Fill in the blanks with the word that best completes each statement Scientists develop knowledge by making
about the natural world that may lead to a scientific
question
A scientific question may lead to ain)
which can be tested,
The results of
can lead to changes in scientific knowledge,
Intro

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Atoaster oven has a resistive heating element. the average rate at which it dissipates energy as thermal energy is 1.00 \(\rm kw\). in the united states, emf amplitude in household circuits is \(\mathcal e_{\max}\) = 170 \({\rm \; v}\) and the \(\rm ac\) oscillation rate is 60 \(\rm hz\). part a what is the root-mean-square current through the heating element?