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3 years ago

Where are all metalloid found in this periodic table?

Chemistry

1 answer:

Montano1993 [528]3 years ago

7 0

Answer:

The answer is B. in green boxes

Explanation:

They seperate the metals and non-metals.

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Consider the following data for air trapped in a flask: Pressure = 0.988 atm Room Temperature = 23.5°C Volume of the flask = 1.0

ddd [48]

Answer:

total mass will be = = 1.207g

Explanation:

First what is given

Pressure P= 0.988 atm Room TemperatureT = 23.5°C= 296.5 K

Volume V= 1.042 L

Nitrogen in air is 80 % (moles number) = 0.8

Ideal gas constant R = 0.0821 L atmmol-1K-1

Given mass of N = 14.01 g/mol

Given mass of oxygen O = 16.00 g/mol

Total number of moles = ?

So first we have to find the total number of moles by using formula

Total number of moles

n = PV/ RT

adding the values

moles n= 0.988atm x 1.042L / (0.0821L-atm/mole-K x 296.6K)

= 1.0294 / 24.35

= 0.042 moles (total number of moles)

So by using Nitrogen percentage

Moles of nitrogen = total moles x 80/100

= 0.042moles x 0.8

So moles of O2= Total moles – moles of N2

= 0.042moles - 0.034moles

Moles of O2 = 0.008moles

Now for finding the mass of the N2 and oxygen

Mass of Nitrogen N2 = no of moles x molar mass

= 0.034 x 28

= 0.952 g

Mass of oxygen O2 = no of moles x molar mass

= 0.008 x 32

= 0.256 g

total mass will be = Mass of Nitrogen N2 + Mass of oxygen O2

=0.952 g + 0.256 g

=1.207g

6 0

3 years ago

A certain element forms an ion with 36 electrons and a charge of +2. identify the element

Dovator [93]

The answer is Strontium or Sr

Hoep this helps

6 0

3 years ago

Read 2 more answers

Baking soda has a pH of 8. Its a(n) _________ substance

Stolb23 [73]

Answer:

it's an acid

Explanation:

because itis soda

4 0

3 years ago

Two or more different elements chemically combined

fiasKO [112]

Answer:

This question lacks some parts, it should read "Two or more different elements chemically combined make up a"

The answer is a COMPOUND

Explanation:

A compound is a type of pure substance that is formed as a result of the chemical combination of two or more different elements. During this combination, the atoms of the constituent elements are chemically joined together by CHEMICAL BONDS.

An example of a compound is CaCO3, which contains the following elements: Calcium, Carbon and Oxygen. In this compound, the atoms of the above listed elements are joined together by chemical bonds to form a COMPOUND.

5 0

3 years ago

What is the concentration in molarity of S2O32- (aq) in a solution prepared by mixing 150 mLmL of 0.149 MM Na2S2O3 (aq) with eno

Artist 52 [7]

Answer:

0.0890 M

Explanation:

Since the concentration of KCl is irrelevant in this case, the concentration of Na2S2O3 can be determined using a simple dilution equation:

C1V1 = C2V2, where C1 = 0.149 M, V1 = 150 mL, V2 = 250 mL

C2 = 0.149 x 150/250

= 0.089 M

To determine the concentration of S2O32- (aq), consider the equation:

$Na_2S_2O_3 => 2Na^+_{(aq)} + S_2O^2^-_3_{(aq)}$

The concentration of Na2S2O3 and S2O32- (aq) is 1:1

Hence, the concentration in molarity of S2O32- (aq) is 0.089 M.

To 3 significant figures = 0.0890 M

7 0

3 years ago