How is a pure substance different from a mixture?

A. Mixtures can be seperated by physical means.

B. Pure substances are made up of mixtures.

C. A pure substance is heterogeneous.

D. A mixture is made of one substance.

Formula for Sodium Hydrogen Carbonate NaHCO3? or Na2HCO3?

Which type of reaction occurs when H + (aq) reacts with OH - (aq) ? O neutralization O decomposition O fermentation O combustion

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A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.

What is the relationship between variable x and variable y? As variable x increases, variable y increases. As variable x increases, variable y decreases. Both variables show a trend toward decreasing values.

Which of the following would be a result of increased solar activity? A. Longer winters B. Warmer-than-normal sea surface temperatures C. Colder-than-normal sea surface temperatures D. Shorter summers

The electron configuration of an element is 1s22s22p63s23p64s1. why is this a representative element?

Why is scientific notation important in chemistry?

During translation, the new polypeptides are often directed to specific parts of the cell by the presence or absence of short sequences of amino acids called signal sequences.

Is potassium iodide an electrolyte or nonelectrolyte?