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ChemistryChemistry
Frances Cummings
A sentence in potential energy
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ChemistryChemistry
Jordon Allison
Which of these substances is a pure substance?

1. hydrogen gas

2. the liquid called tea

3. Coca cola
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ChemistryChemistry
Judith Cabrera
Activation energy is defined as
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ChemistryChemistry
Byron Washington
Benzene and its derivatives undergo a type of substitution reaction in which a hydrogen atom is replaced by a substituent, but the stable aromatic benzene ring is regenerated at the end of the mechanism.
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ChemistryChemistry
Silly Gilly
Graph the lines y = 3x, y = 3x - 3, and

y = 3x + 3. What do you notice about the lines? Make a conjecture based on your observation.

It says chemistry but it's really math.
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ChemistryChemistry
Ellie
Which of the following causes slow environmental changes?

(a) tsunami

(b) landslides

(c) weathering and erosion

(d) forest fire
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ChemistryChemistry
Mareli Sanchez
Which has a higher frequency electron or a neutron
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ChemistryChemistry
Sean Glass
What is freshly prepared feso4 used in ghe brown ring test
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ChemistryChemistry
Heidy Marshall
What is the molecular structure of water?
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ChemistryChemistry
Koen Erickson
Which of the following is a physical change?

A. magnetzing an iron rod

B. roasting marshmallows on a campfire

c. milk souring

D. an antacid neutralizing stomach acid
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ChemistryChemistry
Jaqueline Rivera
Which of the following objects would require the use of a large-scale model?

An atom

A car engine

A frog's heart

The Mississippi River
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ChemistryChemistry
Cloe Cantrell
What is the empirical formula for C5H1102? *

A. C10H2202

B. C5H110

C. C5H1102

D. C2H110
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ChemistryChemistry
Elizabeth Wise
How is the energy level of an atom's valence electrons related to the period in the periodic table?
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ChemistryChemistry
Elsa Glover
In the presence of a platinum catalyst, ammonia, NH3, burns in oxygen, O2, to give nitric oxide, NO, and water vapor. How many volumes of nitric oxide are obtained from one volume of ammonia, assuming each gas is at the same temperature and pressure?
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Guest
How can you distinguish

between living organisms

and nonliving materials

in a water sample?
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