Answer:
1, 2, 3
Explanation:
Using a simple chemical reaction as an example;
2H2 + O2 --> 2H2O
1) number of atoms
In the reactant side (left side of the reaction), there are 4 Hydrogen atoms which is equal with the number of atoms in the product (right side of the reaction). In the reactant side, there are 2 oxygen atoms, same thing with the product side. This means it is conserved.
2) Number of electrons
The number of electrons are also balanced. Although there is sharing of electrons, This means it is conserved.
3) In a chemical reaction, the law of conservation of matter is obeyed. Since the number of atoms is conserved, the mass is also conserved.
4) numbers of molecules
Although this is true for some reactions, it is not always the case as seen in the reaction above. This means it is not conserved.
Inert gases are also called noble gases. They are the elements found in Group 8A in the periodic table. They are inert because they don't react with other elements. This is because they have the most stable electronic configuration. That's why elements form ions to gain or give way electrons so that they conform with the electronic configuration of the nearest inert gas. Basing on the periodic table, the nearest inert gas to K is Argon. The nearest inert gas to I is Xenon.
Answer:
We need 247 mL of NaOH
Explanation:
Step 1: Data given
Molarity of NaOH = 0.587 M
Volume of 0.445 M NiBr2 solution = 163 mL = 0.163 L
Step 2: The balanced equation
NiBr2(aq) + 2NaOH(aq) Ni(OH)2(s) + 2NaBr(aq)
Step 3: Calculate moles of NiBr2
Moles NiBR2 = Molarity NiBR2 * volume
Moles NiBR2 = 0.445 M * 0.163 L
Moles NiBR2 = 0.0725 moles
Step 3: Calculate moles of NaOH
For 1 mol NiBr2 consumed, we need 2 moles NaOH
For 0.0725 moles NiBR2, we need 2* 0.0725 = 0.145 moles NaOH
Step 4: Calculate volume of NaOH
Volume = moles NaOH / Molarity NaOH
Volume = 0.145 moles / 0.587 M
volume = 0.247L = 247 mL
We need 247 mL of NaOH
Answer:
A gene is a region of DNA that encodes function. A chromosome consists of a long strand of DNA containing many genes. A human chromosome can have up to 500 million base pairs of DNA with thousands of genes.
Explanation:
Answer:
1.39
Explanation:
[Hg2Cl2]= 1M
[H^+] = ????
E°cell= 0.35V
E= 0.268 V
Therefore E for the reaction must -0.082 V
n= 2 moles of electrons
From Nernst Equation:
E= E°cell- 0.0592/n log [Red]/[Ox]
0.0268= 0.35- 0.0592/2 log 1/[Ox]^2
-0.082= -0.0296 log 1/[Ox]^2
log 1/[Ox]^2= 0.082/0.0296
log 1/[Ox]^2= 2.77
1/[Ox]^2=Antilog (2.77)
[Ox]^2=1.698×10^-3
[Ox] = 0.0412 M
But pH= -log [H^+]= -log(0.0412)= 1.385
