All categories

3 years ago

Which process is a chemical change?

Chemistry

2 answers:

grandymaker [24]3 years ago

6 0

Answer:

Burning a match... i'm pretty sure.

Explanation:

All the other are phisical changes while Fire is a chemical reaction.

laila [671]3 years ago

6 0

Answer:

Burning a match is a chemical change.

Explanation:

Burning is defined as the rapid oxidation of a combustible material.

Complete oxidation of the match stick results in an entirely different compound (the ash) while electrons are lost by the wood of the match.

You might be interested in

A water treatment tablet contains 20.0 mg of tetraglycine hydroperiodide, 40.0% of which is available as soluble iodine. If two

Galina-37 [17]

Answer:

$16\ \text{ppm}$

Explanation:

Mass of one tablet = 20 mg

Mass of two tablets = $2\times 20=40\ \text{mg}$

Percent that is soluble in water = 40%

Mass of tablet that is soluble in water = $0.4\times 40=16\ \text{mg}$

So, mass of solute is $16\ \text{mg}$

Density of water = 1 kg/L

Volume of water = 1 L

So, mass of 1 L of water is $1\times 1=1\ \text{kg}=1000\ \text{g}$

PPM is given by

$\dfrac{\text{Mass of solute}}{\text{Mass of solvent}}\times 10^6=\dfrac{16\times 10^{-3}}{1000}\times 10^6\\ =16\ \text{ppm}$

Hence, the concentration of iodine in the treated water $16\ \text{ppm}$ .

8 0

3 years ago

How does gravity affect the moon?

Shalnov [3]

A, The moon pulls on the earth making the tides rise and fall

8 0

3 years ago

Read 2 more answers

How many molecules are in 1.95 moles of water?

OLEGan [10]

Water has a molar mass of 18.015 g/mol . This means that one mole of water molecules has a mass of 18.015 g . So, to sum this up, 6.022⋅1023 molecules<span> of water will amount to 1 mole of water, which in turn will have a mass of 18.015 g . 2.7144moles H2O ⋅</span>6.022<span>⋅1023molec.1mole H2O =1.635⋅1024molec.</span>

3 0

3 years ago

Read 2 more answers

What have all living things evolved from?

dedylja [7]

Earlier species thanks to evolution. hope this helped!

3 0

3 years ago

Read 2 more answers

UGRENT! Please help showing all work

Bess [88]

Answer: