How many atoms are all in one molecule of ferric sulfide

This is a graded Quiz and I need all of the answers to be right but I am not sure so I need help this is a 3.08 science Quiz and

Setler79 [48]

Answer:

1 true

Explanation:

bcz it is true

8 0

3 years ago

1. Before starting, make a prediction: If substances B and C are both in the gas phase and are at the same energy level, which o

shutvik [7]

Answer:

ttttt

Explanation:

4 0

2 years ago

Read 2 more answers

The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error

JulijaS [17]

Answer:

$1.35\times 10^{-4} M$ was the concentration of the original solution.

Explanation:

$M_1V_1=M_2V_2$ (Dilution)

where,

$M_1\text{ and }V_1$ are molarity and volume of non diluted sample.

$M_2\text{ and }V_2$ are molarity and volume of diluted sample.

$M_1=?$

$V_1=100.0 \mu L=0.1 mL$

(1μL=0.001 mL)

$M_2=6.41\times 10^{-6} M$

$V_2=2.00 mL + 100.0 \mu L=2.00 mL+0.1 mL=2.1 mL$

Substituting all values :

$M_1\times 0.1 mL=6.41\times 10^{-6} M\times 2.1 mL$

$M_1=\frac{6.41\times 10^{-6} M\times 2.1 mL}{0.1 mL}=1.35\times 10^{-4} M$

$1.35\times 10^{-4} M$ was the concentration of the original solution.

5 0

3 years ago

What is the pH of a solution with a 1.50x10-9 M hydroxide ion concentration?

dimaraw [331]

Answer: 5.18

Explanation:

Mathematically, pOH is expressed as

pH = -log(OH-)

where OH-is the concentration of hydroxide ion

So, pOH calculations are as follows

pOH = -log(1.50x10-9 M)

pOH = -(-8.82)

pOH = 8.82 [the two minus signs cancelled out]

Since pOH = 8.82; apply the formula

pH + pOH = 14 to get pH of the solution

Hence, pH + pOH = 14

pH + 8.82 = 14

pH = 14 - 8.82

pH = 5.18

Thus, the pH of a solution with a 1.50x10-9 M hydroxide ion concentration is 5.18 (slightly acidic)

4 0

4 years ago

According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule? 2p on N overlaps with 2s on H 2s on N o

Alecsey [184]

Answer:

$sp^{3}$ on N overlaps with 1s on H.

Explanation:

Hybridization of central atom generally can be found by finding the hybridization number.Hybridization number is the sum of number of lone pairs and number of sigma bonds.

If hybridization number is 2 then the central atom is sp hybridized.

If it is 3 it is $sp^{2}$ hybridized.

If it is 4 it is $sp^{3}$ hybridized and so on.

Here in $NH_{3}$ molecule there are 3 sigma bonds and one lone pair(see the figure attached).

Hence hybridization number is 4 and hence it is s $p^{3}$ hybridized.

And in case of hydrogen atom the only electron of it resides in the 1s orbital.

Therefore $sp^{3}$ on N overlaps with 1s on H.

8 0

3 years ago