Which of the following processes rearranges atoms during a reaction?

O

burning

O

cooling

O

crushing

O

evaporating

What happens to entropy during this dissolving process.

You measure 2.34 g of K2Cr2O7 into a volumetric flask. You dilute the K2Cr2O7 with water to a volume of 250 mL. It takes 35.7 mL of this solution to titrate 17.8 mL of a solution of Na2C2O4in the presence of excess acid.

What is a substance that cannot be broken down into a simpler substance

What makes the atomic radius change down a column of the periodic table? O A. The greater number of total electrons, the larger the atomic radius. O B. The more valence electrons listed, the larger the atomic radius. C.

Explain the process of fossil creation.

2NO + O2 → 2NO2 What type of chemical reaction is shown above? a combustion reaction b double displacement C synthesis d decomposition e single displacement

Why did Bromophenal solutions change from yellow to blue (what chemical reaction happended) ?

How many milliliters of calcium, with a density of 1.55 g/mL, are needed to produce 85.8 grams of calcium fluoride in the single replacement reaction below? Show all steps of your calculation as well as the final answer.

If object A is placed on the pH scale at pH = 3 and object B is placed at pH = 8, which of the following must not be true? A. Object B has a higher hydroxide ion concentration than object A. B. Object B is closer to a neutral pH than object A. C.

Laboratory safety is not an important concern for scientists. True or false