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gregori [183]
3 years ago
11

When calcium (Ca) is mixed with hydrochloric acid (HCl), a single replacement reaction occurs. What will be the product or produ

cts of the reaction? a.CaCl + H2
b.CaCl2
c.Ca + HCl
d.CaCl2 + H2
Chemistry
2 answers:
antiseptic1488 [7]3 years ago
8 0
The answer is C.) Ca + HCl
Sever21 [200]3 years ago
8 0

Answer:

The correct answer is option d: CaCl2 + H2

Explanation:

Hello!

Let's solve this!

When the Ca + HCl is joined there is a replacement reaction in which Ca takes the place of H and to balance loads, we need two atoms of Cl.

The resulting reaction is CaCl2 + H2

The complete reaction is

Ca + 2HCl ---> CaCl2 + H2

We conclude that the correct answer is option d: CaCl2 + H2

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Scilla [17]

Answer: 1.  C. polar covalent: electrons shared between silicon and sulfur but attracted more to the sulfur

2. B)  NH_3

3. B) Fluorine

Explanation:

1. A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.

Electronegativity difference = electronegativity of sulphur- electronegativity of silicon = 2.5 -1.8 = 0.7

Thus as electronegativity difference is less than 1.7 , the cond is polar covalent and as electronegativity of sulphur is more , the electrons will be more towards sulphur.

2. A molecular compound is usually composed of two or more nonmetal elements. Example: NH_3

Ionic compound is formed by the transfer of electrons from metals to non metals. Example: Mg_3N_2 , AlCl_3 and LiBr

3.  For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here K is having an oxidation state of +1 and as the compound formed is KZ, the oxidation state of non metallic element Z should be -1. Thus the element Z is flourine which exists as diatomic gas F_2

4 0
2 years ago
What is a dominant trait and a recessive trait
guajiro [1.7K]

Answer:

Dominant traits are always expressed when the connected allele is dominant, even if only one copy exists. Recessive traits are expressed only if both the connected alleles are recessive.

Explanation:

Freckles, cleft chin and dimples are all examples of a dominant trait.

5 0
2 years ago
Read 2 more answers
Which subatomic particle gives off visible light when it drops back down to a lower energy state?
icang [17]

Answer:

Option C = electron

Explanation:

Electrons are responsible for the production of colored light.

Electron:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e-

Mass= 9.10938356×10⁻³¹ Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

How electrons produce the colored light:

Excitation:

When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits.

De-excitation:

When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.

Other process may involve,

Fluorescence:

In fluorescence the energy is absorbed by the electron having shorter wavelength and high energy usually of U.V region. The process of absorbing the light occur in a very short period of time i.e. 10 ∧-15 sec. During the fluorescence the spin of electron not changed.

The electron is then de-excited by emitting the light in visible and IR region. This process of de-excitation occur in a time period of 10∧-9 sec.

Phosphorescence:

In phosphorescence the electron also goes to the excitation to the higher level by absorbing the U.V radiations. In case of Phosphorescence the transition back to the lower energy level occur very slowly and the spin pf electron also change.

5 0
2 years ago
Poisons are more serious and harmful than toxins if ingested because the _____ is lower. Small amounts of poison can be extremel
Step2247 [10]

Answer:

The death is lower

Explanation:

im gonna get a warning watch

3 0
2 years ago
THIS IS FOR MY FINAL EXAM IN CHEM!!!!!! PLEASE PLEASE PLEASE DON'T GUESS
Artemon [7]
A. soluble.
The are solubility rules that predict precipitation reaction.
7 0
3 years ago
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