Question

name: dalton spicer
date:
i pledge:

1. list the four major elements needed in the human body

carbon, oxygen, hydrogen, nitrogen

1. elements that are required in only very small amounts and are essential for life?

a. protons
b. electrons
c. trace elements
d. neutron

1. what subatomic particles are involved in chemical reactions

a. protons
b. electrons
c. trace elements
d. neutron

1. electrons are negatively charged, neutrons are neutral charged, protons are positively charged (positively, neutral, negative).
2. the ability of water to stick to other things is called

a. cohesion
b. surface tension
c. adhesion
d. polarity

1. what kind of bonds are formed between oppositely charged ions

a. ionic
b. covalent
c. hydrogen
d. metallic

1. what property of water allows the insect to the right to float on it

a. adhesion
b. polarity
c. surface tension
d. cohesion

Explanation:

1. The four major elements in the human body are carbon (C), oxygen (O), hydrogen (H), and nitrogen (N). These are fundamental for biological molecules like carbohydrates, proteins, lipids, and nucleic acids.
2. Trace elements are required in small amounts but are essential for life. Protons, electrons, and neutrons are sub - atomic particles, not elements.
3. Electrons are involved in chemical reactions as they are shared or transferred between atoms to form bonds. Protons and neutrons are in the nucleus and not directly involved in most chemical reactions.
4. Electrons have a negative charge, neutrons are neutral (no charge), and protons have a positive charge. This is a basic property of sub - atomic particles.
5. Adhesion is the ability of water to stick to other substances. Cohesion is water sticking to water, surface tension is related to the 'skin' - like property of water due to cohesion, and polarity is a property of water molecules (having positive and negative ends).
6. Ionic bonds are formed between oppositely charged ions. Covalent bonds involve sharing of electrons, hydrogen bonds are weaker attractions between polar molecules, and metallic bonds are in metals.
7. Surface tension, due to the cohesive forces between water molecules, allows insects to float on water. Adhesion is water - other substance sticking, polarity is a molecular property, and cohesion (water - water sticking) contributes to surface tension but the direct property here is surface tension.

Answer:

1. Carbon, Oxygen, Hydrogen, Nitrogen
2. C. Trace elements
3. b. Electrons
4. Electrons are negative charged, Neutrons are neutral charged, protons are positive charged
5. c. Adhesion
6. a. Ionic
7. c. Surface tension