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3 years ago

Can each polyatomic ion be treated as a unit when balancing the chemical equation

1 answer:

3 0

Yes. You can either treat the entire polyatomic ion as a unit or separate the elements in the polyatomic ion. Pay attention the parentheses and subscripts, though. Those can confuse people a lot. I personally find it easier to just treat it as a whole unit.

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Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air

laila [671]

Answer:

sunlight

Explanation:

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3 years ago

What Household item turns electrical energy into radiant energy

luda_lava [24]

Answer:

Lamps and televisions

Explanation:

I think those qualify.

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3 years ago

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solution contains 174 grams of lithium bromide in 360 grams of water, what is the mole fraction of lithium bromide

Luba_88 [7]

Answer:

$\large\boxed{\large\boxed{0.091}}$

Explanation:

The mole fraction of a component in a mixture is the number of moles of the component divided by the total number of moles of all the components, multiplied by 100.

The symbol X is used to represent the mole fraction.

$X_A=\dfrac{\text{number of moles of component A}}{\text{number of moles of all the components}}\times 100$

1. Convert masses in grams to number of moles

Formula:

number of moles = mass in grams / molar mass

a) Lithium bromide

Chemical Formula: LiBr
Molar mass: 86.845 g/mol

$\text{Number of moles}=\dfrac{174g}{86.845g/mol}=2.00mol$

b) Water

Chemical formula: H₂O

Molar mass: 18.015 g/mol

$\text{Number of moles}=\dfrac{360g}{18.015g/mol}=19.98mol\approx 20.0mol$

c) Total number of moles = 2.00 mol + 20.0 mol = 22.0 mol

2. Mole fraction of lithium bromide

$\text{Mole fraction of lithium bromide}=\dfrac{2.00}{22.0}=0.091$

5 0

3 years ago

The gradual increase in earth's surface temperature over time is an example of a data trend. True or False?

SVEN [57.7K]

Global warming refers to the gradual increase in the earth's temperature over time. Global Warming is a controversial topic because some have argued that it is merely a transitory phenomenon and is not supported by scientific evidence.

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4 years ago

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Which functional group does the molecule below have? A. Carbonyl B. Hydroxyl C. Ester D. Amino

ANEK [815]

Answer: A. Carbonyl Group

Explanation:

A carbonyl group, is a functional group made-up of a carbon atom double- bonded to oxygen in organic chemistry. Basic carbonyl groups are ; Aldehydes and Ketones.

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3 years ago