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Chemistry

NaCl

in roman numerals

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Giovanna Middleton

Chemistry

A compound has an empirical formula of C2H6. What additional piece of evidence is needed to determine the molecular formula?

a. percent composition of carbon

b. mass of the sample

c. relative numbers of atoms of each element

d. molar mass of the compound

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Shannon Hammond

Chemistry

Educated guess about the meaning of the word atom

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Chemistry

Which of the following symbols could represent an atom of an element

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Chemistry

How many sugar molecules are in a 3 M sugar solution (V=1L) ?

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Chemistry

Which element would you expect to be less metallic?

(a) Cs or Rn (b) Sn or Te (c) Se or Ge

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Chemistry

Which of these planets are cassini currently orbiting

Mars

Saturn

Mercury

Jupiter

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Chemistry

La temperatura a la cual las partículas de los gases no se mueven es:

1) Cero grados centigrados

2) 273 K

3) cero absoluto

4) cero grados Fharenheit

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Chemistry

What appears to happen to the moon as it goes through the cucle

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Chemistry

When H2 and CO2 react, acetic acid can be formed spontaneously while the production of formaldehyde requires an input of energy.

Which of the following conclusions may be drawn from this observation?

A) The mineral catalyst involved in acetic acid production provides energy to make the reaction spontaneous.

B) More heat is released when formaldehyde is produced compared to the production of acetic acid.

C) Entropy decreases when acetic acid is produced and increases when formaldehyde is produced.

D) Compared to the reactants from which it is formed, formaldehyde has more potential energy than does acetic acid.

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Chemistry

What is the enthaply of the reaction?

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Alicia Garrison

Chemistry

Which color has a higher frequency,

A. red light

B. blue light

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Chemistry

what is the volume of 0.98 mol oxygen (O2) gas at 275 K and a pressure of 2.0 atm? (the universal gas constant is 0.0821 L*atm/mol*K)

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Chemistry

Which element is classified as an alkali metal? Rb Sr Zr Cl

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Chemistry

Which statements about a neutral atom are correct? Check all that apply. The positively charged particles in the nucleus are positrons. The radius of the electron cloud is twice as large as the radius of the nucleus. A neutral atom is composed of both positively and negatively charged particles. Positively charged protons are located in the tiny, massive nucleus. The electrons are attracted to the positively charged nucleus. The negatively charged electrons are spread out in a "cloud" around the nucleus.

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