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3 years ago

Systems are classified as human-made or natural. Match each example to the correct type of system.

Chemistry

2 answers:

BabaBlast [244]3 years ago

8 0

Answer:

Explanation:

Natural System:

1. solar system

2. plant root system

3. human digestive system

Human-Made System:

1. telephone system

2. city transit system

3. water purification system

Sidana [21]3 years ago

3 0

Answer: Here is the answere with a picture view for better understanding.

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Which conversion factor do you use first to calculate the number of grams of CO2 produced by the reaction of 50.6 g of CH4 with

zlopas [31]

Answer:

This is the conversion factor, we have to use:

44 g / 1mol

Explanation:

The reaction for the methane combustion is:

CH₄ + 2O₂ → CO₂ + 2H₂O

First of all we use this conversion factor to determine the moles of methane, we used.

50.6 g . 1 mol / 16 g = 3.16 mol

So ratio is 1:1, then 3.16 mol of methane will produce 3.16 moles of CO₂

To calculate the grams of produced dioxide:

3.16 mol . 44 g / 1mol = 139.04 g

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3 years ago

Write the electronic configuration of iron in fecl2 and fecl3

Dovator [93]

Answer:

Electronic configuration of fe is

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Explanation:

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3 years ago

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Help! How do you calculate mean time?

Rina8888 [55]

You would take the time taken in trial 1 plus the time taken in trial 2 plus the time taken in trial 3. then you would take that values and divide it by 3 to get your answer

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3 years ago

Which is an element?

Black_prince [1.1K]

Answer:

Explanation:

An element is something on the periodic table by itself.

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4 years ago

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How many grams of ZnCl2 will be produced from 26.0g of Zn and 42.0g of HCl. Round to three significant figures

makvit [3.9K]

Answer: The mass of zinc chloride produced in the reaction is 54.1 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For zinc:

Given mass of zinc = 26 g

Molar mass of zinc = 65.4 g/mol

Putting values in equation 1, we get:

$\text{Moles of zinc}=\frac{26g}{65.4g/mol}=0.397mol$

For HCl:

Given mass of HCl = 42 g

Molar mass of HCl = 36.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of HCl}=\frac{42g}{36.5g/mol}=1.150mol$

The chemical equation for the reaction of zinc and HCl follows:

$Zn+2HCl\rightarrow ZnCl_2+H_2$

By Stoichiometry of the reaction:

1 mole of zinc reacts with 2 moles of HCl

So, 0.397 moles of zinc will react with = $\frac{2}{1}\times 0.397=0.794mol$ of HCl

As, given amount of HCl is more than the required amount. So, it is considered as an excess reagent.

Thus, zinc metal is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of zinc produces 1 mole of zinc chloride

So, 0.397 moles of zinc will produce = $\frac{1}{1}\times 0.397=0.397moles$ of zinc chloride

Now, calculating the mass of zinc chloride from equation 1, we get:

Molar mass of zinc chloride = 136.3 g/mol

Moles of zinc chloride = 0.397 moles

Putting values in equation 1, we get:

$0.397mol=\frac{\text{Mass of zinc chloride}}{136.3g/mol}\\\\\text{Mass of zinc chloride}=(0.397mol\times 136.3g/mol)=54.1g$

Hence, the mass of zinc chloride produced in the reaction is 54.1 grams

7 0

3 years ago