Texas Chemistry

A 10.0 mL sample of a sulfuric acid solution of unknown concentration is diluted to 25.0 mL and then titrated to the phenolphthalein endpoint using 35.88 mL of 0.155 M NaOH. What is the concentration of the sulfuric acid solution?

• 0.111 M

• 0.222 M

• 0.278 M

• 0.444 M

• 0.556 M

What is the sum of the coefficients in the balanced redox reaction when Au3+ and I – react in solution to form elemental products?

• 5

• 6

• 8

• 9

• 13

If you drop a piece of potassium metal into water the following exothermic reaction occurs: 2K(s) + 2H2O(l) --> 2KOH(aq) + H2(g) What are the values of q and w for this reaction, at constant temperature and pressure?

• q is positive and w is negative.

• q is negative and w is positive.

• q and w are both negative.

• q and w are both positive.

• There is not enough information given.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A careless lab assistant misreads the labels on two bottles, and thinking they contain the same reagent, adds 100 mL of 0.50 M AlCl3 to 250 mL of 0.50 M AgClO3. What is the final silver ion concentration in the mixed solution?

• 2.5 X 10^-9 M

• 1.3 X 10^-5 M

• 8.4 X 10^-5 M

• 0.33 M

• 0.071 M

Tags

NGSS.HS-PS1-7

This shows a table salt molecule. What is it?

• compound

• element

• mixture

Tags

NGSS.MS-PS1-1

How many valence electrons does Potassium Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Tags

NGSS.HS-PS1-1

How many valence electrons does Silicon Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Tags

NGSS.HS-PS1-1

Which item on this element square is the chemical symbol?

• Copper

• 29

• Cu

• 63.546

Tags

NGSS.HS-PS1-1

Which of these samples shown best represents an element?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

An element is

• Made up of different types of atoms

• Made up of the same type of atoms

• none of the above

• all of the above

Tags

NGSS.HS-PS1-1