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Chemistry
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In one experiment, the temperature of 50 g of water increased from 22.0 °C to 38.4 °C. The mass of alcohol burned was 0.8 g. Calculate the heat energy (Q) in joules, released by burning 0.8 g of the alcohol.

Key Equation: Q = mcΔT Where: Q = heat transferred (J), m = mass of substance which is heated (g), c = heat capacity of water (J g-...

Answered by David B. Chemistry tutor
10822 Views

balance equation : PCl5 + 4H2O → H3PO4 + HCl

fist look at the first molecule on the left of the equation, the first atom is P there's 1 mole and looking at the right there is also only one. the look at the next atom Cl which has five mole, on the ri...

Answered by Christine M. Chemistry tutor
12591 Views

Calculating the charge of a molecule e.g In NH4 what is the charge of the nitrogen atom?

For the atom which you want to calculate the charge determine the number of valence electrons a free atom usually has. this is the number of atom on the outer shell so for nitrogen, it has 5 valence atoms...

Answered by Christine M. Chemistry tutor
7714 Views

What is an ionic compound and how do they form?

When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions.  The resulting compound is called an ionic compound.

A few examples of ionic ...

Answered by Janine A. Chemistry tutor
6804 Views

Why does bromine water become colourless upon the addition of ethene, but not ethane? What is this reaction called?

Bromine water reacts with ethane as it is able to break open the double bond, forming 1,2-dibromoethane. This double bond is not present in ethane, so bromine water does not react with it. This reaction i...

Answered by Omar A. Chemistry tutor
20557 Views

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