17. Classify each of the following as a physical or chemical change or property. a. Oven cleaners contain sodium hydroxide, which converts the grease/oil spatters inside the oven to water-soluble mate- rials, which can be washed away. b. A rubber band stretches when you pull on it. c. A cast-iron frying pan will rust if it is not dried after washing. d. Concentrated hydrochloric acid has a choking, pungent odor. e. Concentrated hydrochloric acid will burn a hole in cotton jeans because the acid breaks down the cellulose fibers in cotton. f. Copper compounds often form beautiful blue crystals when a solution of a given copper compound is evaporated slowly. g. Copper metal combines with substances in the air to form a green "patina" that protects the copper from further reaction. h. Bread turns brown when you heat it in a toaster. i. When you use the perfume your boyfriend gave you for your birthday, the liquid of the perfume evaporates quickly from your skin. j. If you leave your steak on the gas grill too long, the steak will turn black and char. k. Hydrogen peroxide fizzes when it is applied to a cut or scrape.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Classify each of the following as a physical or chemical change or property.
a. Oven cleaners contain sodium hydroxide, which converts the grease/oil spatters
inside the oven to water-soluble materials, which can be washed away.
A rubber band stretches when you pull on it.
A cast-iron frying pan will rust if it is not dried after washing.
Concentrated hydrochloric acid has a choking, pungent odor.
Concentrated hydrochloric acid will burn a hole in cotton jeans because the acid
breaks down the cellulose fibers in cotton.
Copper compounds often form beautiful blue crystals when a solution of a given
copper compound is evaporated slowly.
Copper metal combines with substances in the air 10 form a green “patina” that
protects the copper from further reaction.
Bread turns brown when you heat it in a toaster.
When you use the perfume your boyfriend gave you for your birthday, the liquid of
the perfume evaporates quickly from your skin.
If you leave your steak on the gas grill tot) long, the steak will turn black and char.
Hydrogen peroxide fizzes when it is applied to a cut or scrape
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