Michelle was cooking a pizza and removed the pizza from the oven which was set to 204 degree Celsius. She wanted to cool down the pizza as soon as possible to eat it. In her house she had a freezer (-18 degree Celsius) a refrigerator (4 degree Celsius) a countertop (room temperature) WHAT IS THE INDEPENDENT, DEPENDENT AND CONTROLLED VARIABLE?

Independent variables are the devices.

The Dependent variable is the rate of cooling.

There is no controlled variable.

Explanation:

Independent variable is required to be changed to observe its impact on the dependent variable. The controlled variable is kept as a standard for experimentation process.

Independent variable are the temperatures of different devices which were used to cool down the pizza.

Dependent variable is the rate of cooling of the pizza.

Controlled variables: No control variables are set in this experiment.

And Plz MARK AS BRANILIST

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.