Chemistry » Page 59

Chemistry

Amina

You should be worried about the safety of a healthcare product if you see which of the following claims made?

a. FDA approved!

b. Miracle cure!

c. Scientifically tested!

d. Effective in double-blind study!

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Chemistry

Ashten

Which branch of science provide the proof that earth is approximately 4.6 billion years old

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Chemistry

Jarrett

What is the product if an atom of Po-209

undergoes alpha decay?

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Chemistry

Cierra Peck

The first-order decomposition of n2o at 1000 k has a rate constant of 0.76 s-1. if the initial concentration of n2o is 10.9 m, what is the concentration of n2o after 9.6 s

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Chemistry

Marques Welch

When a catalyst lowers the activation energy of a reaction the rate of the reaction?

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Chemistry

Brice Howard

Liquids: A) must be contained to stay in one spot B) have a variable volume, but a fixed mass C) are usually more dense than solids and gases D) cannot be changed into gases

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Chemistry

Cindy James

Given the following list from the activity series of metals (from most active to least active) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur?

1. Co²⁺ (aq) + Al (s) → Al³⁺ (aq) + Co (s) 2. Cd (s) + Pb²⁺ (aq) → Pb (s) + Cd²⁺ (aq) 3. All of the listed reactions will occur. 4. Na (s) + Mn²⁺ (aq) → Na⁺ (aq) + Mn (s) 5. Al³⁺ (aq) + Cr (s) → Cr³⁺ (aq) + Al (s)

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Chemistry

Frye

Chemical reactions that release energy

A. will not occur.

B. need catalysts to occur.

C. will always explode.

D. often occur spontaneously.

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Chemistry

Noel Gonzalez

Which metal exist in liquid state and can be cut with knife?

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Chemistry

Leandro Kirk

Based on the ionization energies of the alkali metals, which alkali metal would you expect to undergo the least exothermic reaction with chlorine gas?

Express your answer as a chemical symbol.

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Chemistry

Guest

An atom of a particular element is traveling at 1.00% of the speed of light. The de Broglie wavelength is found to be 3.31 * 10-3 pm. Which element is this? Prove it.

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Chemistry

Meadow Page

Is a whale a abiotic or biotic

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Chemistry

Camilla Spencer

If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount. If the half-life of hydrogen-3 is 11.8 years, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount. True False

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Chemistry

Glenn Barker

If element X has 25 protons, how many electrons does it have?

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Chemistry

Aron Porter

How much work is done to raise a 20N box 4m?

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