Atomic Reactivity, Chemical Formulas and Chemical Reactions

Atomic Reactivity, Chemical Formulas and Chemical Reactions

Multiple Choice

When determining an element's identity, what is the most important subatomic particle to examine?

• Electrons

• Neutrons

• Neutrinos

• Protons

Multiple Choice

An atom has 11 protons, 12 neutrons, and 11 electrons. What is the identity of the element?

• Magnesium

• Sodium

• Vanadium

• Titanium

Multiple Choice

Atoms of which two elements have a combined total of 23 protons?

• Sodium, Na and Magnesium, MG

• Boron, B, and carbon, C

• Copper, Cu, and zinc, Zn

• None of these

Multiple Choice

When determining an element's chemical properties, the most important particle to look at is -

• protons

• valence electrons

• neutrons

• all electrons

Multiple Choice

Which of the atom models above represents a reactive metal?

• Model A

• Model B

• Model C

• Model D

Multiple Choice

The most reactive metal is one with -

• 4 valence electrons

• 2 valence eletrons

• 3 valence electrons

• 1 valence electron

Multiple Choice

In this model, which particle determines the reactivtity of this atom?

• Particle W

• Particle X

• Particle Y

• Particle Z

Multiple Choice

Based on these, drawings, which element is the least reactive?

• Neon, because it has two energy levels with eight electron in the second level.

• Chlorine, because it has 3 energy levels with 7 electrons of the 3rd level.

• Gallium, because it has four energy levels with three electrons in the 4th level.

• Tin because it has five energy levels with four electrons in the fifth level.

Multiple Choice

According to the Chemical Compounds table, how many atoms of hydrogen are in Ethenol?

• 0

• 2

• 5

• 6

Multiple Choice

According to the Chemical Compounds table, how many total atoms are in Glucose?

• 3

• 18

• 24

• 432

Multiple Choice

How many atoms of each element are in one molecule of 2-heptanone?

• 6 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

• 7 carbon atoms, 14 hydrogen atoms, 1 oxygen atom

• 6 carbon atoms, 14 hydrogen atoms and 3 oxygen atoms

Multiple Choice

How many iron atoms are represented in the formula for iron oxide-hydroxide?

• 3

• 1

• 6

• 4

Multiple Choice

How many atoms of Oxygen are in the formula of oxide-hydroxide?

• 12

• 3

• 4

• 1

Multiple Choice

How many nitrogen atoms are present in the formula for diammonium hydrogen phosphate?

• 4

• 3

• 12

• 7

Multiple Choice

Which chemical reaction involves the fewest oxygen atoms?

• F

• G

• H

• J

Multiple Choice

How many oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?

• 2

• 4

• 3

• 6

Multiple Choice

During an investigation, students dropped a tarnished penny into a solution of acetic acid and sodium chloride. Tinu bubbles formed around the penny, and the penny was less tarnished in two minutes of soaking in the solution. The student inferred that a chemical reaction occurred. What evidence supports the student's inference?

• The penny experienced a color change, and a gas was produced.

• The penny experienced a color change and a precipitate formed.

• The penny experienced a color change and is in a new state of matter.

• The penny experienced a color change and produced light.

Multiple Choice

Based on their observations, can the student correctly conclude that a chemical reactionn occurred?

• No, because the metal strip was still visible.

• Yes, because a new material of a different color formed on part of the metal strip.

• No, becuase the solution stayed blue.

• Yes, because the volume of the blue solution stay the same.

Multiple Choice

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

• The water in the cake batter evaporates.

• The cake rises as gas bubbles from the baking cake.

• The cake takes the shape of the container is which it was baked.

• The water in the cake batter is used to keep the cake moist as it bakes.

Multiple Choice

• Procedure 1: All the reactants were liquids that evaporated.

  Procedure 2: A gas was formed as one product, and it escaped into the air

• Procedure 1: One of the reactants was converted to thermal energy.

  Procedure 2: All the products were liquids.

• Procedure 1: The reactants were liquids with different densities. Procedure 2: The reactants were combined into only one product.

• Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.