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2 years ago

Define a catalyst and explain a catalyst's role in a chemicalreaction.

Chemistry

1 answer:

satela [25.4K]2 years ago

7 0

Answer:

Catalyst is referred to as the substance used in the reaction to speed up or to increase the efficiency of the reaction. the catalyst itself does not alter any change during the reaction. As catalyst itself is not the reactant or product thus it does not appear in a chemical reaction

Explanation:

In a chemical reaction, the catalyst is used to decrease the activation energy thus to provide or enhance the reaction mechanism to the reaction.

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if a solution measured with the miscalibrated meter (above) gave a reading of 6.50 at 20oC, what should be the true pH (give 2 d

Andreas93 [3]

Answer:

Explanation:

Ph is the major of acidity or basicity of a solution. On a scale of 0 to 14

PH = -log 10 ^(H+)

Therefore PH= -log 10^(6.5) =0.81

Therefore PH of the solution is 0.81

This solution is therefore an acidic solution

7 0

3 years ago

How many moles are in 3.0g of A1203?

vfiekz [6]

Answer:

0.065 moles

Explanation:

4 0

2 years ago

Why is pseudo science not considered real science

swat32

Pseudo-science is not considered real science because it is not testable.

Answer: Option A

<u>Explanation:</u>

Pseudoscience primarily includes beliefs, theories or practices that are somehow incompatible with the scientific facts. The pseudoscience can’t be tested on the basis of science.

Let’s take an example of astrology. Some people believe that stars and other celestial bodies draw a significant impact on their life i.e. Good or bad thing it's just because their stars are working either in a positive or negative manner.

But, this belief doesn’t have any well-proved or authentic background over which the whole concept can rely on. Hence, pseudoscience is not taken as a real science as a lack of strong proves.

8 0

3 years ago

What volume (in milliliters) of oxygen gas is required to react with 4.03 g of Mg at STP?

BigorU [14]

Mg reaction with O₂ gas will produce MgO so the equation will be
2Mg+O₂⇒2MgO. (You have to find the equation in order two figure out the number of moles of O₂ that will react with 1 mole of MgO).

The first step is to find the number of moles of Mg in 4.03g of Mg. You can do this by dividing 4.03g Mg by its molar mass (which is 24.3g/mol) to get 0.1658mol Mg. Then you have to find the number of moles of O₂ that will react with 0.1658mol Mg. To do this you need to use the fact that 1mol O₂ will react with 2mol Mg (this reatio is from the chemical equation) so you have to multiply 0.1658mol Mg by (1mol O₂)/(2mol Mg) to get 0.0829mol O₂. From here you would usually use PV=nRT and solve for V However, the question tells us that we are at STP, that means you can use the fact that 22.4L of gas is 1 mol of gas at STP. Using that information we can find the volume of O₂ gas by mulitlying 0.0829mol O₂ by 22.4L/mol to get 1.857L which equals 1857mL.
therefore, 1857mL of O₂ gas will react with 4.03g of Mg.

I hope this helps. Let me know in the comments if anything is unclear.

6 0

3 years ago

Read 2 more answers

Who taught us how planets move?

alexdok [17]

Answer:

It is <u>KEPLER</u>

Explanation:

Kepler defined the sun's orbit.

okay.

6 0

2 years ago