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Gnoma [55]
3 years ago
13

Can someone help me to answer the questions 8 and 9

Chemistry
1 answer:
Elena-2011 [213]3 years ago
3 0
Idk it's stupid do it yourself
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Weight measures
jasenka [17]

Answer: D) The effect of gravity on an object

Explanation: We're not talking about mass, we're talking about weight. Weight is measured by the force of gravity on a object. For examples, you might be 100 pounds on Earth but 12 pounds on the moon.

5 0
3 years ago
A rock sample from the moon includes a mineral that contains small amounts of the radioactive isotope Potassium-40 and its daugh
Simora [160]

Answer:

There were originally 8 atoms of Potassium-40.

Explanation:

The half-life of a radioactive material is the time taken for half the original material to decay or the time required for a quantity of the radioactive substance to reduce to half of its initial value.

If the original material formed without any Argon-40, it means that the atoms originally present were Potassium-40 atoms.

Presently, there are 7 Argon-40 atoms for every 1 of Potassium-40, we can deduce the number of half-lifes the Potassium-40 has undergone as follows :

After one half-life, (1/2) there will be one Potassium-40 atom for every Argon-40 atom.

After a second half life, 1/2 × 1/2 = 1/4: there will be one Potassium-40 atom for every three atoms of Argon-40.

After a third half-life, 1/4 × 1/2 = 1/8: there will be one Potassium-40 atom for every 7 atoms of Argon-40.

Since there are 1/8 atoms of Potassium-40 presently, there were originally 8 atoms of Potassium-40.

6 0
3 years ago
Which apple has the greatest potential energy?
Vesnalui [34]

Answer:

D

Explanation:

It is higher in the air, so it will fall faster then the other apples.

5 0
2 years ago
Read 2 more answers
What is one property for each of the chemical substances listed above?
Vilka [71]
1. Acetic acid (Ethanoic acid) is a colorless liquid.

2. Sodium Bicarbonate is an odorless, crystalline powder.

3. Carbon dioxide is a colorless gas.

4. Dihydrogen monoxide is colorless and odorless gas.

5. Sodium acetate is very soluble in water.

6. Calcium chloride has an exothermic reaction when dissolved in water.

7. Calcium carbonate is also an odorless powder.

8. Sodium chloride is soluble in water, and partially soluble (or insoluble) in other liquids.

Hope this helps! (:
8 0
2 years ago
Are there more bones in the arm than in the leg?
hodyreva [135]
They have the same amount but if you count the wrist it was more then the leg and ankle.
6 0
3 years ago
Read 2 more answers
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