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QR Challenge: Chemistry

QuestionAnswer
Why did it take so long for scientists to prove that matter was made of atoms?Scientists couldn't see them, so they had to come up (slowly) with experiments that showed how atoms were designed.
What part of the atom did each of the following discover?2Thompson - electron, Rutherford - nucleus, Chadwick - neutrons2
Why doesn’t matter usually exist in the plasma state on Earth?3Not hot enough3
Why do atoms of liquids allow them to flow?4Because the molecules that the atoms make up can move past each other; they are not in a rigid configuration4
What is sublimation?5The process by which a solid turns directly into a gas (skipping the liquid state).5
List five physical properties of a pencil.6Six-sided, a graphite center, yellow color, wooden, rubber eraser, marks on paper, lightweight, etc.6
What are two chemical properties of iron?7Iron combines with oxygen to form iron oxide (rust) and has extra electrons left over when it forms a metallic bond.7
Suppose a geologist finds a mineral that is unknown to him or her. Which type of property would he probably use first to identify the sample? Explain.8Physical properties, because they are visible.8
Describe three physical changes you could do to a piece of chalk.9Break it, dissolve it with vinegar, dip it in red paint, rub it so that it is square and not cylindrical.9
Is dissolving a teaspoon of salt in a glass of water a physical or chemical change? Explain.10Physical. What happened to the salt is that it dissolved, but it did not cease to be salt.10
Explain why a burning piece of paper quits burning.11There are no more materails to combine with oxygen and burn.11

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