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Marta_Voda [28]
2 years ago
14

I am a teacher in a college in a large city in China. One day, some students asked me to join

Chemistry
1 answer:
IrinaVladis [17]2 years ago
8 0

Answer:

c or b

Explanation:

the story is entertaining and it shares the teachers personal experiences with the teachers students

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Why does earth look blue from space
Julli [10]

Answer:

Earth is the only planet in our solar system that has a large amount of liquid water. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet. Because of its water, Earth is home to millions of species of plants and animals.

Explanation:

Earth is the only planet in our solar system that has a massive quantity of liquid water. About 74% of the surface of Earth is covered with the aid of liquid or frozen water. Because of this, people on occasion name it the blue planet. Because of its water, Earth is domestic to thousands and thousands of species of flora and animals.

8 0
3 years ago
What compound is always produced when an acid and a base are combined?
denis-greek [22]
Salt and water are formed

H₃PO₄ + 3KOH = K₃PO₄ + 3H₂O
CH₃COOH + NaOH = CH₃COONa + H₂O
5 0
3 years ago
A certain liquid has a density of 0.70g/m. Find the mass of 6.4L o this liquid
neonofarm [45]

The mass of the liquid is 4.8 kg.

6.4 L = 6400 mL

Mass = 6400 mL × (0.70 g/1 mL) = 4500 g = 4.8 kg

5 0
3 years ago
Equilibrium systems___
Maksim231197 [3]

Answer:

This is when the concentration in a solution have both the reactants and products equal.

Explanation:

An equilibrium This is when the concentration in a solution have both the reactants and products equal. It ca also be said that,  equilibrium is when both the forward and reverse reactions occur at equal rates.

3 0
3 years ago
A metal crystallizes in a body-centered cubic unit cell. The radius of one atom = 2.30 x 10 -8 cm. The density of the metal is 0
maw [93]

Answer:

25.41 g/mol is molar mass of metal.

Explanation:

Number of atom in BCC unit cell = Z = 2

Density of metal = 0.867 g/cm^3

Edge length of cubic unit cell= a = ?

Radius  of the atom of metal = r = 2.30\times 10^{-8} cm

a=2\times r=2\times 2.30\times 10^{-8} cm=4.60\times 10^{-8} cm

Atomic mass of metal =M

Formula used :  

\rho=\frac{Z\times M}{N_{A}\times a^{3}}

where,

\rho = density

Z = number of atom in unit cell

M = atomic mass

(N_{A}) = Avogadro's number  

a = edge length of unit cell

On substituting all the given values , we will get the value of 'a'.

0.867 g/cm^3=\frac{2\times M}{6.022\times 10^{23} mol^{-1}\times (4.60\times 10^{-8} cm)^{3}}

M = 25.41 g/mol

25.41 g/mol is molar mass of metal.

6 0
3 years ago
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