Assignment 1

Match each property to the appropriate subatomic particle.
Drag each property into the correct bin.

proton: symbol P, + 1 neutron: symbol n, 0 Electron: symbol e, -1

Sort the subatomic particles according to their masses.
Drag each subatomic particles into the correct bin.

mass of 1 amu: proton, neutron mass of 1/2000 amu, electron

Atoms with the same number of protons but with different electrical charges _____.

are different ions

In salt, what is the nature of the bond between sodium and chlorine?

ionic

What is the result of the animated process?

a positively charged sodium ion and a negatively charged chlorine ion

An ionic bond involves _____.

an attraction between ions of opposite charge

How can you determine the approximate mass of an atom, in atomic mass units?

Add up the number of protons and neutrons.

What holds electrons in a covalent bond?

The negative charges on the electrons are attracted by the positive charges on both nuclei.

If an atom has a charge of -2, which of the following must be true?

It has two more electrons than protons.

What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?

6

Which of these refers to atoms with the same atomic number but different atomic masses?

These atoms are isotopes.

Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?

10

An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have?

5

When one of the atoms involved in a covalent bond has a much higher electronegativity than the other atom, what type of bond results?

a polar covalent bond

The innermost electron shell of an atom can hold up to _____ electrons.

2

Which of these relationships is true of an uncharged atom?

The number of protons is equal to the number of electrons.

What determines the types of chemical reactions that an atom participates in?

the number of electrons in the outermost electron shell

An atom has six electrons in its valence shell. How many single covalent bonds would you expect it to form in most circumstances?

two

Which term describes the degree to which an element attracts electrons?

electronegativity

Which terms describe two atoms when they form a bond in which electrons are completely transferred from one atom to the other?

Anion and cation

Which of the following statements about the atoms in a water molecule is true?

The oxygen atom in a water molecule has a partial negative charge.

Why does water require so much energy to change its phase?

Water has a large number of hydrogen bonds.

What type of bond is joining the two hydrogen atoms?

covalent

A(n) _____ refers to two or more atoms held together by covalent bonds.

molecule

This atom can form up to _____ single covalent bond(s).

4

A(n) _____ bond joins these two oxygen atoms.

double covalent

What is the arrow pointing to? ( single + ion)

hydrogen ion

What is the arrow pointing to? (two ions - charged)

hydroxide ion

In a neutral solution the concentration of _____.

hydrogen ions is equal to the concentration of hydroxide ions

How does the pH of the solution on the right compare with that of the solution on the left?

The solution on the right is basic relative to the solution on the left.

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Assignment 1

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Match each property to the appropriate subatomic particle.
Drag each property into the correct bin.

proton: symbol P, + 1 neutron: symbol n, 0 Electron: symbol e, -1

Sort the subatomic particles according to their masses.
Drag each subatomic particles into the correct bin.

mass of 1 amu: proton, neutron mass of 1/2000 amu, electron

Atoms with the same number of protons but with different electrical charges _____.

are different ions

In salt, what is the nature of the bond between sodium and chlorine?

ionic

What is the result of the animated process?

a positively charged sodium ion and a negatively charged chlorine ion

An ionic bond involves _____.

an attraction between ions of opposite charge

How can you determine the approximate mass of an atom, in atomic mass units?

Add up the number of protons and neutrons.

What holds electrons in a covalent bond?

The negative charges on the electrons are attracted by the positive charges on both nuclei.

If an atom has a charge of -2, which of the following must be true?

It has two more electrons than protons.

What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?

6

Which of these refers to atoms with the same atomic number but different atomic masses?

These atoms are isotopes.

Fluorine’s atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?

10

An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have?

5

When one of the atoms involved in a covalent bond has a much higher electronegativity than the other atom, what type of bond results?

a polar covalent bond

The innermost electron shell of an atom can hold up to _____ electrons.

2

Which of these relationships is true of an uncharged atom?

The number of protons is equal to the number of electrons.

What determines the types of chemical reactions that an atom participates in?

the number of electrons in the outermost electron shell

An atom has six electrons in its valence shell. How many single covalent bonds would you expect it to form in most circumstances?

two

Which term describes the degree to which an element attracts electrons?

electronegativity

Which terms describe two atoms when they form a bond in which electrons are completely transferred from one atom to the other?

Anion and cation

Which of the following statements about the atoms in a water molecule is true?

The oxygen atom in a water molecule has a partial negative charge.

Why does water require so much energy to change its phase?

Water has a large number of hydrogen bonds.

What type of bond is joining the two hydrogen atoms?

covalent

A(n) _____ refers to two or more atoms held together by covalent bonds.

molecule

This atom can form up to _____ single covalent bond(s).

4

A(n) _____ bond joins these two oxygen atoms.

double covalent

What is the arrow pointing to? ( single + ion)

hydrogen ion

What is the arrow pointing to? (two ions – charged)

hydroxide ion

In a neutral solution the concentration of _____.

hydrogen ions is equal to the concentration of hydroxide ions

How does the pH of the solution on the right compare with that of the solution on the left?

The solution on the right is basic relative to the solution on the left.

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