A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?1 Molecules in both the metal and the surrounding air will start moving at lower speeds. 2Molecules in both the metal and the surrounding air will start moving at higher speeds.3 The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up. 4The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5

Asample of sea water contains 6.28g of sodium chloride per litre of solution. how many milligrams of sodium chloride would be contained in 15.0ml of this solution?

Give one example of a pure (exact) number and of an estimated (measured) number.