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Eddi Din [679]
3 years ago
6

If gold gets hot enough it will melt, what type of change is this?

Chemistry
2 answers:
SashulF [63]3 years ago
8 0
A.
Physical change
Step by step explanation;:)
Lynna [10]3 years ago
6 0

Answer:

A) Physical

Explanation:

Melting is a physical change, not a chemical change.

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What is the charge on an atom after it loses an electron during the formation of a bond?
NARA [144]

Answer:

One positive charge

Explanation:

In a neutral atom, the number of positive and negative particles are equal. This leaves the atom with a net charge of zero, 0.

When the number of protons in an atom is greater than the number of electrons, the atom becomes positively charged. When an atom loses an electron when a bond wants to form, it has a net positive charge.

The number of electrons lost or gained determines the charge.

7 0
3 years ago
What does the law of conversation of matter show?
Zarrin [17]
The Law of Conservation of Matter states that matter cannot be created or destroyed. In a physical change, substances can change form, but the total mass remains the same.
5 0
3 years ago
How many molecules are present in 187 grams of XeF4
PtichkaEL [24]

There are 5.43 x 10²³ present in  187 grams of XeF₄

<h3>Further explanation  </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

\tt n(mol)=\dfrac{mass(m)}{MW}

mass of XeF₄ = 187 g

mol XeF₄ (MW=207,2836 g/mol) :

\tt mol=\dfrac{187}{207,2836 g/mol}=0.902

Number of molecules :

\tt N=0.902\times 6.02\times 10^{23}\\\\N=5.43\times 10^{23}

4 0
3 years ago
8) If one mole of carbon contains x atoms then number of atoms in 12g of Mg are
Roman55 [17]
0.5 mole of Mg=12 grams= 0.5x atoms
5 0
3 years ago
What are the final or new substances (molecule) in a chemical equation called?
PilotLPTM [1.2K]
Final or new substances in a chemical equation will be called PRODUCT!. hence the substances itself are reactants. hope it helps a bit.
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3 years ago
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