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otez555 [7]
4 years ago
9

What is the first ten elements of the periodic table?

Chemistry
1 answer:
Debora [2.8K]4 years ago
5 0
1. hydrogen, 2. helium, 3. lithium, 4. beryllium, 5. boron, 6. carbon, 7. nitrogen, 8. oxygen, 9. fluorine, 10. neon
You might be interested in
Calculate the quantity of electricity obtained from 2 moles of electrons​
Vinil7 [7]

The quantity of electricity : 2 Faraday = 193000 Coulomb

<h3>Further explanation</h3>

Given

2 moles of electrons

Required

The quantity of electricity

Solution

According to Faraday, the amount of current flowing in the electrolysis cell is closely related to the amount of substance that reacts

1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons. 1 mole of electrons is equivalent to an electric charge of 96500 Coulombs.

The conversion / relationship can be stated as follows:

1 Faraday = 1 mole of electrons = 96500 Coulombs

1 faraday = coulomb / 96500

Can be formulated

Coulomb = Q = I. t so:

\large {\boxed {\bold {1 \: Faraday \: = \: \dfrac {i \: x \: t} {96500}}}}

so for 2 moles electrons :

= 2 x 96500 C

= 193000 C

= 2 Faraday

6 0
3 years ago
PLEASE URGENT I will give MOST POINTS POSSIBLE For the following reactions, (a) write the balanced reaction equations and (b) ID
Tema [17]

Answer:

see below

Explanation:

Aqueous hydroiodic acid reacts with liquid water in a reversible reaction.

2 HI  +  2 H₂O  ⇔  2 H₃O  +  I₂

This is an acid-base reaction.  HI is the acid, and H₂O is the base.  The conjugate acid is H₃O, and the conjugate base is I₂.  You can figure out the acid and base by a using a table of strong/weak acids and bases.  The conjugate will have one less or one more H⁺ depending on if it's an acid or a base.

The expression for Kₐ of the reaction is below.  You have to put the acid and its conjugate base on the top and the base and its conjugate on the bottom.  I didn't put in H₂O since, although it is the base in this equation, it isn't really a base.

K_{a}=\frac{[HI][H_{3}O] }{[I_{2}] }

Solid zinc reacts with solid manganese (IV) oxide producing solid zinc oxide and solid manganese (III) oxide.

Zn  +  2 MnO₂  ⇒  ZnO  +  Mn₂O₃

This is a redox reaction.  The Zn is being oxidized, and the Mn is being reduced.

Oxidation:    Zn  ⇒  Zn⁺²  +  2 e⁻

Reduction:   Mn⁺⁴  +  e⁻  ⇒  Mn⁺³

Aqueous silver nitrate reacts with aqueous calcium chloride.

2 AgNO₃  +  CaCl₂  ⇒  2 AgCl  +  Ca(NO₃)₂

This is a precipitation reaction.  You have two soluble salts combing to form a solution.  You now need to figure out which of the compounds produced are not soluble.  AgCl is the compound that is not soluble in water, making it the precipitate.

I think I covered everything.  If I missed something let me know.

8 0
3 years ago
The most common element in the atmosphere are
Ivanshal [37]
Nitrogen and oxygen are the most prevalent in the atmosphere.
8 0
4 years ago
How does natural selection change the traits of living things over long periods of time? *
WARRIOR [948]
The answer for this one is C . Organisms are always changing traits
8 0
3 years ago
Read 2 more answers
Consider the reaction for the combustion of benzene: 2 C6H6(g) 15 O2(g) ---&gt; 12 CO2(g) 6 H2O(l) What mass of H2O is produced
irakobra [83]

Answer: Mass of water produced is 17.3 grams

Explanation:

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

For benzene:

Given mass of benzene = 25.0 g

Molar mass of benzene= 78 g/mol

Putting values in equation 1, we get:

\text{Moles of benzene}=\frac{25.0g}{78g/mol}=0.32mol

The chemical equation for the reaction follows:

2C_6H_6(g)+15O_2(g)\rightarrow 12CO_2(g)+6H_2O(l)

As, oxygen is an excess reagent. Thus benzene is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of benzene produces 6 moles of water

So, 0.32 moles of benzene will produce = \frac{6}{2}\times 0.32=0.96moles of water

Now, calculating the mass of water from equation 1, we get:

Molar mass of water= 18 g/mol

Moles of water = 0.96moles

Putting values in equation 1, we get:

0.96mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=17.3g

Thus mass of water produced is 17.3 grams

3 0
3 years ago
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