20 POINTS!!!!

Salt water is classified as a __________ and a solution. compound mixture

REY [17]

Answer: compound

Explanation: because the hydrogen molecules and the oxygen molecules are chemically bonded together unlike in a mixture

4 0

3 years ago

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A sample of 4.0 L of nitrogen, at 1.2 atmospheres, is transferred to a 12 L container.

Zielflug [23.3K]

Answer:

The pressure will be 0.4 atm.

Explanation:

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.

As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P*V= k

If you initially have the gas at a volume V1 and press P1, when the conditions change to a volume V2 and pressure P2, the following is satisfied:

P1*V1= P2*V2

In this case:

P1= 1.2 atm
V1= 4 L
P2= ?
V2= 12 L

Replacing:

1.2 atm* 4 L= P2* 12 L

Solving:

$P2=\frac{1.2 atm*4 L}{12 L}$

P2= 0.4 atm

The pressure will be 0.4 atm.

7 0

3 years ago

Is a rusting bicycle a chemical change?

mojhsa [17]

Yes, rusting is a chemical change

4 0

3 years ago

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The decomposition of ethylene oxide(CH₂)₂O(g) → CH₄(g) + CO(g)is a first order reaction with a half-life of 58.0 min at 652 K. T

olga55 [171]

Answer:

Half-life at 629K = 252.4min

Explanation:

Using Arrhenius equation:

$ln\frac{K_1}{K_2} = \frac{Ea}{R} (\frac{1}{T_2} -\frac{1}{T_1})$

And as Half-life in a first order reaction is:

$t_{1/2}=\frac{ln2}{K}$

We can convert the half-life of 58.0min to know K₁ adn replacing in Arrhenius equation find half-life at 629K:

$58.0min=\frac{ln2}{K}$

K = 0.01195min⁻¹ = K₁

$ln\frac{0.01195min^{-1}}{K_2} = \frac{218kJ/mol}{8.314x10^{-3}kJ/molK} (\frac{1}{629K} -\frac{1}{652K})$

$ln\frac{0.01195min^{-1}}{K_2} =1.47$

$\frac{0.01195min^{-1}}{K_2} =4.35$

K₂ = 2.75x10⁻³ min⁻¹

And, replacing again in Half-life expression:

$t_{1/2}=\frac{ln2}{2.75x10^{-3}min^{-1}}$

5 0

3 years ago

Determine the combining capacity of iron in the compound FeCl3

Kipish [7]

Answer:

The combining capacity or power of iron in FeCl3 is +3

Explanation:

The combining capacity or power of an atom of an element is the charge which that atom possesses when it combines with other atoms to form compounds. It is also known as valency or valence.

To determine the combining capacity of iron in FeCl3, the following steps are followed:

1. Group 7 elements have a combining capacity of -1, therefore, the combining capacity of Chlorine in FeCl3 is -1

2. The sum of oxidation numbers of a neutral compound is zero, therefore, Fe + 3 × Cl = 0

Let, the combining capacity of Iron be y.

y + (-1 × 3) = 0

y - 3 = 0

y = +3

Therefore, the combining capacity of iron in FeCl3 is +3

5 0

3 years ago