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Pepsi [2]
3 years ago
8

A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number an

d number of protons. element symbol: mass number: number of protons:
Chemistry
1 answer:
Degger [83]3 years ago
5 0

Answer:

Kr, mass number 81, number protons 36.

Explanation:

If the atom has 36 electrons, and it is neutral, it has 36 protons. 36 protons means that this element has atomic number = 36. This is Kr.

Mass number = number protons + number neutrons = 36 + 45 = 81

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1
Liula [17]

Answer:

2

Explanation:

Equation of reaction

BaSO₄ + H₂SO₄ → Ba(HSO₄)₂

From the above equation of reaction, it is evident that there are 2 atoms in the product side of the reaction which is only logical because every chemical reaction obey the law of conservation of mass which states that matter can neither be created nor destroyed but can changed from one form to another.

In the reactant side, we have 2 atoms of S from the two reactants coming together.

One sulfur atom from BaSO₄ and the other from H₂SO₄. So therefore, only 2 sulfur can be produced since the reaction has to observe law of conservation of matter

6 0
3 years ago
Zinc Mass If a 1.85 g mass of zinc produces 475 mL of gas and your balloon weighs 0.580 g and the room temperature is 21.5°C. Ca
Alexus [3.1K]
The weight of the balloon is irrelevant because it is the gas that lifts it in the air. We are already given with the required volume, so we use this instead. The atomic weight of zinc is 65.38 g/mol. Assuming ideal gas behavior,

PV=nRT
P(475 mL)(1 L/1000 mL) = (1.85/65.38)(0.0821 L·atm/mol·K)(21.5 + 273)
P = 1.44 atm

Then, we use this pressure and the volume to find the moles of zinc.

(1.44 atm)(475 mL+1 mL)(1 L/1000 mL) = n(0.0821 L·atm/mol·K)(21.5 + 273)
Solving for n,
<em>n = 0.02836 moles of zinc</em>
3 0
4 years ago
Calculate the quantity of energy required to change 8.22 mol of liquid water to steam at 100oc. the molar heat of vaporization o
Ainat [17]
Since  the water  is  at  100 degrees  then   it take  40.6 kj/mol   to  change 1  mole of  water at 100 degrees into  steam at  100  degrees
  the  moles  of water  8.22mol
since  one  mole  take 40.6kj/mol   8.22mol  will  be  =
8.22mol  x  40.6 kj/mol =333.732  kj
 
4 0
3 years ago
7. Reproduce the following sentences as indicated in brackets. a. Urmila always goes to temple, .................... ? (Supply t
Tema [17]

Answer:

a. Urmila always goes to the temple, doesn't she?

b. Was the baby playing with the doll?

c. When will Peter start a business?

d. They have not finished the work yet.

e. She told me that her brother knows me.

f. Sita was married by Ram.

Explanation:

A. In grammar, a question tag is a very short clause at the end of a statement which changes the statement into a question. For example, in 'She said half price, didn't she?' , the words 'didn't she' are a question tag.

B. Interrogative questions/sentences often have to get a yes/no answer.

C. The "next year" will be the answer to that question. U need to ask when.

D. The have not done the work yet, therefore the answer would change from "not finish" to "have not finished"

E. Indirect speech is speech which tells you what someone said. It's like the game "telephone" indirect speech is what you tell someone else, what another person said, or what someone else tells you what another person said.

F. Passive voice means that a subject is a recipient of a verb's action.

4 0
2 years ago
Fill in the blank: after Mitosis, each daughter cell has identical
galina1969 [7]
Genes
when mitosis occurs it creates an exact copy of itself
7 0
3 years ago
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