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Norma-Jean [14]
3 years ago
13

Please help me out with these questions please.. Both are in 1 picture:)

Chemistry
2 answers:
jeka57 [31]3 years ago
8 0

Answer:

1. B

2. C

Explanation: The law that the properties of the elements are periodic functions of their atomic numbers. And the second one is, most of the air we breathe is made of oxygen.

saw5 [17]3 years ago
4 0
The first Answer is A and the second is B
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Which of these is NOT a point of the Kinetic-Molecular theory?
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Answer: Gas molecules are pulled together by inter-molecular forces.

Explanation:

One of the postulate of the Kinetic Molecular Theory of gas state that, there are no force of attraction or repulsion between gas molecules.

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3 years ago
the specific heat of iron is 0.4494 j/g°C. how much heat energy (kj) is transferred when a 24.7 kg iron ingot is cooled from 880
guapka [62]
Answer is: 9623.85 kJ of heat is <span>transferred from iron ingot.
</span>m(Fe) = 24.7 kg · 1000 g/kg = 24700 g; mass of iron ingot.
C = 0.4494 J/g°C; t<span>he specific heat of iron
</span>ΔT = 880°C - 13°C; temperature <span>difference.</span>
ΔT = 867°C.
Q = m·C·ΔT.
Q = 24700 g · 0.4494 J/g°C ·867°C.
Q = 9623856.06 J ÷ 1000J/kJ.
Q = 9623.85 kJ.
8 0
4 years ago
What mass of silver chloride (m = 143.4) will dissolve in 1.00 l of water? the ksp of agcl is 1.8 × 10–10 ?
trapecia [35]
Given that solubility product of AgCl = 1.8 X 10^-10

Dissociation of AgCl can be represented as follows,

AgCl(s)             ↔      Ag+(ag)             +           Cl-(aq)

Let, [Ag+] = [Cl-] = S

∴Ksp = [Ag+][Cl-] = S^2

∴ S = √Ksp = √(1.8 X 10^-10) = 1.34 x 10^-5 mol/dm3

Now, Molarity of solution = \frac{\text{weight of solute}}{\text{Molecular weight X volume of solution (l)}}
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∴ Weight of AgCl present in solution = 1.92 X 10^-3 g

Thus, mass of AgCl that will dissolve in 1l water = 1.92 x 10^-3 g
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3 years ago
I can hit a metal with a hammer without the metal shattering because of its
kati45 [8]

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Explanation: cuz ... its right ... lol

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natka813 [3]
Exothermic processes: Making ice cubes,formation of snow in clouds


Endothermic processe: Melting ice cubes, evaporation of water
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