Chemistry » Page 90

Elizabeth Wheeler

Chemistry

Semi-conductors have properties of both metals and non metals. which are two examples of metalloids

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Chemistry

How do you determine the percent yield of a chemical reaction?

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Chemistry

What is a property of a combustion reaction?

A. Oxygen gas, O2, is a reactant.

B. The products are simpler than the reactants.

C. The reactants are simpler than the products.

D. An uncombined element is on the reactant and product side.

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Chemistry

For an endothermic reaction at equilibrium, the addition of a catalyst

Group of answer choices

causes no shift

causes a shift to the right

causes a shift to the left

makes it an exothermic process

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Chemistry

The atomic number of an element best corresponds to which of the following?

O The mass of an atom of that element.

O The number of electrons orbiting the nucleus of an atom of that element.

O The number of protons in the nucleus of an atom of that element.

O The number of neutrons in the nucleus of an atom of that element.

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Francisco Marks

Chemistry

If a dinosaur once lived in mexico, and i now live in arkansas, can i be drinking the same water the dinosaur did?

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Chemistry

Dough to which potassium bromate has been added rises better, producing a lighter, larger volume loaf.

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Chemistry

Each enzyme has an optimal temperature and pH that it works best in. If enzyme ABC works best at pH 7, but ABC is in a cell with a pH of 9, will it catalyze more or less reactions?

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Chemistry

What is the molarity of a solution that contains 5.0 moles of solute in 2.0 liters of solution?

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Chemistry

Area immediately surrounding a hazardous material incident which extends far enough to protect personnel outside the zone from contamination.

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Chemistry

What is the smallest part of a tree that can do all the things needed for life?

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Carlos Dominguez

Chemistry

What are solid mixtures in a avarage class

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Chemistry

You notice that when the parchment paper of an ancient document is exposed to a certain chemical, the parchment paper becomes a different color. what have you done?

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Chemistry

Suggest how blowing oxygen into molten cast iron removes most of the carbon

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Chemistry

In the reaction 2H2 + O2-->2H2O how many hydrogen molecules are needed to produce two water molecules

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