Answers
Answer: 3. basic
Explanation:
pH is the measure of acidity or alkalinity of a solution.
pH is measured by taking negative logarithm of hydrogen ions concentration.
Electrolyte is a solution which contains ions dissolved in water and hence is a good conductor of electricity.
A basic solution has more concentration of as compared to
.
An neutral solution has equal concentration of as that of
.
An acidic solution has more concentration of as compared to
.
Related Questions
How many moles of atoms are in 9.00 g of 13c? express your answer numerically in moles?
Ammonia, NH3, is used as a refrigerant. At its boiling point of –33 oC, the standard enthalpy of vaporization of ammonia is 23.3 kJ/mol. How much heat is released when 50.0 g of ammonia is condensed at –33 oC?–0.466 kJ–7.94 kJ–36.6 kJ–68.4 kJ–1.17 x 103 kJ
All light travels at the same speed.O TrueO False
Impulse is ___ momentum. A. only a decrease in B. a change in c. not related to D. only an increase in
Answers
Answer:
FALSE
Explanation:
Grunge refers to the genre of rock music and the fashion inspired by it. It originated in the mid-1980s in Seattle, Washington State.
Grunge was described as the fusion of punk rock and heavy metal.
This genre of music became popular in the early mid-1990s and included lyrics based on the theme of emotional and social alienation, betrayal, abuse, trauma etc.
Answers
"206.46 J/g" energy required to heat the solid iron.
Energy due to change in temperature:
The movements or the activity of microscopic particles known as atoms, molecules, or ions in solids, solvents, as well as gases.
Thermal energy may go from one item towards the another one.
Given:
Temperature, °C
°C
Change,
We know the relation,
→
By putting the values,
J/g
Thus the answer above is right.
Find out more information about energy here:
Answer:
Explanation:
Hello,
In this case, since the energy due to the change of temperature is computed via:
Thus, since the specific heat of iron is 0.444 J/(g°C), the heat per unit of mass turns out:
Best regards.
Answers
Answer:
See attachment
Explanation:
The amine group of N,N-dimethylaniline is an electron-donating group and will cause the benzene ring to act as a nucleophile in an electrophilic aromatic substitution reaction with the diazonium salt of sulfanilic acid.
A. Gain 2 electrons
B. Gain 3 electrons
C. Lose 2 electrons
D. Lose 3 electrons
Answers
Nitrogen changes from +5 in - to +2 in NO. This means nitrogen has gained 3 electrons. Option B
To determine the change in electrons for nitrogen in the given reaction, we need to compare the oxidation state of nitrogen in the reactant (-) and the product (NO).
In the reactant, -, nitrogen is in the +5 oxidation state. This is because oxygen has an oxidation state of -2, and there are three oxygen atoms in -. Therefore, nitrogen must have an oxidation state of +5 to balance the overall charge of
-.
In the product, NO, nitrogen is in the +2 oxidation state. This is because oxygen has an oxidation state of -2, and there is only one oxygen atom in NO. Therefore, nitrogen must have an oxidation state of +2 to balance the overall charge of NO.
By comparing the oxidation states of nitrogen in the reactant and the product, we can determine the change in electrons. The change in oxidation state corresponds to the change in the number of electrons gained or lost by the nitrogen atom.
In this case, nitrogen changes from +5 in - to +2 in NO. This means nitrogen has gained 3 electrons.
Therefore, the correct answer is B) Gain 3 electrons.
The nitrogen atom undergoes a reduction because it gains electrons, reducing its oxidation state from +5 to +2 in the reaction.
Option B
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Answers
Final answer:
The range of radii of most atoms is typically in the nanometer scale (nm) and can be measured using the covalent radius. The size of an atom's nucleus is much smaller than the atom itself. The Bohr model provides a formula to calculate the radius of hydrogen-like atoms.
Explanation:
The range of radii of most atoms is typically in the nanometer scale (nm). The covalent radius, which is defined as half the distance between the nuclei of two identical atoms when they are joined by a covalent bond, provides a practical way to measure the size of atoms. As we move down a group in the periodic table, the covalent radius generally increases, indicating a larger size of the atom. For example, the covalent radius of the halogens increases as we move from fluorine to iodine.
The size of an atom's nucleus, on the other hand, is much smaller than the atom itself. The nucleus has a diameter of about 10-15 meters, while the typical atom has a diameter of the order of 10-10 meters. This difference in size illustrates the emptiness of atoms, with the distance from the nucleus to the electrons being typically 100,000 times the size of the nucleus.
The Bohr model provides a formula to calculate the radius of hydrogen-like atoms, which depends on the principal quantum number (n) and the atomic number (Z). The calculated radii of the orbits of the hydrogen atom have been experimentally verified to have a diameter of a hydrogen atom.
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Final answer:
The range of radii of most atoms is typically measured in nanometers (nm). Covalent radius and hydrogen-like orbits are two methods used to estimate the size of atoms. The size of an atom can vary depending on the element and measurement technique, but most atoms have radii on the order of nanometers (nm).
Explanation:
The range of radii of most atoms is typically measured in nanometers (nm). The size of an atom can be estimated using various techniques. One commonly used measure is the covalent radius, which is defined as one-half the distance between the nuclei of two identical atoms when they are joined by a covalent bond. The covalent radii of different elements can be found in tables and can vary depending on the element and its position in the periodic table.
Another way to estimate the size of atoms is by looking at the sizes of their orbits in hydrogen-like atoms. These orbits are given in terms of their radii by a mathematical expression that includes a constant called the Bohr radius, which is approximately 5.292 × 10-11 m.
Overall, the size of an atom can vary depending on the element and the specific measurement technique used, but most atoms have radii on the order of nanometers (nm).
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Answers
Answer:
Around 2.0 L of ethylene glycol needs to be added to the car radiator
Explanation:
The depression in freezing point ΔTf of a solution is directly proportional to its molality (m), i.e.
From the given information:
= freezing pt of solution = -10.0 C
= freezing pt of pure solvent = 0 C
Kf = freezing pt depression constant = 1.86 C/m
i = 1 for ethylene glycol antifreeze
Volume of water = 6.50 L = 6500 ml
Density of water = 1.00 g/ml
Therefore mass of water =
Molar mass of ethylene glycol = 62 g/mol
Mass of ethylene glycol needed =
Density of ethylene = 1.11 g/ml
Therefore, volume needed =
m = 8.60 = moles solute / 6.50 Kg
moles solute = 55.9
mass solute = 55.9 x 62.068 g/mol=3470 g
V = 3479/ 1.11 =3126 mL= 3.13 L
delta T = 8.60 x 0.512 =4.40
boling point = 104.4 °C
Hope this helps.