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2 years ago

Evaluate each scenario to determine whether it represents a chemical reaction.

Chemistry

2 answers:

vova2212 [387]2 years ago

8 0

Explanation:

A chemical reaction is one in which a chemical change occurs.

During a chemical change;

The process is irreversible
New kinds of matter produced
There is a change in mass

Based on these premise;

Baking cake batter is a chemical reaction because you cannot reverse the process

Shredding a paper is not a chemical reaction because no new kind of matter is produced.

Twisting of a metal wire is not a chemical reaction

Yellowing of newspaper in sunlight is a chemical change. The process cannot be reversed

Arada [10]2 years ago

3 0

Answer:

1. yes 2. no 3.no 4.yes

Explanation:

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3 years ago

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fiasKO [112]

Answer: The empirical formula is $CH_2$ .

Explanation:

Mass of C = 1.71 g

Mass of H = 0.287 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{1.71g}{12g/mole}=0.142moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.287g}{1g/mole}=0.287moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{0.142}{0.142}=1$

For H = $\frac{0.287}{0.142}=2$

The ratio of C: H = 1: 2

Hence the empirical formula is $CH_2$ .

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