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3 years ago

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the theory if global warming states that the average temperature of the earth has been increasing over time. this theory will be

most strongly affected by scientific studies that

1 answer:

N76 [4]3 years ago

4 0

It will Reveal how the earth's tempature a fluctuated in the past.

(2nd dot down)

Seems like you alredy have it!

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How many mol of oxygen in 2.5 mol of caffein??

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15.9994 is how much oxygen is in 2.5 mol of caffein

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4 years ago

What is the rate law?

Ber [7]

Answer:it’s C

A rate law shows how the rate of a chemical reaction depends on reactant concentration.

Explanation:

A rate law shows how the rate of a chemical reaction depends on reactant concentration. For a reaction such as aA → products, the rate law generally has the form rate = k[A]ⁿ, where k is a proportionality constant called the rate constant and n is the order of the reaction with respect to A.

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2 years ago

How many atoms are in 20.6 moles of curium

Harman [31]

Answer: 1.24 × 10^25

Explanation:

$\frac{20.6 moles}{1}$ × $\frac{6.022 * 10^{24} }{1 Mole}$

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According to the scientific notation rules, the number to the left of the decimal cannot exceed 10 so we have to move the decimal to the left two spaces. With this change, we also have to change the exponent of the 10. Because we moved the decimal point two spaces to the left, that means we have 10^25.

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3 years ago

How does a generator, solar panel, and windmill work? thank you.

vesna_86 [32]

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3 years ago

A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research techni

Lorico [155]

Answer:

The $pK_a$ of the X-281 medicne is 4.29.

Explanation:

Concentration of medicine in solution = $[HA]=c=0.079 M$

$HA\rightleftharpoons A^+H^+$

Initially

c 0 0

At equilibrium

(c-x) x x

The expression of an dissociation constant $K_A$ is given by :

$K_a=\frac{[A^-][H^+]}{[HA]}$

$K_a=\frac{x\times x}{(c-x)}$ ..[1]

The pH of the solution = 2.70

$pH=-\log[H^+]$

$2.70=-\log[H^+]=-\log[x]$

$x=10^{-2.70}=0.001995 M$ ..[2]

Using [2] in [1]

$K_a=\frac{0.001995 M\times 0.001995 M}{(0.079-0.001995 M)}$

$K_a=5.170\times 10^{-5}$

The $pK_a$ of the medicine :

$pK_a=-\log[K_a]=-\log[5.170\times 10^{-5}]=4.29$

The $pK_a$ of the X-281 medicne is 4.29.

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3 years ago