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tiny-mole [99]
4 years ago
5

What elements valence electrons are 5s^2 5p^4 A. Te B. Mo C. Pm D. Re

Chemistry
1 answer:
baherus [9]4 years ago
4 0
A. Te, Tellurium [Kr] <span>4d^10 5s^2 5p^4</span>
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Explain the difference betweeen mass and volume
sattari [20]
mass is the amount of matter in an object, and volume is the amount of space something takes up
7 0
3 years ago
When iron metal reacts with sulfuric acid, it produces iron (III) sulfate and hydrogen gas. Balance the equation: Fe + H2SO4 → F
gavmur [86]
<h3>Answer:</h3>
  1. Balanced Equation; 2Fe + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂
  2. Why balance?: To obey the law of conservation of mass
  3. Subscripts can not be changed, since they show the actual number of atoms of each element in a compound.
<h3>Explanation:</h3>
  • The balanced equation for the reaction between the iron metal and sulfuric acid to produces iron (III) sulfate and hydrogen gas is given by;

2Fe + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂

  • Balancing chemical equations ensures that they obey the law of conservation of mass which requires the mass of reactants and the mass of products to be equal.
  • Balancing is done by putting coefficients on reactants and products while not affecting the subscripts as subscripts show the actual number of atoms of an element in a compound.
6 0
3 years ago
Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq)HCl(aq), as descr
ra1l [238]

Answer: 0.887 g of MnO_2 should be added to excess HCl(aq).

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = 805 torr = 1.06 atm  (760torr=1atm)

V = Volume of gas = 235 ml = 0.235 L

n = number of moles = ?

R = gas constant =0.0821Latm/Kmol

T =temperature =25^0C=(25+273)K=298K

n=\frac{PV}{RT}

n=\frac{1.06atm\times 0.235L}{0.0820 L atm/K mol\times 298K}=0.0102moles

MnO_2(s)+4HCl(aq)\rightarrow MnCl_2(aq)+2H_2O(l)+Cl_2(g)

According to stoichiometry:

1 mole of chlorine is produced by = 1 mole of MnO_2

Thus 0.0102 moles of chlorine is produced by = \frac{1}{1}\times 0.0102=0.0102 moles of MnO_2

Mass of MnO_2 =moles\times {\text {Molar mass}}=0.0102mol\times 87g/mol=0.887g

0.887 g of MnO_2 should be added to excess HCl(aq).

7 0
4 years ago
What is meant by the statement "energy is quantized"?
Sveta_85 [38]

That means that the amount of energy can only be certain numbers, as if
energy came in tiny packets, and the in-between amounts don't exist.

Another example of a measurement in nature that is quantized is
electric charge.


5 0
3 years ago
How do you calculate the volume of a cube? A. with a graduated cylindar in mL? B. with a triple beam balance in g? C. with a bea
Nuetrik [128]

Answer:

B

Explanation:

triple beam balance

sorry if i am wrong! can be brainliest?

5 0
3 years ago
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