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erma4kov [3.2K]
3 years ago
7

I need help on this asap

Chemistry
2 answers:
dlinn [17]3 years ago
6 0
1.hydrogen
2.carbon
3.argon
4.titanium
5.cesium
wolverine [178]3 years ago
6 0
6 is boron
7 is yttrium
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How does the volume occupied by a cubic centimeter compare with the volume occupied by a millimeter
Bad White [126]
I'm pretty sure it's the same 2mm = 2cc = 2c^2
7 0
3 years ago
A certain element exists as two different isotopes. 65.0% of its atoms have a mass of 24 amu and 35.0% of its atoms have a mass
Sauron [17]

Answer:

24.7 amu

Explanation:

An isotope is when an element can have different number of neutrons but they have same number of protons.

In order to calculate the average atomic mass with the given information do the following operations:

First change de percentages to fractional numbers, divide by 100.

I like to make a table, to organize all data and I believe is easier to understand.

65/100 = 0.65

35/100 = 0.35

% fraction

65.0 0.65

35.0 0.35

total100.0 1

Now multiply each mass with their corresponding fraction

24 (0.65) = 15.6

26 (0.35) = 9.1

%    fraction uma uma

65.0 0.65 24 15.6

35.0 0.35 26 9.1

total100.0    1          24.7

Finally you add the resulting mass and the units will be in uma.

15.6+9.1 = 24.7

Therefore the average atomic mass of this element will be 24.7 uma.

Check the table in the document attached

Download xlsx
4 0
3 years ago
A sample of gas originally at 25 C and 1.00 atm pressure in a 2.5 L container is allowed to expand until the pressure is 0.85 at
aivan3 [116]

Answer:

Final volumeof the gas = 2.84 L

Explanation:

The formular to be used here is the general gas equation. the formular is being used because it gives the relationship between the three gas parameters (volume, temperature and pressure) mentioned.

The general gas equation is given as;

\frac{P1V1}{T1} = \frac{P2V2}{T2}

where;

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = Final pressure

V2 = Final volume

T2 = Final temperature

From the question,

P1 = 1.00 atm

P2 = 0.85atm

T1 = 25C + 273 = 298K (Converting to kelvin)

T2 = 15C + 273 = 288K (Converting to kelvin)

V1 = 2.5L

V2 = ?

from the equation, making V2 subject of formula we have;

V2 = \frac{T2P1V1}{T1P2}

V2 = (1*2.5*288)/(298*0.85) = 2.84 L.

5 0
3 years ago
Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas
nataly862011 [7]

57.1g * 6.022*10^23 / 22.9 * 2 = 7.51*10^23 molecules

3 0
3 years ago
Which Locations are likely to have subatomic particles with the GREATEST mass?
wlad13 [49]

2 and 3, because there are the protons and neutrons which have a greater mass than the electrons which are found in the locations 1 and 4.

Explanation:

The atom contains a nucleus, which is made from protons and neutrons, and electrons which are found around the nucleus.

The mass of the atoms is concentrated in the very tiny space represented by the nucleus. Of course the electrons have a mass too, but is very small compared to the protons and neutrons, and we usually neglect its mass.

Learn more about:

subatomic particles

brainly.com/question/7221719

brainly.com/question/1527888

#learnwithBrainly

8 0
3 years ago
Read 2 more answers
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