science

Which change is chemical?

water boiling

water undergoing electrolysis***

water freezing

water evaporating

Which number remains unchanged during photosynthesis?

the number of carbon atoms***

the number of water molecules

the number of glucose molecules

the number of carbon dioxide molecules

In a chemical reaction, which aspect of the reactants changes?

mass***

total mass

atoms

nuclei

A young snake eats and digests a mouse. The increase in the snake’s mass equals

the mass of the mouse plus the mass of waste produced by the snake.

the mass of the mouse plus the original mass of the snake.

the mass of the mouse.

the mass of the mouse minus the mass of waste produced by the snake.***

Cellular respiration transforms glucose and oxygen into carbon dioxide, water, and energy.



C6H12O6 + 6O2 → 6CO2 + ?H2O + Energy



Based on the law of conservation of matter, what is the missing coefficient for water?

4

6***

2

8

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  1. All correct, 100% :)

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  2. All were right, thank you!

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  3. water undergoing electrolysis
    the number of carbon atoms
    mass
    the mass of the mouse minus the mass of waste produced by the snake
    6

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  4. Sno~ is right. For Incc at least.

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  5. All correct in 2021

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  6. Nvm all right except number 4

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  7. Yeah the other one is arrangement of the atoms. its question 3 for me

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  8. Trust me!! Is right for number 3

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  9. In a chemical reaction the total mass remains unchanged the arrangement of atoms change

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  10. Trust me!! Is correct for number 3

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