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abruzzese [7]
3 years ago
5

Hannah does an experiment she has two colorless chemicals that she mixes together in a beaker which of the following indicates t

hat a chemical change occurs when she mixes the two chemicals together
Chemistry
1 answer:
mrs_skeptik [129]3 years ago
8 0

1.the chemical change color from colorless to purple

2. A yellow gas forms

3.a brown solid forms in the bottom of the beaker

4.the temperature of the chemicals rises 15 Celsius

Explanation:

All of the options are proofs that chemical change has occurred.

A chemical change is one with the following properties:

  • A new kind of matter is usually formed as seen by the gas evolution and the formation of the insoluble precipitate i.e brown solid at the bottom of the beaker.
  • They are not easily reversible.
  • Usually accompanied by energy changes as seen in the rise in temperature.
  • Color changes can also infer chemical changes in a reaction.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

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A compound was decomposed and determined to be 51.27 % C, 7.75 % H and 40.98 % O by mass. What is the subscript for H in the emp
Vlad [161]

The subscript for H in the empirical formula for this compound is 3.

There are 3 steps involved in the construction of empirical formula.

Calculation of empirical formula is as under as ...

Step 1: Divide the % of each atoms which their atomic weights.

 C = 51.27 / 12 = 4.27

 H = 7.75 / 1 = 7.75

 O = 40.98 / 16 =2.56

Step 2 : Divide all the answers with the smallest answer to get the subscripts for empirical formula.

C = 4.27/ 2.56 ≈ 2

H = 7.75/ 2.56 ≈ 3

O = 2.56 /2.56 = 1

Step 3: Construction of empirical formula by putting subscripts calculated in step 2.

Empirical formula form given data = C_{2} H_{3} O_{1}

Thus , subscript for H in the empirical formula for this compound is 3.

Learn more about empirical formula here..

brainly.com/question/13058832

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