How many joules of heat energy would be needed to raise the temperature of 248 grams of water from 25.0 degrees Celsius to 55.0 degrees Celsius? The specific heat capacity of liquid water is 4.18J / (C x g)

A group of students performed a human demonstration of a chemical reaction. Jack and Emily sat on a bench. Kevin asked Jack to leave the bench and sat in his place.

2Mg+O2-2Mgo N Synthesis O Decomposition Combustion O Single Displacement O Double Displacement

Identify all of the following that are chemical changes: a. leaves turning color in the fall b. dew forms on a blade of grass c. ethanol evaporates d. sugar dissolves in water e. dry ice sublimes f. charcoal burning

Explain how a hawk or eagle could use convection currents to soar upward without flapping its wings

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Which atom has the largest number of neutrons? phosphorus-30 chlorine-37 potassium-39 argon-40 calcium-40?

A certain indicator has a color chart that shows that when the indicator is yellow, the solution is acidic. What is true about a solution that produces a yellow indicator?

The element hydrogen adom is made up of wich kinds of adams

What type of igneous rock contains large mineral crystals? Explain why.

Why does it require creativity to devise a new atomic model? The atom cannot be seen directly, so scientist must use creativity to interpret information about its structure. It is impossible to test a theory about the atom.