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Collins
Chemistry
What is the pH of a 1.0 X 10 - M solution of nitric acid?
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Skyler Bauer
Chemistry
Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations? The mixture is a solution because it has the same appearance throughout the sample. The mixture is a suspension because it is composed of two different-appearing substances. The mixture is a heterogeneous mixture because one liquid is dissolved in the other. The mixture is a colloid because two different substances can be seen in a small sample.
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Flopsy
Chemistry
The density of a gas is measured at 1.653 g/L at 746 mmHg and 25.0 °C. What is its molar mass?
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Guest
Chemistry
What significant contribution did Lavoisier make to chemistry?
A. He was the first to use scientific experiments to learn about
atoms.
B. He was the first to discover the atom.
C. He was the first to propose the atomic theory.
D. He was the first to split the atom.
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Makai Stewart
Chemistry
How do you calculate average percent yield?
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Bugsey
Chemistry
Identify the medium for the following waves:
• The Wave Exercise waves:
• Ripples on a pond:
• Sound waves from a stereo speaker:
• Seismic (earthquake) waves:
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Helena Trevino
Chemistry
What is most believed by most scientists about the age of our solar system.
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Brennen
Chemistry
Just as heat can denature enzymes, so can a change in the pH. Enzymes that normally work in an acidic environment in the body can become denatured if the pH becomes too alkaline. And enzymes that normally work in alkaline environments in the body can become denatured if the pH becomes too acidic. Taking an antacid to reduce the acidity (and increase the pH) of the stomach and to relieve heartburn can make a person more comfortable. What would be the major drawback to taking too many antacids?
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Reginald Bass
Chemistry
In a reversible reaction, both the forward and reverse reactions take place
A. at the same rate.
B. at two different rates.
C. at varying, unequal rates.
D. under different experimental conditions.
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Isaiah Santos
Chemistry
Choose the element that would be the most reactive of the three.
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Costa
Chemistry
Por qué dos iones sodio reemplazan un ion de calcio o de magnesio
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Marcel Harrell
Chemistry
How and when did scientists discover cells
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Dante
Chemistry
How many grams of compound are present in 4.18 grams of K2HPO4
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Adyson Joyce
Chemistry
What does the first law of thermodynamics say?
A. Energy cannot be stored in any form.
B. Energy cannot be created or destroyed.
C. Energy cannot move within a system.
D. Energy cannot enter or leave a system,
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Makhi Trujillo
Chemistry
How did the experiement with the iron filings and sulfur compare with the experiment in which copper sulfate pentahydrate was heated?
Both resulted in gas formation.
Both resulted in color change.
Both involved chemical change.
Both involved physical change.
One involved chemical change while the other involved physical change.
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