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Chemistry

Duncan Rivas

Which of the are not true in regarding to atomic raqdii of main group elements.

a. Atomic radii generally increase as you move from left to right across a period

b. atomic radii size is related to the number of electrons in the valence level and the number of protons in the nucleus.

c. atomic radii decrease size when the pull of electrons forward the nucleus of an atom is greater

d. atomic radii generally increase as you move down a group

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Chemistry

Fletcher Aguirre

At constant pressure, the combustion of 5.00 g of c2h6 (g) releases 259 kj of heat. what is δh for the reaction given below? 2 c2h6 (g) + 7 o2 (g) → 4 co2 (g) + 6 h2o (l).

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Chemistry

Gilberto Ho

Express the value of exactly 15 centimeters to three significant figures.

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Chemistry

Kaylyn Rowland

A solution is made by completely dissolving 90. grams of kno3 in 100 grams of water in a beaker. the temperature of this solution is 65 degrees celsius. describe the effect on the solubility of a gaseous solute in this solution when the pressure on the solution increases

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Chemistry

Newt

A 10g mass of krypton occupies 15.0 l at avpressure of 210 kpa. find the volume

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Chemistry

Timothy Bautista

What does a substance in solid fase has

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Chemistry

Caesar

What are the three requirements for an effective collision

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Chemistry

Antoine Vazquez

What is the force applied when using a simple machine.

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Chemistry

Maliyah Terry

Select all that apply. when the products of a reaction have more energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants gave up energy. the δh is positive.

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Chemistry

Guest

How can you determine the number of valence electrons in an atom of a representative element?

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Chemistry

Peter Nixon

Find the cube root of 2.7*10^10

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Chemistry

Izabelle Herman

What is the mass of one mole of titanium atoms

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Chemistry

Kadyn Henry

What is the importance of flame test in laboratory?

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Chemistry

Pittman

How has the Internet changed communication in the environmental sciences?

A. It has made the spread of information faster and easier.

B. It has made information more trustworthy.

C. It has narrowed the focus of communication to a small audience of specialists.

D. It has disproven several scientific theories.

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Chemistry

Rachel Page

Which substance has a molar mass of 133.3 g? BaCl2 P2O5 AlCl3 MgCl2

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