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Svetach [21]
3 years ago
14

HELLPPPPP MEEMEMEMEME​

Chemistry
1 answer:
alukav5142 [94]3 years ago
6 0

Its the third answer

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The isotope Np-238 has a half life of 2.0 days if 96 grams of it were present on Monday how much will remain six days later
Neporo4naja [7]

Answer:

12 grams

Explanation:

For any radioactive substance

the amount of substance left after n half life  is given by = x/2^n

where x the original amount of substance.

____________________________________________

Half life of isotope Np-238 = 2 days

total no of days = 6

no of half life =total no of days/Half life of isotope Np-238 = 6/2 = 3

thus,

for our problem n = 3

initial amount of Np-238 = 96 grams

thus,

the amount of substance left after 3 half life = 96/2^3 = 96/8 = 12 grams.

Thus, 12 grams will be left after six days.

4 0
3 years ago
A double-replacement reaction takes place when aqueous K2SO4 reacts with aqueous Pb(NO3)2. You would expect one of the products
melomori [17]

A double displacement reaction is one in which the positive and negative ion in one reactant switch places with the positive and negative ions of the second reactant forming two new products.

In general if we have two reactants AB and CD, the double displacement reaction can form the following products:

A⁺B⁻ + C⁺D⁻ → C⁺B⁻ + A⁺D⁻

In the given example:

K₂SO₄ + Pb(NO₃)₂ → PbSO₄ + 2KNO₃

Ans: B)

One of the products would be PbSO₄

5 0
3 years ago
Read 2 more answers
Why are bacteria a necessary part of the nitrogen cycle
Black_prince [1.1K]
I think it is to help with plant growth, and converting nitrogen to ammonia.
6 0
3 years ago
Which of the following is best described by the term macroscopic?
n200080 [17]

Answer:

A

Explanation:

Since macroscopic means visible to the naked eye without a microscope it would be A. This is because we can see active phase changes in real time without any magnification like water boiling or ice melting.

4 0
3 years ago
Energy is the ability to do work or produce heat.<br> True<br> False
Dmitrij [34]

Answer: true

Explanation: hope this helpes

5 0
3 years ago
Read 2 more answers
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