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Serhud [2]
3 years ago
14

Approximately how many elements are there that combine chemically in a great number of ways to produce compounds? A. 25 B. 50 C

.75 D.100
Chemistry
2 answers:
Arturiano [62]3 years ago
8 0
100 as there’s approximately 100 discovered elements
zhannawk [14.2K]3 years ago
8 0

Answer:

The correct answer is D.

Explanation:

A chemical compound is any substance composed of identical molecules formed by atoms of two or more chemical elements. All matter in the universe is composed of atoms of more than 100 different chemical elements. These elements are found in pure form and combined form in chemical compounds.

Have a nice day!

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In the short a rainstorm might damage buildings and habitats by a river to flood. What positive effect might a rainstorm have in
ra1l [238]

Answer:

The rainstorm can dehydrate the plants

7 0
3 years ago
1. Which type of telescope is most useful for detecting a star that emits very long
podryga [215]
Which type of telescope is most useful for detecting a star that emits very long electromagnetic waves?

A. a radio telescope B. an X-ray telescope C. an optical telescope D. a gamma ray telescope
A.)a radio telescope
5 0
3 years ago
The solid block shown below has a mass of 146 grams. THE DIMENSIONS OF THE BLOCK ARE- 3.0 cm by 4.5 cm by 7.0 cm. What is the bl
Amiraneli [1.4K]

Explanation:

D=m÷v

D=146÷(3×4.5×7)

D=146÷94.5

D=1.54g/cm^3

5 0
2 years ago
What is the oxidation state for the oxygen atom in na 2 ​ o 2 ​ ?
elixir [45]
Na_{2}O_{2}

Na in compounds has oxidation number +1 only.

So,  Na_{2}^{+1}O_{2}^{x}

2*(+1)+2x=0, x=-1.

Oxidation number oxygen in Na_{2}O_{2} is - 1.
4 0
2 years ago
Calculate the molality of the salt solution. Express your answer to four significant figures and include the appropriate units.
Thepotemich [5.8K]

Answer:

m = 2.955x10⁻² mol/kg

X = 5.323x10⁻⁴ mol NaCl/Total moles

(w/w)% = 0.1726%

ppm = 1726 mg/kg

Explanation:

Molality is the ratio between moles of solute per kg of solution.

As the solution is 2.950×10⁻² mol/L, mililters are 999.2mL and density is 0.9982 g/mL, molality is:

m = 2.950×10⁻² mol/L×(1L/0.9982kg) = <em>2.955x10⁻² mol/kg</em>

Mole fraction is moles of NaCl/total moles.

Moles of H₂O are:

999.2mL×(0.9982g/mL)×(1mol/18,02g) = 55,35 moles of H₂O

Moles of NaCl are:

2.950×10⁻² mol/L×(0.9992L)= 2.950×10⁻² mol of NaCl

mole fraction is:

X = 2.950×10⁻² mol of NaCl / (2.950×10⁻² mol of NaCl+55.35mol water) = <em>5.323x10⁻⁴ mol NaCl/Total moles</em>

Mass of NaCl is:

2.950×10⁻² mol of NaCl×(58.44g/mol) = 1.724g of NaCl

Mass of water is:

55.35mol water×(18.02g/mol) = 997.4g of H₂O

(w/w)% is:

1.724g of NaCl / (1.724g of NaCl+997.4g of H₂O) ×100 = <em>0,1726%</em>

<em></em>

Parts per million is mg of NaCl per kg of solution, that is:

1724mg of NaCl / 0.999124g = <em>1726 ppm</em>

<em></em>

I hope it helps!

5 0
2 years ago
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