How many atoms are in a sample of 72.8 grams calcium?

1. What is the probability of rolling a five on one die three times in a row? 2. The allele for a cleft chin, C, is dominate among humans. Using a punnet square, what are the results of a cross between parents with genotypes Cc and cc

Cuales son los nombres de los siguientes iones NH4+1 Y NO3-1

What does it mean if a pure substance is an additive?

Which of the following is true in regard to ions? A. A cation will hold a positive charge if it gains one or more electrons. B. An ionized atom has a number of protons that is unequal to the number of electrons. C.

Why would there be a concern with glaciers melting because of global warming? A. because it could lead to the ocean currents warming up B. because it could lead to an abundant amount of marine life C.

The heart is an example of which level of organization within an organism? O cell organ tissue organ system O O

NaOH+HCl--> NaCl+H2O what is the total number of grams of H2O produced when 116 grams of the product, NaCl, is formed?

Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

You have a balloon containing 1 L of air at STP in a vacuum chamber. What will the volume of the balloon be when you reduce the pressure by half and increase the temperature to 373 K?

Which method will correctly determine whether the forces on an object are balanced or unbalanced? A. Multiply the forces in the horizontal direction by the forces in the vertical direction. B.