Answer:
Heat of combustion =-7.35 *10² kJ
Explanation:
Step 1: Data given
Mass = 0.176 grams
Molar mass = 28.0 g/mol
Temperature increase 2.12 K
A bomb calorimeter has a heat capacity of 2.18 kJ/K
Step 2: Calculate heat of combustion
Energy released = mass *heat capacity* change in temperature
Q = c*∆T
Q = 2.18 kJ/K*2.12 K = 4.62 kJ released
Heat of combustion = (energy released)/(mole of substance)
Moles of gas = (0.176 g)/(28.0 g/mol) = 0.00629 moles
Heat of combustion = (energy released)/(mole of substance)
Heat of combustion = (4.62 kJ)/(0.00629 moles) = 7.35 *10² kJ
Heat of combustion =-7.35 *10² kJ (negative because heat is lost)
Answer:
The answer that you are looking for is 2 and 8
Explanation:
I got it right on edge 2020
Answer:
Number one is the most acidic, the one in the middle is neutral, and number nine is alkaline.
Answer:
Allison walks 5 blocks west and 3 blocks south.
Explanation:
Vectors have both magnitude and direction. The attached figure shows the graph of Allison’s walk to school. She follows the black vectors to get to her school.
The first vector on the horizontal axis points towards west and there are 5 blocks. Initially, she walks 5 blocks in west direction.
The second vector points in the negative vertical axis. It means that she walks 3 block in south direction.
Hence, the correct option is (D) i.e. Allison walks 5 blocks west and 3 blocks south.
Answer:
The correct answer is d. As the chocolate bar changes from a solid to a liquid the particles move around more.
Explanation:
When a chocolate bar melts, it suffers a <u>physical</u> change: a change of state from solid to liquid. In the liquid state, the particles move around more, because they have more kinetic energy (more velocity) and more freedom to move than in solid state. Thus, as the solid became into a liquid, the particles move more.
