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spin [16.1K]
3 years ago
8

PLZ HELP Question 14 of 25 What is the name for a representation of the physical world?

Chemistry
1 answer:
JulijaS [17]3 years ago
8 0

Answer:

Model

Explanation:

A model of anything is something you make to represent it in it's physical world form

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A chemical reaction that ______ energy can be used to heat up other substances.
Luba_88 [7]

Answer: Release

Explanation:

4 0
3 years ago
How does thermal energy flow?
mart [117]
My answer is....A

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6 0
3 years ago
You heat 3.869 g of a mixture of fe3o4 and feo to form 4.141 g fe2o3. What is the mass of oxygen reacted?
Lostsunrise [7]

The reaction is  

FeO + Fe3O4 + 1/2 O2---> 2Fe2O3

Thus as shown in the balanced equation two moles of Fe2O3 are formed when 0.5 moles of O2 reacted with mixture of FeO and Fe3O4

moles of Fe2O3 = MAss / Molar mass = 4.141 / 159.69 = 0.0259 moles

So moles of O2 needed = 0.5 X 0.0259 = 0.01295

Mass of O2 = moles X molar mass = 0.01295 X 32 = 0.4144 grams

5 0
3 years ago
How many sig figs are there<br> 5.00000008
djverab [1.8K]

Answer:

2 sig figs.

Explanation:

Sig Fig Rules:

Any non-zero digit is a significant figure.

Any zeros between 2 non-zero digits are significant figures.

Trailing zeros after the decimal are significant figures.

6 0
3 years ago
if 980 KJ of energy are added to 6.2 L of water at 291 K, what will the final temperature of the water be
uranmaximum [27]

Answer:

The final temperature of the water will  be 328.81 K .

Explanation:

Using the equation, <em>q = mcΔT</em>

here, <em>q = energy</em>

<em>m= mass</em>

<em>c= specific heat capacity </em>

<em>ΔT= change in temperature</em>

<em>Mass of water = 1kg (1000 g ) per liter</em>

<em>∴ 6.2 Liter of water = 6200 g</em>

<em>c of water ≈ 4.18 J /g/K</em>

<em>Now, </em>

<em>980000 = 6200*4.18*ΔT</em>

<em>ΔT = 37.81 K</em>

<em>∴ final temperature of the water = 291 + 37.81 = 328.81 K</em>

6 0
3 years ago
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