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3 years ago

Help ASAP I will mark brainliest for the correct answer !!!⚡️⚡️⚡️

Chemistry

2 answers:

kobusy [5.1K]3 years ago

8 0

Which fractions are equivalent to 0.875?

Tcecarenko [31]3 years ago

5 0

Answer:

A) 0.5h

Explanation:

Using the formula,

speed= $\frac{distance}{time}$

Substituting given values

1224=612/time

time=0.5h

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Use the reaction 2NO 2 (g) = N 2 O 4 (g) to answer the following question:

anyanavicka [17]

Answer:

According to Le Chatelier’s Principle, a stress placed on a system at equilibrium will cause the equilibrium to shift to counteract the stress. For example, a temperature increase in the above reaction will favor the reverse reaction to use the excess heat and form brown NO2 gas. A temperature decrease in the above reaction favors the forward reaction to produce heat and form colorless N2O4 gas.

3 0

3 years ago

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10. A 2.36-gram sample of NaHCO3 was completely decomposed in an

Airida [17]

Answer:

0.79 g

Explanation:

Let's introduce a strategy needed to solve any similar problem like this:

Apply the mass conservation law (assuming that this reaction goes 100 % to completion): the total mass of the reactants should be equal to the total mass of the products.

Based on the mass conservation law, we need to identify the reactants first. Our only reactant is sodium bicarbonate, so the total mass of the reactants is:

$m_r=m_{NaHCO_3}=2.36 g$

We have two products formed, sodium carbonate and carbonic acid. This implies that the total mass of the products is:

$m_p=m_{Na_2CO_3}+m_{H_2CO_3}$

Apply the law of mass conservation:

$m_r=m_p$

Substitute the given variables:

$m_{NaHCO_3}=m_{Na_2CO_3}+m_{H_2CO_3}$

Rearrange for the mass of carbonic acid:

$m_{H_2CO_3}=m_{NaHCO_3}-m_{Na_2CO_3}=2.36 g - 1.57 g=0.79 g$

8 0

4 years ago

It was mentioned that you should not expect the pH of distilled water to be 7.00 as ordinarily measured in the laboratory. What

Lina20 [59]

Answer:

Carbon dioxide

Explanation:

<em> laboratory to have a pH of less than 7.0.</em>

Carbon (IV) oxide in the atmosphere is capable of dissolving into the distilled water to form a weak acid. Any pH that is less than 7.0 is acidic while any pH above 7.0 is alkaline or basic.

First, the carbon (IV) oxide enters the water through an equilibrium with the atmosphere:

$CO_2 (aq) CO_2 (g)$

Thereafter, aqueous carbon (IV) oxide can then react with water to form a weak carbonic acid:

$CO_2 (aq) + H_2O --> H_2CO_3 (aq)$

3 0

4 years ago

Which of the following is the correct Lewis structure for ammonia (NH3)? Note: Hydrogen and nitrogen have one and five valence e

mart [117]

Three hydrogen will provide three valence electrons and nitrogen has five valence electrons all in all they 8 valence electron
**
H*«N«*H=NH3
«*
H

4 0

4 years ago

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Three resonance structures of the given anion are possible. One is given, but it is incomplete. Complete the given structure by

kondor19780726 [428]

Answer:

Explanation:

The missing incomplete resonance structure is attached in the image below. From there, we can see the addition of the nonbonding electrons and its' formal charge which makes the resonance structure a complete resonance structure. The others two resonance structure that can be derived from the complete structure is also shown in the image. Out of these three structures, the structure that contributes most to the hybrid is the structure with the negative charge on the oxygen.

5 0

3 years ago