Answer:
Increases
Explanation:
When a catalyst is added to hydrogen peroxide,the rate of decomposition Increases.
In living organisms, hydrogen peroxide is gotten through metabolism and it has to be broken down. This is because it could become toxic if it gets to be concentrated.
We can increase the rate of decomposition reaction through the addition of a catalyst. This breaks it down into hydrogen and water
HOCH2CH2OH(s) is classified as an
hope it's helpful
Explanation:
its is classified as ionic cyrstal
which is of the following is not a cation
Answer:Option (b) is the correct answer.
Explanation:
When a neutral element loses an electron then it acquires a positive charge and it is known as a cation.
For example, when a neutral iron atom loses three electrons then it forms a ion.
On the other hand, when a neutral element gains an electron then it acquires a negative charge and it is known as a anion.
For example, a sulfate ion means ion.
Thus, we can conclude that out of the given options sulfate is not a cation.
Explanation:
Why are stomates important for gas exchange and photosynthesis?
3. How many moles of HCl are present in 3.70 L of a 2.33 M HCl solution?
a. 0.63 mol
c. 1.58 mol
b. 0.28 mol
d. 8.6 mol
Answer:
8.6 mol
Explanation:
number of moles = molar concentration x volume in litre
number of moles = 2.33 M x 3.70 L = 8.6 mol
What is the mass number for an atom of zinc containing 30 protons and 34 neutrons?
Answer:
64
Explanation:
mass number =proton + neutron
=30+34=64
(GIVING BRAINLIEST)Match each of the substances below to the the intermolecular force that are present in the substance.
A.) dispersion forces 1.)CBr2Cl2
B.) dipole dipole Force. 2.)NaCl & H2O
C.) hydrogen bonding. 3.)NH3
D.) Ion Dipole Force. 4.)CH4
Answer:
A4
B1
C3
D2
Explanation:
A4: dispersion forces occur in everything as it is variations in the electron cloud. They are very weak and are the only intermolecular force in a non-polar molecule such as CH4.
B1: Dipole Dipole forces occur between polar molecules. The polarity of the molecule creates a dipole which can attract each other. they are stronger then dispersion forces. CBr2Cl2 is a polar molecule.
C3: hydrogen bonding is a special type of dipole-dipole force and are pretty strong. They can only occur between H-N, H-O, and H-F bonds. NH3 has N-H bonds.
D2: ion dipole forces occur between a polar molecule and ions. They mainly occur when charged species (ions) are in a polar solvent but there are likely less common examples.
I hope this helps. Let me know if anything is unclear.
Identify each described physical separation technique.
A. A solid mixture is heated. One component transitions directly between solid and gas.
B. A liquid is carefully poured out, leaving the solid behind in the container.
C. A solvent is added to dissolve only one mixture component and then the liquids are separated.
D. A solid is caught on paper or a membrane while the liquid passes through.
Answer:
A. A solid mixture is heated. One component transitions directly between solid and gas ---> Sublimation
B. A liquid is carefully poured out, leaving the solid behind in the container ----> Decantation
C. A solvent is added to dissolve only one mixture component and then the liquids are separated ----> solvent extraction
D. A solid is caught on paper or a membrane while the liquid passes through ---> Filtration using filter paper
Explanation:
A. Sublimation is a process of separating solids which sublimes (solids turning directly to gases) from a a mixture of other solids which do not sublime. When the mixture is heated, the solids which sublime are separated and those which do not are left behind. examples of solids which sublime are naphthalene, Iodine crystals, etc.
B. Decantation is the process of carefully pouring out a liquid from a mixture of it with a solid, leaving the solid behind. Example, a mixture of sand and water where water can be easily decanted, leaving the sand behind.
C. In the process of solvent extraction, a mixture of solids which are soluble in different solvent, one of the components is dissolved in a solvent in which it is soluble while the others are not. The solution is then filtered out and the solid is then separated from the solvent by evaporation.
D. In filtration using a filter paper, the solid-liquid mixture is passed through a filter paper which has pores the size through which liquids can pass through but the solid can not. therefore, the solid remains behind on the paper while the liquid passes through.
A is sublimation, B is decantation, C is solvent extraction, and D is filtration.
Separation of mixturesChemical mixtures are separated in different ways.
A mixture in which one of the components can sublime may be separated using sublimation. The sublime-able component transition from solid straight into gas.A mixture of a liquid plus solid can be decanted if the solid is allowed to settle below the liquid. The liquid can then be decanted off.Solvent extraction has to do with the recovery of a component of a liquid mixture. A solvent is poured into the mixture and the component to be recovered dissolves in the solvent. The liquid is then separated.Filtration is used to separate a mixture consisting of soluble and insoluble components. The insoluble component can be filtered off using a filter paper of suitable pore size.More on separation of mixtures can be found here: https://brainly.com/question/863988
How many molecules of H2O are in 8.54 moles of H2O?
hurry !!!!
Answer:
5.14 * 10^24 molecules H2O
Explanation:
8.54 moles of H2O contains 8.54 x 6.022 x 10^23 = 5.14 x 10^24 molecules of H2O.
I really need an answer please help
Answer:
56g the time to convey he must take care of the full stops and then try to combine the two sentences that the time to convey
Which of these is true for the electrons of an atom? Choose
O have a positive charge
O found in the nucleus along with the protons
O found in the space surrounding the nucleus
O are attached to the positive charge of neutrons
What
Answer:
The 3rd one " C " because it surrounds the nucleus it's not known the inside
An electron is found in the space surrounding the nucleus.
What is an electron?An electron is a sub-atomic particle which is found in the extra-nuclear part of an atom. They are found revolving int the shells which surround the nucleus.It carries a negative charge of minus 1 .
They are the elementary particles as they do not have known components or structure. It has a mass which is approximately equal 1/1836 th that of proton.No two electrons can occupy the same quantum state according to the Pauli exclusion principle.
As all elementary particles, it too does possess both particle and wave characteristics. They can collide with each other and cause diffraction . Wave properties of electrons are easier to observe with aid of experiments, because of lower mass and longer de Broglie wavelength.
Learn more about electrons, here:
https://brainly.com/question/2845051
#SPJ2
What happens to the potential energy of an object when it falling from a high place?
Answer:
The higher up an object is the greater its gravitational potential energy. ... As most of this GPE gets changed into kinetic energy, the higher up the object starts from the faster it will be falling when it hits the ground. So a change in gravitational potential energy depends on the height an object moves through.
Someone help me with these questions 15 and 16. You can do 17 if you’d like
Answer:
For question 15, we use cloths, heat-resistant gloves. (From what I know, I am just a 7th grader. Forgive me.)
For question 16, we use bowls to drink soup, metal cans which we use to drink soda from, we use lunch boxes which are insulated or thermos can be used for bringing to school to eat lunch and keeping food warm, we use aluminium foil containers to keep food warm.
For question 17, I think it's related to chart above question 15 and etc, if it isn't then I don't think I may be able to help.
draw the resonance structure of the three possible carbocation intermediate to show how methoxyl (-OCH3) diects bromination toward ortho and para position
Answer:
See explanation and image attached
Explanation:
We know that some substituted benzene reacts faster than benzene towards electrophillic substitution. This is often due to the activation of the benzene ring towards electrophillic substitution by resonance.
-OCH3 directs an incoming electrophile (such as during bromination) to the ortho or para position. This is made possible by resonance (mesomeric) effect as shown in the image attached to this answer.
Image credit: pinterest
state mandeelev's periodic law explain mandeelev's periodic table with its limitation
Answer: Mendeleev's periodic law : The properties of element are a periodic function of the atomic masses . Limitations:-(1)positions of hydrogen is not correctly placed. (2) The positions of isotopes could not be explained . For ex:- cl35 are cl37 are placed in the same group.
Explanation:
Arrange in terms on increasing ionization energy: H, K, Si, O
Answer:
K < Si < O < H
Explanation:
The ionization energy is regarded to be the amount of energy required to remove an electron in an atom from its ground state. The factor that determines the Ionization energy atomic radius. This is because the larger the atomic radius, the smaller the Ionization energy because of the shielding effect or screening effect of the inner shell electrons. Across the period, the ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increased nuclear charge. Also, down the period the ionization energy decreases because of increasing atomic radii and increasing shielding effect or screening effect of the inner shell electrons.
So, the increasing order of Ionization energy of the given elements are:
K < Si < O < H
A salt contains only magnesium and one of the halide ions. A 0.0776-g sample of the salt was dissolved in water, and an excess of sulfuric acid was added to form magnesium sulfate (MgSO4), which was filtered, dried, and weighed. Its mass was found to be 0.150 g. What is the formula of the magnesium halide
Answer:
The formula of the magnesium halide is MgF₂
Explanation:
All halides, X, produce a salt with Mg with the formula:
MgX₂
-There are 2 moles of the halide ion per mole of Mg-
With the mass of the MgSO₄ we can find moles of magnesium sulfate = Moles Mg.
With moles of Mg we can know the moles of the halide -1 mole Mg = 2 moles of Halide-
And we can find the mass of Mg in the 0.0776g sample. Subtracting we can find the mass of the halide and, with the mass and moles of the halide we can find its molecular weight and its identity:
Moles MgSO₄ -Molar mass: 120.366g/mol- = Moles Mg:
0.150g * (1mol / 120.366g) = 1.2462x10⁻³ moles Mg
Moles halide:
1.2462x10⁻³ moles Mg * 2 = 2.4924x10⁻³ moles Halide
Mass Mg -Molar mass: 24.305g/mol:
1.2462x10⁻³ moles Mg * (24.305g / mol) = 0.0303g Mg
Mass halide:
0.0776g - 0.0303g Mg = 0.0473g
Molecular weight of the halide:
0.0473g / 2.4924x10⁻³ moles =
18.98g/mol
This molecular weight is the molecular weight of Fluoride ion, F⁻,
The formula of the magnesium halide is MgF₂Question 4 of 10
Which of the following describes a chemical reaction?
A. Atoms in substances react with each other.
B. Molecules interact without bonds breaking.
C. Substances change shape but not properties.
D. Molecules mix without interacting.
SIR
Answer:
B.
Explanation:
Because one or more substances,the reactants are converted into one or more Different substances,the products. Hope this helps
Explain how to create a Bohr model for the element carbon
Answer:
In order to create a Bohr model for carbon, you must start in the first shell of electrons. The first shell can hold up to 2 of carbons 6 electrons. After filling up the first shell you can move on to the second that can hold up to 8 electrons. The finished Bohr model would have 2 electrons in the first shell and 4 in the second shell.
Explanation:
Answer:
elemnt b
Explanation:
How many ruthenium atoms can you line up across across the tip of a finger that is 3.6 cm in length. A ruthenium atom has an average atomic radius of 178 pm.
Answer:
1.0 × 10⁸ ruthenium atoms
Explanation:
Step 1: Calculate the diameter (d) of an atom of ruthenium
The diameter of an atom is twice its radius.
d = 2 × r = 2 x 178 pm = 356 pm
Step 2: Convert "d" to meters
We will use the conversion factor 1 m = 10¹² pm.
356 pm × 1 m/10¹² pm = 3.56 × 10⁻¹⁰ m
Step 3: Convert the distance of the tip of a finger (D) to meters
We will use the conversion factor 1 m = 10² cm.
3.6 cm × 1 m/10² cm = 0.036 m
Step 4: Calculate the number of atoms of ruthenium required
We will use the following expression.
D/d = 0.036 m/3.56 × 10⁻¹⁰ m = 1.0 × 10⁸
The radius of an atom of gold (Au) is about . (a) Express this distance in nanometers (nm) and in picometers (pm). (b) How many gold atoms would have to be lined up to span 1.0 mm
Answer:
(a) 0.135 nm; 135 pm
(b) 3.70 × 10⁶ Au atoms
Explanation:
The radius of an atom of gold (Au) is about 1.35 A. (a) Express this distance in nanometers (nm) and in picometers (pm). (b) How many gold atoms would have to be lined up to span 1.0 mm.
(a)
Step 1: Convert the radius to meters
We will use the conversion factor 1 m = 10¹⁰ A.
1.35 A × 1 m/10¹⁰ A = 1.35 × 10⁻¹⁰ m
Step 2: Convert the radius from m to nm
We will use the conversion factor 1 m = 10⁹ nm.
1.35 × 10⁻¹⁰ m × 10⁹ nm/1 m = 0.135 nm
Step 3: Convert the radius from m to pm
We will use the conversion factor 1 m = 10¹² pm.
1.35 × 10⁻¹⁰ m × 10¹² pm/1 m = 135 pm
(b)
Step 1: Convert "1.0 mm" to meters
We will use the conversion factor 1 m = 10³ mm.
1.0 mm × 1 m/10³ mm = 1.0 × 10⁻³ m
Step 2: Calculate how many gold atoms would have to be lined up to span 1.0 × 10⁻³ m
We will divide 1.0 × 10⁻³ m by 2 times the radius (diameter) of an atom of gold.
1.0 × 10⁻³ m / (2 × 1.35 × 10⁻¹⁰ m) = 3.70 × 10⁶
Identify the most common reaction conditions for the dehydration of 2,3-dimethyl-2-pentanol. A line-angle structure of 2,3-dimethyl-2-pentanol shows a chain of the following sequence:
a. A line terminus, a segment of three vertices, and a line terminus.
b. A CH3 group is attached to the first (from left to right) and the second vertices.
c. An OH group is attached to the first vertex.
Answer:
1) Acid
2) heat
Explanation:
Dehydration is a type of chemical reaction in which water is removed from an alkanol to yield one or more alkenes.
The reaction normally commences with a protonation of the -OH group by a proton from the acid. Water is always a good leaving group so it quickly departs creating a carbocation. The removal of a proton yields the alkene.
The major product is the one in which there is greater substitution around the C=C double bond.
How many grams of Li3N are produced when 4.7 X 10(23) atoms of lithium react?
Answer:
[tex]m_{Li_3N}=9.06gLi_3N[/tex]
Explanation:
Hello!
In this case, since the reaction between nitrogen and lithium to obtain lithium nitride is:
[tex]6Li+N_2\rightarrow 2Li_3N[/tex]
Starting by that amount of atoms of lithium, we first need to compute the moles of lithium via the Avogadro's number:
[tex]n_{Li}=4.7x10^{23}atoms*\frac{1molLi}{6.022x10^{23}atoms}=0.78molLi[/tex]
Now, by using the 6:2 mole ratio between lithium and lithium nitride and the molar mass of this product (34.83 g/mol), we can compute the required grams as shown below:
[tex]m_{Li_3N}=0.78molLi*\frac{2molLi_3N}{6molLi}*\frac{34.83gLi_3N}{1molLi_3N} \\\\m_{Li_3N}=9.06gLi_3N[/tex]
Best regards!
one number is three times of the other and their arithmetic mean is 10 find them
x = 10, y = 20/6
Further explanationGiven
one number is three times of the other
their arithmetic mean is 10
Required
The numbers
Solution
Suppose the numbers you are looking for are x and y, then :
x = 3y (equation 1)
The arithmetic mean : the average of values
(x+3y)/2=10
x+3y = 20 (equation 2)
Substitute equation 1 into equation 2
3y+3y=20
6y=20
y = 20/6
from equation 1 :
x= 3 x 20/6
x = 60/6
x = 10
7.
How many grams are contained in 3.9 x 1023 sulfur atoms?
atoms → moles
grams
I
Answer: 20.775 g S
Explanation: 3.9x10^23 atoms = 0.648 mol
Atomic mass S = 32.08
S in grams = 20.775
Sodium Phosphate reacts with calcium nitrate according to the following equation:
2 Na3PO4 + 3 Ca(NO3)2 - Ca3(PO4), + 6 NaNO3
-
If 49.33 grams of sodium phosphate reacts, how many grams of Calcium Phosphate is
produced?
Answer:
Mass = 46.52 g
Explanation:
Given data:
Mass of sodium phosphate react = 49.33 g
Mass of calcium phosphate produced = ?
Solution:
Chemical equation:
2Na₃PO₄ + 3Ca(NO₃)₂ → Ca₃(PO₄)₂ + 6NaNO₃
Number of moles of Na₃PO₄:
Number of moles = mass/molar mass
Number of moles = 49.33 g/ 163.94 g/mol
Number of moles = 0.300 mol
now we will compare the moles of Na₃PO₄ and Ca₃(PO₄)₂
Na₃PO₄ : Ca₃(PO₄)₂
2 : 1
0.300 : 1/2×0.300 = 0.15
Mass of Ca₃(PO₄)₂:
Mass = number of moles × molar mass
Mass = 0.15 mol × 310.14 g/mol
Mass = 46.52 g
7. Sodium chloride is produced from its elements through a synthesis reaction. What mass of each reactant would be required to produce 25.0 mol of sodium chloride?
Na + Cl2 → NaCl.
Answer:
Mass of Cl₂ = 887.5 g
Mass of Na = 575 g
Explanation:
Given data;
Number of moles of sodium chloride produced = 25.0 mol
Mass of Na required = ?
Mass of Cl₂ required = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
now we will compare the moles of sodium chloride with both reactant.
NaCl : Na
2 : 2
25.0 : 25.0
NaCl : Cl₂
2 : 1
25.0 : 1/2 ×25.0 = 12.5 mol
Mass of Na:
Mass = number of moles × molar mass
Mass = 25.0 mol × 23 g/mol
Mass = 575 g
Mass of Cl₂:
Mass = number of moles × molar mass
Mass = 12.5 mol × 71 g/mol
Mass = 887.5 g
A car is traveling at 8km per hour for 3 hours. What is the distance? 33 km 22 km 24 km 30 km
Answer:24
Explanation:
A student dissolves 19.g of sucrose C12H22O11 in 425.mL of a solvent with a density of 0.82/gmL. The student notices that the volume of the solvent does not change when the sucrose dissolves in it. Calculate the molarity and molality of the student's solution. Round both of your answers to 2 significant digits.
Answer:
0.13M and 0.16m.
Explanation:
Molarity is defined as the moles of solute present in 1L of solution.
Molality is the moles of solute per kg of solvent.
To solve this problem we need to convert the mass of sucrose to moles using its molar mass and finding the volume in L of the solution and the mass in kg of solvent:
Moles sucrose:
Molar mass:
12C = 12*12.01g/mol = 144.12g/mol
22H = 22*1.005g/mol = 22.11g/mol
11O = 11*16g/mol = 176g/mol
Molar mass of sucrose is 144.12g/mol + 22.11g/mol + 176g/mol = 342.23g/mol
Moles are:
19.0g * (1mol / 342.23g/mol) = 0.0555 moles of sucrose
Liters solution:
425mL * (1L / 1000mL) = 0.425L
kg solvent:
425mL * (0.82g/mol) = 348.5g * (1kg / 1000g) = 0.3485kg
Molarity:
0.0555 moles / 0.425L
0.13MMolality:
0.0555 moles / 0.3485kg
0.16mThe value of A for an atom containing 12 protons, 12 electrons and 16 neutrons is
a. 24
b.4
C. 28
d. 12
e. 16
Answer: A = atomic number = 12
Explanation: A (atomic number) defines the chemical element. It is the numbervof protons or electrons. Neutron numbers may vary, produving isotopes of differing atomic mass. This isotope has atomic mass 28. The atomic number 12 = carbon. C28 does not really exist. If it could be produced it would be radioactive with an almost zero halflife.
What two “groups” are contained in every amino acid?
