Grade 10 · Science · Chemistry

10th grade Why salt, sugar and copper behave differently worksheet

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Why salt, sugar and copper behave differently

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Table salt's density is 2.17 g/cm³ (CRC). What is the mass of a 3 cm³ salt crystal, Ari?
Copper's density is 8.933 g/cm³ (PubChem). What is the mass of a 1.5 cm³ copper block, to 0.01 g, Esme?
3.
Why does salt need a much higher temperature to melt than sugar, Jun?
- Sugar is a metal
- Ionic attractions are strong
- Salt crystals are larger than sugar's
4.
When sugar melts, what is pulled apart, Kira?
- Whole sugar molecules
- Sodium and chloride ions
- The atoms inside each molecule
5.
Why does salt water conduct electricity, Milo?
- Its dissolved ions can move
- Any solution conducts
- Water molecules carry current
6.
Does sugar water conduct electricity, Noah?
- Yes: it is a solution
- No: its molecules aren't ions
- Yes: sugar breaks into ions
7.
Salt is melted at 800.7 °C. Does the liquid conduct, Pia?
- No: liquids can't conduct
- Yes: its ions are free
- No: it is still salt
8.
A solid melts above 700 °C, shatters and conducts only when dissolved. What bonding does it likely have, Ren?
- Ionic
- Metallic
- Covalent molecules
9.
A solid is shiny, bends and conducts as a solid. What bonding does it likely have, Tala?
- Metallic
- Ionic
- Covalent molecules
10.
A solid melts below 200 °C and doesn't conduct even when dissolved. What bonding does it likely have, Zee?
- Metallic
- Covalent molecules
- Ionic

Why salt, sugar and copper behave differently. Every version has 10 questions, and the answer key prints on the second page.

I can explain why salt, sugar and copper melt, conduct and break differently, from the forces between their particles.
I can say that ionic solids conduct only when melted or dissolved, and that sugar water doesn't conduct.
I can identify a solid's bonding from its properties.
I can compute masses from densities and compare melting points in kelvins.

Standard: HS-PS1-3

brittle: Breaks or shatters instead of bending

conduct: Let electric charge flow

ductile: Able to be drawn into wire

molecular solid: A solid of separate covalent molecules, like sugar

ionic solid: A solid lattice of ions, like salt

Your child added the melting points. How much higher one is than another is a difference: subtract.

Your child divided. Mass = density × volume.

Your child divided Celsius readings. Ratios of temperatures need kelvins: add 273.15 to each first.

What is the most common mistake with why salt, sugar and copper behave differently?

Your child added the melting points. How much higher one is than another is a difference: subtract.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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