Answer:
only chlorine can expand its octet.
Explanation:
An atom can expand its octet is it has empty d orbital
the electronic configuration of given elements will be:
B : 1s2 2s2 2p1 [Valence shell n =2 no d orbital]
O :1s2 2s2 2p4 [Valence shell n =2 no d orbital]
F : 1s2 2s2 2p5 [Valence shell n =2 no d orbital]
Cl :1s2 2s2 2p6 3s2 3p5 3d0 [Valence shell n =2 no d orbital]
Out of given elements only chlorine has empty d orbitals in its valence shell
Thus only chlorine can expand its octet.
released the drugs into the cancer cells?
a) Graphite and diamond because these well known substances have been used
for years to treat cancer
b) Graphite because it is found in pencils and is a good lubricant
c) Fullerene and carbon nanotubes because they have empty spaces inside the
molecules
d) Diamond because it is one of the hardest substances
Answer:
c) Fullerene and carbon nanotubes because they have empty spaces inside the molecules
Explanation:
Fullerene and carbon nanotubes would be the most desired in order to hold the cancer fighting drugs and to carry them through the body safely.
B. The forward and backward reactions are equal.
C. The forward and backward reactions stop happening.
D. The reactants are changed into products.
SUBMIT
At chemical equilibrium,the forward and backward reactions are equal and opposite.
Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.
Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.
Learn more about chemical equilibrium,here:
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B. The forwards and backwards motions are equal
Answer:
0.278 mol
Explanation:
Step 1: Given and required data
Mass of acetic acid (m): 16.7 g
Chemical formula of acetic acid: CH₃COOH (C₂H₄O₂)
Step 2: Calculate the molar mass (M) of acetic acid
We will use the following expression.
M(C₂H₄O₂) = 2 × M(C) + 4 × M(H) + 2 × M(O)
M(C₂H₄O₂) = 2 × 12.01 g/mol + 4 × 1.01 g/mol + 2 × 16.00 g/mol = 60.06 g/mol
Step 3: Calculate the number of moles (n) of acetic acid
We will use the following expression.
n = m/M
n = 16.7 g/(60.06 g/mol) = 0.278 mol
completely neutralize 150.0 milliliters of 0.100 M
NaOH(aq)?
A. 62.5 mL
B. 125 ml
C.
180. mL
D. 360. mL
Answer:
B) 125 mL
Explanation:
M1V1=M2V2
(0.120M)(x)=(150.0 mL)(0.100M)
x= 125 mL
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Answer:
Mass of CO2 produced = 944.43 -lb/year
Since 944.43 -lb is close to 1000 -lb, it is a reasonable statement.
Explanation:
Assumptions:
Car mileage = 20 miles/gallon:
Density of gasoline = 0.702 g/ml
Volume of gallons per week = (20 miles/week) / (20 miles/gallon) = 1 gallon/week
Volume of gasoline per year = 52 weeks * 1 gallon/week = 52 gallons
1 gallon = 3.8 litres or 3800 ml
52 gallons = 52 * 3800 = 197600 ml
Mass of gasoline = volume *density
Mass of gasoline = 197600 ml * 0.702 g/ml
Mass of gasoline = 138715.2 g
Equation of reaction:
2C8H18 + 25O2 ---> 16CO2 + 18H2O
2 moles of octane produces 16 moles of CO2
Molar mass of octane = 114 g/mol; molar mass of CO2 = 44 g/mol
114 * 2 g of octane = 44 * 16 g of CO2
138715. 2 g of octane produces = (138715.2 * 44 * 16) / 114 * 2 of CO2
Mass of CO2 produced = 428313.6 g of CO2 = 428.3136 Kg
Mass of CO2 produced in -lb weight = 428.3136 * 2.205
Mass of CO2 produced per year = 944.43 -lb CO2
Since 944.43-lb is close to 1000 -lb, therefore, it is a reasonable statement.