Answer:
Heat change is -14,175 joules, Exothermic
Explanation:
We are given;
- Mass of aluminium bar as 350.0 g
- initial temperature as 70.0 °C
- Final temperature as 25 °C
We are required to determine the heat change and indicate whether endothermic or exothermic;
We know that;
Heat change = Mass of a substance × specific heat × change in temperature
In this case;
Mass of Aluminium = 350.0 g
Change in temperature = (25 - 70)
= -45° C
Specific heat of aluminium = 0.90 J/g°C
Therefore;
Heat change = 350.0 g × 0.90 J/g°C × -45°C
=-14,175 joules
The heat change is exothermic because it is a negative value, also because cooling process involves heat loss and thus an exothermic reaction.
Answer:
Ca2+ represents an ion with 20 protons and 18 electrons.
Explanation:
To find the density, the formula would be d= m/V. Your answer would be 19.9 or if you round, 20.
Answer:
Asexual, they don't require a mate and the mate may have genes that could change the way the plant looks or lives.
Explanation:
