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3 years ago

Based on electronegativity differences, which bond is a polar covalent bond?

Chemistry

1 answer:

mojhsa [17]3 years ago

4 0

Answer:

A bond in which the electronegativity difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond.

A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal.

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How objects with different masses and volumes have the same density?

AURORKA [14]

Answer:

mass and volume are independent. Two objects with the same volume can have different masses hence they can have different densities

Explanation:

The mass of atoms their size and how they are arranged determine the density

6 0

3 years ago

Which eletric configuration represents an atom of lithium in an excited state?

Naya [18.7K]

Answer:

2-0-1, 1-1-1, 0-1-2, but they must all equal 3 electrons in total

Explanation:

5 0

3 years ago

Can one of you guys help me get this?

Lostsunrise [7]

Carbon, Nitrogen, and Oxygen all have the same number of energy levels because periods (rows) tell the amount of energy levels an element has.

5 0

3 years ago

A 30-0 g sample of water at 280 K is mixed with 50.0 g of water at 330 K. How would you calculate the final temperature of the m

aliya0001 [1]

Answer:

311.25k

Explanation:

The question assumes heat is not lost to the surroundings, therefore

heat emitted from hotter sample ( $q_{\ lost}$ )= heat absorbed by the less hotter sample( $q_{\ gain}$ )

The relationship between heat (q), mass (m) and temperature (t) is $q = mc\Delta t$

where c is specific heat capacity, $\Delta t$ temperature change.

$\Delta t$ = $t_{\ final} - t_{\ initial}$

equating both heat emitted and absorb

$-q_{\ lost} = q_{\ gain}$

$-m_{1}(t_{\ final} - t_{\ 1initial})=m_{2}(t_{\ final} - t_{\ 2initial})$

where the values with subset 1 are the values of the hotter sample of water and the values with subset 2 are the values of the less hot sample of water.

C will cancel out since both are water and they have the same specific heat capacity.

so we have

$-m_{1}(t_{\ final} - t_{\ 1initial})=m_{2}(t_{\ final} - t_{\ 2initial})$

where m1 = 50g, t 1initial = 330, m2 = 30g, t2 initial = 280,t final (final temperature of the mixture) = ?

-50 * ( $t_{final}$ - 330) = 30 * ( $t_{final}$ - 280)

-50 $t_{final}$ + 16500 = 30 $t_{final}$ - 8400

80 $t_{final}$ = 16500+8400

80 $t_{final}$ = 24900

$t_{final}$ = 24900/80 = 311.25k

8 0

3 years ago

How many liters of hydrogen gas at stp are produced from the reaction of 50.0g of magnesium and 75g of hydrochloric acid

ss7ja [257]

Here's how to do it:

Balanced equation first: 
Mg + HCl = H2 + MgCl2 unbalanced 
Mg + 2 HCl = H2 = MgCl balanced 
Therefore 1 mole Mg reacts with 2 moles Hcl. 
50g Mg = ? moles (a bit over 2; you work it out) 
75 g HCl = ? moles (also a bit over 2; you work it out) 
BUT, you need twice the moles HCl; therefore it is the Mg that is in excess. (you can now work out how many moles are in excess, and therefore how much mg is left over). 

So, 2 moles HCl produce 1 mole H2(g) 
therefore, the amount of H2 produced is half the number of moles of HCl 
At STP, there are X litres per mole of gas (look it up - about 22 from memory) 
Therefore, knowing the moles of H2, you can calculate the volume

8 0

4 years ago