Is a marshmallow turning black when toasted a physical or chemical change?

A sample of ideal gas is in a sealed container. The pressure of the gas is 565 torr torr, and the temperature is 3 ∘C∘C.

Calculate the mass of o2 produced by the decomposition of kclo3 by heating in the presence of manganese dioxide

Mass of pennies is 26.0g and final volume is 54 mL. What is density of pennies?

Diets high in trans and what other type of fatty acid contribute to chronic diseases, including heart disease and cancer?

How is a gas formed?

How many moles are in 25.2g of KMnO4?

Lewis diagram of Ozone

Name the feature of the ocean floor shown at A and describe how it's formed.

A certain element consists of two stable isotopes. The first has a mass of 62.9 amu and a percent natural abundance of 69.1 %. The second has a mass of 64.9 amu and a percent natural abundance of 30.9 %. What is the atomic weight of the element?

Nonmetals rarely lose electrons in chemical reactions because?