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3 years ago

How many neutrons are in selenium -36?

Chemistry

1 answer:

Soloha48 [4]3 years ago

5 0

Selenium (Se) the most common isotope of this element. The nucleus consists of 34 protons (red) and 46 neutrons (blue).

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A piece of gold jewelry weighs 11.54 g and has a volume of 0.675 cm3. The jewelry contains only gold (density = 19.3 g/cm3) and

lbvjy [14]

Answer:

Percentage of gold = 84.6%

Explanation:

Suppose the jewelry has x g of gold and y g of silver

The mass of both is the total mass of the jewelry then:

x + y = 11.54

And as the problem says the total volume is the sum of both volumes.

volume = mass / density

$\frac{x}{19.3} + \frac{y}{10.5} = 0.675$

Solving the system you get:

x = 9.764 g

y = 1.776 g

The percentage of gold in the jewelry is:

$X_{gold} = \frac{9.764}{11.54} * 100 = 84.6\%$

4 0

3 years ago

9. Identify which properties of each of the following elements make them ideal for their uses. KIU A (a) copper and aluminum for

Arisa [49]

Answer:

Each element has its own unique properties. Each contains a different number of protons and neutrons, giving it its own atomic number and mass number. The atomic number of an element is equal to the number of protons that element contains. The mass number is the number of protons plus the number of neutrons of that element. Therefore, it is possible to determine the number of neutrons by subtracting the atomic number from the mass number.

Explanation:

Hope that helps you!

6 0

2 years ago

Which of the following is true about a redox reaction?

bearhunter [10]

AnswerThe correct (A).

Explanation:

The true statement about the redox reaction is In a redox reaction, an electron is lost by the oxidizing agent.

7 0

1 year ago

What is Boyle's law

Vadim26 [7]

Search it up a lot of information should appear. Try that

3 0

3 years ago

Read 2 more answers

Identify the single displacement reaction. 2H 2 + O 2 ⟶ 2H 2O Al 2S 3 ⟶ 2Al + 3S Cl 2 + 2KBr ⟶ 2KCl + Br 2 C 4H 12 + 7O 2 ⟶ 6H 2

ozzi

Answer: $Cl_2+2KBr\rightarrow 2KCl+Br_2$

Explanation:

A single displacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

$Cl_2+2KBr\rightarrow 2KCl+Br_2$

Synthesis reaction is defined as the reaction where substances combine in their elemental state to form a single compound. $2H_2+O_2\rightarrow 2H_2O$

Decomposition reaction is defined as the reaction where a single substance breaks down into two or more simpler substances.

$Al_2S_3\rightarrow 2Al+3S$

Combustion is a type of chemical reaction in which hydrocarbons burn in the presence of oxygen to form carbon dioxide and water along with heat.

$C_4H_{12}+7O_2\rightarrow 6H_2O+4CO_2$

6 0

3 years ago