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shepuryov [24]
3 years ago
11

What is the first element of the periodic table?

Chemistry
2 answers:
Nikolay [14]3 years ago
7 0
The first element of the periodic table is Hydrogen. It is the only element that can achieve being stable without a full octet (8 valence electrons). 

Answer: Hydrogen 
Tpy6a [65]3 years ago
3 0
Hyrdrogen.
I hope this helps;)
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The anion of which element has a -1 charge? Iodine Strontium Silver or Xenon
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Iodine Strontium Silver......           ..I think.
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What does conserving mass mean in a chemical equation?
expeople1 [14]
The correct answer should be letter choice C) There is an equal number of each type of atom on the reactant and product side. Its C) because if its trying to conserve mass, than that means save or be equally balanced so it should be even for both sides.


7 0
4 years ago
Which particle has the least mass? Proton, a helium atom, electron, hydrogen atom
Tpy6a [65]

Answer:electron

Explanation:

3 0
3 years ago
The pressure in a car tire is 178 kPa at 37°C. After a long drive, the pressure is 275 kPa. What is
dimaraw [331]

Answer:

T₂ = 478.93 K

Explanation:

Given that,

Initial pressure, P₁ = 178 kPa

Initial temperature, T₁ = 37°C = 310 K

Final pressure, P₂ = 275 kPa

We need to find the new temp of the air in the tire, assuming the volume is constant. We know that,

\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\T_2=\dfrac{P_2T_1}{P_1}\\\\T_2=\dfrac{275\times 310}{178}\\\\T_2=478.93 K

So, the new temperature is equal to 478.93 K.

3 0
3 years ago
A dehydration reaction starting with 3.8 g cyclohexanol produces 2.6 g cyclohexene. Calculate the theoretical yield for this rea
diamong [38]

Answer:

Theoretical yield of C6H10 = 3.2 g.

Explanation:

Defining Theoretical yield as the quantity of product obtained from the complete conversion of the limiting reactant in a chemical reaction. It can be expressed as grams or moles.

Equation of the reaction

C6H11OH --> C6H10 + H2O

Moles of C6H11OH:

Molar mass of C6H110H = (12*6) + (1*12) + 16

= 100 g/mol

Mass of C6H10 = 3.8 g

number of moles = mass/molar mass

=3.8/100

= 0.038 mol.

Using stoichoimetry, 1 moles of C6H110H was dehydrated to form 1 mole of C6H10 and 1 mole of water.

Therefore, 0.038 moles of C6H10 was produced.

Mass of C6H10 = molar mass * number of moles

Molar mass of C6H10 = (12*6) + (1*10)

= 82 g/mol.

Mass = 82 * 0.038

= 3.116 g of C6H10.

Theoretical yield of C6H10 = 3.2 g

4 0
4 years ago
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