Butter melts when you heat it in a pan or on the stove is this a chemical change or a physical change? how can you tell?

In an experiment, what are the controls? a variable or variables that you manipulate during an experiment a variable or variables for which you cannot account a variable or variables that you must keep constant during an experiment a variable or

What is the identity of a gas that has a density of 1.4975 g/L and a volume of 8.64 L at a pressure of 2.384 atm and with a temperature of 349.6 Kelvin

The electrons lost from the reaction center of photosystem i are replaced by electrons from ___.

Atoms in a stay in a fixed position and have no freedom to move.

What inspired Rutherford to do the scattering experiment?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin