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marin [14]
3 years ago
6

A metal ball of mass 100 g is heated to 90°C and then cooled to 25°C. The heat lost in the process is 2.5 kJ. Another metal ball

of mass 200 g is heated to 90°C and then cooled to 25°C. The heat lost in the process is 5.0 kJ. What can be concluded from the data?
A) The balls are made of the same material.
B) The first ball is made of a material with a higher specific heat.
C) The second ball is made of a material with a higher specific heat.
D) The specific heat of one of the balls is two times that of the other.
Chemistry
2 answers:
Harrizon [31]3 years ago
7 0

Answer:

A. The balls are made of the same material

erica [24]3 years ago
6 0

Answer:

A) The balls are made of the same material.  

Explanation:

Q= m c delta T

where Q is heat, m is mass, c is specific heat capacity and delta T is the difference in temperature.  

When c and delta T are held constant, heat is directly proportional to the mass.  

Here  both the metal balls have the same delta T, and as the mass of the ball double so does the heat lost, this implies that both the balls are made up of the material and have the same specific heat capacity.  

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What element has 4 valence electrons and 5 electron shells?
marta [7]

Answer:  Tin (Sn)

Explanation:  The electron configuration for tin (Sn) is shown in the picture.  It's last electrons are:

5s^2 4d^10 5p^2

The valence electrons are in the 5th electron shell and include 2 each in the 5s and 5p orbitals.

8 0
3 years ago
Platinum crystallizes in a face-centered cubic cell. the density of platinum is 21.4 g/cm3. calculate the radius of the platinum
IgorLugansk [536]
1 mole of platinum has a mass of 195 g therefore 1 atom will have a mass of 195 g /(6.02 ×10^23) = 3.239 × 10^-22 g
Density is given by dividing mass by volume, thus to get volume, mass is divided by density. 
The volume = (3.239 × 10^-22)/21.4 
                    = 1.514 × 10^-23 cm³
But volume of a sphere is given by 4/3πr³
Therefore, r³ = 3.6129 × 10^-24 
                 r   = ∛(3.6129 × 10^-24)
                      = 1.534 × 10^ -8 cm
Therefore, the radius of the platinum atom is 1.534 × 10^-8 cm

7 0
3 years ago
Why might a major volcanic eruption lead to cooler temperatures over a large area around the volcano ?
Readme [11.4K]
The dense aerosol cloud created caused decreases in the amount of solar radiation that reached the Earths surface.
5 0
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William measures a test tube and finds that the mass of the test tube is 5g. He places the lone reactant in the test tube and fi
iogann1982 [59]

86 percent is the percent yield for this experiment if he expected to produce 5g of product.

Explanation:

Given that:

mass of test tube = 5 grams

mass of test tube + reactant is 12.5 grams

mass of reactant = ( mass of test tube + reactant ) - (mass of test tube)

mass of reactant = 12.5 -5

                             = 7.5 grams

when 7.5 grams of reactant is heated mass of test tube was found to be 9.3 grams.

so mass of product formed = 9.3 - 5

                                             = 4. 3 grams of product is formed (actual yield)

However, he expected the product to be 5 grams (theoretical yield)

Percent yield = \frac{actual yield}{theoretical yield} x 100

          putting the values in the formula:

percent yield = \frac{4.3}{5} x 100

                     = 86 %

86 percent is the percent yield.

5 0
3 years ago
If a 130-kg car is traveling at a velocity of 23 m/s, what is the kinetic energy of the car?​
AnnZ [28]
KE = 1/2 * m * v^2
KE = 1/2 * 130 * 23^2
KE = 34385J
3 0
3 years ago
Read 2 more answers
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