If the chemical properties of a substance have not changed, has a chemical reaction occurred

Which of the following generalized equations best represents a combustion reaction? Question options: AB → A + B fuel + energy → oxygen A + oxygen → energy A + B → AB

The density of a 20.3 m ch3oh (methanol) solution is 0.858 g/ml. what is the molality of this solution? h2o is the solvent. a. 17.4 m b. 20.8 m c. 23.7 m d. 70.0 m e. 97.6 m

A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water? A. 6,150.64 N B. 5,362.56 N C. 7,600.18 N D. 6,700.56 N

Where would sound travel the slowest? Question 3 options: At the equator At the North Pole In New York City In the pine forests of Georgia

Which shows the temperatures of three substances, in order, from greatest to least? water vapor, ice, waterice, water, water vaporwater, water vapor, icewater vapor, water, ice?

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of the solution. What is wrong with this student's approach? Select one: A. You cannot change the pH of a solution. B.

What is more likely to happen if wetlands are drained?

A) If you weigh a hydrated compound before and after heating it. Do you expect the mass to be more or less than before heating? Explain why. b) How about if you weigh a bag of popcorn before and after heating it.

Define the term relative molecular mass

It took many of the metals several minutes to begin to react. Once the reaction was initiated, several of these metals continued to react quite vigorously.