2 years ago

What rock has a hardness of 4,and has a dull luster. What is it?

Chemistry

1 answer:

gogolik [260]2 years ago

5 0

Answer:

Fluorite

Explanation:

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9. Which indicator would show a pH change from 6 to 7?

expeople1 [14]

Answer:

Explanation:

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2 years ago

What launched the era of modern science in the 17th century?

ANEK [815]

Answer:

Galileo Galilei

What launched the era of modern science in the 17th century? Modern science began in the 17th century, when the Italian physicist Galileo Galilei revived the Copernican view.

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Explanation:

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3 years ago

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Given the reaction _K(s) +_ Cl2(g) → _KCl(s) what is the amount of K, in grams, needed to completely react with 2 moles of Cl2(g

damaskus [11]

Answer:

156.4g K

Explanation:

I'm not sure if it is correct but I think it should be this

What do we know so far?: 2K + 1Cl2 -> 2KCl, 2 mol of Cl2

What are we looking for?: #g of K

What is the ratio of K to Cl2?: 2:1

Set up equation: 2molCl2 x $\frac{2mol K}{1 mol Cl2}$

Cancel unwanted units: 2 x $\frac{2mol K}{1}$

Answer we got: 2 x 2mol K = 4mol K

Converting moles to grams: 4 x 39.1 (molar mass of K) = 156.4g K

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2 years ago

What is the definition of specific heat? O A. The heat required to break the molecular bonds within a substance B. The total amo

snow_tiger [21]

Answer:

Explanation:

C . specific heat = J / gm-C

7 0

2 years ago

A boy weighing 25 kg sits in a 1000 kg car at a speed of 15 m/s. What is the total momentum of the car and the boy?

dexar [7]

Answer:

D) 15375kgm/s

Explanation:

weight of the boy 25kg +weight of the car 1000kg= 1025kg so momentum =mass × velocity. so it's SI unit is = kg×m/s = kg m/s.

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2 years ago