A sample of hydrated magnesium sulfate has a mass of 4.052 g. After it is heated, it has a mass of 1.979 g. What is the percentage by mass of water in the hydrate?

Will up-vote A mutation is a beneficial change in a gene that is transmitted to offspring. True False

Define and explain each trend. Atomic radius- Electron affinity- Electronegativity- Ionization energy-

Is Sulfur hexachloride an ionic compound?

What solid is brown and red, crumbly and weak in the periodic table (probably a metal)

In which biome do animals have thick layer of fat to keep them warm A. Desert B. Freshwater C. Grassland D. Ocean E. Rain forest

The Florida maple tree is flowering plant. The Florida long leaf pine tree is nonflowering plant. Both trees go through various stages in their life cycles. Which stage is found in the life cycles of both?

The number of different bond angles for the most polar isomer of Pbr2F3 is? A. 7 B. 6 C. 5 D. 8

What is an example of a chemical change? A. water evaporating from a puddle B. cloth tearing when pulled C. wood forming sawdust when cut D. bread baking in an oven

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Choose the correct equation to represent the following statement (unbalanced chemical equation) : ethane reacts with oxygen to yield carbon dioxide and liquid water. a. c2h6 ( g. o2 ( g. co2 (l) h2o ( g. b. c2h6 ( g. o2 ( g. co2 ( g. h2o (l) c.