Students conducted an analysis of baking soda in chemistry lab. During the activity, they had to calculate the mass in
grams of the baking soda being used. Some student data appears in the table. At the end of the activity, the teacher
told the students that the actual mass of baking soda was 0.45 grams. Which student had the most accurate and
precise data?
The student that had the most accurate and precise data is Mel (option D).
What is accuracy and precision?Accuracy is the degree of conformity of a measure to a true or standard value i.e. closeness to a standard or true value.
On the other hand, precision is the ability of a measurement to be reproduced consistently i.e. the closeness of measured values.
According to this question, students calculated the mass in grams of the baking soda being used.
It can be said that Mel, which measured the following values: 0.44g, 0.46g, 0.45g had the most accurate and precise value because they are both close to themselves and the true value.
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Answer:
D
Explanation:
Mel
A 35m x 15m swimming pool is filled with water to a depth of 3m. how much heat is required to raise the temperature of the water in the pool from 10c to 25c?
It avoids the need to make tedious, and uncertain, calculations to estimate the shell-side coefficient.
What is shell-side coefficient?In steady flow systems, tube-side heat transfer coefficients are capable of being greatly improved over flow at the same net flow Reynolds number. The Nusselt values converge, as shown in Figure 5.21, at higher Reynolds numbers, although operation at such high net flow Reynolds numbers would negate the benefits of adopting OBRs in the design. Nu is often increased by a factor of between 10 and 30 in the lower Re region.
Due to the improved radial transport exhibited by the vertical mixing patterns, this improvement has occurred. It is obvious that in an oscillating baffled system, heat transfer coefficients that are comparable to those of smooth-walled tubes under well-developed turbulence can be attained at significantly lower (net flow) Reynolds numbers.
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Which of following can form hydrogen bonds with water molecules?
(1) na
(2) ch 3cooh
(3) c 2h 6
(4) ch 3nh 2
Of the four species, only
CH₃COOH and CH₃NH₂ hydrogen bond
COOH can be formed via Water H and NH₂
Group. The species Na+ can be solvated with water through ionic dipole interactions rather than hydrogen bonding. As for C₂H₆ it can interact with water only by weak London dispersion forces
Hydrogen bonding refers to the attractive forces that occur between hydrogen atoms and highly electronegative atoms such as nitrogen, oxygen, and fluorine. These can occur intramolecularly or intermolecularly, depending on whether they occur in different molecules or in the same molecule. In general, hydrogen bonds are stronger than van der Waals forces, but weaker than ionic and covalent bonds.
Of the four species, only CH₃COOH and CH₃NH₂ hydrogen bond COOH can be formed via Water H and NH₂ Group. The species Na+ can be solvated with water through ionic dipole interactions rather than hydrogen bonding. As for
C₂H₆, it can interact with water only by weak London dispersion forces.
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Does vb theory indicate that the diatomic molecule he2 is a viable species? rationalize your answer
VB theory does not indicate that the diatomic molecule He₂ is a viable species.
Helium has atomic number 2, it has 2 protons and 2 electrons.
Electron configuration of helium atom: ₂He 1s².
Helim (He) is a noble gas.
Noble gases (group 18) are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.
Noble gases have very stable electron configuration and does not need to gain electrons, only when they gain energy.
Valence bond (VB) theory explains chemical bonding.
Helium atom is stable and does not form molecule.
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Why do industries use metallic compounds to make wires?
Select all that apply.
Responses
metallic compounds often have high luster
metallic compounds often have high luster
metallic compounds are ductile
metallic compounds are ductile
metallic compounds have high boiling points
metallic compounds have high boiling points
metallic compounds are good conductors of electricity
metallic compounds are good conductors of electricity
Answer:
metallic compounds are good conductors of electricity.
metallic compounds have high boiling points
Boron (B) is an element or a compound?
Answer:
Its a element
Explanation:
Boron is made of atoms.
Answer:
element is the answer for your question
Explanation:
because i took a test on this
What is the mass of 7.00 mol of hydrogen peroxide (h2o2)? 0.206 g 0.389 g 126 g 238 g
The mass of the hydrogen peroxide is 238 g.
Hydrogen peroxide at room temperature stays in liquid form. It has a bitter taste and is colorless. It is an important regent used in pharmaceutical and other industries. It also has medical use. It can be used as an antiseptic.
The number of miles in the hydrogen peroxide is n.
n = 7 mol
The molar mass of hydrogen peroxide is,
The molar mass of hydrogen peroxide = Molar mass of hydrogen + Molar mass of oxygen
= 2 × 1 + 2× 16
= 34 g/mole
The molar mass of hydrogen peroxide is 34 g/mole.
The mass of the hydrogen peroxide is,
[tex]Number \: of \: moles = \frac{ Mass }{ Molar \: mass}[/tex]
[tex]n = \frac{m}{M} [/tex]
m = n × M
m = 7 × 34
m = 238 g.
Therefore, the mass of the hydrogen peroxide is 238 g.
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What effect did the copper wire have on the candle flame? Propose a hypothesis.
Answer:
The flame of the candle looks to go out, but the candle continues to burn. In actuality, the copper wire coil is transferring heat away from the candle flame. The flame returns after the coil of wire is removed.
Explanation:
How does the idea of quantized energy apply to Bohr’s atomic model?
Answer:the electrons can possess only certain discrete energy values; values between those quantized values are not permitted.
Explanation:Both involve a relatively heavy nucleus with electrons moving around it, although strictly speaking, the Bohr model works only for one-electron atoms or ions.
When performing an extraction with between an aqueous solution and organic solution what determines which layer ends up the bottom layer in the separatory funnel ?.
When performing an extraction between an aqueous solution and an organic solution or organic compound, density will determine the layer ending up at the bottom of the separation funnel.
In chemistry, a separatory funnel is a kind of funnel that separates two immiscible liquids.
It is a transparent funnel and when two immiscible liquids i.e aqueous and organic solution is poured into it, and then allowed to stand, after a while a distinguished layer is formed setting them apart from each other.
Due to the difference in density, the extraction becomes easier as the aqueous layer has a low density and stays at the top while the organic layer is at the bottom.
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What mass of hydrogen is needed to produce 5.0 g of tungsten according to the equation: WO3 + 3 H2 --> 3 H2O + W
The mass of hydrogen that is needed to produce 5.0 g of tungsten is 0.0273 grams.
What is tungsten?Tungsten is a chemical element that is used with steel to make the steel strong.
The equation:
WO₃ + 3H₂ --> 3H₂O + W
Given, that the mass is 5.0 g of tungsten
The molar mass of tungsten is 183.84 g/mol
Moles = mass / molar mass
5.0 / 183.84 = 0.0271 moles
Then, the Mass of hydrogen
The molar mass of hydrogen is 1.00784
Moles of tungsten are 0.0271 moles
molar mass x moles
1.00784 x 0.0271 moles
0.0273
Thus, the mass of hydrogen needed is 0.0273 grams.
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Which occurs during a synthesis reaction?
●
A. Compounds break down into simpler products.
B. Two or more substances combine to form a more complex substance.
C. One element replaces another element in a compound.
D. Two elements in different compounds trade places.
Chemically speaking, how does applying hot dog mustard to a coin detect the presence of silver metal
Answer:
A black spot will remain on the silver coin, but not on the nonsilver coin. Mustard naturally contains sulfur compounds, and sul- fur reacts with silver to form a black precipi- tate of silver sulfide (Ag2S)
Explanation:
convert 3 hrs into sec by dimensional analysis
[tex]=3h\ x\ \frac{60 \min}{1h }\ x\ \frac{60\ sec}{1\ min}[/tex]
[tex]=10800\ sec[/tex]
Set up your equation so that your units cancel until you get to the unit you want. Hours and hours would cancel, and min and min would cancel, leaving you with sec which is the unit you want.
Remember: they can only cancel if one is on top and the other is on the bottom.
Answer:
1hr=60minutes
1min=60 seconds
then we have to convert 3hrs into seconds
now,
3*60*60=10,800
What will happen if i mix black coffee and white sugar together?
Explanation:
It drowns out some of the more delicate notes. It changes the flavour balance.
The boiling point of ethanol is 173.1°F. A lab group measures the boiling point as 185°F. What is the absolute error and the percent error?
Due to the hydrogen bonding between the molecules of ethanol and water, it is True.
Water and ethanol form weak hydrogen bonds with aromatic hydrogen atoms and strong hydrogen bonds with the hydroxyl, carbonyl, and ether groups in chrysin/galangin. Although less frequently than in water, ethanol molecules can form hydrogen bonds with one another. The fact that there is only one hydrogen with a significant Positive charge in each ethanol molecule limits the hydrogen bonding. Between adjoining hydrogen and oxygen atoms of nearby water molecules, hydrogen bonds are formed. A bond called a hydrogen bond is produced by the attraction between individual water molecules.
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The specific heat capacities of lead and magnesium are (in j/g-degree): 0.128 and 1.024. Calculate the molar heat capacities of these metals.
Given,
Specific heat capacity of lead = 0.128 J/g
Specific heat capacity of magnesium= 1.024 J/g
Molar heat capacity is the amount of heat needed to raise the temperature of 1 mole of a substance by 1 unit.
So,
For calculating molar heat capacity we need to multiply the specific heat capacities of the metals with their atomic masses.
Atomic mass of lead (Pb) = 207
Atomic mass of magnesium (Mg) = 24
∴ Molar heat capacity = specific heat capacity x atomic mass
Molar heat capacity of Pb=0.128 x 207 = 26.5 J
Molar heat capacity of magnesium (Mg) = 1.024 x 24 = 24.5
Hence , molar heat capacities of lead and magnesium are 26.5 and 25.5 Joules respectively.
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Molar heat capacities of lead and magnesium is 26.49 and 24.5 Joules, respectively.
Given,
Lead has a specific heat capacity of 0.128 J/g.
Magnesium has a specific heat capacity of 1.024 J/g.
The quantity of heat required to increase the temperature of 1 mole of a substance by 1 unit is known as its molar heat capacity.
So, We must multiply the specific heat capacities of the metals by their atomic masses in order to determine their molar heat capacities.
Lead (Pb) has an atomic mass of 207.
Magnesium (Mg) has an atomic mass of 24.
Specific heat capacity multiplied by atomic mass gives the molar heat capacity.
Pb has a 26.5 J molar heat capacity (0.128 x 207).
Magnesium's (Mg) molar heat capacity is equal to 1.024 x 24.
Thus, lead and magnesium have molar heat capacities of 26.49 and 24.5 Joules, respectively.
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What byproduct of fermentation induces the coagulation of casein into the cheese curd? select one:
a. carbon dioxide
b. lactic acid
c. ethyl alcohol
d. acetic acid
The byproduct of fermentation tha induces the coagulation of casein into the cheese curd is b. lactic acid.
Lactic acid causes the milk proteins casein to form into a cheese curd, because it increase acidity and the enzymes prefer for the coagulation.
Producing cheese curds is one of the first steps of makint a cheese.
Swiss cheese is a cheese made in Switzerland.
Swiss cheese is, usually, a semihard cheese made from cows milk with a characteristic holes.
Fermentation of milk is a metabolic process in which lactic acid (CH₃CHOHCOOH) and carbon dioxide are produced from sugar lactose:
C₅H₁₂O₆ → CH₃CHOHCOOH + C₂H₅OH + CO₂
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How many electrons would it take to equal the mass of a helium nucleus?
EXPRESS YOUR ANSWER USING TWO SIGNIFICANT FIGURES.
The electrons will take 7.3 times to be equal to the mass of the helium nucleus
How many electrons would it take to equal the mass of a helium nucleus?
If we want to calculate the number of electrons in the nucleus of the helium, then we have the formula for finding the number of electrons so by doing so we can get exactly the number of electrons.
The formula is that if we divide the total mass of the nucleus of the helium gas with the number of electronic mass so it will give us the number. So as a result it will take $7.28869 \times {10^{ - 59}}$ number of electrons to equal the mass of a helium nucleus.
The atomic mass of the Helium is 4.002602.
So we can conclude that the electrons will take 7.3 times to be equal to the mass of the helium nucleus.
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the small particles within the atom
are known as?
Answer:
molecules
Explanation:
hope i help :))
4. How many seconds in 1.0 yr?
Answer:
Around 31536000 seconds (depending on which days you want to exclude)
Explanation:
60 seconds in 1 minute
60 minutes in an hour
24 hours in 1 day
365 days in 1 year
60 * 60 * 24 * 365
A solution is prepared by dissolving 50.4 g sucrose (c12h22o11) in 0.332 kg of water. the final volume of the solution is 355 ml. for this solution, calculate the molarity.
The molarity of the sucrose solution is found to be 0.4146M
The term "molarity" (also known as "molar concentration," "amount concentration," or "substance concentration") refers to the amount of a substance per unit volume of the solution and is used to describe the concentration of a chemical substance, specifically a solute, in a solution.
Given:
Mass of sucrose, m = 50.4g
Volume of solution, v = 355ml = 0.355L
Molecular weight of sucrose = 342.3g/mol
To find:
Molarity, M = ?
Formula:
Molarity = amount of solute, n (moles) / volume of solution, v (L)
Calculations:
No. of moles of sucrose, n = mass of sucrose x (1 mole / molecular weight of sucrose)
n = 50.4 x (1/342.3)
n = 0.1472 moles
M = 0.1472 / 0.355
Molarity = 0.4146M
Result:
The sucrose solution has a molarity of 0.4146M.
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HELP.....................................................
Answer:
I believe that would be a liquid.
Explanation:
How to understand significant digits I know that leading zeros aren’t significant, but can someone explain more about significant digits i’m trying to understand it
Calculate the ph of a buffer solution obtained by dissolving 17.0 g of kh2po4(s) and 30.0 g of na2hpo4(s) in water and then diluting to 1.00 l.ph=
The ph of a buffer solution was obtained by dissolving 17.0 g of [tex]KH_{2} PO_{4}[/tex] and 30.0 g of [tex]Na_{2} HPO_{4}[/tex] in water and then diluting to 1.00L is 7.43.
We will apply the Henderson-Hasselblach equation to determine the pH:
pH= pKa + Log [A/AH]
when [tex]Na_{2} HPO_{4}[/tex] molar mass is 142 g/mol
A is the conjugate base [tex]HPO_{4} ^{-}[/tex] ions and as a result,
[tex][A]= \frac{30g}{142 g/mol}[/tex]
= 0.211 M
[tex]KH_{2} PO_{4}[/tex] has a molar mass of 136 g/mol.
Given that AH is the weak acid [tex]H_{2} PO_{4} ^{-}[/tex] ion,
[AH] = [tex]\frac{17.0 g}{136 g/mol.}[/tex]
= 0.125 M
and with [tex]H_{3} PO_{4}[/tex] having a pKa value of 7.21
then, substituting
∴ pH = 7.21 + log (0.211 / 0.125)
= 7.21 +0.227
=7.43
The pH of a buffer solution is 7.43.
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bro i need help asap
The densities of copper, silver, iron, and magnesium are 8.96,10.5,7.89,1.74g\slashcm3 in that order. you are given 5.00 grams of each metal. which one has the largest volume?
The element that has the largest volume is Magnesium
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d(copper)= 8.96 g/mld(silver)= 10.5 g/mld(iron)= 7.89 g/mld(magnesium )= 1.74 g/mlm = 5 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v(copper) = m/d(copper)
v(copper) = 5 g/ 8.96 g/ml
v(copper) = 0.5580 ml
v(silver) = m/d(silver)
v(silver) = 5 g/ 10.5 g/ml
v(silver) = 0.4762 ml
v(iron) = m/d(iron)
v(iron) = 5 g/ 7.89 g/ml
v(iron) = 0.6337 ml
v(magnesium ) = m/d(magnesium )
v(magnesium ) = 5 g/ 1.74 g/ml
v(magnesium ) = 2.8736 ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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The number of neutrons present in the nucleus of an average atom of any given element is best estimated by:_______-
The number of neutrons present in the nucleus of an average atom in any given element is best estimated by subtracting the number of protons from the mass number.
All atoms contain protons, neutrons and electrons, although the amount differs for each atom. Neutrons are located in the nucleus of each atom. They were first discovered by James Chadwick. They are also neutral and have no charge.
Apart from neutrons, positively charged protons are present in the nucleus. The number of protons is equal to the atomic number, usually denoted with the letter Z.
The mass number or atomic mass is the total mass of the atom. It is calculated by adding the number of protons to the number of neutrons. Electrons are really light and have negligible mass (about 1/1840 times the mass of a proton), so we don't add their masses when calculating mass number. So, to get the number of neutrons in an atom, subtract the number of protons from the mass number.
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The amount of energy that must be absorbed or lost to raise or lower the temperature of 1gram of liquid water by 1°c.
The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 gram of liquid water by 1°C is 1 calorie.
A calorie (cal), or a small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius. It is used to express the amount of energy released in a phase change or chemical reaction.
One small calorie is approximately 4.2 joules.
A calorie is a unit of energy.
A calorie was originally part of the metric system (SI), but now it is replaced with the joule (J).
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What is the purpose of adding water to a sample of vinegar used in the titration?
Water is added to vinegar, which already contains acetic acid, to dilute it while keeping the same number of moles in the acid solution.
This makes it easy to determine the titration's end point, which helps ensure appropriate titration and accurate results.
Since the number of acid moles in the solution does not vary with the addition of water, the additional volume caused by the addition of water is not taken into account in the calculations.
What is Titration?Titration is the process of adding one solution to another so that the reaction occurs under circumstances that allow the increased volume to be precisely measured. It is employed in quantitative analytical chemistry to ascertain an unidentified analyte's concentration. Titrations can entail different sorts of reactions as well as the acid-base reactions that are most frequently associated with them. Titration is often referred to as volumetric analysis or titrimetry. The term "analyte" or "titrand" refers to the chemical with an unknown concentration. The titrant or titrator is a standard solution of a reagent with a known concentration. The titration volume refers to the amount of titrant that reacts (often to generate a color change).To learn more about Titration, refer to:
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