The sum of the age of brother and sister is 30

Sulfuric acid is essential to dozens of important industries from steelmaking to plastics and pharmaceuticals. More sulfuric acid is made than any other industrial chemical, and world production exceeds 2.0 x 10 kg per year.

What's is a logical way that you could begin to investigate why your tire had low air pressure?

Mark notices he has dropped calls on his cell phone when he walks into his bedroom. his friend told him to try and were wrap aluminum foil around his phone to get better signal Mark talks on the phone 3 times while walking into his bedroom and drops

Which was not an important factor in arranging elements into a periodic table? A. geographic location of first discovery B. atomic number C. properties based on the number of outermost electrons D. atomic mass

Which element could scratch iron?

Which of the following precautions is important when using a Bunsen burner or Meker burner? a. Set up your work space so that wires and cables cannot accidentally make contact with the flame or hot glassware and meltb.

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).