The number 4012 has how many significant figures?

Write a word equation for 2ZnS (s) + 3O2 (g) - > 2ZnS (s) + 2SO3 (g)

how do scientists use geologic time to determine age of landforms

An atom becomes negatively charged by

Estimate the heat released when ethene (CH2=CH2) reacts with HBr to give CH3CH2Br. Bond enthalpies are: C--H : 412 kJ/mol; C--C : 348 kJ/mol C=C : 612 kJ/mol; C--Br : 276 kJ/mol; Br--Br : 193 kJ/mol; H--Br : 366 kJ/mol.

Oxidation is the gain of electrons. Oxidation is the gain of electrons.

What genetic engineering issue is of greatest public concern? A. It may create new varieties of food. B. It may create new medicine. C. It may create new opportunities for research. D. It may create new allergies in humans

Diamonds are more expensive than water because a. markets do not always reflect value. b. they have fewer uses. c. they yield higher marginal utility. d. they yield higher total utility. e. all of the above

Which of these events is caused by contact forces?

What happens when hydrochloric acid is added to pure water?

1. Water is an amphoteric substance. In any sample of water some of the moles In any sample of water some of the molecules perform acid- base reactions with each other. This is called the autoionization of water.