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olga nikolaevna [1]
3 years ago
9

Write a conclusion using the CER method. Your conclusion must include the following: - Claim: State your claim. Your claim is th

e answer to the original question: “What is the difference between a physical and a chemical change?” - Evidence & Reasoning: Provide evidence and reasoning to back up your claim. To do this, you need to discuss at least one example of a physical change and one example of a chemical change from the card sort. Using specific evidence and the definition of a physical/chemical change, describe how you knew what type of change had occurred.
Chemistry
1 answer:
Karolina [17]3 years ago
4 0
Nobody on here is going to write a entire cer for you
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Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas
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Answer: Number of molecules of hydrogen gas 6.32\times 10^{32}

Explanation:

2Na+2H_2O\rightarrow 2NaOH+H_2

Number of moles of sodium =\frac{\text{mass of sodium}}{\text{molar mass of sodium}}=\frac{48.7 g}{23 g/mol}=2.11mol

According to reaction , 2 moles of sodium produces 1 mole of hydrogen gas , then 2.11 mol of sodium will= \frac{1}{2}\times 2.11 mol of hydrogen gas that is 1.05 moles of hydrogen gas.

Number of molecules = N_A(\text{Avogadro number})\times moles of substance

Moles of hydrogen gas formed = 1.05 moles

Number of molecules of hydrogen gas = N_A\times moles of hydrogen gas

Number of molecules of hydrogen gas =6.022\times 10^{23} mole^{-1}\times 1.05 mole=6.32\times 10^{32}

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3 years ago
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Answer:

I' really don't know I'm sorry

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The photograph shows one of the boats in a science club's toy boat race. All the boats were powered by identical
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Answer:

Boat p

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TRUE OR FALSE 3D printing waste less material than traditional manufacturing.
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How many moles of helium are needed to fill a balloon to a volume of 6.3 L at 28 °C and 320
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.11 mol

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