Question

part 2: classify each of the following as elements (e), compounds (c) or mixtures (m). write the letter x if it is none of these. diamond (c) sugar (c₆h₁₂o₆) milk iron (fe) air sulfuric acid (h₂so₄) gasoline electricity krypton (k) bismuth (bi) uranium (u) popcorn water (h₂o) alcohol (ch₃oh) pail of garbage a dog ammonia (nh₃) salt (nacl) energy gold (au) wood bronze ink pizza dry ice (co₂) baking soda (nahco₃) titanium (ti) concrete

Explanation:

Step1: Recall element definition

An element is a pure - substance made of only one type of atom.

Step2: Recall compound definition

A compound is a pure - substance made of two or more different types of atoms chemically combined.

Step3: Recall mixture definition

A mixture is a combination of two or more substances that are not chemically combined.

Diamond (C): E (Carbon is an element)
Sugar ($C_6H_{12}O_6$): C (Made of carbon, hydrogen, and oxygen atoms chemically combined)
Milk: M (Contains water, fats, proteins etc. not chemically combined)
Iron (Fe): E (An element)
Air: M (Mixture of nitrogen, oxygen, carbon - dioxide etc.)
Sulfuric Acid ($H_2SO_4$): C (Made of hydrogen, sulfur, and oxygen atoms chemically combined)
Gasoline: M (Mixture of hydrocarbons)
Electricity: X (Not an element, compound or mixture)
Krypton (K): E (An element)
Bismuth (Bi): E (An element)
Uranium (U): E (An element)
Popcorn: M (Contains different substances like carbohydrates, water etc.)
Water ($H_2O$): C (Made of hydrogen and oxygen atoms chemically combined)
Alcohol ($CH_3OH$): C (Made of carbon, hydrogen, and oxygen atoms chemically combined)
Pail of Garbage: M (Mixture of different waste materials)
A dog: X (Not an element, compound or mixture in this context)
Ammonia ($NH_3$): C (Made of nitrogen and hydrogen atoms chemically combined)
Salt (NaCl): C (Made of sodium and chlorine atoms chemically combined)
Energy: X (Not an element, compound or mixture)
Gold (Au): E (An element)
Wood: M (Mixture of cellulose, lignin etc.)
Bronze: M (Alloy, a mixture of copper and tin)
Ink: M (Mixture of dyes, solvents etc.)
Pizza: M (Mixture of flour, cheese, toppings etc.)
Dry Ice ($CO_2$): C (Made of carbon and oxygen atoms chemically combined)
Baking Soda ($NaHCO_3$): C (Made of sodium, hydrogen, carbon, and oxygen atoms chemically combined)
Titanium (Ti): E (An element)
Concrete: M (Mixture of cement, sand, gravel etc.)

Answer:

Diamond: E
Sugar: C
Milk: M
Iron: E
Air: M
Sulfuric Acid: C
Gasoline: M
Electricity: X
Krypton: E
Bismuth: E
Uranium: E
Popcorn: M
Water: C
Alcohol: C
Pail of Garbage: M
A dog: X
Ammonia: C
Salt: C
Energy: X
Gold: E
Wood: M
Bronze: M
Ink: M
Pizza: M
Dry Ice: C
Baking Soda: C
Titanium: E
Concrete: M