Classify the following change as physical or chemical: A match lights when struck.

A. Physical change

B. Chemical change

Which of the following represents new land formed beneath the plates from divergent boundaries? A. Accretion B. Fault C. Hotspot D. Mid-ocean ridge

A 1.50 L buffer solution consists of 0.118 M butanoic acid and 0.318 M sodium butanoate. Calculate the pH of the solution following the addition of 0.063 moles of NaOH.

A student performs the follow experiment. Step 1: she pours a colorless solution into a beaker that contains another colorless liquid.

What is the colour of FeSo4, 7 H2O crystal how does the colour change upon heating? Give balance equation for the change

The island of spitzbergen is in the arctic ocean, near the north pole. fossils of tropical fruits have been found in coal deposits in spitzbergen. what does this indicate?

Which types of orbitals are found in the principal energy level n = 4? A. S, d B. S, p, d, f C. S, p D. S, p, f E. S, d, f

Transport means to move something from one place to another. True False

What are two reasons that ocean water sinks in the Arctic Ocean? A. The surface water is warmer and less salty than normal. B. The surface water is warmer and more salty than normal. C. The surface water is colder and less salty than normal. D.

Which statement best describes the conductivity of weak electrolytes, such as weak acids and bases? A) Weak electrolytes do not dissolve in water and can not conduct electricity.

Two speakers are placed side by side and are described as having constructive interference. How do you know when constructive interference of sound waves has occurred?