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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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The hydrogen ion concentration is 1 × 10-7. What is the ph of this solution?
Naya [18.7K]

Answer:

  • <em>The pH of the solution is </em><u><em>7</em></u>

Explanation:

<em>The pH</em> is a measure of the acidity of the solutions. It is defined as the negative logarithm of the molar concentration of hydrogen ions (H⁺).

  • pH = - log [H⁺]

<em>The hydrogen ion concentration of this solution is 1 × 10⁻⁷ M.</em>

Hence:

  • pH = - log (1 × 10⁻⁷) = - (-7) = 7

This pH corresponds to a neutral solution (neither acid nor alkaline).

You should remember this relation bwtween pH and acidity/alkaliinity:

  • Low pH (0.0 or close) corresponds to strong acids
  • HIgh pH (14.0 or close) corresponds to strong bases
  • Acids have pH between 0.0 and 7.0
  • Bases have pH between 7.0 and 14.0
6 0
3 years ago
5. Hurricane winds are strongest and rain is heaviest in the part of a hurricane called the<br>​
Igoryamba

Answer:

In the center is the eye, with nearly clear skies, surrounded by the violent eyewall, with the strongest winds and very heavy rain.

Explanation:

3 0
3 years ago
Read 2 more answers
In a car engine gasoline is burning to create mechanical energy which of the following statements is true? A. Some energy is los
Anvisha [2.4K]

Answer:

Some energy is lost as heat

Explanation:

It is correct to say that as the gasoline is converted to mechanical energy in the automobile engine, some of the energy is lost as heat.

Heat energy is on of the ways energy is lost in any system. The movement of mechanical parts and even the combustion of the gasoline produces heat energy.

These energy are usually lost to the environment.

4 0
3 years ago
Which of these actions would increase heat transfer between two objects?
klasskru [66]

Heat transfer is the phenomenon that occurs when the two objects are in the vicinity of each other and by increasing the area of their contact. Thus, option B is correct.

<h3>What is heat transfer?</h3>

Heat transfer is a process that flows the heat from one system to another, and is because of the difference in the temperature of the two objects that are part of the system.

The methods like conduction, convection, and radiation transfer the heat from the surface area to the other object. The heat gets transferred from the area of high to the low temperature.

Therefore, option B. by increasing the surface area the heat transfer increases.

Learn more about heat transfer here:

brainly.com/question/17823456

#SPJ1

5 0
2 years ago
85% of what number is 17? EXPLAIN
vitfil [10]

Answer:

85% of 20 is 17

Explanation:

You can multiply 85% and 20 or subtract 85% from 20.

5 0
3 years ago
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