Choose the best answer. Which observation suggests that matter exists as very small, moving particles?
A. Metal can be beaten into sheets
B. Solids will melt when heated
C. Some gases are less dense than air, but other gases are denser.
D. The smell of scent soon fills a room when the bottle is opened

3. What happens to the molecules when steam condenses to water at room temperature?
A. Molecules become smaller.
B. Molecules become regularly arranged.
C. Molecules lose energy
D. Molecules move further apart

4. Which of the following is an example of sublimation?
A. Changing ice to water
B. Spread of purple potassium permanganate in water
C. Solid ammonium chloride changing into vapour
D. Hot air rising above a burning candle

5. If a substance is pure
A. the substance must dissolve in water B. the substance must be colourless
C. the substance must melt at any temperature
D. the substance must melt at an exact known temperature

6. Which one of the following could be a pure substance?
A. Yellow crystals that melt over the range 67°C - 72°C.
B. A blue solution.
C. Colourless crystals that melt at 80°C.
D. A green dye that gives blue and yellow spots in a chromatogram​

An ideal transformer has 60 turns in its primary coil and 360 turns in its secondary coil. if the input rms voltage for the 60-turn coil is 120 v, what is the output rms voltage of the secondary coil?

An isolated conducting spherical shell carries a positive charge. part a which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? electric potential inside the shell is constant and outside the shell is changing as 1/r2 both the electric potential and the electric field does change with r inside and outside the spherical shell electric potential inside and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is equal to zero electric field inside and outside the shell is constant (does not change with the position r), but is not equal to zero electric field inside and outside the shell is changing as 1/r (where r is the distance from the center of the sphere) electric field inside is equal to zero and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is changing as 1/r electric field inside and outside the shell is changing as 1/r2 electric field inside is equal to zero and outside the shell is changing as 1/r2 electric field inside and outside the shell is zero electric field inside is constant and outside the shell is changing as 1/r

Select the three ways that the parallel-plate capacitor differs from a car battery.