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3 years ago

Which of the following is not an example of a molecule?

Chemistry

1 answer:

dybincka [34]3 years ago

4 0

Answer:

Explanation:

A molecule is the smallest physical unit of a substance that can exist independently, consisting of 2 or more atoms chemically combined

He is one atom of Helium

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Changing from liquid to gas is a chemical change. True False

Korolek [52]

Answer:

This is False

Explanation:

A chemical change is when the matter is completely changed.

When you have water and boil it to be a gas, it is still the same matter, just in a different form.

I hope this helps :)

6 0

3 years ago

Read 2 more answers

How does a calorimeter follow the Law of Conservation of Energy?

dusya [7]

It is based on the law of conservation of energy , which says that energy is neither created nor destroyed during a chemical reaction . I’m calorimeter , this means that the heat gained by the water in calorimeter must have been released by the sample or reaction taking place in the calorimeter .

4 0

4 years ago

Read 2 more answers

To make a 2 M solution of calcium chloride (CaCl2), you would place how many grams of CaCl2 into a container and then add how mu

belka [17]

Answer:

For a volume of 1 liter, we have a total mass of 220 grams of CaCl2 ( Option A)

Explanation:

Step 1: Given data

The concentration of the solution we want to make is 2M

2M = 2 moles/ L So the volume = 1L

The molar mass of CaCl2 is = 40 + 2*35 = 110g/mole

Step 2: Calculate number of moles

If we consider the volume = 1 L then for a concentration of 2M, this means the number of moles is 2

Step 3: Calculate mass

The molar mass of CaCl2 = 110 g/mole

This means 110 grams per 1 mole

for 2 moles the mass is 220 grams

This means that for a volume of 1 liter, we have a total mass of 220 grams of CaCl2

6 0

3 years ago

Why does oxygen have a higher electronegativity compared to chlorine?

bezimeni [28]

Answer:

The electronegativity of fluorine compare to the electronegativity of oxygen and chlorine as below

Explanation:

Fluorine has the highest electronegativity than oxygen, and chlorine.

Explanation

Generally the electronegativity increase across the period ( from the left to the right) and decreases down the group.

Both oxygen and fluorine are in period 2 in periodic table. since fluorine is on fur right side as compared to oxygen , fluorine has higher electronegativity than oxygen.

On the other side Fluorine and chlorine are in the same group in periodic table. fluorine is at the top of the group while chlorine is at the bottom therefore fluorine has higher electronegativity than chlorine.

6 0

3 years ago

Citric acid is a naturally occurring compound. what orbitals are used to form each indicated bond? be sure to answer all parts.2

Rina8888 [55]

Answer : The orbitals that are used to form each indicated bond in citric acid is given below as per the attachment.

Answer 1) σ Bond a : C has $SP^{2}$ O has $SP^{2}$ .

Explanation : The orbitals of oxygen and carbon which are involved in $SP^{2}$ hybridization to form sigma bonds. This is observed at 'a' position in the citric acid molecule.

Answer 2) π Bond a: C has π orbitals and O also has π orbitals.

Explanation : The pi-bond at the 'a'position has carbon and oxygen atoms which undergoes pi-bond formation. And has pi orbitals of oxygen and carbon involved in the bonding process.

Answer 3) Bond b: O $SP^{3}$ H has only S orbital involved in bonding.

Explanation : The bonding at 'b' position involves oxygen $SP^{3}$ hydrogen atoms in it. It has $SP^{3}$ hybridized orbitals and S orbital of hydrogen involved in the bonding.

Answer 4) Bond c: C is $SP^{3}$ O is also $SP^{3}$

Explanation : The bonding involved at 'c' position has carbon and oxygen atoms involved in it. Both the atoms involves the orbitals of $SP^{3}$ hybridized bonds.

Answer 5) Bond d: C atom has $SP^{3}$ C atom has $SP^{3}$

Explanation : At the position of 'd' the bonding between two carbon atoms is found to be $SP^{3}$ . Therefore, the orbitals that undergo $SP^{3}$ hybridization are $SP^{3}$ .

Answer 6) Bond e : C1 containing O $SP^{2}$

C2 is $SP^{3}$

Explanation : The carbon atom which contains oxygen along with a double bond has $SP^{2}$ hybridized orbitals involved in the bonding process; whereas the carbon at C2 has $SP^{3}$ hybridized orbitals involved during the bonding. This is for the 'e' position.

7 0

4 years ago