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3 years ago

Choose all the answers that apply.

2 answers:

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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How many elements in alka seltzer

Hatshy [7]

Explanation:

<h2>QUESTION:</h2>

How many elements in alka seltzer

<h2>ANSWER:</h2>

 Alka-Seltzer contains three elments ingredients: aspirin (acetylsalicylic acid) (ASA), sodium bicarbonate, and anhydrous citric acid.

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6 0

2 years ago

When the temperature of a gas changes, it's volume decreases from 12 cm3 to 7 cm3 if the final temperature is measured to be 18°

ElenaW [278]

Answer:

The initial temperature is 499 K

Explanation:

Step 1: Data given

initial volume = 12 cm3 = 12 mL

Final volume = 7 cm3 = 7mL

The final temperature = 18 °C = 291 K

Step 2: Calculate the initial temperature

V1/T1 = V2/T2

⇒with V1 = the initial volume = 0.012 L

⇒with T1 = the initial volume = ?

⇒with V2 = the final volume 0.007 L

⇒with T2 = The final temperature = 291 K

0.012 / T1 = 0.007 / 291

0.012/T1 = 2.4055*10^-5

T1 = 0.012/2.4055*10^-5

T1 = 499 K

The initial temperature is 499 K

8 0

3 years ago

Hi! help me please. CALCULATE THE NUMBER OF MOLECULES FOUND IN 8 MOL OF WATER?

kvasek [131]

Answer:

so the number of molecules in 8 moles of water is 4.8176×10^24

Explanation:

number of moles=8moles

avogadro's number=6.022×10²³

number of molecules=?

as we know that

$number of moles=\frac{number of molecules}{avogadro's number}$

substituting the equation

number of moles × avogdro's number=number of molecules

number of molecules=8moles×6.022×10²³

number of molecules=4.8176×10^24

i hope this will help you :)

4 0

3 years ago

Which of the following actions will not increase the rate at which a solid dissolves in

aliya0001 [1]

Answer:

O lowering the temperature of the system

5 0

3 years ago

The outside boundary of an animal cell

Wewaii [24]

Plasma membrane is the answer

6 0

3 years ago