Which organism lived on Earth during the Precambrian time? A. fern B. dinosaur C. cyanobacteria D. octopus

Which group of elements are the most reactive

Infer: Is the reaction below possible? Explain why or why not. H2O + NaOH NaCl + H2

Noble gases are especially stable because A) They have equal numbers of protons and electrons B) They have more neutrons than protons C) The outer energy level (valenc electrons) is full with 8 electrons D) They have even numbers of protons Bonding

Name the following compounds: (a) KH2PO4, (b) K2HPO4, (c) HBr (gas), (d) HBr (in water), (e) Li2CO3, (f) K2Cr2O7, (g) NH4NO2, (h) HlO3, (i) PF5, (j) P4O6, (k) Cdl2, (l) SrSO4, (m) Al (OH) 3

Which statement is true about this reaction? 14N + H-50 It is a practical source of energy on Earth. It occurs only outside the solar system. Its product is heavier than each of its reactants. It shows the critical mass of an element.

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda