Unit 1 Problem Set- Classification of Matter Practice Problems PDF

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Unit 1 Practice Problems on Classification of Matter Instructions: For Each Practice Problem, write your answer in pencil in your Chemistry Spiral Notebook or you may type your answers, but must have a copy saved in your Desktop Chemistry Folder for future reference (and a possible spot check by your teacher) After you finish check in pen with the posted key. 1. Classify each of the following as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. Pure compound Pure element Mixture Pure element

a.

b.

c.

d.

2. List the names of all 7 elements that exist as diatomic molecules and write their diatomic formulas beside the names. Watch this 2 minute Video to find out the names and symbols of the 7 elements: 7 Diatomic Elements (https://tinyurl.com/7dielements) Name of Element Diatomic Formula Hydrogen H2 Oxygen O2 Nitrogen N2 Chlorine CI2 Fluorine F2 Iodine I2 Bromine Br2 3. 4NH3 which represents 4 atoms of N and 12 atoms of H. What number is a coefficient? 4 What number is a subscript? __3___

4. Using this interactive periodic table: Web Elements Interactive Periodic Table , name the elements and the number of atoms of each element in the following formulas: Name Ammonia Sucrose

Formula NH3 C12H22O11

2 molecules of Sucrose

2 C12H22O11

Sodium Nitrate

NaNO3

2 formula units** of Sodium Nitrate *Aluminum Carbonate

2 NaNO3

2 formula units of Aluminum Carbonate Calcium Hydroxide 2 molecules of Hydrogen Peroxide

Al2(CO3)3 2 Al2(CO3)3 Ca(OH)2 2H2O2

Elements and Number 1 Nitrogen, 3 Hydrogen 12 carbon, 22 Hydrogen, 11 Oxygen 24 Carbon, 44hydrogen, 22 oxygen 1 Sodium, 1, Nitrogen, 3 oxygen 2 Sodium, 2 Nitrogen, 6 Oxygen 2 Aluminum, 3 Carbon, 9 Oxygen 4 Aluminum, 6 Carbon, 18 Oxygen 1 calcium, 2 Oxygen, 2 Hydrogen 4 Hydrogen, 4 Oxygen

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*CO32- is called the carbonate ion. It acts as unit and so is put in parentheses. The subscript 3 is used to show that there are 3 carbonate ions, so this avoids writing it like Al 2CO3 CO3 CO3. BUT you should count it this way. ** Formula unit is another name like”molecule” indicating a chemical bonded compound 4. Copy and complete: The difference between an element and a compound is element a pur substance while cimounds are pure substances where two or more different elements form to bond in a set ratio 5. Copy and complete: The difference between an atom and a molecule is atom is the simplist form of matter while a molecule is a group of atoms 6. Carbon monoxide is a compound with the formula CO. From its symbol alone explain why it is a compound and not an element. It is not an element because It is a combination of Carbon & Oxygen to form a new element. So broken down it really is two elements

7. Using atomic level drawings show the difference between an atomic element and a molecular element. Explain your drawings.

Monatomic element Atomic is an element that can stand on its own

Molecular Element It’s a compound of multiple pure but different elements 8. Using atomic level drawings show the difference between a compound and a mixture of two substances.

Looking at the one on the right, its two different substnaces with out any form of ratio or balance

Compound : two or more different substances but ratio(left one) Mixture of two 9. a. Copy and complete: An example of a homogeneous mixture (called a solution where you cannot see the parts) is salty water b. Copy and complete: An example of a heterogeneous mixture (where you can see the parts) is sandy water 10.Classify each of the following examples as an element, compound, or mixture. a. Compound b. element c.compound d.mixture e.element

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f.mixture g.element h.mixture i.mixture j.element k.compound l.mixture

11. Classify each of the following as a chemical (a new substance must be formed to observe) or physical property( no new substance is formed to observe) of silicon symbol Si blue-gray color ___________physical___________ brittle ____physical___________________ doesn’t dissolve in water ____physical change_______________________ melts at 1410 C physical reacts vigorously with fluorine to form a new compound ________chemical______________

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