Chemistry » Page 38

Chemistry

Porche

You are asked to analyze an aqueous solution (X) and determine what's in it. You pour some of your sample X into a test tube and add a few drops of an acid. No observable reaction occurs. Then you add a few drops of barium chloride solution to your mixture (containing an aqueous solution X and the acid), a white precipitate forms.

1. What can you conclude about the solution X, based on this experiment?

(Circle as many choices as applies.)

A. Solution X must contain a covalent (molecular) compound.

B. Solution X does not react with barium chloride.

C. This experiment is inconclusive, and does not provide any information about the contents of X.

D. Solution X must contain sulfate ion.

E. Solution X does not contains any ionic compound.

F. The solution X contains an ionic compound.

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Chemistry

Cooper Knox

Which of the following items represents a chemical change? burning

melting

evaporation

freezing

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Chemistry

Myles Schultz

In what phase of matter do particles fill the entire container in which their placed?

A. Liquid

B. Gas

C. Solid

D. Frozen

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Chemistry

Kamden Strong

A substance that permits the flow of electrons is a (n

a. conductor

b. insulator

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Chemistry

Jeremiah Berg

If 1/8 of an original sample of krypton-74 remains unchanged after 34.5 minutes, what is the half life of krypton-74?

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Chemistry

Hayley Alvarez

If a measurement is recorded as 1.2 cm what's the smallest marking on the instrument

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Chemistry

Dayton Colon

Why do the ions in an ionic bond stay together, aka form the bond?

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Chemistry

Guest

Is it ever possible to extract 100% of a compound from a solution? Why or why not?

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Chemistry

Henry Joseph

Covalent, ionic, and metallic are the three types of attraction between atoms.

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Chemistry

Kaliyah Tapia

A red blood cell has a round structure. A muscle cell has a long, thin structure. Which statement best explains why these two types of cells have different structures

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Chemistry

Boozer

Does oxidation cause misfolding of protein

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Chemistry

Hayden Schwartz

A solution is a homogenous mixture of solute and solvent. There are different types of solutions. A carbonated drink is an example of a solution where the solute is a gas and the solvent is a liquid. Sugar crystals dissolved in water is an example of a solution where the solute is a solid and the solvent is liquid. Acetic acid is miscible in water, forming a solution commonly known as vinegar. In this case, both the solute and the solvent are liquids. The solubility of solute in a solvent depends on various parameters, such as temperature, pressure, the nature of the solute, and the nature of the solvent. Considering these parameters, identify the statements that are correct for the solubility of a solute in a solvent.

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Chemistry

Reina

Nitrogen molecules rest with oxygen molecules. Nitrogen monoxide molecules are made.

N2 + O2 → 2NO

Nitrogen molecules and oxygen molecules react extremely slowly, even at 200°C.

The reaction between nitrogen

and oxygen becomes faster as both the temperature and the pressure increase. Explain why, using the reacting

particle model. (6 marks)

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Chemistry

Guest

What is the name of an object containing both elements #29 and 30 with element #30 in the center surrounded by element #29?

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Chemistry

Jordin

Check every statement about the use of energy by living things that is true. Plants perform chemical reactions that require energy. Animals can use energy from the sun to produce their own food. Plants receive their energy from water in the soil. Animals can receive their energy by consuming plants or other animals.

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