USA Science

What does the word organic mean?

• Has water

• Has oxygen

• Has carbon

• Has sugar

Tags

NGSS.HS-LS1-6

What process refers to a chemical reaction that breaks down a molecule by adding water?

• Dehydration

• Dehydration synthesis

• Hydrolysis

• Hydrophobia

The human body maintains a temperature of around 98.6 degrees at all times. Enzymes are involved in almost every chemical reaction in the body. Which of the following describes the connection between these two statements?

• Enzymes function best at a specific temperature.

• The body needs to be warm to prevent hypothermia.

• The body is kept relatively warm to prevent too much enzyme action.

• There is no connection between the two statements.

Tags

NGSS.HS-LS1-3

Some bacteria live in hot springs. Their cells contain enzymes that function best at temperatures of 70 °C or higher. At the temperature of 50 °C, how will the enzymes in these bacterial cells most likely be affected?

• The enzymes will be destroyed by lysosomes

• The enzymes will lose their bond structure and fall apart.

• The enzymes will require less energy to function than at 70 °C.

• The enzymes will not increase the rate of reactions as much as they would at 70 °C.

Sugar has been dissolved in water. If you want to recover the sugar which process should be carried on?

• Neutralization

• Condensation

• Evaporation

• Filtration

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which is the correct form of writing the chemical formula for Ferrous sulfate or Iron (II) sulfate?

• Fe2SO3

• FeSO3

• FeSO4

• Fe2SO4

How many electron can occupy the orbital?

• 2

• 6

• 10

• 14

What is the perimeter of a rectangular room that has a length of 5.1 m and a width that is 2 m less than the length?

• 14.2m

• 16.4m

• 20.4m

• 24.4m

What must happen in order for the oxygen atom to become negatively charged?

• Gain electrons

• Lose electrons

• Retain electrons

• None of the above

Upon entering the room, you observe two balloons suspended from the ceiling. You notice that instead of hanging straight down vertically, the balloons seems to be repelling each other. You can conclusively say that __________________.

• both balloons have a negative charge

• both balloons have a positive charge

• one balloon is charge positively and the other negatively

• both balloons are charged with the same type of charge

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5