You are using a calorimeter to calculate the specific heat capacity of a metallic ore. The calorimeter contains 0.50 kilograms of water at room temperature (22 °C). We heat the ore in boiling water and then drop the metal into the calorimeter and wait for the water and metal to reach the same temperature. The mass of the ore is 3.5 kilograms. We find that the water has increased in temperature to 24.3 °C. Recall that the specific heat of water is 4.18 J/g–°C. Calculate the specific heat capacity of the ore.
Answers
the specific heat capacity of the ore : 0.018 J/g°C
Further explanation
In the calorimeter, the heat received is the same as the heat released
Q abs = Q release
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Q released by a metallic ore and absorbed by water at calorimeter
Q ore = Q water
- Q water
m = 0.5 kg = 500 g
c = 4.18 J/g–°C.
Δt = 24.3 - 22 = 2.3
- the specific heat capacity of the ore.
Q ore = Q water = 4807 J
m ore = 3.5 kg = 3500 g
Δt = 100 - 24.3 = 75.7
Related Questions
Decomposition of potassium chlorate are performed in the lab to make oxygen. You are strictly advised to be careful with it. Why is that, what might happen?
How can a scientist assess whether a pure niobium (Nb) sample is responsible for contaminating the lab with radioactivity? Test the niobium sample to see whether it now contains other elements.Test the niobium sample for the presence of niobium oxide compounds.Heat the niobium, and see if the level of radioactivity in the lab increases.Place the niobium under pressure, and see if the level of radioactivity in the lab increases.
Which of the following is NOT a natural toxin that can contaminate food?a. Ciguatera b. Methyl Mercury c. Aflatoxins d. Dioxins
What is the balanced chemical equation for caffeine?
Answers
So now 5,098,000.
Now we need to move the decimal over to make this problem greater than 1 and less than 10. So if we but the decimal Right after 5 we have 5.098 which is greater than 1 and less than 10.
So now we write it out like this
5.098*10^x
let's find x.
X is how many times we moved the decmal over, in this case 6.So now
5.098*10^6
Does this help?
a. Jupiter → Uranus → Mars → Mercury
b. Mars → Venus → Earth → Mercury
c. Neptune → Saturn → Jupiter → Uranus
d. Uranus → Jupiter → Neptune → Saturn
Answers
Answer:
The correct answer is option A, Jupiter → Uranus → Mars → Mercury
Explanation:
Time taken by Jupiter to make one rotation = 9h 56m
Time taken by Uranus to make one rotation = 17h 14m
Time taken by Neptune to make one rotation = 16h 6m
Time taken by Mars to make one rotation = 1d 0h 37m
Time taken by Earth to make one rotation = 23 hours, 56 minutes, and 4 seconds
Time taken by Saturn to make one rotation = 0d 10h 42m
Time taken by Venus to make one rotation = 116d 18h 0m
Time taken by Mercuryto make one rotation = 58d 15h 30m
Thus the correct order is option A,
Jupiter (9h 56m)< Uranus(17h 14m)< Mars(1d 0h 37m) <Mercury (58d 15h 30m)
Answers
scratch test
All matter is composed of very small particles called atoms.
All atoms of a given element are identical.
Atoms cannot be created, destroyed, or subdivided.
Atoms combine with or separate from other atoms.
Atoms combine with each other.
Answers
1) all elements are made up of atoms.
2) atoms are so small that they cannot be divided any further.
3) an atom can neither be destroyed nor be formed.
4) atoms of an element are similar, they posses same mass and same properties.
5) atoms of different elements combine in a definite ratio to form compounds.
Due to further experimentation it was concluded that atom is made up of small particles identified as proton, neutrons, and electrons. They can be further subdivided.
Another change is the presence of isotopes of atoms of different elements. Hence, atoms of the same element can also have different masses.
Answers
pOH = -log(8.6 x 10 ^-5)
pOH = 4.07
To calculate the pH we use the relation of pOH and pH, expressed as:
14 = pOH + pH
pH = 14 - 4.07 = 9.93
pH = -log [H+]
[H+] = 10^-9.93 = 1.16 x 10^-3 M
Answers
volume
For the sake of explanation, let's pretend the mass is 2g and the volume is 1 ml
Density = 2 g = 2 g/ml
1 ml
Now if we increase the volume, and leave the mass the same then mass is still 2g, but we can increase the volume to 2 ml
Density = 2 g = 1 g/ml
2 ml
Therefore we can say that if volume increases and mass stays the same, then density will decrease.
ρ = m/v
Let's plug in some numbers to see how this looks, we'll say the object weighs 1 kg and it's volume is 2 cm^3
Thus, ρ = 1 kg / 2 cm^3
So, density in this case is equal to 1/2 kg for every cm^3.
Now let's increase the volume and keep the mass. We'll double the volume.
ρ = 1 kg / 4 cm^3
Now the density comes out to 1/4 kg for every cm^3, which is obviously less.
We've come to the conclusion, then, that as volume increases and mass stays the same, density decreases. Therefore volume and density are inversely proportioned.
This makes sense mathematically, but does it make sense if we just think about it? It invariably does.
What is density? Density is just how much mass is stuck in a certain space. As such, when you increase that space, but keep the mass, the mass will be more sparsely distributed.
Think of it like this, you've a small room filled to the brim with toys, should you increase the room size, but keep the same amount of toys, then the toys would be further spread apart.
It is the same way with mass and volume.
Hope this helps :)