A chemical change is a change in composition resulting in a product with different properties.  True  False

Use the equation in the Example box on page 34 of the lab manual to answer this question. For a 100 gram plant food sample in which you recovered 75.0 g of NH4 MGPO4 * 6H2O, how many grams of P2O5 was present in the 100 g sample. | 75.0 g O 14.5 g O 21.69 g 7.23 g

39.5 g of cobalt will combine with 107 g of bromine to form a binary compound. How much of the same compound can be formed from the reaction of 250.0 g of cobalt with the right amount of bromine?

Suppose you have a bucket of sand containing 1.5 billion grains of sand ( 1.5×109 grains). Most of the grains of sand are white, but there are some brown grains mixed evenly throughout. If the concentration of brown sand is 4.0% , how many grains of brown sand are in the bucket?

Br CF3CH,OH

Solid calcium chloride is formed by the reaction of chlorine gas and solid calcium . Write a balanced chemical equation for this reaction.

Consider these compounds: A. Caz(PO4)2 в. Ваз (РОд)2 C. Cuco3 D. Pbso4 Complete the following statements by entering the letter(s) corresponding to the correct compound(s). (If more than one compound fits the description, include all the relevant compounds by writing your answer as a string of characters without punctuation, e.g, ABC.) Without doing any calculations it is possible to determine that calcium sulfite is more soluble than is less soluble than and calcium sulfite by simply comparing Kap values. It is not possible to determine whether calcium sulfite is more or less soluble than please explain

Chemistry An element consists of 4.35% of an isotope with mass 49.946 u, 83.79% of an isotope with mass 51.9405 u, 9.50% of an isotope with mass 52.9406 u, and 2.36% of an isotope with mass 53.9389 u. Calculate the average atomic mass, and identify the element. Average atomic mass = u Element:

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When a log completely burns in a campfire, the mass of the ash is much less than the mass of the log. What happens to the matter that composed the log?