# Y2_T4_Practice test

Practice Test
• notebook (blanc page)
• Calculator
• Ruler/triangle
• Pen

1 / 15
Slide 1: Tekstslide
ScienceMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 15 slides, met interactieve quizzen en tekstslides.

Lesduur is: 90 min

## Onderdelen in deze les

Practice Test
• notebook (blanc page)
• Calculator
• Ruler/triangle
• Pen

#### Slide 1 -Tekstslide

Liquid nitrogen: (5 points)
Liquid nitrogen is often used in molecular cooking to make ice cream. Cooks will add liquid nitrogen (which is usually around -195C) to the ice cream mixture and as they mix it in the ice cream freezes, any liquid nitrogen left in the mixture evaporates into nitrogen gas which is naturally in the air around us. Liquid nitrogen has a freezing point of -210C and a boiling point of -170C.

#### Slide 2 -Tekstslide

Q1: Draw a transition diagram in your notebook. Make sure to label the phases as well as the transitions over the different parts of your graph. (3p)

#### Slide 3 -Open vraag

Phase transitions
During a phase change the
temperature stays constant.

The temperature will not
change until all molecules
have transitioned.

#### Slide 4 -Tekstslide

Q2: What phase is nitrogen at 80 K? Use a calculation to support your answer. (2p)

#### Slide 5 -Open vraag

Biological soaps: (6 points)
Biological soaps use natural enzymes to clean the dirt from your hands or dirty clothes. The optimum temperature these enzymes is often around 40 degrees.

#### Slide 6 -Tekstslide

Q3: What would happen if someone washes their clothes at 50C. (2p)

#### Slide 7 -Open vraag

Q3: What would happen if someone washes their hands with cold water, which is about 10C (2p)

#### Slide 8 -Open vraag

Most thermostat taps have a maximum setting so kids cannot burn themselves, this lock is often around 35C. Is this a good temperature for using biological soaps? (2p)

#### Slide 9 -Open vraag

Climbers: (8 points)
This forces diagram shows a climber abseiling down a cliff. This diagram shows proper gear and ropes are of life and death importance.

Copy the diagram into your notebook:
The climber is a block of 1 cm wide and 2 cm high.  scale: 1 cm = 50N
Fg= 800N, Ft=1000N, Ffr=100N, Fn=50N

#### Slide 11 -Open vraag

If a climber pushes off from the wall there are only 2 forces left at work, what are these 2 forces? (2p)

#### Slide 12 -Open vraag

If a climber pushes off from the wall there are only 2 forces left at work, calculate the resulting force (2p)

#### Slide 13 -Open vraag

If a climber is touching the wall all 4 forces are at work, calculate the resulting force. Round up to full numbers. (2p)
a2+b2=c2

#### Slide 14 -Open vraag

Study for the Test:
• study all the glossaries
• study the notes
• review all the hw exercises
Make sure you bring:
• ruler/triangle
• calculator
• pen
• highlight marker