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mash [69]
3 years ago
7

28 Which of the following compounds contains a transition metal? A. magnesium bromide (MgBr2) B. sodium chloride (NaCl) C. potas

sium hydride (KH) D. iron oxide (FeO)
Chemistry
1 answer:
kari74 [83]3 years ago
3 0
D iron oxide Fe is a transition metal
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A bottle of perfume is opened at one end of a room. A person sitting at the other end smells the perfume within a few minutes.
Contact [7]
D would be my best guess
6 0
3 years ago
A solution of HCl has a concentration of 3.4 x 10-3 M. What would be the [OH-] of this solution?
Debora [2.8K]

Answer:

a

Explanation:

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7 0
3 years ago
Which equation represents a change that results in an increase in disorder?(1 ) I2(s)=&gt;I2(g)
ankoles [38]

Answer : The correct option is, (1) I_2(s)\rightarrow I_2(g)

Explanation :

Entropy : It measures the disorderedness or randomness of the molecule.

That means higher the disorderedness, higher will be the entropy.

As we are going from solid state to liquid state, liquid state to gaseous state, the disorderedness increases due to the less inter-molecular interaction between the molecules.

And, as we are going from gaseous state to liquid state, liquid state to solid state, the disorderedness decreases due to the more inter-molecular interaction between the molecules.

(1) I_2(s)\rightarrow I_2(g)

In this reaction, the disorderedness increases because the state changes from solid to liquid.

(2) CO_2(g)\rightarrow CO_2(s)

In this reaction, the disorderedness decreases because the state changes from gaseous to solid.

(3) 2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)

In this reaction, the disorderedness decreases because the state changes from gaseous to solid.

(4) 2H_2(g)+O_2(g)\rightarrow 2H_2O(l)

In this reaction, the disorderedness decreases because the state changes from gaseous to liquid.

Hence, the correct option is, (1) I_2(s)\rightarrow I_2(g)

8 0
3 years ago
Read 2 more answers
For the gas phase decomposition of 1-bromopropane, CH3CH2CH2BrCH3CH=CH2 + HBr the rate constant at 622 K is 6.43×10-4 /s and the
Radda [10]

Answer is: activation energy of this reaction is 212,01975 kJ/mol.<span>
Arrhenius equation: ln(k</span>₁/k₂) = Ea/R (1/T₂ - 1/T₁).<span>
k</span>₁ = 0,000643 1/s.<span>
k</span>₂ = 0,00828 1/s.

T₁ = 622 K.

T₂ = 666 K.

R = 8,3145 J/Kmol.

<span> 1/T</span>₁ = 1/622 K = 0,0016 1/K.<span>
1/T</span>₂ = 1/666 K = 0,0015 1/K.<span>
ln(0,000643/0,00828) = Ea/8,3145 J/Kmol · (-0,0001 1/K).
-2,55 = Ea/8,3145 J/Kmol </span>· (-0,0001 1/K).<span>
Ea = 212019,75 J/mol = 212,01975 kJ/mol.</span>

6 0
3 years ago
6. 7. A hyperbaric chamber has a volume of 200. L. (a) How many moles of oxygen are needed to fill the chamber at room temperatu
Otrada [13]

Answer:

a) 24.7 mol

b) 790 g

Explanation:

Step 1: Given data

  • Volume of the chamber (V): 200. L
  • Room temperature (T): 23 °C
  • Pressure of the gas (P): 3.00 atm

Step 2: Convert "T" to Kelvin

We will use the following expression.

K = °C + 273.15

K = 23°C + 273.15 = 296 K

Step 3: Calculate the moles (n) of oxygen

We will use the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 3.00 atm × 200. L/(0.0821 atm.L/mol.K) × 296 K = 24.7 mol

Step 4: Calculate the mass (m) corresponding to 24.7 moles of oxygen

The molar mass (M) of oxygen ga sis 32.00 g/mol. We will calculate the mass of oxygen using the following expression.

m = n × M

m = 24.7 mol × 32.00 g/mol = 790 g

6 0
3 years ago
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