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Crank
3 years ago
14

Use the patterns you identified to estimate the likely melting point for potassium (K) in Group 1 and barium (Ba) in Group 2. En

ter your estimate in the figure. Explain your reasoning
Chemistry
1 answer:
posledela3 years ago
7 0

The melting point for potassium (K) is 63.5 °C whereas melting point of barium (Ba) is 727 °C.

<h3>Reason for high melting point</h3>

The melting point of barium is higher than potassium because of the presence of metallic bonding in the giant structure of a barium metal is very strong. These metallic bonds requires large amounts of energy for breaking.

While on the other hand, potassium has large atomic size than barium so the melting of potassium is lower than barium so we can conclude that melting point of potassium is lower than barium atom.

Learn more about melting point here: brainly.com/question/40140

Learn more: brainly.com/question/26195266

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Select true or false: substitute natural gas can be synthesized by passing carbon monoxide and hydrogen over ni or co at 400°c.
Paha777 [63]
This statement is "False".
Synthetic natural gas is usually created from coal. This gas acts as a substitute to natural gas. It must contain at least 95% methane. The intermediate step of creating synthetic gas is known as the synthesis gas production which is done through steps of gasification (using carbon and oxygen) followed by reactions of water gas shift and methanation (using carbon monoxide and steam)

3 0
3 years ago
A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder? 4. 01 × 1022 molecu
Over [174]

The number of molecules on 1 mole of oxygen has been 6.023\;\times\;10^2^3 molecules. Thus, option B is correct.

The molecule has been the smallest unit of the compound. It has been the repeating unit to form the compound.

The molecule has been formed with the combination of the elements in the fixed proportion.

<h3>Number of molecules in a mole</h3>

The number of molecules in a mole of sample has been given by Avogadro's law. According to this, the number of molecules in a mole of sample has been equivalent to the Avogadro number.

The value of Avogadro number has been 6.023\;\times\;10^2^3.

Thus, the one mole of sample has been consisted of 6.023\;\times\;10^2^3 molecules.

The number of molecules on 1 mole of oxygen has been 6.023\;\times\;10^2^3 molecules. Thus, option B is correct.

Learn more about molecules, here:

brainly.com/question/19556990

5 0
2 years ago
Which of the following pairs of atoms exhibit an ionic bond?
katen-ka-za [31]
Fe & O makes an ionic bond because of this 
Metal and Metal = Metallic
Non-Metal and Metal = Ionic
Non-Metal and Non-Metal = Covalent
In this case Oxygen (O) is a Non-Metal and Iron (Fe) is a Metal so you have an Ionic Bond
5 0
4 years ago
Read 2 more answers
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4?
nekit [7.7K]

Answer:

18.33 ×10²³ atoms

Explanation:

Given data:

Molar mass of sulfuric acid = 98.1 g/mol

Mass of sulfuric acid = 75.0 g

Number of of oxygen atom present = ?

Solution:

Number of moles of sulfuric acid:

Number of moles = mass/molar mass

Number of moles = 75.0 g/ 98.1 g/mol

Number of moles =0.761 mol

one mole of  sulfuric acid  contain four mole of oxygen atom.

0.761 mol × 4 = 3.044 mol

1 mole = 6.022×10²³ atoms of oxygen

3.044 mol ×  6.022×10²³ atoms of oxygen / 1mol

18.33 ×10²³ atoms

3 0
3 years ago
Which of these is found in the energy levels of an atom?
Paul [167]

Answer:

Electrons

Explanation:

Because the nucleas is In the middle and the Electrons surround it

3 0
3 years ago
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