Answer:
Groups
Explanation:
A "family" on the periodic table is also called a "group".
A "group" or a "family" of elements are elements of the same type on the periodic table, for example, all of the transition metals on the periodic table are a "group" or a "family".
I have a question i know this but what is an Idenpendent Variable and what is an Dependent Variable which one is the cause and effect
Answer:
The independent variable is the cause while the dependent variable is the effect.
Explanation:
Many hydrocarbons exist as structural isomers, which are compounds that have the same molecular formula but different structures. For example, both butane and isobutane have the same molecular formula: C4H10- Calculate the mole percent of isobutane in an equilibrium mixture at 25° C, given that the standard Gibbs energy of formation of butane is -15.9 kJ/mol and that of isobutane is -18.0 kJ/mol. Does your result support the notion that straight-chain hydrocarbons (that is, hydrocarbons in which the C atoms are joined in a line) are less stable than branched-chain hydrocarbons?
Answer:
Explanation:
Butane ⇒ Isobutane
ΔG = RT ln K
ΔG = - 18 + 15.9 = - 2.1 kJ / mol
- 2.1 x 10³ = 8.3 x 298 x lnK
lnK = .85
K = 2.33
[ isobutane ] / [ butane ] = 2.33
isobutane / total mixture = 2.33 / 3.33 = .7
% of isobutane = 70 % .
70% is isobutane and 30 % butane . Since equilibrium is tilted towards isobutane , it is more stable . Butane is straight chain and isobutane is branched chain compound .
how many moles of (NH4)2Fe(SO4)2 are in 94.00 mL of 2.50 M (NH4)2Fe(SO4)2 solution.
Answer:
[tex]n_{solute}=0.235mol[/tex]
Explanation:
Hello.
In this case, we are talking about molarity which is an unit of concentration relating the moles of the solute and the volume of the solution in liters only:
[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]
Since the solute is the (NH4)2Fe(SO4)2 and the volume in liters:
[tex]V=94.00mL*\frac{1L}{1000mL} =0.094L[/tex]
Thus, for the given 2.50-M solution, the moles of solute result:
[tex]n_{solute}=M*V=2.50mol/L*0.094L\\\\n_{solute}=0.235mol[/tex]
Best regards.
How is hotter air different than colder air?
A. Hotter air consists of different molecules than colder air.
B. In hotter air, the molecules are closer together and moving more slowly.
C. In hotter air, the molecules are farther apart and moving more rapidly.
D. Hot air is denser than colder air.
Answer:
C.
Explanation:
The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less.
How is hotter air different than colder air?
Options:- A. Hotter air consists of different molecules than colder air.B. In hotter air, the molecules are closer together and moving more slowly.C. In hotter air, the molecules are farther apart and moving more rapidly.D. Hot air is denser than colder air.Answer:-Option C :- In hotter air, the molecules are farther apart and moving more rapidly.
Explanation :- When temperature rises Kinetic energy of the gases increase when helps them to overcome there interatomic molecules so they move further away from each other Due to increase in Kinetic energy there Velocity ( net ) also increase which helps them to move fast As the particles moves far away there density also decrease as less mass of the gas is present in same volume or we can say same mass as larger volume then the colder one With change in temperature only there energies got changed so we can say hotter and colder air has same molecules is same gas heated or chilledwhat is a compound? Claim
Answer: A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.
Explanation:
A sample of sodium chloride was found to contain 60.66 g of sodium and 39.34 g of chloride. How many
grams of each element would be expected in a 200.0 g sample of sodium chloride?
Answer:
78.68g Na
121.32 Cl
Explanation:
This one is more easy than the wording makes it seem. Since there are 60.66g of sodium (Na) and 39.34g of Chlorine (Cl) it adds up to 100g, so in this case you can just double each amount, and get what each would be in a 200g sample.
What kind of soild often has the highest melting points?
Answer: Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together.
Explanation: Covalent bonds are very strong, so covalent network solids typically have the highest melting points out of all four types of solids.
Answer:
giant covalent solids
Ionic solids also have high melting points, often over 1000 degrees but they can vary. Some are often low enough to melt in the lab with a Bunsen burner:
Identify the independent variable and the dependent variable in each of the following hypothesis
HYPOTHESIS: When testing the effect of different alcohols on the cell membrane of red beet cells, the
damage to the membrane can be measured by the amount of red dye released into the solution.
Answer:
Independent variable: different alcohols
Dependent variable: red dye
HEY I NEED ALL ANSWERS RIGHT NOW IT'S MISSING AND MY TEACHER ARE GRADING THEM NOW YOU WILL BE MARKED BRAINLIEST
Balanced reaction is given by
[tex]\\ \rm\Rrightarrow 2C_4H_10+13O_2\longrightarrow 8O_2+10H_2O[/tex]
On both sides
C=8H=20O=26Hence balanced
Molar mass of butane:-
4(12)+10=58uMoles of Butane:-
100/58=1.7mol#16
2mols of Butane produce 8mol CO_21mol of butane produces 4mol CO_2Moles of CO_2:-
4(1.7)=6.8molMass of CO_2:-
44(6.8)=299.2g#17
2mols of butane need 13mol O_21mol of butane needs 6.5mol O_2Moles of O_2
6.5(1.7)=11.05molMass of O_2
11.05(32)=353.6gCalculate the percentage of sulphur in MgSO4.2H₂O
Answer:
[tex]Molecular \: mass \: of \: MgSO_{4}.2H_{2}O\:, \\ \\ ⇝ 24 + 32 + 16 \times 4 + 2(2 \times 1 + 46) \\ \\ ⇝ 24 + 32 + 64 + 36 \\ \\ ⇝156 \: u[/tex]
[tex]\bold\pink{Percentage \: of \: substance \: in \: compound} \\ \\ \bold\pink{⇝ \frac{mass \: of \: substance}{mass \: of \: compound} \times 100}[/tex]
[tex]\% \: age \: of \: Sulphur \: (S) = \frac{32}{156} \times 100 \\ \\ ⇝0.205 \times 100 \\ \\ \fbox\blue{\:⇝ 20.5\%\:}[/tex]
hope helpful ~
Answer:
20.51%
Explanation:
Mass of S = 32g
Mass of MgSO₄ x 2H₂O = 24 + 32 + 64 + 36 = 56 + 100 = 156
%S = 32/156%S = 8/39%S = 20.51%PLEASE HELP ASAP!!!!! What word is the best description for world population growth over the past 200 years?
Question 1 options:
Experimental
Arithmetic
Logarithmic
Exponential
Answer:
Exponential
Explanation:
Because its the numbers/anything that is becoming more and more rapid.
Helpp me please it’s hard
Answer:
I say A not only because it's a repeat of B but because it also doesn't talk about in which direction the velocity is.
Explanation:
Hope this helped.
A brainliest is always appreciated.
Complete the table to indicate the number of covalent bonds, lone pairs, and valence electrons around each atom in the molecule shown.
The Lewis structure for C H O C l. There is a central carbon atom bonded to a hydrogen atom through a single bond, to a chlorine atom through a single bond, and to an oxygen atom through a double bond. There are two lone pairs of electrons on the oxygen atom and three lone pairs of electrons on the chlorine atom.
Atom Covalent bonds Lone pairs Valence electrons
C
O
Cl
H
Which atoms in the molecule fulfill the octet rule?
H
O
Cl
C
Carbon, Oxygen and Chlorine all have eight valence electrons while hydrogen has two valence electrons.
What is Lewis structure?The term Lewis structure refers to the structure of a molecule in which valence electrons are shown as dots and sometimes a dash is used to show bonding between two atoms.
In the molecule CHOCl, we have the Lewis structure as shown in the image attached to this answer. Carbon, Oxygen and Chlorine all have eight valence electrons while hydrogen has two valence electrons. Therefore, all the atoms in the molecue obey the octet rule.
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Explain how/why you categorized the substances the way you did. What characteristics of the substances helped you predict whether the substance was an acid or base
The presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.
What determine acidic and basic nature of a solution?The use of the pH scale is one way of determining the acidic and basic nature of solution. If the pH of a solution is less than 7, it is considered as acidic and if the pH is 7, the solution is neutral.
While if the pH is greater than 7,the solution is basic so we can conclude that the presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.
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NEED ANSWER ASAP
What is the phase change that happens with a gas goes straight to a solid (skip the liquid stage)? Frost would be a good example in everyday life.
List down all the functional groups that present in Levocabastine molecule.
Answer:
Nitrile, amide, carboxylic acid, phenyl (aka. arene)
**There are so many functional groups, so I may list some you don't know. There may also be some that I am not aware of. However, these are all the ones I can see.**
Explanation:
Nitrile: (bottom-left) N triple bonded to C
Amide: (middle) N single bonded to 3 carbons
Carboxylic Acid: (bottom-right) C-CO2H
Phenyl: (top-right) six carbon ring with alternating double bonds
Short Essay: What does the daily number of the rona virus information tells if about Louisiana’s population?
Answer:
32
Explanation:
A 50.0 mL sample of 0.00200 M AgNO3 is added to 50.0 mL of 0.0100 M NaIO3. What is the equilibrium concentration of Ag in solution
The equilibrium concentration of Ag⁺ in the solution is : 7.5 * 10⁻⁶ M
Given that :
Ksp for AgIO₃ = 3 * 10⁻⁸
Determine the equilibrium concentration of Ag in the solutionFirst step : Calculate the concentration of Ag⁺ and IO⁻₃ in the solution
[ Ag⁺ ] = ( mmol Ag⁺ / mL solution )
= ( 50 * 0.00200 / 100 mL ) = 0.001 M
[ IO⁻₃ ] = ( mmol IO⁻₃ / mL solution )
= ( 50 * 0.0100 / 100 mL ) = 0.005 M
Next determine the Ionic product ( Q )
Q = [ Ag⁺ ] [ IO⁻₃ ]
= 0.001 * 0.005
= 5 * 10⁻⁶
Since the value of Q is > Ksp a precipitate ( IO⁻₃ ) will be formed after the completion of the precipitation reaction
Therefore the concentration of the excess IO⁻₃ = 0.400 mmol / 100 mL
= 0.004 M
Second step : considering the initial and final concentrations
Initial concentrations ( mol/ L ) Final concentrations ( mol/L )
[ Ag⁺ ] = 0 M [ Ag⁺ ] = x
[ IO⁻₃ ] = 0.004 M [ IO⁻₃ ] = 0.004 + x
Final step : Determine the equilibrium concentration of Ag in the solution
Ksp = 3 * 10⁻⁸ = [ Ag⁺ ] [ IO⁻₃ ]
= ( x ) ( 0.004 + x )
Therefore x = 7.5 * 10⁻⁶ ( Equilibrium concentration of Ag in the solution )
Hence we can conclude that The equilibrium concentration of Ag⁺ in the solution is : 7.5 * 10⁻⁶ M
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Which compound has the highest melting point?
Al2(CO3)3
C12H22O11
C8H18
H2O
Answer:
Al2(CO3)3 (A)
Explanation:
i think thats the answer
Aluminum carbonate is indeed a carbonate solution of aluminum that is intended for oral intake. It should be the carbonate salt type of aluminum that's also intended for oral consumption.
It is used to alleviate the symptoms of excess stomach acid in situations like heartburn, acid reflux, acid indigestion, upset stomach, or stomach ulcers.It is a water-insoluble Aluminum source that, when heated, rapidly converts to other Aluminum complexes like oxide.Therefore, the answer is "[tex]\bold{Al_2(CO_3)_3}[/tex] ".
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what is the biggest planet on earth im giving branlest to the firsh 1 who answers and 100 coins
Answer:
Jupiter
Biggest Planets In Our Solar System
Explanation:
hopes this help
Answer:
Explanation:
If the question is truly the biggest planet on earth, then the answer is earth.
But if the question is the biggest planet in the solar system, then it is Jupiter.
A plank measures
45.35 inches. How many
centimeters is this?
Answer:
45.35 converts to: 115.189cm
Explanation:
Explain how the earliest philosophers arrived at the conclusion that "this primary entity
(arche) always persists".
They believing that all things consists of that from which they were originally generated is how they arrived at such conclusion.
What is Arche?This is a Greek word which refers to the origins and beginnings of n object or organism.
The earliest philosophers arrived at the conclusion that "this primary entity(arche) always persists as a result of all things comprising of that which they were originally generated .
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Question 14 of 32
Which of the following pairs of elements will form covalent bonds with each
other?
The Periodic Table
O A. Silicon (Si) and nitrogen (N)
B. Magnesium (Mg) and oxygen (0)
C. Chromium (Cr) and zinc (Zn)
O D. Potassium (K) and bromine (Br)
WHAT IS A GLIZZY MADE OF DOUN TO THE DETAIL PLS
At a maximum, an f-orbital can hold_____ electrons, a d-orbital can hold_____ electrons, a p-orbital can hold ________ electrons and an s-orbital can hold ________ electrons.
How many grams of o2 are needed to produce 45.8 grams of Fe203 in the following
reaction?
4Fe(s) + 302(g)
2Fe2O3(s)
Explanation:
45.8 grams of Fe2O3*(1 mole/159.69 g)= moles of Fe2O3
moles of Fe2O3 *(3 moles of O2/2 moles of Fe2O3)=moles of O2
moles of O2*(32.0g of O2/1mole)= mass of O2
1. Atoms have a positive charge.
True or false
Answer: true
Explanation: An atom does of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. Protons and neutrons have nearly equal masses, but in a way they DO differ in charge.
Density of iron is 7.8 g/cc. How much would 10 cc of iron weigh?
Answer:
The answer is 78 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 10 cc
density = 7.8 g/cc
So we have
mass = 7.8 × 10
We have the final answer as
78 gHope this helps you
4. What are two careers in science?
Answer:
the two careers in science are :
1) Engineer
2)Doctor
Explanation:
If a rock contains 75% lead 206 (Pb206) and 25% uranium 238 (U238), how old is the rock? Explain how you determined the answer. (2 points)
The age of the rock can be calculated from the half life of Uranium - 238. The age of the rock sample is 9 million years.
What is radioactivity?The term radioactivity refers to the sponteanous decay of a material which leads to the production of daughter nuclei. We know that uranium 238 decays to lead 206 with a half life of 4.5 billion years.
Using;
0.693/t1/2 = 2.303/t log(No/N)
t1/2 = half life of uranium 238
t = age of the rock sample
No = initial amount of uranium 238
N = amount of uranium 238 after time t
Now;
0.693/4.5 * 10^9 = 2.303/t log (No/0.25No)
0.693/4.5 * 10^9 = 2.303/t log(1/0.25)
0.693/4.5 * 10^9 =1.387/t
1.54 * 10^-10 = 1.387/t
t = 1.387/1.54 * 10^-10
t = 9 million years
The age of the rock sample is 9 million years.
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