1. When calcium is added to water, it reacts with the water to form calcium hydroxide and hydrogen gas. The hydrogen gas is released into the air, reducing the mass of the beaker and its contents. Therefore, the mass of the beaker at the end is less than 105g.
2. When calcium oxide is added to water, it reacts with the water to form calcium hydroxide. This reaction does not release any gases, so the mass of the beaker and its contents remains the same at 105g.
1. 5g of calcium is added to 100g of water in a beaker. the mass of the beaker at the end is less than 105g. explain why.
2. 5g of calcium oxide is added to 100g of water in a beaker. the mass of the beaker at the end is 105g. explain why it has not changed.
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