Answer:
D: Salt in water
Explanation:
If a gas occupies 22.4 L at 0.265 atm, then what will the pressure be in atmospheres if the gas occupies 35.52 L? Assume all other
variables are held constant
A)0.167 atm
B)0.437 atm
C)0.886 atm
D)149 atm
Answer:
The new pressure is 0.167 atm
The correct answer is option A
Explanation:
Step 1: Data given
Volume of the gas = 22.4 L
Pressure of the gas = 0.265 atm
The volume increases to 35.52 L
Step 2: Calculate the new pressure
P1*V1 = P2*V2
⇒with P1 = the initial pressure = 0.265 atm
⇒with V1 = the initial volume = 22.4 L
⇒with P2 = the new pressure = TO BE DETERMINED
⇒with V2 = the increased volume = 35.52 L
0.265 atm * 22.4 L = P2 * 35.52 L
P2 = (0.265 atm * 22.4 L) / 35.52 L
P2 = 0.167 atm
The new pressure is 0.167 atm
The correct answer is option A
An atom of which element has the largest atomic radius?
A)
B
B)
Be
C)
N
D)
Ne
Answer:
B) Be
Explanation:
Across the period (going from left to right of the periodic table), the atomic radius decreases. Beryllium is located further on the left of the periodic table compared to the other elements in the option and thus it has the largest atomic radius.
Explanation of trend:
Across the period, the number of protons and electrons increases in the atom. Electrons are added to the valence shell, hence the electrons added are not able to shield the increased nuclear charge well. (Since shielding effect is most effective when core electrons shield the valence electrons) Therefore, the effective nuclear charge (ENC) increases. As ENC increases, valence electrons are increasingly attracted to the nucleus. They are drawn closer to the nucleus, and so the atomic radius decreases across the period.
What is ENC?
ENC is the net nuclear charge acting on the valence electron (since the valence electron experiences electrostatic forces of attraction by the positively charged protons in the nucleus, and an electron-electron repulsion force by the core electrons)
➣ ENC
= nuclear charge (atomic no.) - shielding constant (no. of core electrons)
See diagram: black arrow represents the shielding effect (also known as electron-electron repulsion), while the orange arrows represent the nuclear charge (electrostatic forces of attraction)
Which organisms can digest cellulose? A. all animals that eat other animals B. most animals, including humans C. all plant-eating animals D. only a few kinds of microorganisms
Answer:
Animals such as termites and herbivores such as cows, koalas, and horses all digest cellulose, but even these animals do not themselves have an enzyme that digests this material. Instead, these animals harbor microbes that can digest cellulose.
(Hope this helps) Sky (I didn't choose the answer for you because I just gave you the most simplest hint to help you choose.)
The organisms that can digest cellulose are all plant-eating animals. That is option C.
What is cellulose?Cellulose can be defined as the type of polysaccharide that is found in the cell of plants and plant products.
They can be digested and broken down by the enzyme cellulase which is seen in plant eating animals.
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What is the molariity of a 50.0 mL aqueous solution containing 10.0 grams of hydrogen peroxide, H2O2?
Answer:
6 mol/L
Explanation:
You should know or have the equation to solve for Molarity which is;
M = n/v (M: Molarity) (n: moles of solute) (v: Liters of solute)
You can start off differently but I would start by converting the mL to L. This is your "v" value.
50.0 mL/ 1000 mL = 0.05 L
Now, you have to convert grams to moles in order to solve for molarity (M).
1.) On the periodic table find the molecular weights of H and O.
H= 1.01 g/mol O= 16.00 g/mol
2.) Multiply them and then add them together to have their combined molecular weights. (You have to multiply by 2 because of their equation; H2O2).
2(1.01) + 2(16.00)= 34.02 g/mol
3.) Now, you're going to use the "picket fence method" or whichever your teacher taught you to convert from grams to moles. This will be your "n" value. (I cannot show it on here without it looking weird, so my sincere apologies.)
10.0 g/ 34.02 g = 0.2939 mol
4.)You are now going to plug in your answers into the equation for Molarity.
M= 0.2939 mol / 0.05 L = 5.878 mol/L
5.) I am sure your professor might be a stickler so for sig figs sake when you multiply or divide use the smallest amount of sig figs you see which is 1. Round 5.878 to 6 mol/L
Sorry this explanation is very long let me know if you need a better more written out explanation.
The _____ of a weak acid is strong.
a. conjugate acid
b. conjugate base
c. acid
d. base
Answer: conjugate base
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
A weak acid has a strong conjugate base whereas a strong acid has a weak conjugate base. Similarly a weak base has a strong conjugate acid whereas a strong base has a weak conjugate acid.
[tex]CH_3COOH+NH_3\rightarrow CH_3COO^-+NH_4^+[/tex]
Acetic acid [tex]CH_3COOH[/tex] is weak acid which has strong conjugate base [tex]CH_3COO^-[/tex]
which is correct? not sure which is right
Answer:
butane
Explanation:
Two friends are arguing about the structure of the universe. Caleb says that the universe is made of many galaxies that are
made of millions of stars and many galaxies that are made of millions of planets. Maria says that he is wrong because
galaxies like the Milky Way are made up of millions of universes with millions of stars.
Which best describes the error(s) that were made in this conversation?
Caleb is incorrect when he says that some galaxies are made of stars and some are made of planets, and Maria is
incorrect when she says that the Milky Way is a galaxy.
Maria is incorrect when she says that galaxies are made up of universes
Caleb is incorrect when he says that some galaxies are made of stars and some are made of planets and Maria is
incorrect when she says that galaxies are made up of universes
Maria is incorrect when she says that the Milky Way is a galaxy
Answer:
i put b but im not that sure
Explanation:
Which is a property of every heterogeneous mixture?
The mixture is made up of at least two different states.
The mixture is made up of something dissolved in a liquid.
The composition of the mixture is the same throughout.
The characteristics of the mixture change within a sample.
Answer:
D.) The characteristics of the mixture change within a sample
Explanation:
Because the guy above me is wrong
Answer:
D.) The characteristics of the mixture change within a sample.
Explanation:
HTH!! Have a good day!!! Don't forget to smile!!!!
How many copper atoms are in 70 grams of copper
A sample of a compound contains 60.0 g C and 5.05 g H. It’s molar mass is 78.12 g/mol. What is the compound’s molecular formula?
Answer:
C6H6
Explanation:
C : 60.0 g*1 mol/12 .01g = 5.00 mol
H: 5.05 g * 1 mol/1.01 g= 5.10 mol
C:H = 5.00 mol : 5.10 mol = 1:1
CH is an empirical formula
Molar mass (12.01 +1.01)=13.02 g/mol
78.12g/mol /13.02 g/mol =6
Molecular formula is the empirical that was taken 6 times (CH)6 = C6H6
Answer:
C. C6H6
Explanation:
For edge
A chemist needs 2.00 liters of hydrochloric acid. How many pints is this?
Answer:
4.22675
Explanation:
Calcium reacts with a polyatomic ion to form a compound with the general formula Ca(X). What would be the most likely formula for the compound formed between potassium and the polyatomic ion X?
A) K X
B) K2X
C) KX2
D) K2X3
E) K3X2
Answer:
B) K2X
Explanation:
In an uncharged compound, the total oxidation state must be zero. The oxidation state of the calcium is +2, thus we get the following formula, where x is the oxidation state of the polyatomic ion X:
[tex]x + 2 = 0 \\ x = 0 - 2 \\ x = - 2[/tex]
Also, it is known that potassium has an oxidation state of +1. Since the new compound also has a total oxidation state equal to zero, we get the following equation, where k is the number of K atoms:
[tex]k \times 1 + ( - 2) = 0 \\ k - 2 = 0 \\ k = - ( - 2) \\ k = 2[/tex]
That's how it is found that the compumd consists of 2 K+ ions and one X ion.
A 170 g sample of an aqueous alcohol solution contains 20.0% alcohol by
mass. What is the mass of solvent present in the solution?
20 g
34g
136 g
170 g
bases have a pH of
a. more than 7
b. less than 7
c. 7
Answer:
Bases are more then 7
acids are less then 7 neutral is 7 and bases are more than
Answer:
A. More than 7
Explanation:
ph scale, bases are to the right
PLEEASE HELP TIMED WILL GIVE BRAINLIEST TO CORRECT ANSWER NLY PLEASEEEE HELPPPP
Answer:
1) 1.15 mol
2) M=0.45
3) 22.5 mL
4) 6.25 mL
Explanation:
1)
550 mL= 0.55 L
M= mol solute/ L solution
mol solute= M * L solution
mol solute= (2.1 M * 0.55 L ) M=1.15 mol solute
2)
155 mL = 0.155 L
80 g -> 1 mol NH4NO3
5.61 g -> x
x= (5.61 g * 1 mol NH4NO3)/80 g x= 0.07 mol NH4NO3
M=(0.07 mol NH4NO3)/0.155 L M=0.45
3) M1V1=M2V2
V1= M2V2/M1
V1= (0.500 M * 0.225 L)/5.00 M V1=0.0225 L =22.5 mL
4) M1V1=M2V2
V1= M2V2/M1
V1= (0.25 M * 0.45 L)/ 18.0 M
V1=6.25 x 10^-3 L = 6.25 mL
Answer:
?
Explanation:
What is the difference between a haploid species and a diploid species?
Answer:
Diploid refers to the number of whole chromosome sets present in every cell of an organism: diploid cells contain entire sets. Haploid organisms, only include one complete chromosome set.
Answer:
Haploid species have only one set of complete chromosomes. Diploid species have two sets of complete chromosomes. Haploid cells are created by meiosis, where the diploid cell will divide in half. Two haploids merge by fertilization. Diploid cells reproduce by mitosis making daughter cells that are exact replicas.
Explanation:
examples of haploid are cells (gamate) sperm and ovate
examples of diploid are skin cells, blood cells
PLEASE HELP I WILL GIVE BRAINLEST! what is life about?
Answer:
To live for God.
Explanation:
We are Gods creation. We are here to live for the Lord, to do love& to help save each other so when time comes we will be forever blessed.
Answer:
life is about life I think
Why do the atoms in a molecule want to be so far apart? (Mention Electron domains/Electrons)
Answer:
Because like chargee repel, two molecules will resist being brought close together.
Explanation:
The shorter the distance is between them, the more energy it takes to push them to get even closer. If the molecules approach each other with sufficient energy, however, they may exchange atoms or even form a bond( chemical reaction)
a. What is the mass in grams of 4.2 mols of FeO2?
According to mole concept, there are 368.928 g mass in 4.2 moles of FeO₂.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles=mass/molar mass
Thus, mass=4.2×87.84=368.928 g.
Thus, there are 368.928 g mass in 4.2 moles of FeO₂.
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An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B)1,244 caloriesC) 134,500 caloriesD) 3,215 calories
Answer:
The correct option is;
D) 3,215 calories
Explanation:
Here we are to convert the units of energy
The given units is in Joules, J, while the required units is in calories, where the calorie is defined as the amount of heat required to raise the temperature of 1 gram of water by 1°C
The conversion formula therefore is 1 calorie = 4.1868 J
Hence, 1 J = 1/4.1868 calories
13,450 J = 13,450 × 1/4.1868 calories = 13,450 /4.1868 calories = 3212.477 calories
∴ 13,450 J ≈ 3,215 calories.
How did Robert Goddard contribute to space exploration?
He was the first person in space.
He was the first person to walk on the moon.
He was the first person to use liquid fuel for rockets.
He designed and built the first space station.
Answer:
He was the first person to use liquid fuel for rockets.
The two products that are formed when a solution of HNO3 and a solution of NaOH react are water and?
NaNO2
NaNO3
NaHNO
NaHNO3
Answer:
NaNO3
Explanation:
Hello,
In this case, the required reaction is an acid-base neutralization reaction which is said to be:
[tex]HNO_3+NaOH\rightarrow NaNO_3+H_2O[/tex]
There, we see that the sodium displaced the hydrogen in the nitric acid to form sodium nitrate a very used salt in the industry, so, as a result of that displacement, water is formed as the secondary neutralization product. For the above mentioned, answer is NaNO3 .
Best regards.
Answer: NaNO3
Explanation:
A salt sodium nitrate (NaNO3) is formed alongside water (H2O) when HNO3 and a solution of NaOH undergoes a neutralization reaction.
HNO3 + NaOH --------> NaNO3 + H2O
What is a conductor
When electrons move easily though objects
When electrons cannot move easily through objects
When electrons are at rest
How do you convert kilometers to grams
By multiplying the mass value by 1000.
Answer:
Hey!
What you have to do is to multiply the amount of mass * i.e. 67.9g * by 1000 * 67,900kg! *
Explanation:
HOPE THIS HELPS!
What is the oxidation state of Fe(s)
The oxidation state is zero for Fe (s)
How could you test each molecule to
determine if it was DNA or RNA?
Answer:
Nucleobases should be checked. RNA contains adenine, guanine, cytosine and uracil instead of thymine, so if we isolate uracil, it means that it is RNA, if not, then is DNA.
What specifically do vaccines contain which cause your body to become
immune to specific pathogens? *
Answer:
I'm not entirely sure, but I've heard that vaccines contain very weak amounts of the virus in order to expose your body to it, so that your body can become immune to it before being exposed to the real thing.
So basically, a flu shot contains a weak version of influenza.
I don't know this for sure, but hopefully this helps!
What element is in group 17 and period 3 of the periodic table?
Answer:
Chlorine is the element located in period 3, group 17 of the periodic table.
Explanation:
Answer: Chlorine
Explanation:
pls help Photosynthesis is used to produce food for plants in the form of glucose. In the process, oxygen is released. As shown in the diagram, plants require water and carbon dioxide (from the air). What else is required for photosynthesis and what role does it play? A) Light is required to provide energy for photosynthesis. B) ATP is required as an energy source for photosynthesis. C) Glucose is required as an energy source for photosynthesis D) Oxygen is required to split water molecules in photosynthesis.
Answer:
A) light is required
Explanation:
ATP, Glucose, and oxygen are created from the process
A boy jumps into a cold swimming pool and his body temperature goes down. His muscles, blood vessels, and nervous system work together to restore his body temperature. These responses allow the body to maintain--- Select one: stress balance work structure
Answer:
balance
Explanation:
