How many nonmetal elements are on the periodic table of elements

Propane (C3 H8 (g), Delta. Hf = - 103.8 kJ/mol) reacts with oxygen to produce carbon dioxide (CO2, Delta. Hf = - 393.5 kJ/mol) and water (H2 O, Delta. Hf = - 241.82 kJ/mol) according to the equation below.

The product of alpha decay of the Nobelium isotope 259No is

What is enthalpy? A. Enthalpy is the heat involved in a reaction. B. Enthalpy is the temperature of a reaction. C. Enthalpy is the mass involved in a reaction. D. Enthalpy is the kinetic energy of a system.

Explain why bridges have expansion joints in them?

Which of the term best describe the developing country? Select the three

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin