Chemical and Physical Properties

What visible signs indicate a precipitation reaction when two solutions are mixed? Solid settling out in the test tube A hazy or cloudy appearance A color change Bubbling in the test tube

A hazy or cloudy appearance Solid settling out in the test tube

Determine whether each observation generally corresponds to a physical change or a chemical change. A precipitate is formed from two solutions. Bubbles are produced upon mixing two solutions. A liquid freezes into a solid. The color of a substance changes over time. A solid dissolves into water. A solution heats up upon mixing with another.

Chemical change Chemical change Physical change Chemical change Physical change Chemical change

Gas to solid

Deposition

Solid to gas

Sublimation

9 Metalloid

an element that has physical and chemical properties of both metals and nonmetals B,Si, Ge, As, Sb, Te, Po, At, Ts

Identify the common indicators that a chemical reaction has occurred. Select one or more: A change in temperature A solid being dissolved Bubbles being produced Precipitate being formed A phase change A color change

A change in temperature Bubbles being produced Precipitate being formed A color change

Identify the observations that indicate an added solute is insoluble in water. Select one or more: The solute and water appear uniformly clear after mixing and allowing to settle. The combination of the solute and water appears cloudy after mixing and allowing to settle. A clear line appears between the added liquid and water after mixing and allowing to settle. The added solid settles to the bottom after mixing and allowing to settle. The addition of the solute to water causes the combination to feel warm when mixed.

Correct: A clear line appears between the added liquid and water after mixing and allowing to settle. The added solid settles to the bottom after mixing and allowing to settle. The combination of the solute and water appears cloudy after mixing and allowing to settle. Incorrect: The addition of the solute to water causes the combination to feel warm when mixed. The solute and water appear uniformly clear after mixing and allowing to settle.

Liquid to solid

Freezing

Solid to liquid

Melting

Determine whether each property is a physical property or a chemical property. Color Solubility Reactivity Density Flammability Melting point

Physical property Physical property Chemical property Physical property Chemical property Physical property

Identify the name of the phase change corresponding to each transition. Liquid to gas

Vaporization

Suppose you mix two solutions in a test tube and the test tube becomes hot. This is...........because............

a sign of a chemical reaction chemical changes can release heat.

Gas to liquid

condensation

Magnesium reacts with oxygen in the air when ........... Unlike other reactions, you should not ........... this reaction

lit with a Bunsen burner look directly at

Suppose you mix a solid into water and not all of it dissolves. This is ........because............

not a sign of a chemical reaction the undissolved solid is not a new substance.

A student is likely to make many observations over the course of the lab session. In general, which types of observations are necessary to record in a lab notebook? number of participants in lab at the time of the experiment color or temperature change of a substance length of time a substance is heated on a hot plate color of the work surface in the lab appearance of gas bubbles during a chemical reaction mass or volume of reagents used

not typically necessary to record should be recorded should be recorded not typically necessary to record should be recorded should be recorded

Match each description to the correct term. a liquid that dissolves another substance a chemical that is dissolved a value used to describe the amount of one substance dissolved in another a liquid consisting of one substance dissolved in another

solvent solute concentration solution