Which processes can be used as evidence to identify the formation of a new substance?

Which of the following is only true about a compound (not both true about elements and compounds)?

A silver spoon tarnishes

Water spreading into hydrogen and oxygen.

Sugar cube dissolving in water.

Grinding something into powder

Leaves changing color in the fall.

Dry ice goes from the solid form to the gas form of CO2

Mixing flour, salt, and sugar

Which of the following is a compound?

The chemical formula for glucose is C6H12O6, and the symbol for Hydrogen is H. Glucose is the product of photosynthesis and is a simple sugar. Based on this.....which statement is false?

What do the letters Na and Cl represent in the chemical formula NaCl?

Look at this chemical equation: 8CO+17H2.......Which substance in the above equation represents an element?

During a science class investigation, a teacher places a small amount of sugar in a spoon and heats it over a candle. Which of the following would be the best evidence that a change in chemical properties of sugar has taken place?

Two substances mix together. Which of the following does not identify the formation of a new substance?

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