Answer:
D. -1882J
Explanation:
We can solve the energy released in a chemical reaction in an aqueous medium using the equation:
Q = -m*C*ΔT
<em>Where Q is energy (In J),</em>
<em>m is mass of water (45.00g)</em>
<em>C is specific heat of water (4.184J/g°C)</em>
<em>And ΔT is change in temperature (25.00°C - 15.00°C = 10.00°C)</em>
<em />
Replacing:
Q = -45.00*4.184J/g°C*10.00°C
Q = -1882J
Right answer is:
<h3>D. -1882J</h3>
<em />
Answer: It depends on the element.
Explanation: Every element has a different amount of protons in its nucleus. It is the same as its atomic number on the periodic table. For example: Hydrogen has an atomic number of 1 because it has 1 proton in its nucleus, Helium has 2, Carbon has 6, Platnium has 78, and so on...
Answer:
2.95 g / mL
Explanation:
For this problem, we will simply use the equation that density is equivalent to mass over volume. We are given the mass of the object and the initial and final volumes of water in the cylinder. Thus we can find the density as such:
Density = Mass / ( Final Volume - Initial Volume )
Density = 3.689 g / ( 8.54 mL - 7.29 mL )
Density = 3.689 g / ( 1.25 mL )
Density = 2.9512 g / mL
Hence, the density of the object is 2.9512 g / mL.
Cheers.
