A white solid is heated and is observed to change to a liquid at 65 °C When the liquid is cooled, it becomes a white solid again at 65°C. Is the change chemical or Physical?

1. Which beak shape is best suited for reaching into long narrow flowers? A) short and needle-like B) short and stubby C) long and needle-like D) long and wide

Which change will increase the yield of hydrazine?

The volume of a gas at 17.5 psi decreases from 1.8L to 750mL. What is the new pressure of the gas in arm?

What does Delta S < 0 mean in a reaction?

Water that freezes into ice, thaws back into water, and then freezes again in the cracks of rocks causes which type of weathering A. mechanical weathering B. neither chemical nor mechanical weathering C. hydraulic weathering D. chemical weathering

Which of the following is not a property of a metal? Luster Malleability Permeability Ductility

Ki+cl2 Kcl + I2 Chemical reactions

When the ph of the extracellular fluid declines, the kidneys?

What is created when combustion happens without enough oxygen? a. carbon dioxide b. water c. coal d. soot

What is the term that defines the smallest piece of a crystal that shows the shape of that type of crystal?