The reaction described is the transformation of an aldehyde into an acid. Tollens reagent may be applied to carry out this change. In actuality, Tollens reagent is di-ammine-silver(I) complex (Ag(NH3)+2)Ag(NH3)+2).
What does the tollen chemical test for?Aldehydes are tested for using Tollens' reagent, an alkali solution of ammoniacal silver nitrate. Silver ions emerge from solution as both a brown deposit of silver(I) oxide, Ag2O, in the presence pf hydroxide ions (s).
What is tollens with Fehling's reactant?Compared to Fehling's reagents, Tollen's reagent has a stronger oxidizing solution. Unlike Fehling's test, which only works for aliphatic aldehydes, it can oxidize both and aromatic aldehydes. Ketones are not found in either test's results. Both assays are frequently used to determine whether reducing sugars are present.
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Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.32 × 1014 Hz.
Answer:
474 nm or 4.74 x 10^2 nm
Explanation:
c = λv
c (speed of light) = 2.998 x 10^8 m/s
λ = ?
v = 6.32 × 1014 Hz = 6.32 × 1014 1/s
2.998 x 10^8 m/s = (λ)(6.32 × 10^14 1/s)
λ = (2.998 x 10^8 m/s) / (6.32 × 10^14 1/s)
λ = 4.74 x 10^-7 m
λ = 4.74 x 10^-7 m x (1 x 10^9 nm/1 m) = 474 nm
Which expression represents the concentration of OH– in solution?
a. 10–14 / [H3O+]
b. [OH–] / 10–14
c. 10–14 – [H3O+]
d. 10–14 x [H3O+]
4) Which of the following can cause erosion?
- Glaciers, wind, and animals
- Acid rain, animals, and ice wedging
- Wind, water, glaciers
- Glaciers, wind, and acid rain
5) Which factors affect the rate of weathering?
- Temperature, ocean currents, and tides
- Type of rock and amount of precipitation
- Type of plants and animals
- Amount of sunlight
Water, air, and even ice are fluids because they tend to flow from one place to another due to the force of gravity.
Rainfall and temperature can affect the rate in which rocks weather. High temperatures and greater rainfall increase the rate of chemical weathering. 2. Rocks in tropical regions exposed to abundant rainfall and hot temperatures weather much faster than similar rocks residing in cold, dry regions.
Which of the following environments are low-level areas that can be temporarily or seasonally filled with water?
Rainforest
Swamp
Tundra
Wetland giving brainlist HAS TO BE RIGHT
Answer:
Rainforest
Explanation:
Swamps are permanently filled with water
and Tundras are dry and cold so the answer should be Rainforest
Answer:
its rainforest it's a it's
Explanation:
someone help with this will mark brainliest
Answer:
The main difference between emission and absorption spectra is that an emission spectrum has different coloured lines in the spectrum, whereas an absorption spectrum has dark-coloured lines in the spectrum.l
In an ocean wave, what happens to a water molecule after it transfers its kinetic energy to another water molecule?
In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. ... In water waves, energy is transferred through the vibration of the water particles.
How many moles of Hydrogen fluoride are formed from 10 moles of fluorine?
200.063
Hope this helps :T
If 1.3 moles of silicon dioxide react with 2.5 moles of carbon, how many grams of carbon
monoxide form?
Answer:
46.76 g
Explanation:
The reaction that takes place is:
SiO₂ + 3C → SiC + 2COFirst we determine the limiting reactant:
1.3 moles of SiO₂ would react completely with (3 * 1.3) 3.9 moles of C. There are not as many C moles, meaning that C is the limiting reactant.
Now we convert C moles (the limiting reactant) into CO moles, using the stoichiometric coefficients:
2.5 mol C * [tex]\frac{2molCO}{3molC}[/tex] = 1.67 mol COFinally we convert 1.67 moles of CO to grams, using its molar mass:
1.67 mol CO * 28 g/mol = 46.76 gperiodic table for the first twenty elements
Answer:
periodic table for the first twenty elements
Answer:
Explanation:
hope this helps
Match each definition to the appropriate term.
a. The condition that a reaction takes place without outside help _________
b. Difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature ________
c. Sum of the internal energy plus the product of the pressure and volume for a reaction _________
d. The extent of randomness in a system __________
e. Solution in which no more solute can be dissolved in the solven ________
1. Gibbs free energy
2. Spontaneity
3. Saturated solution
4. Entropy
5. Enthalpy
Answer:
a. The condition that a reaction takes place without outside help Spontaneity
b. Difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature Gibbs free energy
c. Sum of the internal energy plus the product of the pressure and volume for a reaction Enthalpy.
d. The extent of randomness in a system Entropy
e. Solution in which no more solute can be dissolved in the solven Saturated solution
Explanation:
(a) SPONTANEITY - The quality of being natural rather than planned in advance is described as spontaneity.
(b) GIBBS FREE ENERGY - Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity used to quantify the maximum amount of work that can be performed in a thermodynamic system when the temperature and pressure are held constant. The symbol ‘G' stands for Gibbs free energy.
(c) ENTHALPY - The heat absorbed or released during a process at constant pressure is equal to the Enthalpy shift. While “enthalpy” is often referred to as “heat content,” most people prefer to refer to it as “enthalpy.”
(d) ENTROPY - Entropy is the amount of thermal energy in a device per unit temperature that can't be used to do useful work. Since work is produced by ordered molecular motion, entropy is also a measure of a system's molecular disorder, or randomness. For several everyday phenomena, the idea of entropy offers profound insight into the direction of spontaneous change.
(e) SATURATED SOLUTION - A saturated solution is a chemical solution that contains the maximum amount of dissolved solute in the solvent. In a saturated solution, the extra solute will not dissolve. A number of factors influence the amount of solute that can be dissolved in a solvent to form a saturated solution.
Plz help me plz I am timed!!
Answer:
full moon
Explanation:
....ur welcome..............
Answer:
full moon
Explanation:
1. Write the chemical formula for possium (IV) oxyalide.
Answer:
Explanation:
Potassium oxyalide
Chemical formula K2O
Molar mass 94.196 g·mol−1
Appearance Pale yellow solid
Odor Odorless
If 1.45 moles of Sodium Bromide are added to a 7.5 M solution, what is the volume of the solution made?
Answer:
0.193 L
Explanation:
Another way of writing the question would be: What volume of a 7.5 M Sodium Bromide solution would contain 1.45 moles.
To answer that we can use the definition of molarity:
Molarity = moles / litersWe input the given data:
7.5 M = 1.45 moles / litersAnd calculate how many liters are required:
1.45 mol / 7.5 M = 0.193 LWhat attractive force pulls electrons toward protons to form chemical bonds?
A. Chemical bonding
B. Attraction of opposites
C. Electronegativity
D. Ionization energy
Answer:
C). Electronegativity.
Explanation:
'Electronegativity' is described as the tendency or a measure of the ability of an atom or molecule to attract electrons that leads to the formation of chemical bonds. It is denoted by 'χ', a Greek letter. The elements like Fluorine having a very high rate of electronegativity, its atom would attract the electrons more strongly while the elements with lesser electronegativity like Cesium would possess a lesser tendency to attract electrons towards it in order to form a bond. Thus, option C is the correct answer.
A human hair is 75 um across. How many inches is this?
Answer:
2.9528e-6
Explanation:
or 0.0029
:^
Calculate the mass of a sample of CaCl2 containing 2 mol of this substance
Answer:
221.96 g
Explanation:
Step 1: Given data
Moles of calcium chloride (n): 2 mol
Step 2: Calculate the molar mass of calcium chloride
The molar mass of the compound is equal to the sum of the molar masses of the elements that form it.
M = 1 × M(Ca) + 2 × M(Cl)
M = 1 × 40.08 g/mol + 2 × 35.45 g/mol = 110.98 g/mol
Step 3: Calculate the mass (m) of calcium chloride
We will use the following expression.
m = n × M
m = 2 mol × 110.98 g/mol = 221.96 g
Which expression represents the concentration of OH– in solution?
a. 10–14 / [H3O+]
b. [OH–] / 10–14
c. 10–14 – [H3O+]
d. 10–14 x [H3O+]
Question 1
Describe a procedure you could follow to determine the specific heat of a 45-g piece of metal.
QUESTION TWO
2.1
Discuss the process of the scientific method and clarify what is meant
by the science process skills.
(5)
Answer: The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation.
Explanation:
Hope this helps. :)
Please help with yes or no
A sample of copper has a density of 10.50g/cm3 and measures of 0.400 dm long,20.0 mm high and 0.003 m thick. What is the mass in grams of this block of copper metal?
The sky on Earth is blue because blue light is scattered through the atmosphere as the other colors of light pass
through undisturbed. Which nebulae have something similar happening?
Emission nebulae
Dark nebulae
Reflection nebulae
Planetary nebulae
Answer:
C
Explanation:
calculate the amount of heat energy required to heat up 23.2 grams of ice from -21° C to 56° C ** please show your work**
The second option 1,870.4 Joules
first American president
1. During an endothermic chemical reaction, a gas is consumed and a liquid produced.
a. Yes.
b. No.
c. Can't decide with information given.
2. A gas condenses to a liquid, neither absorbing nor releasing heat.
a. Yes.
b. No.
c. Can't decide with information given.
Calculate the number of miles of magnesium,chlorine, and oxygen atoms in 5.00 moles of magnesium perchlorate
Answer:
5.00 mol Mg
10.0 mol Cl
40.0 mol O
Explanation:
Step 1: Given data
Moles of Mg(ClO₄)₂: 5.00 mol
Step 2: Calculate the number of moles of Mg
The molar ratio of Mg(ClO₄)₂ to Mg is 1:1.
5.00 mol Mg(ClO₄)₂ × 1 mol Mg/1 mol Mg(ClO₄)₂ = 5.00 mol Mg
Step 3: Calculate the number of moles of Cl
The molar ratio of Mg(ClO₄)₂ to Cl is 1:2.
5.00 mol Mg(ClO₄)₂ × 2 mol Cl/1 mol Mg(ClO₄)₂ = 10.0 mol Cl
Step 4: Calculate the number of moles of O
The molar ratio of Mg(ClO₄)₂ to Cl is 1:8.
5.00 mol Mg(ClO₄)₂ × 8 mol O/1 mol Mg(ClO₄)₂ = 40.0 mol O
The compound borazine consists of 40.29% boron, 7.51%
hydrogen, and 52.20% nitrogen, and its molar mass is
80.50 g/mol. Calculate the molecular formula for borazine.
Answer:
[tex]B_3H_6N_3[/tex]
Explanation:
Hello there!
In this case, since the mass percentages in a compound which is wanted to know the molecular formula, can be assumed to be the masses, we first need to compute the moles they have in the formula unit:
[tex]n_B=40.29gB*\frac{1molB}{10.811gB} =3.73molB\\\\n_H=7.51gH*\frac{1molH}{1.01gH} =7.44molH\\\\n_N=52.20gN*\frac{1molN}{14.01gN} =3.73molN[/tex]
Next, we divide each moles by the fewest ones (3.73 mol) in order to find the subscript in the empirical formula first:
[tex]B:\frac{3.73}{3.73}=1 \\\\H:\frac{7.44}{3.73}=2\\\\N:\frac{3.73}{3.73}=1[/tex]
Then, the empirical formula is BH2N whose molar mass is 26.83 g/mol, so the ratio of molecular to empirical is 80.50/26.83=3; therefore, the molecular formula is three times the empirical one:
[tex]B_3H_6N_3[/tex]
Best regards!
Acid formulas usually start with ______________ because they have hydrogen atoms combined with other atoms in their molecules
Answer:
H
Explanation:
Example,
HCl for hydrochloric acid
H2SO4 for sulphuric acid
HNO3 for nitric (v) acid
Explain why the upper phase, after reflux, contained the 1-bromopentane, even though its expected density is 1.276 g/cm3, and the density of water is ~1.00 g/cm3. Think what is in the aqueous solution (e.g., what is the density of salt water
Answer:
The water is not pure i.e. It contains some hydroxide and bromobutane ions that is why the upper phase contains 1-bromopentane
Explanation:
The upper phase after reflux will contain 1-bromopentane even when its density is 1.276g/cm^3 because even though the density of water = 1.00g?cm^3 the water is not pure i.e. It contains some hydroxide and bromobutane ions making it to stay at the bottom while 1- bromobutane stays at the upper phase
can be used to help an individual with an eating disorder learn better ways to cope with stress an
replace unhealthy behaviors with those that do not cause harm.
A. Preventative care
B. Hospitalization
C. Medication
D. Psychotherapy
Answer: Psychotherapy
Explanation:
Edge
Answer:
D. Psychotherapy
Explanation:
Did the test