CP- L2.2 Counting Atoms

CP- L2.2 Counting Atoms

Ms. Bailey*

​Quick IA Review Question!

29

Open Ended

Why is there a force between the aerialist feet and the rope and NOT the rope nd the bar?

SS: There is a relationship between the feet and the rope because....

Multiple Choice

A leaf fell from a tree branch. The path it followed is shown in the diagram below. Which of these best describes why the leaf fell in a crooked path instead of straight down?

• Objects with irregular shapes never fall in straight lines.

• Air currents and gravity applied caused unbalanced force to be applied to the leaf.

• The upward force of the air on the leaf was greater than the downward force of gravity.

• Once the leaf was in motion, it continued moving in the same direction because the forces were balanced.

Open Ended

Why do unbalanced forces cause irregular movements?

SS: Unbalanced forces cause irregular movements because....

Multiple Choice

Which objects in the list experience an unbalanced force?

• The book, the ball, and the car

• The ball, the car, and the bird

• The can, the swing, and the bird

• The book, the ball, the can, and the swing

Open Ended

why do the can, the bird and the swing all experience an unbalanced force?

SS: They all experience an unbalanced force because...

​GREAT JOB to those of you who participated. Remember participation increases our knowledge!!

​Counting Atoms Continued!

​Objective: KWBAT calculate the number of atoms in a chemical formula using coefficients, parentheses and subscripts

​TEKs: 8.5(D): recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts

Open Ended

Explain what this formula means/ represents./ tells you.

SS: This formula tells me that....

Multiple Choice

How many compounds of H2CO3 are there in the formula above?  How do you know?

• There are three because there are three different numbers in the equation.

• there are three because of the coefficient

• There are five because you add up all the subscripts ( the little numbers)

• There are right because you add up all the numbers.

Multiple Choice

Phosphoric acid has the chemical formula: H2PO4. What elements are present in this formula?

• Oxygen, Hydrogen and Phosphorus

• Oxygen, Helium and phosphorus

• Phosphorus and hydrogen

Multiple Choice

How many atoms of each element are present?

• H=6

  C=3

  O=9

• H=2

  C=1

  O=3

• H=5

  C=6

  O=

​The symbol of an element represents one atom of that element.

​A subscript is a number written in the lower right corner after the symbol of an element.  If there is only one atom of a particular element, no subscript is used.  If there is more than one atom of the element, then the subscript is used to indicate the number of atoms.

Multiple Choice

C= ?

• Carbon

• calcium

• chlorine

Multiple Choice

Ni=?

• Nickel

• sodium

• neon

Multiple Choice

Sn=?

• Tin

• scandium

• sulfur

Multiple Choice

Kr=?

• krypton

• potassium

• argon

Multiple Choice

$$N_2=$$  

• two atoms of nitrogen

• two atoms of nickel

• two atoms of sodium

Multiple Choice

$$Co_4=$$  

• four atoms of cobalt

• four atoms of calcium

• one atom of carbon and four of oxygen

Multiple Choice

$$Ag_7=$$  

• one atom of aluminum and seven of silver

• seven atoms of silver

• one atom of gold and seven of galium

Multiple Choice

how many atoms of each element?

• K=2

  S=1

  O=4

• K=2

  S=4

  O=4

• K=2

  SO=4

Multiple Choice

$$F_2O_4Cl_8$$   

• F=2

  O=4

  Cl=8

• F=2

  O=4

  C=1

  L=8

• F=2

  O=4

  C=0

  L=8

​A coefficient is a number written in front of a chemical symbol and indicates the number of atoms of that element or number of compounds. NOTE: a coefficient multiplies the number of atoms of each element in the formula (just like the distributive property in math!)

Multiple Choice

$$4Fe=$$  

• F=4

  E=1

• F=1

  E=0

• Fe=4

Multiple Choice

$$2O_2$$  

• O=2

• O=4

Multiple Choice

$$2AgNO_3$$  

• Ag=1

  N=1

  O=3

• Ag=2

  N=2

  O=6

• Ag=2

  N=2

  O=3

Multiple Choice

$$4Al_2NF_4Ne_3$$  

• Al=8

  N=4

  F=16

  Ne=12

• Al=8

  N=0

  F=8

  Ne=12

• Al=2

  N=1

  F=16

  Ne=3

• Al=8

  N=4

  F=16

  N=1

  E=12

​When parentheses (  ) are used for a subgroup of atoms, you must multiply the subscript outside the parentheses by the number of atoms inside the parentheses.

Multiple Choice

• O=2

  H=2

• O=1

  H=1

Multiple Choice

• S=3

  O=12

• S=7

  O=4

• S=1

  O=4

Multiple Choice

$$Li_4\left(Ti_2\right)_4Hg_6\left(S_5\right)_5$$  

• Li=4

  Ti=8

  Hg=6

  S=25

• Li=4

  Ti=2

  Hg=6

  S=5

• Li=4

  Ti=6

  Hg=6

  S=10

Multiple Choice

left box....

• coefficient

• subscript

• parenthesis

• symbol

Multiple Choice

middle box

• coeffieient

• subscript

• parenthesis

• symbol

Multiple Choice

right box

• coefficient

• subscript

• parenthesis

• symbol

Multiple Choice

 How many H, S  and O atoms are present in one compound of $$H_2SO_4$$  

• H=2

  O=4

  S=1

• H=2

  O=4

  S=4

• H=2

  S=0

  O=4

Multiple Choice

How many H, S and O atoms are present in two compounds of $$H_2SO_4$$  ?

• H=4

  S=2

  O=8

• H=2

  S=1

  O=4

• H=4

  S=0

  O=6

• H=4

  S=1

  O=8

Multiple Choice

Caffeine has the following chemical formula:

$$C_8H_{10}N_4O_2$$  .

One compound of caffeine contains─

• 10 carbon atoms, 8 hydrogen atoms, 10 nitrogen atoms, and 4 oxygen atoms

• 8 carbon atoms, 10 hydrogen atoms, 2 nitrogen atoms, and 4 oxygen atoms

• 8 carbon atoms, 10 hydrogen atoms, 4 nitrogen atoms, and 2 oxygen atoms

• 1 carbon atoms, 8 hydrogen atoms, 10 nitrogen atoms, and 2 oxygen atoms

Open Ended

How many atoms of  oxygen are there in Ba(OH)2?

SS: MUST BE A COMPLETE SENTENCE!!

​Start a new page. Title: Equation Annotations

​1. Grab four different colored pencils

2. Make a key for each annotation​

Open Ended

How many total carbon atoms are there in the reaction above?

SS: COMPLETE SENTENCE!!!

Open Ended

How many atoms are represented in the reactants of the equation above?

SS: COMPLETE SENTENCE!!!

Multiple Choice

Which of the formulas contain 3 atoms of oxygen?

• Formula I

• Formula II

• Formula III

• Formula IV

Multiple Choice

Which of the formulas contain 4 oxygen atoms?

• formula one

• formula two

• formula three

• formula four

Multiple Choice

Which of the formulas contain double the number of oxygen atoms as Al(OH)3?

• formula two

• formula three

• formula four

• formula to and four

​WHEW!!! lots of practice today!!

Any questions? ​

​Lets move to our exit ticket for today!

Multiple Choice

The names and chemical formulas of four substances are shown in the chart. Which substance listed in the chart is made up of the most atoms?

• Carbonic acid

• Nitric acid

• Phosphoric acid

• Sulfuric acid

Multiple Choice

The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is NOT true?

• A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

• A molecule of lactose contains twice as many atoms as a molecule of fructose does.

• A molecule of fructose contains four more atoms than a molecule of glutamine does.

• A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

Multiple Choice

A student is using colored beads to make a model of aluminum sulfate, $$Al_2\left(SO_4\right)_3$$  Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads.

What combination of beads should the student use for the model?

• 6 blue, 3 yellow, and 7 green

• 2 blue, 1 yellow, and 4 green

• 2 blue, 3 yellow, and 12 green

• 6 blue, 12 yellow, and 12 green

​WE ARE COMING TO AN END OF THIS UNIT.... EOU TEST IS COMING SOON!!!