What net ionic equation describes the reaction when these solutions are mixed?Given the equation: Na3PO4 (aq) + CaCl2(aq) →
A. 2PO43–(aq) + Cl– (aq) → Cl2(PO4)3(s)
B. 2Ca2+(aq) + Na+(aq) → NaCa2(s)
C. Na+(aq) + Cl– (aq) → NaCl(s)
D. 2PO43–(aq) + 3Ca2+(aq) → Ca3(PO4)2(s)
Answers
2PO43–(aq) + 3Ca2+(aq) → Ca3(PO4)2(s)
Hope this answers the question. Have a nice day.
Answer:
Explanation:
In net ionic equation we remove the spectator ions. The ions which are present on both the side and are not forming any solid compound.
Let us write the balanced reaction first:
The ionic reaction is:
Thus net ionic reaction is
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An LED lightbulb has an energy efficiency of 89%. This means that 11% of the electrical energy that goes into an incandescent lightbulb is used to produce light energy.Which statement best explains what happens to the other 11% of the electrical energy that goes into the lightbulb?The leftover electrical energy is destroyedThe leftover electrical energy is transferred into heat energyThe leftover electrical energy is transferred into chemical energyThe leftover electrical energy is transferred into potential energy
The water in a 150-mL flask is poured into a beaker that contains 600 mL of ethyl alcohol. Which substance is the solvent in this mixture?
Answers
The radius of a positive ion always less than the radius of its neutral atom because the nucleus pulls the remaining electrons in closer.
What is an atom ?
Each atom is made up of a nucleus and one or more electrons that are linked to it. One or more protons and a significant number of neutrons make up the nucleus.
Only the most prevalent kind of hydrogen is neutron-free. The smallest component of ordinary stuff that makes up a chemical element is an atom.
Quarks and electrons are the two categories of fundamental particles that make up an atom. An atom's nucleus is surrounded by an area of electrons. The electrical charge of every electron is negative one.
Protons and neutrons, which together make up an atom's nucleus, are made of quarks.
Thus, option A is correct.
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(A)-This sounds accurate, but is actually not true. When an atom loses an electron and forms a positive ion, there will be less negative charge from the electrons to attract the positively charged nucleus. Losing electrons will actually decrease the attraction between the electrons and the nucleus.
(B)-This is true in some cases, but not all. If, for example, sodium were to lose an electron, it would drop down to having its largest orbital being in the second energy level, and would decrease in size. If magnesium were to lose an electron, it would still have one electron in the third energy level, so it wouldn't drop down an energy level.
(C) and (D)-Not sure where these answers even came from.
The actual reason behind the radius of a positive ion being smaller than the radius of its neutral atom is that the repulsive force between the electrons themselves is decreased, causing them to move closer together.
A) 8 g
B) 16 g
C) 32 g
D) 64 g
Answers
N₂ +2 O₂ → 2 NO₂
28.0 g -------> 32.0 * 2
7 g ----------> ?
Mass of O₂ = 7 * 32.0 * 2 / 28.0
Mass of O₂ = 448 / 28.0
= 16 g of O₂
Answer B
hope this helps!
Answer:
guy above is right
Explanation:
b. Saturated fatty acids contain many more bonds.
c. Saturated fatty acids have single carbon-to-carbon bonds.
d. Saturated fatty acids contain more carbon atoms.
Answers
Answers
Explanation:
Let's consider sulphate radical, the chemical formula is given by SO42−. Here we can see there is a -2 charge on SO4, which means it has -2 valency. Now look at the option (a), phosphate can be written as PO43−. There is -3 charge on PO4, that means it has -3 valency.
Explanation:
molecular formula of sulphate ion is SO₄²⁻
and
the valency of sulphate ion is 2.
Answers
endothermic and exothermic reactions.
4
O Endothermic reactions absorb heat
energy while exothermic reactions
release heat energy.
O Exothermic reactions absorb heat
energy while endothermic reactions
release heat energy.
O Endothermic and exothermic reactions
absorb thermal energy.
O Endothermic and exothermic reactions
release thermal energy.
REM
The prefix exo-
applied to a che
mean energy
re
Answers
Statement-1 is the correct answer that is Endothermic reactions absorb heat energy while exothermic reactions release heat energy.
How can we distinguish between exothermic and endothermic processes?
Chemical reactions that release energy are referred to as exothermic. More energy is produced than is needed to break the bonds between the reactants when bonds are formed in the byproducts of exothermic processes.
Chemical processes that either use or absorb energy are referred to as endothermic. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products. Since an isothermic chemical reaction uses exactly as much energy as it produces, there is no net energy change.
Therefore, the first statement is the right response.
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