PLEASE HELP !!!! This is a models of chemistry question
Answer:
The 2.8 hrs one i think???
hope this helps
Explanation:
How many moles are in 568 grams of Gold?
Which of the following is not a type of thematic map? Help please
Answer:
Option c is the answer....
(CH3CH2)2CHCH(CH3)2 Check all that apply. Check all that apply. alkane alkene alkyne cycloalkane cycloalkene cycloalkyne aromatic hydrocarbon
Answer:
Alkane
Explanation:
Alkane is a class of organic compounds that contain only carbon and hydrogen and the carbon atoms are connected to each other by single bonds.
Now, if we look at the molecule whose condensed structural formula is shown in the question, we will notice that the compound can only contain single bonds. That is, the molecule is a saturated hydrocarbon(alkane).
I have drawn out the full structure of the compound to illustrate this point.
5 What does 2Na2O mean?
Answer:
2 Na2O means two molecules of Sodium oxide.
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which of the following is not found in the tropical rainforest?
a.ilang - ilang b. wild pigs c.ferns d. shark
Answer:
B. Wild Pigs!!!!!!!!
What will be the volume occupied by 100 grams of oxygen gas
at STP?
Answer:70L
Explanation:
The volume occupied by 100g of oxygen gas at STP is 70L.
1 mole of a gas at STP occupies 22.4 L volume.
The same goes for oxygen gas, [tex]O_2[/tex]. 1 mole of [tex]O_2[/tex] occupies 22.4L volume.
Now the molar mass of [tex]O_2[/tex] is = 32g
So the number of moles of [tex]O_2[/tex] in 100g is
n = 100/32
n = 3.125 moles
Volume occupied by 3.125 moles or 100g of [tex]O_2[/tex] is
V = 3.125 × 22.4 L
V = 70 L volume is occupied by 100g of oxygen gas.
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Help me please 18-22
Answer:
-4
Explanation:
What is the meaning of matter?
Answer:
Explanation:
physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
Answer:
Anything that takes up space.
Explanation:
Anything that has both volume and mass.
Which of the following best describes the outcome of the cell division process meoisis?
Select one:
A. Meosis does not occur in reproductive cells.
B. The cells produced at the end of meiosis are genetically identical to the parent cell.
C. The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.
D. Cells only divide once during meiosis.
Answer:
Explanation: The answer is B. Because meiosis process produce genetically different, haploid cells. Also, meiosis basically happen to produce gametes. Gametes is haploid. So, the answer is B
Meiosis is a method for cell division taking place in some organisms. In meiosis the cell the cells produced at the end of meiosis contain half the number of chromosomes as the parent cell. Hence, option C is correct.
What is meiosis?meiosis is biological process by which the cell undergo division to produce genetically identical daughter cells. Other methods of cell divisions include mitosis, binary division, budding etc.
The first stage of meiosis includes pairing homologous chromosomes and they segregate to opposite ends of the meiotic spindle.This phase is known as reduction division where, the number of chromosome reduces to half.
This differentiated chromatids separates out in the second phase and yielding the haploid cells. Hence, in meiosis, the cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.
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what is 1.01 km to mm in scientific notation
Answer:
= 3.456 × 1011
Explanation:
How many atoms of oxygen are on the reactants side of this balanced equation?
2AgNO3 (aq)+ Cu(s) —Cu(NO3)2 (aq)+ 2Ag(s)
12
2
3
6
Answer:
Explanation:
I tried to figure it out but my head wasn’t working sorry
1 This animal has a backbone, nurses its offspring: likes to gnaw, has a bushy tail: climbs trees; has reddish fur on its
back and has white fur on its belly.
Answer: American red squirrel
Explanation:
The American red squirrel is the smallest squirrel. The color of the fur may vary from season to season. The color of the squirrel can also vary depending of the environment in which it lives. In summer the black stripe appears on the sides over the white fur. It has a backbone and like other mammals nurses the offsprings. It has a bushy tail. It is a native of North America. Red fur appear on the back and white on the belly. Strong claws, strong muscles, and compact body are other key features of the squirrel.
How many grams of propane, C3H8, are needed to make 140 grams of water?
Answer:
85.6 g
Explanation:
Step 1: Write the balanced combustion equation
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O
Step 2: Calculate the moles corresponding to 140 g of H₂O
The molar mass of H₂O is 18.02 g/mol.
140 g × 1 mol/18.02 g = 7.77 mol
Step 3: Calculate the moles of C₃H₈ needed to produce 7.77 moles of H₂O
The molar ratio of C₃H₈ to H₂O is 1:4. The moles of C₃H₈ needed are 1/4 × 7.77 mol = 1.94 mol.
Step 4: Calculate the mass corresponding to 1.94 moles of C₃H₈
The molar mass of C₃H₈ is 44.10 g/mol.
1.94 mol × 44.10 g/mol = 85.6 g
When the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: sodium chloride (aq) silver nitrate (aq) silver chloride (s) sodium nitrate (aq)
Answer:
1 on each compound there
Explanation:
A balanced reaction is a reaction that has the same number of atoms in the reactants and products. If this number is not the same, we need to balance it putting some numbers as coefficients behind the compound or element that needs to be balanced, For example:
NH₃ ------> N₂ + H₂
As you can see in this reaction, we have 1 nitrogen and 3 hydrogens in the reactants, and in the side of products we have 2 of each element. This needs to be balanced. To do this we put a number as coeffcient to balance the atoms. In this case, we can put a number 2 behind the NH₃, so the number of atoms of nitrogen becomes 2:
2NH₃ ------> N₂ + H₂
But this 2, changes the number of hydrogens, we now have 6 (cause 2 * 3 = 6), so, let's balance hydrogen on the products to be 6, putting a 3:
2NH₃ ------> N₂ + 3H₂
Now, the reaction is balanced in each side of the reaction.
Applying the same principle to the reaction of this exercise we have the following:
NaCl(aq) + AgNO₃(aq) ---------> AgCl(s) + NaNO₃(aq)
As you can see, we have the same number of atoms on each side:
Na: 1; Cl: 1; Ag: 1; N: 1; O: 3
So we don't need to balance this reaction, with just putting the number 1 or none, is perfectly balanced.
Hope this helps
(a) calculate the %ic of the interatomic bond for the intermetallic compound tial3. (b) on the basis of this result, what type of interatomic bonding would you expect to be found in tial3?
Answer:
See explanation
Explanation:
We know that
%ic of the interatomic bond = [1 - e^-(XA - XB)^2/4] * 100%
Now;
XA = electronegativity of Ti = 1.61
XB = electronegativity of Al = 1.54
Substituting values;
%ic of the interatomic bond = [1 - e^-(1.61 - 1.54)^2/4] * 100%
%ic of the interatomic bond = 0.12%
Given the low %ic of the interatomic bond, the bond is metallic.
The percent ionic character is 0% and the type of interatomic bonding would be metallic.
The percent ionic character can be determined by using the formula,
[tex]1-exp{-0.25(Xa-Xb)^{2} ][/tex]
• In the given equation, Xa and Xb refers to the electronegativities of the elements.
• The intermetallic compound given is TiAl₃.
• Based on the electronegativity table, the electronegativity of Al or Xa is 1.5 and the electronegativity of Ti or Xb is 1.5.
Now putting the values in the above formula we get the % ionic character,
[tex]= 1-exp [-0.25 (Xa -Xb)^{2}]*100%\\\\\\=1-exp [-0.25 (1.5 -1.5)^{2}]*100%\\[/tex]
[tex]= 0 percent[/tex]
Thus, the ionic bond character is 0% and the compound TiAl₃ comprises two metals, it exhibits metallic bonding.
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Please help me I need this really quick
Answer:
Produce CO2 = Both
Produces oxygen = Both
Use CO2 in photosynthesis = Both
Use O2 in cellular respiration = Both
Hope this helps! :)
Please help, it's a task in science and I'm really bad at this subject.
Answer:
1. solid
2. liquid
3. plasma
4. gas
Those are the four parts of matter.
Explanation:
I hope this helps.
What is the formula for Silver (I) chloride?
Answer:
AgCl formula for silver(l) chloride
You are given a sample of an unknown solution and are tasked with determining the density. The solution is miscible with water, so you cannot use a float test. To complete this task, you begin by obtaining a clean dry beaker and measure its mass on a balance (120.3621 g). You then use a pipet to transfer the liquid into the beaker. The initial reading on your pipet is 4.126 mL and after you have dispensed the liquid the pipet reads 6.518 mL. You then obtain the mass of the beaker with the liquid inside (123.0194 g).
_____g/mL
Answer: 1.11 g/mL
Explanation:
Density = mass/vol
mass 123.0194-120.3621g = 2.6574
vol 6.518-4.126 ml = 2.392
The number of atoms is 4g Mg (mass number =24 ?
The number of atoms in Mg wpuld be one atom
Hello,
After doing the Knewton assignments and watching some videos. I really do not understand some basics concepts of Energy. One of the questions is asking: Which of the following objects has more kinetic energy than does potential energy?
a) a compressed spring in a pinball machine just before the ball is launched.
b)a rollercoaster motionless at the top of the track.
c) a yo-yo before it is released
d)the pendulum of a grandfather clock at the lowest point of its arc of motion.
I thought that the answer was b, but the correct answer was c). I did not understand the explanation. It says " Kinetic energy is the energy of motion. Each of the objects above are motionless—with stored potential energy—except for the clock. At the bottom of its arc it will have the greatest kinetic energy, which is then converted to potential energy as it swings back up to one side"
So if someone could explain this better I would so good.
Explain the following statement from the text: “Magnets exert magnetic force as a result of magnetic field.
Answer:
All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction.
Magnets exert magnetic force as a result of magnetic field attraction between opposite poles and magnetic field repulsion between same poles.
What are magnets?Magnets are the substance in which north and south poles present and they show attraction towards the different poles and repulsion towards the same pole.
Due to presence of this poles magnets have their own magnetic field and direction of this field governs from north to south pole. Due to this magnetic field magnets exert magnetic force towards some metals like iron and show attraction.
Hence, due to presence of different poles in a magnet, they exerts magnetic force.
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If you had 4.8 x 10^23 molecules of butane, how many moles would this amount represent? (SHOW ALL WORK FOR BRAINLIEST)
Answer:
The mole is simply a very large number that is used by chemists as a unit of measurement.
Explanation:
The mole is simply a very large number,
6.022
×
10
23
, that has a special property. If I have
6.022
×
10
23
hydrogen atoms, I have a mass of 1 gram of hydrogen atoms . If I have
6.022
×
10
23
H
2
molecules, I have a mass of 2 gram of hydrogen molecules. If I have
6.022
×
10
23
C
atoms, I have (approximately!) 12 grams.
The mole is thus the link between the micro world of atoms and molecules, and the macro world of grams and litres, the which we can easily measure by mass or volume. The masses for a mole of each element are given on the periodic table as the atomic weight. So, if have 12 g of
C
, I know, fairly precisely, how many atoms of carbon I have. Given this quantity, I know how many molecules of
O
2
are required to react with the
C
, which I could measure by mass or by volume.
Oxygen gas, generated by the reaction 2KClO3 (s) 2KCl(s) 3O2 (g) is collected over water at 27°C in a 1.35-L vessel at a total pressure of 1.00 atm. (The vapor pressure of H2O at 27°C is 26.0 torr.) How many moles of KClO3 were consumed in the reaction?
Answer:
[tex]n_{KClO_3}=0.0353molKClO_3[/tex]
Explanation:
Hello!
In this case, according to the experiment, we first realize that the pressure of oxygen is:
[tex]p_{O_2}=1.00atm-26.0/760 atm=0.966atm[/tex]
Next, we compute the moles based off the ideal gas law:
[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{0.966atm*1.35L}{0.08206\frac{atm*L}{mol*K}*300K}=0.0530molO_2[/tex]
Thus, since there is 3:2 mole ratio between oxygen and potassium chlorate, we can compute the consumed moles of the latter as shown below:
[tex]n_{KClO_3}=0.0530molO_2*\frac{2molKClO_3}{3molO_2} \\\\n_{KClO_3}=0.0353molKClO_3[/tex]
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In a graph, what effect would adding a catalyst have on D?
A. It would decrease.
B. It would increase.
C. It would stay the same.
D. You cannot tell from this graph.
Answer:
C. It would stay the same
Explanation:
PLATO answer
Which sequence of coefficients will balance the following equation?
Na (s) + O2 (g) → 2Na20 (s).
Answer:
option c. 4,1,2
Explanation:
No. of atoms of each element in reactant is equal to that of products
this woman is riding a bicycle down a hill at a constant speed and in a straight line.
Which change will increase the speed of the bicycle?
A. Added forces of 30 N up the hill and 20 N down the hill
B. Added forces of 30 N up the hill and 30 N down the hill
C. An added force of 20 N down the hill
D. An added force of 20 N to the side of the hill
Answer:
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Do you think genetic engineering is ethical? Explain why or why not.
Answer:
Yes
Explanation:
One of the top goals of genetic engineering is the improvement of health. Imagine a world without the threat of AIDS or cancer. Those working in the genetics field hope that manipulating the genes of humans will one day enable science to prevent people from contracting these potentially deadly diseases.
helllppp i have a test!!!!
A compound has a molar absorptivity of 40.9 cm ^ - 1 * M ^ - 1 at 293 nm. If a 1.00 cm cuvette is used, and the absorbance found to be 0.111, what is the concentration of the sample ?
Answer:
0.00271 M
Explanation:
To solve this problem we can use the formula:
A = ε * C * lWhere A is the absorbance, ε is the molar absorptivity, C is the molar concentration and l is the optical path length.
We input the data given by the problem:
0.111 = 40.9 cm⁻¹M⁻¹ * C * 1.00 cmAnd solve for C:
C = 0.00271 MThe study of chemicals is called chemistry.
The correct answer is 0.00271 M
To solve this problem the formula is used as follows:-
A = ε * C * l
The data is given as follows:-
A is the absorbance,ε is the molar absorptivity, C is the molar concentration l is the optical path length.
[tex]0.111 = 40.9 * C * 1.00[/tex]
After solving the equation the value of C is as follows:-
[tex]C = 0.00271 M[/tex]
Hence, the correct answer is 0.00271.
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