Fb Chapter 2: The Chemistry Of Life: The Study Of Life

1. What are the characteristics of matter?

Visible; intangible

Energy; light

Liquid; gaseous

Occupies space; has mass

Matter is defined by occupying space and having mass, making it tangible and taking up physical space.

Explanation

Matter is defined by occupying space and having mass, making it tangible and taking up physical space.

2. What is mass?

The density of an object.

The force exerted on an object due to gravity.

The speed at which an object is moving.

Similar to weight; the amount of matter that an object represent

The volume of an object.

Mass is a measure of the amount of matter in an object and is often confused with weight, which is the force exerted on an object due to gravity. It is not the volume, speed, or density of an object.

Explanation

Mass is a measure of the amount of matter in an object and is often confused with weight, which is the force exerted on an object due to gravity. It is not the volume, speed, or density of an object.

3. What is weight?

The amount of matter in an object

The force exerted by an object on another object

The measurement of the force acting on an object

The effect of gravity on mass

Weight is a measure of the force of gravity acting on an object's mass. It is not the same as the mass of the object itself, which refers to the amount of matter in the object.

Explanation

Weight is a measure of the force of gravity acting on an object's mass. It is not the same as the mass of the object itself, which refers to the amount of matter in the object.

4. Which of the following characteristics best describes an element?

Has a fixed melting point

Can be easily dissolved in water

Can NOT be broken down by normal chemical reactions

Exists in multiple physical states at room temperature

Elements are substances that cannot be broken down into simpler substances by normal chemical reactions. This is known as one of the defining characteristics of an element.

Explanation

Elements are substances that cannot be broken down into simpler substances by normal chemical reactions. This is known as one of the defining characteristics of an element.

5. Is molecular oxygen and hydrogen considered a compound?

No- a compound is two or more elements

Yes- because it is a mixture of oxygen and hydrogen.

No- because oxygen and hydrogen are both gases.

Yes- since it contains two different elements.

A compound is defined as a substance composed of two or more elements chemically combined. Oxygen and hydrogen, in their molecular form (O2 and H2) are not chemically combined but rather mixtures of the same element, making them not compounds.

Explanation

A compound is defined as a substance composed of two or more elements chemically combined. Oxygen and hydrogen, in their molecular form (O2 and H2) are not chemically combined but rather mixtures of the same element, making them not compounds.

6. What is a mixture?

A chemical reaction between elements and compounds.

Forces that hold molecules together in a compound.

A pure substance made up of only one type of element.

Elements or compounds mixed but without chemical reaction

A mixture refers to a combination of elements or compounds that are physically mixed together without undergoing a chemical reaction. It is important to differentiate between mixtures and compounds, where compounds are substances composed of two or more elements that are chemically combined in fixed proportions.

Explanation

A mixture refers to a combination of elements or compounds that are physically mixed together without undergoing a chemical reaction. It is important to differentiate between mixtures and compounds, where compounds are substances composed of two or more elements that are chemically combined in fixed proportions.

7. What is an atom?

A type of fish found in the ocean.

A type of currency used in ancient civilizations.

A unit of time measurement.

A fundamental unit of matter

An atom is the smallest unit of a chemical element that retains the properties of that element. It consists of a nucleus containing protons and neutrons, surrounded by electrons.

Explanation

An atom is the smallest unit of a chemical element that retains the properties of that element. It consists of a nucleus containing protons and neutrons, surrounded by electrons.

8. What are subatomic particles?

Particles larger than atoms.

What is inside an atom

Particles found outside of atoms.

Particles that make up molecules.

Subatomic particles are the building blocks of atoms, not molecules.

Explanation

Subatomic particles are the building blocks of atoms, not molecules.

9. Which elements are the most important in biological systems?

Fe Iron 26

S Sulfur 16

A Aluminum

C Carbon 6
H Hydrogen 1
N Nitrogen 7
O Oxygen 8

Carbon, Hydrogen, Nitrogen, and Oxygen are the primary elements found in biological systems, forming the building blocks for various biological molecules essential for life.

Explanation

Carbon, Hydrogen, Nitrogen, and Oxygen are the primary elements found in biological systems, forming the building blocks for various biological molecules essential for life.

10. What is the structure of an atom?

Atoms are composed of only electrons and protons.

The inside of the atom has shells, electrons, protons and neutrons

Atoms are solid spheres with no internal structure.

The inside of an atom consists of electrons, neutrons, and photons.

An atom consists of a nucleus made up of protons and neutrons surrounded by shells of electrons. This is the basic structure of an atom.

Explanation

An atom consists of a nucleus made up of protons and neutrons surrounded by shells of electrons. This is the basic structure of an atom.

11. What does Atomic Number represent?

The mass of the atom.

The number of protons in the nucleus

The total number of particles in the nucleus.

The number of neutrons in the nucleus.

The atomic number is specifically defined as the number of protons in the nucleus of an atom. It determines the identity of an element and its place on the periodic table.

Explanation

The atomic number is specifically defined as the number of protons in the nucleus of an atom. It determines the identity of an element and its place on the periodic table.

12. What does Atomic Weight represent?

The number of electrons in the atom.

The number of protons+ the number of neutrons in the nucleus of the atom

The mass of the electrons in the atom.

The total number of particles in the atom.

Atomic weight is the sum of the number of protons and neutrons in the nucleus, not the total number of particles or the mass of electrons.

Explanation

Atomic weight is the sum of the number of protons and neutrons in the nucleus, not the total number of particles or the mass of electrons.