Which of the following are supported by many observations

A - hypothesis

B - laws

C - theories

What number of atoms of phosphorus are present in 1.00g of each of the compounds in exercise 48?

During which stage of a scientific investigation is it most useful to organize information in graphs and tables? A. research related information B. identify a problem or need C. analyze the results D. design an investigation

Phase changes are chemical changes. True False ... ?

Which expression is equal to the number of milliliters (mL) in 12.5 liters (L) ?

An element x has two naturally occurring isotopes: X-79 (abundance+50.69%, mass + 78.918amu) and X-81 (abundance+49.31% mass+80.917amu). Calculate the weighted atomic mass of X.

Which combination of protons neutrons and electrons is correct for the isotope of copper - 63?

What is the purpose of a domain?

What is the ideal gas constant? A. It is a constant that applies only at STP. B. It is a specific constant for a particular gas. C. It is a universal constant used for all gases. D. It is a constant that depends on the conditions.

The greenhouse effect is a result of the Sun's energy being absorbed by objects on the Earth and converted into which type of radiation? A) Radio B) Visible C) Infrared D) Ultraviolet

Which was the limiting reactant: the zinc or the hydrochloric acid? Remember that the limiting reactant is completely consumed in a reaction and no new product is formed unless more of the limiting reactant is added.