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3 years ago

In what two ways is heat involved in chemical change?

1 answer:

3 0

For a chemical reaction to occur, heat is a very important factor as it helps in speeding up the rate of reaction by increasing the average kinetic energy of the reactant particles. And, reactants must attain maximum activation energy before a reaction can occur and the activation energy is subject to a change in heat applied.

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Convert 0.600 atm of pressure to its equivalent in millimeters of mercury. Express the pressure numerically in millimeters of me

skelet666 [1.2K]

Answer is 456 mmHg.

Explanation;

This is a simple unit conversion problem.

1 atm = 760 mmHg

Hence,

0.600 atm = (760 mmHg / 1 atm) x 0.600 atm

= 456 mmHg

Pressure can be measured by using many units such as atm, Pa, torr, bar, cmHg, mmHg and so on.

The relationships among those units as follows

1 atm = 101325 Pa = 1.01325 bar = 760 torr, 760 mmHg = 76 cmHg

8 0

3 years ago

The reaction represented by this graph is an exothermic reaction. According to the graph, which statement is true? Reactants hav

Sunny_sXe [5.5K]

Answer:

Reactants have more energy than products

Explanation:

Generally, in an exothermic reaction heat is released. In other words, energy is released. So you start with reactants which have a set amount of stored chemical energy, and you lose some in the reaction. Since energy is 'leaving', the stored chemical energy in the products is less than what we started with in the reactants. When given a graph, you can tell this is true because going from left to right, the line representing the stored chemical energy will start at a higher level than where it ends.

7 0

3 years ago

Read 2 more answers

The setup in the diagram is left outside during the day and night . Bubbles are continuously produced regardless of the presence

Angelina_Jolie [31]

Answer:

Explanation:

6 0

3 years ago

When 4.21 grams of potassium hydroxide are added to 250 mL of water in a coffee cup calorimeter, the temperature rises by 4.14°C

Schach [20]

Answer:

The molar heat of solution of potassium hydroxide = 57.7 kJ /mol

Explanation:

Step 1: Data given

Mass of potassium hydroxide = 4.21 grams

Volume of water = 250 mL

Temperature rise = 4.14 °C

Density = 1g/mL

Specific heat = 4.184 J/g°C

Step 2: Calculate the heat absorbed by water

q = m*c*ΔT

⇒ with m = the mass of water = 250 grams

⇒ with c= the specific heat of the solution = 4.184 J/g°C

⇒ with ΔT = 4.14 °C

q = 250 * 4.184*4.14 = 4330.4 J

Step 3: Calculate moles of KOH

Moles KOH = Mass KOH / Molar mass KOH

Moles KOH = 4.21 grams / 56.106 g/mol

Moles KOH = 0.075 moles

Step 4: Calculate molar heat of solution

4330.4 J / 0.075 moles = 57738.7 j/mol = 57.7 kJ /mol

(Note that the enthalpy change for the reaction is negative because the reaction is exothermic)

The molar heat of solution of potassium hydroxide = 57.7 kJ /mol

6 0

4 years ago

What is the acceleration of a 7 kg mass being pulled by a 56 N force?

maw [93]

Answer:

8 meters per second per second

Explanation:

Newton's second law: $f=ma$ , force = mass multiplied by acceleration.

Therefore 56 / 7 = acceleration = 8

7 0

3 years ago