Chemical Properties

___________________________ __________________________ Chemical Property Chemical Property: the ability of a substance to ___________ (____________) and form new substances. Glow Sticks! Glow sticks are tubes containing different compounds that, when mixed, undergo a chemical reaction. This produces light. The colour of the glow stick depends on the type of dye in the stick. Inspect your inactivated glow stick. Describe 4 of its physical properties. ___________________________ __________________________ ___________________________ __________________________ 2. Crack your glow sticks! What happened? Be specific! ______________________________________________________________________________________________________________________________________________ 3. The reaction involves the production of energy, which is given off as light in a process called ____________________________.

Reactivity with Other Substances A large part of chemistry is based on _____________ between substances. Scientists perform ______________ _____________ to synthesize new chemicals or products. Examples of Types of Reactions Reactivity with Another Pure Substance Reactivity with Acids Reactivity with Water Reactivity with Oxygen You will learn more about chemical reactions in Grade 10! You need to understand the basics, first!!!

1) Reactivity with Water Example: Calcium carbide reacts with _______________ to form _______________ gas. Acetylene gas is ______________, which makes it useful for generating ____________. This type of light source was common before battery-operated and electric lights. This light source is still used by cavers today.

2) Reactivity with Oxygen Example: Aluminum metal is very reactive with _______________. The reaction causes a layer of ______________ ___________to form on the surface of the aluminum, which protects the metal from weathering. This helps keep aluminum objects that are always exposed to the environment from _______________. For those interested... Aluminum corrodes but it does not rust. Rust refers only to iron and steel. Aluminum is actually very prone to corrosion. However, aluminum corrosion is aluminum oxide, a very hard material that actually protects the underlying aluminum from further corrosion.

3) Reactivity with Acids Example: Baking soda, or ___________ _______________, is a compound that reacts with acids to create ______________ _______________ gas. Many recipes for baked goods use baking soda because the bubbles of _____________ __________that form to make batter and dough rise.

4) Reactivity with Another Pure Substance Knowing how _________ ______________ react with each other provides the _____________ that enables chemists to develop new products.

Combustibility Combustibility: The ability of a substance to ________ in air. Reaction of propane with oxygen releases a large amount of heat.

Stability Stability: The ability of a substance to remain ______________. Refers to how easily the substance _______________ or breaks down. For a chemical to be useful, it must have enough _________________ to ___________ long enough to carry out its required _________________. Gold. Stable or Unstable? Gold – used for jewelery because extremely stable. Stable! Gold has been used as jewellery, decoration, etc. for thousands of years.

Toxicity Toxicity: the ability of a substance to cause __________________effects in plants and animals. Almost all chemicals are poisonous at high enough concentrations. Example: you need _______________ to breath, but too much will kill you. Trimix is a mixture of 3 gases (nitrogen, oxygen and helium) used to increase depth limits and/or dive times. Gold – used for jewelery because extremely stable.

Homework Page 163. Learning Check. #1, 2, 4 Page 165. Review Questions . #1-3, 5, 7. Page 174. Chapter 4 Review. #2-5, 7, 10-13, 16, 17, 18, 20, 22*, 25*, 26*, 27* * - These are level 4 questions! Strive to be able to answer these 