When a certain poisonous gas is combined with a chemically active metal, a fine white powdery substance results. The
new substance is neither poisonous nor
chemically active. Is the powder a mixture or
a compound? How do
you know?

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.