Which of the following will result in a chemical change?

A. Burning coal in a furnace

B. Drying wood in a shed

C. Melting ice to obtain water

D. Evaporating alcohol into vapor

Where will you find maximum rate of evaporation - ocean, pond or an aquarium? Give reason to support your answer.

Karl puts a piece of ice in a small plastic bottle without a cap, and finds that the mass of bottle and ice is 18.1 g. Several hours later he finds that the mass of the bottle and water is 17.8 g.

Which of the following changes is an exothermic chemical change Boiling water Melting ice Chopping wood Fireworks exploding

1. Classify each of the following as a homogeneous or heterogeneous substance. a. iron ore b. quartz c. granite d. energy drink e. oil-and-vinegar salad dressing f. salt g. rainwater h. nitrogen

What type of solid is this? This solid is hard and depends on charge attractions to hold it together. Metallic, network, molecular, ionic, or amorphous?

Which base has the lowest ionization constant (Kb) ? A) HCl B) NaOH C) bleach D) blood

What is the name of the compound that has the formula N2O? a. nitrogen oxide b. dinitrogen oxide c. nitrogen dioxide d. dinitrogen monoxide

10) What does mRNA copy and carry the code to produce? (1pt) a) DNA b) Proteins

How many neutrons are in an atom of molybdenum-96 (Mo-96)

One mole of any gas takes up how much space at stp