What causes bread dough to rise?

a. ethanol

b. carbon dioxide

What is the momentum of a 66-kilogram ice skater gliding across the ice at a speed of 7 m/s

An unbalanced chemical equation is shown: 2NaN3 → 2Na + N2 Which of the following statements explains why the equation is not balanced? (a. Four molecules of N2 should be produced during the decomposition. (b.

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot?

How do chemists change hydrocarbons into other compounds

Sodium tends lose a single electron in natural settings. Based on what you know, what are two other elements that tend to do the same thing?

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