Where are the following elements to choose from?
Negative is bad and positive is good
From the given pH, we calculate the concentration of H+:
[H+] = 10^-pH = 10^-5.5
We then use the volume to solve for the number of moles of H+:
moles H+ = 10^-5.5M * 4.3x10^9 L = 13598 moles
From the balanced equation of the neutralization of hydrogen ion by limestone written as
CaCO3(s) + 2H+(aq) → Ca2+(aq) + H2CO3(aq)
we use the mole ratio of limestone CaCO3 and H+ from their coefficients, which is 1 mole of CaCO3 is to react with 2 moles of H+, to compute for the mass of the limestone:
mass CaCO3 = 13598mol H+(1mol CaCO3/2mol H+)
(100.0869g CaCO3/1mol CaCO3)(1kg/1000g)
= 680 kg
Answer:
Here's what I get
Explanation:
1. Fluorine
a. Each fluorine atom has seven valence electrons.
b. Fluorine is a nonmetal.
c. The combination of these atoms creates a covalent bond.
d. The atoms share a pair of valence electrons.
e. In the ionic bond, an electron moved from one atom to the other one.
f. The molecule forms a straight line.
2. Oxygen
a. Each oxygen atom has six valence electrons.
b. Oxygen is a nonmetal.
c. The combination of these atoms creates a covalent bond.
d. The atoms share two pairs of valence electrons.
e. The bond has four electrons instead of two.
f. The molecule forms a straight line.
Answer:
They prove that all animals evolved from a single ancestor