ago

A buffer solution contains a weak acid, HA , and its conjugate base, A − . The buffer solution has a pH of 5.76 , and the weak a

ludmilkaskok [199]

Answer:

The relationship is expressed as follows: $K_{a} = \frac{[H+][A-]}{[HA]}$

Explanation:

Most acidic substances are weak acids and are therefore only partially ionized in acqeous solution. We cab use the equilibrium constant for the ionization of acid to express the extent to which the weak acid ionizes. If we represent a general weak acid as HA, we can write the equation for its ionization reaction like this:

$K_{a} = \frac{[H+][A-]}{[HA]}$

To calculate the pH of a weak acid, we use the equilibrium concentration of the reacted species and product.

Take for example:

HA → H + A⁻

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Knowing that x amount of acid reacts, we can solve like this:

HA → H + A⁻

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thus, the pH of the acid is equals to H+ (initial) - H+ (equilibrium) ≈ H+ (initial)

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4 years ago