The correct answer for the final volume read on the graduated cylinder = 4.72 ml ^3 .
density of lead is 11.4g/cm³,
quantity of water = 20.0 mL = 20 gram
sample of lead = 33.9 g
density = mass / volume
total mass = 20+ 33.9 = 53.9
volume = mass/ density
volume = 53.9/ 11.4
volume = 4.72 ml ^3
Graduated cylinders are long, slender vessels used to measure liquid volumes. They are not meant to be mixed, stirred, heated, or weighed. Graduated cylinders typically range in size from 5 mL to 500 mL. It is a tall narrow container with a volume scale used specifically for measuring liquids. These 100 mL glass graduated cylinders are used to accurately and easily measure and dilute liquids! These class-A, lab-quality graduates are built to deliver precise measurements while resisting breakage and a wide range of chemicals. A plastic volume marker is included.
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Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar. drag each item to the appropriate bin.
The classification is:
Basic: ArginineNeutral polar: GlutamineNeutral nonpolar: AlanineOrganic substances known as amino acids have both amino and carboxylic acid functional groups. Only 22 of the hundreds of amino acids found in nature are alpha amino acids, which are by far the most common and make up proteins. Only 22 alpha amino acids are found in the genetic code. Alpha-, beta-, gamma-, or delta-amino acids can be categorized according to where the main structural functional groups are located; further classifications relate to polarity, ionization, and the kind of side chain group (aliphatic, acyclic, aromatic, containing hydroxyl or sulfur, etc.). Amino acid residues are the second-largest component of human muscles and other tissues, behind water, in the form of proteins.
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1. 34g of CaCO3 was heated and decomposed completely. The reaction equation is shown below.
CaCO3(s) --> CaO(s) + CO2(g)
1.1 calculate the number of moles of CaCO3 that decomposed
1.2. Calculate the number of particles of CaO that can be produced
The number of particles produced is 8.1 * 10^21 particles.
What is number of particles?The equation of the reaction is; [tex]CaCO3(s)-- > CaO(s) + CO2(g)[/tex]. We can be able to obtain the number of moles of the calcium carbonate can be obtained from;
Mass = 1.34 g
Molar mass = 100g
Number of moles = 1.34 g/ 100g = 0.0134 moles
Thus, the number of moles of carbonate that decomposed is 0.0134 moles
Given that the reaction is 1:1 and there are 6.02 * 10^23 particles in 1 mole of CaO, the number of particles of CaO produced is;
0.0134 moles * 6.02 * 10^23 particles = 8.1 * 10^21 particles
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What is the state of hybridization of the central 0 atom in 03? describe the bonding in 03 in terms of delocalized molecular orbitals.
The hybridization of O in ozone molecule [tex]O_3[/tex] is [tex]sp^{2}[/tex]
The bond angle of ozone is 117.5° which is close to 120° , thus it show trigonal planar geometry and is [tex]sp^{2}[/tex] hybridized.
Bonding of oxygen in ozone can be stated as
Three sets of [tex]sp^{2}[/tex] hybrid orbital overlap to produce two [tex]O-O[/tex] σ bonds and five lone pair of electrons , two on both side oxygen atom and one pair on central atom.
The π bonding is formed by unhybridized [tex]2p_z[/tex] orbital on every oxygen atom . This π bonding is delocalized over all three oxygen atoms of ozone molecule.
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7. convert 22.7g to μg
The 22.7 g in μg ( micro gram ) is 22.7 × [tex]10^{-6}[/tex] .
We need to convert between units in order to ensure accuracy and prevent measurement misinterpretation.
For example , we do not measure a pencil's length in kilometers . In this situation , one must convert from kilometers ( km ) to centimeters ( cm ) . In most cases, multiplicative conversion factors are used to convert one unit to another of the same quantity .
Sometimes the units of measurement used may not correspond to the standards required for a particular process or application, as well as the measuring choice and convenience. The mass of object in micro gram unit is less than gram .
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What concentration gradients are established and maintained by the sodium-potassium exchange pump?.
The concentration of sodium is high outside the cell (extracellular fluid) and the concentration of potassium is high inside the cell (cytoplasm).
Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium (Na⁺/K⁺) pump).
The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.
The sodium and potassium cations move against the concentration gradients.
The sodium-potassium pump keeps a higher concentration of sodium extracellularly and a higher level of potassium intracellularly.
It is very important for many physiological processes in organism.
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What are the equilibrium partial pressures of coco and co2co2 if coco is the only gas present initially, at a partial pressure of 0.900 atmatm ?
CO CO2
Initial partial pressure 1 0.9
Equilibrium partial pressure 1 - x 0.9 + x
The equilibrium constant is Kp=PCO2/PCO.
Substitute values: 0.259=(0.9+x) / 1−x
Hence, x = . -0.509
Hence, the equilibrium partial pressures of CO and CO2 are 1.509 atm, -0.509 atm respectively.
The pressure that is exerted with the aid of one among the mixture of gases if it occupies the identical quantity on its very own is acknowledged as Partial pressure. Every gasoline exerts sure strain in a mixture.
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A graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL. What is the volume of the granite piece in mL?
The volume of the granite piece in milliliters if a graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL is 9.35mL.
How to calculate volume?Volume of a substance refers to the amount of that substance in a container. The volume is measured in litres (L), which can be converted to milliliters (mL) as follows:
1 Litre = 1000 milliliters
According to this question, a graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL.
This means that the volume the granite occupies is as follows:
Volume of granite = 19.45mL - 10.10mL = 9.35mL
Therefore, the volume of the granite piece in milliliters if a graduated cylinder is filled 10.10 mL with water and a piece of granite is placed in the cylinder, displacing the level to 19.45 mL is 9.35mL.
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Which combinations of single and double bonds are possible around a carbon atom?
Two Single and One Double Covalent Bond are possible around a carbon atom. After the hydrogen, helium, and oxygen, carbon is the fourth most prevalent element in the universe by mass and the fifteenth most abundant element in the crust of the Earth.
Carbon can be considered a common component of all known life due to its abundance, distinctive diversity of organic compounds Bond and exceptional capacity to build polymers at Earth's typical temperatures. After oxygen, it makes up around 18.5% of the total mass of the human body. The allotropic form of carbon exhibits a wide range of physical properties.
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6. the molecular weight of potassium chloride (kcl) is 74.55 g/mol. how many grams would you need for 650 ml of a 35 mm solution?
Mass of potassium chloride (KCl) is 1.7 grams.
M(KCl) = 74.55 g/mol; molar mass of potassium chloride
V(KCl) = 650 ml = 0.65 l; volume of potassium chloride solution
c(KCl) = 35 mM = 0.035 M; concentration of potassium chloride solution
m(KCl) = c(KCl) × V(KCl) × M(KCl)
m(KCl) = 0.035 M × 0.65 l × 74.55 g/mol
m(KCl) = 1.7 g; mass of potassium chloride
Potassium chloride (KCl) is a salt with ionic bond.
Molecular weight is the sum of the atomic weight values of the atoms in a molecule.
The concentration is the amount of solute that has been dissolved in a given amount solution.
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A solution with ph 4 has __________ the h concentration of a solution with ph 8.
A solution with ph 4 has 10000 times the h concentration of a solution with ph 8.
the solution, in chemistry, is a homogeneous mixture of two or more substances whose relative amounts can be varied continuously up to the so-called solubility limit. The term solution is usually applied to the liquid state of aggregation, but gaseous and solid solutions are also possible. Hypotonic, isotonic, and hypertonic solutions (tonic).
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. In solution, all components appear as a single phase.
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4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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Complete each row of the table below by filling in the missing prefix or missing exponent.
The metric prefixes are a follows;
1 ng = 10^-9 g1 dg = 10^-10 g1μg = 10^-6 g1Mg = 10^6 gWhat are metric prefixes?The SI unit is the international system for the measurement of quantities. We know that the SI system is based on the metric system. The metric system has the units meter, gram and seconds as part of it.
Sometimes we use prefixes to show the magnitude of quantities when we are using the metric system. Let us now try to find the correct prefix or power in the following cases;
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10. Stephen is worried he has a fever. His dad is a scientist though, and only has a thermometer
that measures in Kelvin, and it measures Stephen's temperature to be 312 Kelvin. If Stephen's
temperature is above 100°F, he isn't allowed to go to school. Can Stephen go to school today?
Select the correct mass for each of the samples described below.
8.32 × 10^20 formula units CaBr2
Answer:
Explanation:
To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.
3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g
8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g
1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g
You have just started brewing beer at home, and your first batch is now ready. You used the yeast saccharomyces cerevisia, which can perform both aerobic cellular respiration and fermentation. When you test the beer, you determine that the alcohol content is almost zero. What could have been present in the fermentation reaction apparatus that caused this problem?.
The oxygen present in the fermentation reaction apparatus has caused this problem.
The biological process that produces beer is fermentation. The yeast used to make beer, Saccharomyces cerevisiae, is capable of both fermentation and cellular respiration.
Saccharomyces cerevisiae would engage in aerobic cellular respiration in the presence of oxygen, converting glucose to carbon dioxide and producing energy. However, without oxygen, the yeast engages in fermentation and turns the glucose into ethanol (alcohol).
If the alcohol concentration is almost zero following the brewing method, oxygen may be present in the fermentation reaction apparatus. Thus, the Saccharomyces cerevisiae will perform aerobic cellular respiration rather than fermentation in the presence of oxygen.
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identify the properly written and balanced equation for the precipitation reaction between potassium phosphate and magnesium sulfate.
Balanced equation for the precipitation reaction between potassium phosphate and magnesium sulfate:
2K₃PO₄(aq) + 3MgSO₄ → Mg₃(PO₄)₂ + 3K₂SO₄
K₃PO₄ is the salt potassium phosphate, it is soluble in water
MgSO₄ is the salt magnesium sulfate
Mg₃(PO₄)₂ is the insoluble salt magnesium phosphate, it forms precipate in this reaction
K₂SO₄ is the salt potassium sulphate, it is soluble in water
In a precipitation reaction substances react to form one or more solid products (in this example magnesium phosphate).
This chemical reaction is double displacement reaction - cations and anions of the two reactants switch places and form two new compounds.
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What is reduced and what is oxidized in the reaction between a monosaccharide and a ferric ion?
In the reaction between a monosaccharide and a ferric ion, The carbonyl carbon is oxidized to a carboxyl group, the cupric ion is reduced.
Chemical reactions often involve color changes, temperature changes, gas evolution, or precipitate formation. Simple examples of everyday reactions are digestion, combustion, and cooking. The definition of reaction is a reaction. An example of a reaction is someone stopping their car at a stop sign. noun. response to stimuli.
The five basic types of chemical reactions are combination, decomposition, single exchange, double exchange, and combustion. By analyzing the reactants and products of a particular reaction, we can classify them into one of these categories. Some responses fit into multiple categories. It is modeled after the old Italian reaction, the French response, derived from the medieval Latin response (nominative to react). It is a noun of action formed in Late Latin from the past participle stem of the Latin reader.
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3. Which of the following is not an example of acceleration?
a. A car coming to a stop at a stoplight.
b. An avalanche increasing speed down the side of a mountain.
c. A cheetah running at a constant speed on a hunt.
d. A jet making a sharp turn in an air show.
Answer:
C: The Cheetah running at a constant speed.
Explanation:
Acceleration can be defined as:
1: A decrease in speed
2: An increase in speed
3: A change in direction.
The cheetah is the only object that does not meet any criteria for acceleration.
The example that is not an example of acceleration is a cheetah running at a constant speed on a hunt. The correct option is option (c).
Acceleration refers to a change in velocity, either in magnitude or direction. In the case of the cheetah running at a constant speed, there is no change in velocity, so there is no acceleration.
The cheetah maintains a steady speed, there is no change in velocity hence, it is not accelerating.
Therefore, a cheetah runs at a constant speed on a hunt. The correct option is option (c).
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Most elements are metals. What is a
physical property of metals?
A. They conduct heat.
B. They are man-made.
C. They float in water.
Answer:
A. They conduct heat.
Explanation:
A flask weighs 43.50 g when it is empty and 105.50
g when filled with water. when the same flask is
filled to the same volume with another liquid, the
mass is 96.75 g. what is the density of the second
liquid? (the density of water is 1 g/ml.)
The density of the second liquid is 0.4496.
What is density?"Density is the mass per unit volume." Density is known as a scalar quantity. It is denoted by a small d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.
The first density is
A flask weighs 43.50 g = M1
The mass is 96.75 g = M2
D1 = 1 g/ml
Density 2 = ?
The formula
M1 x D1 = M2 x D2
43.50 g x 1 g/ml = 96.75 g x D2
D2 = 43.50 g x 1 g/ml / 96.75 g = 0.4496.
D2 = 0.4496
Thus, the density of the second liquid is 0.4496.
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Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are?
Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reaction.
In chemical thermodynamics, an exergonic reaction is a chemical reaction where the conversion in the free energy is negative (there is a net allow to leave of free energy). This shows a unbidden reaction if the structure is closed and starting and final temperatures are the similar.
Formula of exergonic reaction :
∆G = Gproducts - Greactants
where
∆G = change in free energy
G-products = free energy of products
G-reactants = free energy of reactants
Now, it can understood that "Energy - requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reactions."
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Does the water testing protocol described in the lab manual involve serial dilution? justify your answer
Adding different amounts of contaminated water to each tube rather than diluting between tubes. Frequently, county health agencies will assist you with nitrate or bacteria testing. If not, you can ask a state-approved laboratory to test your water. Call the Safe Drinking Water Hotline at 800-426-4791 to locate one in your region.
Tests of the water's quality will reveal information on the condition of the river. The quality of the water might fluctuate over time, and this can be noticed by testing tubes it repeatedly. Temperature, pH, turbidity, salinity, nitrates, and phosphates are just a few of the variables that can be measured.
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2. What is the concentration in mol dm-3 of a solution which contains 3 moles of a given solute in 0.25dm³ (250cm³) of solution.
The concentration in mol dm-³ of a solution which contains 3 moles of a given solute in 0.25dm³ (250cm³) of solution is 12 mol/dm³.
How to calculate molarity?The concentration of a solution can be calculated by dividing the number of moles of the solution by its volume as per the following formula;
Concentration = moles ÷ volume
According to this question, a solution contains 3 moles of a given solute in 0.25dm³ (250cm³) of solution. The concentration of the solution can be calculated as follows:
Concentration = 3moles ÷ 0.25dm³
Concentration = 12 mol/dm³
Therefore, the concentration in mol dm-³ of a solution which contains 3 moles of a given solute in 0.25dm³ (250cm³) of solution is 12 mol/dm³.
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In the mass spectrum of pentane, the presence of a peak with m/z = 57 is most likely to the detection of:?
In the mass spectrum of pentane, the presence of a peak with m/z = 57 is most likely to the detection of a butyl radical cation.
What does the mass spectrum of pentane look like at the molecular level?Because all molecular ions fragment, a few compounds have mass spectra that lack a molecular ion peak. That is not a problem you will encounter at A'level. In the mass spectrum of pentane, for example, the heaviest ion has an m/z value of 72.
In pentane, what is the m/z of the fragment ion?Lines with m/z values one or two lower than one of the simple lines, for example, are frequently caused by the loss of one or more hydrogen atoms during the fragmentation process. The base peak (the tallest peak and thus the most common fragment ion) is at m/z = 57 this time. This, however, is not produced by the same ion as the pentane m/z value peak.
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What is the forward rate with continuous compounding for a three-month period starting in one year?
Answer:8.7%
Explanation:
The forward rate for a three-month period starting in one year is 11.36% per annum.
The forward rate for a specific time period represents the interest rate for borrowing or lending money during that period in the future.
Let's denote:
[tex]r_1[/tex] = Spot rate for one year (annual rate)
[tex]r_2[/tex] = Spot rate for one year and three months (annual rate)
The formula for the forward rate with continuous compounding is given by:
[tex]\[ F = \frac{e^{(r2 * t2)} - e^{(r1 * t1)}}{t2 - t1} \][/tex]
where:
F is the forward rate
[tex]t_1[/tex] is the starting time in years (one year)
[tex]t_2[/tex] is the ending time in years (one year and three months)
Substituting the value
[tex]\[ r_1 = 9.5\% \\r_1 = 0.095)[/tex]
[tex]r_2 = 0.096\\\[ t1 = 1 \text{ year} \][/tex]
[tex]\[ t2 = 1 + \frac{3}{12}[/tex] = 1.25 year back to the formula as
[tex]\[ F = \frac{e^{(0.096 * 1.25)} - e^{(0.095 * 1)}}{1.25 - 1} \][/tex]
[tex]\[ F = \frac{e^{0.12} - e^{0.095}}{0.25} \][/tex]
[tex]\[ F = \dfrac{1.1275 - 1.0991}{0.25} \][/tex]
[tex]\[ F= \dfrac{0.0284}{0.25} \][/tex]
F= 0.1136
Now, convert the forward rate back to percentage:
Forward rate (F) ≈ 0.1136 * 100% = 11.36%
So, the forward rate is 11.36% per annum.
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The missing table attached at the end.
What organelle surrounds and supports plant cells to give them support and structure?
Group of answer choices
Cell Wall
Nucleus
Cell membrane
Answer:Cell membrane
Explanation:Plant cells don’t have cell wall
Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? sr, te n, p in, sb k, be cr, kr
Nitrogen and phosphorous are pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties
Nitrogen and phosphorous are in same group VA group called pictogens and nitrogen family Nitrogen and phosphorous pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties Nitrogen and phosphorous have same valence electron that's why their physical and chemical properties are same
Phosphorus is a chemical element with an atomic number of 15, which means that the atomic structure includes 15 protons and 15 electrons. For Phosphorus, the chemical symbol is P the Phosphorus is also came under VA group called pictogens and nitrogen family thats why Nitrogen and Phosphorus are pair of elements expect to exhibit the greatest similarity in their physical and chemical properties.
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A ball-and-stick model of a molecule of formaldehyde, ch2o, is made from the following components: what do the sticks represent?
In chemistry, the ball-and-stick model is a molecular ideal of a chemical matter which is to expose both the three-dimensional position of the atoms and the bonds among them. The atoms are normally symbolise by spheres, join by rods which shows the bonds.
Formaldehyde forms formaldehyde structure bond it shares double bond with O2 atoms.
Formaldehyde also known as methanol .
Methanol is colourless.
It is flammable.
It is gas at room temperature.
Methanol having pungent odor and it is a volatile organic compounds.
It is made by the composition of Hydrogen, oxygen, and carbons.
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If the recommended daily allowance (RDA) for vitamin C is 60 mg per day and there are 70 mg of vitamin C per 100 g of orange, how many 3 oz. oranges would you have to eat each week to meet this requirement?
Please help, I'm terrible with Dimensional Analysis!!
The number of oranges to be eaten each week to meet the requirement is 7.
How are the RDA calculations done?
Mass of vitamin C is 70 mg.That is it is equal to 0.070 g.
as 1 mg=1×10[tex]^-3[/tex] g. And 60 mg is equal to 0.060 g according to this conversion.
The mass of orange in ounces is given as 3 oz.
As 1 oz=28.3495 g.Therefore,3 oz=(3×28.3495)g
which is equal to 85.045 g.
Given that 100 g orange has 0.070 g of vitamin C.Mass of vitamin C in 85.045 g of oranges is,
0.070/100×85.045=0.0595 g
Vitamin C consumed in 1 day is 0.060 g. Therefore in a week vitamin C consumed is 7×0.060=0.42 g.
To calculate the number of oranges to be eaten in a week it is calculated as,
Number of oranges=mass of vitamin C consumed in a week /mass of 3 oz oranges
Number of oranges=0.42 g/0.0595 g
=7.05≈7
Therefore,number of oranges to be eaten in a week are 7.
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The chemical released by the synaptic vesicles of neurons during synaptic transmission is called:___.
Answer:
a neurotransmitter
Explanation:
