1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
yawa3891 [41]
3 years ago
9

Two elements in the second transition series (Y through

Chemistry
2 answers:
ziro4ka [17]3 years ago
4 0

Answer:

Technetium and Rhodium

Explanation:

For Technetium, Symbol: Tc

Atomic number: 43

Electron configuration: [Kr] 4d55s2

Atomic mass: 98 u

For Rhodium, Symbol: Rh

Electron configuration: [Kr] 4d85s1

Atomic number: 45

Atomic mass: 102.9055 u

alukav5142 [94]3 years ago
4 0

Answer:

Technetium (Tc) and Rhodium (Rh)

Explanation:

The two elements in the second transition series ( Y through Cd) that have four unpaired electrons in their 3⁺ ions are

Tc [Kr] 4d⁵5s²  after losing 3 electron becomes Tc [Kr] 4d⁴ and

Rh [Kr] 4d⁸ 5s¹ after losing 3 electron becomes Rh [Kr] 4d⁶  where Kr is the electronic configuration of Krypton ( a noble gas)

so both  Technetium (Tc) and Rhodium (Rh) have four unpaired electrons

You might be interested in
For the formula shown, how many sulfur atoms are represented?
Tatiana [17]

Answer:

i also need the is question help!!!

Explanation:

8 0
2 years ago
The electron configuration belonging to the atom with the highest second ionization energy is ________.
Gemiola [76]

Answer:

Element Lithium

Explanation:

The element with the highest second ionization energy is lithium. It belongs to the alkaline metal group I.e group one metals

It has the highest second ionization energy because it is very difficult to remove the electron from the 1s orbital.

Its atomic number is 3. The electronic configuration is 1s2 2S1

5 0
3 years ago
2C2H2 + 5O2 → 4CO2 + 2 H2O How many grams of CO2 are required to react with exactly 3.00 mol of O2? 106 g 132 g 165 g 76.8 g
cricket20 [7]

Hey there!:

Given the reaction:

2 C2H2 + 5 O2 → 4 CO2 + 2 H2O

5 moles O2 ------------- 4 moles CO2

3.00 moles O2 ----------  ( moles of CO2 ?? )

moles of CO2 = 3.00 * 4 / 5

moles of CO2 =  12 / 5

moles of CO2 = 2.4 moles

So, molar  mass CO2 = 44.01 g/mol

Therefore:

1 mole CO2 -------------- 44.01 g

2.4 moles CO2 ---------- ( mass of CO2 )

mass of CO2 = 2.4 * 44.01 / 1

mass of CO2 = 106 g

Answer A


Hope that helps!

8 0
3 years ago
The average propane cylinder for a residential grill holds approximately 18 kg of propane. How much energy (in kJ) is released b
brilliants [131]
Combustion is a chemical reaction between a fuel and an oxidant, oxygen, to give off combustion products and heat. Complete combustion results when all of the fuel is consumed to form carbon dioxide and water, as in the case of a hydrocarbon fuel. Incomplete combustion results when insufficient oxygen reacts with the fuel, forming soot and carbon monoxide. 

The complete combustion of propane proceeds through the following reaction:
C_{3} H_{8} + 5O_{2} --> 3CO_{2} + 4H_{2}O

Combustion is an exothermic reaction, which means that it gives off heat as the reaction proceeds. For the complete combustion of propane, the heat of combustion is (-)2220 kJ/mole, where the minus sign indicates that the reaction is exothermic. 

The molar mass of propane is 44.1 grams/mole. Using this value, the number of moles propane to be burned can be determined from the mass of propane given. Afterwards, this number of moles is multiplied by the heat of combustion to give the total heat produced from the reaction of the given mass of propane.

 14.50 kg propane  x <u> 1000 g </u> x <u>  1 mole propane   </u>  x <u>  2220 kJ  </u>   
                                     1 kg              44.1 g                     1 mole

= 729,931.97 kJ
8 0
2 years ago
TRUE or FALSE: The rock closest to the ridge is newer and younger than the older rock
alina1380 [7]

Answer:true

Explanation:

7 0
3 years ago
Other questions:
  • A 1.30M solution of BaCl2 has a density of 1.230 g/ml. a) What is the mole fraction of BaCl2 in this solution?
    6·1 answer
  • Given the following reactions 2S (s) + 3O2 (g) → 2SO3 (g) ΔH = -790 kJ S (s) + O2 (g) → SO2 (g) ΔH = -297 kJ the enthalpy of the
    6·1 answer
  • Identify fossil types match each each type of fossil to its description
    13·2 answers
  • What three parts make up an atom?
    11·2 answers
  • Which substance is a combination of different atoms?
    11·2 answers
  • What factors are requierd for cloning
    15·1 answer
  • Calculate the molality of a 15.0% by mass solution of MgCl 2 in H 2O. The density of this solution is 1.127 g/mL. Group of answe
    7·1 answer
  • HELPPPP ASAPP 10 POINTS
    15·1 answer
  • Plz I nee help will give brainliest
    9·1 answer
  • Carbon exists in nature as three isotopes. Given the atomic masses and relative abundance of the isotopes, what is the average a
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!