44 points! Will medal!3. A calorimeter contains 500 g of water at 25°C. You place a hand warmer containing 200 g of liquid sodium acetate inside the calorimeter. When the sodium acetate finishes crystallizing, the temperature of the water inside the calorimeter is 39.4°C. The specific heat of water is 4.18 J/g-°C. How much energy was needed to heat the water?
Answers
A calorimeter contains 500 g of water at 25°C.....
the temperature of the water inside the calorimeter is 39.4°C.....
The specific heat of water is 4.18 J/g-°C.
energy needed to heat the water = specific heat * mass * temp difference
= 4.18 J/g-°C * 500 g * (39.4°C - 25°C)
= 4.18*500*14.4
= 30096J
or approx. 30kJ
Energy=specific heat of water x mass of water x water's temperatures
=4.18x500x(39.4-25)
=30096J
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Answers
Answer: The correct answer is alpha particle.
Explanation:
There are 3 radioactive particles which are released in radioactive decay process:
1. Alpha particle: This particle is released when a nuclei undergoes alpha decay. The particle released has a mass of 4 units and has a charge of 2 units. The particle is positively charged.
2. Beta-particle: This particle is released when a nuclei undergoes beta decay process. The particle released has a mass of 0 units and has a charge of (-1) units.
3. Gamma radiations: These radiations are released when an unstable nuclei undergoes gamma ray emission and gives excess energy by a spontaneous electromagnetic process. The radiations does not carry any charge and has no mass.
Hence, the radioactive particle that is charged charged and has two protons and two neutrons is the alpha particle.
Answers
Answer:
density = 2g/cm³
Explanation:
density = mass/volume
mass = 20g
volume=10cm³
density=20g/10cm³
density = 2g/cm³
Final answer:
The density of the object is 2 g/cm³. This value expresses how much mass the object has per unit of volume, which in this case is cubic centimeters.
Explanation:
The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is 20 g and its volume is 10 cm³. Therefore, the density of the object can be calculated as follows: density = mass/volume = 20 g/10 cm³ = 2 g/cm³.
This value implies that this object has 2 grams of mass per cubic centimeter of volume. This is a commonly used unit of density in physics for measuring small objects. A higher density usually indicates that an object is more compact or has more mass relative to its volume.
Learn more about Density here:
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Answer:
c or d it measures smallest to biggest and biggest to smallest
Answer:
your answer is a
Explanation:
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Answer:
A.
Explanation:
The amount of mass always stays the same, matter cannot be created nor destroyed, it can only change forms. Thus, the answer is A.
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
I hope this helps..
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Answer:
It allows migration of ions from one half–cell to the other.
Explanation:
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Sawing a board in half is a physical change not a chemical change the board doesnt change wood or whatever material it is is still would still be wood
If it were burned it would be a chemical change but its properties stay the same atomically so thats why its not a chemical change.