Question 1

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

Accepted Answer

Arsenic (As)

Answer

Silicon (Si)

Answer

Sulfur (S)

Answer

Nitrogen (N)

Question 2

A model of an atom is shown below. An atom of which element is represented by this model?

Accepted Answer

Boron (B)

Answer

Sodium (Na)

Answer

Neon (Ne)

Answer

Carbon (C)

Question 3

Which of the following best describes an electron?

Accepted Answer

It has a negative charge and much less mass than a proton.

Answer

It has a positive charge and much more mass than a neutron.

Answer

It has a negative charge and about the same mass as a neutron.

Answer

It has no charge and about the same mass as a proton.

Question 4

A scientist spilled a few drops of dilute hydrochloric acid ($HCl$) on a lab table. For safety purposes, the scientist sprinkled some baking soda ($NaHCO_{3}$) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

Accepted Answer

The baking soda and hydrochloric acid combined, and bubbles formed.

Answer

The baking soda absorbed the hydrochloric acid.

Answer

The hydrochloric acid evaporated, leaving only the baking soda.

Answer

Some of the baking soda dissolved in the hydrochloric acid.

Question 5

Which information could a student determine from only the chemical formula of a protein?

Accepted Answer

The number of atoms of each element in the protein

Answer

The physical arrangement of atoms in the structure of the protein

Answer

The color of the protein

Answer

The number of molecules in each sequence that makes up a protein

Question 6

A teacher asks a student to write the chemical equation for photosynthesis. The student’s response is shown below. The equation is not balanced correctly. Which of these is a balanced equation for photosynthesis?

Accepted Answer

#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/D.png

Answer

#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/C.png

Answer

#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/A.png

Answer

#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/B.png

Question 7

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

Accepted Answer

The number of valence electrons in the unknown element

Answer

The total number of particles in the nucleus of the unknown element

Answer

The number of protons in the nucleus of the unknown element

Answer

The total number of neutrons in the unknown element

Question 8

The model of the periodic table below shows the locations of four elements. A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?

Accepted Answer

3

Answer

2

Answer

4

Answer

1

Question 9

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?

Accepted Answer

25

Answer

30

Answer

−25

Answer

−30

Question 10

How many atoms of oxygen are in a molecule of glucose ($C_{6}H_{12}O_{6}$)? Be sure to use the correct place value.

Accepted Answer

6

Question 11

During an investigation, a student combined the two clear, colorless solutions shown below. The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

Accepted Answer

The solutions reacted chemically.

Answer

Some of the water froze into ice crystals

Answer

One of the original compounds came out of solution

Answer

Rapid evaporation of water occurred, leaving a solid.

Question 12

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

Accepted Answer

A new substance is produced.

Answer

The shape of the coal changes.

Answer

Oxygen is present.

Answer

Coal is made up of more than one element.

Question 13

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

Accepted Answer

The element is sodium, and it is highly reactive.

Answer

The element is sodium, and it is not very reactive.

Answer

The element is fluorine, and it is not very reactive.

Answer

The element is fluorine, and it is highly reactive

Question 14

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom? Be sure to use the correct place value.

Accepted Answer

48

Question 15

All the following reactions are correctly balanced except —

Accepted Answer

$NaHCO_{3}$ → $Na_{2}CO_{3}$ + $H_{2}O$ + $CO_{2}$

Answer

$4Fe$ + $3O_{2}$ → $2Fe_{2}O_{3}$

Answer

$2CH_{3}OH$ + $3O_{2}$ → $2CO_{2}$ + $4H_{2}O$

Answer

$2C_{2} H_{2}$ + $5O_{2}$ → $4CO_{2}$ + $2H_{2}O$

Question 16

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?

Accepted Answer

Strontium

Answer

Aluminum

Answer

Silicon

Answer

Lithium

Question 17

Which of these formulas contain equal numbers of nitrogen atoms?

Accepted Answer

Formulas I, II, and V

Answer

Formulas I and III

Answer

Formulas II and III

Answer

Formulas I and IV

Question 18

The equation below represents a chemical reaction that occurs in living cells. 
$C_{6}H_{12}O_{6}$ + $6O_{2}$ ⎯⎯→ $6CO_{2}$ + $6H_{2}O$ + energy
How many atoms are represented in the reactants of this equation?

Accepted Answer

36

Answer

24

Answer

6

Answer

12

Question 19

A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?

Accepted Answer

The number of protons

Answer

The number of valence electrons

Answer

The number of neutrons

Answer

The location of valence electrons

Question 20

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with —

Accepted Answer

electrons orbiting a dense nucleus made of protons and neutrons

Answer

electrons and protons orbiting a cloud of neutrons

Answer

neutrons and protons orbiting a cloud of electrons

Answer

protons orbiting a dense nucleus made of electrons and neutrons

Question 21

For an investigation a student poured a blue solution of CuSO into a beaker. The student 4 placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. The student inferred that a chemical reaction occurred. What evidence supports this inference?

Accepted Answer

A dark solid formed on the zinc metal.

Answer

The zinc metal remained silver-colored and shiny.

Answer

None of these

Answer

The CuSO solution turned blue when the zinc metal was added.

Question 22

Which two elements on the periodic table are in the same period?

Accepted Answer

Sn and Rb

Answer

K and Ba

Answer

F and Cl

Answer

Se and Te

Question 23

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

Accepted Answer

$H_{2}SO_{4}$

Answer

$H_{3}PO_{4}$

Answer

$H_{2}O$

Answer

$HClO_{3}$

Question 24

Students were asked to identify the location of elements in the periodic table based on clues printed on game cards. Based on the data, which periodic table shows the correct location of the four elements?

Accepted Answer

#texas/ebf4b61e-8fbe-4c0b-9c17-489e5d067b7d/B.png

Answer

#texas/ebf4b61e-8fbe-4c0b-9c17-489e5d067b7d/A.png

Answer

#texas/ebf4b61e-8fbe-4c0b-9c17-489e5d067b7d/C.png

Answer

#texas/ebf4b61e-8fbe-4c0b-9c17-489e5d067b7d/D.png

Question 25

Which statement correctly describes the location and charge of the electrons in an atom?

Accepted Answer

The electrons are outside the nucleus and have a negative charge.

Answer

The electrons are inside the nucleus and have a negative charge.

Answer

The electrons are inside the nucleus and have no charge.

Answer

The electrons are outside the nucleus and have no charge.

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