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Mimi
Chemistry
How many years have the earth
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Kendra
Chemistry
What is the lowest atomic number a new element can have
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Laci Holmes
Chemistry
H2O2, hydrogen peroxide, naturally breaks down into H2O and O2 over time. MnO2, manganese dioxide, can be used to lower the energy of activation needed for this reaction to take place and, thus, increase the rate of reaction. What type of substance is MnO2?
a. a reactant
b. an inhibitor
c. an enhancer
d. a catalyst
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Ariel Ferguson
Chemistry
Which equation is an example of the synthesis reaction
CaO+CO2---> CaCO3
2NaCL - -> 2Na+Cl2
HCI+N aOH - --> NaCL+H2O
Mgl2+Cl2 - -> MgCL2+l2
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Charlee Thornton
Chemistry
A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out
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Jacquelyn
Chemistry
Molecules move slowest when carbon dioxide is in which form?
A. liquid carbon dioxide
B. solid carbon dioxide
C. carbon dioxide gas
D. plasma carbon dioxide
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Dustin Cole
Chemistry
What is the best explanation of why the iron found in the inner core of the Earth remains in the solid state even though the temperature in the inner core is roughly 5700 °C?
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Alessandro Ramirez
Chemistry
If two poisonous elements are combined chemically, which of the following will be true of the resulting compound? The compound will be as poisonous as the elements, based on the chemical properties of the two elements.
The compound will be more poisonous than the elements, based on the chemical properties of the two elements.
The compound will not be poisonous, based on the chemical properties of the new substance.
The compound may or may not be poisonous, depending on the chemical properties of the new substance.
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Makai Stewart
Chemistry
Liquid 1 reacts with liquid 2, producing a solid and a gas. using this scenario, which supports the law of conservation of mass?
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Waters
Chemistry
Based on the measured pH values, identify the liquid tested that is 10 times more acidic than vinegar.
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Jamison Lyons
Chemistry
In protein synthesis, how many nitrogenous bases code for a single amino acid?
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Darnell Crane
Chemistry
You may normally expect a slow reaction rate if a large A. E. is required
True or False?
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Jaidyn Shannon
Chemistry
Give the quantum values of n, l, m and s for nitrogen
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Guest
Chemistry
Argon, krypton, and xenon are
a. noble gases.
b. lanthanides.
c. alkaline earth metals.
d. actinides.
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Isiah
Chemistry
What can be observed about a substance that does not change the identity of that substance
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