Chemistry Finals Review Part I

 Which of the following is NOT a part of Dalton’s atomic theory?

• All elements are composed of atoms.
•  Atoms of the same element are alike.
•   Atoms are always in motion.
•  Atoms that combine do so in simple whole-number ratios.

Tags

NGSS.HS-PS1-7

 Robert A. Millikan contributed to the current atomic theory by discovering which of the following? I.  electron charge II.  the electron III.  the mass of an electron

•    I and II
•      II and III
•  I and III
•    I, II, and III

Bohr’s contribution to the development of atomic structure

•    was referred to as the “plum pudding model.”
•    was the discovery that electrons surround a dense nucleus.
•    proposed that electrons travel in circular orbits around the nucleus.
•  is the quantum mechanical model.

What is the total number of subatomic particles (protons, electrons, and neutrons) in an atom of vanadium-51?

• 51
• 74
• 102
• 125

 Which of these statements is false?

• Electrons have a negative charge.
• Electrons have a mass of 1 amu.
•    The nucleus of an atom is positively charged.
•    Neutrons are found in the nucleus of an atom.

Tags

NGSS.MS-PS1-1

 What is the atomic number and the mass number of an atom with 11 protons and 12 neutrons?

•  atomic number = 11 and mass number = 12
•    atomic number = 12 and mass number = 11
•  atomic number = 11 and mass number = 23
•    atomic number = 23 and mass number = 12

Tags

NGSS.MS-PS1-1

 Name the elements that form the compound NaSO₄.

•  nitrogen, sulfur, oxygen
•  sodium, sulfur, oxygen
•  neon, silver, oxygen
•  sodium, silver, oxygen

Tags

NGSS.MS-PS1-1

The configuration for the outermost energy level in Ca is

•  3s².
• 4s²
•  2s¹.
•  4s¹.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following examples in nature represents a chemical change?

• water freezing
•    a tree branch breaking
•  autumn leaves changing colors
•    steam rising from hot pavement

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

 A lab student places some sodium hydroxide solution into a test tube and adds a drop of phenolphthalein solution to it. Both sodium hydroxide and phenolphthalein are colorless, yet when mixed together, the solution turns pink. What has occurred?

•  heterogeneous mixture
•  a chemical change
•  the formation of a solid
•    a physical change

Tags

NGSS.HS-PS1-2