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Ulleksa [173]
3 years ago
9

What are the four ways to tell if a chemical change has occurred?

Chemistry
1 answer:
Greeley [361]3 years ago
7 0

Answer:

Four ways to tell if a chemical change has occurred is if:

   Production of Gas (Bubble Formation)

   Change in Odor

   Change in Color

   Temperature Change (Is it hotter or colder?)

Explanation:

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Which of the following describes the greenhouse effect?
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D

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How is technology useful and how is it harmful
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8 0
3 years ago
What halide would undergo dehydrohalogenation to give 2-pentene as a pure product?
statuscvo [17]
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4 0
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Read 2 more answers
The rate constant k for a certain reaction is measured at two different temperatures:
bogdanovich [222]

Answer:

Ea=5.5 Kcal/mole

Explanation:

Let rate constant are K_1  and K_2  at temperature T_1  and T_2

By using Arrhenius equation at two different two different temperature,

Log K_1/K_2 =E_a/2.303R*(1/T_2 -1/T_2 );T_1=273+376=649K  ;K_1=4.8*10^8;T_2=273+280=553K  ;K_2=2.3*10^8;R=2 cal/(mole.K);Log (4.8*10^8)/(2.3*10^8 )=E_a/2.303R*(1/553K-1/649); Log 4.8/2.3=E_a/2.303R*96/358897 ;0.32=E_a/2.303R*96/358897;E_a=(0.32*2.303R*358897)/96;  

By putting value of R=2 cal/mole.K

E_a=5510.265cal/mole;

By rounding off upto 2 significant figure;

E_a=5.5Kcal/mole;

8 0
3 years ago
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