Answer:
Ac
Explanation:
Answer:
The answer is a
Explanation:
Ac
please help me I will give a brainleist
A strong acid is neutralized with a weak base put at equal concentrations what can be said about this reaction? A. it will require a larger quantity of base. B. the ph will need to reach 8.0 to be considered neutral. C. it will require a smaller quantity of base D. the base must first be diluted before it can be used to neutralize the acid
Answer:
A) it will require a larger quantity of base is correct
Explanation:
I got it right in class!
Hope this Helps!! :))
What happens when you combine ammonia and formaldehyde?
Answer:
The mechanism for the formation of hexamethylenetetraamine predicts the formation of aminomethanol from the addition of ammonia to formaldehyde. This molecule subsequently undergoes unimolecular decomposition to form methanimine and water.
Explanation:
Brainliest please?
Who developed a climate classification system in 1918?
Select all that apply.
Which items are properties of acids?
1) soapy
2) sour
3) possible burns
4) sweet
5) sharp
I need this answer fast pls and ty
Answer:
its soap
Explanation:
Answer:
2,3
Explanation:
A chemical reaction that has the general formula of AB->A + B is best classified as a (blank) reaction.
synthesis
polymerization
decomposition
oxidation
replacement
What is the blank?
Answer: Decomposition
Explanation:
Synthesis reaction is a type of chemical reaction in which two reactants combine to give a single product.
Polymerization is a reaction where small units called as monomers joine together to form a large molecule called as polymer.
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B.
Oxidation is a reaction where a substance loses electrons and undergo an increase in oxidation state.
Replacement reaction is a type of chemical reaction in which more reactive element displaces the less reactive element from its salt solution.
the number of Al atoms in 0.25 mol of Al2(SO4)3
Answer:
3.011 × 10²³ atoms of Al
Explanation:
Given data:
Number of moles of Al₂(SO₄)₃ = 0.25 mol
Number of atoms of Al = ?
Solution:
In one mole of Al₂(SO₄)₃ there are 2 moles of Al.
In 0.25 mol × 2 = 0.5 mol
1 mole of any substance contain 6.022 × 10²³ atoms.
In 0.5 moles of Al:
1 mole contain 6.022 × 10²³ atoms.
0.5 mol × 6.022 × 10²³ atoms/ 1 mol
3.011 × 10²³ atoms
The pH of a solution of propanoic acid is measured to be . Calculate the acid dissociation constant of propanoic acid. Round your answer to significant digits.
The given question is incomplete. The complete question is:
The pH of a 0.98 M solution of propanoic acid is measured to be 2.43. Calculate the acid dissociation constant of propanoic acid. Round your answer to two significant digits.
Answer: The acid dissociation constant of propanoic acid is [tex]1.4\times 10^{-5}[/tex]
Explanation:
[tex]CH_3CH_2COOH\rightarrow CH_3CH_2COO^-+H^+[/tex]
cM 0 0
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
So dissociation constant will be:
[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
Give c= 0.98 M and pH = 2.43
[tex]pH=-log[H^+][/tex]
[tex]2.43=-log[c\times \alpha][/tex]
[tex]2.43=-log[0.98\times \alpha][/tex]
[tex]3.72\times 10^{-3}=0.98\times \alpha[/tex]
[tex]\alpha=3.79\times 10^{-3}[/tex]
[tex]K_a=\frac{(0.98\times 3.79\times 10^{-3})^2}{(0.98-0.98\times 3.79\times 10^{-3})}=1.4\times 10^{-5}[/tex]
The acid dissociation constant of propanoic acid is [tex]1.4\times 10^{-5}[/tex]
Chemists use the mole as the unit for the amount of substance. One mole is equal to 6.02 x 10^23 (just like one dozen is equal to 12). A 40.1 g sample of calcium contains approximately 1 mole of calcium atoms. How many calcium atoms are in a 4 kg sample of calcium?
Answer:
[tex]atoms=6.0x10^{25}atoms[/tex]
Explanation:
Hello!
In this case, since we are given 4 kg of a calcium-containing sample, in order to compute the atoms there first need to compute the mass in grams:
[tex]m=4kg*\frac{1000g}{1kg} =4000g[/tex]
Next, via the molar mass and the Avogadro's number, we can compute the atoms as follows:
[tex]atoms=4000g*\frac{1mol}{40.1g}*\frac{6.02x10^{23}atoms}{1mol}\\\\atoms=6.0x10^{25}atoms[/tex]
Best regards!
There are 6.02 * 10²⁵ atoms in 4kg of calcium.
Number of moles, number of particles and molar mas relationshipNumber of particles = number of moles * 6.02 * 10²³Number of moles = mass in g / molar mass in g/molmolar mass of calcium = 40 g/mol
Mass of calcium in g = 4 kg * 1000g/kg
mass of calcium = 4000 g
moles of calcium = 4000/ 40
moles of calcium = 100 moles
1 mole of calcium contains 6.02 * 10²³ atoms100 moles of calcium will contain 6.02 * 10²³ * 100 atoms
100 moles of calcium will contain 6.02 * 10²⁵ atoms
Therefore, there are 6.02 * 10²⁵ atoms in 4kg of calcium.
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Describe how cooling rate affects the size of mineral grains in an
igneous rock.
Answer:
The activity relates to the process of igneous rock formation by the cooling of magma. It can be used to illustrate how the rate at which molten rock cools affects the size of the crystals that form within the solid rock – rapid cooling producing small crystals, slower cooling producing larger ones.
Explanation:
What is the difference between the normal boiling point of water and the temperature at which water might boil?
Answer:
Normal boiling point is a standard boiling point at sea level highet that is 100 c°
but the temperature at which water boils may vary with different factors like increasing pressure in pressure cooker.
And it decreases with increase in height.
Explanation:
The boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it. The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere (760 torr).
Normal boiling point is a standard unit and the highest is 100 c° at sea level but the temperature at which water boils and the temperature may vary with respect to different factors.
what is boiling point ?The boiling point is defined as the temperature at which the liquid vapor pressure is equal to the external pressure surrounding the liquid.
The boiling point of a liquid depend on atmospheric pressure.
When external pressure is reduced, the boiling point will be lowered. For example at sea level the boiling point of water is 100 C but when we go to 6,600 feet the boiling point become 93.4 C
The standard boiling point is defines as the temperature of boiling under 1 bar of pressure.
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The photoelectric effect is the
of
electrons when electromagnetic radiation, such as
light, hits a material.
DONE
Answer:
First Question : EMMISION
Second Question: FREQUENCY
Answer:
A. Emission
B. frequency
Explanation:
correct on edge !
Suppose a chromium atom in the oxidation state formed a complex with one chloride anion and five water molecules. Write the chemical formula of this complex.
Answer:
[CrCl(H₂O)₅]²⁺
Explanation:
Oxidation Number of Chromium = +3
Oxidation Number of Chloride = -1
Oxidation Number of Water molecules = 0
Since the complex contains one chloride atom (Cl), 5 water molecules (H₂O) and one chromium atom (Cr). We have;
CrCl(H₂O)₅
The oxidation number of the mixture is given as;
+3 + (-1) + 5(0) = x
x = + 3 - 1 + 0
x = +2
The chemical formular of the complex is;
[CrCl(H₂O)₅]²⁺
The Law of Conservation of
requires that chemical equations are balance with the
reactant atoms being equal to the product atoms.
Answer:
True.
Explanation:
Hello!
In this case, since the law of conservation of mass and energy states that both mass and energy cannot be neither created nor destroyed, if we want to analyze it in a chemical reaction, it is necessary to realize that the initial reactants are composed by a specific amount of atoms of each element and therefore the products must have that equal amount. For instance, going over the formation of water from hydrogen and oxygen:
[tex]H_2+O_2\rightarrow H_2O[/tex]
We can see hydrogen are equal at both sides whereas oxygen do not; that is why we balance it by putting a coefficient of 2 just before hydrogen and water in order to equal the new 4 atoms of H and 2 atoms of O at each side.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
That is why this statement is true.
What is the energy of light with frequency equal to 4.3 x 10^10 s^-1?
Answer:
[tex]E=2.85\times 10^{-23}\ J[/tex]
Explanation:
Given that,
The frequency of light, [tex]f=4.3\times 10^{10}\ Hz[/tex]
We need to find the energy of light. The formula for the energy is given by :
[tex]E=hf[/tex] Where h is Planck's constant
Putting all the values of h and f, we get :
[tex]E=6.63\times 10^{-34}\times 4.3\times 10^{10}\\\\E=2.85\times 10^{-23}\ J[/tex]
So, the energy of light is [tex]2.85\times 10^{-23}\ J[/tex].
which is an example of how people use nonrenewable energy resources?
A. eating a bananas
B. sailing a boat
C. walking to school
D. driving a car
Answer:
i dont think its walking to school because that doesn't use any resources.
Explanation:
i think its driving a car because we use gasoline for that and for sailing we use the wind. hopefully that helps.
Four levels of an energy pyramid are
represented below.
Which statement about this energy
pyramid is correct?
(1) Organisms in level 4 receive their
energy directly from the Sun.
(2) Organisms in level 2 are carnivores.
(3) Organisms in level 2 receive their
energy from level 3.
(4) Organisms in level 1 are producers.
Answer:
ITS option (1)
Explanation:
why cuz it's the answer,
thanks
Hope it helps.
The order of the bars present in the energy pyramid is based on who feeds on whom. Organisms in level 1 are producers. They are primary producers. The correct option is 4.
What is energy pyramid?The energy pyramid is sometimes referred as an ecological pyramid or trophic pyramid. It is a graphical representation among the various organisms present in an ecosystem. The pyramid is composed of many bars. Each bar has different trophic level.
The energy flows from the bottom of the pyramid where we have producers, then upwards. An energy pyramid is very much useful in quantifying the transfer of energy from one organism to another along a food chain.
The producers and the energy present within them occupy the first level of the energy pyramid. These are photosynthesizing plants. These plants use solar energy to produce their own food.
Thus the correct option is 4.
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Which molecule has a Lewis structure that does not obey the octet rule?
N2O
CS2
PH3
CCL4
NO4
N2O molecule has a Lewis structure that does not obey the octet rule.
What are the features of octet rule?The octet rule is a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell.
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell.
It is based on the observation that the atoms of the main group elements have a tendency to participate in chemical bonding in such a way that each atom of the resulting molecule has eight electrons in the valence shell.
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Balance the equation ___Fe+__O2–>___Fe2O3
Answer:
4 Fe + 3 O2 = 2 Fe2O3
Explanation:
In order to balance the equation, there should be equal number of iron atoms (Fe) and oxygen atoms (O2) in Iron(III) oxide (Fe2O3).
Since there are two atoms of Oxygen in 1 oxygen molecule and 3 atoms of Oxygen in 1 Iron Oxide, the least common multiples of the total oxygen atoms which would equal each other is 6 atoms of Oxygen. This results in 3 molecules of O2 and 2 molecules of Fe2O3.
In order to balance out the amount of iron in iron oxide, you must then calculate the total iron atoms in iron oxide; since there are 2 atoms of Fe in each molecule of Iron Oxide and there is 2 molecules of Fe2O3, the total is 2*2 = 4 atoms of iron, Fe.
In order to get 4 atoms of iron from molecules of Fe, you need 4 molecules of Fe, since each molecule contains 1 Fe.
help please please please please
is energy from the light source conduction convention or radiation
How many grams of sulfur in 4.20 x 1021 atoms of sulfur?
Answer:
look it up
Explanation:
Answer to this question?
Answer:
the third one I believe
Answer:
3rd one is the correct answer
I need help plsss for number 2 you do not have to do it.
Answer:bro hold up
Explanation:
What properties are most useful in determining the identity of a liquid
Answer: Purpose: The purpose of this lab is to determine the identity of an unknown liquid by measuring its density, melting point, boiling point, and solubility in both water and alcohol, and then comparing the results to the values for known substances.
Hope this helps........ Stay safe and have a Merry Christmas!!!!!!!!!! :D
Explanation:
When two species A and B form an electron-pair bond and A does not provide its electrons for bonding, the bond present between A and B must be
Answer:
Ionic
Explanation:
If A does not have electron to bond, it just receives one electron from B.
It can´t be covalent because A don´t have any electrons to bond with B.
Which of these elements could be used in industry to control electron flow?
Select one :
a . sulfur
b . antimony
c . titanium
d. bromine
e. calcium
Answer:
the answer is calcium
Explanation:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option E is correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet. Out of given options, calcium element could be used in industry to control electron flow. Calcium belongs to alkaline earth metals that is group 2 of periodic table.
Therefore, the correct option is option E.
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What is made when a salt is dissolved in water?
O A. A precipitate
O B. A compound
O C. A mixture
O D. A solution
Answer:
D. A solution.
Explanation:
"Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution."
Answer:
solution
Explanation:
What is the pH of a solution with [H⁺] = 2.5 x 10-4 M?
Answer:
[tex]\text{pH}=3.6[/tex]
Explanation:
Given that,
[tex][H^+]=2.5\times 10^{-4}\ M[/tex]
We need to find the pH of a solution with [tex][H^+]=2.5\times 10^{-4}\ M[/tex].
We know that,
[tex]\text{pH}=-\text{log}[H^+]\\\\=-\text{log}[2.5\times 10^{-4}]\\\\=-(-3.6)\\\\=3.6[/tex]
So, the pH of the solution is 3.6.
Suppose 7.05 g of zinc iodide is dissolved in 150. mL of a 0.20M aqueous solution of potassium carbonate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the zinc iodide is dissolved in it. Round your answer to 3 significant digits.
Answer:
[tex]M=0.294M[/tex]
Explanation:
Hello!
In this case, since the molarity of the iodide ion is computed by dividing the moles of iodide ions by the volume of solution in liters (0.150 L), we first need to compute the moles of zinc iodide (ZnI2) by using its molar mass and then using a mole ratio of 1 mol of zinc iodide to 2 mol of iodide ion:
[tex]n_{I^-}=7.05gZnI_2*\frac{1molZnI_2}{319.22 gZnI_2}*\frac{2molI^-}{1molZnI_2}=0.0442molI^-[/tex]
Therefore, the resulting molarity turns out:
[tex]M=\frac{0.0442molI^-}{0.150L} \\\\M=0.294M[/tex]
Best regards!
