Answer:
if your title doesn't have enough information, make a list of the key words ... If you are not sure what should be included in each summary sentence, use ... Often you can present the hypothesis and the supporting reasoning in one paragraph. ... Describe specific parts of the procedure or data that contributed to your learning.
Explanation:
Kinetic Energy= 0.5 times velocity squared times mass
So KE= 0.5times 150 times 40 squared
(Use a calculator)
And don't forget units
Answer:
319.3g Cu2S
Explanation:
There is 127.1 g Copper in 159.16g (molar mass) of Cu2S. Let x be Cu2S required. Then x * (127.1/159.16) = 255.0g. So x = 319.3g
Answer: The oxygen gas has a pressure of 4 atm if my volume decreases to 1 L.
Explanation:
Given: = 2 L, = 2 atm
= 1 L, = ?
Formula used to calculate the new pressure is as follows.
Substitute the values into above formula as follows.
Thus, we can conclude that the oxygen gas has a pressure of 4 atm if my volume decreases to 1 L.
Answer:
⁵⁸Fe
Explanation:
mass number of the isotope = number of protons + number of neutrons
mass number of the isotope = 26 + 32 = 58 a.m.u
a.m.u - atomic mass units
Knowing that the element have 26 protons and 26 electrons it have to be an isotope of iron.
⁵⁸Fe