Question

stick and ball: build a molecule!
first and last name: 1.
2.

1. date: period:

do now (on the paper provided by the teacher)
the sugar used in coffee is called sucrose. it has the chemical formula: c₁₂h₂₂o₁₁
a) how many elements are in sucrose? .
name them
b) how many atoms are in a sucrose molecule?
explain:

classwork: stick and ball models
instructions
in this assignment you will work in groups of 2 or 3

1. look for a card inside the bag provided by your teacher. write the class period, date, and

group members names on one side of the card

1. count to ensure you have all the required sticks and balls. each ball represents the model of an

atom. the number of holes in the ball represents the number of chemical bonds that a
particular atom can form with other atoms.
how many bonds can each of these atoms form?
a)nitrogen (yellow) 2 each atom can form ____ bonds

Explanation:

Part a)

Step1: Identify elements from formula

The chemical formula of sucrose is $C_{12}H_{22}O_{11}$. The symbols present are C (Carbon), H (Hydrogen), and O (Oxygen). So we count the distinct symbols.

Step2: Count the elements

There are 3 distinct symbols, so 3 elements. Their names are Carbon, Hydrogen, Oxygen.

Step1: Sum the number of atoms

For $C_{12}H_{22}O_{11}$, we add the subscripts: 12 (C) + 22 (H) + 11 (O).

Step2: Calculate the sum

$12 + 22 + 11 = 45$. The explanation is that we add the number of each type of atom (Carbon:12, Hydrogen:22, Oxygen:11) to get the total number of atoms in one molecule.

Answer:

Number of elements: 3; Names: Carbon, Hydrogen, Oxygen

Part b)