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
RUDIKE [14]
3 years ago
14

1. Which statement describes the properties of both elements that have just one valence electron and elements that have seven va

lence electrons?
They are highly reactive.
They are gases at room temperature.
They exist in nature as pure elements.
They easily give up an electron.

2. What are properties of the group of elements on the periodic table that have seven valence electrons?
High reactivity, metallic
High reactivity, nonmetallic
Low reactivity, metallic
Low reactivity, nonmetallic

3. When oxygen forms an ion, what is its charge?
2+
3+
2-
3-

4. Which of the following is a possible formula unit?
Li3Al
ClO2
LiCl
CaN


5. What does a Lewis structure show that makes it a useful model for a molecule?
All electrons in the atoms
Angles between bonds
How electrons are shared
Relative sizes of atoms

H
I
H - C - H
I
H

6. The structure looks like the lay out I’ve created above. The Lewis structure for methane, CH4 is shown. How many valence electrons does each hydrogen atom in the molecule have?
1
2
4
8


H-H
7. The structure looks like the layout I’ve created above. The Lewis structure for a hydrogen molecule, H2, is shown. The line segment in the structure shows that the two atoms
share one valence electron.
share two valence electrons.
have one unshared electron.
have two unshared electrons.

8. What is the molar mass of NaNO3?
42.0 g/mol
53.0 g/mol
73.0 g/mol
85.0 g/mol
Chemistry
2 answers:
trapecia [35]3 years ago
4 0

Answer:

1) They  are highly reactive.

2) They are highly reactive and are non metallic.

3) -2

4)LiCl

5) How electrons are shared

6) Each hydrogen electron has one valence electron

7) share two valence electrons

8) 85.0 g/mol

Explanation:

1) As both the kind of elements are ready to give or taken one electron, to attain noble gas configuration or full filled stability, they are highly reactive.

The element which has just one electron in valence shell will give the electron easily.

The element which has seven valence electrons will accept one electron easily.

2) Halogen have seven valence electrons. They are highly reactive as the are ready to take one electron. As they cannot give electrons they are non metals.

3) Generally oxygen can accept two electrons so its charge is "-2"

4) Formula unit is generally for ionic compound. LiCl is an ionic compound.

5) In lewis structure we write elements are then distribute electrons over all the atoms. It shows the number of bonded electrons, unshared or lone electrons as well.

6) The configuration of hydrogen is 1s1, thus it has only one valence electron/ atom.

7) In each covalent bond there are two shared electrons (shared by two atoms bonded).

8) molar mass = atomic mass of Na + Atomic mass of N + 3 X atomic mass of O

Molar mass = 23 + 14 + 3(16) = 85.0 g/mol

FromTheMoon [43]3 years ago
3 0
Q1. They are highly reactive. Q2. High reactivity, nonmetallic. Q3. Oxygen has an ion charge of -2. Q4. LiCl I believe. Q5. How electrons are shared. Q6 1. Q7. Share 2 valence electrons, I believe.
You might be interested in
**CHEMISTRY!! PLEASE HELP ASAP!!**
Minchanka [31]
Calcium = 1
Sulfur = 1
Oxygen = 4
6 0
3 years ago
Which of the following will reduce copper?<br> zinc<br> mercury<br> fluorine<br> chlorine
laiz [17]
Zinc because the only metals that would be able to reduce copper ions in solution would be hydrogen, lead, tin, nickel, iron, zinc, aluminum, Magnesium, sodium, calcium, potassium, and lithium. and according to your answer choices Zinc is the answer.
4 0
3 years ago
Read 2 more answers
Approximately 1 mL of two clear, colorless solutions-0.1 M Ba(NO3)2 and 0.1 M Na2SO4- were combined. Upon mixing, a thick, milky
murzikaleks [220]

Answer: balanced chemical equation: Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2NaNO_3(aq)

Net ionic equation : Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The balanced chemical equation is:

Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2NaNO_3(aq)

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

Ba^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+SO_4^{2-}(aq)\rightarrow  BaSO_4(s)+2Na^+(aq)+2NO_3^-(aq)

The ions which are present on both the sides of the equation are sodium and nitrate ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)

4 0
3 years ago
Which statement is correct with respect to gross primary productivity
bezimeni [28]
Gross primary production and net primary production. Gross primary production is the amount of chemical energy as biomass that primary producers create in a given length of time.
8 0
3 years ago
Which is an example of heat energy being transferred by radiation? * 10 points A A pot of water boils on a stove B Hot water mel
andrew11 [14]

Answer:

A

Explanation:

The stove is a form of gas, you feel the heat of the fire via radiation. CONVECTION. Heat transfer in fluids generally takes place via convection.

5 0
3 years ago
Other questions:
  • In the Hall-Heroult process, a large electric current is passed through a solution of aluminum oxide dissolved in molten cryolit
    12·1 answer
  • Describe the quantum model of an atom in terms of energy levels, sublevels, and orbitals. (Any atom is acceptable)
    8·1 answer
  • Is pentacosane a molecular compound?
    10·1 answer
  • Match the following type of reactions to the correct equation.
    11·1 answer
  • After wood burns, the ash weighs much less than the original wood. Explain why the law of conservation of mass is not violated i
    11·1 answer
  • What is the uncertainty of a 10ml pipet?​
    10·1 answer
  • If the Earth were to spin half as fast as it does now, how many hours would be in one day (one complete spin)?
    10·2 answers
  • A 1.0L buffer solution contains 0.100 molHC2H3O2 and 0.100 molNaC2H3O2. The value of Ka for HC2H3O2 is 1.8×10−5. Calculate the p
    8·1 answer
  • What is rainwater harvesting​
    15·2 answers
  • 1) 50.0 mL of water is measured out in a graduated cylinder. A rock with the mass of
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!