How many neutrons does a sodium atom have? (Use the image to help you)

• 23
• 11
• 12
• 34

Tags

NGSS.MS-PS1-1

The electron configuration for an atom of potassium is:

• 1s²2s²2p⁶3s²3p³
• 1s²2s²2p⁶3s²3p⁶
• 1s²2s²2p⁶3s²3p⁶4s¹
• 1s²2s²2p⁶3s²3p⁶4s²

When across a period, the atomic size decreases so the first IE ___________.

• increases

• decreases

• constant

• i am not sure

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

• Percent
• actual
• stoichiometry
• theoretical

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two metals.
• pairs of electrons are shared between two nonmetal atoms.
• two nonmetal atoms are attracted to each other by opposite charges.

Tags

NGSS.HS-PS1-1

Rank these in order of strength (strongest first):

van der Waals (London)

hydrogen bond

dipole-dipole attraction

• dipole-dipole>hydrogen bond>vdW (London)

• vdW>dipole-dipole>hydrogen bond>covalent bond

• hydrogen bond>dipole-dipole>vdW

What information do we look for on the periodic table if we  want to examine intermolecular forces?

• atomic mass
• atomic number
• electronegativity
• ionization 

Tags

NGSS.HS-PS1-3

Atomic radius generally increases as we move __________.  

• down a group and from right to left across a period 
• up a group and from left to right across a period 
• down a group and from left to right across a period 
• up a group and from right to left across a period 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The sum of the oxidation numbers in Na₂CO₃ is equivalent to

• 0

• -2

• +1

• -1

Magnesium + sulphuric acid --> ?

• magnesium sulfate + water
• magnesium sulfate + hydrogen
• magnesium chloride + hydrogen
• magnesium chloride + water