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Chemistry

Monique May

How can you tell if a chemical change has occurred?

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Chemistry

Eva Martin

Which situations will NOT increase the reactions rate of most chemical reactions A) an increase in temperature

B) grind up the solute to increase surface area before mixing

C) by increasing the pressure in which the reaction takes place

D) decreasing the concentrations of the substances in the reaction

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Chemistry

Cason Ferrell

The rate constant for a first-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is 0.33 M?1.8 s1.3 s0.089 s5.6 s0.31 s

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Chemistry

Rolando Morrison

Arrange the following alkyl bromides in order from most reactive to least reactive in an SN2 reaction: 1-bromo-2-methylbutane, 1-bromo-3-methylbutane, 2-bromo-2-methylbutane, and 1-bromopentane.

Rank the alkyl bromides from most reactive to least reactive. To rank items as equivalent, overlap them.

And what makes an alkyl bromide more reactive in this case?

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Chemistry

Jayla

A sample of pure lithium contains 7.99% lithium by mass. What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?

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Chemistry

Nathalie Ochoa

Which element is in the same period as Na, Li, or, Mg

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Chemistry

Aurora Crosby

NH4 + (aq) + OH - (aq) + H + (aq) + Cl - (aq) →NH4 + (aq) + Cl - (aq) + H2O (l). What is its net ionic equation?.

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Chemistry

Alissa

What is milk best described as? solution, suspension, compound, or colloid?

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Chemistry

Rigoberto Paul

What is the density of the marble when the mass = 10g

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Chemistry

Cello

What is the difference between polar and nonpolar bonds

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Chemistry

Serena

How many grams of AgNO3 are needed to prepare a 0.25 m solution in 500 grams of water?

Question 2 options:

125 g

0.125g

21.25 g

170g

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Chemistry

Reese

What is the name of the chart that organizes elements in order of chemical properties?

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Chemistry

Sarai Haley

In a convection current, why does cool air take the place of warmer air?

A. Cool air is less dense than warm air, so it sinks to take the place of rising warm air.

B. Cool air is denser than warm air, so it sinks to take the place of rising warm air. C. Cool air is less dense than warm air, so it rises to take the place of sinking warm air.

D. Cool air is denser than warm air, so it rises to take the place of sinking warm air.

this is science

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Chemistry

Destiney Reed

Where would the gravitational attraction between the earth and moon be the weakest

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Chemistry

Guest

According to the all-or-none principle, what would happen if a cell were depolarized twice the normal amount needed to produce an action potential?

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