Quiz about Science STAAR Category

Question 1

Which statement accurately describes the atoms of a specific element?

Accepted Answer

A zinc, Zn, atom contain 30 protons inside the nucleus and 30 electrons outside the nucleus.

Answer

An Indium, In, Atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

Answer

A scandium, Sc, atom contain 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

Answer

An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus.

Question 2

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 no charge.

Answer

The electrons are outside the nucleus and have no charge.

Answer

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

Question 3

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

Accepted Answer

160

Answer

112

Answer

48

Answer

64

Question 4

What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons of aluminum, Al?

Accepted Answer

21

Answer

52

Answer

13

Answer

34

Question 5

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?

Accepted Answer

48

Answer

84

Answer

72

Answer

36

Question 6

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 the 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

protons orbiting a dense nucleus made of electrons and neutrons

Answer

neutrons and protons orbiting a cloud of electrons

Answer

electrons and protons orbiting a cloud of neutrons

Question 7

A model of a beryllium atom is shown below.

What type of particles are found in the cloud surrounding the atom's nucleus?

Accepted Answer

Negatively charged particles only

Answer

Positively charges particles and negatively charges particles

Answer

Neutral particles and positively charges particles

Answer

Positively charges particles only

Question 8

What is the mass number of a potassium (K) atom that has 20 neutrons?

Accepted Answer

39

Answer

18

Answer

19

Answer

20

Question 9

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 no charge and about the same mass as 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.

Question 10

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 11

A student drew atomic models of four element.

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

Accepted Answer

Neon, because it has two energy levels with eight electrons in the second level

Answer

Chlorine, because is has three energy levels with seven electrons in the third level

Answer

Gallium, because it has four energy levels with three electrons in the fourth level

Answer

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

Question 12

A chemist made the table below to record some atomic properties of four elements.

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?

Accepted Answer

Fluorine is the most reactive because it has 7 electrons in the outer shell.

Answer

Boron is the most reactive because it has the most protons.

Answer

Silicon is the most reactive because it has an equal number of protons and neutrons.

Answer

Gallium is the most reactive because it has many more neutrons than protons.

Question 13

Four students were asked to name the parts of an atom that determine the atom's identity and chemical properties. The students' responses are shown in the table below.

Which student's responses are correct?

Accepted Answer

Student 2

Answer

Student 1

Answer

Student 3

Answer

Student 4

Question 14

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

Accepted Answer

The element is sodium, and it is highly reactive.

Answer

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

Answer

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

Answer

The element if fluorine, and it is highly reactive.

Question 15

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

Accepted Answer

The number of protons

Answer

The number of neutrons

Answer

The location of the valence electrons

Answer

The number of valence electrons

Question 16

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?

Accepted Answer

The 2 valence electrons in each atom of calcium

Answer

The 20 protons in each atom of calcium

Answer

The density of calcium, which is 1.54 g/cm³

Answer

The atomic mass of calcium, which is 40.078 amu

Question 17

The table below lists three characteristics of an atom of an element.

An atom of which element is described by the data in the table?

Accepted Answer

Rubidium (Rb)

Answer

Radon (Rn)

Answer

Cadmium (Cd)

Answer

Astatine (At)

Question 18

A model of an atom is shown below.

An atom or which element is represented by this model?

Accepted Answer

Boron (B)

Answer

Carbon (C)

Answer

Neon (Ne)

Answer

Sodium (Na)

Question 19

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 neutrons 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

Question 20

How many valence electrons are in an atom of each element in Group 15 of the periodic table?

Accepted Answer

5

Answer

15

Answer

7

Answer

10

Question 21

Four students were asked to complete a table for a science assignment. Each student selected one chemical from each of four groups on the periodic table and then classified each element as a metal, a nonmetal, or a metalloid.

Which table was completed correctly?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 22

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

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 23

Which pair of properties describes the elements in Group 18?

Accepted Answer

They are gaseous at room temperature and chemically stable.

Answer

They are chemically stable and liquid at room temperature.

Answer

They have eight valence electrons and are flammable.

Answer

They are magnetic and boil at low temperature.

Question 24

Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q.

Which statement best describes the positions of the two elements on the periodic table?

Accepted Answer

The two elements are in the same group, with Element R just above Element Q.

Answer

The two elements are in the same period, with Element R the first element in the period and Element Q the last element.

Answer

The two elements are side by side in the same period, with Element Q to the left of Element R.

Answer

The two elements are in the same group, with Element Q at the top of the group and Element R at the bottom.

Question 25

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

Lithium

Answer

Aluminum

Answer

Silicon

Question 26

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

Accepted Answer

Sn and Rb

Answer

F and Cl

Answer

K and Ba

Answer

Se and Te

Question 27

A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below.

Which two atoms are of elements in the same group in the periodic table?

Accepted Answer

Atom 1 and Atom 4

Answer

Atom 1 and Atom 2

Answer

Atom 2 and Atom 3

Answer

Atom 3 and Atom 4

Question 28

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

Nitrogen (N)

Answer

Sulfur (S)

Answer

Silicon (Si)

Question 29

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

1

Answer

2

Answer

4

Question 30

Which statement does NOT correctly compare silicon with another element?

Accepted Answer

Silicon conducts electricity as well as copper does.

Answer

Silicon is a better conductor of electricity than sulfur.

Answer

Silicon is a solid at room temperature, but argon is a gas.

Answer

Silicon is less malleable than silver.

Question 31

Aluminum, sulfur, and chlorine are elements found on the periodic table. Tests involving these three element would show that at normal room temperature -

Accepted Answer

aluminum is malleable and conducts electricity

Answer

sulfur is malleable and aluminum conducts electricity

Answer

chlorine is malleable and conducts electricity

Answer

all three elements are malleable and conduct electricity

Question 32

Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table below.

Based on these observations, which sample is most likely a nonmetal?

Accepted Answer

Sample 1

Answer

Sample 2

Answer

Sample 3

Answer

Sample 4

Question 33

The table lists some compounds found in foods and their formulas.

Based on this information, which of these statements is NOT true?

Accepted Answer

A molecules of lactose contains twice as many atoms as a molecule of fructose does.

Answer

A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

Answer

A molecule of fructose contains four more atoms than a molecule of glutamine does.

Answer

A molecules of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

Question 34

A student is using colored beads to make a model of aluminum sulfate, Al₂(SO₄)₃. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads.

What combination of beads should the students use for the model?

Accepted Answer

2 blue, 3 yellow, and 12 green

Answer

6 blue, 3 yellow, and 7 green

Answer

2 blue, 1 yellow, and 4 green

Answer

6 blue, 12 yellow, and 12 green

Question 35

Strontium phosphate, Sr₃(PO₄)₂, is a crystalline substance used in medicine and industry. How many phosphorus atoms are present in the formula for Sr₃(PO₄)₂?

Accepted Answer

2

Answer

3

Answer

4

Answer

8

Question 36

The table shows the chemical formulas for four substances.

Which substances have the same number of carbon atoms?

Accepted Answer

Substances 1 and 3

Answer

Substances 1 and 2

Answer

Substances 2, 3, and 4

Answer

Substances 2 and 3 only

Question 37

Which of these formulas contain equal numbers of nitrogen atoms?

Accepted Answer

Formulas I, II, and V

Answer

Formulas I and III

Answer

Formulas I and IV

Answer

Formulas II and III

Question 38

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

Accepted Answer

H2SO4

Answer

H3PO4

Answer

HClO3

Answer

H2O

Question 39

The chemical formula for sodium sulfate is Na₂SO₄. How many sulfur atoms are in the formula for sodium sulfate?

Accepted Answer

1

Answer

2

Answer

6

Answer

7

Question 40

Seratonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human brain. The formula for one molecule of serotonin is shown below.

C₁₀H₁₂N₂O

How many atoms in all are in a molecule of seratonin?

Accepted Answer

25

Answer

1

Answer

10

Answer

4

Question 41

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 color of the protein

Answer

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

Answer

The physical arrangement of atoms in the structure of the protein

Question 42

As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedures. They measured the mass of each substance before and after each reaction. The table shows their observations.

Assuming the students did not make any careless errors, what likely explains these changes in mass?

Accepted Answer

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.

Answer

Procedure 1: All the reactants were liquids that evaporated.

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

Answer

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

Procedure 2: All the products were liquids.

Answer

Procedure 1: The reactants were liquids with different densities.

Procedure 2: The reactants were combined into only one product.

Question 43

A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred.

Which observation of this process provides evidence of a chemical reaction?

Accepted Answer

The liquid solution changed color.

Answer

Hot water heated the aluminum foil.

Answer

The pan was lined with aluminum foil.

Answer

The hot water cooled.

Question 44

A chemical reaction in which calcium carbonate, CaCO₃, is decomposed results in the production of two simpler compounds.

What mass of calcium carbonate, to the nearest hundredth of a gram, is decomposed in this reaction?

Accepted Answer

49.97

Answer

28.00

Answer

21.97

Answer

6.03

Question 45

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 46

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student 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

The CuSO₄ solution turned blue when the zinc metal was added.

Answer

None of these

Question 47

A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm³ was selected.

Which of the metals was selected?

Accepted Answer

Metal 4

Answer

Metal 1

Answer

Metal 2

Answer

Metal 3

Question 48

A balance and a graduated cylinder are used to determine the density of a mineral sample. The sample has a mass of 14.7 g and a volume of 2.2 cm³. What is the density of the mineral sample?

Accepted Answer

6.7 g/cm3

Answer

0.15 g/cm³

Answer

32 g/cm3

Answer

13 g/cm3

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