Which of the following is an example of convection?

a hot object transferring heat to a cooler one

hot air rising and cooler air falling

the rays of the Sun warming the earth

a hot oven warming the air around it

Why is oil unable to dissolve well in water? Water is polar and oil is nonpolar, which means they have no attraction for each other. Oil molecules are too large to fit between the closely spaced water molecules in the liquid state.

One radioactive isotope of calcium has an atomic mass of 47. How many protons are in this calcium-47 nucleus? A) 17 B) 20 C) 27 D) 47

The chemical formula for table sugar is c12h22o11. what can you tell from this formula

What experiment led to the discovery of the nucleus

A person produces the least friction moving across what suffaces?

What is a light-year? A. the distance light travels in one earth year B. the distance light travels from the sun to the earth C. the distance light travels in one orbit of the moon D. the time it takes light to travel across the universe

What's is a logical way that you could begin to investigate why your tire had low air pressure?

after balancing the redox equation FeCl3+Zn--->ZnCl2+Fe, what are the coefficients, in order from left to right?

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?