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pogonyaev
3 years ago
14

Not sure if my answers are even correct. i am so confused

Chemistry
1 answer:
Mamont248 [21]3 years ago
7 0

Answer:

#3 is the percentage for sodium i believe and 4 is right

Explanation:

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Which SI unit would be most appropriate for expressing the mass of this animal
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Answer:

Kilograms, I think.

Explanation:

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A certain atom has an atomic number of four. how many protons does it have? 8 2 0 4 description
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4 protons the number of proton has the same number of electron [which is the same as atomic number]
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This means that the steel bar lost 14900 J of thermal energy. What is the change in temperature of the steel bar? Recall that th
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Answer:

ΔT=-747,13°C

Explanation:

Sensible heat is<em> the amount of thermal energy that is required to change the temperature of an object</em>, the equation for calculating the heat change is  given by:

Q=msΔT

where:

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  • m, mass of the substance [g]
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To solve the problem, we clear ΔT of the equation and then replace our data:

Q=msΔT

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ΔT=\frac{-14900 J}{40,7g*0,49\frac{J}{gC} }=-747,13°C

<em>(Note that Q=-14900 J because there is a </em><u><em>LOST</em></u><em> of thermal energy)</em>

Thus, the change in temperature of the steel bar is -747,13°C, meaning that the temperature of the bar decreases.

5 0
3 years ago
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Describe the importance of Antoine Lavoisier's work with combustion. Include in the answer the title he was given and what he di
Komok [63]

Answer:

Explanation:

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8 0
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Match the part of the wave to the diagram
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Answer:

The first high part is Q4, then the low part is Q7, the following high part is Q6, and the energy moving from the next two high points is Q5.

Explanation:

The first high part is Q4, then the low part is Q7, the following high part is Q6, and the energy moving from the next two high points is Q5 because of the diagram.

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2 years ago
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