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nydimaria [60]
3 years ago
9

Which of the following statements is true?

Chemistry
1 answer:
seropon [69]3 years ago
5 0
Answer: option <span>D Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.

Justification:

1) The rate of chemical reactions are affected by: concentration of the reactants, state of the reactants, temperature, and presence of catalizers. So the first part of the statement is true.

2) Nuclear decay rates are constant. The decay depends on the nature of the element but not the conditions. That is why dating fossils with radiactive isotopes is possible. So, the second part of the statement is true.
</span>
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What is the relationship between frequency and wavelength?
IrinaVladis [17]

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frequency it the measure of the wave length. The measure of the peaks and troughs is how you measure the frequency. the distance between these is the wave length.

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3 years ago
4. Which is produced when a base reacts with water?
Dennis_Churaev [7]

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hydroxide ion

Explanation:

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Determine the oxidation number of the element "J" in H3JO2-
igor_vitrenko [27]

Answer:

Oxidation number:

3*1+ oxidation number of J+2*-2= -1

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2 years ago
In trying to control fall armyworms in crops, an Agriculture extension officer applied cypermethrin which was prepared by dissol
sveta [45]

Answer:

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.0086

Explanation:

Mole fraction remains a sort of concentration. It indicates:

moles of solute / (moles of solute + moles of solvent)

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Solute: Cypermethrin → C₂₂H₁₉Cl₂NO₃

Solvent: Water (PM = 18g/mol)

We calculate moles from solvent: 1000g /18 g/mol = 55.5 moles

We calculate PM for C₂₂H₁₉Cl₂NO₃

12g/mol . 22 + 1g/mol . 19 + 35.45 g/mol . 2+ 14g/mol + 16g/mol . 3 = 416 g/m

Moles of solute: 200 g / 416g/mol = 0.481 moles

Total moles: 0.481 + 55.5 = 55.98 moles

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.481 moles / 55.98 moles = 0.0086

8 0
2 years ago
Explain why the elements in group 7 have 7<br> valence electrons.
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Answer:

The periodic table was made that way by the scientists who created it

Explanation:

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6 0
3 years ago
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