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3 years ago

Please awnser these questions on the picture 50 points

Chemistry

2 answers:

harkovskaia [24]3 years ago

7 0

1 － valence electrons
2 － electrons
3 － two electrons
4 － eight electrons
5 － eighteen electrons
6 － nucleus
7 － protons
8 － neutrons
9 － shell or energy level
10－ atomic number
11 － element symbol
12 － atomic name
13 － atomic mass

Ivanshal [37]3 years ago

6 0

Answer:

1－ valence electrons

2 － electrons

3 － two electrons

4 － eight electrons

5 － eighteen electrons

6 － nucleus

7 － protons

8 － neutrons

9 － shell or energy level

10－ atomic number

11 － element symbol

12 － atomic name

13 － atomic mass

Explanation:

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Create an element card that has the following information:

Shtirlitz [24]

Answer:

Atomic number:6

Atomic mass:12.011

Chemical symbol:C

Name of element: Carbon, Carbone (french)

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Explanation:

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4 years ago

How many grams of glucose would be found in 1l of a 22% solution?

garik1379 [7]

40 g glucose

Explanation:

I have to assume that you are asking about a 2% m/v solution ( Note that specifying 2% in isolation has no meaning )

2% m/v glucose solution is : 2 g glucose in 100 mL solution

Which is ( multiply by 10): 2% m/v = 20 g glucose in 1000 mL ( = 1.0 L) solution

And so 2%m/v = 40 g glucose in 2000 mL or 2.0 L solution

Answer: 40 g glucose.

6 0

2 years ago

Which one of the following statements is true?A. Some real gases have lower pressures than that calculated for the ideal gas bec

NNADVOKAT [17]

Answer:

A. Some real gases have lower pressures than that calculated for the ideal gas because of attraction between molecules.

Explanation:

At room temperature and moderately low pressures ideal gases among other assumptions:

I. Do not attract or repel each other.

II. Have negligible volume relative to the volume of the containing vessel.

Thus the ideal gas equation:

PV = nRT

Where P = gas pressure = gas molecules' collision with the walls of the containing vessel.

V = volume occupied by the gas sample.

T = Kelvin temperature of the gas

n = number of mole of the gas present.

R = proportionality constant called the molar gas constant = 0.0821 L. atm/K.mol.

However, at low temperatures and high pressures, gases exhibit real behaviors and the

I. attractive forces between the gas molecules may not be negligible.

II. volume of the gas molecules may not be negligible relative to the volume of the container.

At low temperatures, the average kinetic energy of the gas molecules decreases which prevents the molecules breaking free from their molecular attraction.

At high pressures, the density of the gas increases and the molecules come closer to one another. This increases the intermolecular forces between the gas molecules, increases the number of molecules found per unit volume and lowers their speed moving towards the containing wall thus lowering the pressure the gas would exert than if it were in an ideal behavior.

van der Waals corrected the actual pressure and volume of real gases as follows:

( P + an^2/V^2 ) ( V – nb ) = nRT

Where n^2/V^2 = number of molecules per unit volume.

P = observed pressure.

( V – nb ) = effective volume of the gas.

6 0

4 years ago

Definition: This is the phase of matter with no fixed shape or volume.

Anna71 [15]

Gas.
A gas has no fixed shape as it takes shape of container.
It has no fixed volume as it depends on the container.

5 0

4 years ago