Earthworms are classified as what type of worm

Suppose a new element is discovered and it has two stable isotopes. One isotope has a mass of 73.942 u and an abundance of 38.92%. The average atomic mass of the element is 73.970 u. What is the mass of the second isotope?

Bromine has chemical properties most similar to ... A. fluorine B. potassium C. krypton D. mercury

Who's does an atom become a positively charged ion? A. by gaining one or more electrons B. by gaining one or more neutrons C. by losing one or more electrons D. by losing one or more neutrons

What is the biological significance of the temperature at which the amylase catalyzed reaction

If the mass of a substance is 113.45 g and the volume of the same substance is 14.8 mL, what is this substance's density using correct significant figures?

A) What are the postulates of Bohr's model of an atom? (b) Show diagrammatically the electron distributions in Sodium, Lithium and Aluminium atoms

How many liters of air are in a room that measures 10.0 ft * 11.0 ft and has an 8.00 ft ceiling? 1 in. = 2.54 cm (exactly); 1 L = 103 cm3

Which of these represents a chemical change? A) two compounds combining to form a mixture B) a mixture being separated into two elements C) a compound being separated into two elements D) an element changing state from solid to liquid

What properties would have caused early researchers to name hydrogen "inflammable air"

Enter the symbol of a sodium ion, Na+, followed by the formula of a sulfate ion, SO42-