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Chemistry

How many years have the earth

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Chemistry

What is the lowest atomic number a new element can have

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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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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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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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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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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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Chemistry

Based on the measured pH values, identify the liquid tested that is 10 times more acidic than vinegar.

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Chemistry

In protein synthesis, how many nitrogenous bases code for a single amino acid?

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Chemistry

You may normally expect a slow reaction rate if a large A. E. is required

True or False?

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Chemistry

Give the quantum values of n, l, m and s for nitrogen

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Chemistry

Argon, krypton, and xenon are

a. noble gases.

b. lanthanides.

c. alkaline earth metals.

d. actinides.

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Chemistry

What can be observed about a substance that does not change the identity of that substance

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