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3 years ago

Which of the following does not describe a characteristic of carbon?

2 answers:

7 0

The characteristic that is not descriptive of C, would be D. It forms bonds with only itself. It forms bonds with almost all other nonmetals, present, like H,O,N, etc.

BaLLatris [955]3 years ago

3 0

Carbon can bond with other atoms, such a oxygen, to produce carbon monoxide, carbon dioxide etc.

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The rate of disappearance of HBr in the gas phase reaction 2HBr(g) → H2 (g) I2 (g) is 0.190 M s-1 at 150°C. The rate of appearan

Sunny_sXe [5.5K]

Answer:

The rate of appearance of hydrogen gas is 0.095 M/s.

Explanation:

Rate of the reaction is the change in concentration of of any one of the reactants or products per unit time.

$2HBr(g)\rightarrow H_2 (g) I_2 (g)$

Given:

The rate of disappearance of HBr = $-\frac{d[HBr]}{dt}=0.190 M/s$

Rate of the reaction is given by:

$R=-\frac{1}{2}\frac{d[HBr]}{dt}=\frac{1}{1}\frac{d[H_2]}{dt}$

$R=-\frac{1}{2}\frac{d[HBr]}{dt}=\frac{1}{2}\times 0.190 M/s=0.095 M/s$

Rate of appearance of the hydrogen gas:

$\frac{d[H_2]}{dt}=R =0.095 M/s$

The rate of appearance of hydrogen gas is 0.095 M/s.

3 0

4 years ago

A robber is in a fast car, hurrying away from the scene of his crime. His car can go at 150 km/h. He will be safe if he can reac

hjlf

1. time taken by the robber = 0.2 h

2. speed of the police's car = 200 km/h

<h3>Further explanation</h3>

Given

Speed of a robber's car = 150 km/h

Distance to border = 40 km

Required

1. time to reach border

2. speed of police's car

Solution

1. The robber has already travelled 10 km

Distance remains = 30 km

Time to reach = distance : speed = 30 km : 150 km/h = 0.2 h

2. time taken by robbers = time taken by police

distance needed by the police = 40 km

0.2 h = distance : speed

0.2 h = 40 km : speed

speed = 40 km : 0.2 = 200 km/h

7 0

3 years ago

How many dots would go around xenon in electron dot diagram

ratelena [41]

Answer:

Explanation:

Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.

4 0

3 years ago

The letter “E” represents what

babunello [35]

Answer:

I think it stands for Energy, chemistry-wise.

Explanation:

(self-explanatory)

I hope this helps, have a nice day.

5 0

3 years ago

Hydrogen gas and oxygen gas combine to form water. How many grams of oxygen are needed to react with 45.7 grams of hydrogen ?

Julli [10]

The balanced equation:
2 H₂ + O₂ → 2 H₂O

moles of Hydrogen = mass of hydrogen ÷ molar mass of hydrogen
= 45.7 g ÷ 2 g/mol
= 22.85 mol

Now, the mole ratio of O₂ : H₂ is 1 : 2
which means that there are two times as much moles of H₂ as O₂ taking
part in the reaction

Thus since moles of H₂ = 22.85 mol
then moles of O₂ = 22.85 ÷ 2 = 11.425 mol

Mass of O₂ = moles of O₂ × molar mass of O₂

= 11.425 mol × 32 g/mol

= 365.6 g

∴ <span>grams of oxygen are needed to react with 45.7 grams of hydrogen is 365.6g</span>

8 0

3 years ago