I’m pretty sure it’s D. Hope that helps! Correct me if I am wrong.
Answer:
change of color
Explanation:
when a substance undergoes a change of color it is an indication that it was chemical
Hi my dear friend,
The atoms, ions, or molecules that make up the solid or liquid are very close together. There is no space between the individual particles, so they cannot pack together. ... Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles.
~Thank you
The reaction is a synthesis…

… because <em>two substances are combining to make one other substance</em>.

It is also a <em>reduction-oxidation reaction</em> because the <em>oxidation number of Al increases</em> from 0 to +3 and the <em>oxidation number of O</em> decreases from 0 to -2.
Answer:
1. The heat energy in Joules is 5280.22J
2. The heat energy in calories is 1261.4 calories
Explanation:
Step 1:
Data obtained from the question.
The following data were obtained from the question:
Mass of water (M) = 74.2 g
Initial temperature (T1) = 24°C
Final temperature (T2) = 41°C
Change in temperature (ΔT) = T2 - T1 = 41 - 24 = 17°C
Heat energy (Q) =?
Recall:
Specific heat capacity of water = 4.186 J/g°C
Step 2:
Determination of the energy in Joules.
This is illustrated below:
Q = MCΔT
Q = 74.2 x 4.186 x 17
Q = 5280.22J
Step 3:
Conversion of the heat energy in Joules to calories. This is illustrated below:
4.186 J = 1 calorie
Therefore, 5280.22J = 5280.22/4.186 = 1261.4 calories