Density Tower

Remediation day 1

Complete this review. You can use your notes, or watch the videos in each slides to remind yourself about the topics.

How to Find Density

• Density = Mass / Volume

• Mass = Density x Volume

• Volume = Mass / Density

Multiple Choice

A rock has a mass of 14g and a volume of 2cm³. What is the density of the rock?

• 7 mL

• 7 g/cm³

• 28 g/cm³

• 1/7 g/cm³

Density Column

Depending on the density of object or liquid, it will sink or float in the density column.

When something has a high density (more dense) compare to others then it will sink towards the bottom.

Open Ended

Refer to the density tower that you saw in the video on Slide #4.

Density of water is 1.00 g/mL and dish soap is 1.06 g/mL. Cherry tomato is suspended in between the water and dish soap.

Predict the density of cherry tomato and explain.

Law of Conservation of Matter

• Matter is not created or destroyed in a chemical reaction.

• Mass of Reactant = Mass of Product

• Mass is in [g]

Multiple Choice

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

Light Emission

• Two process: Absorption, Emission

• Absorption: Electron absorbs energy(light/photon) and jumps up from the ground state to the higher energy level to become excited.

• Emission: Electron releases energy as a light and jumps back from excited state to the ground state.

Multiple Choice

Emission of light from an atom occurs when an electron

• drops from a higher to a lower energy level.
•    jumps from a lower to a higher energy level.   
•    moves within its atomic orbital.
• falls into the nucleus.

Electronegativity [EN]

• : atom's ability to attract electrons from other atoms

• Fluorine has the highest EN

• Noble gases has no value

Multiple Choice

Which has the greater Electronegativity:

N or C?

• C

• N

Predicting the products: Single Replacement

• Cation: AB + C --> A + CB

• Anion: AB + C --> AC + B

• Ionic compound: Cation-Anion

• Diatomic atoms: H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

Multiple Choice

Predict the products for the this Single Replacement reaction:

K + HCl →

• KCl + H₂

• KHCl

• KH + Cl₂

• HCl + K₂