¿cuál de los siguientes no acelera a una reacción?
a. alta temperatura
b. más superficie
c. baja presión de aire
d. catalizador

The correct answer is B).

Explanation:

The factors that accelerate a chemical reaction are:

- Temperature: at a higher temperature, the speed of a reaction is increased.

- Pressure: the higher this is, the greater the collisions between molecules and an acceleration of the reaction speed will occur.

-Catalysts: correspond to substances that accelerate chemical reactions, an example are enzymes. There are catalysts that increase the reaction rate and others that generate the opposite effect (they are inhibitors).

There are also other factors that accelerate a chemical reaction such as the concentration of reagents.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles