3 years ago

How do you know if a reaction is exothermic

Chemistry

2 answers:

melisa1 [442]3 years ago

7 0

When there is heat released

UNO [17]3 years ago

6 0

When heat is released

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Abigail obtained 18.9 grams of calcium carbonate after performing a reaction. From her calculations, she knew she should have ob

zysi [14]

Answer:Percent error= 90.9%

Explanation:

Percent error or percentage error is defined as the percentage of the difference between a measured value usually from an experiment and an exact value in comparison to the exact number.

its formula is thus

Percent error = experimental value - exact or actual value /exact value x 100

=(18.9 - 9.9 /9.9 ) x 100= 9/9.9) x 100

0.909 x 100 = 90.90 = 90.9%

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4 years ago

A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correc

sineoko [7]

Answer:

Last option is the correct choice.

Explanation:

Number of protons = 60-33 = 27

Superscript 60 Subscript 27 upper C o.

Best Regards!

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3 years ago

Nevermind for this one!

Simora [160]

Answer:

ty :D

Explanation:

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3 years ago

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zalisa [80]

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the water evaporated so there is less water

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3 years ago

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Will someone actually help me and not just something random

Novosadov [1.4K]

Answer:

Explanation:

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4 years ago