The Confidence interval i.e, CI is calculated by the formula
CI= x± zs/ √N
where,
z= Confidence level value
s= standard deviation
N= Total number of measurements taken
So, we know that,
For 95% confidence level,
z=1.96
For 96% confidence level ,
z= 2.58
We know that,
s= 0.27 mgCu/mL
x= 7.91 mg Cu/ mL
A)
99%CI = 7.91± 2.58×0.27/√1
= 7.91± 0.70 mgCu/mL
95% CI= 7.91± 1.96×0.27/ √1
= 7.91± 0.53mgCu/mL
B)
99%CI = 7.91± 2.58×0.27/√4
= 7.91± 0.35 mgCu/mL
95% CI= 7.91± 1.96×0.27/ √4
= 7.91± 0.26mgCu/mL
C)
99%CI = 7.91± 2.58×0.27/√16
= 7.91± 0.17 mgCu/mL
95% CI= 7.91± 1.96×0.27/ √16
= 7.91± 0.13 mgCu/mL
The 99% and 95% confidence level interval for single analysis can be calculated, and also for the mean of 4 and 16 analysis by changing the value of N.
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Why are carbon atoms the building blocks for life?
their bonds are easily broken and repaired.
they have a negative charge to attract other atoms.
they can freely bond with any other atom.
thier bonds woth hydrogen are very stable.
Answer:
C: They can freely bond with any other atom.
Explanation:
It is said that Because each carbon is identical, they all have four valence electrons, so they can easily bond with other carbon atoms to form long chains or rings
Melting and boiling point of peppermint essential oil
Answer: Melting Point : 42 to 43 °C
Boiling Point : 215 to 216 °C
HELP ASAP, NO LINKS!!
how do you write 4.13 x 103 in decimal notation?
Answer:
4130
Explanation:
When numbers are multiplied by the 10 raised to a positive power, you want to move the decimal place to the right that many places.
As such, since 4.13 is being multiplied by 10³, you want to move the decimal place to the right 3 places. Keep in mind that there are technically 0's to the right of the "3".
The number in decimal notation is 4130.
Which option represents a group of elements with the same properties? (100 points for brainliest!!)
A.) neon, sodium, magnesiu
B.) calcium, potassium, scandium
C.) fluorine, bromine, chlorine
D.) arsenic, mercury, xenon
Fluorine,chlorine and bromine are elements with same properties.
What are the periodic trends in the periodic table?Properties such as the physical or chemical properties differ significantly across a period in a periodic table as electrons are added to the same valence shell.
Hence, for each successive element in a period there is one more electron in it's valence shell than the preceding element,as a result of which physical properties such as melting and boiling point differ significantly.
But for elements present in a group,as all elements in a group have same number of valence electrons ,hence they have same properties.
Among all the groups given,the group comprising of fluorine,chlorine and bromine have the same properties as they belong to the same group and have same number of valence electrons.
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1. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements is the best conductor of electricity?
A. Titanium **
B. Silicon
C. Oxygen
D. Argon
2. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements is the most reactive?
A. Titanium **
B. Silicon
C. Oxygen
D. Argon
3. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements has the highest electronegativity?
A. Titanium
B. Silicon
C. Oxygen **
D. Argon
From the periodic table as well as the patterns and trends on the table, the correct option are:
the best conductor of electricity is Titanium; option Athe most reactive element is oxygen; option Cthe elements that has the highest electronegativity is oxygen; option CWhat is the periodic trends in the periodic table?Periodic trends in the periodic table refers to the variation in character which is observed in the periodic table as one moves across the periodic table from left to right across a period or down a group in the periodic table.
The periodic trend observed is that reactivity of metals increase down a group and from right to left across a period.
For non-metals, reactivity of non-metals increase from down to top in a group and from left to right across a period across a period.
Considering the given questions;
1. From the periodic table as well as the patterns and trends on the table, the best conductor of electricity is Titanium since it is the only metal in the list.
2. The most reactive element is oxygen because it is a non-metal found to the top-left of the periodic table.
3. The elements that has the highest electronegativity is oxygen because it is a non-metal found to the top-left of the periodic table.
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Combustion reactions release large amounts of energy as heat
and/or light.
TRUE
FALSE
✔ Improve this
Answer:
True
Explanation:
A combustion reaction is when a substance reacts with oxygen and releases a huge amount of energy in the form of light and heat. A combustion reaction always has oxygen as one reactant.
If 0.1375 moles of a something weighs 58.61 g, what is the molar mass of it, in units of g/mol?
Answer:
0.1375 mol of it has a mass of 58.61 g.
One mole of it will have a mass of
0.1375 divide by 58.61
=0.00234601604g (molar mass of compound).
How much more mass does an alpha particle have compared to an electron?
Describe the nucleus in a eukaryotic cell.
Answer:
The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles.
What is an dependent variable? what a scientist changes in an experiment to test their hypothesis what a scientist changes in an experiment to test their hypothesis what happens when you do an experiment what happens when you do an experiment What you keep the same throughout all experimental groups What you keep the same throughout all experimental groups What scientist measure to see if it responded to a change What scientist measure to see if it responded to a change
Answer:
what a scientist changes in an experiment to
Explanation:
scientist measure to see if it responded to a change
An element consists of _____ _____ of _____.
Answer:
Particles of The Same Composition
Which of these is OK to wear in the lab?
Long, flowing, loose sleeves
Flip Flops
Bare midriff
Sandals
Long pants
Answer:
long pants
Explanation:
everything else is hazardous, and the long pants will protect your legs.
Which groups highlight nonmetals?
O A and B
O A and C
OB and D
OC and D
Answer:
1.) A and B
Explanation:
Elements in group A are nonmetals. Specifically, these elements are called noble gases.
Elements in group B are nonmetals.
Elements in group C are metalloids.
Elements in group D are metals.
Concentrated hydrochloric acid is approximately 12.2 M. If a student needs to prepare 250. mL of 0.500 M hydrochloric acid, what volume (mL) of concentrated acid is needed?
Chemical elements that do not exist in nature but can be created in the laboratory are known as synthetic elements. Flerovium, a synthetic element with atomic number 114, was first synthesized in 1998. A hypothetical mass spectrum for a sample of Fl, containing 10 atoms is shown below.
Using the information in the spectrum, calculate the average atomic mass of Fl in the sample in u.
Write your answer using four significant figures.
The relative atomic mass is 288.60
What is the atomic mass?The relative atomic mass is the sum of the products of the masses of the percentage abundance of each of the isotopes and the mass of that isotope. Recall that an element is composed of isotopes. These isotopes have the same atomic number but different mass numbers.
This implies that the isotopes have different numbers of neutrons. Let us now obtain the relative atomic mass of the element Flerovium.
Percentage abundance of isotope 1 = 2/10 * 100/1 = 20%
Percentage abundance of isotope 2 = 2/10 * 100/1 = 20%
Percentage abundance of isotope 3 = 6/10 * 100/1 = 60%
Then;
(0.2 * 287.2) + (0.2 * 288.2) + (0.6 * 289.2)
= 57.44 + 57.64 + 173.52
= 288.60
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.If the reaction of 125 g of C6H6O3 reacts in excess of oxygen (O2) and produces 51
g of H2O.
C6H6O3 + 3O2 → 6CO + 3H2O
a) How many grams of the excess reactant left over?
b) What is the percent yield?
If the reaction of 125 g of C₆H₆O₃ reacts in excess of oxygen (O₂) and produces 51. The calculations for the following are:
a. 51 grams.
b. 95.20 %
What is the percent yield?Percent yield is the calculation of the difference between actual and estimated yields.
C₆H₆O₃ + 3O₂ -------> 6CO + 3H₂O
Molar mass of C₆H₆O₃
6 x 12 + 6 x 1 + 3 x 16 = 72 + 6 + 48 = 126 g per mole.
So, 125 grams is 125 / 1 26 moles = 0.992 moles of C6H6O3.
From the equation, we can see that 1 part of C₆H₆O₃ reacts with 3 parts of Oxygen gas to give 6 parts of Carbon Monoxide and 3 parts of water.
So, 1 part = 0.992 moles
Hence, 3 parts of water is 0.992 x 3 = 2.976 moles of H2O.
Molar mass of H2O = 2 x 1 + 1 x 16 = 18 grams per mole.
So, 2.976 moles of H2O has a mass of 2.976 x 18 = 53.568 grams
So, the mass of water that should have been formed = 53.568 g
Thus, the grams of the excess reactant left over is 51 grams.
Percentage yield = (51 / 53.568) x 100 is 95.20 % (approx.)
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Answer:
If the reaction of 125g C6H6O3 REACTS in excess of O2and produced 51g of H2O what is the % yeild
Explanation:
Please help I need help right now please answer this and I will mark brainliest!!
Use the chemical equation to complete the activity.
2Cu+S→Cu2S
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.
Answer:
The scientist used the law of Conservation of matter.
Explanation:
This law states the matter cannot be created or destroyed. Matter can however be rearranged.
Answer: The scientist used the law of Conservation of matter.
Explanation:
This law states the matter cannot be created or destroyed. Matter can however be rearranged.
Explanation:
above
How are you going to apply your learning in naming compounds in our daily lives?
Answer:
Compounds in our daily life are salt, water, baking soda, sugar, graphite, etc.
Explanation:
We can use the knowledge of compounds to recognise different compounds such as listed above. We can realise what they're made up of and why they are compounds.
An experiment is repeated five times resulting in five replicate data points. The average deviation of the replicate data point is a measure of:
a Precision
b Accuracy
Given a 1 M stock of NaCl, how many mL of stock and how many mL of water you would mix to make 100 mL at 100 mM (0.1 M)??
1. The volume of the stock soluiton needed is 10 mL
2. The volume of water needed is 90 mL
Data obtained from the questionThe following data were obtained from the question:
Molarity of stock solution (M₁) = 1 MVolume of diluted solution (V₂) = 100 mL Molarity of diluted solution (M₂) = 0.1 M Volume of stock solution needed (V₁) =?Volume of stock solution needed (V₁) =?Volume of water needed =?1. How to determine the volume of the stock solution neededM₁V₁ = M₂V₂
1 × V₁ = 0.1 × 100
V₁ = 10 mL
Thus, the volume of the stock solution needed is 10 mL
2. How to determine the volume of water Volume of stock solution (V₁) = 10 mL Volume of diluted solution (V₂) = 100 mL Volume of water =?Volume of water = V₂ – V₁
Volume of water = 100 – 10
Volume of water = 90 mL
Thus, the volume of water needed is 90 mL
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Why is it important to distinguish science from pseudoscience?
It is fundamental to distinguish science from pseudoscience because science can help us to understand questions from the real world.
What is science?The term 'science' makes reference to all the body of knowledge obtained by using the scientific method, which is based on collecting empirical evidence that helps to test hypotheses or explanations (either confirm or reject them), that emerged by observing the real world.
Conversely, pseudoscience is not a discipline because it is not based on scientific evidence and therefore this type of data cannot be tested or verified, which is fundamental to progress in our understanding of the tangible characteristics of the real world.
In conclusion, it is important to distinguish science from pseudoscience because science can help us to understand questions from the real world and solve problems associated with our health and the environment.
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Which option is formed by the process of fusion in stars?
O compounds
Oelectrons
O quarks
Oelements
D. The option that is formed by the process of fusion in stars is elements.
How fusion in stars form elements
When the new star reaches a certain size, a process called nuclear fusion ignites, generating the star's vast energy.
The fusion process forces hydrogen atoms together, transforming them into heavier elements such as;
helium, carbon and oxygen.Thus, the option that is formed by the process of fusion in stars is elements.
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What is the volume in mL of a 1.11 carat diamond, given the density of diamond is 3.51 g/mL? (1 carat = 200 mg).
The volume of the 1.11 carat diamond is 63.2 mL.
What is the volume of the 1.11 carat diamond?The volume of the 1.1 carat diamond is determined as follows:
Density = mass/volumevolume = mass/densitydensity of diamond = 3.51 g/mL
mass of 1.11 carat diamond = 200 * 1.11
mass of 1.11 cart diamond = 222 g
volume of 1.11 carat diamond = 222 g/3.51 g/mL
volume of 1.11 carat diamond = 63.2 mL
In conclusion, the volume of the 1.11 carat diamond is obtained from the ratio of the mass and the density of diamond.
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When 5.6g of iron reacts with sulfur, the mass of iron sulfide is 8.8g. What mass of sulfur reacted?
Fe + S -> FeS
Which of the following protects Earth's atmosphere from solar wind
a. radiative zone
b. hydrogen atoms
c. convection currents
d. magnetosphere
The magnetosphere protects the earth's atmosphere from the solar wind.
Hence, option (d) is correct.
The magnetosphere is the area of spcae, around the earth which is controlled by the magnetic field of the earth.
The magnetosphere is created because of the earth's own magnetic field which is generated from the outer core.
The magnetosphere is made up of plasma having charged particles, mainly electrons and protons,
The magnetosphere stretches from the earth's core out into space. Here it meets solar winds or solar radiation emitted by the sun. The magnetosphere is acting as a shield and protects the earth from harmful solar radiation.
Hence, the magnetosphere protects the earth's atmosphere from the solar wind.
Therefore, option (d) is correct.
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Answer: The answer is magnetosphere
Explanation:
You will get it right.
Help me out with this chem problem please
The balanced equation reveals a 3:2 molar ratio between O2 and KCl. Therefore,
(32.0 g O2 g/1 mol O2) (3 mol O2/2 mol KCl) (1 mol KCl/74.5 g KCl) (40.6 g KCl) = 26.2 g O2
What temperature causes the breakdown of KClO3?When heated over 400 °C or in touch with strong acids, it decomposes, emitting poisonous gases such chlorine dioxide and chlorine fumes as well as oxygen. It breaks down into oxygen and perchlorate above the melting point.
Potassium chlorate (KClO3) breaks down into potassium chloride and oxygen gas when heated in the presence of a manganese dioxide catalyst.
The response provided in the query is a decomposition response. A decomposition reaction is one in which a chemical component is broken down into two or more new compounds by the action of heat, light, or electrical energy. Here, potassium chlorate breaks down to produce oxygen gas and potassium chloride.
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Solve the following problems.
7. If a graduated cylinder has 22 ml of water, and 6.4 ml are added, what is the total
volume of water in the cylinder?
The total volume of the cylinder is 28.4 ml.
Volume is a measurement of three-dimensional space that is occupied. Numerous imperial units or SI-derived units, such as the cubic metre and litre, are frequently used to quantify it numerically (such as the gallon, quart, and cubic inch).
Volume and length (cubed) have a symbiotic relationship. The volume of a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the amount of fluid (liquid or gas) that the container may hold. the following volume units:
• Metric units include litres, cubic centimetres, and cubic metres.
• US Standard: ounces, inches, feet, pints, and gallons
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Which element being oxidized in the following redox reaction 2 KCI3(g) = 2 KCI(g) + 3 O2(g)
Oxygen get oxidized in the following redox reaction 2KCIO₃(g) = 2 KCI(g) + 3O₂(g).
Redox is a kind of chemical response wherein the oxidation states of substrate exchange. Oxidation is the lack of electrons or growth inside the oxidation nation of a chemical or atoms inside it.
An oxidation-reduction reaction is a type of chemical reaction that includes a switch of electrons among two species. An oxidation-reduction response is any chemical response wherein the oxidation number of a molecule, atom, or ion modifications through gaining or dropping an electron.
The time period oxidation turned into used to explain reactions wherein a detail combines with oxygen. for instance, the oxidation of magnesium includes the chemical reaction between magnesium metal and oxygen to shape magnesium oxide.
Left hand side: K = +1; O = -2; Cl = +5
Right hand side: K = +1; Cl = -1; O = 0
here, the oxidation state of O changes from -2 to 0.
Therefore, the oxygen gets oxidized.
Disclaimer:- your question is incomplete, please see below for the complete question.
Which element is oxidized in the following redox reaction?
2KCIO₃(g) = 2 KCI(g) + 3O₂(g)
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How much water is in this cylinder?
Answer:~13mL
Explanation:
You have to read from the around the middle of the meniscus (which is the curve in the liquid's surface)
If 6.000 g of sugar is mixed with 9.000 g of water, what is the
concentration in weight percent?
The concentration in weight percent is 40%
Data obtained from the questionThe following data were obtained from the question:
Mass of sugar = 6.000 gMass of water = 9.000 gTotal mass = 6.000 + 9.000 = 15.000Concentration in weight percent = ?How to determine the concentration in weight percentConcentration in weight percent = (mass of sugar / total mass) × 100
Concentration in weight percent = (6.000 / 15.000) × 100
Concentration in weight percent = 0.4 × 100
Concentration in weight percent = 40%
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