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3 years ago

Which of the following substances would complete a circuit and allow electricity to flow?

Chemistry

1 answer:

Elza [17]3 years ago

5 0

The substances which allow the current to flow in the circuit are:

Lithium bromide in a solution and Graphite.

Lithium bromide can be pass the current in the circuit, due to the ability to form ions in the solution Li⁺ and Br⁻ which are mobile and can transport the electrical charge.

In the graphite because of the presence of delocalised electrons, each carbon atom forms three covalent bonds with three other carbon atoms, it conducts electrical current.

In the case of potassium chloride lattice there are in a solid form and the atoms are not mobile so they can not form ions. In the diamond all the carbon valences are satisfied so the electrical charge can not be transported.

Nitric oxide in a solution is isolated and can not transport the electrical current due to its inability of the to form ions .

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A 14.3 g sample of HF is dissolved into 250 mL of solution. The concentration of the solution is *

STALIN [3.7K]

Answer:

The concentration of the solution is 2.86 M

Explanation:

Molarity is a unit of concentration based on the volume of a solution. It is defined as the number of moles of solute that are dissolved in a given volume. In other words, molarity is defined as the number of moles of solute per liter of solution.

The Molarity of a solution is determined by the following expression:

$Molarity (M)=\frac{number of moles of solute}{Volume}$

Molarity is expressed in units ( $\frac{moles}{liter}$ ).

In this case, you must then know the number of moles of HF, for which you must know the molar mass. Being:

H: 1 g/mole
F: 19 g/mole

the molar mass of HF is: HF= 1 g/mole + 19 g/mole= 20 g/mole

Then the following rule of three applies: if 20 g of HF are available in 1 mole, 14.3 g in how many moles will they be?

$moles=\frac{14.3 g*1 mole}{20 g}$

moles= 0.715

So:

number of moles of solute: 0.715 moles
Volume: 250 mL=0.250 L (being 1 L=1000 mL)

Replacing:

$Molarity=\frac{0.715 moles}{0.250 L}$

Solving:

Molarity= 2.86 $\frac{moler}{liter}$ =2.86 M

The concentration of the solution is 2.86 M

6 0

3 years ago

Why is it necessary to mix any solution that does not show an immediate change?.

mr_godi [17]

Answer:

Explanation:

It is to keep the mixture homogeneous

5 0

3 years ago

The burning of propane gas can be represented as a balanced chemical reaction as follows: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g) Calcula

Snezhnost [94]

Answer: 20L of H2O

Explanation:

C3H8 + 5O2 → 3CO2 + 4H2O

Recall 1mole of a gas contains 22.4L at stp

5moles of O2 contains = 5 x 22.4 = 112L

4moles of H2O contains = 4 x 22.4 = 89.6L

From the equation,

112L of O2 produced 89.6L H2O

There for 25L of O2 will produce XL of H2O i.e

XL of H2O = (25 x 89.6)/112 = 20L

6 0

3 years ago

An unknown insoluble substance displaced the water shown. It's mass is indicated on the triple beam balance. Mass = A. 694 B. 69

vodka [1.7K]

Answer:

D. 693.8.

Explanation:

The first scale of the triple beam balance indicate that the mass is 600.

The second scale of the triple beam balance indicate that the mass is 690.

The third scale of the triple beam balance indicate that the mass is higher that 693.5 and the scale is near but lower than 694, so the mass = 693.8.c

3 0

3 years ago

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What is the mass, in grams, of 7.20×1020 molecules of caffeine, c8h10n4o2?

pickupchik [31]

To determine the mass, you need to know the molecular weight of the c8h10n4o2 . The molecular weight of c8h10n4o2 would be: 8*12 + 10*1 + 4*14 + 2*16= 194g/mol.
To convert the number of molecules into moles, you need to divide it with 6.02 * 10^23. The calculation of the mass of c8h10n4o2 would be:
(7.20×10^20 molecules) /(6.02 * 10^23 molecule/mol) * 194g/mol= 232 * 10^-3 grams= 0.232 grams

3 0

3 years ago

Read 2 more answers