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3 years ago

D. potassium + iodine →

Chemistry

1 answer:

aliina [53]3 years ago

5 0

Answer:

The missing reagents are.

Potassium + Iodine = Potassium iodide

Calcium + oxygen = Calcium oxide

Beryllium + Bromine = Beryllium bromide

Copper + Oxygen = Copper oxide

Explanation:

The balanced equation can be written as:

1.Potassium + Iodine = Potassium iodide

$2K(s)+I_{2}(s)\rightarrow 2KI(s)$

Here K = potassium

I2 = Iodine

KI = potasssium iodide.

2.Calcium + oxygen = Calcium oxide

$2Ca(s)+O_{2}(g)\rightarrow 2CaO(s)$

Ca = calcium

O2 = oxygen

CaO = Calcium Oxide

3.Beryllium + Bromine = Beryllium bromide

$Be(s)+Br_{2}(g)\rightarrow BeBr_{2}(s)$

Here,

Be = beryllium

Br2 = bromine

BeBr2 = Beryllium Bromide

4. Copper + Oxygen = Copper oxide

$2Cu(s)+O_{2}(g)\rightarrow 2CuO(s)$

Cu = Copper

O2 = oxygen

CuO = Copper Oxide

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Which of these is a chemical property of matter?

Hitman42 [59]

Answer:

A. Ability to burn

Explanation:

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2 years ago

The standard free energy change for a reaction in an electrolytic cell is always:_________

sattari [20]

Answer: The standard free energy change for a reaction in an electrolytic cell is always positive.

Explanation:

Electrolytic cells use electric currents to drive a non-spontaneous reaction forward.

Relation of standard free energy change and emf of cell

$\Delta G^o=-nFE^0_{cell}$

where,

$\Delta G^o$ = standard free energy change

n= no of electrons gained or lost

F= faraday's constant

$E^0_{cell}$ = standard emf

$E^0_{cell}$ = standard emf = -ve , for non spontaneous reaction

Thus $\Delta G^o=(-ve)(-ve)=+ve$

Thus standard free energy change for a reaction in an electrolytic cell is always positive.

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3 years ago

Which functional group is found in an ester?

Klio2033 [76]

<h2>QUESTION:- Which functional group is found in an ester?</h2>

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RCOOR'

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4 0

3 years ago

Read 2 more answers

If you have a 150-gram sample of CrO3: • How many moles of CrO3 do you have? • How many oxygen atoms do you have? • How many gra

docker41 [41]

Answer :

(a) The moles of $CrO_3$ is, 1.5 moles.

(b) The number of oxygen atoms are, $27.099\times 10^{23}$

(c) The mass of oxygen is, 72 grams.

Explanation : Given,

Mass of $CrO_3$ = 150 g

Molar mass of $CrO_3$ = 100 g/mole

Molar mass of oxygen = 16 g/mole

(a) First we have to calculate the moles of $CrO_3$ .

$\text{Moles of }CrO_3=\frac{\text{Mass of }CrO_3}{\text{Molar mass of }CrO_3}=\frac{150g}{100g/mole}=1.5moles$

The moles of $CrO_3$ is, 1.5 moles.

(b) Now we have to calculate the number of oxygen atoms.

In $CrO_3$ , there are 1 atom of chromium and 3 atoms of oxygen.

According to the mole concept,

1 mole of $CrO_3$ contains $3\times 6.022\times 10^{23}$ number of oxygen atoms.

So, 1.5 mole of $CrO_3$ contains $1.5\times 3\times 6.022\times 10^{23}=27.099\times 10^{23}$ number of oxygen atoms.

The number of oxygen atoms are, $27.099\times 10^{23}$

(c) Now we have to calculate the mass of oxygen.

As, 1 mole of $CrO_3$ contains 3 moles of oxygen

So, 1.5 mole of $CrO_3$ contains $1.5\times 3=4.5$ moles of oxygen

$\text{Mass of oxygen}=\text{Moles of oxygen}\times \text{Molar mass of oxygen}$

$\text{Mass of oxygen}=(4.5mole)\times (16g/mole)=72g$

The mass of oxygen is, 72 grams.

3 0

3 years ago

Why is time plotted on the x axis and distance on the y axis?

SIZIF [17.4K]

Answer:

Because time is independent of distance, and distance is dependent of time.

Explanation:

Usually, on any graph, the independent variable is plotted on the x-axis and the dependent variable is plotted on the y-axis. Because of this, time, which is independent (time happens regardless of any other factor), is on the x-axis while distance, which is the dependent variable (can only take place in time), is on the y-axis.

6 0

3 years ago