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

Which is the next logical step in balancing the given equation? N2 + O2 → NO2 Place the coefficient 2 in front of oxygen and nitrogen dioxide. Place the coefficient 3 in front of oxygen and nitrogen dioxide. The equation is already balanced.

Calculate the enthalpy of the reaction h2 (g) f2 (g) → 2hf (g) using bond enthalpies and compare this value to the result obtained by using the standard enthalpies of formation.

Given four particle models: which two models can be classified as elements?

Moving up trophic levels there is an increase in energy, entropy, and biomass. a. True b. False

What force will act on a sled to make it slide down a hill?

You would know you were in the troposphere If? It were raining on you You were floating in space You were flying in a high altitude jet You were in the ozone later

A burning match is an example of a chemical change phase change nuclear change physical change

The table below shows the shapes of two samples, C and D, when placed in three containers of different shapes.

How many grams of KCl are produced when 60 grams of K are reacted?

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