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2 years ago

Scientists test a hypothesis by?

Chemistry

1 answer:

Novay_Z [31]2 years ago

6 0

They test the hypothesis by experimentation.

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Add the polynomials (7x^3-2x^2-12)+(3x^3-8x^2+10x)

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10 x ^3 − 10 x ^2 + 10 x − 12

Explanation:

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2 years ago

The pictures to the right, show two different models of the atom. Type in the letter of your answer. Which model best represents

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Answer:

Model B

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2 years ago

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When the following equation is balanced, what is the coefficient for CaCl2 ?

USPshnik [31]

To know if an equation is balanced you need to check and see how much of each molecule is on either side of the arrow. Right now you have 1-Ca, 2-H, 2-Cl on the left side of the arrow and 1-Ca, 2-Cl, and 2-H on the right side too. Because all the molecules are equal on both sides this means that the equation is balanced. So in front of the CaCl2 there is an assumed coefficient of 1. The answer is 1.

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2 years ago

At a given temperature, K = 1.3x10^-2 for the reaction:

son4ous [18]

Answer:

a) 0.11

b)76.9

c) 8.8

d) 1.7*10^-4

Explanation:

Step 1: Data given

K = 1.3 * 10^-2 for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)

Step 2: Formula of K

aA(g) + bB(g) ⇌ cC(g) + dD(g)

K = [C]^c *[D]^d / [A]^a * [B]^b

K = 1.3 * 10^-2 = [NH3]² / [H2]³*[N2]

Step 3:

a) 1/2N2 + 3/2H2(g) ⇌ NH3(g)

N2(g) + 3H2(g) ⇌ 2NH3

1/2N2 + 3/2H2(g) ⇌ NH3(g) =>K' = $\sqrt{K}$

K' = $\sqrt{1.3*10^-2}$ = 0.11

N2(g) + 3H2(g) ⇌ 2NH3

2NH3(g) ⇌ N2(g) + 3H2(g) =>K' = 1/K

K' = 1/(1.3*10^-2) = 76.9

c. NH3(g) ⇌ 1/2 N2(g) + 3/2H2(g)

N2(g) + 3H2(g) ⇌ 2NH3

NH3(g) ⇌ 1/2 N2(g) + 3/2H2(g)

=>K' = $\frac{1}{\sqrt{K} }$

K' = $\frac{1}{\sqrt{1.3*10^-2} }$

K' = 8.8

d. 2N2(g) + 6H2(g) ⇌ 4NH3(g)

N2(g) + 3H2(g) ⇌ 2NH3

2N2(g) + 6H2(g) ⇌ 4NH3(g)

K' = K²

K' = (1.3*10^-2)²

K' = 1.7 *10 ^-4

4 0

2 years ago