Chem 1301 TTU. Ch. 3: Eoc
Classify the following as a physical or chemical change or property. Butter turns rancid if it is left exposed at room temperature.
chemical
Classify the following as a physical or chemical change or property. Milk of magnesia neutralizes stomach acid.
chemical
Classify the following as a physical or chemical change or property. The steel in a car has rust spots.
chemical
Which of the following statements explain the similarities and differences between solids and liquids?
molecules in solids and liquids are relatively close together and interact with each other, liquids flow freely, but solids don't. liquids take on the shape of their container, but solids don't.
Find the examples of physical properties or changes.
melting, color, density.
Classify the following as a mixture or pure substance. The fertilizer your dad spreads on the front lawn in the spring.
mixture
Classify the following as a mixture or pure substance. The fish soup you had for lunch.
mixture
Classify the following as a mixture or pure substance. The hydrogen peroxide you cleaned a cut finger with.
mixture
If iron filings are placed with excess powdered sulfur in a beaker, the iron filings are still attracted by a magnet and could be separated from the sulfur with the magnet. Would this combination of iron and sulfur represent a mixture or a pure substance?
mixture
Classify the following as a physical or chemical change or property. Milk curdles if a few drops of lemon juice are added to it.
physical
Classify the following as a physical or chemical change or property. Salad dressing separates into layers after standing.
physical
The fact that solutions of iron(II) hydroxide are green colored is an example of a _____ property.
physical
Classify the following as a mixture or pure substance. The salt you sprinkle on your French fries.
pure substance
Find the examples of heterogeneous mixtures.
sand in water, oil in water, and foam.
The processes of melting and evaporation involve changes in the _____ of a substance.
state
Find the examples of elements.
Chlorine, aluminum, and oxygen
Find the examples of compounds.
Hydrogen peroxide, carbon dioxide, and salt
Find three examples of homogeneous mixtures.
air, hot tea with sugar, and solution of acetic acid in water
Find the examples of homogeneous mixtures.
brass, hydrogen peroxide, and acetone in water.
Solutions containing nickel(II) ion are usually bright green in color. When potassium hydroxide is added to such a nickel(II) solution, a pale-green fluffy solid forms and settles out of the solution. The fact that a reaction takes place when potassium hydroxide is added to a solution of nickel(II) ions is an example of a _____ property.
chemical
If a piece of hard white blackboard chalk is heated strongly in a flame, the mass of the piece of chalk will decrease, and eventually the chalk will crumble into a fine white dust. Does this change suggest that the chalk is composed of an element or a compound?
compound
If powdered elemental barium and powdered elemental oxygen are poured into a metal beaker and then heated strongly, a very vigorous chemical reaction takes place, and the _____ barium oxide is formed.
compound
Although some elements are found in an isolated state, most elements are found combined as _____ with other elements.
compounds
Find three examples of heterogeneous mixtures.
dust-laden air, lather, and salad with oil.
Which of the following statements explain the similarities and differences between gases and solids?
gases take on the shape of their container, but solids don't. molecules in solids are relatively close together and interact with each other, but in gases they don't. gases flow freely, but solids don't.
Classify the following mixture as heterogeneous or homogeneous: Italian salad dressing.
heterogeneous
Classify the following mixture as heterogeneous or homogeneous: clay.
heterogeneous
Classify the following mixture as heterogeneous or homogeneous: sand at the seaside.
heterogeneous
Classify the following mixture as heterogeneous or homogeneous: the wood from which the desk you are studying on is made.
heterogeneous
Classify the following mixture as homogeneous or heterogeneous: granite.
heterogeneous
Classify the following mixture as homogeneous or heterogeneous: plasticine.
heterogeneous
Classify the following mixture as homogeneous or heterogeneous: your sock drawer.
heterogeneous
Classify the following mixture as heterogeneous or homogeneous: mayonnaise.
homogeneous
Classify the following mixture as homogeneous or heterogeneous: red wine.
homogeneous
Classify the following mixture as homogeneous or heterogeneous: the glass in spectacles.
homogeneous
The composition of a given pure compound _____.
is always the same no matter what the source of the compound
