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Chemistry

Big Nasty

What is the sum of the coefficients in the balanced chemical equation for the combustion of acetone, c3h6o (l), in air?

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Chemistry

Guest

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?

1) 1 mol of oxygen has fewer molecules.

2) 1 mol of oxygen has more molecules.

3) Each sample has the same number of molecules.

4) The molecules cannot be compared without knowing the mass.

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Chemistry

Kaitlyn Kaiser

Which statement describes a reaction at equilibrium?

1. The mass of the products must equal the mass of the reactants

2. The entropy of the reactants must equal the entropy of the products

3. The rate of formation of the products must equal the rate of formation of the reactants.

4. The number of moles of the reactants must equal the number of moles of the products.

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Chemistry

Gilberto Ho

If you dilute 25.4mL of a 3.5M solution to make 166.7mL of solution, what is the molarity of the dilute solution

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Chemistry

Maestro

What can you tell about an atom that has high electronegativity?

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Chemistry

Mariela Perkins

Which of the following bonds is the most polar in nature? (1) Cl (3) HBr (4) HI (2) HCl

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Chemistry

Tom

What is the balanced form fir Na (s) + ao2 (g) = Na2O (s)

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Chemistry

Savion Wall

You place a book on your desk, and then you begin to lift one edge of the desk. You make the following observations: At first the book does not move. When you lift the desk edge higher, the book begins to slide slowly. As you lower the desk slightly, the book slows down, then stops. Use your knowledge of forces and friction to explain your observations.

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Chemistry

Jaeden Watkins

Oxidation-reduction is often the most confusing and abstract part of chemistry for first-time chemistry students. Is it really worth the trouble? Think about the various chemical reactions that impact your life and society daily. Now, which ones are oxidation-reduction reactions versus some other type of reaction? Think about these reactions-redox or not-and take a reasoned position about the importance of redox reactions in our lives.

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Chemistry

Elena Barajas

at 25c, 13.0 mg of co dissolves in 500g of water when the partial pressure of co is 0.968 bar. what is the henry's law constant for co at this temperature

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Chemistry

Jakobe

In which of the following substances can a lipid NOT dissolve?

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Chemistry

Trace Mccullough

Balance these scientific equations:

MgO + HB - > MgBr2 + H2O

N2 + O2 - > N2O5

C2H4 + O2 - > CO2 + H2O

Fe + HCI - > FeCl2 + H2

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Chemistry

Allisson Beck

If we want to produce pure aluminum (Al) using AlCl3 as a reactant, what other reactants should we use?

A. Fe

B. Ni

C. Au

D. Li

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Chemistry

Uriah Montes

A system uses 49 J of energy to do work, and the change in internal energy is 58 J. How much heat was added to the system?

9 J

97 J

107 J

117 J

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Chemistry

Guest

What best explains the reason solids have a definite shape and volume? A. the molecules in solids move past each other easily. B. the molecules in solids stay in a definite location and vibrate. C. the molecules in solids move freely in all directions. D. the molecules in solids do not move at all.

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