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Which of these is the empirical formula for N2O4?

Which of these is the empirical formula for N2O4?

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A negatively charged atom or group of atoms is called __  __…

A negatively charged atom or group of atoms is called __  ___________; a positively charged atom or group of atoms is called __ ___________.  

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Which of these is the symbol for tin?

Which of these is the symbol for tin?

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Which symbol below stands for potassium?

Which symbol below stands for potassium?

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Add  these measured values and give the correct sum: 3.201 +…

Add  these measured values and give the correct sum: 3.201 + 0.0325  + 10.0400 = ?

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What is the best description of this group?          Cu, H2O…

What is the best description of this group?          Cu, H2O, NaCl, I2  

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What is the mass of 0.432 moles of C8H9O4? Consider one mole…

What is the mass of 0.432 moles of C8H9O4? Consider one mole and go from there.

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What is the percentage of composition of HClO3? HINT: Consid…

What is the percentage of composition of HClO3? HINT: Consider one mole in grams.

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Add  these measured values and give the correct sum: 3.201 +…

Add  these measured values and give the correct sum: 3.201 + 0.0325  + 10.0400 = ?

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How many moles of solute are there in 754 mL of a 0.250 M Na…

How many moles of solute are there in 754 mL of a 0.250 M NaCl solution? Hint: Rearrange the equation for the definition of molarity. Cancel units.

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