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3 years ago

How does the government rely on scientists?

Chemistry

1 answer:

ivann1987 [24]3 years ago

5 0

They rely on scientists for facts and answers

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A compound contains 25.93% N and the rest is oxygen. What is the empirical formula for the compound?

Mnenie [13.5K]

Answer: NO2

Explanation:

N O

Divide each by its 25.93 74.07

mass number 14 16

2 4

Divide both by the 2 2

smaller (i.e. 2) 1 2

Therefore, the empirical formula = NO2

5 0

3 years ago

Write a summary of a toms

Dmitrij [34]

atoms consist of protons and neutrons in the nucleus , surrounded by electrons that reside in orbitals . Orbitals are classified according to the four quantum number s that represent anyone particular orbitals energy , shape , orientation and the spin of the occupying electron.

hope this helps xx

3 0

3 years ago

H2(g) + Br2(l) ⇄ 2HBr(g) Kc = 4.8 × 108

elena-14-01-66 [18.8K]

Answer:

1.5 × 10⁻⁹M

Explanation:

1. Equilibrium equation

H₂(g) + Br₂(l) ⇄ 2HBr(g)

2. Equilibrium constant

The liquid substances do not appear in the expression of the equilibrium constant.

$k_c=\dfrac{[HBr(g)]^2}{[H_2]}=4.8\times 10^8M$

3. ICE table.

Write the initial, change, equilibrium table:

Molar concentrations:

H₂(g) + Br₂(l) ⇄ 2HBr(g)

I 0.400 0

C - x +2x

E 0.400 - x 2x

4. Substitute into the expression of the equilibrium constant

$4.8\times 10^8=\dfrac{(2x)^2}{0.400-x}$

5. Solve the quadratic equation

192,000,000 - 480,000,000x = 4x²

x² + 120,000,000x - 48,000,000 = 0

Use the quadratic formula:

$x=\dfrac{-120,000,00\pm\sqrt{(120,000,000)^2-4(1)(-48,000,000}}{2(1)}$

The only valid solution is x = 0.39999999851M

Thus, the final concentration of H₂(g) is 0.400 - 0.39999999851 ≈ 0.00000000149 ≈ 1.5 × 10⁻⁹M

8 0

3 years ago

What is the name of Br6F10 ?

sergey [27]

Answer:

Bromine fluoride

8 0

2 years ago

write chemical equations of photosynthesis and cellular respiration and show if carbon is oxidized or reduced

irina [24]

Answer:

Explanation:

The chemical reaction for cellular respiration is as follows -

C₆H₁₂O₆ ( Glucose ) + 6 O₂ ( Oxygen ) --------------> 6CO₂ ( Carbon dioxide ) + 6H₂O ( Water ) + 38 ATP molecules ( Energy ) .

This is an example of oxidation of carbon .

The chemical reaction for photosynthesis is as follows -

6CO₂ ( Carbon dioxide ) + 6H₂O ( Water ) --------------> C₆H₁₂O₆( Glucose ) + 6 O₂ ( Oxygen ).

This is an example of reduction of carbon .

6 0

3 years ago