Use Appendix C to choose the solution with the higher pH:0.35MAl(NO₃)₃ or 0.35MCr(NO₃)₃
Answers
The solution with the greater pH is 0.35MCr(NO₃)₃.
pHs of much less than 7 point out acidity, whereas a pH of larger than 7 suggests a base. pH is definitely a measure of the relative amount of free hydrogen and hydroxyl ions in the water. Water that has greater free hydrogen ions is acidic, whereas water that has extra free hydroxyl ions is basic.
For example, centred hydrochloric acid can have a pH of round -1, whilst sodium hydroxide answer can have a pH as excessive as 15.
Does greater pH imply extra acidic?Lower pH quantity skill improved acid, higher pH variety capacity enhanced base. It can be a little confusing, but the decrease the pH of a substance is, the improved of an acid it is.
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if it takes 54 ml of 0.100 M naoh to neutralize 125ml of an hcl solution, what is the concentration of the hcl
Answers
Answer:
c = 0.0432moldm ^−3
Explanation:
The first step would be to find the molar ratio in the reaction. Now generally, one can simplify strong acid-strong base reaction by saying:
Acid+Base ->Salt+ Water
draw the conjugate base for the following acid nh3+
Answers
The conjugate base of NH3+ is NH2-. The conjugate base is a substance that is produced when an acid loses a proton.
A base that gains a proton becomes an acid in a similar manner. NH3 is the conjugate base of the NH4+ acid. Similarly, HSO4- is the conjugate base of H2SO4, while HCO3- is the conjugate base of H2CO3.NH3+ is an acid that has lost a proton, resulting in NH2-.
NH3+ is an acid with a positive charge. When the acid loses a proton, the resulting base, NH2-, has a negative charge. It is now the conjugate base of the original acid.
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help asap please 50 points !!!!
Which of the following will always produce a magnetic force on a nearby iron nail?
O a long piece of copper wire
O a large static electric charge
O an electric current
O an electric field
Answers
Answer: An electric current
Explanation:
As there is magnetic effect of electric current i.e when there is an electric current passing through any conductor then is produces a magnetic field around it depending on its shape. so due to magnetic field and a current there will be a magnetic force applied.
The label on a pressurized can of spray disinfectant warns against heating the can above 130' F . What are the corresponding temperature on the Celsius and Kelvin temperature Celsius?
Answers
Answer:
54.44C and 327.59K
Explanation:
As we proceed from left to right in a series of elements in the Periodic Table, we note an increase in the
Answers
Answer:
Atomic size decreases from left to right in the Periodic Table.
Explanation:
s you move from left to right, the nucleus gains protons.
This increases the positive charge of the nucleus and its attractive force on the electrons.
At the same time, electrons are added to the atoms as you move from left to right across a period.
These electrons reside in the same energy shell and do not offer complete shielding.
The effect of the increasing proton number is greater than that of the increasing electron number.
As a result, the valence electrons are held closer to the nucleus, and the atomic radius decreases.
.A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players, he concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats.
Where is the flaw in his approach?
Answers
The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.
What was the experiment done by a student to test aluminum bats hit baseballs further than wooden bats?A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players.
He concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats. If aluminum bats were permitted for use in baseball then a lot of teams would begin to use them instead. This would reduce the demand for wooden bats and lead to their prices falling.
Therefore, The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.
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This chemical equation represents a chemical reaction.
NaCN + HBr + NaBr + HCN
Which two chemicals are reactants in the chemical reaction?
A.NaCN
B.NaBr
C.HCN
D.HBr
Answers
Answer: NaCN and HBr
Explanation:
El ácido sulfúrico H2SO4 es uno de los compuestos que se utiliza para la producción de fertilizantes como el nitrosulfato amónico. Si disponemos de 8 mL de H2SO4 al 37 %P/P (d=1,26 g /mL), los cuales se disolvieron hasta alcanzar un volumen de solución de 400 mL, con una densidad de 1,08 g/mL. (La densidad del soluto es corresponde a 1,83 g/cm³)
Answers
Explanation:
12 hours ago
El ácido sulfúrico H2SO4 es uno de los compuestos que se utiliza para la producción de fertilizantes como el nitrosulfato amónico. Si disponemos de 8 mL de H2SO4 al 37 %P/P (d=1,26 g /mL), los cuales se disolvieron hasta alcanzar un volumen de solución de 400 mL, con una densidad de 1,08 g/mL. (La densidad del soluto es corresponde a 1,83 g/cm³)
Please help due today
Answers
neodymium-145
Temperature (average kinetic energy) affects the density of a substance.
True
False
Answers
Answer:
True
Explanation:
Higher temperature will have greater volumes so the density will be less.
the process though which animals and plants produce offspring
Answers
Answer:
reproduction
Explanation:
can be asexual or sexual
. 125g of water has an initial temperature of 25.6°C, and is heated by 50.0g of a metal
which has been heated to 115.0°C. The metal heats the water so that both the metal
and the water reach a final temperature of 29.3°C. Calculate the specific heat of the
metal.
Answers
Answer : The specific heat of the metal is, \(0.451J/g^oC\)
Explanation :
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
\(q_1=-q_2\)
\(m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)\)
where,
\(c_1\) = specific heat of metal = ?
\(c_2\) = specific heat of water = \(4.18J/g^oC\)
\(m_1\) = mass of metal = 50.0 g
\(m_2\) = mass of water = 125 g
\(T_f\) = final temperature of mixture = \(29.3^oC\)
\(T_1\) = initial temperature of metal = \(115.0^oC\)
\(T_2\) = initial temperature of water = \(25.6^oC\)
Now put all the given values in the above formula, we get
\((50.0g)\times c_1\times (29.3-115.0)^oC=-[(125g)\times 4.18J/g^oC\times (29.3-25.6)^oC]\)
\(c_1=0.451J/g^oC\)
Therefore, the specific heat of the metal is, \(0.451J/g^oC\)
The percentages of carbon dioxide and oxygen have changed from Earth's early
atmosphere to Earth's atmosphere today,
Explain the processes that led to these changes.
Answers
Answer:
Explanation:
The early atmosphere
Scientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.
The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.
It is thought that the atmospheres of Mars and Venus today, which contain mostly carbon dioxide, are similar to the early atmosphere of the Earth.
Scientists can’t be sure about the early atmosphere and can only draw evidence from other sources. For example, volcanoes release high quantities of carbon dioxide. Iron-based compounds are present in very old rocks that could only have formed if there was little or no oxygen at the time.
Changes in the atmosphere
So how did the proportion of carbon dioxide in the atmosphere go down, and the proportion of oxygen go up?
The proportion of oxygen went up because of photosynthesis by plants.
The proportion of carbon dioxide went down because:
it was locked up in sedimentary rocks (such as limestone) and in fossil fuels
it was absorbed by plants for photosynthesis
it dissolved in the oceans
The burning of fossil fuels is adding carbon dioxide to the atmosphere faster than it can be removed. This means that the level of carbon dioxide in the atmosphere is increasing.
If the AGº for ATP hydrolysis is -30 kJ/mol and the AG" for phosphoenolpyruvate hydrolysis is -62 kJ/mol, what is the AGº for the phosphorylation of ADP by phosphoenolpyruvate? -92 kJ/mol +31 kJ/mol +92 kJ/mol -62 kJ/mol -32 kJ/mol
Answers
The AGº for the phosphorylation of ADP by phosphoenolpyruvate is equal to 32 kJ/mol.
The AGº for the phosphorylation of ADP by phosphoenolpyruvate can be calculated using the equation:
AGº = AGº (ATP hydrolysis) - AGº (phosphoenolpyruvate hydrolysis)
Given that AGº (ATP hydrolysis) = -30 kJ/mol and AGº (phosphoenolpyruvate hydrolysis) = -62 kJ/mol, then:
AGº = -30 kJ/mol - (-62 kJ/mol) = 32 kJ/mol
NADH: An increase in the concentration of NADH can inhibit PDH, as it competes with pyruvate for binding to the active site of the enzyme.
Acetyl-CoA: An increase in the concentration of acetyl-CoA can also inhibit PDH, as it acts as an allosteric inhibitor
Therefore, the AGº for the phosphorylation of ADP by phosphoenolpyruvate is equal to 32 kJ/mol.
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Potable water may be defined as:
a. Any water that occasionally may be polluted from another source
b. Any water that, according to recognized standards, is safe for consumption
c. Water high in organic content
d. Water that has been transported from outside the service area
Answers
The correct option is b. Any water that, according to recognized standards, is safe for consumption
Potable water is water that is considered safe and suitable for human consumption according to recognized standards. This means that the water has been treated and tested to ensure that it is free from harmful contaminants and meets specific quality criteria for drinking water.
Potable water is typically treated to remove contaminants such as bacteria, viruses, parasites, chemicals, and other substances that may be harmful to human health. It is an essential resource for human health and well-being, and access to safe and reliable potable water is a basic human right. Therefore option b is right answer.
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Predict the approximate bond angles in each of the following molecules. Assume all unshared electrons are shown.
a. CH_2.
b. BeH_2.
Answers
(a)CH₂ is a linear molecule, the bond angle is 180°. (b) In BeH₂, the bond angle is also 180°.
a. CH₂:
In the molecule CH₂, carbon (C) is bonded to two hydrogen (H) atoms. Since carbon has four valence electrons and each hydrogen has one valence electron, there are a total of four electrons surrounding the carbon atom. The electron arrangement around the carbon atom is tetrahedral, with a geometry of sp³ hybridization.
However, since CH₂ is a linear molecule, the bond angle is 180°.
b. BeH₂:
In the molecule BeH₂, beryllium (Be) is bonded to two hydrogen (H) atoms. Beryllium has two valence electrons, and each hydrogen has one valence electron, making a total of four electrons surrounding the beryllium atom. The electron arrangement around the beryllium atom is linear.
Therefore, in BeH₂, the bond angle is also 180°.
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Compound Y dissolves in ethanol but not water what type of bond is Y ?
Answers
Covalent Bond.
Explanation: Covalent compound are soluble in organic solvents (non polar) but insoluble in water (polar).
Ethanol being both polar and non polar can dissolve covalent compound.
A sample of hydrogen gas occupies 1. 0 l at 760 torr in a balloon. If the temperature is kept constant, which expression represents the volume of hydrogen gas in liters when the pressure is raised to 860 torr?.
Answers
A sample of hydrogen gas occupies 1.0 L at 760 torr in a balloon. The temperature is kept constant. To calculate the volume of hydrogen gas in liters when the pressure is increased to 860 torr, we'll use Boyle's Law.
Boyle's Law is a gas law that states that the pressure and volume of a gas are inversely proportional when temperature is constant. This can be represented mathematically as: P₁V₁ = P₂V₂
Where, P₁ is the initial pressure of the gas, V₁ is the initial volume of the gas, P₂ is the final pressure of the gas, V₂ is the final volume of the gas
Let's substitute the values into the equation: P₁V₁ = P₂V₂
1.0 L x 760 torr = V₂ x 860 torr
V₂ = 0.88 L
Therefore, when the pressure is raised to 860 torr, the volume of hydrogen gas is 0.88 liters.
To calculate the volume of hydrogen gas in liters when the pressure is raised to 860 torr, we can use Boyle's Law. This law states that the pressure and volume of a gas are inversely proportional when temperature is constant. If one increases, the other decreases. Therefore, if we increase the pressure on the gas, the volume will decrease.
The formula for Boyle's Law is:
P₁V₁ = P₂V₂
where P₁ is the initial pressure of the gas, V₁ is the initial volume of the gas, P₂ is the final pressure of the gas, and V₂ is the final volume of the gas.
We know that the initial volume of the hydrogen gas is 1.0 L and the initial pressure is 760 torr. We also know that the final pressure is 860 torr. We can substitute these values into the formula and solve for V₂:
P₁V₁ = P₂V₂
1.0 L x 760 torr = V₂ x 860 torr
V₂ = 0.88 L
Therefore, when the pressure is raised to 860 torr, the volume of hydrogen gas is 0.88 liters.
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What is the most common solvent that is used in a solution?
Answers
Answer:
It's water.
Explanation:
Water is also called as universal solvent, because it's literally almost the only one we use.
Sorry if I spelled something wrong. I'm Dominican so yeah . I hope this helps you :)
Water
Explanation :
This is because water can act either as a base or an acid based on its stable pH. It is also termed as the universal solvent.
37. What name is given to the process in which mineral crystals change during metamorphism
Answers
The change in the particle size of the rock during the process of metamorphism is called recrystallization.
For instance, the small calcite crystals in the sedimentary rock limestone and chalk change into larger crystals in the metamorphic rock marble
6. Which two regions of Earth in the illustration are experiencing winter?
N
Sun
Position
A. Northern and Southern Hemispheres at position A
B. Northern Hemisphere at position A and Southern Hemisphere at position B
C. Northern and Southern Hemispheres at position B
D. Northern Hemisphere at position B and Southern Hemisphere at position A
Answers
Answer:
B
Explanation:
how do you balance _KCIO3 + __P4 → _P4010 + ___KCI
Answers
Which among the following represents a set of isotopes? Atomic nuclei that contain:
I) 5 protons and 5 neutrons
II) 5 protons and 6 neutrons
III) 6 protons and 6 neutrons
IV) 6 protons and 5 neutrons
V) 5 protons and 7 neutrons
Answers
Answer:
I, II.AND V ARE ISOSOPED WITH AN ATOMIC # OF 5
II AN IV ARE ISIOTOPES WITH AN ATOMIC# OF 6
Explanation:
Which among the following represents a set of isotopes? Atomic nuclei that contain:
I) 5 protons and 5 neutrons
II) 5 protons and 6 neutrons
III) 6 protons and 6 neutrons
IV) 6 protons and 5 neutrons
V) 5 protons and 7 neutrons
I, II.AND V ARE ISOSOPED WITH AN ATOMIC # OF 5
II AN IV ARE ISIOTOPES WITH AN ATOMIC# OF 6
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What types of biochemical reactions are primarily reductive in nature?
Answers
The types of biochemical reactions that are primarily reductive in nature are known as reduction reactions. Reduction reactions involve the gain of electrons or the decrease in oxidation state of a molecule, resulting in a reduction in its overall energy or the transfer of electrons from a donor to an acceptor molecule.
One prominent example of a reductive biochemical reaction is photosynthesis, where plants and some bacteria use sunlight energy to convert carbon dioxide (CO2) into glucose. In this process, carbon dioxide is reduced to glucose by accepting electrons and hydrogen atoms from water molecules. Another example is cellular respiration, specifically the electron transport chain, where electrons derived from the breakdown of glucose and other fuel molecules are transferred through a series of redox reactions, resulting in the reduction of molecular oxygen (O2) to water (H2O) as the final electron acceptor.
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hy is it necessary to use the kα transition ( 2p→1s ) in copper to generate x-rays? why not use, for example, the 4s→3p transition?
Answers
In order to generate X-rays, it is necessary to use the kα transition (2p→1s) in copper.
This is because this transition has a lower energy level than the 4s→3p transition, which means that it is easier to achieve the necessary energy levels to generate X-rays.
Additionally, the kα transition is a more efficient means of generating X-rays because it involves the emission of a photon with a higher energy level than the 4s→3p transition.
Therefore, using the kα transition in copper is the most practical and efficient way to generate X-rays.
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Dãy các chất tác dụng với nước ở nhiệt độ thường là
A. SO2, BaO, Mg.
B. Na2O, P2O5, K.
C. SO3, BaO, Fe.
D. CaO, BaO, Fe
Answers
Type the correct answer in the box. Express your answer to six significant figures. Given: K = °C 273. 15 What is the temperature of the flame in degrees Celsius? You measure the flame of a candle and get a reading of 1,376. 06 K. This value is equal to °C.
Answers
Temperature is measured by Kelvin and celsius and is a physical quantity. The temperature of the flame of a candle is \(\rm 1102.91^{\circ}C\).
What are Kelvin and celsius?Kelvin and Celsius are the degrees of the unit of temperature and measure the cold and hotness of the substance.
Given,
K = \(\rm ^{\circ} C + 273.15\)K = 1,376.06The formula of calculating temperature in Celsius is:
\(\rm K = ^{\circ}C + 273.15\)
Substituting values in this we get:
\(\begin{aligned}1,376.06 &= ^{\circ}\rm C + 273.15\\\\^{\circ}\rm C &= 1,376.06 - 273.15\\\\&= \rm 1102.91^{\circ}C\end{aligned}\)
Therefore, \(\rm 1102.91^{\circ}C\) the temperature of the candle burning.
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does the number of bonds for an atom change?
Answers
The number of bonds for an atom can change depending on the chemical reaction it undergoes.
Is the number of bonds for an atom subject to change?Atoms can form chemical bonds with other atoms to achieve a more stable state. The number of bonds an atom can form is determined by the number of valence electrons it has. Valence electrons are the outermost electrons that are involved in bonding. When an atom undergoes a chemical reaction, it can either gain or lose electrons, or share electrons with other atoms to form new bonds. As a result, the number of bonds for that atom can change.
For example, when a hydrogen atom (H) and a chlorine atom (Cl) react, they form a hydrogen chloride (HCl) molecule. In this reaction, the hydrogen atom shares one of its electrons with the chlorine atom, forming a covalent bond. As a result, the hydrogen atom goes from having one bond to two bonds, while the chlorine atom goes from having one bond to three bonds.
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if the mass ratio of k to f in a compound is 2.06, how many grams of f are needed to react with 2.30 of k?
Answers
To determine the number of grams of element "f" needed to react with 2.30 grams of element "k", you can use the mass ratio provided in the problem. First, let's call the mass of "f" that is needed x. The mass ratio tells us that the mass of "f" is 2.06 times the mass of "k", so we can set up the following equation:
2.06 * x = 2.30
To solve for x, we can divide both sides of the equation by 2.06:
x = 2.30 / 2.06
This simplifies to:
x = 1.12 grams
Therefore, 1.12 grams of element "f" are needed to react with 2.30 grams of element "k".
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6.
A given volume of nitrogen gas required 68.3 seconds to diffuse through a tiny hole
in chamber. Under the same conditions, another unknown gas requires 85.6 seconds for
the same volume to diffuse. What is the molecular mass of this gas?
Answers
Answer:
Molar mass of the unknown gas is 8.96g/mol
Explanation:
Hello,
According to Graham's law of diffusion, its states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular mass
R = k (1/√(M))
R = rate of diffusion
M = molecular mass
R₁ / R₂ = √(M₂ / M₁)
R₁ = nitrogen = 68.3s
R₂ = unknown gas = 85.6s
M₂ = molecular mass of the unknown gas
M₁ = molecular mass of nitrogen = 14g/mol
68.3 / 85.6 = (√M₂ / 14)
0.8 = (√M₂ / 14)
Take square of both sides
0.8² = M₂ / 14
M₂ = 14 × 0.64
M₂ = 8.96g/mol
The molar mass of the unknown gas is 8.96g/mol