Explanation:
Melting is defined as the physical process where a solid state of a substance converts into its liquid state. No change of chemical composition takes place, just the physical state of water is changing.
[tex]\text{Solid}\rightleftharpoons \text{Liquid}[/tex]
There are given carboxylic acids. The melting point of these acids increases to its second group member which is ethanoic acid due to prevalent hydrogen bonding. To break this bonding, a high amount of heat needs to be applied.
But as we move forward, the melting point decreases sharply as an increase in the number of carbon atoms decreases the hydrogen bonding.
Melting point of Formic Acid = [tex]8.3^oC[/tex]
Melting point of Acetic Acid = [tex]16.6^oC[/tex]
Melting point of Propionic Acid = [tex]-21^oC[/tex]
Which of the following describes the motion of water molecules in ice?
A. They do not move at all.
B. They are vibrating slightly.
C. They move the same as in a liquid.
D. They move faster than in a liquid.
B. They are vibrating slightly
Explanation:
This is because the particles are really close together and they vibrate on the spot.
Hope this is useful
Which of the following would increase the pressure of a gas?
Answer:
What are the answer choices????
Answer:
An increase in the number of gas molecules in the same volume container increases pressure. A decrease in container volume increases gas pressure. An increase in temperature of a gas in a rigid container increases the pressure.
Explanation:
Increasing the temperature would increase the pressure on the system
How many moles are equivalent to 365 g of aluminum chloride? Using the dimensions analysis. Show work
Answer:
≈ 2.74 mol [tex]AlCl_{3}[/tex]
(I rounded to 3 sig figs because the starting amount has 3 sig figs.)
Explanation:
[tex]\frac{365g AlCl_{3}}{1}*\frac{1 mol AlCl_{3}}{133.34g AlCl_{3}} =[/tex] 2.73736313184 mol [tex]AlCl_{3}[/tex] ≈ 2.74 mol [tex]AlCl_{3}[/tex]
Hope this helps!
ch
Heat depends on which factor?
how fast the molecules are vibrating
O how big the molecules are
how close the molecules are together
O none of the above
Answer:
Hello There!!
Explanation:
I believe the answer is how fast the molecules are vibrating.
hope this helps,have a great day!!
~Pinky~
4 NH3 + 7 O2 → 4 NO2 + 6 H2O What is the mole ratio between oxygen and nitrogen dioxide? 7 moles to 6 moles 4 moles to 6 moles 7 moles to 4 moles 4 moles to 4 moles
Answer:
7:4
Explanation:
O2 : NO2
7 : 4
hope this helps :)
Atoms of which pair of elements will form ionic bonds in a compound?
The ideal gas law equation is: PV = nRT
Use the ideal gas law to calculate the moles of gas in a container that has a pressure
of 700kpa, volume of 2L and a temperature of 450K.
Answer:
The answer is the first option 0.37 moles
Explanation:
the ideal gas law is PV = nRT, so in the terms of n,
n = PV/RT (divide both sides by RT to let n stand alone)
given: P = 700 kpa, V = 2L, T = 450 K , R = 8.31
n = (700 * 2) / (8.31 * 450)
= 1400/3739.5
= 0.34
Question: (02.01 MC) Which state of matter does this image represent?
O Solid
O Liquid
O Gas
O Plasma
What type of molecule is shown below?
A. Ether
B. Alcohol
C. Aldehyde
D. Ketone
The given molecule is an aldehyde with the formula HCHO. It is the simplest and primary aldehyde . Hence, option c is correct.
What are aldehydes ?Aldehydes are a class of organic compounds that contain a carbonyl group (a carbon double-bonded to an oxygen) at the end of a carbon chain. The general formula for an aldehyde is RCHO, where R is a substituent or side chain attached to the carbonyl group.
Aldehydes are often characterized by their distinctive odor, which can be described as pungent and irritating. Some common aldehydes include formaldehyde (used in building materials and as a disinfectant), acetaldehyde (found in alcoholic beverages), and benzaldehyde (used in food flavorings).
Aldehydes are important intermediates in many chemical reactions, and they are used in a variety of industrial and laboratory applications. They can be synthesized by the oxidation of primary alcohols or by the partial oxidation of hydrocarbons. The given compound is formaldehyde HCHO.
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What is the equation for the average?
A. Average = (total number of data values) / (sum of all data values)
B. Average = (sum of target data values) / (sum of all data values)
C. Average = (sum of target data values) / (total number of data values)
D. Average = (sum of all data values)/ (total number of data values)
Dacat Selection
The equation for the average, also known as the arithmetic mean, is:
D. Average = (sum of all data values) / (total number of data values)
The average is calculated by adding up all the data values and then dividing the sum by the total number of data values. This equation provides a measure of central tendency that represents the typical value or the "average" value of a set of data.
Option A, (total number of data values) / (sum of all data values), does not represent the correct equation for calculating the average. Dividing the total number of data values by the sum of all data values does not yield the average. This equation would result in a value that is not representative of the data set.
Option B, (sum of target data values) / (sum of all data values), is not the correct equation for calculating the average. This equation suggests finding the average of specific "target" data values rather than considering the entire data set.
Option C, (sum of target data values) / (total number of data values), is also not the correct equation for calculating the average. Similar to option B, this equation suggests finding the average of specific "target" data values rather than considering the entire data set.
Therefore, the correct equation for calculating the average is D. Average = (sum of all data values) / (total number of data values). This equation provides the most accurate representation of the average value of a given data set.
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(02.01 MC) Which state of matter does this model represent?
O Solid
O Liquid
O Gas
O Plasma
Answer:
Hello There!!
Explanation:
I believe the answer is O Gas.
hope this helps,have a great day!!
~Pinky~
Something that can be broken down by living organisms is
a.
biodegradable.
c.
ecological.
b.
economic.
d.
renewable.
Please select the best answer from the choices provided
A
B
C
D
Answer:
hii
needed points
How many grams of Lioh are in 1.7 moles?
Answer:
40.7g
Explanation:
so mass = moles × mr( 6.94+16+1)
=1.7 × 23.94
= 40.698
so 3 S.F = 40.7 g
hope this helps :)
40.*
Which pair of compounds reacts to form a condensation polymer?
A-
CH3COOH and C2H5NH2
B- HCOOH and HOC2H OH
C-HOC6H12OH and HOOCCH.COOH
D- H2NC3H NH2 and HOCH OH
Answer:
C-HOC6H12OH and HOOCCH.COOH
hexane-1,6-diol and propane-1,3-dioic acid
What is used to describe the conditions of a reaction at equilibrium?
O A. A reaction-rate constant
O B. An activation energy
O C. An ideal gas constant
O D. An equilibrium constant
SUBM
Use the periodic table to determine the amount of copper and aluminum nitrate formed in the reaction.
Type the correct answer in the box. Express your answer to the correct number of significant figures.
In the reaction,
moles of Cu and
moles of Al(NO3)3 are formed.
Answer:
23, 51
Explanation:
Edmentum/plato
As per the balanced reaction, 2 moles of aluminum metal and 3 moles of copper nitrate gives 2 moles of aluminum nitrate and 3 moles of copper metal. 10 g of Al and 25g of copper nitrate gives 0.08 moles of aluminum nitrate and 0.13 moles of copper.
What is limiting reactant ?A limiting reactant is the reacting species which is not sufficient in amount to complete the reaction. Hence, the limiting reactant determines the yield of the reaction.
The given reaction is written as:
[tex]\rm 3Cu(NO_{3})_{2} + 2Al \rightarrow 2 Al(NO_{3})_{3} + 3Cu[/tex]
2 moles of Al and 3 moles of copper nitrate gives 2 moles of aluminum nitrate and 3 moles of Cu.
Molar mass of copper nitrate = 187.5 g/mol
atomic mass of aluminum = 27 g/mol
then, number of moles in 10 g of Al = 10 g/27 g/mol = 0.37 moles.
number of moles in 25 g of copper nitrate = 25 g/187.5 g/mol = 0.13 moles.
0.37 moles of Al needs 0.5 moles of copper nitrate to react with. Hence, copper nitrate is the limiting reactant.
3 moles of copper nitrate gives 2 moles of aluminum nitrate. Then 0.13 moles will give 2/3rd of 0.13 i e., 0.08 moles of aluminum nitrate. Similarly 0.13 moles copper nitrate gives 0.13 moles of copper metal.
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Your question is incomplete. But your complete question probably was:
10 g of aluminum metal reacts with 25 g of copper nitrate. Use the periodic table to determine the amount of copper and aluminum nitrate formed in the reaction.
In the reaction,
moles of Cu and
moles of Al(NO3)3 are formed.
30. Which two notations represent atoms that are isotopes of the same
element?
A) 31 Sn and 30°Sn
B) 581 Sn and 13 Sn
C) 3°O and LOF
D) 19 Cl and 18K
Answer: 581 Sn and 13 Sn
Explanation:
581 Sn and 13 Sn are both Sn which are the same element with different masses. Isotopes are same element with different masses and the elements can have different masses because of different number of neurons
What is the percent composition by mass of nitrogen in the compound NH3 (gram-formula mass - 17 g/mol)?
A.18%
B.25%
С.75%
D.82%
The aximuthal quantum number of an orbital is 3. What are the possible values of m?
For a given valye of l(l shell), values of m are from -l to 0 to l, so m could be; -3, -2, -1, 0, +1, +2, +3.
Easyy!
the value of m is equal to 2l+1 so there must beseven values for m.
m can have values from -l through zero to +l so the values are -3, -2, -1, 0, +1, +2 and +3.
Which piece of information do you need to determine whether a hydrocarbon
is saturated or unsaturated?
A. The type of C-C bonds in the molecule
B. The number of C-C bonds in the molecule
C. The type of C-H bonds in the molecule
D. The number of C-H bonds in the molecule
Answer:
A
Explanation:
Saturated means all the carbon atoms has four single bonds around it. These bonds are strong and won't break easily therefore saturated hydrocarbons aren't very reactive
Unsaturated means in one instance the C has a double bond with another carbon. This double bond can be easily broken therefore making unsaturated compounds more reactive than saturated compounds
So saturation deals with the type of bonds the carbon has with other carbon atoms. (The C-C bonds)
help in this please....................
c) because rays contain electrons
Newton’s Second Law of Motion: The Law of 1. __________(Inertia/Acceleration)
The acceleration of an object is 2. _____________ (directly/inversely)
proportional to the magnitude of the net force acting on it, in the
3. _____________ (same/opposite) direction as the net force, and
4. _____________ (directly/inversely) proportional to the
5. _____________ (mass/weight) of the object.
Answer:
acceleration
inversly
opposite
directly
mass
What makes plants the beginning of the food chain?
please answer my question aswell as my last one!
Answer: A
Explanation:
i just took the quiz and it was right!
I need to know the coefficient order
Explanation:
in mathematics use Pascal triangle
can someone answer this please
Answer these two questions, please.
1.Why the melting point and boiling point of [tex]H_{2} O[/tex] are lower than metals?
2.Why the melting point and boiling point of [tex]H_{2} O[/tex] are comparatively higher than other non-metals?
Answer:
neom, sodium bicarbonate
What the larger number in the block of an element in the periodic table
Answer:
f-block
Explanation:
20. Show a correct numerical setup for calculating the molarity of the KOH * (aq) solution. Then state the calculated value of the molarity .
Answer:
[tex]M_b = \frac{0.10M * 9.50mL}{3.80mL}[/tex] ---- The setup
[tex]M_b = 0.25M[/tex] --- The molarity of KOH
Explanation:
Given
I will answer the question with the attached titration data
Required
The set and the value of the molarity of KOH
First, calculate the volume of acid (HCL) used:
[tex]V_a = Final\ Reading - Initial\ Reading[/tex]
[tex]V_a = 25.00mL - 15.50mL[/tex]
[tex]V_a = 9.50mL[/tex]
Calculate the final volume of base (KOH) used:
[tex]V_b = Final\ Reading - Initial\ Reading[/tex]
[tex]V_b = 8.80mL - 5.00mL[/tex]
[tex]V_b = 3.80mL[/tex]
The numerical setup is calculated using::
[tex]M_a * V_a = M_b * V_b[/tex]
Where
[tex]V_a = 9.50mL[/tex]
[tex]V_b = 3.80mL[/tex]
[tex]M_a = 0.10M[/tex] --- the given molarity of HCL
So, we have:
[tex]M_a * V_a = M_b * V_b[/tex]
[tex]0.10M * 9.50mL = M_b * 3.80mL[/tex]
Make Mb the subject
[tex]M_b = \frac{0.10M * 9.50mL}{3.80mL}[/tex] ---- The correct numerical setup
The solution is then calculated as:
[tex]M_b = \frac{0.10M * 9.50mL}{3.80mL}[/tex]
[tex]M_b = \frac{0.10 * 9.50}{3.80}M[/tex]
[tex]M_b = \frac{0.95}{3.80}M[/tex]
[tex]M_b = 0.25M[/tex]
Compound A reacts with alcoholic KOH to yield compound B which on ozonolyzises followed by the reaction with Zn/H2O gives methanal and propanal Compound A is
Answer:
1-chlorobutane
Explanation:
Given that :
-- The compound A is made to react with alcoholic KOH and produce compound B.
-- The compound B on Ozonolysis produces methanol as well as propanol
The compound A should be a haloalkanes as treatment of haloalkanes with the alcoholic KOH, it will give alkene.
[tex]$CH_3CH_2CH_2CH_2Cl+KOH( \text{alcohol}) \rightarrow CH_3CH_2CH=CH_2+KCl+H_2O$[/tex]
So, the compound B should be Butene
Now the ozonolysis of the compound B or butene will give methanol and propanal as shown :
[tex]$CH_3CH_2CH=CH_2 \rightarrow CH_2O+CH_3CH_2CHO$[/tex]
Therefore, the compound A is 1-chlorobutane.
Question 14 of 30
Which of the following elements has 1 valence electron?
The Periodic Table
A. Sodium (Na)
B. Chlorine (CI)
C. Calcium (Ca)
D. Helium (He)
SUBMIT
Answer:
A. Sodium (Na)
Explanation:
The total number of electrons in the outermost principal energy level of an element is called the valence electrons of that element.
Na (11)---→1s2 2s2 2p6 3s1
There 1 electron in the outermost principal energy level of Sodium. So, the number of valence electron of Sodium is 11.
Answer:
Na
Explanation:
I was learning about it recently, that dude's right, it's Sodium