4 years ago

Which of the changes are chemical changes?

1 answer:

7 0

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.

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consider a 1000-ml graduated cylinder with marks every 100 ml. a student records the volume of liquid in the cylinder as 750 ml.

kap26 [50]

Answer:

Yes, given statement is true.

Explanation:

Given that a cylinder of 1000 ml is marked at every 100 ml.

During the test, the student can easily check the volume of liquid so the student's guess is 750 ml true.

With this measurement, we can estimate that 1/10th of 100 ml can be measured.

So, given statement is correct.

6 0

3 years ago

The substance that does the dissolving in the mixture solution<br> is called the

const2013 [10]

Answer: Solute

Explanation:

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4 years ago

Which of the following substances can be used to neutralize HF?

Artemon [7]

Answer:

option (D) NaOH is right answer

4 0

3 years ago

1. How much heat is required to vaporize 25 g of water at 100˚C?

Vsevolod [243]

The amount of heat required to change 25 grams of water into steam is 56425 joules or 13500 calories.

7 0

3 years ago

How many milliliters of a 1M nitric acid solution are required to prepare 60mL of 6.7M solution?

Free_Kalibri [48]

Answer:

the number of milliliters of a 1M is 402mL

Explanation:

The computation of the number of milliliters could be determined by using the following formula

As we know that

$V_1\times M_1 = V_2\times M_2$

where,

V_1 and V_2 are the starting and final volumes

And, the M_1 and M_2 are the starting and the final molarities

Now the V_1 is

$V_1 \times 1M = 60mL \times 6.7M$

So, the V_1 is 402mL

Hence, the number of milliliters of a 1M is 402mL

4 0

3 years ago