4 liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
To find the amount of 30% acid that must be added to 2 liters of 15% acid to result in a mixture that is 25% acid, we can use the concept of percentage concentration. The percentage concentration is defined as the ratio of the number of moles of solute (in this case acid) to the total number of moles of the solution.
Let's call x the number of liters of 30% acid to be added. Then the final volume of the solution is (2+x) liters.We know that the final concentration of the solution is 25%, so we can write the following equation:
(moles of acid in 2 liters of 15%) + (moles of acid in x liters of 30%) / (2+x) = 0.25
We can now use the percentage concentration to find the number of moles of acid in each volume of acid:
moles of acid in 2 liters of 15% = (2L * 0.15) = 0.3 moles
moles of acid in x liters of 30% = (xL * 0.30) = 0.30x molesWe can now substitute these values in the equation above:
(0.3) + (0.30x) / (2+x) = 0.25
Solving for x we can find the volume of 30% acid that needs to be added to the 2 liters of 15% acid:
0.3 + 0.30x = 0.25(2+x)
0.3 + 0.30x = 0.5 + 0.25x
0.05x = 0.2
x = 4 L. Therefore, 4 liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
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3. Which type of bonding forms due to electrical attractions between oppositely charged
elements?
a. Covalent
b. lonic
c. Metallic
d. Subshell
Answer:
Hello There!!
Explanation:
The answer is b. lonic.
hope this helps,have a great day!!
~Pinky~
will give brainly NEED CHEM HELP
Answer:
X- HCl
Y- NaOH
Z- NaCl
Explanation:
An acid turns blue litmus paper red, exhibits low pH(due to high concentration of hydrogen ions) and also react with magnesium as follows;
2HCl(aq) + Mg(s)-------> MgCl2(aq) + H2(g)
A base turns red litmus paper blue, exhibits a high pH (due to low concentration of hydrogen ions) and does not react with magnesium.
A salt does not react with litmus paper, exhibits a neutral pH of 7 and does not react with magnesium.
A(n) ____________________ has more hydrogen ions than hydroxide ions and has a pH ____________________ 7.
An acidic solution has a pH over 7 and contains more hydrogen ions than hydroxide ions. Any aqueous solution with a pH lower than 7.0 ([H+] more than 1.0 x 10-7M) is said to be acidic.
A acidic solution that uses water as its solvent is said to be aqueous. Acidic solutions are sour in contrast to alkaline solutions, yet it's never a good idea to taste an unidentified solution. Any solution that contains more hydrogen ions per volume of solution than water is an acidic solution; contrasted with acidic solutions are basic or alkaline solutions. Atomic number 1 and the letter H stand for the chemical element hydrogen. The element hydrogen is the lightest.
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. What are two major organs of the excretory system?
Answer:
Kidney and bladder..............
Answer:
Option B
The answer is Kidneys and Bladder
Explanation:
The Excretory Organs
A pair of KidneyA pair of Uterus A Urinary BladderA UrethraBut, Kidneys and Bladder is the major organ in Excretory System
Thus, The answer is Kidneys and Bladder
-TheUnknownScientist
When stomach acid helps to break down food into smaller particles this is
an example of a change.*
O Physical
Chemical
O
Elemental
о
Atomic
Answer:
chemical, is the answer your looking for
Diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are elements that exist as two atoms bound together, usually in the form of a molecule.
What is Diatomic?Diatomic molecules are molecules composed of two atoms, held together by chemical bonds. They are the simplest type of molecule, and are very common in nature. Examples of diatomic molecules include oxygen (O2), nitrogen (N2), hydrogen (H2), chlorine (Cl2), and iodine (I2). Diatomic molecules have a wide range of applications in various industries, such as medicine, chemistry, engineering, and energy.
This differs from other elemental substances because those substances contain only one atom. Diatomic elements are very common in nature and make up a large percentage of the atmosphere. They also have unique properties because of the two atoms being bound together. Diatomic elements are an important part of many everyday processes, from respiration to combustion to corrosion.
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What do the total charges need to add to in order to write an ionic formula?
Answer:
Explanation:
When metal and nonmetal ions form ionic bonds, their total electrical charges must balance each other exactly (as in, add up to zero). In order to write a correct formula, you must know the ion charges of all the atoms involved.
in an experiment a piece of magnesium ribbon was cleaned with steel wool 2.4g of the clean ribbon was placed in a crucible and completely... In an experiment a piece of magnesium ribbon was cleaned with steel wool 2.4g of the clean ribbon was placed in a crucible and completely burnt in oxygen.after cooling the product weighted 4.0g. (a)explain why it was necessary to clean the magnesium ribbon? (b)what observation was made in the crucible after burning? (c)why was there an increase in mass? (d)write the equation for reaction which took place in the crucible? (e)the product in the crucible was shaken with water and filtered.
(a) It was necessary to clean the magnesium ribbon in order to remove any impurities or contaminants that might be present on the surface of the ribbon. These impurities could interfere with the burning process or alter the final products of the reaction.
(b) After burning, it is likely that an ash or residue was observed in the crucible.
(c) The increase in mass may be due to the production of new products during the burning process. These products may include magnesium oxide, which is a white solid, or other compounds formed through the reaction of magnesium with oxygen.
(d) The equation for the reaction that took place in the crucible is:
2Mg + O2 -> 2MgO
(e) When the product in the crucible is shaken with water, it is likely that any soluble products, such as magnesium hydroxide, will dissolve in the water. The remaining solid material can then be filtered out, leaving a solution containing the dissolved products.
The magnesium ribbon was cleaned to remove any impurities that could affect the reaction. After burning magnesium in oxygen, the resulting product is magnesium oxide, and the mass increases because the magnesium combines with the oxygen. The reaction equation is 2Mg + O2 -> 2MgO.
Explanation:(a) It was necessary to clean the magnesium ribbon with steel wool to remove any surface oxidation or impurities that could affect the reaction.
(b) After burning, an observation that could be made in the crucible would be a white ash-like substance, which is magnesium oxide.
(c) There was an increase in mass because when magnesium reacts with oxygen, it gains mass as it combines with the oxygen to form magnesium oxide.
(d) The equation for the reaction is: 2Mg + O2 -> 2MgO
(e) When the product in the crucible was shaken with water and filtered, this procedure would typically be used to isolate the product from any remaining unreacted magnesium or other reaction by-products.
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Biological approaches to treating psychological disorders presume that
(1 Point)
A.the body and the mind are not related.
B.psychotherapy is completely ineffective.
C.there is an underlying physiological reason for disturbed behavior.
D.psychological disorders can never be completely cured.
If 2.65 mol of O2 gas has a volume of 49.0 L at 180 C, what is the pressure of the gas?
Answer:
2.01atm
Explanation:
On a camping trip, Marta roasts a marshmallow in the campfire. The marshmallow grows, and then turns black.
Marta notices that the roasted marshmallow smells and tastes differently than the uncooked marshmallows. What
change has taken place, and how does Marta know?
A
a chemical change because the marshmallow changed in taste, color and smell
B
no change because the marshmallow is not a new substance
с
only a physical change because the marshmallow changed size
D
a chemical change because the marshmallow only changed in pH level
Answer:
the answers for the quiz are;
1: A. appearance, composition
2: C. they link up in different ways
3: A. Shape
4: B. false
5: C. a chunky solid formed from two liquids combining
6: B. honey dissolving in tea
7: C. a red candy dissolves and turns water pink
8: liquid water becoming steam
9: D. A substance has changed chemically
10: A. a chemical change because the marshmallow changed in taste, color and smell
Explanation:
On the roasting of marshmallows, a chemical change takes place which changed their taste, color, and smell. Therefore, option (A) is correct.
What is the chemical change?A chemical change is a type of change in which the molecular composition is altered and a new substance is formed is known as a chemical change.
The changes are irreversible and permanent in chemical change. The mass of the substance is altered by adding or removing it during a chemical change.
During a chemical change, there is an energy difference in the breaking of old bonds and the formation of new bonds.
When marshmallows are roasted, a chemical change takes place. The heat causes a chemical reaction producing water molecules, which evaporate and leave carbon behind.
The marshmallow swells as the moisture inside expands, which causes the marshmallow to swell. when the moisture expands, it forms tiny holes in the marshmallow, which offer the moisture to escape as steam.
Then, the carbon present in sugar burns with the oxygen in the air. The blackened part of the marshmallow is the roasted carbon which changes the marshmallow's color.
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How many molecules are in 10.0 g of aspartame?
There are 0.034 x 1019 = 10¹⁹ moles of molecules in 10 g of aspartame.
Avogadro's constant, 6.022 1023, and the molar mass of the material are used to calculate the number of molecules in a given mass of the substance. Aspartame's molecular formula is C14H18N2O5.
Aspartame has a molecular mass of 294 (12 * 14 + 1 * 18 + 14 * 2) + 16 * 5)
Let's convert the 10 mg mass supplied to aspartame moles as follows:
Amount of moles =
= 0.034 × 10 ⁻⁵ mole
We may convert this number to molecules using Avogadro's constant as follows:
= 0.034 × 10 ⁻⁵ (6.022 × 10²³)
= 0.034 × 10¹⁹
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convert formic acid into methane
You move a 12-newton box 6 meters across the floor. How much work have you done?
The amount of work that has been done would be 72 Joules.
What is work done?The work done by a body can be defined as the amount of energy transferred from one body to another body. In other words, work is the product of force and the distance moved by the force.
This can be expressed mathematically as:
Work = force x distance moved by the force.
In this case:
Force = 12 newton
Distance = 6 meters
Work done = 12 x 6
= 72 NM or 72 Joules
In other words, if I move a 12 Newton box by 6 meters across the floor, the amount of work done would be 72 Joules.
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Which of the following properties of covalent compounds are influenced by ionic character?
a. melting point
b. boiling point
c. viscosity
d. all of the above
The property of the covalent compound that is influenced by ionic character is boiling point. Option B
What is the ionic character?We know that for compounds, the kind of bonds that they have are usually neither here nor there. The bonds would have an ionic character and also a given amount of the covalent character.
We must note that the ionic character of a bond is very important when we discuss intermolecular interactions and they do affect the boiling points of the substances very much.
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A baketball ha a momentum of 6. 0 kg m/ outh and a ma of 0. 15 kg what i the baketball velocity
The basketball velocity is 40 m/s.
What is velocity?A vector quantity with both size and direction is velocity. In respect to time, it is the rate with which a displacement changes. Using the formula velocity = displacement/time, velocity may be computed. It is a way to gauge how quickly something is moving in a certain direction. Acceleration, or the rate at which an object's velocity changes, is closely related with velocity. Being a vector quantity, velocity has both a direction and a magnitude. An object must move at the a constant speed and in the same direction in order to maintain a constant velocity.
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calculate the solubility of AgCN in a solution containing 1.0M H Ksp of AgCN is 2.2e-12 Ka of HCN is 6.2e-10
The solubility of AgCN in a solution containing 1.0M H Ksp of AgCN is 2.2e-12 Ka of HCN is 6.2e-10 is 5.9 x 10^-2M.
Given concentration of H+ (M) = 1.0M
Ksp of AgCN = 2.2e-12
Ka of HCN = 6.2e-10
AgCN ⇋ Ag+ +CN− ................Ksp
CN − + H+ ⇋ HCN................... 1/Ka
AgCN + H+ ⇋ HCN + Ag+ ...................Ksp/Ka = K0
K0 = 2.2e-12/6.2e-10 = 0.0035 = 35 x 10-4
At Equilibrium: AgCN + H+ ⇋ HCN + Ag+
Let the moles of [Ag+] = x
So the number of moles of [HCN] = x
K0 = [Ag+] [HCN] / [H+]
35 x 10-4 = x^2/1
x = 5.9 x 10^-2M
Hence the molar solubility of AgCN in buffer solution is 5.9 x 10^-2M.
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In the star's center, the gas is so energized that it has become a sort of super gas, called plasma. The hot plasma is in constant motion. It expands like hot air inside a balloon and pushes outward from the center. Meanwhile, the crushing weight of the star material continues to press inward. In goes the outer material and out goes the inner. The plasma rolls and churns like a hyper hurricane of heat, light, sound, and motion. —A Black Hole Is NOT a Hole, Carolyn Cinami DeCristofano Which question would be a relevant to ask about this text? Why does the plasma in a star expand? Where can I take a hot-air balloon ride? Will there be a hurricane next week?
Answer:
A
Explanation:
Trust me I take the Quiz
The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the smae negative particles wit the same properties (such as charge and mass) were ejectected.
In the gold foil experiment, alpha particles shot at gold foil bounced in the opposite direction from a gold foil which indicated atoms have a small, dense nucleus.
What is the gold foil experiment?Rutherford’s α-particle scattering or gold foil experiment changed our perception of the atomic structure of an atom. Rutherford bombarded beams of α-particles at thin gold foil and observed how the α-particles scattered from the gold foil.
Rutherford showed that the atom has the most empty space with the nucleus at the center and electrons rotating around the atomic nucleus. Highly charged α-particles passed straight undeflected through the foil. This will be the expected result if the plum pudding model of Thomson was correct.
A few charged alpha particles were deflected backward direction leading to the positive charge concentrated in a small space.
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In the reaction
2 NO(g) + O2(g) → 2 NO2(g)
when the NO concentration alone was doubled, the rate increased by a factor of 4; when both the NO and O2 concentrations were in-
creased by a factor of 2, the rate increased by a factor of 8. What is the rate law for the reaction?
Answer:
rate = [NO]²[O2]
Explanation:
The rate law for the reaction:
2 NO(g) + O2(g) → 2 NO2(g)
Is expressed in terms of reactants as follows:
rate = [NO]ⁿ[O2]ˣ
Where n and x are the coefficients of the rate law.
If [NO] is doubled, the rate increased 4 times. That is only possible if:
rate = [NO]²[O2]ˣ
Now, as [NO] is doubled and increased the rate 4 times, and [NO] + [O2] when doubled increased the rate 8 times, doubled [O2] implies increased the rate 2 times. That is only possible is:
rate = [NO]²[O2]Why and how does atom change during time
Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. So, adding or removing protons from the nucleus changes what element that atom is
What happens to the reactivity as you move from left to right?
The reactivity of the element in the periodic table as me move from the left to right in the period it will decreases first and then it will increases.
In the periodic table , for the metals the reactivity of the decreases as we move across the period from left to the right. in the group it will increases as we move from the top to bottom.
In the periodic table for the non metals, the reactivity will increases as we move from left to the right in a period. in the group it will decreases as we move from top to the bottom.
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One mole of methane (CH4) and one mole of oxygen (O 2) would have the same number of atoms. Question 9 options: True False
This statement is false.
One mole of methane (CH4) contains one atom of carbon and four atoms of hydrogen, for a total of five atoms. On the other hand, one mole of oxygen (O2) contains two atoms of oxygen, for a total of two atoms. Therefore, one mole of methane and one mole of oxygen do not have the same number of atoms.
It's important to note that a mole is a unit of measurement that corresponds to the Avogadro's number of atoms, ions or molecules of a substance, which is 6.022 x 10^23 atoms, ions or molecules. That means that one mole of a substance has the same number of atoms, ions or molecules but not always the same number of elements.
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7.92g of FeSO4 • 6H2O is equal to how many molecules?
7.92g of FeSO4 • 6H2O is equal to 1.55 x 10^23 molecules.
What is molecules?Molecules are the smallest units of matter that can exist by themselves. They are composed of two or more atoms that are held together by chemical bonds. Molecules can be found in the air we breathe, the water we drink, and the food we eat. They can also be found in living organisms, like plants and animals. Molecules can be made of a variety of different atoms, such as oxygen, carbon, nitrogen, and hydrogen. They also come in different shapes and sizes, depending on the types of atoms they are composed of.
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The poles of an electromagnet can even be reversed by reversing the flow of electricity true or false
By reversing the flow of electricity, the poles of an electromagnet may be reversed. As a result, the following statement is true.
An electromagnet is a magnet that uses electricity to operate. In contrast to a permanent magnet, the strength of an electromagnet may be readily altered by varying the amount of electric current flowing through it. By reversing the flow of electricity, the poles of an electromagnet can even be reversed.
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What are the correct formal charges for nitrogen atoms I, II, and III, respectively, in the azide below
Formal charge for nitrogen atoms I, II, and III, respectively in the azide provided is 0, +1, and -1
A formal charge, in the covalent chemical bonding, refers to the hypothetical charge assigned to an atom in a molecule, based on the assumption that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity. In other words, formal charge is defined as the difference between the number of valence electrons of an atom in a neutral free state and the number assigned to that atom in a Lewis structure. It is given as
Formal charges = Group variance – nonbonding electrons – ½ bonding electron
For the nitrogen atom I,
Formal charges =5 – 2 – ½ (6) = 0
For the nitrogen atom II,
Formal charges =5 – 0 – ½ (8) = 1
For the nitrogen atom III,
Formal charges =5 – 4 – ½ (4) = -1
Note: The question is incomplete as it is missing the figure which is attached.
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What is the variable in an experiment?
A the glass tubes you use
B the questions you ask
C the thing you want to test
D the part that stays the same
which of the following molecules has the most polar bond between the bonded atoms in terms of greatest and hf hcl hbr hl
HCl is the most polar due to the high electronegativity of Cl.
Hydrogen chloride is a diatomic molecule, composed of a hydrogen atom, H, and a chlorine atom, Cl, joined by a polar covalent bond. The bond is a polar covalent bond because the chlorine atom is much more electronegative than the hydrogen atom.
Positively charged protons in the nucleus attract negatively charged electrons. As the number of protons in the nucleus increases, the electronegativity, or attractive force, increases. Therefore, electronegativity increases in a row from left to right on the periodic table.
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The movement of tectonic plates is so slow and gradual that you cannot see or feel them moving. As a result, scientist depend on the global positioning system (GPS) to verify tectonic plate motion. Satellites can measure the small distances that GPS ground stations move over time. In what units is the movement of tectonic plates measured? Group of answer choices.
Answer:
centimeters per year
Explanation:
how to balance
_k+_H2O ➡️ KOH + _H2
Answer:
2K + 2H2O ---> 2KOH + H2
Explanation:
Answer:
2k+2H2O ➡️2KOH + H2.....