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Orlov [11]
3 years ago
10

2. Randy has a 500 g of water at 20°C. If he wants the final temperature of the water to be 75°C (the change in temperature will

be 55°C), how many Joules of heat will he need to add? (Cwater = 4.184 J/(g°C)​
Chemistry
1 answer:
Phantasy [73]3 years ago
7 0

Answer:

115060 J

Explanation:

From the question given above, the following data were obtained:

Mass (M) = 500 g

Initial temperature (T1) = 20 °C

Final temperature (T2) = 75 °C

Change in temperature (ΔT) = 55 °C

Specific heat capacity (C) = 4.184 J/g°C

Heat (Q) required =?

The heat required to change the temperature of the water can obtained as follow:

Q = MCΔT

Q = 500 × 4.184 × 55

Q = 115060 J

Therefore, the heat needed to change the temperature of the water is 115060 J.

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saw5 [17]

Answer:

47.8 g

Explanation:

Remember the equation for percent yield:

% yield = actual / theoretical

We're given two of the values in the question, so plug n' play:

0.945 = 45.2 / theoretical

theoretical = 47.8 g

Keep in mind you can use mass here without converting to moles because we're working with products only. If you were given a mass of reactants, you would need to convert to moles and using a balanced chemical equation find the corresponding moles of product produced.

7 0
3 years ago
The microscopes used today are just like the ones used by Leeuwenhoek and Hooke. True or false
Dmitry [639]

Answer:

False

Explanation:

While we do know that A. Leeuwenhoek used a simple microscope that consisted of only 1 lens, Hooke used a compound microscope. Although, after trying a compound microscope, Hooke found out that it strained his eyes and continued to use a simple microscope for his <em>Micrographia</em>.

Thus, we can say that the (compound) microscopes used today are different than the (simple) microscope used by Hooke and Leeuwenhoek.

6 0
2 years ago
Put the steps in process of photosythensis order
arlik [135]

Answer:

Step 1- CO2 and H2O enter the leaf.

Step 2-  Light hits the pigment in the membrane of a thylakoid, splitting the H2O into O2.

Step 3- The electrons move down to enzymes.

Step 4-Sunlight hits the second pigment molecule allowing the enzymes to convert ADP to ATP and NADP+ gets converted to NADPH

Step 5-The ATP and NADPH is used by the calvin cycle as a power source for converting carbon dioxide from the atmosphere into simple sugar glucose.

Step 6-The calvin cycle converts 3CO2 molecules from the atmosphere to glucose

Step 7-calvin cycle. The second of two major stages in photosynthesis (following the light reactions), involving atmospheric CO2 fixation and reduction of the fixed carbon into carbohydrate.

Hope this helps : D

4 0
3 years ago
What is amount of energy released by the reaction?
Anettt [7]

Answer:

your answer would be 45 because you go up

5 0
3 years ago
How many liters of water would it require to 36 grams of the substance?
Bas_tet [7]

3 liters

________________

3 0
2 years ago
Read 2 more answers
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