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EastWind [94]
3 years ago
7

All physical changes can be identified at the macroscopic level. true or false

Chemistry
1 answer:
Aliun [14]3 years ago
5 0

Answer:

True

Explanation:

The physical changes are reversible in most cases and these changes are not the chemical changes which means that it is only the change in its state not in their nature. Just take the example of water, on cooling it becomes solid and change in color can be seen which is white in solid form and colorless in liquid form. This is also reversible and is a physical change. This means that physical changes can be identified at macroscopic level. Hence the answer is true.

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Which of the following descriptions properly describes the electrons?
gladu [14]

Answer:

Which following? If you could please be more specific I would gladely love to answer your question. (:

5 0
4 years ago
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A quality of gas under a pressure of 600.0mm Hg has a volume of 39.7 liters. What is it’s volume at standard pressure when the t
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Answer:  it would be 23820 liters i dont know thats my best answer, hope it helps!

Explanation:

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3 0
3 years ago
URGENT!!!
miv72 [106K]
<h3>Answer;</h3>

= 13.629 g of ZnCl2

<h3><u>Explanation;</u></h3>

The equation for the reaction.

Zn(s)+2HCL(aq)=>ZnCl2(aq)+H2(g)

Number of moles of Zinc;

Moles = mass/RAM

          = 6.5 g/65g/mol

          = 0.1 moles

The mole ration of Zn : ZnCl2 is 1 : 1

Therefore, number of moles of ZnCl2 is 0.1 moles

Mass = moles × Molar mass

         = 0.1 ×136.286 g/mol

        <u> = 13.629 g</u>

7 0
3 years ago
Can u help?? It's science and I'm in 6th grade
matrenka [14]
Yes I can help you in science
7 0
3 years ago
A race car is driven by a professional driver at 99 . What is this speed in and ? 1 mile = 1.61 kilometers 1 hour = 60 minutes E
slavikrds [6]

Answer: The speed is equivalent to <u>159.39 kilometers per hour </u>or <u>2.65 kilometers per minute.</u>

Explanation:

Given, The speed of a race car = 99 miles/ hour

To convert the speed into  kilometers per hour and kilometers per minute

Since   1 mile = 1.61 kilometers

So, Speed of car = (99 ) x (1.61 )

= 159.39 kilometers per hour.

Also, 1 hour = 60 minutes

Then, Speed of car = (159.39) ÷60

= 2.6565≈2.65 kilometer per minute.

Hence, the speed is equivalent to <u>159.39 kilometers per hour </u>or <u>2.65 kilometers per minute.</u>

4 0
4 years ago
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