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Snezhnost [94]
4 years ago
11

The reaction where heat is added is called? removed?

Chemistry
1 answer:
Harrizon [31]4 years ago
4 0
Endothermic<span> Reaction??? </span>
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They are the same as one parent :)

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The oceanic crust is mostly associated with the —————.
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Substance in mixtures do not change chemically. True or false
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The number of neutrons in an atom can be found by subtracting the atomic number from the what?
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This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu. Isotopes of the same element will have the same atomic number but different mass numbers.

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1. Marisa determined the melting point of a substance to be 24.5C. Find the percent error of her measurement if the actual melti
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Answer:

\%\ Error = 21.5\%

Explanation:

Given

Measured = 24.5

Actual = 31.2

Required

Determine the percentage error

First, we need to determine the difference in the measurement

Difference = |Actual - Measured|

Difference = |31.2 - 24.5|

Difference = |6.7|

Difference = 6.7

The percentage error is calculated as thus:

\%\ Error = \frac{Difference * 100\%}{Actual}

\%\ Error = \frac{6.7 * 100\%}{31.2}

\%\ Error = \frac{670\%}{31.2}

\%\ Error = 21.4743589744\%

\%\ Error = 21.5\% <em>approximated</em>

6 0
4 years ago
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