Practice Test 2 - 5th Grade Science
20 questions. Answer them in any order, then submit to see your score and every explanation.
- Marcus melted a 40 g chocolate bar in a sealed bag; how did total weight compare after melting?
- Students want to find out if mixing baking soda and vinegar creates a new substance. Amir's plan says: Purpose—see what happens when 1 tbsp baking soda is mixed with 30 mL vinegar in a clear cup. Safety—wear goggles, no tasting, and work on a tray. Procedure—(1) Observe each substance before mixing. (2) Mix and watch for bubbles and temperature change. (3) Record observations in a data table and clean up. Which observation would provide the best evidence that a new substance formed?
- Maya measured liquids: graduated cylinder showed 50 mL, 75 mL, 50 mL; thermometer showed 20°C, 25°C, 15°C; balance showed masses in grams. Which tool measured the liquids' volume?
- The data show Cassiopeia and Orion; what pattern is supported for Cassiopeia?
- A kitten drinks milk; the kitten uses energy from food for what?
- The diagram shows a feather and a rock held at the same height above the ground labeled "Earth." Both have arrows pointing downward labeled "Gravity pulls down." Which statement is true about gravity's pull?
- Which best describes what "down" means on Earth at any location on the surface?
- Plants get most matter from air/water (~93%); soil gives small minerals (~7%). Which is correct?
- A student says, "Plants grow because they eat soil." But a plant's mass is mostly made from water and carbon dioxide, while minerals are needed in small amounts. Which of these provides the main materials for plant growth?
- A model of photosynthesis shows plants use water from roots and carbon dioxide from air to make sugars that become plant tissues. Sunlight provides energy but is not matter. What do plants need to make new plant material?
- A 100-gram plant (dry mass) is about 45 g carbon from CO₂ in air, 42 g oxygen from water and CO₂, and 6 g hydrogen from water—93 g total from air and water. Only about 7 g comes from soil minerals. What does this data demonstrate about plant matter?
- According to the data, which material best matches the unknown? Oak wood: brown, 80g, not magnetic, floats, medium hardness. Aluminum: silver, 100g, not magnetic, sinks, hard. Iron: gray, 200g, magnetic, sinks, hard. Cork: tan, 25g, not magnetic, floats, soft. Unknown: brown, 78g, not magnetic, floats, medium hardness.
- Looking at the properties, how are Rock A and Rock B similar in more than one way? Rock A: gray, hard, rough, 50 g, not magnetic, sinks. Rock B: reddish-brown, medium hardness, smooth, 35 g, not magnetic, sinks.
- Students measured ice and water: thermometer showed 0°C, 5°C, 22°C, 40°C, 80°C; balance showed 100 g ice became 100 g water. Which tool measured 80°C?
- Using the property data, identify the unknown material by matching all measured properties. Reference materials: - Oak wood: brown, 80 g, not magnetic, floats, medium hardness - Aluminum: silver, 100 g, not magnetic, sinks, hard - Iron: gray, 200 g, magnetic, sinks, hard - Cork: tan, 25 g, not magnetic, floats, soft Unknown material: brown, 78 g, not magnetic, floats, medium hardness.
- Why does an object fall on Earth when you drop it, but astronauts can float when they are far out in space?
- Where does a squirrel get energy in this model: Sunlight → Oak tree → Acorns → Squirrel?
- In the example, the Sun looks brightest; what does that show about distance and stars?
- Using the data, which argument best explains the direction of gravity near Earth? Data: Students dropped a rubber ball at three different places. - In the classroom: the ball fell toward the floor. - On the playground: the ball fell toward the ground. - On a hill: the ball fell toward the ground below.
- When you drop a book and a crumpled paper from the same height, both move toward the ground. What evidence best supports the idea that gravity causes falling? Observation: As soon as you release them, both start moving downward.