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
Talja [164]
2 years ago
15

An atom has two valence electrons, but four shells. This element is a member of which group or family?

Chemistry
1 answer:
Vesna [10]2 years ago
8 0
The correct answer is C: the alkaline earth metals!
You might be interested in
How many grams is 20 moles of (nh4)2so4 please show work
ryzh [129]

n=20 mol

(NH)4 SO4

Atomic masses :

N- 14

H- 1

S- 32

O- 16

Therefore M= 14×2 + 1×8 + 32 + 16×4

= 132

m= nM

= 20×132

= 2640g

5 0
1 year ago
A reaction produces 10.5 L if oxygen, but was supposed to produce 1 mol of oxygen. What is the percent yield ? (One mole of any
Rzqust [24]
To answer this item, we assume that oxygen behaves ideally such that it is able to fulfill the following equation,

 PV = nRT

If we are to retain constant the variable n and V. 

The percent yield can therefore be solved through the following calculation,

   n = (10.5 L)/(22.4 L)   x 100%

Simplifying,
    n = 46.875%

Answer: 48.87%
5 0
3 years ago
Why do you use the same amount of water for each shape of ice?
Fiesta28 [93]

Answer:

Ice is a solid form of liquid. Water simply expands when it freezes.

The same amount of water for each shape of ice because the melting  rate of ice depends on the surface area of each shape. So the same amount of water or volume with a large surface area will remain frozen for longer time.

4 0
3 years ago
In a constant‑pressure calorimeter, 70.0 mL of 0.350 M Ba(OH)2 was added to 70.0 mL of 0.700 M HCl. The reaction caused the temp
asambeis [7]

Answer:

ΔH = 57 Kj/mole H₂O

Explanation:

6 0
3 years ago
Read 2 more answers
Draw an electrolytic cell in which Mn2+ is reduced to Mn and Sn is oxidized to Sn2+. (Assume standard conditions).
babunello [35]

Answer:

-1.05 V

Explanation:

A detailed diagram of the setup as required in the question is shown in the image attached to this answer. The electrolytes chosen are SnCl2 for the anode half cell and MnCl2 for the cathode half cell. Tin rod and manganese rod are used as the anode and cathode materials respectively. Electrons flow from anode to cathode as indicated. The battery connected to the set up drives this non spontaneous electrolytic process.

Oxidation half equation;

Sn(s) ------> Sn^2+(aq) + 2e

Reduction half equation:

Mn^2+(aq) + 2e ----> Mn(s)

Cell voltage= E°cathode - E°anode

E°cathode= -1.19V

E°anode= -0.14 V

Cell voltage= -1.19 V - (-0.14V)

Cell voltage= -1.05 V

8 0
3 years ago
Other questions:
  • What is produced at each electrode in the electrolysis of agf(aq)?
    13·1 answer
  • Dolphins communicate using compression waves (longitudinal waves). Some of the sounds dolphins make are outside the range of hum
    5·1 answer
  • What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52?
    14·1 answer
  • Match the following descriptions with the correct polysaccharide, note if you answer any part of this question incorrectly a sig
    13·1 answer
  • What is number “4” in SiCi4?
    12·1 answer
  • Which description is not a property of a base? (2 points)
    6·2 answers
  • Which compound most likely has the greatest bond energy?
    15·2 answers
  • Calculate the molarity of a KCl solution if 37.3 g of KCl are dissolved in water to give a
    12·1 answer
  • And a 40N Torce in a southeriy direction?
    9·1 answer
  • 5. When sodium, a metal, is added to water, it reacts vigorously to form two new substances
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!