Elements, Atoms And Bonding RHO Quiz

2.

Identify the scientist who found that atoms contain negatively charged particles and reasoned that because atoms must be neutral, an atom needs to contain some positive charge. This scientist thought that the negatively charged particles would be scattered throughout a ball of positive charge. The negatively charged particles later became known as electrons.

Thomson
Chadwick
Dalton
Rutherford
Bohr

Correct Answer

A. Thomson

3.

Elements are called building blocks of matter because:

All matter is composed of one element or a combination of two of more elements.
All elements are made of molecules.
All matter is made of hydrogen.
All matter is composed of two or more elements in a specific ratio.

Correct Answer

A. All matter is composed of one element or a combination of two of more elements.

4.

In 430 b.c. ancient Greece, a philosopher named Democritus proposed the idea that matter is made up of very small pieces that are "uncuttable" into smaller parts and still be that element. It took 2000 years until Democritus' idea was accepted. These small "uncuttable" pieces are called:

Atoms
Molecules
Ions
Elements

Correct Answer

A. Atoms

5.

What is the difference between a compound and a mixture?

A compound is a pure substance made up of two or more elements that are combined chemically in a specific ratio. A mixture is two or more substances that are in the same place and are not chemically combined.
A mixture is a pure substance made up of two or more elements that are combined chemically in a specific ratio. A compound is two or more substances that are in the same place and are not chemically combined.
A compound is a mixture made up of two or more elements that are chemically combined. A mixture is a combination of two or more substances that occupy the same place.
A compound is set of element that are blended but not chemically combined. A mixture is made up of emulsifiers.

Correct Answer

A. A compound is a pure substance made up of two or more elements that are combined chemically in a specific ratio. A mixture is two or more substances that are in the same place and are not chemically combined.

6.

This scientist discovered another particle in the nucleus of an atoms. The discovery completed the modern atomic model. This particle was hard to detect because it does not have an electrical charge even though it has nearly the same mass as a proton. Because the particle had no electrical charge it was called a neutron.

Chadwick
Bohr
Thomson
Rutherford
Dalton

Correct Answer

A. Chadwick

7.

A compound is different from an element because a compound is:

Made of two or more elements chemically combined.
The building block of all matter.
A mixture of elements.
A pure substance.

Correct Answer

A. Made of two or more elements chemically combined.

8.

All the atoms of a single element have the same number of protons. Different elements have different number of _______________

Protons
Neutrons
Electrons
Nucleus

Correct Answer

A. Protons

9.

Which of the following is not a mixture?

Oxygen
Air
Soil
Orange juice

Correct Answer

A. Oxygen

10.

Identify the scientist who revised earlier models to show that electrons could only have a specific amount of energy and move in certain orbits. The electron orbits resemble planet orbits or layers of an onion.

Bohr
Dalton
Chadwick
Thomson
Rutherford

Correct Answer

A. Bohr

11.

What was important about Rutherford's gold foil experiment?

Rutherford's team of scientists aimed a beam of positively charged particles at a thin sheet of gold foil. They predicted that the charged particles would pass right through the foil in a straight line. The gold atoms in the foil would not have enough positive charge in any given area to repel the charged particles. The scientists observed that MOST of the particles passed through the foil undisturbed, as expected. A few particles strongly deflected in another direction. Since charges that are alike repel each other, Rutherford inferred that an atom's positive charge must be clustered in a tiny area in its center. Because of this experiment, Rutherford test showed evidence that the beam particles were repelled by the gold atom's center or nucleus.
Rutherford's team of scientists aimed a beam of negatively charged particles at a thin sheet of gold foil. They predicted that the charged particles would pass right through the foil in a straight line. The gold atoms in the foil would not have enough positive charge in any given area to repel the charged particles. The scientists observed that MOST of the particles passed through the foil undisturbed, as expected. A few particles strongly deflected in another direction. Since charges that are alike repel each other, Rutherford inferred that an atom's negative charge must be clustered in a tiny area in its center. Because of this experiment, Rutherford test showed evidence that the beam particles were repelled by the gold atom's center or nucleus.
Rutherford's team of scientists aimed a beam of positively charged particles at a thin sheet of gold foil. They predicted that the charged particles would pass right through the foil in a straight line. The gold atoms in the foil would not have enough positive charge in any given area to repel the charged particles. The scientists observed that MOST of the particles passed through the foil undisturbed, as expected. A few particles strongly deflected in another direction. Since charges that are alike repel each other, Rutherford inferred that an atom's positive charge must be clustered in a tiny area in its center. Because of this experiment, Rutherford test showed evidence that the beam particles were repelled by the gold atom's center or valence.
Rutherford's team of scientists aimed a beam of positively charged particles at a thin sheet of gold foil. They predicted that the negative charged particles would pass right through the foil in a straight line. The gold atoms in the foil would not have enough negative charge in any given area to repel the charged particles. The scientists observed that MOST of the particles passed through the foil undisturbed, as expected. A few particles strongly deflected in another direction. Since charges that are alike repel each other, Rutherford inferred that an atom's positive charge must be clustered in a tiny area in its center. Because of this experiment, Rutherford test showed evidence that the beam particles were repelled by the gold atom's center or nucleus.

Correct Answer

A. Rutherford's team of scientists aimed a beam of positively charged particles at a thin sheet of gold foil. They predicted that the charged particles would pass right through the foil in a straight line. The gold atoms in the foil would not have enough positive charge in any given area to repel the charged particles. The scientists observed that MOST of the particles passed through the foil undisturbed, as expected. A few particles strongly deflected in another direction. Since charges that are alike repel each other, Rutherford inferred that an atom's positive charge must be clustered in a tiny area in its center. Because of this experiment, Rutherford test showed evidence that the beam particles were repelled by the gold atom's center or nucleus.

12.

Identify the scientist who theorized the atom to be made up of mostly empty space with electrons moving around a small positively charged nucleus in the center of the atom. This scientist named the positively charged particles in the nucleus protons.

Rutherford
Thomson
Bohr
Dalton
Chadwick

Correct Answer

A. Rutherford

13.

Identify which statement is NOT part of John Dalton's atomic theory:

Atoms have no overall electrical charge because each atom has the same number of electrons as protons.
All atoms of the same element are exactly alike and have the same mass. Atoms of different elements are different and have different masses.
An atom of one element cannot be changed into an atom of a different element. Atoms cannot be created or destroyed in any chemical change, only rearranged.
Every compound is composed of atoms of different elements combined in a specific ratio.
All elements are composed of atoms that cannot be divided.

Correct Answer

A. Atoms have no overall electrical charge because each atom has the same number of electrons as protons.

Elements, Atoms And Bonding Rho Quiz

Identify the scientist who contributed the basics of the atomic theory that is still accepted today.

Quiz Preview

Elements are called building blocks of matter because:

In 430 b.c. ancient Greece, a philosopher named Democritus proposed the idea that matter is made up of very small pieces that are "uncuttable" into smaller parts and still be that element. It took 2000 years until Democritus' idea was accepted. These small "uncuttable" pieces are called:

What is the difference between a compound and a mixture?

A compound is different from an element because a compound is:

All the atoms of a single element have the same number of protons. Different elements have different number of _______________

Which of the following is not a mixture?

Identify the scientist who revised earlier models to show that electrons could only have a specific amount of energy and move in certain orbits. The electron orbits resemble planet orbits or layers of an onion.

What was important about Rutherford's gold foil experiment?

Identify the scientist who theorized the atom to be made up of mostly empty space with electrons moving around a small positively charged nucleus in the center of the atom. This scientist named the positively charged particles in the nucleus protons.

Identify which statement is NOT part of John Dalton's atomic theory: