How do I balance this science equation?
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Instructions on balancing chemical equations:
Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.
Example: Fe{3+} + I{-} = Fe{2+} + I2
Substitute immutable groups in chemical compounds to avoid ambiguity.
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,
but PhC2H5 + O2 = PhOH + CO2 + H2O will
Compound states [like (s) (aq) or (g)] are not required.
If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.
Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reagents
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Hydrazine, N2H4, and hydrogen, H2O2, have been used as rocket propellants. They react according to the equation: H2O2 + N2H4 → N2 + H2O a. How many moles of N2 are formed from 0.0250 moles of N2H4? (0.0250) b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced? (0.675) c. How many moles of H2O are formed if 1.87 moles of N2 is produced? (7.48)
What process causes dissolved substances to be left behind to form minerals after water in lakes or ponds evaporates?
125 cm3 of a solution contains 0.25 moles of the solute. What is the concentration of the solution?
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Here are two examples of strong nuclear force !
Protons and nucleons
I hope that's help !
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Plantations
Economies
Colonies
Cash Crops
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Answer: cash crops
Explanation:
trust
Answer: Cash Crops
Explanation: These crops were used in the south to make loads of money before the civil war in southern plantations so they were known as cash crops
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1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2
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A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
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Melting of wax is a physical change and chemical change is the burning of candle.
What is chemical and physical changes?
Chemical changes are those changes by which composition of the original matter changes and physical changes are those changes by which only appearance of the matter changes.
In the given activity:
- Melting of wax is a physical change because during this composition of wax not changes but only outer structure changes.
- Burning of candle and lighting the match are chemical change as it produces energy in the form of heat and light.
Hence, Roger is correct ie. The melting wax is a physical change and the burning candle wick is a chemical change.
To know more about physical and chemical changes, visit the below link:
brainly.com/question/17166994
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