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DochEvi [55]
3 years ago
7

Is it correct to say that only one observable change accompanies a chemical change?

Chemistry
1 answer:
eimsori [14]3 years ago
5 0

Answer:

it is not correct to say that one observable change accompanies a chemical change because if a substance change its shape or size it doesn't mean that it has undergone a chemical change.

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Describe the relationship between"q" and energy in the melting of an ice cube.
klio [65]

Answer:

Now "q" is  the heat and energy is the capacity of any object or body ton perform any work. So we can relate them if we take the term specific heat in consideration.

As specific heat is the the amount of heat required to raise the temperature of an object in specific from one degree Celsius, for ice it is 2.108 kJ/kgK.

Explanation:

  • c = specific heat capacity,

  • q = heat

  • ΔT = change in temperature

So, we have:

  • C= Q/ΔT
  • It is the ratio of the amount of heat energy transferred to an object to the resulting increase in temperature of the object.

4 0
4 years ago
How do you do double replacement reactions?
Harman [31]
You have to switch the elements based in if they're metals/nonmetals. so nonmetals switch with each other and metals switch with each other.

AB + CD ---> AC + BD
5 0
3 years ago
Which of the following would be most useful in trying to obtain procedural information to replicate an experiment previously pub
Jet001 [13]

Answer: Peer-reviewed journal article is the most useful because the information in them had been carefully scrutinized and aproved by people who are experts in that particular field.

7 0
3 years ago
What is the Ka of a 0.0796 M solution of nitrous acid (HNO2) with a pH of 2.95?
Vadim26 [7]

Answer:

Coefficient = 1.58

Exponent = - 5

Explanation:

pH = 2.95

Molar concentration = 0.0796M

Ka = [H+]^2 / [HA]

Ka = [H+]^2 / 0.0796

Therefore ;

[H+] = 10^-2.95

[H+] = 0.0011220 = 1.122 × 10^-3

Ka = [H+] / molar concentration

Ka = [1.122 × 10^-3]^2 / 0.0796

Ka = (1.258884 × 10^-6) / 0.0796

Ka = 15.815 × 10^-6

Ka = 1.58 × 10^-5

Coefficient = 1.58

Exponent = - 5

4 0
4 years ago
• What is produced at the end of the cell cycle? How do they compare to each other and
olga2289 [7]

Answer:

At the end of cell cycle (mitosis replication), two daughter cells are produced. Each contains exactly the same number of DNA content.

6 0
3 years ago
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