1. A carbon atom can form up to four covalent bonds. A. True
B. False
2. A carbon atom has six electrons in its outermost shell.
A. True
B. False
3. The bond between a carbon and hydrogen atom is a polar bond.
A. True
B. False
4. Oxygen and nitrogen have a stronger electronegativity than carbon (e. g., a strong pull on a shared electron).
A. True
B. False
5. Bonds between carbon and other atoms are relatively unstable and readily dissociate, resulting in the formation of new molecules.
A. True
B. False
6. The carbon backbone of a molecule is made up of a string of carbon atoms held together with either single or double bonds.
A. True
B. False
7. The carbon backbone of a molecule comes in a variety of shapes: linear, ring-like, or highly branched.
A. True
B. False
8. Carbon is a relatively large atom allowing it to bind to more atoms than smaller atoms would, thereby making it more versatile.
A. True
B. False

Explanation:

Carbon is a non- metallic element with tetravalent, which means carbon posses four electrons which is available to form covalent chemical bonds. it is a chemical element with chemical symbol "C" , it has atomic number of 6, and it is categorized as a member of group 14 in the periodic table. It can form up to 4 covalent bonds, in term of electronegativity, non- metal like Oxygen and nitrogen have a stronger electronegativity compared to carbon which means there is a strong pull on a shared electron. The carbon backbone of a molecule is made up of a string of carbon atoms held together with either single or double bonds.

1)A carbon atom can form up to four covalent bonds.

A. True

2. A carbon atom has six electrons in its outermost shell.

B. False

3. The bond between a carbon and hydrogen atom is a polar bond.

B. False

4. Oxygen and nitrogen have a stronger electronegativity than carbon (e.g., a strong pull on a shared electron).

A. True

5. Bonds between carbon and other atoms are relatively unstable and readily dissociate, resulting in the formation of new molecules.

B. False

6. The carbon backbone of a molecule is made up of a string of carbon atoms held together with either single or double bonds.

A. True

7. The carbon backbone of a molecule comes in a variety of shapes: linear, ring-like, or highly branched.

A. True

8. Carbon is a relatively large atom allowing it to bind to more atoms than smaller atoms would, thereby making it more versatile.

B. False

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.