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Andrej [43]
3 years ago
12

which count of subatomic particles gives an atom its unique identity as an element, and represents its atomic number? a. the num

ber of protons b. the number of neutrons c. the number of electrons d. the number of neutrons plus the number of protons
Chemistry
2 answers:
Arada [10]3 years ago
7 0
The subatomic particles that identifies an element and also represents its atomic number would be A. The number of protons.
joja [24]3 years ago
3 0

Answer:  a. the number of protons

Explanation:

Atomic number is defined as the number of protons or number of electrons that are present in an electrically neutral atom.

Atomic number = Number of electrons = Number of protons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

In an atom, when electrons are lost, the atom gains a positive charge and forms cation. In an atom, when electrons are gained, the atom occupies a negative charge and forms anion.

Hence, neutrons and protons affects the mass number and electrons affects the charge on an atom. The atomic number of an element is determined by the number of protons.

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A compound is formed by the reaction between magnesium and bromine. What is the chemical formula for this compound?
saul85 [17]

Answer:

Magnesium Bromide

Explanation:

MgBr₂

3 0
3 years ago
A sample of benzene was vaporized at 25◦C. When 37.5 kJ of heat was supplied, 95.0 g of the liquid benzene vaporized. What is th
grandymaker [24]

Answer:

Enthalpy of vaporization = 30.8 kj/mol

Explanation:

Given data:

Mass of benzene = 95.0 g

Heat evolved = 37.5 KJ

Enthalpy of vaporization = ?

Solution:

Molar mass of benzene = 78 g/mol

Number of moles = mass/ molar mass

Number of moles = 95 g/ 78 g/mol

Number of moles = 1.218 mol

Enthalpy of vaporization =  37.5 KJ/1.218 mol

Enthalpy of vaporization = 30.8 kj/mol

8 0
3 years ago
Explain the reaction of metals with water.<br><br>​
telo118 [61]

Answer:

it rusts

Explanation:

4 0
3 years ago
How many liters of 0.1107 M KCI contain 15.00 g of KCI (FW 74.6 g/mol)? O0.02227 L O 0.5502 L 01661 L O 1.816 L 18.16 L
Greeley [361]

Answer:

1,816 L

Explanation:

Molar concentration or molarity is a way to express the concentration of a chemical in terms of moles of substances per liter of solution.

To obtain the liters of this solution you must convert moles/L to g/L with formula weight (FW), thus:

0,1107 mol of KCl / L × (74,6 g / mol) = 8,258 g of KCl / L.

It means that in one liter you have 8,258 g of KCl. Thus, 15,00 g of KCl are contained in:

15,00 g × (1 L / 8,258 g) = 1,816 L

I hope it helps!

3 0
3 years ago
Which statement accurately describes the reactants of a reaction?
krek1111 [17]

Answer:

C. substances that are used up in a reaction

Explanation:

Substances are combined in a chemical reaction to give rise to other substances. The substances that come together are called REACTANTS while the substances that are produced are called PRODUCTS.

Reactants are used up in the reaction to give rise to new products at the end of the reaction. For example, in the reaction as follows:

6CO2 + 6H2O --> C6H12O6 + 6O2

CO2 (carbon dioxide) and water (H2O) are the REACTANTS of the reaction, which are used up to form glucose and oxygen (products)

6 0
2 years ago
Read 2 more answers
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