What is a change in heat energy when 40 g of water at 25°C is raise to 60°C

Describe what you observe when you light a Bunsen burner.

Which statement correctly describes electrochemical cells? A) Electrochemical cells involve only oxidation reactions. B) Electrochemical cells involve only reduction reactions. C) Electrochemical cells involve oxidation-reduction reactions.

In which set of conditions would result in a spontaneous reaction? A. An exothermic reaction; a decrease in entropy; at high temperatures B. An exothermic reaction; an increase in entropy; at any temperature C.

When applying heat to a substance changes the form, but not the identity of the substance, this is evidence of: a chemical change a physical change no change an anthropomorphic change

Na2CO3 + CaCl2 → 2NaCl + CaCO3 How many grams of CaCl2 can be produced from 0.210 moles of Na2CO3?

What effect does the buoyant force have on a submerged object? It causes a net force acting upward on the object. It causes the object to sink in a fluid. It causes the object to float in a fluid. It causes a net force acting downward on the object.

A mixture was found to contain 1.05 g if silicone dioxide, 0.69 g cellulose, 1.82 g of calium carbonate. what percent of calcium carbonate is in thise mixture?

As a water wave nears the coastline, what happens to the height and speed of the wave? A Wave height increases, and wave speed decreases. B Wave height decreases, and wave speed increases. C Wave height increases, and wave speed remains the same.

What does it mean if the salt decomposes to yield a volatile material

The loss of energy from a liquid such as mercury can result in which of the following