Differetiating between chemical compounds and mixtures

Today we have been working on the differences between chemical compounds and mixtures and we have consolidated our work on the periodic table and elements.

Did you know that the symbol for Sodium is 'Na' because the abbreviation comes from its Latin name, Natrium. The symbol 'S' is for Sulfur and the symbol 'Sm' is for Samarium.

Building a submarine

Today we have built a submarine to work on the concept of buoyancy.

Did you know that, in early times, submarines were often powered by hand because boat engines had not been invented yet?

Archimedes' principle betting game

Today we have been working on the consolidation of the Archimedes' principle. We have worked with a betting game to revise all the concepts to study.

Working on buoyancy

Today we have been working on the concept of buoyancy and the difference between Weight and Upward Buoyant Force.

Did you know that the greek letter rho (ρ) is used in Science to talk about mass density, air density and charge density?

Lab Practice with dynamometers - presentation

Today we have presented the results from the lab practice with the dynamometers.

Did you that when you teach other students, you learn a lot? This is called learning by teaching.

You can watch one of the presentations below.

Practice with the dynamometer

Today we have been working on a lab practice with dynamometers to compare the concepts of mass and weight.

Did you know that dynamometers follow Hooke's law? This law says that the extension of a spring is proportional to the load applied to it.

The length of a spring always changes by the same amount when it is pushed or pulled. The equation for that is:

    F = k·x
    where

        F is how much (push or pull) is on the spring
        k is a constant, the stiffness of the spring.
        x is how far the spring was pushed or pulled

When x = 0, the spring is at the equilibrium position.

Forces reading

Today we have been working with a reading to check some concepts about forces.

Did you know that our concept of weight is relative (we can weight less in the moon, for example), but our mass is always invariable?

Working on the recognition of lab instruments

Today we have been playing a game to search for specific lab instruments at the lab.

Did you know that volumetric pippetes are more accurate than graduated pippetes?

Thermal Equilibrium

Today we have been working with a lab practice to check the concept of thermal equilibrium.

Did you know that thermal equilibrium obeys the zeroth law of thermodynamics?

Energy transfer and storage

Today we have been reviewing concepts for the exam and revising definitions related to concepts of energy transfer and storage.

Checking the Archimedes' Principle

Today we have been working on a lab practice to check the validity of the Archimedes' principle.

Did you know that he could work out the density (or specific gravity) of an object by comparing the object’s weight to the weight of water it pushes out of a jar when completely it was submerged?

Kinetic energy versus potential energy

Today we have worked with the concepts of potential energy and kinetic energy. We have used a set of formulas to calculate each.

Did you know that energy is measured with Joules? They are named after Sir James Prescott Joule.

Archimedes' principle review

Today we have been reviewing the Archimedes' principle and applying formulas related to the forces of upthrust and weight.

Did you know that ships float because the boat is less dense than the water, so it displaces a mass equal to its own instead of sinking?

The Archimedes' Principle

Today we have worked with the Archimedes principle. We have been completing the dossiers and we have practiced the concepts of upthrust and weight as forces that act on bodies when they are immersed in fluids.

Did you know that Archimedes got his idea while bathing?

Calculating Weight

Today we have completed the report for the lab practice on mass and weight.

In this practice, we have tested the formula Weight = mass x gravitational acceleration, and we have represented the results in a graph.

While the results did not match with perfect exactitude, the results point out that there is correlation.

Measuring forces

Today we have started to work with dynamometers to measure weight and electronic balances to measure mass.

We are getting familiar with how these devices work and how they can be useful to measure forces.

By the way, did you know that the average value of gravity on Earth is 9.8 m/s²?