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3 years ago

How can scientists control the flammability of a substance?

Chemistry

1 answer:

mamaluj [8]3 years ago

8 0

Answer: This is simple, if it has a high flammability, and you light it on fire, then that would be a chemical change.

Explanation:

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Matches=from Chemical energy to light energy+heat energy

solong [7]

Explanation:

A matchstick has a lot of chemical energy stored in it. When the match is struck, it burns and the chemical energy in it produces heat energy and light energy.

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7 0

2 years ago

How many atoms of Na are in 1.89 mol of Na?

atroni [7]

Answer:

1.138158E24 atoms or 1.14 x 10^24 atoms

Explanation:

To find atoms/particles from moles you just want to convert using avogadro's number which is 6.022 x 10^23

1.89 mol x 6.022 • 10^23

———— = 1.138158E24 atoms

1 mol

so 1.138158E24 atoms or 1.14 x 10^24 for scientific notation

hope this helps :)

5 0

2 years ago

1.) A solute is separated from its solvent my evaporation. What kind of process is this?

RideAnS [48]

1) C !! Physical Process

2) A

3) D !! Water is universal solvent !

if you need any explanation ; comment !!

8 0

3 years ago

Explain viscosity Pls help ty

Fantom [35]

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water.

3 0

2 years ago

Read 2 more answers

What is the solution to the problem rounded to the correct number of significant figures? 8.01 × 4.1 = ? A. 32.8 B. 32.84 C. 32.

kicyunya [14]

Answer: The correct option is Option D.

Explanation:

Significant figures are defined as the figures that represent the digits of a number which carry an important contribution to the numerical value, starting with the first non-zero digit. For Example: 105.268 has 6 significant figures because every digit carry its own contribution towards the numerical value.

Whenever there is multiplication, the answer will contain the same number of significant figures as there are in the least precise numerical value.

Significant figures in 8.01 are 3 and that in 4.1 are 2.

So, the answer of these two numerical value will contain 2 significant figures.

$8.01\times 4.1=32.841\approx 33$

Hence, the correct option is Option D.

7 0

3 years ago

Read 2 more answers