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2 years ago

1. 2. LEVEL1 A. In each group, choose the objects that has the property given in brackets

Chemistry

1 answer:

Leya [2.2K]2 years ago

5 0

Answer:

1. Diamond

2. The Image to the far right. It's rice I believe.

Explanation:

A lustrous material is a material that shine or usually reflect light. Fire isn't a material and the powder is dull and doesn't shine. In this case the diamond is a lustrous material and not a metal.

An edible substance is anything thing that can be consumed as food. Soap is consumable and the blue picture is definetly not either so we conclude that the rice is the edible option.

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Calculate the number of molecules in a deep breath of air whose volume is 2.15 L at body temperature, 37 ∘C, and a pressure of 7

Zinaida [17]

PV = nRT
R = 0.0821 L * atm / mol * K
(ideal gas constant)

First, convert 735 torr to atm. Divide by 760.
(1 atm = 760 torr)

735 torr * 1 atm / 760 torr = 0.967 atm
Then, convert 37 C to Kelvin. Just add 273.
37 C = 310K

n = PV / RT
= (0.967)(2.07) / (0.0821)(310)
= 0.0786 mol

<span>0.0786 mol * 6.02 * 10^23 molecules / 1 mol = 4.73 * 10^22 molecules </span>

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3 years ago

Read 2 more answers

If the initial volume is 55ml and the final volume after some rocks of sandstone are added is 65ml what is the volume of the chi

AfilCa [17]

Answer:

Volume = 10ml

Density = 1/5 g/ml or 0.20g/ml

Explanation:

The rocks are 10ml since the initial volume went up by 10.

Since density = mass/volume, you divide 2 by 10.

D = 2/10

D = 1/5 g/ml or 0.20g/ml

(Unit is g/ml aka grams/millileter)

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3 years ago

Explain why pentane has a higher boiling point than butane

creativ13 [48]

Answer: Larger molecules have stronger London forces.

Explanation:

Pentane therefore has a stronger force than butane.

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3 years ago

An atom that normally has __________ electrons in its outer (valence) shell tends not to form chemical bonds with other atoms.

goblinko [34]

8 valence shell electrons.

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3 years ago

At equilibrium at 2500K, [HCl]=0.0625M and [H2]=[Cl2]=0.00450M for the reaction H2+Cl2 ⇌ HCl.

ASHA 777 [7]

Answer:

a. $H_2+Cl_2 \rightleftharpoons 2HCl$

b. K = 192.9

c. Products are favored.

Explanation:

Hello!

a. In this case, according to the unbalanced chemical reaction we need to balance HCl as shown below:

$H_2+Cl_2 \rightleftharpoons 2HCl$

In order to reach 2 hydrogen and chlorine atoms at both sides.

b. Here, given the concentrations at equilibrium and the following equilibrium expression, we have:

$K=\frac{[HCl]^2}{[H_2][Cl_2]}$

Therefore, we plug in the data to obtain:

$K=\frac{(0.0625)^2}{(0.00450)(0.00450)}\\\\K=192.9$

c. Finally, we infer that since K>>1 the forward reaction towards products is favored.

Best regards!

8 0

3 years ago