Chemistry » Page 13

Chemistry

Kayden Barton

When atoms react they form a chemical bond which is defined as

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Chemistry

Boston Shepherd

Describe the difference between the terms "mass number" and "atomic mass".

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Chemistry

Walsh

Do you think that crocodiles share a common ancestor with birds, dolphins and dogs

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Chemistry

Ruben Ryan

If an atom has 28 protons and 29 neutrons, what is the mass?

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Chemistry

Karilyn

Aqueous concentrated nitric acid is 69% HNO3 by weight and has a density of 1.42 g/mL. What is the molarity of this solution?

What is the molality of the solution?

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Chemistry

Myles Mccann

As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element

(1) decreases

(2) increases

(3) remains the same

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Chemistry

Jayson Clements

What is the concentration of an acid with a pH of 2?

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Chemistry

Andy Yates

g Assuming that the specific heat of the solution is 4.18 J / (g⋅∘C), that its density is 1.00 g/mL, and that the calorimeter itself absorbs a negligible amount of heat, calculate ΔH in kilojoules for the reaction. H2SO4 (aq) + 2NaOH→2H2O (l) + Na2SO4 (aq) Express your answer using two significant figures.

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Chemistry

Lorenzo Bowman

Calculate the percent ionization of 0.0075 m butanoic acid (ka = 1.5 x 10-5) in a solution containing 0.085 m sodium butanoate.

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Chemistry

Dominic Michael

A gas has a volume of 5.0 L at a pressure of 50 KPa. What happens to the volume when the pressure is increased to 125?

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Chemistry

Ann Hudson

What is the molar mass of Fe2Br3?

1.35 x 10^2 g/mole

3.27 x 10^2 g/mole

3.51 x 10^2 g/mole

8.14 x 10^2 g/mole

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Chemistry

Macie Oneill

A gas with a volume of 5.0 L at a pressure of 215 kPa is allowed to expand to a volume of 14.0 L. What is the pressure in the container if the temperature remains constant?

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Chemistry

Dakota Frost

Sunita carries out an experiment to investigate diffusion. She uses water and a food dye to find out how the volume of water used affects the time the dye takes to spread evenly through the water. Her prediction is that the more water she uses, the longer the time needed for the dye to spread through it. Which variable will she change?

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Chemistry

Larissa Bruce

How are coefficients used to balance chemical equations?

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Chemistry

Daisy Olson

2. Convert 340,000 to scientific notation

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