N-14 = 95%, N-15 = 3%, N-16 = 2%

C-12 = 98%, C-14 = 2%

Write the reaction when solid lead (ii) nitrate is put into water:

How many aluminum atoms are in 2.20 g of aluminum?

How is ice-cream melting a physical change?

Which compound from question 3 would be classified as "organic"? A) H2O b) CCl4 c) NaCl d) Mg3P2 e) N2O5 Why?

Methane, CH4, is a (n) saturated or unsaturated hydrocarbon

Consider the following statements. A. Molecules of hot water have less kinetic energy than those of cold water. B. For most solids, solubility increases when temperature increases. C.

Which describes the fourth state of matter known as plasma? A It is a liquid containing nuclei and electrons. B It is a gas containing nuclei and electrons. C It is a liquid containing electrons created by fusion.

The process of using dna to produce complementary rna molecules is called

A substance contains 36.1 percent calcium and 63.9 percent chlorine by weight. What is the empirical formula of the given compound? A. CaCl B. Ca0.9Cl1.8 C. CaCl2 D. Ca2Cl4

A sample of bismuth weighing 0.687 g was converted to bismuth chloride by reacting it first with HNO3, and then with HCI, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032 g.