an element has atomic number 10 and an atomic number mass of 20. How mamy neutrons are in the atom of this element?

What is the molality of a solution in which 0.42 moles aluminum chloride has been dissolved in 4200 water?

What are the group names call on the perotic table

According to rounding rules for addition the sum of 27.1, 34.538, and 37.68 is

What is the percent by mass of carbon dioxide (CO2) in NaHCO3?

The statement that people who exercise for an hour may have lower cholesterol levels is it a hypothesis, law, or observation?

What is the symbol for heat

When a single 1-gram piece of zinc is added to 3 M hydrochloric acid at 25°C, the reaction is slow. Which procedure would most likely increase the rate of the reaction if the reaction were repeated? A. using 1 gram of powdered zinc B.

Which accurately describes development? A. changing while growing B. growing larger over time C. decreasing the number of cells D. increasing the sizes of cells

A design team has come out with four different plans for building a bridge across a small stream. What is the quickest and most economical way of picking the right plan?

Is a gas that is produced by the ultraviolet radiation in the air in the vicinity of welding operations?