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3 years ago

12

Melting and boiling point of water is high?

2 answers:

yan [13]3 years ago

7 0

Answer:

the temperature in the hydrogen bonding between water molecules that causes them to stick together which happens when ice melts and water boil to become a gas

MariettaO [177]3 years ago

3 0

Answer:

Yes

Explanation:

Why melting and boiling point of water is high?

The reason for the high melting and boiling temperatures is the hydrogen bonding between water molecules that causes them to stick together and to resist being pulled apart which is what happens when ice melts and water boils to become a gas

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Which of the following describes a strong acid?

zlopas [31]

I remember learning this last y’all i jus don’t remember it might be A or C

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3 years ago

A scientist measures the standard enthalpy change for the following reaction to be -17.2 kJ : Ca(OH)2(aq) 2 HCl(aq)CaCl2(s)

elixir [45]

Answer: $\Delta H^{0}=-173.72$ kJ/mol

Explanation: <u>Enthalpy</u> <u>Change</u> is the amount of energy in a reaction - absorption or release - at a constant pressure. So, <u>Standard</u> <u>Enthalpy</u> <u>of</u> <u>Formation</u> is how much energy is necessary to form a substance.

The standard enthalpy of formation of HCl is calculated as:

$\Delta ^{0}=\Sigma H_{products}-\Sigma H_{reactants}$

$Ca(OH)_{2}_{(aq)}+2HCl_{(aq)}$ → $CaCl_{2}_{(s)}+2H_{2}O_{(l)}$

Standard Enthalpy of formation for the other compounds are:

Calcium Hydroxide: $\Delta H^{0}=$ -1002.82 kJ/mol

Calcium chloride: $\Delta H^{0}=$ -795.8 kJ/mol

Water: $\Delta H^{0}=$ -285.83 kJ/mol

Enthalpy is given per mol, which means we have to multiply by the mols in the balanced equation.

Calculating:

$-17.2=[-795.8+2(285.85)]-[-1002.82+2\Delta H]$

$-17.2=-1367.46+1002.82-2\Delta H$

$2\Delta H=17.2-364.64$

$\Delta H=-173.72$

So, the standard enthalpy of formation of HCl is -173.72 kJ/mol

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3 years ago

FOR LondonCreamCakes<br> no sure if its right but im trying to help.. lol dont mind all the tabs

MAVERICK [17]

Answer:

It kinda helps but not really

Thanks for trying anyway doe!

Explanation:

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3 years ago

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ollegr [7]

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3 years ago

A good hypothesis must be which of the following?

yanalaym [24]

Testable, that is always required for a hypothesis. Otherwise, how can you prove it?

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3 years ago

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