Comparing Solutions - 3rd Grade Science

Which criterion checks whether a solution uses the least money or materials?

Cost (or resource use). This criterion helps choose the most economical option.
Which option best meets the criterion "safest" if A uses fire and B uses no heat?

Solution B. No heat is safer than using fire, which can cause burns.
Which criterion means a solution works the same way each time it is tried?

Reliability (consistent results). Reliable solutions give predictable, repeatable outcomes.
Which solution is more feasible at school: A needs a microscope, B needs a ruler and paper?

B. Rulers and paper are common school supplies, unlike microscopes.
Which criterion means a solution uses less energy, water, or other resources?

Efficiency (uses fewer resources). Efficient solutions accomplish more while using less.
What criterion describes how see-through a solution is?

Clarity (transparent, cloudy, or opaque). Transparent means completely see-through, while opaque blocks all light.
Which criterion checks whether a solution works well for the goal, not just a little?

Effectiveness. Effective solutions achieve the desired result successfully.
Which solution is more reliable: A works $5$ of $5$ trials, B works $2$ of $5$ trials?

A. Working $5$ out of $5$ times shows better consistency than $2$ out of $5$ .
Identify the best criterion to compare two solutions if the goal is to see which has fewer visible particles.

Clarity (cloudiness) or presence of particles. Both criteria assess solution transparency and particle content.
Identify the best conclusion when two solutions tie on all criteria you listed.

Both are equally good; choose either or add a new criterion. When solutions tie, you need more criteria to break the tie.
Which option is best if criteria are cost then time: A costs $4$ and takes $5$ min; B costs $4$ and takes $9$ min?

A. Same cost means time becomes the deciding factor; $5$ min beats $9$ min.
What is a criterion when you compare two different solutions to the same problem?

A rule or standard used to judge solutions. Criteria help decide which solution works best for your needs.
Which option is best if the ONLY criterion is shortest time: A takes $8$ min or B takes $12$ min?

A. $8$ minutes is shorter than $12$ minutes.
Which criterion means a solution costs less money or uses fewer materials?

Cost (least expensive). Lower cost means saving money and materials for other uses.
Identify the best choice using the criterion "strongest": A holds $4$ books, B holds $6$ books.

Solution B. $6 > 4$ books, so B can support more weight.
Which criterion means a solution creates less waste or pollution?

Environmental impact (less pollution or waste). Solutions with low environmental impact protect nature.
Which solution is more accurate if A says water boils at $100$ °C and B says water boils at $50$ °C?

Solution A. Water actually boils at $100$ °C, not $50$ °C.
Which criterion means a solution uses less time or works faster?

Time (speed). Faster solutions save time for other important tasks.
Which solution has the faster dissolving rate if A dissolves in $30$ s and B dissolves in $60$ s?

Solution A. A dissolves in half the time, making it twice as fast as B.
Which option is best if the ONLY criterion is lowest cost: A costs $5$ or B costs $3$ ?

B. $3$ is less than $5$ , so B costs less money.
Which criterion means a solution is safe for people, animals, and the environment?

Safety. Safe solutions protect living things and their surroundings from harm.
What criterion describes the way a solution looks, such as red, brown, or clear?

Color. Visual appearance helps identify and distinguish between different solutions.
What criterion describes whether a solution stays mixed over time without separating?

Stability (does not separate over time). True solutions remain uniformly mixed without settling or separating.
Which solution has more sediment if A has a layer at the bottom and B has none?

Solution A. Sediment forms when particles don't fully dissolve or settle out.
Identify the best overall solution if criteria are safety first, then cost: A is unsafe and cheap; B is safe and costs more.

Solution B. Safety is the top priority, making B the better choice despite higher cost.
Which option is best if the ONLY criterion is safety: A uses boiling water, B uses room-temperature water?

B. Room-temperature water is safer than boiling water.
Which criterion checks whether a solution can be followed step by step without confusion?

Clarity. Clear solutions have organized steps that are easy to understand.
Which criterion checks whether a solution is likely to last a long time without breaking?

Durability. Durable solutions stay strong and useful over time.
Which solution is more feasible if you have only $1$ meter of tape, and A needs $2$ meters while B needs $1$ meter?

Solution B. B matches your available tape amount; A needs more than you have.
What criterion describes how strong or noticeable a smell is in a solution?

Odor strength. Smell intensity varies with the type and amount of dissolved substances.
Which criterion means a solution matches the question and uses correct science ideas?

Accuracy (correctness). Accurate solutions use true facts and correct scientific principles.
Which criterion checks whether a solution can be done with the materials, time, and tools available?

Feasibility. Feasible solutions can actually be completed with what you have.
Identify the best choice using the criterion "lowest cost": A costs $3$ dollars, B costs $5$ dollars.

Solution A. $3 < 5$ , so A costs less money than B.
Which option best meets the criterion "least waste" if A throws away $5$ items and B throws away $2$ items?

Solution B. $2 < 5$ items, so B creates less trash.
Identify the best choice using the criterion "uses less water": A uses $2$ cups, B uses $3$ cups.

Solution A. $2 < 3$ cups, so A conserves more water.
Which criterion checks whether a solution is fair and uses the same rules for all options?

Fairness. Fair solutions treat everyone equally without bias or special treatment.
What criterion describes how quickly a solute mixes evenly into a solvent?

Dissolving rate (how fast it dissolves). Faster dissolving means the solute spreads through the solvent more quickly.
Which option is the best conclusion when A is darker color and B is lighter, using only the color criterion?

Solution A has a darker color than Solution B. Color comparison only describes visual appearance, not other properties.
Which option is best if criteria are safety then cost: A is safer but costs $6$ ; B is less safe and costs $2$ ?

A. When safety comes first, choose the safer option even if it costs more.
Which option is best if the ONLY criterion is least waste: A throws away $2$ cups of water, B throws away $5$ cups?

A. Wasting $2$ cups creates less waste than wasting $5$ cups.
Which criterion checks whether a solution is based on correct facts and science ideas?

Accuracy. Accurate solutions use true information and proven science concepts.
Choose the better solution using the criterion "clear steps": A has numbered steps, B has missing steps.

Solution A. Numbered steps are easier to follow than incomplete instructions.
Which criterion checks whether a solution keeps people and animals from harm?

Safety. Safe solutions prevent injuries and protect living things.
Which solution is clearer if A is cloudy and B is transparent?

Solution B. Transparent solutions allow light to pass through without scattering.
What is a criterion when you compare two solutions to a problem?

A rule or standard used to judge which solution is better. Criteria help us decide which solution works best for our needs.
What criterion describes whether a solution has visible pieces that settle out?

Presence of particles or sediment. Undissolved particles indicate incomplete mixing or oversaturation.
Which solution is better for environmental impact: A uses a reusable bottle; B uses a new plastic bottle each day?

A. Reusing creates less plastic waste than throwing away daily bottles.
Which solution is more stable if A separates into layers after $10$ minutes and B stays mixed?

Solution B. Stable solutions maintain uniform distribution without separating.
Identify the best choice using the criterion "fastest": A takes $10$ minutes, B takes $7$ minutes.

Solution B. $7 < 10$ minutes, so B completes the task quicker.
Which criterion checks whether a solution answers the question asked?

Relevance to the problem. A relevant solution directly addresses the problem being solved.
Which criterion means a solution is easy to do with available tools and materials?

Feasibility (practicality). Practical solutions can be done with what you have available.
Identify the better solution using accuracy: A claims plants grow without water; B claims plants need water.

B. Plants do need water to survive, making B scientifically accurate.
What is a criterion you can use to compare two solutions (mixtures) in science?

A rule for comparison, such as color, clarity, or how fast it dissolves. Criteria are standards used to evaluate and compare different solutions.

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