a. 1
b. 7
c. 3
d. 10
B) The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.
C) The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.
D) The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.
Answer: The correct answer is Option A.
Explanation:
Chemical reactivity is defined as the tendency of an atom to loose or gain electrons.
Metals are the elements that looses electrons and thus, their chemical reactivity will be the tendency to loose electrons.
Their chemical reactivity decreases as we move from left to right in a period. This is so because, the electron get added up in the same shell. So, the electron in the outermost orbital gets more tightly bonded to nucleus. And hence, loosing an electron will require high energy. Thus, the chemical reactivity decreases.
These metals will loose 1 electron to form +1 ions.
These metals will loose 2 electrons to form +2 ions.
Hence, the correct answer is Option A.
LOTS OF POINTS PLZ HELP
Answer:
Exothermic reaction
Explanation:
Notice that the energy component is located on the right side of the reaction. The right side is always known as the product side. Whenever energy is located there, the reaction is known to give off energy - essentially, we can say that energy is a product, as well. Reactions that give off energy are known as exothermic reactions.
On the other hand, if the energy component was located on the left side, or reactant side, of the equation, it would be known as an endothermic reaction.
Here, it's exothermic.
Hope this helps!
Answer: Heat equation
(2) LiCl(s) (4) NH3(l)
The sample of matter that can be separated into different substances by physical means is NH₃(g), which represents gaseous ammonia. Therefore, option D is correct.
Physical means, such as changes in temperature or pressure, can cause NH3 gas to condense into a liquid state (NH₃(l)) or freeze into a solid state (NH₃(s)). These changes in physical state can be reversed, allowing the substance to be separated into its different forms without changing its chemical composition.
Gaseous ammonia consists of individual NH₃ molecules that are not strongly bonded to each other. This state can be separated into its individual molecules using physical means.
Learn more about ammonia, here:
#SPJ2
Answer:
(1) LiCl(aq)
Explanation:
Question:
Which sample of matter can be separated into different substances by physical means?
1. LiCl(aq) ✔
2. LiCl(s) ❌
3. NH₃(g) ❌
4. NH₃(ℓ) ❌
Reason:
LiCl(a) is a mixture of a compound and water. The LiCl can be separated from the water. All the other choices are compounds.
Related Vocabulary:
- Aqueous: a water solution , indicated by the notion "(aq)". For example, HCl(aq) indicated a water solution of hydrochloric acid.
- Matter: Anything that has mass and takes up space.
Answer:
The correct statement is that the concentration of the acid in the solution will increase.
Explanation:
On the basis of the given question, if one dissolves 10 milliliters of acid in a beaker of water, the acid will get diluted. As the number of moles of acid is not going to change, thus, one can use the formula:
M1V1 = M2V2
Here, M is the concentration of the acid in the solution,
V1 = 10 ml
V2 = V water + 10
If we supplement, an other 5 ml of acid, the new concentration of the acid will be:
M = M1 (5 ml) + M2 (Vwater + 10 ml) / (5 ml + V water + 10 ml)
Therefore, the concentration of the acid in the new solution will increase.
Answer:
the concentration of acid in the solution has been increased.
Explanation:
the answer is C on edge.
b. NO
c. CO
d. N₂
Can anyone explain this one for me?