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3 years ago

Which element in group 16 has the greatest metallic character?

1 answer:

5 0

The oxygen family, also called the chalcogens, consists of the elements found in Group 16 of the periodic table and is considered among the main group elements. It consists of the elements oxygen, sulfur, selenium, tellurium and polonium.

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Two atoms of the same substance wi the different numbers of neutrons are called what

sattari [20]

They are called ISOTOPES.
:)

4 0

3 years ago

What is the difference in concentration between a pH of 7 and 12?

Ratling [72]

Answer:

The pH of a solution is simply a measure of the concentration of hydrogen ions,

, which you'll often see referred to as hydronium cations,

More specifically, the pH of the solution is calculated using the negative log base

of the concentration of the hydronium cations.

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

−

log

(

[

]

)

∣

−−−−−−−−−−−−−−−−−−−−−−−−

Now, we use the negative log base

because the concentration of hydronium cations is usually significantly smaller than

As you know, every increase in the value of a log function corresponds to one order of magnitude.

Explanation:

4 0

3 years ago

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The amount of thermal energy stored in an object depends on what

Snowcat [4.5K]

Answer:

The amount of thermal energy stored in an object depends on three things.

The mass of the object.
The temperature of the object.
The amount of energy that the particular material stores per degree of temperature.

3 0

3 years ago

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A 33.0 mL sample of 1.15 M KBr and a 59.0 mL sample of 0.660 M KBr are mixed. The solution is then heated to evaporate water unt

Oksi-84 [34.3K]

Answer:

We need 13.06 grams of silver nitrate to precipitate out silver bromide in the final solution

Explanation:

Step 1: Data given

Sample 1: The 1.15 M sample has a volume of 33.O mL

Sample 2: The 0.660 M sample has a volume of 59.0 mL

Molar mass of KBr = 119 g/mol

Molar mass of AgNO3 = 169.87 g/mol

Step 2: Calculate number of moles for both samples

Number of moles = Molarity * Volume

Sample 1: 1.15 M * 33 *10^-3 L = 0.03795 moles

Sample 2: 0.660 M *59*10^-3 L = 0.03894 moles

Total mol KBr = 0.03795 + 0.03894 = 0.07689 moles

Step 3: Calculate total mass

mass = Number of moles * Molar mass

mass = 0.07689 moles * 119 g/moles = 9.15 grams ( in 55mL)

Step 4: Calculate moles of AgBr

AgNO3 reacts with KBr

KBr(aq) + AgNO3(aq) → AgBr(s) + KNO3(aq)

1 mole of KBr consumed, needs 1 mole of AgNO3 to produce 1 mole of AgBr and 1 mole of KNO3

So 0.07689 moles of KBr wll need 0.07689 moles of AgNO3

Step 5: Calculate mass of silver nitrate

mass of AgNO3 = Moles of AgNO3 * Molar mass of AgNO3

mass of AgNO3 = 0.07689 moles * 169.87 g/mol = 13.06 grams

We need 13.06 grams of silver nitrate to precipitate out silver bromide in the final solution

8 0

3 years ago

What would be the greatest difference in using an open ceramic coffee mug rather than an insulated mug with a lid as a calorimet

adoni [48]

The answer is number 4 or the exchange of energy with the surroundings. Calorimetry is a measurement of energy that is formed or absorbed in a certain process. The calorimeter is the instrument used in order to measure the energy. It is recommended that a calorimeter should be a closed system so as to measure precisely the energy and avoid or lessen the exchange of energy with the surroundings. Thus, comparing an open ceramic mug and an insulated mug with a lid, the greatest difference is the energy lost to the surroundings.

4 0

3 years ago

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