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Harman [31]
1 year ago
15

Is each of these statements true? If not, explain why.(m) For most reactions, ΔH°rnx is lowered by a catalyst.

Chemistry
1 answer:
barxatty [35]1 year ago
3 0

A  catalyst reduces H°rnx in most reactions. The answer is false

<h3>Do catalysts reduce delta H?</h3>

By reducing the activation energy required for the reaction to occur, a catalyst just modifies the route used to go from reactants to products. However, because it doesn't alter the state of the products or reactants, delta H is unaffected.

A catalyst reduces a reaction's activation energy, enabling a chemical reaction to occur. The number of reactant particles with energy above the activation energy increases as the temperature of a reaction rises.

learn more about catalyst refer

brainly.com/question/12507566

#SPJ4

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When 3.0 kg of water is warmed from 10 °C to 80 °C, how much heat energy is needed?
Naddik [55]

Answer:

THE HEAT NEEDED TO CHANGE 3KG OF WATER FROM 10 C TO 80 C IS 877.8kJ OR 877,800 J.

Explanation:

Mass = 3.0 kg = 3 * 1000 = 3000 g

Initial temperature = 10 C

Final temperature = 80 C

Change in temperature = 80 - 10 = 70 C

Specific heat of water = 4.18 J/g C

Heat needed = unknown

Heat is the amount of energy in joules needed to change a gram of water by 1 C.

Heat = mass * specific heat * change in temperature

Heat = 3000 g * 4.18 J/g C * 70 C

Heat = 877 800 Joules

Heat = 877.8 kJ.

The heat needed to change 3 kg mass of water from 10 C to 80 C is 877,800 J or 877.8 kJ.

6 0
3 years ago
HELP!!!!! ASAP!!!!! PLZ!!!!!
lesya692 [45]

1. Lemon juice (pH 2.2) = Acidic

2. Salt solution (pH 7) = Neutral

3. Baking soda (pH 9) = Alkaline

4. Bleach (pH 13) = Alkaline

5. Tomato juice (pH 4) = Acidic

6. Gastric juices (pH 1) = Acidic

<h3>Explanation: </h3>

The pH scale measures how acidic or alkaline a substance is. The pH scale ranges from <u>0 to 14.</u>

A pH of 7 is neutral.

Acidic substances have pH less than 7.

Alkaline(Base) substances have a pH greater than 7

Hence, the given samples can be categorized as acidic, basic or neutral based on their pH values.

1. Lemon juice (pH 2.2 < 7) = Acidic

2. Salt solution (pH 7 = 7) = Neutral

3. Baking soda (pH 9 > 7) = Alkaline

4. Bleach (pH 13 >7) = Alkaline

5. Tomato juice (pH 4 < 7) = Acidic

6. Gastric juices (pH 1 < 7) = Acidic

6 0
4 years ago
Can someone help me name this hydrocarbon?
ser-zykov [4K]
2-ethyl-4,4 -dimethyl hex-1-ene.
3 0
3 years ago
4. Define power and explain how to determine power.
Ratling [72]
The rate of doing work is called power of an object.
It is also defined as the work done by an object per unit time. Mathematically, its formula is given by :
, W is work done and t is time taken.
The SI unit of power is watts and its commercial unit is kWh.
1 watt = J/s or N-m/s.
5 0
3 years ago
Which one of the following substances should exhibit hydrogen bonding in the liquid state?
Sonja [21]

Answer:

What are the following substances?

Explanation:

8 0
3 years ago
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