Answer:
Molarity = 0.002 M
Explanation:
Given data:
Mass of calcium chloride = 0.321 g
Volume of water = 1.45 L
Molarity of solution = ?
Solution:
Molarity = number of moles / volume in litter.
We will calculate the number of moles of calcium chloride first.
Number of moles = mass/molar mass
Number of moles = 0.321 g/ 110.98 g/mol
Number of moles = 0.003 mol
Molarity:
Molarity = 0.003 mol / 1.45 L
Molarity = 0.002 M
Answer:
creat and trough are the parts of transverse wave
The correct answer is:
b: Heluim
Explanation:
The caffeine contains:
carbon , nitrogen , oxygen ,
hydrogen.
Caffeine is a primary nervous system energizer of the methylxanthine class. It is the world's most universally consumed psychoactive drug. Unlike many other psychoactive elements, it is fair and unlimited in nearly all parts of the world. Caffeine can be arranged as an alkaloid, a term used for substances originated as end results of nitrogen metabolism in some plants.
Use mv=mv, plug in the know 1x9.24=3m. Solve for m, which m is 3.08M
Redox
reactions are those in which the oxidation numbers of the elements involved are
changed.
Equation
1:
2Na(s)
+ Cl2(g) --> 2NaCl
The
oxidation numbers of Na and Cl in the reactant side are both zero because they
are in elemental form. In the product side, however, the oxidation numbers are
+1 and -1, respectively. Hence, this is an example of redox reaction.
Equation
2:
Cd(s)
+ Pb+2(aq) --> Cd2+(aq) + Pb(s)
The
oxidation numbers of Cd and Pb+2 in the reactant side are 0 and +2,
respectively. They are, however, +2 and 0 in the product side. Hence, this is
also a redox reaction.
Equation
3:
Pb(NO3)2(liq)
+ 2LiCl(aq) --> PbCl2(s) + 2LiNO3(aq)
The
oxidation numbers of the involved ions (both cations and anions) are not
changed. Hence, this is NOT an oxidation reaction.
Equation
4:
C(s)
+ O2(g) --> CO2(g)
Just
as the equation 1 and 2, the oxidation numbers of the reactants are not similar
to those in the product. Hence, this is an example of oxidation reaction.
