As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedur
es. They measured the mass of each substance before and after each reaction. The table shows their observations.
Assuming the students did not make any careless errors, what likely explains these changes in mass?
A. Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
B. Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.
C. Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
D. Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants.
Assuming the students did not make any careless errors, what likely explains these changes in mass?
A. Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
B. Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.
C. Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
D. Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants.
2 answers:
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Answer: C. High surface tension
Explanation:
Water has high specific heat as it require high heat to raise the temperature of 1 g of water through .
Surface tension is the net downward force acting on the surface of liquids due to the cohesive nature of liquids.
Water molecules are bonded by strong hydrogen bonding between the hydrogen atom and the electronegative oxygen atom making it polar. Thus water molecules present on the surface are strongly attracted by the molecules present below the surface and thus act as a stretched membrane.
The surface acquires a minimum surface are and thus acquire a spherical shape.