Chemistry » Page 72

Chemistry

Natalya

Which of the following is a strong repulsive force in an atomic nucleus?

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Chemistry

Kennedy Spears

Which process involves the transformation of liquid water into gaseous water vapor in the water cycle?

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Chemistry

Frederick

Summarize rutherford's model of an atom, and explain how he developed thus model based on the results of his famous gold-foil experiment

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Chemistry

Abram Watkins

Which of these is not an organism humans, mold, bacteria, lungs

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Chemistry

Yair Schroeder

Select all that apply. Which two of the following equations represent an exothermic reaction? NH3 (g) + 12.0 kcal → ½N2 (g) + 3/2H2 (g) C (graphite) → C (diamond), ΔH = - 0.45 kcal/mole C C + 2S → CS2, ΔH = 27,550 cal CH4 + 2O2 → CO2 + 2H2O + 212,800 cal 2H2 O → 2H2 + O2, ΔH = + 58 kcal/mole H2O

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Chemistry

Catalina

The synthesis of water proceeds according to this equation:

2H2 (g) + O2 (g) arrow to 2H2O (g)

How can the rate of this reaction be increased?

A. by increasing the temperature of the reactants

B. by increasing the temperature of the products

C. by decreasing the temperature of the reactants

D. by decreasing the temperature of the products

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Chemistry

Jeffrey Mckee

What is the symbol for the element sodium?

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Chemistry

Guest

The hcl (g) molecule has a bond length of 127 pm and a dipole moment of 1.08

d. without doing detailed calculations, determine the best estimate for its percent ionic character.

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Chemistry

Diamond Jacobson

Which of the following statements is false for the chemical equation given below? Assume the reaction goes to completion. N_2+3 H_2→2 〖NH〗_3 The reaction of 1 mole of H2 will produce 2/3 mole of NH3 1 mole of N2 will produce 2 moles of NH3 1 molecule of nitrogen requires 3 molecules of hydrogen for a complete reaction The reaction of 14 g of N2 produces 17 g of NH3 The reaction of 3 moles of H2 gas will produce 17 g of NH3

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Chemistry

Patrick Cameron

1. do mustard and soil have a dependent or interdependent relationship?

2. do crickets and grass have a dependent or interdependent relationship?

3. are isopods and dead leaves dependent or interdependent?

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Chemistry

Dayton Mcbride

Friction is not related to the efficiency of a machine.

True

False

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Chemistry

Kenneth Patterson

Who were the scientist associated with the concept of atomic orbitals?

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Chemistry

Evangeline Daniel

Look at the following hypothetical reaction: A + 4B - C + 3D. Assume that the equation is balanced. Which of the following mole ratios will produce the most product?

a) A/B

b) A/4B

c) 3A/4B

d) 4A/B

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Chemistry

Briana

A gas cylinder contains 2.5 atm of ne, 0.8 atm of co2, and 3.4 atm of ar. what is the total pressure in the cylinder? g

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Chemistry

Quinten Kramer

Silicon-30 contains 14 protons. It also contains?

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