09/30/20

Consider 0.022 grams of h2(g) produced by following chemical reaction, 2HCI(aq) +Mg(s)---->Cl2(aq)+H2(g)
True or False1)The reaction requires 0.795 grams of HCI(aq)2)The reaction also produces 1.04 grams of MgCl2(aq)3) the number of moles of the reactants consumed will equal the number of moles of the... more
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09/30/20

In a precipitation reaction between BaCl2(aq) and Na3PO4(aq),56.4mL of 0.100M BaCl2(aq) completely reacted with 24.3 mL of Na3PO4(aq).What was the molarity of Na3PO4(aq)?
3BaCl2(aq)+2Na3PO4(aq)------>Ba3(PO4)2(s)+6NaCl(aq)*Numerical value with three decimal places.(No units or chemical in answer)
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09/30/20

7. Which of the following atoms has the largest ionization energy?

a) V b) K c) Cu d) Br 
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09/30/20

6. Which of the following atoms has the smallest atomic radius?

a) V b) K c) Cu d) Br 
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09/30/20

5. Draw the valence orbital diagram for oxygen.

5. Draw the valence orbital diagram for oxygen. O
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09/30/20

4. Draw the complete orbital diagram for magnesium.

Mg is the elelement :) please help me i am begging you :) aaaaaaaaa a a a
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09/30/20

3. Write the abbreviated electron configuration for the following element.

a) silicon 
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09/30/20

2. Write complete electron configurations for each element/ion.

a) germanium b) Cl-1 ion 
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09/30/20

If a solution has a measured % transmittance of 34.4 % at a wavelength of 510 nm, using a UV-vis spectrophotometer, what is the absorbance of the solution at this wavelength?
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09/30/20

Difference between Polar vs Nonpolar Molecules & Polar vs Nonpolar bonds?
Thank you in advance for any answer! I've been really confused in the difference between determining the difference between molecules vs bonds (nonpolar & polar) and where the terms ionic vs... more
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09/29/20

What is the Ideal Gas Law?
The ideal gas law is a combination of laws into an equation that can be used to understand how gases behave.
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09/29/20

Determine the total heat (kJ) required to condense 2.5 x 105 kg of stead at 100.0oC into water and then cool the water from 100.0oC to 0.0oC.
(Csteam = 2.03 J/(g*oC), Cwater = 4.18 J/(g*oC), Cice = 2.06 J/(g*oC), ∆Hvap = 2260 J/g, and ∆Hfus = 334 J/g) 
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09/29/20

What is the molar analytical concentration of solute in an aqueous solution that is: 20.2% w/w HCl and has a density of 1.14 g/mL?
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09/29/20

Hydrogen (H2) gas and oxygen (O2) gas react to form water (H2O) vapor. 
Hydrogen (H2) gas and oxygen (O2) gas react to form water (H2O) vapor. Suppose you have 5.0 mol of (H2) and 11.0 mol of (O2) in a reactor.Suppose as much as possible of the H2 reacts. How much will... more
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09/29/20

Stoichiometry Problem
According to the balanced reaction below, calculate the moles of NO2 that form when 5.20x10^-3 mol of N2O5 completely reacts: 2 N2O5(g) yields 4 NO2(g)+O2(g)
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09/29/20

Which of the following is not evidence of a chemical reaction?
(a.) a color change (b.) a temperature decrease (c.) a new smell (d.) a change in appearance only
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09/29/20

True or False. A bond between a chlorine atom (electronegativity = 3.0) and a fluorine atom (electronegativity = 4.0) will be a polar covalent bond.
Just true or false. No need for explanation if it's too much to explain. Thank you
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09/28/20

Categorize these terms as a physical change or chemical change.
A. FractureB. SublimeC. BakeD. Ferment
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09/28/20

help please. I don't understand
Sodium metal and chlorine gas can be produced industrially by passing an electric current through molten sodium chloride:2 NaCl(l) ⟶ 2 Na(l) + Cl2(g)What volume of Cl at 293 K (20.°C) and 1.00 atm... more
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09/28/20

help me pleaseeeeeee
A typical weather balloon contains approximately 563 L of hydrogen gas when it is released.  If the temperature and pressure at the surface are 288 K and 1.00 atm when the balloon is released, what... more
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09/28/20

A sample of nitrogen occupies 1.00 L at a temperature of 250. K. What volume would it occupy at 1500. K?
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09/28/20

A sample of hydrogen gas has a volume of 4.4 L at a pressure of 800. torr. If the pressure decreases to 400. torr, what will the new volume be?
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09/28/20

titrations lab report

how do tirtrations compare to limiting/ excess reagents?
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09/28/20

What mass in grams of ammonia can be made from 120 g of H2?
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09/28/20

How many mL of 1.00 M sulfuric acid are required to neutralize 25.0 mL of 4.00 M NaOH?

How many mL of 1.00 M sulfuric acid are required to neutralize 25.0 mL of 4.00 M NaOH?(start by writing the balanced equation for this acid-base reaction)
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