Answer:
Q = 1.5 kJ
Explanation:
It is given that,
The specific heat for aluminum is 0.900 J/g°C
Mass of sample, m = 3.8 g
Initial temperature,
Final temperature,
We need to find the heat released. The amount of heat released is given by the formula:
or
So, the correct option is (A) i.e. 1.5 kJ.
The molecular shapes which have the most electron pairs (both shared and unshared) around the central atom are linear-shaped.
<h3>What are molecular shapes?</h3>
The molecular shapes are the shapes like linear, trigon planner, octahedral, tetrahedral, etc. which depend on the number of atoms and the lone pair and bond pair of atoms.
In linear shape, a maximum number of electrons take part in the hybridization and can also have lone pairs to give repulsion to the bond pairs of the atoms and only 2 electrons take part in bond formation.
Therefore, linear-shaped are the molecular shapes that have the most electron pairs (both shared and unshared) around the central atom.
Learn more about molecular shapes, here:
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Answer:
The exposed metal rusts is an example of a chemical change because rust is an example of a chemical change in objects for example bicycles, scooters, etc.
Answer:
Explanation:
People who use marble to carve monuments and sculptures are always concerned because it can easily chemically weather.
Marble is a metamorphic rock derieved from limestone. The minerals that makes up limestone are calcite and dolomite. When a metamorphic transformation occurs, the rock is subjected to intense temperature and pressure. Marble is made of calcite and dolomite minerals.
Rain water dissolves carbon dioxide to form weak carbonic acid. This weak carbonic acid can easily dissolve marble thereby defacing the monument and the sculpture.
Answer:
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Explanation:
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