HCC CHEM1305 Chapter 3 Homework Assignment Latest 2021 January

CHEM1305 Introductory Chemistry

Chapter 3 Homework Assignment  

Question 1Which of the following is NOT an example of matter?

  a cup of water

  a helium balloon

  light

  a pillow

 Question 2How many carbon atoms are there in the chemical formula for iron(III) carbonate, Fe2(CO3)3?

  1

  2

  3

  4

 Question 3Which phase of matter has a definite volume but an indefinite (variable) shape?

  solid

  liquid

  gas

  plasma

 Question 4Classify each type of matter as either an element, a compound, a homogeneous mixture, or a heterogeneous mixture.

a) a bowl of cereal with milk heterogeneous mixture

b) sodium element

c) carbon dioxide compound

d) apple juice homogeneous mixture

Question 5Classify each property as physical or chemical.

a) silver is a silver-colored metal physical property

b) propane gas readily burns in air chemical property

c) pure sodium will explode if dropped in water chemical property

d) copper conducts electricity physical property

Question 6Classify each change as physical or chemical.

a) a match is ignited physical change

b) a drop of alcohol evaporates

c) two colorless solutions are combined and form a yellow color

d) a tablet of aspirin is ground to a powder physical change

Question 7In a reaction, 1.000 g copper metal is heated with yellow sulfur to form copper sulfide as a product. 1.252 g of copper sulfide is made. What is the mass of sulfur that had reacted with the copper metal?

  0.252 g

  1.000 g

  1.252 g

  2.252 g

 Question 8Energy cannot be created or destroyed, it can only be changed from one form to another.

  True

  False

 Question 9Substances at higher temperatures have a higher kinetic energy (atoms are moving faster) than substances at lower temperatures (atoms are moving slower).

  True

  False

 Question 10What is the boiling point of water according to the Kelvin scale?

  100 K

  212 K

  273 K

  373 K