Quiz about Science STAAR

Question 1

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 2

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 3

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 4

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 5

What is the primary function of the chloroplasts in plant cells?

Accepted Answer

To capture light energy and convert it into chemical energy

Answer

To break down sugar molecules to release energy

Answer

To store water and nutrients

Answer

To control the entry and exit of substances in and out of the cell

Question 6

What is the term for the amount of matter in an object?

Accepted Answer

Mass

Answer

Weight

Answer

Density

Answer

Volume

Question 7

What is the term for the movement of particles from an area of higher concentration to an area of lower concentration?

Accepted Answer

Diffusion

Answer

Osmosis

Answer

Active transport

Answer

Endocytosis

Question 8

What type of symbiotic relationship benefits one organism without harming the other?

Accepted Answer

Commensalism

Answer

Mutualism

Answer

Parasitism

Answer

Predation

Question 9

Which of the following is NOT a renewable resource?

Accepted Answer

Coal

Answer

Solar energy

Answer

Wind energy

Answer

Hydroelectric power

Question 10

Which of the following is a chemical change?

Accepted Answer

Burning wood

Answer

Dissolving salt in water

Answer

Boiling water

Answer

Melting ice

Question 11

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 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

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 20

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 21

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 22

Which of the following best describes the process of photosynthesis?

Accepted Answer

B) Conversion of light energy into chemical energy

Answer

A) Conversion of chemical energy into light energy

Answer

C) Conversion of thermal energy into mechanical energy

Answer

D) Conversion of mechanical energy into thermal energy

Question 23

What is the primary function of the mitochondria in eukaryotic cells?

Accepted Answer

C) To produce ATP through cellular respiration

Answer

A) To synthesize proteins

Answer

B) To store genetic information

Answer

D) To facilitate cell division

Question 24

Which of the following is an example of a chemical reaction?

Accepted Answer

C) Rusting of iron

Answer

A) Melting ice

Answer

B) Boiling water

Answer

D) Breaking a glass

Question 25

What is the term for the smallest unit of a chemical element that retains its chemical properties?

Accepted Answer

B) Atom

Answer

A) Molecule

Answer

C) Compound

Answer

D) Ion

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