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3 years ago

Can someone help with these ones? 50 points. Hope not too blurry

Chemistry

1 answer:

crimeas [40]3 years ago

7 0

1. formula of 2,4 dimethylpentane: C₇H₁₆

combustion reaction: C₇H₁₆ + 11O₂ ---> 7CO₂ + 8H₂O

rest of the answers i attached in a separate paper.

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Calculate the volume of dry co2 produced at body temperature (37 ∘c) and 0.970 atm when 25.5 g of glucose is consumed in this re

katrin2010 [14]

I believe the balanced chemical equation is:

C6H12O6 (aq) + 6O2(g) ------> 6CO2(g) + 6H2O(l)

First calculate the moles of CO2 produced:

moles CO2 = 25.5 g C6H12O6 * (1 mol C6H12O6 / 180.15 g) * (6 mol CO2 / 1 mol C6H12O6)

moles CO2 = 0.8493 mol

Using PV = nRT from the ideal gas law:

V = 0.8493 mol * 0.08205746 L atm / mol K * (37 + 273.15 K) / 0.970 atm

6 0

3 years ago

A student creates a model that displays a cross-section of a metal wire wrapped in plastic insulation. Which statement best desc

artcher [175]

Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

<h3>What is an element?</h3>

An element is a substance or material that cannot be affected by an external substance or cannot be broken down by any reaction.

Metal wire is serving as an element, it should not be easily broken or penetrated as an insulator.

Therefore, Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

Learn more on element here,

brainly.com/question/18096867

7 0

3 years ago

Which of the following represents a chemical change. A water to boiled

horsena [70]

Hello,

Here is your answer:

The proper answer to this question is option D "wood is burned". Its a chemical change because its changing forms wood to ash.

Your answer is D.

If you need anymore help feel free to ask me!

Hope this helps!

7 0

3 years ago

Read 2 more answers

A 255 mL round--bonom flask is weighed and found to have a mass of 114.85 g. A few millimeters of an easily vaporized liquid are

Alex17521 [72]

Answer: Option (d) is the correct answer.

Explanation:

According to the given situation, mass of compound will be calculated as follows.

Mass of compound = mass of flask and condensed vapor - mass of flask

= 115.23 - 114.85

= 0.38 g

Volume (V) = 255 mL = $255 \times 10^{-6} m^{3}$ (as 1 ml = $10^{-6} m^{3}$ )

Pressure (P) = 101325 Pa

Temperature = $100^{o}C$ = (100 + 273) K = 373 K

Now, according to the ideal gas equation, PV = nRT

and, moles of compound n = $\frac{PV}{RT}$

= $\frac{101325 \times 255 \times 10^{-6}}{8.314 \times 373}$

= 0.008332 mol

As, molar mass of compound = $\frac{mass}{\text{no. of moles}}$

= $\frac{0.38}{0.008332}$

= 46 g/mol

Therefore, the compound is $C_{2}H_{5}OH$ (molar mass = 12 x 2 + 5 x 1 + 16 + 1 = 46 g/mol).

Thus, we can conclude that out of the given options the liquid could be $C_{2}H_{5}OH$ .

4 0

3 years ago

If oxygen with an electronegativity of 3.5 were to make a chemical bond with lithium, electronegativity of 1.0, what kind of bon

sergejj [24]

Answer:

Ionic.

Explanation:

Elements with higher electronegativity values are better at attracting electrons in a chemical bond.

A chemical bond is considered "ionic" if the electronegativity difference between the two bonding atoms is greater than $1.8$ .
Otherwise, this chemical bond is considered "covalent".

In this example, the difference between the electronegativity of oxygen and lithium is $3.5 - 1.0 = 2.5$ . Since $2.5 > 1.8$ , the bond between the two elements would likely be ionic.

It is possible to reach the same conclusion based on the fact that lithium is a metal while oxygen is a nonmetal. When metal elements react with non-metal elements, the product is typically an ionic compound- with ionic bonds between the atoms.

6 0

2 years ago