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?

What do non metals do when they ionize

Calculate the density of a block of water measuring 2 cm x 4 cm x 1 cm, with a mass of 5.4

Which of the following is used to separate the parts of mixtures a. Atomic number. B. Physical properties. C. Microscopes. D. Burning

You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 19 quibs of substance called skvarnick.

Which of the following describes a saturated solution? A. One containing 1 g of sugar in 100 mL of water. B. One that contains as much solute as it can hold at a given temperature. C. One that contains less solute than it can hold at 25oC. D.

What is a scientific explanation for a range of hypotheses and observations supported by testing

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong

In which orbital does an electron in a bromine atom experience the smallest?