Answer:
Sodium hydroxide solution.
Explanation:
because it is a strong base. Since carbonic acid is a weak acid, a solution formed resists change in pH on addition hence buffer formed.
Sodium hydroxide solution can be can be mixed in solution with H2CO3 to make a buffer.
What is buffer?A buffer would be a solution that could withstand pH changes when acidic as well as basic components are added.
What is solution ?The term "solution" was most frequently associated with the liquid form of matter, however gases as well as solids can also form solutions.
A traditional buffer is made up of a weak acid including its conjugate salts, such as carbonic acid (H2CO3) as well as sodium bicarbonate (NaHCO3) or sodium bicarbonate with calcium carbonate.
Sodium hydroxide solution can be can be mixed in solution with H2CO3 to make a buffer.
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3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
A fungicide was used to kill the mushrooms in a
lawn. Some mushrooms were not affected by the
fungicide. The resistant mushrooms reproduced.
The resistance of some of the mushrooms to the
fungicide was
Answer: a
Explanation:
Give the definition for diffusion. Group of answer choices gas molecules mix equally average distance between collisions gas molecules escape from a container into a vacuum through a small hole gas molecules mix unequally gas molecules spread out in response to a concentration gradient Next
Answer:
gas molecules spread out in response to a concentration gradient.
Explanation:
Diffusion can be defined as the movement of gas molecules from a region of high concentration to a region of lower concentration until an equilibrium is attained or reached. This mixing of gas molecules in the liquid or gaseous state is due to their kinetic energy of random motion i.e without requiring bulk motion.
This ultimately implies that, diffusion is a phenomenon through which gas molecules in either a gaseous or liquid state spread out in response to a concentration gradient, which is simply the difference in concentration of the gases across a space.
In conclusion, increasing the surface area of a gas increases its collision rate and it's considered to be an evolutionary strategy that maximizes the diffusion of gas molecules by catalysing the rate of a gaseous reaction.
How many liters of water would you need to add to 4.36 moles of NaCl to create a 9.4 M solution?
Answer:
0.464 L
Explanation:
Molarity (M) = number moles (n) ÷ volume (V)
According to the information given in this question:
number of moles (n) = 4.36 moles
Molarity = 9.4M
Volume = ?
Using M = n/V
9.4 = 4.36/V
9.4V = 4.36
V = 4.36/9.4
V = 0.464 L
Hence, 0.464L of water are needed the volume of water.
The formation of ClF3(g) is exothermic: Cl2(g) 3 F2(g) 2 ClF3(g) heatPredict the effect on the equilibrium decreasing the volume of the flask containing the reaction. Answer by choosing:
Answer:
See explanation
Explanation:
The reaction equation is;
Cl2(g) + 3 F2(g) ------>2 ClF3(g)
If the volume of the flask containing the reactants in this exothermic reaction is decreased, the equilibrium position will shift towards the right hand side.
This is because, decrease in the volume of the reaction system drives the equilibrium in the direction producing the lower total volume which in this case is the forward direction
Hence when the volume of the reaction system is decreased, more ClF3 is obtained because the equilibrium position shifts towards the right hand side.
A bond that occurs between metals and nonmetals is called a/an:
Answer:
Ionic Bond
Explanation:
The bond between metals and non-metals is an ionic bond. This is due to the large difference in electronegativity between the non-metal and metal. Metals give up electrons easily, so they will have lower electronegativities. Non-metals can easily gain electrons, so they have high electronegativities. If you look at valence electrons, they will extensively/exclusively surround the non-metal.
A bond that occurs between metals and non-metals is called an [tex]\sf\purple{ionic\: bond}[/tex].
Explanation:-
Ionic bonds usually involves the transfer of electrons from a metal atom to a non-metal atom.
The metals lose electrons and form cations while the non-metals accept the lost electrons and form anions.
[tex]\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{❦}}}}}[/tex]
One atom of chromium (Cr) has a mass of 52.00 amu. How many chromium atoms does it take to equal a mass of 52.00 g?
1 chromium atom
Explanation:
number of (Cr) atom =
[tex] \frac{mass \: of \: cr}{molar \: mass \: (amu)} [/tex]
n = m/M
n = 52/52
n= 1g
A 59.0 mL portion of a 1.80 M solution is diluted to a total volume of 258 mL. A 129 mL portion of that solution is diluted by adding 183 mL of water. What is the final concentration
Answer:
0.170 M
Explanation:
As this is a series of dilutions, we can continuosly use the C₁V₁=C₂V₂ formula to solve this problem:
For the first step:
59.0 mL * 1.80 M = 258 mL * C₂C₂ = 0.412 MThen for when 129 mL of that 0.412 M are diluted by adding 183 mL of water:
V₂ = 129 mL + 183 mL = 312 mLUsing C₁V₁=C₂V₂:
129 mL * 0.412 M = 312 mL * C₂C₂ = 0.170 MOnce formed, how many valence electrons does an anion hold?
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
Using dimensional analysis convert 238.0 cm3 to L
Answer:
= 0.238 L
Explanation:
From the given information:
To convert cm³ to L(liter), we utilize the advent of a unit fraction that comprises a liter in the upper part of the fraction(numerator) and a cubic centimeter in the lower part of the fraction(denominator)
Recall that:
1000 cm³ = 1 liter
∴
238.0 cm³ = [tex]\dfrac{238.0 \ cm^3}{1} \times \dfrac{1 \ L}{1000 \ cm^3}[/tex]
= 0.238 L
Question 3 (4 points)
The concentration of hydroxide ions in a solution that has a poH of 6.0 is
a
10-6 M.
Ob
106 M.
Ос
101 M.
Od
10-8 M.
Answer:
a. 1.0 × 10⁻⁶ M (≈ 10⁻⁶ M)
Explanation:
Step 1: Given data
pOH of the solution: 6.0
Step 2: Calculate the concentration of hydroxide ions ([OH⁻]) in the solution
We will use the definition of pOH.
pOH = -log [OH⁻]
[OH⁻] = antilog -pOH
[OH⁻] = antilog -6.0
[OH⁻] = 1.0 × 10⁻⁶ M
Since [OH⁻] > 10⁻⁷ M, we can conclude that the solution is basic.
Identify The compound with the highest vapor pressure
Answer:
I think the answer will be A
Answer:
ch3och3
Explanation:
Calculate the pH of a buffer solution prepared by mixing 75.0 mL of 1.25 M lactic acid and 40.0 mL of 0.75 M sodium lactate. (The pKa for lactic acid is 3.86. The molar mass for lactic acid is 90.1 g/mol and the molar mass for sodium lactate is 112.1 g/mol.)
Answer:
pH = 3.37
Explanation:
A weak acid as lactic acid in a solution with sodium lactate (Its conjugate base) produce a buffer. The pH of this buffer is obtained using H-H equation:
pH = pKa + log [A-] / [HA]
Where pH is the pH of the buffer,
pKa is 3.86
And [] could be taken as the moles of A- = Sodium lactate and HA = Lactic acid.
Moles A-:
40.0mL = 0.0400L * (0.75mol / L) = 0.030 moles A-
Moles HA:
75.0mL = 0.0750L * (1.25mol / L) = 0.09375 moles HA
Replacing:
pH = 3.86+ log [0.030 moles A-] / [0.09375 moles HA]
pH = 3.37
Density is an example of a
A concentrated salt solution has a mass of 5.29 g for a 5.00 mL sample. What is the specific gravity of this solution
Answer:
[tex]\rho_s=1.07g/cc^3[/tex]
Explanation:
From the question we are told that:
Mass [tex]M=5.29g[/tex]
Volume [tex]V=5.00mL=>5.0cc^3[/tex]
Generally the equation for Specific Gravity momentum is mathematically given by
[tex]Specific\ Gravity\ g= Density\ of\ Salt\ Solution\ \rho_s / Density\ of\ Water\ \rho_w[/tex]
[tex]g=\frac{ \rho_s} { \rho_w}[/tex]
[tex]\rho_s=\frac{ g} { \rho_w}[/tex]
[tex]\rho_s=\frac{ 5.29} { 5}[/tex]
[tex]\rho_s=1.07g/cc^3[/tex]
The specific gravity of this solution is = 1.06.
Specific gravity of a solution:The specific gravity of a solution is the mass of a unit volume of a substance to the mass of a unit volume of a given reference material.
Therefore specific gravity of the solution can be calculated as follows:
[tex]sg = \frac{density. of . substance}{density . of . water} [/tex]
But, density of substance (salt): mass/volume
mass = 5.29g
volume = 5.00mL
Therefore density = 5.29/5
= 1.06g/ml
But density of water is = 1 g/ ml
Therefore, specific gravity = 1.06/1
= 1.06
The specific gravity of a solution is 1.06.
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How many atoms are present in 44.89 moles of Be?
Answer:
I hope that helps. I did not round the answer at the end. Maybe you want the final answer in a specific decimal place.
ASAP
A chemical equilibrium between gaseous reactants and products is shown.
N2(g) + 3H2(g) ⇌ 2NH3(g)
How will the reaction be affected if the pressure on the system is increased?
It will shift toward the reactant side as there is lower pressure on the reactant side.
It will shift toward the product side as there is higher pressure on the product side.
It will shift toward the reactant side as there are a greater number of moles of gas on the reactant side.
It will shift toward the product side as there are a fewer number of moles of gas on the product side
The chemical equilibrium is the state at which the rate of reaction is constant. The increase in pressure shifts the reaction towards the product side, as fewer moles of the product are there.
What are the factors affecting the chemical equilibrium?The chemical equilibrium is shifters with the change in the concentration, temperature, pressure, and volume of the reaction.
The increase in the pressure results in more contact between the reactant molecules, as they are more in number and moles in the reaction.
The increased collision of the reactant molecules tried to reach the equilibrium condition, and the increased formation of the product is observed.
Thus, the increase in the pressure shifts the chemical equilibrium towards the product, as there were few moles of the product in the reaction.
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Answer:
its C
Explanation:
just took the test
Classify each of the following elements as a metal, nonmetal, or metalloid.
Na, Ge, Si, Br, Ag
Metal
Nonmetal
Metalloid
Multiple Choice
Which statement is not part of Dalton's atomic theory?
All atoms of a given element have the same mass and other properties.
Certain groups of elements have similar properties.
Each element is composed of indestructible particles called atoms.
Atoms combine in simple whole-number ratios to form compounds.
Which of the following statements is true about the properties of protons, neutrons, and electrons?
One positive charge cancels (neutralizes) another positive charge.
One negative charge cancels (neutralizes) another negative charge.
Positive and negative charges attract.
Protons have much less mass than neutrons and electrons.
ig i i i i i i i i i ii i i i i i ii i i i i i
1. Na is metal
Ge is Metalloid
Si is Metalloid
Br is Nonmetal
Ag is Metal
2. Each element is composed of indestructible particles called atoms.
3. Positive and negative charges attract.
What is Chemistry?Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.
In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. primary chemical bonds—e.g., covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); metallic bonds—and 2. secondary chemical bonds—e.g., hydrogen bonds; Van der Waals force bonds; ion-ion interaction; ion-dipole interaction.
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How many moles are in 153.00 grams of KCL3?
Explanation:
you have to use the formula
number of moles=mass/molar mass
=153/145.5
=1.05g/mol
I hope this helps
How many grams of 02 are present in 7.49 L of oxygen gas?
Answer:
10.70grams
Explanation:
Density of a substance = mass/volume
At STP of a gas (standard temperature and pressure), the density of oxygen gas is 1.429 g/L
Hence, according to this question, in 7.49 L of oxygen gas, there would be:
Using D = m/V
1.429 = m/7.49
m = 1.429g/L × 7.49L
m = 10.70g
(BRAINLIEST AWARD!! LAST QUESTION!!) Jean-Baptiste Lamarck's theory of evolution stated that an organism could pass on to its offspring all characteristics it had acquired in its lifetime. Which of these statements best explains why this theory is considered invalid at present? (1 point)
Modern scientists accept only new scientific theories.
Most of the scientists worldwide do not accept this theory.
All old theories change into new theories over a period of time.
Newspapers and science magazines do not publish this theory any more.
Answer:
Most of the scientists worldwide do not accept this theory.
Explanation:
Lamarck's theory states that acquired traits can be passed on from parents to offspring. This theory can not be sufficiently substantiated by indisputable scientific evidences hence it is not accepted by majority of scientists worldwide.
Since science is empirical and the theory is mostly based on vague speculations rather than concrete evidence, it was long rejected by many biologists.
This theory suggests that all life forms will gradually evolve from simple to complex organisms while the simple organisms gradually disappear. This is not the case.
What happens te energy in an open system
A Energy can ex but not enter an open system,
B Energy cannot enter or exit an open system
6. Energy can enter but not exit an open system,
D Energy can enter er alt an open system
Answer:
A
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Which is a group of tissues that work together to carry out a common function?
cell
organ
organelle
organ system
Answer:
Organ as a group of tissues working together is an organ.
A solution is prepared by mixing 0.10 of 0.12 M sodium chloride with 0.23 L of a 0.18 M magnesium chloride solution. What is the pCl- of the resulting solution?
Answer:
pCl⁻ = 0.54
Explanation:
First we calculate how many Cl⁻ moles are coming from each substance, using the given volumes and concentrations:
0.12 M NaCl * 0.10 L = 0.012 mol NaCl = 0.012 mol Cl⁻0.18 M MgCl₂ * 0.23 L = 0.0414 mol MgCl₂ = (0.0414 * 2) 0.0828 mol Cl⁻The final volume of the mixture is = 0.10 L + 0.23 L = 0.33 L
Now we calculate [Cl⁻], using the total number of Cl⁻ moles and the final volume:
[Cl⁻] = (0.012 mol + 0.0828 mol) / 0.33 L = 0.29 MFinally we calculate the pCl⁻ of the resulting solution:
pCl⁻ = -log[Cl⁻]pCl⁻ = 0.54The ratio of zinc to copper in some alloy is 2 to 5. If 60 kilograms of zinc are used, how many kilograms of copper are needed to make this alloy
Answer:
The correct answer is 150 kilograms.
Explanation:
Based on the given information, the ratio of zinc and copper within the alloy is 2:5. The amount of zinc used in the alloy is 60 kg. Now the amount of copper used within the alloy would be,
Zinc/Copper = 2/5
60/Copper = 2/5
Copper(Cu) = 60*5/2
Cu = 150 Kilograms.
Thus, the amount of Cu used in the alloy is 150 Kg.
What's the purpose for a graduated cylinder
Answer:
Graduated cylinders are long, slender vessels used for measuring the volumes of liquids. They are not intended for mixing, stirring, heating, or weighing. Graduated cylinders commonly range in size from 5 mL to 500 mL.
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The pH of a 0.0001 M NaOH solution is (note: For strong bases such as NaOH, the hydroxide ion concentration is the same as the concentration
of the base)
10
5
а
Ob
о с
Od
3
8
Answer:
pH = 10
Explanation:
As the problem states, with strong bases the hydroxide ion concentration [OH⁻] is equal to the concentration of the base. That means that in this case:
[OH⁻] = 0.0001 MWith [OH⁻] we can calculate the pOH of the solution:
pOH = -log[OH⁻]pOH = 4Then with the pOH, we calculate the pH of the solution:
pH = 14 - pOHpH = 10he specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be
Complete question is;
The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The specific heat capacity of a certain substance has been measured to be 3.52 J/g°C. Suppose 420.0 g of the substance is heated until the temperature of the sample has changed by 43.8 °C.
Write an equation that will let you calculate the last Q that was needed for this temperature change. Your equation should contain only symbols. Be sure to define each symbol.
Answer:
Q = m•c•Δt
Q = 64753.92 J
Explanation:
We are given;
Mass (m) = 420 g
Change in temperature; (Δt) = 43.8 °C
Specific heat capacity (c) = 3.52 J/g °C
The last Q is simply the heat energy that caused that temperature change.
This is given by the formula;
Q = m•c•Δt
Plugging in the relevant values;
Q = 420 × 3.52 × 43.8
Q = 64753.92 J
Tricia is a forensic scientist who has been asked to help train police officers. What is MOST likely to be the title of her training session?
ОА.
How to Be an Expert Witness
OB. How to Perform an Autopsy
ОС. .
How to Collect Evidence
OD.
How to Hack a Computer
Answer: OB How to collect evidence.
Explanation: Forensics deals with evidence and analyzing it.
Since Tricia is a forensic scientist, the most likely title of her training session will be How to Collect Evidence.
Who is a Forensic Scientist?A forensic scientist a scientist who collects evidence in order to investigate crimes .
Since Tricia is a forensic scientist, she will be training the police officers on how to collect evidence at crimes scenes as well as to conduct thorough investigations.
Therefore, the most likely title of her training session will be How to Collect Evidence.
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calculate the percentage of oxygen in Al(NO3)3
Answer;
4.29%
Explanation:
molecular weight of Al(NO3)3 is
27+(14+16*3)3=213 amu
total mass of oxygen is 3*3=9 amu
percentage is 9/213*100=4.25%