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goldfiish [28.3K]
3 years ago
11

Which type of radioactive emission has a positive charge and weak penetrating power?

Chemistry
1 answer:
Wewaii [24]3 years ago
5 0
1. alpha particle
alpha particles are positively charged helium nuclei with weak penetrating power
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Bob adds heat to a substance. When enough heat is added, A. its particles move closer together and the substance becomes a gas.
Elena L [17]

Answer:

C. its particles move farther apart and the substance becomes a gas.

Explanation:

A. is wrong because moving closer together creates a solid, not a gas.

B. is wrong because moving father apart creates a gas, not solid.

C. is correct because moving farther apart creates a gas.

D. is wrong because when heat is added particles spread apart because they vibrate faster. Although, in a solid the particles are closer together.

- Just know the states of matter and how the particles move and that will help with this problem.

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3 years ago
3. What is the mass of HI used to create 2.50L of a 0.48 M solution of hydroiodic acid?
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Answer:

Mass = 153.48 g

Explanation:

Given data:

Volume of solution = 2.50 L

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Mass required = ?

Solution:

Molarity = number of moles / volume in litter

Number of moles = Molarity × volume in litter

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Mass = Number of moles × molar mass

Mass = 1.2 mol × 127.9 g/mol

Mass = 153.48 g

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Elena-2011 [213]

Answer:

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The answer to the question stated above is cumulus clouds. 
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