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Nataliya [291]
3 years ago
6

How many experimental trials are needed before a hypothesis can be accepted as true ?

Chemistry
2 answers:
Lorico [155]3 years ago
6 0
Approximately, or at least the test must be repeated until 3 times, to find an accurate average and hypothesis.
Lerok [7]3 years ago
4 0
3 times or more because you need to have 3 trails or more to be able to explain why your hypothesis is correct!!
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PLEASE Answer asap! What characteristics are shared by all alkali metals and alkaline earth metals?
agasfer [191]

Answer:

C

Explanation:

Mostly all of them but most likely C

6 0
3 years ago
When 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because:
noname [10]

7.5 mol of hydrogen would be needed to consume the available nitrogen.

Explanation:

When hydrogen reacts with nitrogen, ammonia is formed as shown below;

3H₂ (g) + N₂ (g) → 2NH₃ (g)

As seen from the equation, every 3 moles of H₂ react with a mole of N₂ to form 2 moles of NH₃.

The limiting factor in a chemical reaction is the reactant that gets depleted first.

Because the molar mass of nitrogen gas is approximately 28g/mol, 70g of nitrogen gas would be 2.5 moles.

The reaction ratio of nitrogen to hydrogen in the reaction is 1 : 3. The reaction would require 2.5 * 3 (7.5) moles of hydrogen for a complete reaction.

However since there are only 7g on hydrogen, (Remember 1 mole of H₂ is approximately 2g), the available moles of H₂ is 7 / 2 = 3.5

3.5 moles fall short of the 7.5 moles of H₂ required for a complete reaction. H₂ gets depleted first before N₂.  The reaction would require 4 more moles of H₂.

6 0
3 years ago
If a chemist analyzes a 3.84g sample containing sand and table sugar, and recovers 1.43g of      sand, what  percent by mass of
n200080 [17]
We are given with a mixture of sand and table sugar. The mixture has a mas s of 3.84 grams. After recovery, it was found out that there is 1.43 grams of sand. The amount of table sugar then is 3.84-1.43 or 2.41 grams. This is equal to 2.41/3.84 or 62.76% by mass/
4 0
3 years ago
What is the volume, in liters, of 2.00 moles of hydrogen at STP?
Ber [7]
The volume of one mole of any gas at STP is 22.4 L. So, at STP, the volume of 2.00 moles of hydrogen gas would be (22.4 L/mol)(2 mol H2) = 44.8 L.
8 0
3 years ago
Which atomic property is different in each isotope of an element?
Levart [38]
Elements that have different atomic mass
3 0
4 years ago
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