Unit 3 Chemistry

Question 1

Which is incorrect? Scientists did not agree with Mendeleev because ...

Accepted Answer

He ordered the periodic table based upon atomic masses

Question 2

An experiment to calculate q=mcΔT is...

Accepted Answer

Calorimetry

Question 3

An endothermic reaction

Accepted Answer

Requires more energy to break bonds than making bonds gives

Question 4

What ions are exchanged in an ion exchange column?

Accepted Answer

Na+ for Ca2+, Na+ for Mg2+

Question 5

An exothermic reaction...

Accepted Answer

Gives more energy to make bonds than breaking bonds gives

Question 6

Which of the following ordered their periodic table based upon properties of elements

Accepted Answer

Mendeleev

Question 7

Choose the least reactive non - metal from the Halogens...

Accepted Answer

Iodine

Question 8

Which is the correct reaction between sodium bromide and chlorine?

Accepted Answer

2NaBr (aq)+ Cl2(g)-> 2NaCl (aq) + Br2 (l)

Question 9

Which of the following is the most reactive?

Accepted Answer

Caesium

Question 10

Which of the following is incorrect? Potassium is more reactive that Lithium because...

Accepted Answer

Potassium requires more energy to remove the outer electron

Question 11

What is the main way of treating temporary hard water?

Accepted Answer

Boiling

Question 12

Which of the following did not contribute towards the evolution of the Periodic Table

Accepted Answer

Joule

Question 13

What is the common name for calcium stearate?

Accepted Answer

Scum

Question 14

What ions are present in soap?

Accepted Answer

Stearate

Question 15

Which of the following ordered their periodic table based upon atomic weight

Accepted Answer

Newlands, Mendeleev

Question 16

What ions cause hard water to become temporary?

Accepted Answer

HCO3-

Questions 16