One molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen. write the formula for caffeine with the elements in the order they are given.

An acid solution has a pH value of 5. Which of these statements correctly describes the acid? a It is a dilute acid b It is a weak acid c It is a strong acid d There is not enough information to determine strength or concentration.

50 ml decimolar H2SO4 when mixed with 50 ml decimolar NaOH then normality of resultant solution is?

The atomic mass of an element depends on what?

A 3.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific test site. The half-life of the radioactive element is 28 years.

When baking a cake and it appear to have ripples on its top what is the problem?

Why is a solution not a pure substance? A The solute and solvent cannot be separated. B It is made up of one substance. C It is a mixture between a solute and a solvent. D It is made up of two substances that are chemically combined.

Triangle PQR has vertices at P (-6,-4), Q (2,-10), and R (8,0). It is dilated about the origin by a scale factor of 5 to obtain triangle P′Q′R′.

Hypothesis: If a fixed amount of gas is heated, then the volume will because the heat will cause the molecules of gas to move

I) Distinguish a substance from a mixture. Give 2 examples of each

Chemical reactions are used to produce a variety of products, such as