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kogti [31]
3 years ago
14

What term describes the time it takes for the amount of radioactivity in a material to decrease by one half

Chemistry
1 answer:
den301095 [7]3 years ago
6 0
Half-life (period)
-----------------------------
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Calculate the percent by mass of a solution of Ca(NO3)2 that has 22.63 g dissolved in 896.92 g of water.
never [62]

Hey there!

To calculate the percent by mass of the Ca(NO₃)₂ we need to find the total mass first by adding.

896.92 + 22.63 = 919.55

In total, the solution is 919.55 grams.

To find the percent of Ca(NO₃)₂ in the solution, divide the mass of Ca(NO₃)₂ by the total mass and multiply by 100.

22.63 ÷ 919.55 = 0.0246

0.0246 x 100 = 2.46

Ca(NO₃)₂ makes up 2.46% of the solution.

Hope this helps!

6 0
4 years ago
Which of the following coefficients will correctly
valentina_108 [34]

Answer:

#2 is the answer

Bcuz 2 times 2 = 4

8 0
3 years ago
How do erosion and deposition work together to form sand dunes?
Leona [35]

Answer:

Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.

Explanation:

Erosion can be defined as a geological process which involves the wearing away of earth material and transportation of these material  to another location by Natural agents such as wind and water. Erosion involves removal of top soil, rocks and other earth particles by action of wind, glacier and water.

Wind causes erosion by deflation. Deflation is the actual removal of grain of rocks . Generally, it s the lowering of land surface that happens as a result of removal of surface particles(sands grains) by wind. Deflation is usually prevalent in arid areas. This sand can later be picked up and deposited to form sand dunes . Sand dunes are mounds of sand formed by wind . This sands are sheltered by an obstacle. And sand dunes are prevalent in desert and or along the beach. The sand dune grows as sand accumulate.

8 0
3 years ago
Read 2 more answers
What does the number prefix tell you in the name of an alkene?
Rina8888 [55]

Answer:

The position of the double bond

Explanation:

7 0
3 years ago
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When coding a number in scientific notation, if you move the decimal point to the left, in order to get back to the original val
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Im pretty sure the answer should be negative
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4 years ago
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