A sealed jar holds 200 grams of water. Ava adds 20 grams of salt, closes the jar, and shakes it until the water looks clear. What should the balance read?

A covered container reads 150 grams with dry soil inside. Elena adds 50 grams of water and snaps the lid shut. What should the balance read after mixing?

A sealed bag reads 80 grams with sand inside. Noah adds 40 grams of gravel, seals the bag again, and gently mixes it. What should the balance read?

A closed bottle reads 100 grams with oil inside. Mia adds 25 grams of water, closes the bottle, and the liquids form layers. What should the balance read?

A lidded cup reads 60 grams with water inside. Jay adds 5 grams of drink mix, closes the cup, and stirs until it dissolves. What should it read?

A jar on a balance reads 300 grams with water inside. Priya adds 30 grams of salt, closes the jar, and shakes it. What should the balance read now?

A closed tub reads 75 grams with flour inside. Luis adds 25 grams of sugar, snaps on the lid, and shakes the tub. What should the balance read?

A covered cup reads 90 grams with beans inside. Sara adds 10 grams of rice and closes the cup before mixing. What should the balance read afterward?

A closed container reads 180 grams with water inside. Ben adds 20 grams of sand, closes it tightly, and shakes it. What should the balance read?

A lidded jar reads 70 grams with iron filings inside. Kim adds 30 grams of sand, closes the lid, and mixes them. What should the balance read?

A closed bottle reads 250 grams with syrup inside. Omar adds 50 grams of water, tightens the cap, and shakes the bottle. What should the balance read?

A lidded cup reads 110 grams with water inside. Zoe adds 15 grams of sugar, closes the cup, and stirs until it looks clear. What should it read?

A closed bin reads 500 grams with gravel inside. Diego adds 100 grams of soil, locks the lid, and rolls the bin gently. What should the balance read?

A closed cup reads 90 grams with water inside. Leah adds 10 grams of salt and closes it before stirring. What should the balance read afterward?

A sealed bag reads 35 grams with salt inside. Theo adds 65 grams of sand, seals the bag, and shakes the mixture. What should the balance read?

A lidded jar reads 120 grams with water inside. Nia adds 30 grams of salt, closes the jar, and stirs until no grains are seen. What should it read?

Milo weighed a lidded jar before and after mixing sand and gravel. The jar read 450 grams both times. What does this result show?

A closed cup read 210 grams before sugar dissolved in water and 210 grams after the water looked clear. What does this evidence show?

A class mixed 40 grams of dry soil with 60 grams of water in a closed bag. The bag contents were 100 grams after mixing. What does this show?

Oil and water separated into layers in a capped bottle. The bottle read 275 grams before shaking and 275 grams after shaking. What does the result show?

Salt was stirred into water in a closed jar until no grains could be seen. The jar's mass did not change. Where is the salt now?

A muddy water jar read 160 grams before and after it was shaken with the lid on. What conclusion does this evidence support?

Kai wants to test whether dissolving sugar in water changes mass. Why should he keep the lid on the cup the whole time?

A capped plastic bottle of water read 250 grams. After the water froze into ice, the bottle still read 250 grams. What does this evidence show?

A sealed bag of crackers read 60 grams. Kai crushed the crackers into tiny crumbs without opening the bag. The bag still read 60 grams. What does this show?

A closed jar of powder and water read 180 grams before shaking and 180 grams after the liquid changed color. What does this result show?

A ball of clay read 120 grams. Jen rolled it into a long, thin snake and weighed it again. It still read 120 grams. What does this show?

Max weighed a flat basketball. He pumped it full of air and weighed it again. It read a few grams more. What does this show?

Lena dropped a fizzing tablet into water and quickly capped the bottle tightly. It read 150 grams right away and still 150 grams after the bubbles stopped. What does this show?

A sealed jar of cold water read 300 grams. After it sat in the warm sun all afternoon, it still read 300 grams. What does this show?

An open beaker of salt water read 210 grams on Friday and 190 grams on Monday. No one poured it out. Where did the missing mass most likely go?

Steel wool is sealed in a jar with some air. Over a week, the steel wool turns into orange rust. How does the jar's mass now compare with its mass at the start?

A tray of wet sand was left open overnight. In the morning, the tray weighed less, but the sand was still there. What caused the change?

An open dish of clear salt water sat for several days. The water was gone, and white crystals were left in the dish. What are the crystals?

Two cups each held 200 grams of muddy water. One cup had a lid, and one was open. Three days later, which cup most likely weighed less?

A cup with water and gravel was left uncovered near a sunny window. It weighed less later, but the gravel amount looked the same. What left the cup?

A candle burned while it sat on a balance. The candle got shorter, and the reading went down. Where did most of the missing wax go?

Ty dropped a fizzing tablet into an open cup of water on a balance. As it bubbled, the reading went down. What explains the lower mass?

A bottle of sugar water had a loose lid. It read 160 grams, then 150 grams two days later. What most likely caused the lower reading?

A sealed jar of ice water sat on a balance on a warm day. Water drops formed on the outside of the jar, and the reading went up. Where did the extra mass come from?