Worksheet for Lesson 1: Measuring Matter - Mass, Volume, and Density.

Here is the solution to the worksheet, with explanations for each answer:

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1. What is matter?
✔ Correct Answer: B. Anything that has weight and takes up space.

Explanation:
Matter is defined as anything that has mass (which we often perceive as weight on Earth) and occupies volume (takes up space). This includes solids, liquids, gases, and even things you can’t see like air. Option A is wrong because matter *does* have weight (due to gravity). Option C is incorrect because not all matter is visible (e.g., oxygen gas). Option D is false — many things without a fixed shape (like liquids or gases) are still matter.

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2. What's the difference between weight and mass?
✔ Correct Answer: C. Mass is how much matter is in something, and weight is how strongly gravity pulls on it.

Explanation:
Mass is a measure of the amount of matter in an object and does *not* change regardless of location (Earth, Moon, space). Weight is the force of gravity acting on that mass — so your weight changes if you go to the Moon (less gravity), but your mass stays the same. Option A swaps the definitions. Option B is false — they are related but not the same. Option D is backwards — mass doesn’t change, weight does.

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3. Which one of these is a unit used to measure volume?
✔ Correct Answer: C. Milliliters

Explanation:
Volume measures how much space something occupies. Milliliters (mL) are a standard metric unit for measuring liquid volume. Grams and kilograms measure mass. Newtons measure force (including weight). So only milliliters is correct for volume.

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4. How can the volume of an irregularly shaped object like a rock be measured?
✔ Correct Answer: C. Using a graduated cylinder

Explanation:
You can measure the volume of an irregular object using water displacement. Fill a graduated cylinder with water, note the level, submerge the rock, and note the new level. The difference in volume is the volume of the rock. A ruler won’t work for irregular shapes. A scale measures mass, not volume. And yes, it *can* be measured — so D is wrong.

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5. What happens when you put oil and water together in a container?
✔ Correct Answer: C. The oil floats on top of the water.

Explanation:
Oil is less dense than water, so it floats on top. They do not mix because oil is nonpolar and water is polar — “like dissolves like.” Oil doesn’t sink (B), and while water can evaporate over time, that’s not the immediate result (D). So C is correct.

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✔ Final Answers:

1. B
2. C
3. C
4. C
5. C

Let me know if you’d like a printable version or further clarification!