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Chemistry

Emily House

When a calorimeter is used, no thermal energy is exchanged between the contents of the container and the outside air. If an exothermic reaction is conducted inside a calorimeter filled with water, which of the following statements best describes what occurs during the reaction?

The thermometer will show an increase in the water's temperature.

The total energy of the reaction will increase.

The reaction will absorb thermal energy from the surroundings.

The potential energy of the reactants will be lower than that of the reactants.

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Chemistry

Guest

When adjusted for any changes in δh and δs with temperature, the standard free energy change δg∘t at 2400 k is equal to 1.22*105j/mol. calculate the equilibrium constant at 2400 k.?

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Chemistry

Jan Shepard

What symbol represents "yields" or "forms" in a chemical reaction?

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Chemistry

Arthur Dean

Hydrazine (N2H4) is a chemical compound used in rocket fuel. Which of the following represents the correct balanced equation for the reaction of hydrazine liquid with oxygen gas to produce nitrogen gas and steam? A. N2H4 (l) + O (g) N (g) + H2O (g) B. N2H4 (l) + 2 O (g) 2 N (g) + 2 H2O (g) C. N2H4 (l) + O2 (g) N2 (g) + 2 H2O (g) D. N2H4 (l) + O2 (g) N2 (g) + H2O (g)

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Chemistry

Paisley Michael

Boyle's law is represented by which equation

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Chemistry

Cheyenne Rollins

A hot-water heater has an 8-ohm element that operates at 240 V. The power that's consumed by this water heater is A. 1,920 W. B. 30 W. C. 900 W. D. 7,200 W.

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Chemistry

Leonidas Tucker

A car travels 66 kilometers in 3 hours. what is its speed

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Chemistry

Efrain Zimmerman

Which of the following elements has the lowest ionization energy? Rb Sr Cs Ba Xe

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Chemistry

Ace Foley

Which is a diatomic molecule?

Select one:

a. CH4

b. H2O

c. O2

d. N

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Chemistry

Ashtyn Bass

Everyone reacts to stress in the same way.

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Chemistry

Nora Meyers

What is the molarity of a solution made by dissolving 29.5 g of sodium hydroxide (NaOH) in enough water to make 2.45 L of solution?

Molar Mass Na: 22.99 g/mol

Molar Mass O: 16.00 g/mol

Molar Mass H: 1.008 g/mol

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Chemistry

Grady Johns

Is romano cheese an element, compound, homogeneous mixture, or heterogeneous mixture?

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Chemistry

Guest

How many shells are occupied in atoms of elements in period 4?

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Chemistry

Aleah Petersen

Parts per million (ppm) is a common way to express small concentrations of a solute in water. A sample of tap water that is 25 ppm Cl-Cl - contains 25 grams of Cl-Cl - for every 1,000,000 grams of water. Which units are numerically equal to ppm for dilute aqueous solutions?

A. μg/L

B. cg/L

C. ng/L

D. mg/L

E. g/L

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Chemistry

Allan Kirk

The Florida maple tree is flowering plant. The Florida long leaf pine tree is nonflowering plant. Both trees go through various stages in their life cycles. Which stage is found in the life cycles of both?

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