Which phrase best describes the effect of a catalyst on a chemical reaction?

Answers

Answer 1

Answer: A catalyst lowers the activation energy of a reaction which makes the reaction happen at a faster rate. The catalyst lowers the activation energy by changing the reaction mechanism. I hope this helps. Let me know if anything is unclear.

Related Questions

Which statement best describes the collisions of gas particles according to the kinetic-molecular theory? a. When particles pass close enough to one another, their attractions pull them together, and then they bounce apart with no gain or loss of energy. b. As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with no gain or loss of energy. c. When particles pass close enough to one another, their attractions pull them together, and then they bounce apart with a loss of energy. d.As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with a loss of energy.
A substance that contains only one kind of matter is known as a(n)A. atom. B. element. C. molecule. D. compound.
While a certain isotope decays, it emits photons. what kind of decay is happening? alpha decay beta decay gamma decay positron decay
A sample composed only of atoms having the same atomic number is classified as(1) a compound (3) an element(2) a solution (4) an isomer
In which pair would both compounds have the same empirical formula? A. H2O and H2O2 B. BaSO4 and BaSO3 C. FeO and Fe2O3 D. C6H12O6 and HC2H3O2

What form of energy provides power for a gas stove?A.nuclear energy
B.electrical energy
C.chemical energy
D.sound energy

Can you explain the answer for me ?

Answers

C . chemical energy will be the answer. In a gas stove, LPG is stored and it is brought out and it reacts with oxygen to give out heat energy. all the other options are not convincing and hence chemical energy is the best answer.

A 10.35g piece of copper metal was heated to 85.5 degrees C and then placed into 23.6g of water. the initial temperate of the water was 18.3 degrees C. what was the final temperature?

Answers

Answer:

$T_F=20.91^(\circ)C$

Explanation:

For this problem we have to start with the heat equation:

$Q=mCp$ ΔT

In which the delta symbol is:

ΔT= $T_f_i_n_a_l-T_i_n_i_t_i_a_l$

All the heat from copper would be transfer into the water, so:

$Q_m_e_t_a_l=-~Q_w_a_t_e_r$

Now, we can identify the variables:

$m~_C_u=10.35~g$

$m~_H_2_O=23.6~g$

$T_i~_C_u=85.5^(\circ)C$

$T_i~H_2O=18.3^(\circ)C$

$Cp~_C_u~=0.385(J)/(g^(\circ)C)$

$Cp~_H_2_O~=4.184(J)/(g^(\circ)C)$

When we put all together in the equation we will have:

$(10.35~g)*(0.385(J)/(g^(\circ)C))*(T_F-85.5^(\circ)C)=-(23.6~g)*(4.184(J)/(g^(\circ)C))*(T_F-18.3^(\circ)C)$

$3.99~T_F-~340=-98.74~T_F+1806.99$

$3.99~T_F+~98.74~T_F=340+1806.99$

$102.72~T_F=2147.68$

$T_F=20.91^(\circ)C$

We know that the heat that escapes the copper metal is equal to the heat that is added to the water bath.

Thus we can use the MC∆T formula to solve for the final temperature
We need to set up the formula for both the change in temperature of the copper as well as the water
thus
Mass(Cu) * Specific Heat capacity(Cu) * (Final temp - initial temp)(Cu) =
Mass(H2O) * Specific Heat of Water(H2O) * (Final - initial temp)(H2O)

Now we can substitute the given info.
specific heat of copper = 0.386 and water is 4.184
10.35g * 0.386 * (x - 85.5) = 23.6g * 4.184 * (x - 18.3)
Now You just need to solve for X. Also remember to take the absolute value of the left side as it will become negative but really the change in heat or ∆H is equal

What is the measurement from the line of origin to the crest? A. Trough
B. Amplitude
C. Crest
D. Wavelength

Answers

Im 90% sure its B amplitude

How many dots are shown in the electron dot diagram for calcium, element number 20?

Answers

2 dots are shown for drawing it. because it has two valence electrons

Two pieces of metal with exactly the same mass are placed on a surface in bright sunlight. The temperature of the 1st block increases by 3°C while the temperature of the 2nd increases by 8°C. If the specific heat of the 2nd block is 0.24 J/g-K, what is the specific heat of the 1st block?

Answers

Answer:

0.64 J/g-K

Explanation:

Solving this question relies on the relization that both blocks receive the same amount of energy but of course their temperature cannot rise by the same amount even if you had the same mass of both because they have different specific heat capacities.

amount of energy received by block 1 = amount of energy received by block 2

specific heat of block 1 * ΔT of block 1 = specific of block 2 * ΔT of block 2

C * 3 = 0.24 * 8

C = 0.64 J/g-K

Ethyne, commonly known as acetylene, is used as a fuel in cutting torches for welding and metalworking. As the torch operates, the ethyne undergoes combustion, as represented by the following equation. 2 C2H2(g) + 5 O2(g) - -> 4 CO2(g) + 2 H2O(g) Calculate the mass of ethyne required to heat 1.50 kg of water 20.0ºC to 42.9ºC.