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lesya [120]
3 years ago
12

Choose all the answers that apply.

Chemistry
2 answers:
Lady_Fox [76]3 years ago
7 0
It is softer than topaz and and it is softer than diamond (diamond has a Mohs hardness of 10, which is the highest value of the scale)
Feliz [49]3 years ago
4 0

Answer: The unknown mineral is softer than topaz and diamond both.

Explanation:

Mohs scale is scale used to measure the hardness of the minerals. the value of the scale is from 0 to 10. The mineral with higher value on scale will be able to scratch easily the mineral with lower value on the scale.

As according to the question,Topaz has Mohs hardness of 8 and was able to scratch the unknown mineral which implies that the unknown mineral is softer than the Topaz .And Topaz is softer than Diamond which means that unknown mineral is also softer than diamond.

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3 years ago
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What is the mass of 2.50 moles of potassium chlorate in grams
Sedaia [141]

Answer: 306 grams are there in 2.50 moles of potassium chlorate

Explanation

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

given mass of potassium chlorate = ?

Molar mass of potassium chlorate = 122.55 g/mol

Putting in the values we get:

2.50=\frac{xg}{122.55g/mol}

x=2.50mol\times 122.55g/mol=306g

306 grams are there in 2.50 moles of potassium chlorate

3 0
3 years ago
Una muestra de 1 gramo de un elemento contiene 1,5 x 1022 atomos, cual es su masa molar❓❓
marusya05 [52]

El número de Avogadro es 6,022 x 10^23, y es el número de átomos que hay en un mol de dicho elemento. A su vez un mol es la cantidad de un elemento cuya masa en gramos coincide con el peso atómico.

Por tanto, 6,022 x 10^23 átomos del elemento tienen una masa en gramos igual a su peso atómico. Hacemos una regla de tres:


1 gramo -------- 1,5 x 10^22 átomos

x ------------------ 6,022 x 10^23 átomos


=> x = 40,1 gramos por mol del elemento.


De modo que su peso atómico es 40,1. Se trata del calcio.


Saludos.

7 0
3 years ago
What is an animal that eats producers called?​
SCORPION-xisa [38]

Answer:

A consumer

Explanation:

8 0
3 years ago
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How much heat must be transferred to 55 g of ice to change the ice's temperature from -13°C to -5.0°C? (The specific heat capaci
notka56 [123]

Answer:

Hey i don't know if you still need the answer but this is what i think it is:

Explanation:

B is correct answer

15 j

(Sorry if its wrong)

8 0
3 years ago
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