Science Trick: Blue Bottle

Science Trick: Blue Bottle

On shaking: it is BLUE!. . . . On standing it is COLORLESS! Here is why this happens…

WHY DOES THE COLOR CHANGE ??

What is in the solution?

  • Sodium hydroxide – makes the solution basic
  • Glucose acts as a reducing agent (loses electron)
  • Methylene blue – acts as an indicator for the reaction

 

What is happening?

Glucose is a reducing agent and in basic solution will reduce methylene blue to a colourless form.

Shaking the solution admits oxygen which will re-oxidise the methylene blue back to the blue form.

Science Trick: Traffic Light Reaction

Science Trick: Traffic Light Reaction

Why does the solution turn red, yellow and green? Here is a quick demonstration!

 

What is in the solution?

  • Sodium hydroxide – makes the solution basic
  • Glucose – acts as a reducing agent (loses electron)
  • Indigo carmine – indicator for the reaction

 

What is happening?

  • Indigo carmine can exist in oxidised (loss of electron ), reduced (gain of electron) and intermediate forms.
  • Each form has a slightly different structure which means that each structure absorbs a different frequency of light; hence the three different colours – red, yellow and green.

 

Charity Wants to Inspire a Love of Science in Students, and to Equip Communities

Charity Wants to Inspire a Love of Science in Students, and to Equip Communities

Makeshift devices that pick up marshmallows, gaseous substances overflowing, a spinning robot — the little projects that make kids ooh and ahh — if that was the kind of science class you were exposed to.
What brings science lessons to life are enthusiastic teachers and hands-on experiments, but labs and activities require resources, and not all neighbourhoods have them.

Full story at Start Up Toronto

Cardboard Hydraulic Arm

Cardboard Hydraulic Arm

We will introduce fluid power and then you can construct your very own mechanical arm from a few simple materials! The overall construction of the mechanical arm is separated into several parts, each generating a different type of motion. Tips for constructing the mechanical arm and advice for troubleshooting common issues are included in Appendix C. Printable cardboard templates are included in Appendix D.

  • In Part 1, you will build a system that uses fluid power to generate horizontal motion for opening and closing a scoop attached to the mechanical arm.
  • In Part 2, you will build a system that uses fluid power to generate rotational motion for swinging the mechanical arm left and right.
  • In Part 3, you will build a system that uses fluid power to generate vertical motion for lifting and dropping the mechanical arm.
  • In Part 4, you will integrate the three systems you have built to create a working mechanical arm.

What is a fluid?
A fluid is any substance that flows and deforms to take on the shape of the container holding the fluid. Every day examples of fluids include the water you drink and the air you breathe. In general, most liquids and gases can be classified as fluids. The ability of a substance to resist flowing is known as its viscosity. The viscosity of a substance is determined by its molecular structure, which dictates the amount of internal friction experienced by the substance during motion. Honey is more viscous than water, which is why honey flows much more slowly than water. Most solids cannot be classified as fluids because they have very high viscosities.

What is pressure?
The molecules in a fluid are constantly in motion, and this motion generates forces on the surfaces enclosing the fluid. Pressure describes the amount of force per unit area felt by the surface, in units of Pascals (Pa). In a container, the pressure generated is equally distributed over the inner surface of the container.

How is pressure increased or decreased?
Adding fluid to a container will increase the pressure in the container since there are more fluid molecules moving around in the same container. The molecules are more crowded in the container, and bump into the container walls more frequently, generating more force and pressure. Similarly, removing fluid from a container will decrease the pressure in the container since there are less fluid molecules moving in the container. Fewer molecules are available to bump into the container walls, so less pressure is generated inside the container.

Compressibility
What happens to fluids during compression?
When a gas is compressed, the same number of molecules is pushed into a smaller space. This means there is less empty space in the container so the gas molecules will bump into the walls more often, generating more pressure. In order to reduce the pressure, the gas will try to find a way to escape from the container to re-expand.

In a liquid, however, the molecules are already more densely packed than the molecules in a gas. This means it will be very difficult to compress the liquid any further, which is why liquids can be considered incompressible in many cases.

What types of fluid powered systems exist?
The two main types of fluid powered systems are categorized based on the type of fluid used. A pneumatic system uses pressurized or compressed gas to produce mechanical motion. When the gases in a pneumatic system are replaced with liquids, such as water or oil, the system is called a hydraulic system. Both pneumatics and hydraulics take advantage of the potential energy generated from fluid pressure during compression to do work.

Does it matter whether you use pneumatics or hydraulics?
Pneumatic systems are generally quite safe and reliable. Oxygen is commonly pressurized for use in pneumatic systems, and so a leak in the system should not majorly impact the surrounding environment. Since gases readily expand, minor leaks in a pneumatic system do not significantly affect the system’s performance. Hydraulic systems are generally more precise due to liquid incompressibility and the components of the system are often kept well lubricated by the liquid used. Water and oil are typically used in hydraulic systems.

Templates and Procedures

Have fun building your own cardboard hydraulic arm! Please send us photos of you and your class building it : info@puebloscience.org

Give so they can LEARN

Give so they can LEARN

Give So They Can Learn

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Donation Total: $20

Noemi and Cory are 8-year-old girls from a remote indigenous community in Mindanao, Philippines. Their school has a board, a chalk a few books and whatever the teacher can find in the community. For 20$ you can enhance the learning experience of 20 kids like Noemi and Cory with a kit to teach them about clean water and renewable energy. Pueblo Science’s goal is to inspire children to turn their childhood curiosity into a passion for lifelong learning and discovery that could break them out of the cycle of poverty.

Contributions from generous donors allowed a team of Pueblo Science and Ateneo de Davao volunteers to spend a day with Noemi, Cory and their school mates to play and learn science. Your donations will help us go back to Noemi and Cory’s village in 2018 and provide them with the much needed resources and learning experience!

Our goal (1000$) will allow us to reach two indigenous community villages. Thank you for your generosity.

Volunteer Information Session

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Do you want to get involved in helping local communities and harness real world skills in communication and teaching? Do you want to travel to developing countries and help remote communities? Join us and learn more about volunteer opportunities at Pueblo Science.

Activity Facilitator – Science on Ice Waterloo Recreation complex

Number of Volunteers Needed: 20

Event name: Science on Ice

Event Description:

The event brings science-based entertainment and activities to varsity hockey games at several Ontario universities. We have booths around the rink with hands-on activities and our volunteers provide science shows on the ice at the intermissions. These events are attended by thousands of students from local schools.

When: November 30, 2016

Time: 10-1 pm or 10-11:30 or 11:30-1 pm

Where: 101 Father David Bauer Drive, Waterloo, ON N2L 0B4
How to apply:

Please fill out the online form below by November 23, 2016

* indicates required field
Input the position title from the top of the page

Activity Facilitator- Science on Ice UofT Varsity

Number of Volunteers Needed: 20

Event name: Science on Ice

Event Description:

The event brings science-based entertainment and activities to varsity hockey games at several Ontario universities. We have booths around the rink with hands-on activities and our volunteers provide science shows on the ice at the intermissions. These events are attended by thousands of students from local schools.

When: November 23, 2016

Time: 10-1 pm or 10-11:30 or 11:30-1 pm

Where: University of Toronto Varsity, 299 Bloor St W, Toronto, ON M5S 1W2.
How to apply:

Please fill out the online form below by November 17, 2016

* indicates required field
Input the position title from the top of the page

Activity Facilitator – Science on Ice Mattamy

Number of Volunteers Needed: 20

Event name: Science on Ice

Event Description:

The event brings science-based entertainment and activities to varsity hockey games at several Ontario universities. We have booths around the rink with hands-on activities and our volunteers provide science shows on the ice at the intermissions. These events are attended by thousands of students from local schools.

When: October 20, 2016

Time: 10-4 pm

Where: Mattamy Athletic Center, 50 Carlton St, Toronto, ON M5B 1J2

How to apply:

Please fill out the online form below by October 15, 2016

* indicates required field
Input the position title from the top of the page