Which models are most appropriate for him to use?

The reaction of 2h2+o2-->2H2o + heat is A exothermic B catalyze C liquid reaction D endothermic E none

How many grams of beryllium are in 147 g of mineral beryl?

A sample composed only of atoms having the same atomic number is classified as (1) a compound (3) an element (2) a solution (4) an isomer

Many asteroids are found between Mars and which other celestial body? A. Earth B. Jupiter C. the moon D. the sun

If a star is shown ti be 33.11 trillion killometers away, how many light year would that be

How do i give the number of significant figures in 0.0037 mm

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?