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NeX [460]
3 years ago
12

How many significant figures does 0.040040 have ?

Chemistry
1 answer:
Georgia [21]3 years ago
5 0

Answer: 2 is the answer

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Why does Hess's law allow you to determine the enthalpy change of a<br> reaction?
lana [24]

Enthalpy is a state function

Explanation:

The Hess's law allows us to determine the enthalpy change of a reaction because enthalpy is a state function. It does not depend on the individual path take in going from reactants to products in the reaction.

  • Enthalpy changes are the heat changes accompanying physical and chemical changes.
  • It is the difference between the heat content of product in the final state and the reactants.
  • Enthalpy changes for some reactions are not easily measurable experimentally.
  • To calculate such heat changes, we apply the Hess's law of heat summation.
  • The law states that "the heat change of a reaction is the same whether it occurs in a step or several steps".
  • The Hess's law is simply based on the first law of thermodynamics by which we know that energy is conserved in every system.

learn more:

Hess's law brainly.com/question/11293201

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3 years ago
Give three reasons why fluid spills in water are more damaging than fluid spills on land
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1) Oil is less dense than water so when oil spills, it spreads across the entire water surface.

2) The oil spreads very quickly with lighter oils such as gasoline.

3) Wind, Currents, and Warm Temperatures will cause Oil to spread quicker.

7 0
2 years ago
Is PO4^-3 polar, non-polar, or ionic?
Gala2k [10]
The answer is PO4^-3 is non-polar.
8 0
3 years ago
Is Pb(NO3)2 soluble or insoluble?
Sedaia [141]

Answer: it is soluble

Explanation: nitrates are soluble.

4 0
3 years ago
I WILL GIVE U BRAINLIEST
PtichkaEL [24]

Answer:

guidelines

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It gives perameters for her abilities :)

7 0
2 years ago
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