In the chemical formula 2no2, how many atoms of oxygen (o) are there? 2 3 4 5

A nuclear power technician determines that the fission rates need to be increased. Which of these tasks will the technician most likely carry out?

Use the periodic table to select the element that best fits each of the following descriptions. which element below has properties of both metals and nonmetals? zinc aluminum copper boron

Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?

Choose the correct order of electron structures from largest to smallest. A. principal energy level, sublevel, orbital, electron B. orbital, sublevel, principal energy level, electron C. electron, orbital, sublevel, principal energy level D.

A 3.585 g sample contains carbon, 1.388 g of h, 1.850 g o, and the molar mass is 62.00 g. what is the molecular formula for this substance?

What explains the fact that no machine is 100 percent efficient? A. Friction transforms mechanical energy into thermal energy. B. Thermal energy is transformed into mechanical energy by friction. C.

For each example of a phase change, identify whether heat is absorbed from the surroundings or released into the surroundings. A popsicle melts on a hot day. Rubbing alcohol evaporates from the surface of the skin.

How are scientific questions answered?

How much heat is required to increase the temperature of 100.0 grams of iron from 15.0oC to 40.2oC? (The specific heat of iron is 0.46 J/g xoC).

An adhesive dealer receives an order for 3000 lb of an adhesive solution containing 13% polymer by weight. On hand are 500 lb of 10% solution and very large quantities of 20% solution and pure solvent.