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3 years ago

For an atom’s electrons, how many energy sublevels are present in the principal energy level n = 4?

Chemistry

2 answers:

ludmilkaskok [199]3 years ago

8 0

You would need to let us know the atomic number first. Sorry.

nignag [31]3 years ago

6 0

S, p, d, and f are possible for n=4

number of possible sublevels =n

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6. Think of some other chemical reactions. List them and the type of reaction: exothermic or endothermic. Example: Burning coal

Oksanka [162]

Remember: energy is conserved in a chemical reaction (visualize the reaction and question whether heat lies on reactant side (left) or product side (right))

-exothermic- heat is released (heat is on the product side)

>forming an ionic lattice (SALT)- mixture of Na and Cl results in a more stable ionic lattice, causing this reaction to be exothermic

>burning wood

-endothermic- heat is absorbed (heat is on the reactant side)

> cooking an egg

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2 years ago

A bond between a nonmetal and a nonmetal is called a(n)

Pani-rosa [81]

Answer:

answer: B

Explanation:

becaucse it is B

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2 years ago

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A solution of CaCl 2 in water forms a mixture that is 42.0 % calcium chloride by mass. If the total mass of the mixture is 839.6

Lerok [7]

Answer : The masses of calcium chloride and water used were, 352.6 g and 487.0 g.

Explanation :

As we are given that 42.0 % calcium chloride by mass that means 42.0 grams of calcium chloride present in 100 grams of solution.

In the solution or mixture, 42.0 % calcium chloride and 58.0 % (100-42.0=58.0) water.

Now we have to determine the mass of calcium chloride for 839.6 grams of solution.

As, 100 grams of solution contains 42.0 grams of calcium chloride

So, 839.6 grams of solution contains $\frac{42.0}{100}\times 839.6=352.6$ grams of calcium chloride

Thus, the mass of calcium chloride used is, 352.6 grams.

Now we have to determine the mass of water.

Mass of water = Mass of solution - Mass of calcium chloride

Mass of water = 839.6 g - 352.6 g

Mass of water = 487.0 g

Thus, the mass of water used is, 487.0 grams.

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3 years ago

Choose the pair in which the components have the same charge. question 6 options: a proton and a hydrogen atom a hydrogen atom a

worty [1.4K]

Answer:

A Neutron and a Hydrogen Atom

Explanation:

Hydrogen atom having an atomic mass of 1.008 amu consists of one proton and one electron. Hence, the +ve and -ve charges cancels out and makes the hydrogen atom a neutral specie.

Also, we know that neutron is neutral sub particle while, proton and electron are positively and negatively charged respectively. Therefore, a neutral neutron having no charge becomes equal to hydrogen atom having zero charge due to cancellation of both +ve and -ve charges.

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3 years ago

The freezing point of a 0.30 m KCl solution will have the same freezing point that a 0.20 m Ca(NO3)2 solution.

igor_vitrenko [27]

False freezing point does not depend on volume

6 0

3 years ago

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