Blood is forced through the body by the

(1) brain

(2) lungs

(3) heart

(4) stomach

Write a balanced equation for the reaction between sulphuric acid and potassium hydroxide

What is the name of the element with a valence electron configuration of 4s24p3?

What is the mole fraction of N, in the mixture?

On We Wily problems as directed. She 24. An unknown liquid has a mass of 30.6 g 2 and a volume of 52.3 mL. What is the density of the liquid?

The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.765 and the molar absorptivity coefficient is 86,300 M-1cm-1.

What has more thermal energy, 200 g of water at 40 degrees Celsius or 1000 g of water at 30 degrees Celsius

If the density of a certain spherical atomic nucleus is 1.0x10^14 g cm^-3 and its mass is 2.0x10^-23 g, what is it radius in cm?

How many protons, neutrons and electrons are in an atom of magnesium-24?

If there is losts of pollution, what happens?

How does the structure of the pencil relate to its function?