As you move from left to right across a period of elements in the periodic table, what happens to the number of neutrons in a typical atom?

It decreases until you reach the middle and then it increases.

Which of the following pairs are isotopes of the same element?

atom J (27 protons, 32 neutrons) and atom L (27 protons, 33 neutrons)

atom Q (56 protons, 81 neutrons) and atom R (57 protons, 81 neutrons)

atom V (8 protons, 8 neutrons) and atom W (7 protons, 8 neutrons)

atom S (17 protons, 18 neutrons) and atom T (18 protons, 17 neutrons)

Contrast subatomic particle D with subatomic particle C.

Particle C and particle D have opposite electrical charges.

Particle C and D are both located in the nucleus.

Particle C has a smaller mass than particle D.

Particle C is more energetic than particle D

Given the number of protons, neutrons and electrons, identify the atom of aluminum from the choices.

13 protons, 14 neutrons, 13 electrons

14 protons, 13 neutrons, 27 electrons

14 protons, 27 neutrons, 14 electrons

27 protons, 27 neutrons, 27 electrons

Refer to your periodic table. Compare the elements in the halogen family. Which statement is true regarding a progression from fluorine to iodine?

The elements progressively change phase from gas to liquid to solid.

The elements form progressively higher charged ions.

The elements become progressively less reactive.

The elements decrease in density.

Sodium becomes positively charged when it ________.

has more electrons than protons.

Isotopes of an element have ___.

the same number of protons but a different number of neutrons.

a different number of protons and neutrons.

the same number of protons and neutrons, but no electrons.

the same number of neutrons but a different number of protons.

What element is depicted by the model?

Beryllium because it has an atomic number of 4 and there are 4 protons and electrons pictured.

Boron, because it has an atomic number of 5 and there are 5 neutrons pictured.

Carbon because it is in Group 14 and it has 4 valence electrons. There are 4 electrons pictured.

Potassium because it is the first element in the 4 th period on the periodic table and there are 4 electrons pictured.

During a lab activity, students were given samples of four different unknown elements. They recorded their observations in the table below. What data from the table above supports the claim that sample 1 is the only metal?

Sample 1 because it is shiny and a good conductor of electricity

Sample 2 only because it is shiny and solid at room temperature

Sample 3 only because it is the only sample that is a liquid at room temperature

Samples 1 and 2 because both samples are shiny and solid at room temperature

Hydrogen is typically placed at the top of Group 1 on the Periodic Table. However, Group 1 consists of the alkali metals and hydrogen is not a metal. What reason best explains why hydrogen is placed in this group?

Hydrogen has the same number of valence electrons as the alkali metals

Hydrogen was the first element to be discovered so it is placed first on the periodic table

Hydrogen and the other alkali metals have similar physical properties

There isn’t a space available to place hydrogen with the other nonmetals

Two unknown elements react to a form a single compound. Element 1 is shiny, malleable, and conductive. Element 2 is a non-conductive gas. When they react, what would you expect to be true about the compound produced?

The compound will probably have high boiling points and melting points and will be conductive in solution.

The compound will probably have properties of both elements like a metalloid.

The compound will probably have low boiling and melting points and will not be conductive in solution.

The compound will probably have high boiling and melting points and will not be conductive in solution.

The image below shows the difference between a calcium atom and a calcium ion. Based on the ion structure , which of following elements would form a bond with calcium in a one to one ratio and why?

One selenium ion would bond to one calcium ion because the combination of their charges would result in a full octet.

One bromine ion would bond to one calcium ion because they are both located on period 4.

One selenium ion would bond to one calcium ion because they are both located on period 4.

One bromine ion would bond to one calcium ion because the combination of their charges would result in a full octet.

A compound is composed with the elements shown in the table above. Identify which statements are correct in determining how to name this compound.

II,III, and V are true for this compound

II and VI are true for the compound

I, III, and V are true for this compound

I,IV, and VI are true for this compound

Students in a chemistry class added 5 g of Zinc (Zn) to 50 g of hydrochloric acid (HCl). A chemical reaction occurred that produced zinc chloride (ZnCl 2 ) and 6 g of hydrogen gas (H 2 ). What is the mass of the zinc chloride? Zn+ 2HCl → ZnCl 2 +H 2

Not enough information to determine the mass of the ZnCl 2

Students in a science class observed that when a strip of magnesium (Mg) metal was placed in a test tube containing hydrochloric acid (HCl), the magnesium began to bubble as hydrogen gas and magnesium chloride are formed. Which of the following choices show both the correctly identifies the type of reaction?

Mg+2HCl →H 2 +MgCl 2 (single replacement)

Mg+2HCl →H 2 +MgCl 2 (synthesis)

2Mg+HCl →H 2 +2MgCl 2 (decomposition)

Mg+2HCl →2H 2 +MgCl 2 (double replacement)

1. A teacher performed a demonstration of a chemical reaction by stretching a balloon containing sodium bicarbonate (baking soda) over the top of a flask containing acetic acid (vinegar). When the sodium bicarbonate was added to the acetic acid the balloon began to inflate shown in the figure below. (AKS 3a) (DOK 3) What will the total mass of the flask, the balloon, and products be after the reaction?

100 g because all of the atoms of the reactants remain in the flask

Less than 100 g because some of the solid baking soda disappears

Less than 100 g because the gas produced by the reaction has less mass than the solids and liquids present before the reaction

More than 100 g because the volume of gas inside the balloon has increased

Use the unbalanced equation below to answer the question that follows: H 2 +O 2 →H 2 O Which of the following is the best explanation as to why this equation needs to be balanced?

Because an equation cannot show four atoms reacting to only produce three atoms

Because an equation cannot show two reactants and only one product

Because an equation cannot show two hydrogen atoms on both sides of the equation

Because an equation cannot show four atoms reacting to produce only one product

Water is made of oxygen and hydrogen. Table salt is composed of sodium and chlorine. How do the bonds between these two compounds differ?

Salt is formed with an ionic bond because sodium transfers its electron to chlorine; Water is formed with a covalent bond because oxygen and hydrogen share valence electrons.

Both compounds are ionic because valence electrons are transferred.

Water is formed with an ionic bond because hydrogen transfers its electrons to oxygen; Salt is formed with a covalent bond because sodium and chlorine share valence electrons.

Salt is formed with an ionic bond because chlorine transfers its valance electrons to sodium; Water is a covalent bond because both hydrogen and oxygen are nonmetals.

Chemistry Interim Reviews

Authored by Charles Martinez

Chemistry

8th Grade

NGSS covered

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48 questions

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MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Why do noble gases almost never form chemical bonds?

a) They are very rare.

a) They have very small atomic radii.

a) They have filled valence electrons shells.

It is difficult for gases to form bonds.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these statements is true?

Metals tend to lose electrons and form positive ions.

Nonmetals tend to lose electrons and form positive ions.

Metalloids do not form compounds readily.

Gases share electrons and form positive ions.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Different isotopes indicate that an element will have different numbers of ____.

atoms.

protons.

neutron

electrons

Tags

NGSS.HS-PS1-8

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

One property of an electron is ____.

a net charge of 0.

a net charge of +1.

a net charge of -1.

an atomic mass of

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Which statement explains the difference between a proton and neutron?

Both are found in the nucleus of the atom.

Protons have a mass of 1 amu and neutrons have a mass of 2 amu.

Protons have a positive charge and neutrons have a neutral charge.

Protons are found in the outer energy levels of the atom, and neutrons are found in the nucleus.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What do we definitely know about an atom of magnesium, the element following sodium in the periodic table?

Magnesium is more reactive than sodium.

Magnesium contains more protons than sodium.

Sodium has more valence electrons than magnesium.

Magnesium always contains more protons and neutrons than sodium.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Refer to your periodic table. Which of these elements would you expect to be solid at room temperature?

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Chemistry Interim Reviews

Why do noble gases almost never form chemical bonds?

Which of these statements is true?

Different isotopes indicate that an element will have different numbers of ____.

One property of an electron is ____.

Which statement explains the difference between a proton and neutron?

What do we definitely know about an atom of magnesium, the element following sodium in the periodic table?

Refer to your periodic table. Which of these elements would you expect to be solid at room temperature?

Locate the following four elements in the periodic table: Fe, Hg, Sn, Xe. Which element has the most valence electrons?

Identify the atomic number of the most common isotope of the element in the image.

As you move from left to right across a period of elements in the periodic table, what happens to the number of neutrons in a typical atom?

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