Pergunta

What do these two changes have in common? boiling an egg newly poured concrete becoming hard Select all that apply. Both are only physical changes. Both are chemical changes. Both are caused by cooling. Both conserve mass.
Solução

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MaysaElite · Tutor por 8 anos
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B. Both are chemical changes.<br />D. Both conserve mass.
Explicação
## Step 1<br />The problem asks us to identify the commonalities between two processes: boiling an egg and newly poured concrete becoming hard. <br /><br />## Step 2<br />The first option suggests that both processes are only physical changes. However, this is not accurate. Boiling an egg involves a chemical change as the proteins in the egg undergo a transformation due to the heat. Similarly, the hardening of concrete is also a chemical change as the components of the concrete react to form a solid structure.<br /><br />## Step 3<br />The second option suggests that both processes are chemical changes. This is correct. As mentioned above, both processes involve a change in the chemical composition of the substances involved.<br /><br />## Step 4<br />The third option suggests that both processes are caused by cooling. This is not accurate. Boiling an egg is caused by heating, not cooling. The hardening of concrete is caused by a chemical reaction, not cooling.<br /><br />## Step 5<br />The fourth option suggests that both processes conserve mass. This is correct. According to the law of conservation of mass, the total mass of the substances involved in a chemical reaction remains constant, regardless of the physical state of the substances.
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