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4 years ago

Which properties doom metalloids share with metals

1 answer:

3 0

Metalloids are all solid at room temperature. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors. Silicon, for example, appears lustrous but is not malleable or ductile (it is brittle - a characteristic of some nonmetals).

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Hydrogen peroxide is a powerful oxidizing agent; it is used in concentrated solution in rocket fuel and in dilute solution in ha

Anestetic [448]

The molarity of the hydrogen peroxide solution from the information supplied in the question is 12.26 M.

Co = 10pd/M

Where;

Co = concentration = ?

p = percent of the hydrogen peroxide = 30%

d = Density of hydrogen peroxide = 1.39 g/ml

M = Molar mass = 34 g/mol

Substituting values;

Co = 10 × 30 × 1.39/34

Co = 12.26 M

The molarity of the hydrogen peroxide solution from the information supplied in the question is 12.26 M.

Learn more: brainly.com/question/6111443

4 0

3 years ago

If a proton has an uncertainty in its velocity of 5.00 * 10 4 m/s, what is

Rzqust [24]

pls give me a good rate cus i have no idea

7 0

3 years ago

The net ionic equation for the reaction between aqueous solutions of hf and koh is ________.

choli [55]

Answer:

The net ionic equation for the reaction between aqueous solutions of hf and koh is H⁺ + OH⁻ → H₂O (l)

Explanation:

This is the complete reaction:

HF (aq)+ KOH (aq) → KF (aq) + H₂O (l)

Hydrofluoric acid dissociates according to this equation:

HF → H⁺ + F⁻

And we get protons plus fluorides.

Sodium hydroxide dissociates into:

KOH → K⁺ + OH⁻

potassium cation and hydroxyls.

First of all, the aqueous compounds must be separated into their ions.

Aqueous are the only one, you can break apart.

Don't forget to establish solubility in the compounds. For this case no one is soluble in water.

We make the complete ionic equation with all the aqueous compounds:

H⁺ + F⁻ + K⁺ + OH⁻ → F⁻ + K⁺

and afterwards, cancel the ions that are repeat on reactant and product sides. This are the spectator ions.

As we eliminate F⁻ + K, the net ionic equation will be:

H⁺ + OH⁻ → H₂O (l)

7 0

3 years ago

The normal boiling point of methanol is 64.7Â°c and the molar enthalpy of vaporization if 71.8 kj/mol. the value of Î´s when 2.1

kvasek [131]

The value or amount of heat that is needed in order to vaporize the given amount of methanol (CH3OH) can be calculated through the equation,
H = (n)(hf)

where H is the amount of heat
n is the given amount in mol, and
hf is the molar heat of vaporization

Substituting the known values,

H = (2.15 mol CH3OH)(71.8 kJ/mol)
H = 154.37 kJ

ANSWER: 154.37 kJ

5 0

3 years ago

Read 2 more answers

One liter of a gas is in a sealed chamber containing a moveable piston. If the piston is moved so that the volume of the gas is

cricket20 [7]

Answer:

a) The pressure wiil be twice the original value

Explanation:

Pressure in inversely proportional to volume, that means; when one value decreases at the same rate that the other increases, if the temperature and amount of gas remain unchanged within a closed system. The above derived from the same definition of pressure. The pressure is defined as the crashes and frequency of the same agains surface of objects, if certain amount of gas is contained in a recipent, It will crash more times if the volume is minor. The Boyle´s law express this mathematically.

$P1V1= P2V2\\\\P2=\frac{P1V1}{V2} \\\\P2=\frac{P1*1L}{0.5L} \\\\P2=2P1\\\\\\where\\\\V1= 1L\\V2= 0.5L$

7 0

4 years ago