Iron nails are often coated with paint or zinc to reduce rusting. Iron usually rust when getting in contact with which of the following?

CO2

H2

N2

O2

A hydrocarbon sample was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from 20.45°C to 23.65°C. The heat capacity of the calorimeter, excluding the water, is 2.21 kJ/°C.

Thorium-234 has a half life of about 25 days. What percent of the thorium will remain after 125 days

Why it is so difficult to discover superiority of nature in creation and maintaining chemical bonds between elements?

According to LeChatelier's principle, if a chemical system in equlibrium is disturbed, the system will react in whatever way increases the amount of reactants and decreases temperature.

Which type of foliated metamorphic rock is an intermediate between slate and schist? A. skarn B. gneiss C. phyllite D. quartzite

Water vapor will condense, turn into a liquid, first on the outside surface of which glass

How many moles of oxygen are needed to make 6.50 moles of magnesium oxide?

Which of the following happens during a chemical change? Check all of the boxes that apply. One atom or more changes into atoms of another element. New substances with different properties are formed. Solids, liquids, or gases may form.

What material was added to powdered rock during tuttle and bowen's experiments?

Which of the following statements is true? Selected Answer: D. At least two of the above statements (A-C) are true. Answers: A. Ions are formed by adding or removing protons or electrons. B. Scientists believe that solids are mostly open space. C.