1. At room temperature, air is usually a (solid, liquid, gas).

Answers

Answer 1

Answer: At room temperature the air is Gas

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14) Describe the Cloud Model.
You need to prepare a solution with a specific concentration of Na+Na+ ions; however, someone used the end of the stock solution of NaClNaCl, and there isn’t any NaClNaCl to be found in the lab. You do, however, have some Na2SO4Na2SO4. Can you substitute the same number of grams of Na2SO4Na2SO4 for the NaClNaCl in a solution? Why or why not?
Be sure to answer all parts. Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam. (a) Given these data, find ΔH o rxn , ΔG o rxn , and ΔS o rxn at 298 K: ΔH o f (kJ/mol) ΔG o f (kJ/mol) S o (J/mol·K) Ethylbenzene, C6H5−CH2CH3 −12.5 119.7 255 Styrene, C6H5−CH=CH2 103.8 202.5 238 ΔH o rxn ΔG o rxn ΔS o rxn kJ kJ J/K (b) At what temperature is the reaction spontaneous? °C (c) What are ΔG o rxn and K at 600.°C? ΔG o rxn K kJ/mol × 10 Enter your answer in scientific notation.
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Assume a gasoline is isooctane, which has a density of 0.692 g/ml. What is the mass of 3.8 gal of the gasoline (1 gal = 3.78 l)?

Answers

Density is the ratio of mass to the volume.

The mathematical expression is given as:

$density=(mass)/(volume)$

Now, density of isooctane = $0.692 g/mL$

Volume = $3.8 gal$

Since, 1 gallon = 3.78 L

So, 3.8 gal = $3.78 L* 3.8$

= $14.364 L$

As, 1 L = 1000 mL

Therefore, $14.364 L$ = $14.364 L* 1000 mL$

Volume in mL = $14364 mL$

Put the values,

$0.692 g/mL=(mass)/(14364 mL)$

$m = 0.692 g/mL* 14364 mL$

= $9939.888 g$

Hence, mass of 3.8 gal of the gasoline is $9939.888 g$ .

Which of the following species is amphoteric? A)HCO32- B) HF O C) NH4+ D) P042-

Answers

Answer:

$HCO_(3)^(-)$

Explanation:

Chemical species which can behave as both acids and bases are known as amphoteric species.

$HCO_(3)^(-)$ can behave as both acid and base.

$HCO_(3)^(-)$ can donate H+:

$HCO_3^(-) \rightarrow CO_3^(2-) + H^+$

$HCO_(3)^(-)$ can accept H+ as well:

$HCO_3^(-) + H^+ \rightarrow H_2CO_3$

HF can only behave as acid, as it can only donate H+.

$HF(aq) \rightarrow H^(+)(aq) + F^(-)(aq)$

$NH_4^(+)$ is a conjugate acid of $NH_3$ .

$PO_4^(2-)$ is a conjugate base.

Final answer:

In chemistry, an amphoteric species can act as both a base and an acid. Among the given options, HCO3- (bicarbonate ion) is amphoteric because it can either donate or accept protons.

Explanation:

Among the provided options, the species that are amphoteric are HCO3- (bicarbonate ion). The term amphoteric refers to substances that can act both as an acid and a base. In other words, they can either donate or accept protons. Let's take HCO3- as an example. This ion can act as a base by accepting H+, forming H2CO3, or it can act as an acid by donating H+, forming CO32-. This dual behavior makes it an amphoteric species.

Learn more about Amphoteric Species here:

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Impulse is ___ momentum. A. only a decrease in
B. a change in
c. not related to
D. only an increase in

Answers

Answer:

option B is correct

Explanation:

impulse is a change in momentum

How many moles of titanium (Ti) atoms are in 85.3 g of Ti?

Answers

Answer:

1.7820210165667731 your welcome :)

Explanation:

. An open manometer is filled with mercury. The mercury level is 12mm higher on the side open to the atmosphere. What is the total pressure of the gas, in kPa, if the atmospheric pressure is 100.8 kPa?

Answers

The total pressure of the gas, in kPa is equal to 102.4 kPa.

Given the following data:

Atmospheric pressure = 100.8 kPa

Pressure (open side) = 12 mm Hg

To determine the total pressure of the gas, in kPa:

First of all, we would convert the value of the pressure in mm Hg to kPa.

Conversion:

760 mm Hg = 101.325 kPa

12 mm Hg = X kPa

Cross-multiplying, we have:

$760X = 12* 101.325\n\n760X = 1,215.9\n\nX=(1215.9)/(760)$

X = 1.60 kPa

Now, we can calculate the total pressure by using this formula:

$Total\;pressure = Atmospheric \;pressure + Pressure (side)\n\nTotal\;pressure = 100.8 + 1.60$

Total pressure = 102.4 kPa

Answer:

102kPa

Explanation:

760mmHg = 101.325 kPa

12mmHg = x

Upon converting from mmHg to kPa we have;

x = ( 12 mm Hg x 101.325 kPa) / 760mmHg

x = 1.599868421 kPa

Total pressure = 100.8 kPa + 1.599868421 kPa

Total pressure = 102kPa

Plants make their own food through a process called ____________.(6th grade science)

Answers

Answer:

Photosynthesis

Explanation:

Question:

Plants make their own food through a process called ____________.(6th grade science)

Answer:

The correct answer to the blank is photosynthesis. Photosynthesis is the process that enables plants to get energy from the sun. Light energy from the sun is converted into chemical energy by chlorophyll. Chlorophyll gives plants their green color.

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