Within a physical change, an element can change forms, such as going from solid to a liquid through melting. Color change can also occur during a physical change. Physical changes are very different from chemical changes. In a chemical change the element itself changes into something else within a reaction, such as combustion (burning).
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Answer:
55,000,000
Explanation:
550 hectometers [hm] = 55,000,000 millimeters [mm]
False. A buffering solution consists of a WEAK acid such as CH3COOH, C5H5N, or ammonia. <span>A buffering solution resists pH change upon the addition of an acidic or basic components. It can neutralize little amounts of added acid or base, thus maintaining the pH of the solution relatively stable. The correct answer is letter "B. false"</span>
<span>The simplest unit of matter that still retains the properties of an element is an "Atom".
Atom is the smallest particle of any unit that actually can exist retaining the properties of an element. </span><span />
