Answer:
the volume delivered by the pipette = 22.32 mL
Explanation:
To calculate this, let us first note that the density of water relates it weight and its volume (density = mass ÷ volume), hence we are going to use density to determine the volume.
Density of water = mass/volume = 0.997 g/ mL
mass = 22.25g
Density = 0.997g/mL
volume = ?
[tex]density = \frac{mass}{volume}\\\therefore volume = \frac{mass}{density}\\volume = \frac{22.25}{0.997}\\volume = 22.32\ mL[/tex]
∴ the volume delivered by the pipette = 22.32 mL
Please note that this calculation is based on the fact that the weight of the empty flask has been determined and canceled out.
Scientists must be open to questioning everything, even the things they think they already know. Which sentence from the article provides the BEST support to the statement above? (A) Scientific discoveries do not take place overnight, and many are small and gradual. (B) Chances are, you'll stumble many times before you find your footing, and that's OK. (C) We live in a world where knowledge and uncertainty can and do coexist. (D) When we are curious about other people, we can become more compassionate.
Answer:
The sentence that best supports the statement above is (C) We live in a world where knowledge and uncertainty can and do coexist
what type of reactions are the following? ( single displacement, double displacement, synthesis, or decomposition)
4Mn3O4(s) + O2(g) -> 6Mn2O3(s)
Al2O3(aq) + 3C(s) ->3CO(g) + 2Al(l)
Ba(C2H3O2)2(aq) + Na2CO3(aq) -> BaCO3(s) +2NaC2H3O2(aq)
KOH(aq)+HBr(aq) -> KBr(aq)+H2O(l)
Answer:
1. synthesis
2. single displacement
3.double displacement
4.double displacement
Explanation:
1. here Mangananes (iv) oxide further reacts with oxygen to form Manganese (iii) oxide , two reactants making one product .
2. Carbon replaces aluminium from aluminium oxide to make pure aluminium and carbon monoxide and carbon dioxide.
3. sodium replaces barium to make sodium acetate , barium replaces sodium to make barium carbonate ( precipitate )
4. potassium replaces Hydrogen to produce potassium bromide, while hydrogen and hydroxide ions combine to make water .
List three types of cyclic motion. FIRST GET BRAINLEIST
Answer:
translational, rotational, and oscillatory.
Explanation:
For all six solutions tested during this experiment,
the
is always the same. That
means that it is a constant throughout the
experiment
You can infer from this experiment that the
difference in the solutions is due to the
which will cause different flame
colors.
Answer:
1. Chloride ion
2. Metal ion
3. The same as a sample with the identical metal ion.
Explanation: I Just took the quiz on Edge 2021
List at least four characteristics of salts.
Please help me hurry
50points
Answer:
Salt is cubed, crystal like, grainy, and shiny
Explanation:
Answer:
salt is basic in nature
it is of diffrent type
they are of 4 type
1 is sodium hydroxide
2 is bleaching powder
3 is baking soda
4 is washing soda
20 mL of 0.25 M of NH 3 is titrated with 0.40 M HCl. Calculate the pH of the solution after 20 mL HCl is added. Kb (NH3) = 1.8 × 10 −5.
a. 12.50
b. 7.00
c. 4.74
d. 1.12
Answer:
the pH of the solution after 20 mL HCl was added is 1.12
Option d) 1.12 is the correct answer
Explanation:
Firstly; number of mmols of NH₃ before addition of HCl = M x V = 0.25 x 20 = 5
Also number of mmols pf HCl added = M x V = 0.40 x 20 = 8
Number of mmols of NH₄Cl formed
= number of mmols of NH3 before addition of HCl = 5
Number of mmoles of HCl remained = 8 – 5 = 3
Therefore Total volume of solution = 20 + 20 = 40 mL
Molarity of HCl = 3 / 40 = 0.075 M
Molarity of NH₄Cl = 5 / 40 = 0.125 M
Therefore
Ka x Kb = 10⁻¹⁴
Ka x 1.8 x 10⁻⁵ = 10⁻¹⁴
Ka (NH₄Cl) = 5.56 x 10⁻¹⁰
[H+] from HCl = 0.075 M
[H+] from NH₄Cl = (Ka x C)^1/2
= (5.56 x 10⁻¹⁰ x 0.125)^1/2 = 8.34 x 10⁻⁶
Hence, [H+] from NH₄Cl is negligible.
pH = -log 0.075
pH = 1.12
Therefore the pH of the solution after 20 mL HCl was added is 1.12
Option d) 1.12 is the correct answer
Genes can be best defined as:
A. the traits expressed by the organism
B. the DNA that make up a chromosome
C. a form of reproduction
D. section of DNA that codes for a specific trait
Answer:
D. section of DNA that codes for a specific trait
Explanation:
Genes are sections of the DNA that codes for a specific trait. They are simply defined as the basic physical and functional unit of hereditary.
Genes are usually found encoded in the DNA. The effects produced by genes result from their coordination of certain protein synthesis activities. Inheritance is attained when genes are passed from parents to offspring.How many moles are in 8.30 X 10 to the power of 23, molecules of CO2?
Answer:
1.38 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{8.3}{6.02} \\ = 1.3787...[/tex]
We have the final answer as
1.38 molesHope this helps you
As a mixed two substance in a test tube she noticed that the test tube because warm she also noticed gas coming from the test tube based on mias observation what was most likely occurring inside the test tube
Answer:
A new substance was forming
Explanation:
The attraction that nonpolar molecules have for each
other is primarily caused by the presence of
Answer:
Van der waals forces
Explanation:
I just know
8. How much heat is released when 85.0 g of steam condense to liquid water?
Answer:
199920J
Explanation:
Given parameters:
Mass of steam = 85g
Unknown:
Heat released when the liquid is condensed = ?
Solution:
The heat released by the substance is given as;
H = mL
H is the heat released
m is the mass
L is the latent heat of steam = 2352J/g
Heat released = 85 x 2352 = 199920J
Sulfur (S) and oxygen gas (02) undergo a chemical
reaction to form sulfur trioxide (SO3).
Answer:
C
Explanation:
I just think it is the right answer :) Sorry if I am wrong..
Answer:
c
Explanation:
Which orbitals cannot exist?
2p 3p 4d 3f 6s 2d
Mark all that are wrong.
Answer:
The orbitals 3f and 2d cannot exist.
Explanation:
Hello!
In this case, considering the attached picture in which you find each energy level with the corresponding number of subshells, it is possible to infer level one has s subshell only, level 2 s and p, level 3 has s, p and d and from level 4 to 7 have s, p, d f, therefore, the orbitals 3f and 2d cannot exist.
Best regards!
What does a weather map use to represent areas of high air pressure?
An "A"
An "H"
An "L"
A "P"
Answer:
H
Explanation:
Sam read that all subsystems interact with each other. Which example shows how changes in the cryosphere can affect the geosphere?
Answer:
Land that gains weight can rise slowly.
Explanation:
:D
Please help answer!!!
Answer:
C stays the same ez
Explanation:
Vsepr diagram for phcl2
4. An atom is neutral because it has the same number of protons as it has:
electrons
O neutrons
O Neither... An atom isn't neutral!
Taking into account the constitution of an atom, an atom is neutral because it has the same number of protons as it has electrons.
Constitution of an atomAn atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Every atom consists of a nucleus in which neutrons and protons meet and energy levels where electrons are located.
The neutron is an electrically neutral subatomic particle, while the proton has a positive electrical charge. Electrons have a negative charge, move around the nucleus at different energy levels and are attracted to protons, positive in the atom through electromagnetic force.
Atom electrically neutralAn atom is considered electrically neutral when it has the same number of positive and negative charges. That is, an electrically neutral atom has the same number of protons (with a positive charge) and electrons (with a negative charge).
In summary, an atom is neutral because it has the same number of protons as it has electrons.
Learn more about atom electrically neutral:
brainly.com/question/1814899
brainly.com/question/2449569
#SPJ2
I did a chocolate lab. It was melting chocolate. These are the tree question please answer all. Please help me ASAP
Answer:
no the mass will not change
Explanation:
A piston contains 0.39L of air at 1.0 atm. If the pressure on the piston is increased to 5.6 atm, what is the new volume?
The new volume : 0.07 L
Further explanationBoyle's Law
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
P₁=1 atm
V₁=0.39 L
P₂=5.6 atm
[tex]\tt V_2=\dfrac{P_1.V_1}{P_2}\\\\V_2=\dfrac{1\times 0.39}{5.6}\\\\v_2=\boxed{\bold{0.07~L}}[/tex]
It is a vocal music of Mindoro
Answer:
instrumental music is used in festivals, rituals, etc.
Explanation:
suppose you wanted to make 100 grams of water what is the molar mass of water
This is how osmium appears in the periodic table.A purple box has O s at the center and 76 above. Below it says osmium and below that 190.23.
Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266
Answer:
it B 114 on edge 2020
Explanation:
UwU
Answer:
it B 114
Explanation:
What mass of water can be heated from 10.0 C to 38.0 Celsius by addition of 3,500j? (Specific heat capacity of water is 4.18 j/g C)
Mass of water : 29.904 g
Further explanationHeat can be formulated
Q=m.c.Δt
Q, heat, J
m,mass, g
c, specific heat, j/g C
Δt,temperature, C
Δt,temperature[tex]\tt 38-10=28^oC[/tex]
mass of water[tex]\tt m=\dfrac{Q}{c.\Delta t}\\\\m=\dfrac{3500}{4.18\times 28}\\\\m=29.904~g[/tex]
What mass (in g) of lithium metal can be produced by the electrolysis of molten LiCl for 23.93 hr with an electrical current of 17.7?
Answer:
1.828 g
Explanation:
The half-reaction is:
Li⁺ + 1e⁻ → Li(s)First we calculate the coulombs:
Coulombs = Amperes * seconds23.93 hr * 60 = 1435.8 sCoulombs = 17.7 A * 1435.8 s = 25413.66 CThen we calculate the number of lithium moles, using Faraday's constant:
25413.66 C * [tex]\frac{1mol(e^-)}{96485C} *\frac{1molLi}{1mol(e^-)}[/tex] = 0.2634 mol LiFinally we convert moles to grams:
0.2634 mol Li * 6.941 g/mol = 1.828 gILL GIVE BRAINLIST
How many valence electrons does boron gain when it becomes an anion?
A. 2
B. 3
C. 4
D. 5
Answer:
5
Explanation:
Consider the following isomerization reactions of some simple sugars and values for their standard Gibbs free energy ΔGo:reaction A: glucose-1-phosphate rightarrow glucose-6-phosphate, ΔGo = -7.28 kJ/mol reaction B: fructose-6-phosphate rightarrow glucose-6-phosphate, ΔGo = -1.67 kJ/molCalculate for the isomerization of glucose-1-phosphate to fructose-6-phosphate.Calculate the equilibrium constant K for the isomerization of glucose-1-phosphate to fructose-6-phosphate at 298 K.
Answer:
Explanation:
glucose-1-phosphate → glucose-6-phosphate, ΔGo = -7.28 kJ/mol
fructose-6-phosphate → glucose-6-phosphate, ΔGo = -1.67 kJ/mol
subtracting the equation
glucose-1-phosphate - fructose-6-phosphate = 0 , ΔGo = -7.28 - ( -1.67 ) kJ / mol
glucose-1-phosphate = fructose-6-phosphate ΔGo = - 5.61 kJ / mol
- ΔGo = RT lnK
5.61 x 10³ = 8.31 x 298 x lnK
lnK = 2.265
K = 9.63 .
What will the weather most likely be like if a low pressure system settles over an area
Answer:
Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day.
Explanation:
Which of these is the best procedure to determine the concentration of a basic solution?
Click the answer you think is right.
Titration with an acid
Flame test
Density determination
Precipitation followed by gravimetric analysis
Dilution with H20
Answer:
IM VERY SORRY HAVE A GOOD DAY\\
Explanation:
Which is a valid velocity reading for an object? 45 m/s 45 m/s north 0 m/s south 0 m/s
Answer:
45 m/s north
Explanation:
Edge 2020
Answer: (B) 45 m/s north
Explanation: right on edge 2020 (so basically the same reason as person above)
