Answer:
When you balance a chemical equation you change coefficients.You never change subscripts. A coefficient is a whole number multiplier. To balance a chemical equation you add the coefficients to make sure there are the same number of atoms on each side of the arrow.
Explanation:
Hope this helps. MARK BRAINLEST!!
<span>Which profession is likely to use a radiation shield?
</span><span>A.)dentist
<em><u>B.)astronomer</u></em>
C.)mathematician
D.)geologist
The answer is B: Astronomer
</span>
Answer:
The pressure exerted by 66.0 g of CO₂ gas at -14.5°C that occupies a volume of 50.0 L is 0.636 atm.
How do we calculate pressure?
Pressure of any gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of gas = ?
V = volume of gas = 50L
R = universal gas constant = 0.082 L.atm/K.mol
T = temperature of gas = -14.5°C = 258.65 K
n is moles of gas and it will be calculated as:
n = W/M, where
W = given mass of CO₂ = 66g
M = molar mass of CO₂ = 44 g/mol
n = 66/44 = 1.5 moles
On putting values we get
P = (1.5)(0.082)(258.65) / (50)
P = 0.636 atm
Hence required pressure is 0.636 atm.
Explanation:
Hope This Helps
Have A Great Day
~Zero~
Answer:
Th answer to your question is:
a) 3.5 x10⁻¹⁰ meters; 0.35 nm
b) 6857142.86 atoms
c) Volume = 2.06 x 10⁻²³ cm³
Explanation:
a) data
Uranium atoms = 3.5A°
meters
1 A° ---------------- 1 x 10 ⁻¹⁰ m
3.5A° --------------- x
x = 3.5(1 x10⁻¹⁰)/ 1 = 3.5 x10⁻¹⁰ meters
1 A° ------------------ 0.1 nm
3.5 A° ---------------- 0.35 nm
b) 2.4 mm
Divide 2,40 mm / uranium diameter
But, first convert 3,5A° to mm = 3.5 x 10⁻⁷ mm
# of uranium atoms = 2.4 / 3.5 x 10⁻⁷ = 6857142.86
c) volume in cubic cm
Convert 3.5A° to cm = 3.5 x 10⁻⁸
Volume = 4/3 πr³ = (4/3) (3.14)(1.7 x10⁻⁸)³
Volume = 2.06 x 10⁻²³ cm³
Exothermic:
An Exothermic reaction is a chemical reaction that expels energy in the form of heat/light. Everything a Endothermic does not do. Pretty simple for this one
reactants → products + energy.
For future reference - Exo means release, thermic means heat.
<u>Energy is a Reactant </u>
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<u>_________________________________________________________</u>
Endothermic:
An Endothermic reaction essentially is draining the heat energy from anything its its surroundings. Usually its just heat but can also be salt dissolving it water or ice melting. Another example would be frost on your windshield evaporating.
It is the exact opposite of an Exothermic reaction.
<u>Energy is a Product</u>
