Which statement about human activity and the environment is NOT true?

If the farmer plants the same crop in a field year after year the soil becomes less fertile what causes this decrease in fertility

In general, as you move from right to left across a period, the number of valence electrons

Why is water a covalent bond

What is the pH of a 3.5 * 10-11 M H + solution?

What does a safety symbol showing an apron mean? poisonous chemicals protective clothing must be worn fire hazard electrical hazard

A housefly's average life span is 3 days. How many minutes is that

The elements in Groups 1 AU) and 7A (17) are all quite reactive. What is a major difference between them?

A certain radioactive element has a half-life of one hour. if you start with 1.0 gram of the element at noon, how much of the radioactive element will be left at 2 p. m.? 0.50 grams 0.25 grams 0.125 grams 0.0 grams

Name two bases which react with dillute sulfuric acid to give zinc sulfate

What is the correct name for the compound nh4clo4?