CHEMISTRY MIDDLE SCHOOL

In a college there are exactly 3000 students, exactly 60% are male. What is the number of female students

Answers

Answer 1
Answer:

Answer:

1800

Explanation:

3000x.60=1800

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Can someone help , I don’t understand how to do this

Answers

Answer:

Sometimes reading it again will help. Sometimes it really is that simple. The information doesn’t all find its way

Ask questions. I will always do my best to explain things to students, but it helps if I know when they haven’t

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Explanation:

Why is a piece of apple rotting a chemical change

Answers

Because the glucose (and other useful substances) are no longer there after the rotting (the substance itself changes, rather than simply changing some state of the same substance)
Because you can't change it back to the way it was before it rotted.

What is the volume of solution (in mL) produced when 91.80g of Mg(OH)2 are usedto produce a 0.7M solution? Record your answer to 1 decimal places.

Answers

Answer:  The volume of solution is 2248 ml

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=(n* 1000)/(V_s)

where,

n = moles of solute

V_s = volume of solution in ml

moles of Mg(OH)_2 = \frac{\text {given mass}}{\text {Molar mass}}=(91.80g)/(58.32g/mol)=1.574mol

Now put all the given values in the formula of molality, we get

0.7=(1.574* 1000)/(V_s)

V_s=(1.574* 1000)/(0.7)=2248ml

Therefore, the volume of solution is 2248 ml

What changes igneous or sedimentary rock into metamorphic rock?

Answers

Answer:

The answer is Temperature (Heat), Pressure and chemical activity of fluids.

Explanation:

Metamorphic rocks result from the transformation of pre-existing rocks that have undergone structural and mineralogical changes under certain physical or chemical conditions such as temperature, pressure or chemical activity of the fluids. This type of modification is known as a process called metamorphism, in which igneous rocks or sedimentary rocks, when subjected to high temperatures, pressures or active fluids, cause changes in their composition, bringing new substances to them.
Heat, pressure, or transfer of elements

A student walks for 2.0 hours and travels 5.0km. What is the average speed of the student?

Answers

2.5KM/H
BECAUSE 5 DIVIDED BY 2 IS 2.5

A mass of 9.2 kg is accelerated at 2.1 m/s^{2}. what is the force?

Answers

Answer:

The force is 19.3N

Explanation:

F = m × a

= 9.2 × 2.1

= 19.3N (3sf)
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