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3 years ago

Heat is the measurement of energy from all the particles that are in a substance. true or false?

Chemistry

2 answers:

igomit [66]3 years ago

6 0

Pretty sure that's false

wariber [46]3 years ago

3 0

I am preety sure it is false

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Distinguish between single and double replacement reactions and give an example of<br> each.

statuscvo [17]

Answer:

Anabolism builds complex molecules from simpler ones, while catabolism breaks large molecules into smaller ones.

Explanation:

5 0

3 years ago

A graduated cylinder is filled with 50.7 mL of water. If a 10.0 g piece of zinc metal is added to the water, and the volume rise

Triss [41]

Answer:

<h3>The answer is 7.14 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 10 g

volume = final volume of water - initial volume of water

volume = 52.1 - 50.7 = 1.4 mL

We have

$density = \frac{10}{1.4} \\ = 7.142857...$

We have the final answer as

Hope this helps you

5 0

3 years ago

Which scenario BEST describes how an atom produces light?

oksian1 [2.3K]

Answer:

electron loses energy as it transitions to lower energy level

Explanation:

An atom is capable of absorbing and releasing electrons. The atom of a substance is said to be at its GROUND LEVEL STATE when it contains the lowest energy level. However, when it absorbs or takes in energy, it moves to a high energy level called EXCITED STATE. This level is unstable and hence, subject to declination.

Due to the instability of the excited state of an atom, it tends to lose the absorbed electrons and in the process of doing so, it emits or produce light. Therefore, according to this question, light is produced by an atom when the electron loses energy as it transitions to lower energy level i.e excited state to ground level state.

7 0

3 years ago

a 14.24 gram rock is dropped into a graduated cylinder containing 5.7 mL of water the final volume reading on The Graduate after

Verizon [17]

The volume of water in the graduated cylinder is 5.7 mL, volume increases to the value 17.3 mL when a 14.24 g of rock is dropped into it.

The increase in volume is due to the added volume of rock. Thus, volume of rock can be calculated by subtracting initial volume from the final volume as follows:

$V_{rock}=V_{final}-V_{initial}$

On putting the values,

$V_{rock}=17.3 mL-5.7 mL=11.6 mL$

For correct significant figures, volume should be in 2 significant figures.

Therefore, volume of rock will be 12 mL.

8 0

3 years ago

For the following reaction if you have 13.2g of CO and 42.7g of Fe2O3, which is the limiting reagent with regards to the Fe prod

MrRissso [65]

Answer: CO is a limiting reagent with regards to the Fe production.

Explanation:

$Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)$

Moles of CO = $\frac{\text{mass of CO}}{\text{molar mass of CO}}=\frac{13.2 g}{28 g/mol}=0.4714 mol$

moles of $Fe_2O_3=\frac{\text{mass of} Fe_2O_3}{\text{molar mass of}Fe_2O_3}=\frac{42.7 g g}{159.7 g/mol}=0.2673 mol$

According to reaction , 3 mole of CO reacts with 1 mole of $Fe_2O_3$ then , 0.4714 moles of CO will react with : $\frac{1}{3}\times 0.4714$ moles of $Fe_2O_3$ that is 0.1571 moles.

0.4714 moles of CO will react with 0.1571 moles of $Fe_2O_3$ which means that CO is present in limited amount acting as limiting reagent.

Mole remaining of $Fe_2O_3$ = 0.2673 mol - 0.1571 mol = 0.1102 mol

Hence, CO is a limiting reagent and $Fe_2O_3$ is an excessive reagent.

8 0

3 years ago