CHEMISTRY HIGH SCHOOL

In the third period of the periodic table, sodium is followed by magnesium, aluminum, silicon, and phosphorus. Which of these elements has the smallest atomic size?

Answers

Answer 1
Answer:

Answer:  (E)       Phosphorus

Explanation: PLATO
Answer 2
Answer:

Answer:

E.

Explanation:

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The geometry for boron atom in F3B-NH3 is...A) trigonal pyramidal
B) tetrahedral
C) trigonal bipyramidal
D) bent

Answers

Boron is bonded to four different atoms, the most stable configuration, and the only configuration that it can have is tetrahedral.

Enter the molecular formula for butane, C4H10.
Express your answer as a chemical formula.

Answers

Butane is from the family of alkanes with –ane as its family name. The but- prefix stands for having four carbon atoms. The C4H10 is the general formula of butane and can also represent other forms or structures of butane. However if the question asks for the molecular formula of butane, think of how many electrons it can share to the hydrogen atom. The carbon atom can share 4 and hydrogen 1.  So if the three hydrogen atoms are attached to the first carbon, the other shared electron is attached to the second carbon. The second carbon atom can accommodate two hydrogen and 1 carbon. The third carbon can accommodate 2 hydrogen atoms and 1 carbon and the fourth carbon can accommodate 3 hydrogen atoms. The molecular formula is CH3-CH2-CH2-CH3.

How many molecules (not moles) of nh3 are produced from 6.62×10−4 g of h2?

Answers

N₂(g) + 3 H₂(g) = 2 NH₃(g)       molar mass N₂ = 28.0 g/mol
                                                                     NH₃ = 17.0 g/mol

14 g N₂ ---------------> 2 x 17 g NH₃
6.62 x 10⁻⁴ g --------> ?

Mass NH₃ = ( 6.62 x 10⁻⁴ ) x 2 x 17 / 14

Mass NH₃ = 0.022508 / 14

Mass NH₃ = 0.00160 g

number of moles = 0.00160 / 17 =  9.41 x 10⁻⁵ moles

1 mole ----------------------- 6.02 x 10²³ molecules
9.41 x 10⁻⁵ moles ----------  ?

molecules NH₃ =  ( 9.41 x 10⁻⁵ ) x ( 6.02 x 10²³ ) / 1

= 5.66 x 10¹⁹  molecules of NH₃

hope this helps!

What is the mass of 4.23×10^23 atoms of iron

Answers

First divide atoms by Avogadro's number:
(4.32x10^23)/(6.02x10^23) = .703mol Fe

Then multiply moles by its molar mass:
(0.703mol Fe)(55.85g/mol Fe) = 39.24g Fe

HELP DUE TOMMOROW! FAILING CLASS!!! When it would be appropriate to use Radiocarbon dating, Rubidium-Strontium dating, Uranium-Lead dating, and Potassium-Argon dating. Include if the types of dating are used for organic or inorganic things and the time range they are useful for.

Answers

Answer:

Uhm if you're failing the class why are you still using brainly to get answers... Where's your momma boy?

Explanation:

It izzz what it izzz

Which aqueous solution will cause the bulb to light?

Answers

LiOH(aq)

Hope this helps :)
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The process of ionic bonding is not the same as the process of metallic bonding. Which of the following statements is trueabout these processes?1. In ionic bonding, only ions of the same element combine to form a compound.2. In metallic bonding, valence electrons can move freely between atoms.3. Substances formed through ionic bonding are not considered compounds.4. In metallic bonding, electrons are transferred between elements in fixed ratios.