A Change in matter that can be seen through direct observation are called?

Which of the following processes has an increase in entropy? A) Boiling a pot of water B) Freezing a sample of water C) Filtering sand out of a sample of water D) Synthesizing water from hydrogen and oxygen

How much heat is required to evaporate a gram of water at room temperature?

CuCl2 + Al - - - > AlCl3 + Cu Balance the single replacement chemical reaction. A) CuCl2 + Al - - - > AlCl3 + Cu B) 3CuCl2 + 2Al - - - > 2AlCl3 + 3Cu C) 2CuCl2 + 3Al - - - > 3AlCl3 + 2Cu D) 3CuCl2 + 3Al - - - > 3AlCl3 + 3Cu

A weather forecast shows 35 m/h on the weather map. Which weather component does this number represent? A. Humidity B. Precipitation C. Wind direction D. Wind speed

Which of the following statements is not a description of Saturn? Known for its rings Largest planet in the solar system One of the gas giant planets Has several moons

Which equation represents alpha decay

The composition of rocks affects their densities and the densities of Earth's layers. Use what you have learned and the information in the table to answer the question.

How many cells are needed to form an organism?

In each row, the box under the compound that can reasonably be expected to be more acidic in aqueous solution, e. g. have the larger Ka. H2 TeO4 H2TeO3 HClO2 HClO HClO HBrO

You are doing chores to earn your allowance. For each chore you do, you earn $3.00. What is the independen variable?