500.0 g of acetone is heated from –100.0 °C to 60 °C. How much heat (in kJ to two decimal places) is required for this process

Answers

Answer 1

Answer:

Answer: The amount of heat required for this process is 172.5 kJ.

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A solid magnesium flare has a mass of 1300 g and a volume of 743 cm3 what is the density of the magnesium

Answers

Answer:

$density = 1.75 g/cm^3$

Explanation:

As we know that the mass of the magnesium is given as

mass = 1300 g

volume of the magnesium is

volume = 743 cubic cm

so we will have

$density = (mass)/(volume)$

so we will have

$density = (1300)/(743)$

$density = 1.75 g/cm^3$

Calculate the maximum kinetic energy of photoelectrons emitted from this plate when light of wavelength (λ) 520nm is directed at the metal surface.Work function (Ф) of the plate = 1.1 × 10⁻¹⁹ J
Planck's constant (h) = 6.63 × 10⁻³⁴ Js
Frequency (f) = c ÷ λ
c = speed light in vacuum = 3.00 × 10⁸ms⁻¹
Ekmax = hf - Φ

Wavelength must be in metres, so it'll be 590×10⁻⁹

I've worked this out and gotten two different answers so I thought I'd check to see which one is right.

Answers

Well for a start, 520nm is 520 nanometres and for some reason you've called it 590 x10^-9 (590 isn't standard form) where it's actually 5.2 ×10^-7 metres.
Put that into the equations:
f = c/λ = 3.0 x10^8/5.2 ×10^-7 = 5.77 x10^14 (3 s.f.)
(5.77 x10^14) x (6.63 x10^-34) - (1.1 x10^-19) =
2.73 x10^-19 J

A scientific model can be used to _______.a. replace study of the actual system
b. better understand systems and processes
c. complicate ideas
d. all of the above

Answers

The idea to have scientific models it is to be used in order to better understand systems and procesess. So the answer you are looking for is option B. Hope this is useful

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