Answer:
2 and 3 explanation in the comments
9.
Unless specifically instructed to do so, what should you never put into a flame?
Answer:
Gas
Explanation:
Do not put any sub- stance into the flame unless specifically instructed to do so. Never reach over an exposed flame. Light gas (or alcohol) burners only as instructed by the teacher.
specific gravity of a vegetable oil is 0.85. What is its density?
How does the carbonyl group increase the reactivity of carboxylic acids?
Answer:
The relative reactivity of carboxylic acid derivatives toward nucleophile substitutions is related to the electronegative leaving group's ability to activate the carbonyl. The more electronegative leaving groups withdraw electron density from the carbonyl, thereby increasing its electrophilicity.
Hope it helps you.4(a) Why doesn't the water flow out when the hand that presses the cardboard is removed? *
1. water inside glass is lighter
2. there is much water inside the glass
3. cardboard is supported by air pressure
4.
cardboard is strong enough to hold the water
Question 25 of 30
Several dyes were mixed together and dissolved in water. You need to
determine which dyes are in the solution, but not separate the entire mixture.
How can you separate out a small sample of the dyes for identification
purposes, but not separate the entire mixture?
A. By distilling the dyes
B. By filtering the dyes
C. By using oils to distill the dyes
D. By using chromatography
SUBMIT
We can separate out a small sample of the dyes for identification purposes, but not separate the entire mixture by using chromatography.
What is Chromatography?Chromatography is a technique of separation of mixtures of liquids according to the nature of those liquids.
To get the process started, the mixture is dissolved in a substance called the mobile phase, which carries it through a second substance called the stationary phase.
The different components of the mixture travel through the stationary phase at different speeds, causing them to separate from one another. The nature of the specific mobile and stationary phases determines which substances travel more quickly or slowly, and is how they are separated. These different travel times are termed retention time.
Therefore, We can separate out a small sample of the dyes for identification purposes, but not separate the entire mixture by using chromatography.
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describe five factors which affect propagation of sound.. please describe in details.
Answer:
Explanation:
Image result for describe five factors which affect propagation of sound.. please describe in details.
There are several important factors which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. This refers to the spreading of sound energy as a result of the expansion of the wavefronts.
2. Using diagrams, briefly explain the following; i. Solvus ii. Eutectic iii. Eutectoid iv. Peritectic
Answer:
Solvus: A solvus is a line or surface on a phase diagram which separates a homogeneous solid solution from a field of several phases which may form by exsolution or incongruent melting.
Eutectic: Relating to or denoting a mixture of substances that melts and freezes at a single temperature that is lower than the melting points of the separate constituents or of any other mixture of them.
Eutectoid: relating to or denoting an alloy which has a minimum transformation temperature between a solid solution and a simple mixture of metals.
Peritectic: A peritectic reaction is a reaction where a solid phase and liquid phase will together form a second solid phase at a particular temperature and composition.
Thank you, if you find this helpful please comment.
what is the chemical formula of ( Rust ) ??
Answer:
[tex]Fe_2O_3[/tex]
Explanation:
The formula of Rust is Fe2O3 and also known as ferric oxide or iron oxide
------------------------
OAmalOHopeO
------------------------
Is the covalent bond BH2CL a polar nonpolar or ionic compound
BH2Cl is a polar compound because the molecule is non-symmetrical.
An ionic bond is usually formed between atoms having a high magnitude of electronegativity difference between them while covalent molecules tend to have a narrower range of electronegativity difference between atoms in the molecule.
In-between the two extremes are the polar covalent bonds which result from a significant electronegativity difference but less than that required for an ionic bond.
The B-Cl bond in BH2Cl is polar and the entire molecule is non-symmetrical hence the BH2Cl is a polar compound.
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calculate the number of moles in 2.5 particle NaOH
Answer:
1.5055×10²⁴
Explanation:
................................
7 f Find the volume in dm3 and in mole of 0.505m of NaoH required to react with 40ml of 0.505m
of H₂SO4 Solution
The volume of NaOH required is 0.08 dm³
To solve this question, we'll begin by writing the balanced equation for the reaction between H₂SO₄ and NaOH. This is illustrated below:
H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
Mole ratio of the acid, H₂SO₄ [tex](n_{A}) = 1[/tex]
Mole ratio of the base, NaOH [tex](n_{B}) = 2[/tex]
Next, we shall determine the volume of NaOH required to react with H₂SO₄. This can be obtained as follow:
Molarity of the base, NaOH [tex](M_{B}) = 0.505 M[/tex]
Volume of the acid, H₂SO₄ [tex](V_{A}) = 40 mL[/tex]
Molarity of the acid, H₂SO₄ [tex](M_{A}) = 0.505 M[/tex]
Volume of the base, NaOH [tex](V_{B})[/tex] =?[tex]\frac{M_{A} * V_{A}}{M_{B} * V_{B}} = \frac{n_{A}}{n_{B}}\\\\\frac{0.505 * 40}{0.505 *V_{B}} = \frac{1}{2}\\\\\frac{20.2}{0.505 *V_{B}} = \frac{1}{2}[/tex]
Cross multiply
[tex]0.505 * V_{B} = 20.2 * 2\\0.505 * V_{B} = 40.4[/tex]
Divide both side by 0.505
[tex]V_{B} = \frac{40.4}{0.505}\\\\V_{B} = 80 mL[/tex]
Finally, we shall convert 80 mL to dm³. This can be obtained as follow:
[tex]1000 mL = 1 dm^{3}\\\\Therefore,\\\\80 mL = \frac{80 mL * 1dm^{3}}{1000 mL}\\\\80 mL = 0.08dm^{3}[/tex]
Therefore, the volume of NaOH required is 0.08 dm³
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1. Based on the following balanced equation:
2 H2 + O2 + 2H2O
a. How many moles of O2 are required to react completely with 2.00 moles of H2?
1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
b. How many moles of H2O are produced after complete reaction of 2.00 moles of H2?
1.00 1.50
2.00 2.50 3.00 3.50 4.00 4.50 5.00
Answer:
a. 1 mole O2
b. 2 moles H2O
Explanation:
a. 2 moles H2 x [tex]\frac{1 mole O2}{2 moles H2}[/tex] = 1 mole O2
B. 2 moles H2 x [tex]\frac{2 moles H2O}{2 moles H2}[/tex] = 2 moles H20
Determine the percent water in CuSO4∙5H2O to three significant figures
Answer: 36.1%
Explanation: The molar mass of the complete molecule, CuSO4*5H2O is 249.6 g/mole. The molar mass of just the water (5H20) is 90 g/mole. Assume 1 mole of CuSO4*5H2O, the percent water would be:
90g H2O/249.6g CuSO4*5H2O = 0.361 or 36.1%
Ribbon diagrams show secondary structures and appear less detailed than other model types. In one to two sentences, give a reason that chemists would use ribbon diagrams. What type of information do they provide? (SHORT ANSWER)
Chemists prefer ribbon diagrams because they make the tertiary structure of the protein molecule easier to trace.
A protein molecule can be represented using several kinds of models. The ball and stick models which are common representations for other molecules can also be applied in the case of protein molecules.
However, the ribbon diagrams are preferred by chemists because they make the tertiary structure of the protein molecule easier to trace. Also, the ribbon diagram shows the overall path and organization of the protein backbone in the protein molecule.
This kind of structure was first introduced by Jane S. Richardson around 1981.
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Answer:
Ribbon diagrams look like the name they hold- ribbons. Therefore, they would be a good option if one were to trace or copy the diagram onto another document, etc. Also, they depict protein very well so if a chemist were studying different types of protein he/she would utilize a ribbon diagram.
Explanation:
What kind of chemical do we release when we help others?
Answer:
oxytocin is the answer
Explanation:
oxytocin
sheilding effect definition please
Answer:
give me brainliest
Explanation:
The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron. The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron.
Answer:
The shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud
Explanation:
i am not sure but i hope it will help you
e. How many grams of chlorophenol are there in 1.00 litre of a 47.0 mM solution? Show your calculations
in full.
(6 marks)
The mass of the chlorophenol is obtained from the number of moles and the volume of the solution.
Recal that;
Number of moles = concentration of solution * volume of solution
Concentration = 47.0 mM or 47.0 * 10^-3 M
Volume = 1.00 litre
Number of moles = 47.0 * 10^-3 M * 1.00 litre
Number of moles = 47.0 * 10^-3 moles
Also;
Number of moles = mass/molar mass
mass = Number of moles * molar mass
Mass = 47.0 * 10^-3 moles * 128.6 g/mol
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Mass = 6.0442 g
2. An Isotope of technetium, mixed with sulphur and colloidally dispersed in water, is frequentyused in diagnosing various medical conditions because it is readily taken up by various tissues Prior to excretion. Explain why this important
mixture is not a true solution.
Answer:
This is not a true solution because the colloidal dispersion is not completely homogeneous, and it does not have uniform properties throughout.
Explanation:
hope i helped
Write a balanced equation for the ionization of hydrochloric acid in water. Assume that hydronium ion is formed. (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
Answer:
HCl(g) + H₂O(l) -> Cl⁻(aq) + H₃O⁺(aq)
Explanation:
Usually when we have HCl in a lab, it's already dissolved in water. It's just HCl(aq). If we want to look at adding pure HCl, that'll be a gas. We should note that HCl is a strong acid that will break apart completely. One might not say that this is a chemical reaction so much as a dissociation. Strong acids are proton donors and form hydronium cations in aqueous solution.
The balanced equation for the ionization of hydrochloric acid (HCl) in water, forming hydronium ions (H₃O⁺) and chloride ions (Cl⁻) is:
HCl(aq) + H₂O(l) → H₃O+(aq) + Cl⁻(aq). The symbol for hydrochloric acid is HCl. H₂O stands for water. The hydronium ion, or H₃O+, is created when the acid HCl gives a proton (H+) to a water molecule.
The chloride ion, which is what's left of the HCl molecule after it's been ionized, is denoted by the symbol Cl-.
The reaction can move both in the forward (ionization) and backward (recombination) directions, according to the double arrow ().
Thus, The balanced equation for the ionization of hydrochloric acid (HCl) in water, forming hydronium ions (H₃O⁺) and chloride ions (Cl⁻).
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Please help thank you (20 points)
Answer:
Answer is b gravity only
Why is the half-life of a radioisotope important for radioactive dating?
A. The half-life forms a type of clock used to calculate time passed.
B. The half-life of a radioisotope tells how long ago the element was
formed.
C. The age of an object is equal to the radioisotope with the longest
half-life in it.
D. The half-life gives the period over which the radioisotope doesn't
change.
Answer:Dating Using Radioactive Decay
The best-known techniques for radioactive dating are radiocarbon dating, potassium-argon dating and uranium-lead dating.
After one half-life has elapsed, one half of the atoms of the nuclide in question will have decayed into a “daughter” nuclide.
Explanation:d
Axon diameters of cortico-cortical fibres in the human brain range from 0.16 um to 9 um in
length. Convert the length, 0.16 um, into meters using scientific notation. (Use the following
format: a x 10^b using the correct number of significant figures).
Type your answer and submit
1.6x10^-7
Х
Conversion from one unit to another requires the use of a conversion factor.
We are required in the problem to express our result in the form; a x 10^b
To convert from μm to m, the conversion factor to use is [tex]1 * 10^-6[/tex]
So;
1 μm = [tex]1 * 10^-6[/tex] m
0.16 μm = 0.16 μm * [tex]1 * 10^-6[/tex] m/1 μm
= [tex]1.60 * 10^-7[/tex] m
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explain what happens in terms of heat diffusion
Answer:
here is the answer
Explanation:
Diffusion is a process of passive transport in which molecules move from an area of higher concentration to one of lower concentration.
Which functional group does the molecule below have?
A. Ether
B. Amino
C. Carbonyl
D. Hydroxyl
SUBV
Answer:
Ether is the correct answer
Explanation:
It is based.
Shakespeare's A Midsummer Night's
Dream contains dialogue that is
meant to be performed. In what
narrative genre does this story fit?
A. historical fiction
B. mystery
C. play
write the chemical formula of the following compounds sodium sulfate magnesium chloride aluminum nitrate ammonium sulfate
Explanation:
Magnesium chloride = MgCl₂
aluminum nitrate= Al(NO₃)₃
ammonium sulfate=( NH₄)₂SO₄
a cyclist starts at rest and accelerates at 4m/s^2 south for 30s what is the cyclist final velocity?
Answer:
120
Explanation:
Please help due today
Answer:
OPTION B .
AS THEY WILL PRODUCE CO,CO2 WHICH WILL MAKE AIR POLLUED AS WELL AS RISE THE TEMPERATURE
If squares represent carbon and spheres represent chlorine make a representation of liquid CCl4
Answer:
Look in explanation
Explanation:
I have shown the Lewis diagram as well as the square and sphere representation.
Convert 355 km/s into m/ns.
Answer:
3.55e-7
Explanation: