Answer:
Not a diamond.
Explanation:
Since there's too much of a difference in this case it's possible that the mystery stone can be another precious stone but not diamond.
What happens when you increase the pressure on the following
reaction
2X(g) + 3Y(g) --> 5Z(g) + heat
Answer:
When pressure increases, there is no effect on the reaction because volume is constant.
The following flow diagram shows the various steps of elimination of waste through urine. There is an error in one of the steps.
A flow diagram is shown with three rectangular boxes. Each box from top to bottom is labeled Step 1, Step 2, Step 3. The text written inside the top rectangular box reads, Urine flows from the ureters to the kidneys. The text written inside the middle rectangular box reads, The Ureters carry urine to the urinary bladder. The text written inside the bottommost rectangular box reads, Urine leaves the body through urethra. The title of the flow diagram is Elimination of Waste.
What is the error in the diagram?
Answer:
The answer is A: step one should be urine flows from the kidneys to the ureters.
Explanation:
The kidney is an important organ which removes wastes and extra fluid from our body. Here the step 1 urine flows from the ureters to the kidneys is incorrect.
What are the components of urine?The formation of urine occurs through three steps. They are glomerular filtration, reabsorption and secretion. The urine comprises of 95% water and 5% wastes like the ions of sodium, potassium and calcium. The wastes like urea, ammonia and creatinine are also excreted through urine.
The urine flows from the kidneys through the ureters to the urinary bladder. It is a narrow tube which originates from the kidney and reaches the bladder. The ureter, urethra, urinary bladder and kidneys together forms urinary system.
The final tube which carries urine and leaves the body is called the urethra. The major function of urethra is to expel urine out of the body. In males it also help in the ejection of semen.
Thus the incorrect statement is step 1.
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Arrange the elements in order of increasing ionization energy. S,P,Cl
Answer:
P, Cl, S
hope that helps bby
<3
PLEASE HELP‼️‼️
A
B
C
D
What is the limiting reactant for the following reaction given we have 2.6 moles of HCI and 1.4 moles of
Ca(OH)2?
Reaction: 2HCI + Ca(OH)2 → 2H2O + CaCl2
Which of the following amino acids would be easiest to distinguish from the other three in a titration?
A. F - Phenylalanine.
B. K - Lysine.
C. V - Valine.
D. G - Glycine.
Answer:
B. K - Lysine.
Explanation:
Required
The easiest amino acid to distinguish
The 4 amino acids in the question can be grouped into 2. The groups are:
(1) Group I - Nonpolar amino acids and (2) Group IV - Basic amino acids
Three of the amino acids belong to group I while the last belongs to group IV.
The acids according to their categories are:
(1) Group I - Nonpolar amino acids:- Phenylalanine, Valine and Glycine
(2) Group IV - Basic amino acids:- Lysine
Because Lysine belongs to a different group different from the other three, it will be easily distinguished because it will exhibit a different property from the other three acids.
Choose and explain:
a. Strongest base to H (gas phase): NH3, CH3NH2, (CH3)2NH, (CH3)3N
b. Strongest base to BMe3: pyridine,
2-methylpyridine, 4-methylpyridine
Answer:
a) (CH3)3N
b) 4-methylpyridine
Explanation:
Let us bear in mind that the basicity of amines depend on;
1) the availability of the lone pair
2) the stability of the conjugate acid of the amine.
In the gaseous phase, the basicity of the amine strictly depends on the availability of the lone pair. The tertiary amine is better able to accept a proton in the gaseous phase since it is surrounded by three methyl groups having an electron pushing effect thereby reinforcing the lone pair on the nitrogen. This order is reversed in solution due to solvation.
Here again, the electron donation to the nitrogen bearing the lone pair is important. The 4-methylpyridine is more basic than 2-methylpyridine to BMe3 due to steric hindrance that hinders the bonding of 2-methylpyridine to BMe3.
Please select the word from the list that best fits the definition
Include skin, the respiratory system, the circulatory system, and inflammation
A. antibody
B. antigen
C.Natural Defences
D.active immunity
Answer:
I choose D option because may be it's correct
I believe it is c
Explanation:
because if u think about it and also do some research you would see that the circulatory system is a strong part of your body which can help u through natural defences if this sounds weird it's all in research but if it ain't c dont blame me for ruining your life- lol but yeah I think its c
The volume of a gas is 200.0 mL and the pressure is 2.00 atm. When the volume of the gas is 10 mL what is the pressure if the temperature remains the same?
Answer:
40 atm
Explanation:
Boyles law states that the pressure exerted on a gas is inversely proportional to the volume it occupies provided that the temperature is held constant. It is given by:
P ∝ 1/V
PV = constant
P₁V₁ = P₂V₂
Given that V₁ = initial volume = 200 ml, P₁ = initial pressure = 2 atm, V₂ = final volume = 10 ml, P₂ = final pressure. Hence:
2 atm * 200 ml = P₂ * 10 ml
P₂ = (2 atm * 200 ml) / 10 ml
P₂ = 40 atm
Consider the following equilibrium:
HC2O4- + HSO4- <—> H2C2O4 + SO42-
The order of Bronsted-Lowry acids and bases in the reaction is_________ .
Answer:
See explanation
Explanation:
According to Bronsted-Lowry definition of acids/bases, an acid is a proton donor while a base is a proton acceptor.
Hence, in a reaction, the species that donate protons are strong acids while the species that accept protons are strong bases.
Hence, HSO4- is a stronger acid than H2C2O4 and SO42- is a weaker base than HC2O4-
Note that the conjugate base of a strong acid is a weak base and vice versa.
Write balance complete molecular equation, ionic equation, and net ionic equations for the reactions that occur when each of the following solutions are mixed. Identify the spectator ion or ions in each reaction: a) Pb(NO3)2 and Na2S
Answer: The complete molecular, ionic, and net ionic equations are given below. The spectator ions are sodium and nitrate ions.
Explanation:
The ionic equation is defined as the equation in which all the substances that are strong electrolytes present in an aqueous state and are represented in the form of ions.
The net ionic equation is defined as the equations in which spectator ions are not included.
Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.
The balanced molecular equation for the reaction of lead (II) nitrate and sodium sulfide follows:
[tex]Pb(NO_3)_2(aq)+Na_2S(aq)\rightarrow PbS(s)+2NaNO_3(s)[/tex]
The ionic equation follows:
[tex]Pb^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+S^{2-}(aq)\rightarrow PbS(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
As sodium and nitrate ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]Pb^{2+}(aq)+S^{2-}(aq)\rightarrow PbS(s)[/tex]
Write the molecular formula for the compound that exhibits a molecular ion at M+ = 112.0499. Assume that C, H, N, and O might be present, and use the exact masses below:
Exact mass of carbon = 12.000
Exact mass of hydrogen = 1.0078
Exact mass of nitrogen = 14.003
Exact mass of oxygen = 15.995
The order of atoms should be carbon, then hydrogen, then the others in alphabetical order.
Answer:
C₆H₁₀NO
Explanation:
In order to arrive at a molecular formula we have to make some assumptions and they are
Assuming there is one ( 1 ) N and one ( 1 ) O that is present in the said molecule
Total mass = 29.998
next step: subtract the total mass from 112.0499 = 82.501
next : assume the presence of 6 carbon atoms in said molecule
Total mass = 6 * 12 = 72
Mass of Hydrogens = 82.501 - 72 = 10.501
∴ number of hydrogens = 10.501 / 1.0078 ≈ 10
Hence Total mass = 29.998 + 82.501 ≈ 112.0499
Finally Molecular formula = C₆H₁₀NO
The pressure on 150 mL of a gas is increased from 500 mm Hg to 700 mm Hg at constant temperature. What is the new volume of the gas?
A. 107 ml
B. 210 mL
C. 350 ml
D. 2333 mL
Answer:
Option A. 107 mL
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 150 mL
Initial pressure (P₁) = 500 mmHg
Final pressure (P₂) = 700 mmHg
Temperature = constant
Final volume (V₂) =?
The final volume of the gas can be obtained by using the Boyle's law equation as shown below:
P₁V₁ = P₂V₂
500 × 150 = 700 × V₂
75000 = 700 × V₂
Divide both side by 700
V₂ = 75000 / 700
V₂ = 107 mL
Therefore, the final volume of the gas is 107 mL.
How many moles of carbon dioxide, CO2, are in a 38.72 gram sample of the compound?
a
0.88 moles
b
0.88 grams
с
1442 moles
d
1442 grams
Answer:
A
Explanation: n = m/M = 38,72/ (M{CO2}) = 38,72 / 44
There are 0.88 moles of CO₂ in 38.72 gram sample of the compound.
What is a mole ?The mole is a unit for measuring the amount of a substance.
1 mol equals the number of particles in 12.0 g of carbon-12.
mol is the abbreviation used for mole.
It is given in the question 38.72 gram of CO₂ is present in the sample
Moles of CO₂ has to be calculated
1 mole = molar mass of a compound
Molar mass of CO₂ is 44g
44 gram of CO₂ makes 1 mole
So 38.72 gram will make 38.72*1 / 44
= 0.88 moles
Therefore ,There are 0.88 moles of CO₂ in 38.72 gram sample of the compound.
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What is the name of the functional group that is attached to this hydrocarbon?
H
H
alkyl halide
alcohol
carbonyl
ketone
Answer:
ketone
Explanation:
To make a 0.500 M solution, one could take 0.500 moles of solute and add Group of answer choices enough solvent to make 1.00 kg of solution. enough solvent to make 1.00 L of solution. 1.00 L of solvent. 1.00 kg of solvent.
Answer: The correct option is enough solvent to make 1.00 L of solution
Explanation:
A solution consists of solute and solvent. A solute is defined as the component present in a smaller proportion while the solvent is defined as the component that is present in a larger proportion.
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]Molarity=\frac{Moles}{Volume}[/tex] .......(1)
We are given:
Molarity of solution = 0.500 M
Moles of solute = 0.500 moles
Putting values in equation 1, we get:
[tex]0.500mol/L=\frac{0.500mol}{\text{Volume of solution}}\\\\\text{Volume of solution}=\frac{0.500mol}{0.500mol/L}=1.00L[/tex]
Hence, the correct option is enough solvent to make 1.00 L of solution
A sample of carbon tetrachloride (CCl4) contains 3 moles of the substance. How many atoms are there in the sample?
Answer:
1.806 × 10²⁴ atoms
Explanation:
To obtain the number of atoms a substance contain, we have to multiply the number of moles in that substance (n) by Avogadro's number, which is 6.02 × 10²³.
According to this question, a sample of carbon tetrachloride (CCl4) contains 3 moles of the substance. The number of atoms in CCl4 is calculated thus:
number of atoms = 3 × 6.02 × 10²³
number of atoms = 18.06 × 10²³
number of atoms = 1.806 × 10²⁴ atoms.
formula for tin (II) sulfide
Answer:
SnS
Explanation:
Tin(II) sulfide is a chemical compound of tin and sulfur. The chemical formula is SnS. Its natural occurrence concerns herzenbergite, a rare mineral.
Answer:
SnS
Explanation:
Tin, as it shows on the periodic table can have a +2 or +4 charge.
Sulfide is just Sulfur which has a -2 charge.
It tells us the charge of the tin in roman numerals. In this case (II) means two, so it is tin with a charge of two.
In order for these to balance each other, we are going to take one of the tin and one of the sulfur because it the +2 and -2 add to zero.
what is the formula of the conjugate base of N2H5..?
Answer:
[tex]N _{2} H _{3} {}^{3 + } [/tex]
171 g of sucrose ( MW of 342, melting point 186 oC, boiling point very high, and vapor pressure is negligible) is dissolved in one liter of water at 25 oC. At 25 oC the vapor pressure of water is 24 mmHg. Which value is closest to the vapor pressure (VP) of this solution at 25 oC?
The complete question is as follows: 171 g of sucrose ( MW of 342, melting point 186 oC, boiling point very high, and vapor pressure is negligible) is dissolved in one liter of water at 25 oC. At 25 oC the vapor pressure of water is 24 mmHg. Which value is closest to the vapor pressure (VP) of this solution at 25 oC?
a. 16mm Hg
b. 24mm Hg
c. 20mm Hg
d. 12mm Hg
Answer: The vapor pressure (VP) of this solution at [tex]25^{o}C[/tex] is closest to the value 24 mm Hg.
Explanation:
Given: Mass of sucrose = 171 g
Mass of water = 1 L = 1000 g
Vapor pressure of water = 24 mm Hg
As moles is the mass of substance divided by its molar mass. Hence, moles of water (molar mass = 18.02 g) is calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{1000 g}{18.02 g/mol}\\= 55.49 mol[/tex]
Similarly, moles of sucrose (molar mass = 342 g/mol) is as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{171 g}{342 g/mol}\\= 0.5 mol[/tex]
Total moles = 55.49 + 0.5 mol = 55.99 mol
Mole fraction of water is as follows.
[tex]Mole fraction = \frac{moles of water}{total moles}\\= \frac{55.49}{55.99}\\= 0.99[/tex]
Formula used to calculate vapor pressure of the solution is as follows.
[tex]P_{i} = P^{o}_{i} \times \chi_{i}[/tex]
where,
[tex]P_{i}[/tex] = vapor pressure of component i over the solution
[tex]P^{o}_{i}[/tex] = vapor pressure of pure component i
[tex]\chi_{i}[/tex] = mole fraction of i
Substitute the values into above formula to calculate vapor pressure of water as follows.
[tex]P_{i} = P^{o}_{i} \times \chi_{i}\\= 24 mm Hg \times 0.99\\= 23.76 \\or 24 mm Hg\\[/tex]
Thus, we can conclude that the vapor pressure (VP) of this solution at [tex]25^{o}C[/tex] is closest to the value 24 mm Hg.
Is it possible to boil eggs without fire?
Answer:
yeah: just boil it in a electric kettle.
A gaseous element that is a poor conductor of electricity,
and does not react with other elements is classified as a
Answer:
Nonmetals are elements that generally cannot conduct electricity. They are the second largest class of elements after metals. Examples of nonmetals include hydrogen, carbon, chlorine, and helium. Properties of nonmetals include a relatively low boiling point, so many nonmetals are gases.
It would be considered a Nonmetal
Explanation:
Elements beyond iron are not formed by a-particle capture. It is believed they are formed by neutron capture. Once the nucleus gets enough neutrons, one neutron converts to an electron and a proton. Show how you can make zinc from copper by neutron capture.
Answer: The equation is [tex]_{29}^{63}\textrm{Cu}\rightarrow _{30}^{63}\textrm{Zn}+_{-1}^0e[/tex]
Explanation:
Neutron capture is a process where a neutron is converted into a proton and an electron. The released particle is known as beta particle and it carries a charge of -1 units and has a mass of 0 units. It is also known as an electron. The general equation for this process is:
[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+ _{-1}^0\e[/tex]
The nuclear equation for the formation of zinc via neutron capture of copper follows:
[tex]_{29}^{63}\textrm{Cu}\rightarrow _{30}^{63}\textrm{Zn}+_{-1}^0e[/tex]
A rod “X”, has a positive charge of 5. An otherwise identical rod, “Y”, has a negative charge of 12.
The rods are touched together and then separated.
a) When they touched, what particles moved between them?
b) Did the particles move from “X” to “Y” or from “Y” to “X”.
Answer:
a) electrons
b) from Y to X
Explanation:
positive protons are the cores of atoms in relative to electrons very, very heavy.
the outer electrons of atoms can move, under certain conditions, away from the atom, leaving it electrically unbalanced -> positively charged
there can also be a surplus of electrons on many surfaces, leading to a static negative charge. you know this when you are charged and you discharge with an object or another person, electrically balancing the two bodies charge.
electrons are also much smaller. they are the "things" to move, let it be trough the air or trough a wire, while the heavy protons will stay in place (unless the materials is melted of course, extreme heat brakes the bounds between atoms relatively well)
Consider the following reaction: CrCl3(s) KCl(s) 2H2SO4(l) - KCr(SO4)2(s) 4HCl(g) green white colorless purple colorless solid solid liquid solid gas When the green solid is mixed with the white solid and the colorless liquid is added, the mixture starts to bubble and fume. When all action has stopped, a wet purple solid containing solid white specks remains. Which substance is the limiting reactant
Answer:
The limiting reactant is CrCl3
Explanation:
In a reaction, the limiting reactant is that reactant which is present in a quantity that is less than the quantity required.
The amount of product formed depends on the concentration of the limiting reactant.
The excess reactant still remains even after the reaction is completed.
Since the purple product still had some white spots, then KCl was definitely in excess.
If that is the case, then CrCl3 is the limiting reactant.
Convert the following with the correct number of significant figures:
1.78kg to ug
O 1.78 x 108 mg
O 1.8 x 10' ug
Ο 1.78 με
Ο 0.000000178 με
O 1.78 x 10 g
Answer:
1.78 × 10⁹ μg
Explanation:
We have to convert 1.78 kg to μg.
Step 1: Convert 1.78 kilograms to grams
We will use the conversion factor 1 kg = 10³ g.
1.78 kg × 10³ g/1 kg = 1.78 × 10³ g
Step 2: Convert 1.78 × 10³ grams to micrograms
We will use the conversion factor 1 g = 10⁶ μg.
1.78 × 10³ g × 10⁶ μg/1 g = 1.78 × 10⁹ μg
gress.
Newton's third law of motion
Is the following statement true or false?
When a large truck pushes a small car with a given force, the small car is applying an equal and opposite
force on the truck.
Choose 1 answer:
True
False
Answer:
true
Explanation:
the small car also has gravity making it heavy
Which type of scientist would most likely investigate how to synthesize
materials found in plants?
O A. A geologist
O B. A biologist
O C. A chemist
OD. A physicist
Answer:
Biologist
Explanation:
Not sure, but I think that is right
Name the following ketone:
Determine whether each of the amino acids is polar, nonpolar, positively charged, or negatively charged at pH 7. gln
Answer:
Serine (Ser), threonine (Thr), cysteine (Cys), asparagine (Asn), glutamine (Gln), and tyrosine (Tyr) are the amino acids
Explanation:
Serine (Ser), threonine (Thr), cysteine (Cys), asparagine (Asn), glutamine (Gln), and tyrosine (Tyr) are the amino acids that are polar in nature while on the other hand, alanine, cysteine, glycine, isoleucine, leucine, methionine, phenylalanine, proline, tryptophan, tyrosine and valine are the amino acids that are non-polar. Arginine, Cysteine and Histidine are the amino acids having positively charged whereas, aspartic acid and glutamic acid are the amino acid having negatively charged.
