Question

Please can someone help with my questions asap

Answer 1

A chemical reaction is carried out in a closed container. The energy absorbed by the chemical reaciton is 100kl. What is the energy liberated from the air or the walls of the container?
75kl
25kl
50 kl
100kl
Which of the following measures the energy transferred from one object to another?
Mass
Heat
temperature
volume
In a calorimeter, 1.0 kg of ice melts at 0 degrees C. The enthalpy of fusion of the ice is 334J\g. How much heat was absorbed?
334J
33.3J
334kj
33.4 kj
What is the change in enthalpy when 250 g of water vapor condenses at 100 degrees C
-291kj
291kj
565kj
-565kj
How much energy is realeased when 16.5 g of steam is condensed at 100 degrees C
-37290 J
-3729 J
-136 j
-13 KJ
How much heat is required to convert 74 grams of ice at -4 C into 74 grams of water at 52 C?
606J
24,716J
4000J
41,406 J
Which element has the following electron configuration?
1S^22S^22P^63S^23P^4
Sodium
Nitrogen
Sulfur
Chlorine
Of the following elements, which one would have the largest radius
Nitrogen( N atomic #7
Lithium( Li atomic #3
Neon( Ne atomic #10
Boron( B atomic #5
C3H8+5 O2----> 3CO2+4H20
This is an example of a
combustion
decomposition
double replacement reaction
single replacement reaction
synthesis