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3 years ago

SCIENCE

Chemistry

2 answers:

grigory [225]3 years ago

6 0

The gravitational pull between the gas and dust matter leads to the formation of new galaxies

GalinKa [24]3 years ago

3 0

Answer:

The gravitational pull between the gas and dust matter leads to the formation of new galaxies

Explanation:

My teacher went over the answers and said that one was correct.

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What is the lon # for Beryllium (Be)?

QveST [7]

Answer:

Number: 4

Charge: +2

Element: Beryllium

I hope this helps!! :)

3 0

3 years ago

HCI+CaCO3=CaCl2+H2O+CO2<br>

Nookie1986 [14]

Answer:

2 HCl + CaCO3 = CaCl2 + H2O + CO2

Explanation:

On the right side we have 2xCl, to get the same amount we will multiply HCl on the left side by 2.

This will give us 2xH on the left side; we also have 2xH on the right side ( in H2O).

On both sides we have 1x Ca; 1x C.

On the left side we have 3XO (in CaCO3), on the right side we have 1O in H20 and 2xO in CO2, so 3x O on the right side as well.

The reaction is balanced.

5 0

3 years ago

Which of the following blackbody curves is representative of stars like our Sun?

Xelga [282]

Answer:

its letter b

Explanation:

it represents the spectrum of stars

3 0

3 years ago

Some compounds are better known by their common names than by their systematic chemical names. Give the chemical formulas of the

kondaur [170]

Explanation:

(a) Dry ice is solid carbon dioxide and its chemical formula is solid $CO_{2}$ .

(b) Sodium chloride is commonly known as salt in daily life. Hence, chemical formula of salt is NaCl.

(c) Laughing gas is also known as dinitrogen monoxide. Hence, its chemical formula is $N_{2}O$ .

(d) Marble (chalk limestone) is chemically known as calcium carbonate. Hence, its chemical formula is $CaCO_{3}$ .

(e) Baking soda is chemically known as sodium bicarbonate. Hence, its chemical formula is $NaHCO_{3}$ .

(f) Ammonia has a chemical formula as $NH_{3}$ .

(g) Water has a chemical formula as $H_{2}O$ .

(h) Milk of magnesia is a base and it is chemically known as magnesium hydroxide. Its chemical formula is $Mg(OH)_{2}$ .

(i) Epsom salt is most often found as heptahydrate of sulfate mineral epsomite. Its chemical formula is usually $MgSO_{4}.7H_{2}O$ . If not present as a heptahydrate then its chemical formula is $MgSO_{4}.(H_{2}O)_{x}$ where, value of x can be equal to 0 to 7.

5 0

3 years ago

Plz help with those questions :D

OverLord2011 [107]

A and B should be correct

8 0

3 years ago

*SCIENCE*

SCIENCE