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Chemistry

Consider the following thermochemical equation: C (s) + O2 (g) → CO2 (g) ΔH = - 393 kJ CO (g) + ½O2 (g) → CO2 (g) ΔH = - 294 kJ What is the enthalpy change for the following related thermochemical equation C (s) + ½O2 (g) → CO (g) Group of answer choices a. - 687 kJ b. - 99 kJ c. + 99 kJ d. + 687 kJ

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Gabrielle Weber

Chemistry

Two colorless solutions are mixed together. Bubbles form as the solution is stirred. Give TWO possible explanations for this result.

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Chemistry

What is a light-year?

A.

the distance light travels in one earth year

B.

the distance light travels from the sun to the earth

C.

the distance light travels in one orbit of the moon

D.

the time it takes light to travel across the universe

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Chemistry

What's is a logical way that you could begin to investigate why your tire had low air pressure?

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Chemistry

after balancing the redox equation FeCl3+Zn--->ZnCl2+Fe, what are the coefficients, in order from left to right?

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Mohammed Kramer

Chemistry

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

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Chemistry

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

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Chemistry

Which microscope came out first

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Chemistry

Which exerts greater pressure on the floor-standing flat-footed or standing on tiptoe?

on tiptoe, because the force acts over less area

on tiptoe, because the force acts over more area

flat-footed, because the force acts over more area

flat-footed, because the force acts over less area

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Chemistry

1. Sara tells Michael she is 160 centimeters tall, while Michael says he is 60 inches tall. If there are 2.54 centimeters in an inch, who is taller

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Chemistry

How do you tell if a compound is polar or non polar

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Chemistry

What two ions are central to the arrhenius definitions of acids and bases?

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Chemistry

Question 1

A process in which suthetances chemically rearrange to form new substances

o

Molecule

Energy

o

Organism

O

Chemical reaction

O

Matter

O

Cellular respiration

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Chemistry

What are the uses of evaporative salts?

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Chemistry

Which of the following are elements? O2 Ca KF B

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