Which best describes an element? a. a pure substance b. a type of mixture c. a pure compound d. an impure substance

How are reactants converted to products in an elementary reaction?

Suppose the heat of neutralization had ben determined using a glass beaker instead of a polystyrene coffee cup. how would the measured value have been affected?

The slope of a distance-versus - time graph shows an object's? A. time of travel B. none of the other answer choices C. distance traveled D. speed

An earthquake's magnitude is a measure of the

Volcanoes are a source of this, but a bigger source in human activity. What is the thing?

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer

20 Which statement describes a reversible reaction at equilibrium? (1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.

Count the total number of atoms in CaCO3: 2 3 4 5 6

Question #21TrueFalse The general name for a substance added to a reaction that affects the rate but is not consumed in the reaction is called a complex a. True b. False

what kinda energy is produced when a force causes a substance to vibrate, and the energy is transferred through the substance in a wave.