Which of these is an exothermic reaction?

A. melting an ice cube

B. frying a egg

C. baking muffins

D. burning a log

Why is a layer of pollution in the air more visible in winter than summer

Your friend drops your house keys down to you from their second floor window. If you catch them 2.4 m from where your friend dropped them, what is the velocity of the keys when you catch them? a. -6.9 m/s c. -7.2 m/s b. -6.5 m/s d. -7.4 m/s

1. For each situation, determine the net force acting upon the object. Situation A Situation B Tfnorm = 3 N = 3 N Ffrict = 5 N app = 5 N Ffrict = 5 N gray = 3N ray = 3 N Situation C Situation D "norm = 20 N Fair = 40 N 20 N gray = 25 N

A wave with a frequency of 60.0 Hz travels through steel with a wavelength of 85.5 m. What is the speed of this wave

The Tapeats Sandstone is made of sand-sized rock pieces and contains fossils of trilobites. Trilobites were marine organisms similar to modern-day horseshoe crabs.

What is the half life of each of these radioactive isotopes? a radioactive isotope decreased to one-fourth its original amount in 18 months.

What would be the most likely charge of an ion formed from an atom with the electron configuration: 1s22s22p5 +1 -1 +3 -3

How many degrees is in the centre of the sun

How to write 0.23000 in scientific notation

When an 81.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.25 103 j. by how much does the potential energy of a (n) 17.