Other Chemistry Answers

A solid piece of limestone (CaCO₃) is reacted with 1.0 mol/L sulfuric acid at 25°C. To decrease the number of effective collisions (rate), you could: *

1 point

1. Use sulfuric acid with a concentration of 0.5 mol/L
2. Add a catalyst
3. Increase the temperature to 27°C
4. All of the above
5. Use powdered calcium carbonate

1.) If 202.5 g of mercury has a volume of 15cm³, what is the density of mercury?

2.)If the density of silver is 10.5g/cm³, what would be the mass of a silver whose volume is 9cm³?

25.00 mL of 6.00 M H2SO4 solution is diluted with water to a volume of 2.000L. What is the [H+] and [OH-] of the resulting solution?

A calorimeter that contains 3.6 L of water is used to measure the enthalpy of solution for 45 g of KOH. Calculate the molar enthalpy of solution that is associated with the reaction if the temperature of the water changes from 25.5 °C to 20.7 °C. [The molar mass of KOH is 56.10 g/mol]  *

If two or more compounds are composed of the same two elements then the ratio of the masses of the second element that is combined with a certain mass of the first element is always a ratio of small while numbers. This statement is called the law of what

how long does it take for oxygen to mix with hydrogen to make water

100 g of a liquid at 25 °C is heated to raise its temperature to 50.0 °C. The thermal energy gained by the liquid is 6100 J. The specific heat capacity of the liquid is:

1. 2.44 J/g°C
2. 2.06 J/g°C
3. 2.02 J/g°C
4. 2.00 J/g°C
5. 0.82 J/g°C

Which of the following is the correct formation equation for ethanamine?

1. 4C(g) + 7H₂(g) + N₂(g) ---> 2C₂H₅NH₂(g)
2. C(g) + H₂(g) + N₂(g) ---> C₂H₅NH₂(g)
3. 4C(s) + 7H₂(g) + N₂(g) ---> 2C₂H₅NH₂(g)
4. C(s) + H₂(g) + N₂(g) ---> C₂H₅NH₂(g)

For which one of the following substances is the standard enthalpy of formation equal to

zero

1. Pb(l)
2. H₂O(l)
3. CO₂(s)
4. CO(l)
5. H₂O(g)

In a calorimetry experiment, if the temperature of the water decreases, then the reaction is? 

1. not enough information
2. endothermic
3. exothermic
4. energy neutral (ΔH=0)