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3 years ago

When the temperature of a substance _, the motion of the atoms that make up that substance _.

Chemistry

1 answer:

Mkey [24]3 years ago

7 0

Increase in temperature makes the atoms speed up, and decrease in temperature makes the atoms move slower.

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You were rushing to get to school on time and dropped your breakfast food! Choose one atom in that food item and explain the sto

OLga [1]

Answer:

I am going to chose your apple on your breakfast plate. Somebody plantes the apple seed. The apple tree takes time to grow. Once the apples are ready to be picked they are picked. Then the apples are sorted and go off to different schools like your school. Which is where you pick the apple up and put it on your plate.

Explanation:

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3 years ago

How many valence electrons does iron have?

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Iron has TWO valence electrons......

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3 years ago

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How many moles of h2o will be produced from 42.0 grams of h2o2

lisabon 2012 [21]

The answer is 44.6 mol

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3 years ago

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How many moles of sodium phosphate would be required to react with 1.0 mol of silver nitrate

WITCHER [35]

1) State the balanced chemical equation

Na3 PO4 + 3 AgNO3 → 3NaNO3 + Ag3 PO4

sodium phosphate silver nitrate sodium nitrate silver phosphate

2) State the molar ratios

1 mol Na3PO4 : 3 mol AgNO3 : 3 mol NaNO3 : 1 mol Ag3 PO4

3) As you see 3 moles of Silver Nitrate react with 1 mol of Na3 PO4, then you will need.

The you need to use the molar ratio 1:3 to calculate the number of moles of sodium phosphate

1 mol Ag NO3 * [ 1 mol Na3 PO4 / 3 mol Ag NO3] = 0.33 mol Na3 PO4

Answer: 0.33 mol sodium phosphate

3 0

3 years ago

The standard enthalpy change for the following reaction is 232 kJ at 298 K. 2 H2CO(g) 2 C(s,graphite) + 2 H2(g) + O2(g) ΔH° = 23

Georgia [21]

Answer: The standard enthalpy change for this reaction is -116 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction is,

$2H_2CO(g)\rightarrow 2C(s, graphite)+2H_2(g)+O_2(g)$

$\Delta H^0=232KJ$

Now we have to determine the value of $\Delta H$ for the following reaction i.e,

$)C(s, graphite)+H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2CO(g)$ $\Delta H^0'=?$

According to the Hess’s law, if we reverse the reaction then the $\Delta H$ will change its sign and if we half the reaction, then the

So, the value $\Delta H^0'$ for the reaction will be:

$\Delta H^0'=\frac{(-232kJ/mole)}{2}=-116kJ$

Hence, the standard enthalpy change for this reaction is -116 kJ

7 0

3 years ago

When the temperature of a substance _____, the motion of the atoms that make up that substance _____.

When the temperature of a substance _, the motion of the atoms that make up that substance _.