Sue described two subatomic particles below: Particle P: Non-charged particle
Particle Q: Positively charged particle

Which of the following statements is correct based on the descriptions of each particle?

Particle P is an electron and Particle Q is a proton.
Particle P is a neutron and Particle Q is an electron.
Both particles are inside the nucleus of the atom.
Both particles revolve around the nucleus of the atom.

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

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

What is the mass of naoh that would have to be added to 500 ml of a solution of 0.20 m acetic acid in order to achieve a ph of 5.0?