Can magnetism be used to identify a substance

What is the pH of a solution with [H ] = 1.25'10-10?

Which of the following objects require the use of a small - scale model

Number of atoms in sodium chloride

If an athlete runs at a speed of 12.9 km/hour, how long will it take the athlete to run a marathon (about 42.2 km) ? Express your answer in hours using the correct number of significant figures. Do not enter your answer using scientific notation.

Select the pair of bodies which are most alike in composition and size A. Earth and Venus B. Meteor and comet C earth and Neptune D. Asteroid and comet

Which of these are ionic compounds?

Which property can be defined as the ability of a substance to be hammered into thin sheets

Select the group of organelles that is common to both plant cells and animal cells. A. nucleus, cytoplasm, ribosomes, chloroplasts B. cell wall, ribosomes, cell membrane, mitochondria C. cytoplasm, mitochondria, cell wall, nucleus D.

A compound is found to have a composition of 70.4% carbon and 29.6% hydrogen, by mass. what is the empirical formula for the compound?

As you go down a family or group on the periodic table * the atoms become smaller and smaller. the elements become less reactive. the elements become more reactive. the atoms have more and more valence electrons.