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
solniwko [45]
3 years ago
15

Which of these elements has two valence electrons?

Chemistry
1 answer:
zhannawk [14.2K]3 years ago
4 0
Hydrogen only has 1 electron so not A.
Barium has 2 valence electrons so answers B!
You might be interested in
HELP<br> How can you tell if mass is being conserved
Murljashka [212]
I can help say like gas is steaming from a pot like you cooking on the gas is being conserved after it evaporates and liquid if you drink water it’s going into your body so it’s being conserved and solid said like i have a brick and you throw it and it breaks it had been conserved because it’s broken
8 0
3 years ago
7. Wind, moving water, falling rocks, and roller-skating children are all examples of -​
cluponka [151]

Answer:

kinetic energy

the is because all of them are moving at once

5 0
3 years ago
3. Which of the following organisms is
exis [7]

Answer:

Humans

Explanation:

4 0
3 years ago
When 2 moles of Na(s) react with H2O(l) to form NaOH(aq) and H2(g) according to the following equation, 369 kJ of energy are evo
enot [183]

Answer:

Exothermic

q = -8.03 kJ/g

Explanation:

<em>When 2 moles of Na(s) react with H₂O(l) to form NaOH(aq) and H₂(g) according to the following equation, 369 kJ of energy are evolved.</em>

The thermochemical equation is:

2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g)    ΔH = -369 kJ

Since the energy is evolved, the reaction is exothermic, which is why the enthalpy of the reaction (ΔH) is negative.

The heat released (q) per gram of Na(s) is (molar mass 22.98 g/mol):

\frac{-369kJ}{2molNa} .\frac{1molNa}{22.98gNa} =-8.03kJ/g

4 0
3 years ago
How many atoms are in one mole of sodium​
MakcuM [25]

Answer:

avogadros no

Explanation:

6.02x10^23 atoms

5 0
3 years ago
Other questions:
  • Tectonic plates make up which of the following layers of the Earth?
    12·1 answer
  • 2NH4Cl(s)+Ba(OH)2⋅8H2O(s)→2NH3(aq)+BaCl2(aq)+10H2O(l) The ΔH for this reaction is 54.8 kJ . How much energy would be absorbed if
    7·1 answer
  • PLEASE HELP!!
    14·2 answers
  • What group is helium in? Group 8 or group 2?
    8·2 answers
  • Wat is a redox reaction
    8·1 answer
  • Which of the following does each different kind of atom represent?
    7·1 answer
  • Which step you should take before performing a scientific investigation
    11·1 answer
  • Pls give me the right answer
    10·1 answer
  • Which is a non renewable resource A.oil b.sunlight c. Water d.wood
    13·2 answers
  • calculate q for the following: 125.0 ml of 0.0500 m pb(no3)2 is mixed with 75.0 ml of 0.0200 m nacl at 25oc chegg
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!