Answer:
I'll answer below
Explanation:
22.- HCl + Na₂S
23.- H₂S + NaCl
24.- 2HCl + Na₂S ⇒ H₂S + 2NaCl
26.- alfa They don't penetrate very deeply into the skin, in fact, clothing can stop alpha particles.
beta penetrate clothing and skin.
gamma can travel through most forms of matter because they have no mass. It takes several inches of lead or several feet of concrete.
27.- Fission and fusion are two processes that release too much amounts of energy.
28.- Well, I could be because in a formula we write first the metal and later the non metal.
29.- The elements that are most likely to have similar properties are Y and Z, that's because they have the same valence electron. All the elements with they same valence electron have similar properties.
Answer: Hence the energy change is -1918 kJ/mol
Given:
Initial temperature of calorimeter T1 = 25 C
Final temperature T2 = 29 C
Heat capacity of calorimeter c = 4.90 kJ/C
Mass of sucrose (m) = 3.5 g
Molar mass of sucrose (M) = 342.3 g/mol
To determine:
The energy change for the combustion of sucrose in kJ/mol
Explanation:
The change in temperature of calorimeter = T2 -T1 = 29 - 25 = 4 C
Heat gained by the calorimeter when the temperature changes by 4 C is-
= 4 C * 4.90 kJ/ 1 C = 19. 6 kJ
Now,
Heat gained by calorimeter = heat lost during combustion of 3.5 g sucrose = -19.6 kJ
# moles of sucrose = 3.5 g/342.3 g.mole-1 = 0.01022 moles
Energy change for the combustion reaction = -19.6/0.01022 = -1917.8 kJ/mol
As you may know some objects float others do not, this is because some objects contain air or oxygen. for example an orange with a peel floats because the peal contains oxygen and an orange without a peel sinks because it does not contain air at oxygen
If the object is not at rest how?
Answer: Electromagnetism and sound
