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3 years ago

How to identify Double replacement

Chemistry

1 answer:

BARSIC [14]3 years ago

6 0

Answer:

The easiest way to identify a double displacement reaction is to check to see whether or not the cations exchanged anions with each other.

Explanation:

if the states of matter are cited, is to look for aqueous reactants and the formation of one solid product (since the reaction typically generates a precipitate).

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Is anyone good at chemistry if so can someone please help me NO LINKS PLEASE

joja [24]

Answer:

1. Mass of New atom = 208

2. Atomic number of the new atom is 82

3. Symbol of the new atom is Pb

Explanation:

²¹²₈₄Po —> ⁴₂He + ᴬZX

1. Determination of the mass A of the new atom.

212 = 4 + A

Collect like terms

212 – 4 = A

208 = A

A = 208

Therefore, the mass of the new atom is 208

2. Determination of the atomic number of the new atom.

84 = 2 + Z

Collect like terms

84 – 2 = Z

82 = Z

Z = 82

Therefore, the atomic number of the new atom is 82

3. Determination of symbol of the new atom

The atomic number of the new atom is 82. Comparing the atomic number of the new atom (i.e 82) with those in the periodic table, the new atom is Lead.

Lead has a symbol of Pb

Thus,

Mass of new atom (A) = 208

Atomic number of new atom (Z) = 82

Symbol of new atom (X) = Pb

Therefore,

ᴬZX = ²⁰⁸₈₂Pb

3 0

3 years ago

What is the [H+] concentration of a solution with a pH of 3.78

lianna [129]

Answer:

[H+] = 1.66 x $10^{-4}$

Explanation:

To find the [H+] concentration of a solution, we can use the formula:

$[H+] = 10^{-pH}$

Let's plug in the pH.

$[H+] = 10^{-3.78}$

Evaluate the exponent.

[H+] = 1.66 x $10^{-4}$

Hope this helps!

6 0

3 years ago

A truckload of apples weighs 2550 lbs. If 5 (exact) apples weigh 1250 g, how many apples are in the truck?

egoroff_w [7]

Answer:

There are 4,626 apples in the truck.

Explanation:

Mass of 5 apples = 1250

Mass of an apple = $\frac{1250 g}{5}=250 g$

Mass of apples in the truck = 2550 lbs

1 lbs = 453.592 g

$2550 lbs=2550\times 453.592 g$

Let the number of apples with mass of 2550 lbs be a.

$a\times 250 g=2550\times 453.592 g$

$a=\frac{2550\times 453.592 g}{250 g}=4,626.63$

4,626.63 ≈ 4,626

So, there are 4,626 apples in the truck.

3 0

3 years ago

A 500.0-mL buffer solution is 0.100 M in HNO2 and 0.150 M in KNO2. Determine if each addition would exceed the capacity of the b

likoan [24]

Answer:

no one additions exceed the capacity of the buffer

Explanation:

given

Volume buffer = 500.0 mL = 0.5 L

mol HNO₂ = 0.5 L × 0.100 mol/L = 0.05 mol HNO₂

mol NO₂⁻ = 0.5 L × 0.150 mol/L = 0.075 mol NO₂⁻

solution

we know when any base more than 0.05 (HNO2) than exceed buffer capacity

and when any base more than 0.075 (KNO2) than exceed buffer capacity

when we add 250 mg NaOH (0.250 g)

than molar mass NaOH =40 g/mol

and mol NaOH = 0.250 g ÷ 40g/mol

mol NaOH = 0.00625 mol

0.00625 mol NaOH will be neutralized by 0.00625 mol HNO₂

so it would not exceed the capacity of the buffer.

and

when we add 350 mg KOH (0.350 g)

than molar mass KOH =56.10 g

and mol KOH = 0.350 g ÷ 56.10 g/mol

mol KOH = 0.0062 mol

here also capacity of the buffer will not be exceeded

and

now we add 1.25 g HBr

than molar mass HBr = 80.91 g/mol

and mol HBr = 1.25 g ÷ 80.91 g/mol

mol HBr = 0.015 mol

0.015 mol Hbr will neutralize 0.015 mol NO₂⁻

so the capacity will not be exceeded.

and

we add 1.35 g HI

molar mass HI = 127.91 g/mol

so mol HI = 1.35 g ÷ 127.91 g/mol

mol HI = 0.011 mol

capacity of the buffer will not be exceed

3 0

3 years ago

Which half-reaction correctly represents oxidation?

Leokris [45]

Answer: $Mg\rightarrow Mg^{2+}+2e^-$ represents oxidation.

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Example: $Mg\rightarrow Mg^{2+}+2e^-$

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

Example: $Mg^{2+}+2e^-\rightarrow Mg$

$Mg\rightarrow Mg^{2+}+2e^-$ represents oxidation.

4 0

3 years ago