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3 years ago

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What ion will be formed by the selenium atom shown below when it has a stable set of valence electrons? Selenium atom A. Se6+ B.

Se2+ C. Se6− D. Se2−

1 answer:

ella [17]3 years ago

4 0

The ion that will be formed by the selenium atom shown below when it has a stable set of valence electrons is D) Se2-.

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Chem<br> Equations<br> Balance and Classify each of the following equations into:<br> Combination reaction, Decomposition Reacti

Arlecino [84]

Answer :

(A) The balanced chemical reaction will be:

$2KBr(aq)+Cl_2(g)\rightarrow 2KCl(aq)+Br_2(l)$

This reaction is a single replacement reaction.

(B) The balanced chemical reaction will be:

This reaction is a double displacement reaction.

(C) The balanced chemical reaction will be:

$N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$

This reaction is a combination reaction.

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of an element present on reactant side must be equal to the product side.

Part (A):

The balanced chemical reaction will be:

$2KBr(aq)+Cl_2(g)\rightarrow 2KCl(aq)+Br_2(l)$

This reaction is a single replacement reaction in which the most reactive element displaces the least reactive element from its solution.

Part (B):

The balanced chemical reaction will be:

$CaBr_2(aq)
+H_2SO_4(aq)\rightarrow CaSO_4(s)+2HBr(g)$

This reaction is a double displacement reaction in which a positive cation and a negative anion of two reactants exchange their places to form two new products.

Part (C):

The balanced chemical reaction will be:

$N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$

This reaction is a combination reaction in which the two atoms combine to form a larger molecule.

3 0

3 years ago

Mass=35g<br> density=5 g/cm3<br> what is the volume?

sladkih [1.3K]

Answer:

You would divide the mass by the density. The volume would be 7 cm^3.

3 0

3 years ago

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What are the strengths and limitations of a cell?

Dmitry [639]

Cells have limitations, if the cell is stronger it targets other cells , when a cell is weak it possibly mean it’s disease.

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3 years ago

??? I know it's hard to make out but please help xx15 points

baherus [9]

Answer is C. 2, 3 and 5 shows how as the number of carbon increase, butane, pentane and hexane (4,5 and 6 carbons) the octane number does decrease

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3 years ago

3. The sum of gravitational potential energy and kinetic energy is called mechanical

SCORPION-xisa [38]

Answer:

Explanation:

Mechanical energy = Kinetic energy + Potential energy

We shall calculate mechanical energy at different points of time .

Time Kinetic energy Potential energy mechanical energy

0 0 4 4

2 2 2 4

4 4 0 4

6 2 2 4

8 0 4 4

10 2 2 4

and so on ........

Hence we see that total mechanical energy is constant at the value of 4

at all time .

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3 years ago