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Water (H2O) is not considered to be an element because -
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
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?
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
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
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
Which of these proves that photosynthesis involves a chemical change?
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
How many elements are in the chemical formula for silver difluoride, AgF2?
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
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
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
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
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
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?
B it can be broken down into simpler substances.
B The temperature of the mixture increases 4⁰C.
C Chemical reaction
D The fact that carbon dioxide forms other molecules
B. 2
C Formation of water
A reacts chemically to form new substances when heated.
A A chemical reaction between iron and oxygen
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