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geniusboy [140]
3 years ago
11

Plz help i’m gonna cry i’m in class rn

Chemistry
1 answer:
iragen [17]3 years ago
3 0

Answer:

if ur gonna cry then just dont cry its simple logic guyss!!!!!!!!!!!!

Explanation:

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How long does it take for 87.5 % of each isotope to decay?
Zolol [24]

Answer:

Kr-73 = 23.625 sec

Kr-74 = 10.0625 minutes (603.75 seconds)

Kr-76 = 12.95 hours (777 minutes)

Kr-81 = 1.8375 * 10^6 years

Explanation:

What you do is multiply each of those amounts by 7/8.

27 * 7/8 = 189/8 = 23.625

23/2 * 7/8 = 161/16 = 10.0625

74/5 * 7/8 = 518/40 = 259/20 = 12.95

210000 * 7/8 = 1470000/8 = 183750 = 1.8375 * 10^6

7 0
3 years ago
Which of these is a physical property
Mariulka [41]

Answer:The purpose of the Morrill Land Grant Act and the Homestead Act.

Began agriculture and mechanical colleges, homestead act to create farms for a small fee to help with the food shortage during the civil war.

A.boiling point

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C. Reactivity

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3 0
3 years ago
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vova2212 [387]

Answer:

The balanced chemical equation is Pb(NO3)2 + 2KI produces PbI2 + 2K(NO)3. In chemistry, this is called a double replacement reaction. Lead nitrate and potassium iodide, which are the reactants, are powders that react to form a yellow-colored lead iodide and a colorless potassium nitrate.

Explanation:

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Ksenya-84 [330]
Answer is: 2Zn + O₂ → 2ZnO (2Zn²⁺ + 2O²⁻).
Unbalanced chemical reaction: Zn + O₂ → ZnO.
Zn → Zn²⁺ + 2e⁻ / ×2; 2Zn → 2Zn²⁺ + 4e⁻.
4e⁻ + O₂ → 2O²⁻.
Zinc lost two electrons and became Zn²⁺, molecule of oxygen gain four electrons and become 2O²⁻.  Multiply first reaction with two to have same number of electrons and put coefficients in chemical reaction.

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3 years ago
Which factor is included in the ideal gas law that isn't present in the others?
rodikova [14]

Number of moles

Explanation:

From the general formula of ideal gas equation it is seen that number of moles is present and absent in other gas equations

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3 years ago
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