Which of these proves that photosynthesis involves a chemical change?

Two liquids of the same temperature are mixed in an open beaker to produce one liquid that has escaping gas bubbles. The gas produced is evidence of what event?

A teacher brings a child’s wagon to school for students to observe. The wagon is made mostly of iron. Some areas on the wagon are shiny, red, and smooth, while other areas while other areas are rusted, orange and rough. What caused some of the

A white powder is mixed with 200 mL of water. Which of these observations would show that mixing the powder and water produces a chemical reaction?

Students place 5g of table sugar into a test tube and hold the bottom of the test tube just above a flame for a short time. The sugar bubbles and releases a white gas as it turns from white to yellow to brown. Based on this evidence, the students

Water (H2O) is not considered to be an element because -

When a student mixes oxygen and hydrogen gas in a test tube, nothing seems to happen. However, when the student introduces an electric spark, the mixture “pops” and water forms on the inside of the test tube. What is the best evidence for this chem

Which of the chemical equations shown below is balanced?

How many elements are in the chemical formula for silver difluoride, AgF2?

When a student lowered the temperature of a glass of water below 0⁰C, the water turned into ice. Later the student heated the ice and it turned back into water. Why must this be

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