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Mice21 [21]
4 years ago
5

Elements that do not have full outer electron shells will donate, share, or take electrons from other atoms. Choose the items th

at have the correct binary ionic formula.
Lithium and fluorine form LiF
Potassium and sulfur form KS2
Magnesium and chlorine form MgCl2
Sodium and calcium form Na2Ca
Strontium and oxygen form Sr2O2
Beryllium and nitrogen form Be3N2
Chemistry
1 answer:
Tamiku [17]4 years ago
8 0

it´s actually Lithium and fluorine / Magnesium and Chlorine / Beryllium and Nitrogen

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How do intermolecular forces help explain differences in phase changes (boiling point, melting point)
Ivahew [28]
Do you mean differences among various substances eg: H2O vs CO2? IMFs determine boiling and melting points by deciding how strongly molecules want to hold on to each other. The strength of IMFs depend on the type of IMFs, eg: dipole-dipole, ion-dipole, induced dipole (London dispersion), etc. Weak IMFs= low boiling point. IMFs also determine many other properties including vapor pressure, etc.
3 0
3 years ago
Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?
solong [7]

Answer:

d. 380g

Explanation:

The reaction of production of hydrogen from zinc and HCl is:

Zn + 2HCl → ZnCl₂ + H₂(g)

At STP (1atm of pressure and 273.15K), 112L are:

n = PV /RT

n = 1atm×112L / 0.082atmL/molK×273.15K

<em>n = 5.00 moles </em>

That means you need to produce 5.00 moles of hydrogen. Based on the reaction, 1 mole of Zn produce 1 mole of H₂(g), as yield of reaction is 85%:

5.00 moles H₂(g) ≡ 5.00 moles of Zn / 85% = <em>5.88 moles of Zn you need</em>

As molar mass of Zn is 65.38 g/mol:

5.88 moles Zn × (65.38g /mol) = 384 g of Zn ≡ <em>d. 380g</em>

<em></em>

I hope it helps!

3 0
3 years ago
Calculate the speed of a wave of frequency 50Hz and wavelength 1m?
frutty [35]

Answer:

50m/s

Explanation:

The formula for calculating speed of wave in relation to frequency and wavelength is

C=λf

Where c is the speed of the wag

λ is the wavelength which is 1m

f is the frequency which is 50Hz

From the formulas,

C= 50X1

C= 50m/s

5 0
3 years ago
using the scientific definition of work, does moving an object a greater amount of distance always result in more work?
DochEvi [55]
No. i can go from my house to New York and back in a day since my final destination is the same as my beginning no work is done. if i go 20 ft from the house and stay i would have done more work. displacement is the key
8 0
3 years ago
Phosphoric acid is a triprotic acid ( K a1 = 6.9 × 10 − 3 , K a2 = 6.2 × 10 − 8 , and K a3 = 4.8 × 10 − 13 ). To find the pH of
timama [110]

Answer:

Ka2 values should be used in obtaining pKa2 in the Henderson–Hasselbalch equation

Explanation:

During first dissociation from H3PO4 to H2PO4-, ka1 will be used, and from H2PO4-to HPO4-, ka2 values will be used, hence a buffer solution containing H2PO4-and HPO4-will use ka2 in obtaining pKa2 in the Henderson–Hasselbalch equation.

7 0
4 years ago
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