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3 years ago

If I combine atoms then I must be performing which process?

Chemistry

2 answers:

Evgesh-ka [11]3 years ago

6 0

The answer is fusion. hope this helps!

solmaris [256]3 years ago

4 0

Answer:

D: fussion

Explanation:

The process called nuclear fussion.

for example, four hydrogen atoms combine in a nuclear fussion reaction to form one helium atom.

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The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?

Natalija [7]

You got the answer correct. If you would double check
given:C (12 g/mol) H (1 g/mol).

12(8) + 1(8) = 104 g/mol

and for C2H4
12(2)+1(4) = 28g/mol

Also, chemical formula of styrene is<span> C6H5CH=CH2.</span>

7 0

3 years ago

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Why is our use of electric power increasing?

miv72 [106K]

Answer: leaving it on

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3 years ago

The density of gold is 19.3 g/cm³. What is the mass of 11.3 cm³ of gold?

telo118 [61]

Answer:

218.09g

Explanation:

the formula for density is mass/volume

you have volume so rlly what you have is 19.3g/cm3=m/11.3cm3

so mass equals density x volume

and 19.3 x 11.3 = 218.09

4 0

3 years ago

How many moles of gas would you have if you have a volume of 38.0 L under a pressure of 1430 mmHg at standard temperature

seraphim [82]

Answer: There are 3.2 moles of gas if you have a volume of 38.0 L under a pressure of 1430 mmHg at standard temperature.

Explanation:

Given: Volume = 38.0 L

Pressure = 1430 mm Hg (1 mm Hg = 0.00131579 atm) = 1.9 atm

Temperature = 273.15 K

Using ideal gas equation, the moles of gas will be calculated as follows.

$PV = nRT\\$

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T =temperature

Substitute the values into above formula as follows.

$PV = nRT\\1.9 atm \times 38.0 L = n \times 0.0821 L atm/mol K \times 273.15 K\\n = \frac{1.9 atm \times 38.0 L}{0.0821 L atm/mol K \times 273.15 K}\\= 3.2 mol$

Thus, we can conclude that there are 3.2 moles of gas if you have a volume of 38.0 L under a pressure of 1430 mmHg at standard temperature.

5 0

3 years ago

What property did mendeleev use to organize his periodic table?

Over [174]

<h2>Answer:</h2>

Mendeleev grouped elements with similar chemical properties (especially valency) together and noted their mass as well. At first he only wrote down 9 elements:

Cl 35.5, K 39, Ca 40

Br 80, Rb 85, Sr 88

I 127, Cs 133, Ba 137

He added more elements to his first period table little by little, putting them into groups by valency and sorting them within their group by mass. He noted that the mass in most cases also increases by group within a period.

On 6 March 1869, he presented his work "The Dependence between the Properties of the Atomic Weights of the Elements" for the first time. It stated that:

The elements, if arranged according to their atomic weight, exhibit an apparent periodicity of properties.

Elements which are similar regarding their chemical properties either have similar atomic weights (e.g., Pt, Ir, Os) or have their atomic weights increasing regularly (e.g., K, Rb, Cs).

The arrangement of the elements in groups of elements in the order of their atomic weights corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F.

The elements which are the most widely diffused have small atomic weights.

The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.

5 0

2 years ago