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VikaD [51]
3 years ago
11

Which atmospheric gas protects living things on Earth from gamma rays

Chemistry
2 answers:
Kamila [148]3 years ago
8 0
I think the answer is B.
I hope this helps u.(And I hope it's correct)!!!!!!!!!!!
slega [8]3 years ago
4 0
I think the answer is  B . I really hope that this helps you out.
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What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare
Schach [20]

<span> </span>

Answer is: volume is 20 mL.<span>
c</span>₁(CH₃COOH) = 2,5 M.<span>
c</span>₂(CH₃COOH) = 0,5 M.<span>
V</span>₂(CH₃COOH) = 100 mL.<span>
V</span>₁(CH₃COOH) = ?<span>
c</span>₁(CH₃COOH) · V₁(CH₃COOH) = c₂(CH₃COOH) · V₂(CH₃COOH).<span>
2,5 M · V</span>₁(CH₃COOH) = 0,5 M · 100 mL.<span>
V</span>₁(CH₃COOH) = 0,5 M · 100 mL ÷ 2,5 M.<span>
V</span>₁(CH₃COOH) = 20 mL ÷ 1000 mL/L =0,02 L.

8 0
3 years ago
Please help!!
antiseptic1488 [7]

Answer:

Explanation:

Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena.[1] The term law has diverse usage in many cases (approximate, accurate, broad, or narrow) across all fields of natural science (physics, chemistry, astronomy, geoscience, biology). Laws are developed from data and can be further developed through mathematics; in all cases they are directly or indirectly based on empirical evidence. It is generally understood that they implicitly reflect, though they do not explicitly assert, causal relationships fundamental to reality, and are discovered rather than invented.[2]

4 0
3 years ago
Which of the following statements about enthalpy is true?
Evgesh-ka [11]

Answer:    A chemical process must occur and then changes between the state of the reactants and the state of the products can be determined

Explanation:  Enthalpy represents the sum of the energy of the system with the product of the pressure and volume of that system. As a thermodynamic property, it expresses the ability to release heat from the system. In fact, enthalpy  tells us how much heat and work has changed during the chemical reaction under constant pressure. When measuring, measurements of the difference in enthalpy between the two states of the system is performed, before and after the chemical reaction, since total enthalpy can not be measured. This measurement of the enthalpy change can tell us, for example, whether the heat was released from the system during the reaction, or the system absorbed the heat.

7 0
3 years ago
Please help! I don't get this one!!
Aneli [31]
Ph = A
Acid = C
Base = D
Litmus paper = B
Term = ?
5 0
3 years ago
Read 2 more answers
Tell me what acid-base properties can determine if a household chemical is an acid, base, or neutral substance.
vladimir2022 [97]

Explanation:

  1. Tasting; acid is sour to the tongue while bases taste bitter
  2. Litmus test; acid turn blue litmus red while bases turn red litmus blue
  3. Texture; acids are usually sticky while bases are soapy and slippery
  4. Reactivity; acids react mainly with metals to produce hydrogen gas while base mainly react with fats and oils

3 0
3 years ago
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