The number of significant figures in a result simply refers to the number of figures that are known with certainty. Here,
1000000 is 999999 rounded to three significant figures.
What is the best way to round a number to three significant figures?Significant figures are digits of value that have meaning in terms of measurement resolution. In chemistry, they are also known as significant figures. All of the experimental measurements are subject to some degree of uncertainty.The number of significant figures in a result is simply the number of figures that are reliably known.A number is rounded to three significant figures in the same way that it is rounded to three decimal places. For three digits, we start counting from the first non-zero digit. The final digit is then rounded. We use zeros to fill in any remaining spaces to the right of the decimal point.To learn more about significant figures refer to :
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A car was purchased in 2010 for $20,000. The car is depreciating by 15% each year. How much would the car be worth in 2020? What value do you use for T
The value of a car that was purchased in 2010 for $20,000 which is depreciating in value by 15% each year is $3937.49.
What will be the value of the car after 10 years if it depreciates by 15% every year?The value of the car will be found using the exponential decay model.
The formula of the exponential decay model is given as follows:
y = a (1 - r)ˣ
where;
y = the amount remaining
a = initial amount
r = decay rate
x = time period of decay
In the question above, a car was bought for $20000 in 2010.
The value of the car decays exponentially at a rate of 15% each year.
The time period between 2010 and 2020 is 10 years.
Considering the data given about the car:
a = $20000
r = 15% or 0.15
x = 10
Substituting the values in the decay formula:
y = 20000 (1 - 0.15)¹⁰
y = 20000 (0.85)¹⁰
y = $3937.49
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what is a solid with the following characteristic property:
a density of 0.56g/cm³
Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .
Lithium , chemical symbol Li is the alkali group metal. lithium is the lightest solid element. lithium has melting point of 180.54 °C and having boiling point of 1342 °C. lithium belongs to group I(a) having valency 1. under normal condition , lithium is the least dense solid element having density 0.56 g/cm³ . lithium has several industrial uses like heat resistant glass lithium ion batteries , lithium is so light ,it can float on water.
Thus, Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .
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for the gas phase decomposition of ethyl chloroformate, the rate constant has been determined at several temperatures. when in is plotted against the reciprocal of the kelvin temperature, the resulting linear plot has a slope of k and a -intercept of 24.6. the activation energy for the gas phase decomposition of ethyl chloroformate is kj/mol. submit answer
The reaction rate constant and activation energy are connected through the Arrhenius equation. By using the logarithmic form of that equation, we can calculate the activation energy of 0.2045 kJ/mol.
According to Arrhenius equation, activation energy and rate constant are connected in the following way:
[tex]k = Ae^{\frac{-E_{a} }{RT} }[/tex]
Ea is the activation energy, k is the rate constant, R is the universal gas constant (8.314 J/Kmol) and T is absolute temperature (in Kelvins). This expression can be transformed so that it is easier to determine Ea:
[tex]lnk = \frac{-Ea}{R}*\frac{1}{T}[/tex]
When lnk is plotted as a function of 1/T, the slope coefficient is equal to -Ea/R. This means that:
-24.6 K = -Ea/R ⇒ Ea = 24.6 K * R = 24.6 K * 8.314 J/Kmol = 204.5 J/mol = 0.2045 kJ/mol
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An object travels at 65 mph west for 2 hours then changes direction and travels 50 mph east for three hours. Did this object accelerate?
No because it's travelling at a constant velocity in both scenarios and there's no particular direction in which the rate of change of velocity is changing.
What happens in the process of beta decay?
Answer:
a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +.
Explanation:
In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n. Both reactions occur because in different regions of the Chart of the Nuclides, one or the other will move the product closer to the region of stability. These particular reactions take place because conservation laws are obeyed. Electric charge conservation requires that if an electrically neutral neutron becomes a positively charged proton, an electrically negative particle (in this case, an electron) must also be produced. Similarly, conservation of lepton number requires that if a neutron (lepton number = 0) decays into a proton (lepton number = 0) and an electron (lepton number = 1), a particle with a lepton number of -1 (in this case an antineutrino) must also be produced. The leptons emitted in beta decay did not exist in the nucleus before the decay–they are created at the instant of the decay.
How to assure our bottled water is free of Calcium,
Magnesium and Lead ions.
Answer:
t can be removed by using a water softener
Explanation:
You need to use your separatory funnel for an extraction, but you notice that there is some residual water in it from when it was washed during the previous lab period. What should you do?.
Depending on the extraction you are performing and the way it was washed, the separatory funnel can either be dried, washed again, or just used as is.
In an ideal case, the separatory funnel was thoroughly washed and rinsed with deionized water. Because most liquid-liquid extractions include an aqueous layer, the small amount of water already present in the funnel will not have any negative impact on the results of your experiment, and the funnel can be used as it is.
If you are not sure whether the funnel was properly washed, you can quickly wash it yourself using detergent and water, rinse it thoroughly with deionized water, and then use it.
Finally, you can rinse the funnel with some ethanol (or, if possible, acetone), which will pick up water and wash away any organic impurities that might be present, and then dry it with a hair dryer. Be careful to wait for the funnel to cool after drying because many organic solvents have low boiling points and might cause a problem if poured into a hot funnel.
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According to the Law of Conservation of Matter, what happens to atoms during a chemical reaction?
1. More atoms are produced to form new substances.
2. Nothing; they stay the same.
3. The atoms are rearranged to form new substances.
4. Atoms are converted into energy during the chemical reaction.
Answer: 3. The atoms are rearranged to form new substances.
According to law of conservation of matter, atoms are rearranged to form new substances in a chemical reaction.
What is law of conservation of matter?According to law of conservation of matter, it is evident that matter can be neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of matter and energy are related as matter possesses mass and mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of matter is widely used in field of chemistry and fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of matter and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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N a p h, f a d h, and h 2 o enter the electron transport chain. o 2 and 32 a t p exit the electron transport chain. which change will correct this model of the electron transport chain? switch naph and 32 atp. switch fadh and 32 atp. switch h2o and o2. switch naph and o2.
The change will correctly effect the model of the electron transport system above simply is to switch H₂O and O₂ ( Water and oxygen ).
The correct answer choice is option c.
Switching water and oxygen molecules to effect a change where NAPH, FADH, and H₂O enter the electron transport chain.It happens that oxygen react with 2 different electrons from the transport chain and 2 hydrogen in order to produce water molecules in the process.
Electron transport chain simply refers to a protein complex redox reactions which result in the production of ATP molecules. In this whole process of forming ATP, the electrons in the chain carried by the NADH, FADH2 and H+· are transferred to oxygen atom.
In conclusion, for an effective change to occur in the above electron transport system, there needs to be a switch of water and oxygen molecules
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Answer :Switch H2O and O2.
Explanation: edgenuie 2022-23
a mixture of argon and xenon gases is maintained in a 7.66 l flask at a pressure of 2.44 atm and a temperature of 86 °c. if the gas mixture contains 17.0 grams of argon, the number of grams of xenon in the mixture is
By using the general gas equation, the mass of Xenon in the mixture is found to be 27.44g.
The ideal gas law, also known as the general gas equation, says that the product of the pressure and volume of one gram of an ideal gas is equal to the result of the universal gas constant and the absolute temperature of the gas.
PV = nRT denotes the general gas equation. In this equation, the letters P, V, n, R, T stand for the pressure of the ideal gas, the volume of the ideal gas, the total amount of the ideal gas given in moles, the universal gas constant and the temperature, respectively.
The general gas equation states that one mole of an ideal gas may occupy a volume of 22.414 liters under standard circumstances, which are a pressure of 101,325 Pa / 1atm and a temperature of 273.15 K or 0°C.
Given:
Pressure, P = 2.44atm
Temperature, T = 86+273 = 359K
Volume, V = 7.66L
To find:
Mass of Xe = ?
Formula:
PV = nRT
Calculations:
Let total no. of moles of Ar and Xe = y
n = PV/RT
n = 2.44 x 7.66 / (0.0821 x 359) = 0.634mol
No. of moles of Argon (yAr) = 17/40 = 0.425mol
y = yAr + yXe
0.634 = 0.425 + yXe
yXe = 0.634 - 0.425
yXe = 0.209mol
Mass of Xe = no. of moles x gram atomic mass
Mass of Xe = 0.209 x 131.293 = 27.44g
Result:
27.44g Xenon is present in the given Argon and Xenon mixture.
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HELP BRIANLIEST AND 30 POINTS
If the density of an object is greater than 1 g/ml, what does that mean?
Group of answer choices
The object is heavier than gold
The object will float in water
The object will either sink or float in water depending on its size
The object will sink in water
If the density of an object is greater than 1 g/mL, the object will sink in water (option D).
What is density?Density of a substance can be defined as the measure of the mass of matter in the substance contained by a unit volume.
The density of a substance is a determinant of whether or not the substance will float or sink in a liquid substance like water.
This means that an object will float in water if it has a density less than water but will sink if it has a density higher than water.
Since the density of water is 1g/mL, therefore, an object with density greater than 1g/mL will sink in water.
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which of these sets of elements has similar properties? responses strontium, magnesium, calcium, beryllium strontium, magnesium, calcium, beryllium chromium, magnesium, iron, cobalt chromium, magnesium, iron, cobalt hydrogen, helium, neon hydrogen, helium, neon oxygen, nitrogen, carbon
Why are sodium (Na) and potassium (K) in the same group on the periodic table?
A They are both hard and brittle.
B They have similar reactivity.
C They are both colorless.
D They have similar atomic weights.
Sodium (Na) and potassium (K) in the same group on the periodic table because of option B They have similar reactivity.
The periodic table, also called the periodic table of the factors, is a tabular show of the chemical elements. it is broadly used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.
Lithium, sodium, and potassium have the same wide variety of valence electrons i.e. 1, for this reason, they belong to the same organization. The institution is referred to as the alkali metals group because these kinds of elements shape oxides that dissolve in water to form alkali.
Potassium is observed clearly in lots of meals and as a complement. Its major position within the body is to assist maintain ordinary levels of fluid inside our cells. Sodium, its counterpart, keeps regular fluid ranges outdoors of cells. Potassium also helps muscles to settle and supports normal blood pressure.
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Which statement describes the relationship of resistance and current?
Resistance is directly proportional to current because R = V over I..
Resistance is inversely proportional to current because R = .
Resistance is directly proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI. Option D.
If you increase the applied voltage and don't change the resistance, the current will also increase. The higher the resistance the more strongly the electron interacts with the resistance, slowing it down. Electrons repel each other, so even if more electrons pass through the resistor this cannot be counteracted.
As resistance increases current decreases and all other factors remain constant. Materials with low resistance, such as metals, are called electrical conductors and allow current to flow easily. High-resistance materials such as plastics are called electrical insulators. Current is inversely proportional to resistance. If I fix the voltage across a variable resistor the current that flows is inversely proportional to the resistance.
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Answer:
B) Resistance is inversely proportional to current because R = V/I
Explanation:
Using a reactivity series, show which reactions can occur: (YES or NO)
1. Na replaces K?
2. Co replaces Cu?
3. Zn replaces Zn2+?
4. Ni replaces Ba?
1. Na cannot replace K
2. Co will replace Cu
3. Zn cannot replace itself
4. Ni cannot replace Ba
Cation reactivity seriesThe reactivity series is a table showing how reactive elements. The reactiveness could be in descending or ascending order.
Reactivity series exist for both cations and anions.
In this case, we are dealing with cations. The reactivity series for cations is in the attached image.
The following can be observed from the table:
K is above NaCo is above CuBa is above NiAs a rule of thumb, cations at the lower part of the table cannot displace cations at the upper part during reactions.
Thus:
Na (sodium) cannot replace K (potassium)Co (cobalt) will replace Cu (copper)Zn cannot replace itself. Zn and Zn2+ are the same.Ni cannot replace Ba.More on the reactivity series can be found here: https://brainly.com/question/14652325
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3. Explain why it was significant that large numbers of other frogs and toads became extinct at the same time the golden toads disappeared.
What is the measurement of the letter I when using appropriate prefix units?
A metric prefix is a unit prefix used to denote a multiple or submultiple of a basic unit of measure. Today's metric prefixes are all decadic. Each prefix has its own distinctive sign, which is added before any unit symbol.
Since humans have been measuring things for thousands of years, the units we use to represent those measurements have changed. Numerous units are now available to describe physical amounts.
Longitude, for instance, can be expressed in terms of the foot, metre, fathom, chain, parsec, league, and so on.
In the SI, multiples and subdivisions of any unit can be designated by combining the prefixes deka, hecto, and kilo, which represent 10, 100, and 1000 respectively, and deci, centi, and milli, which represent correspondingly, with the name of the unit.
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Andrea's teacher wrote a note on her lab report stating that though her data was precise, it was not accurate. What could Andrea have done wrong?
Group of answer choices
Written the data down in her notebook incorrectly
Not properly calibrated her instruments
She didn't do anything wrong; experiments do not always turn out the way we expect.
She could have made several random errors.
If Andrea's teacher wrote a note on her lab report stating that though her data was precise, it was not accurate, then Andrea she didn't properly calibrate her instruments (Option b).
What are precision and accuracy?The term precision indicated that the measurement was correctly recorded in the experimental procedure, while accuracy refers to this measurement is factually correct. For example, when measuring temperature, it may be deviated from the correct temperature value due to failure of calibration in instrumentation.
Therefore, we can conclude that precision and accuracy are not identical and we can take precise measurements that are not accurate.
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Why does a solute depress the freezing point?
A) because the solute has bigger molecules than the solvent
B) because the solute disrupts crystal formation by the solvent
C) because the solute is colder than the solvent
D) because the solute tends to sink to the bottom of the solution
Answer: Option (B) is the correct answer.
Explanation: Freezing point depression is defined as the decrease in temperature of freezing of a solvent when a non-volatile solute is added into it.
This decrease in temperature arises because addition of solute particles into the solvent tend to disrupt the crystal formation of the solvents.
As a result, particles does not come closer to each other. Hence, we need to provide more lower temperature due to which there will be formation of crystal lattice in order to form the solid.
Thus, we can conclude that a solute depress the freezing point because the solute disrupts crystal formation by the solvent.
What evidence might you need in order to explain the bands of different colors
Evidence might you need in order to explain the bands of different colors are because of electromagnetic radiations
The color of the light that correspond to the narrow wavelength band are the pure spectral colors
Here each different wavelength and frequency of visible light correspond to the different color so that spectrum appear as a band of color ranging from violet at the shorter wavelength and full spectrum of visible light travel through prism and wavelength separates into the colors of the rainbows because each colors has its own frequency and different wavelength and spectrophotometer is the important tool to study the colors of band
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Full Tablet................................
The reaction rate with mass of the tablet being 1000 mg and volume of water 0.200 L is
(i) If Reaction time is 34.5 sec – 145 mg / L / sec is the reaction rate
(ii) If Reaction time is 28.9 sec – 173 mg / L / sec is the reaction rate
(iii) If Reaction time is 23.1 sec – 216 mg / L / sec is the reaction rate
Given that, Mass of tablet = 1000 mg
Volume of water = 0.200 L
We need to find the reaction rate
We know that, Reaction rate = [tex]\frac{mass of tablet / volume of water}{reaction time}[/tex]
(i) Reaction rate if reaction time is 34.5 sec = [tex]\frac{1000 / 0.200}{34.5}[/tex] = 145 mg / L / sec
(ii) Reaction rate if reaction time is 28.9 sec = [tex]\frac{1000/0.200}{28.9}[/tex] = 173 mg / L / sec
(iii) Reaction rate if reaction time is 23.1 sec = [tex]\frac{1000/0.200}{23.1}[/tex] = 216 mg / L / sec
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What is the importance of subscripts when writing a chemical equation? (3 points)
The subscripts in a chemical equation shows the number of atoms of each element in a compound.
What is a chemical equation?A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
Chemical equations involves molecular formulas of compounds that make up the reactant and products. The molecular formula is a notation indicating the number of atoms of each element present in a compound.
Subscript is a type of lettering form written lower than the things around it. The subscript shows the number of atoms of an element in a compound.
Examples of elements with evident subscripts are as follows:
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There are more white blood cells than red blood cells in the blood.
True or false
Answer:
it's false the correct answer will be There are more red blood cells than white blood cells in the blood
How do heat waves form
Answer:
Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, according to AccuWeather. What qualifies as a heat wave can vary greatly from region to region.
show the linkages between a trisaccharide with the sequence glca–glca–glca. the trisaccharide has an α1→4 glycosidic linkage between the first and second \glca monosaccharides. the trisaccharide has a β1→4 glycosidic linkage between the second and third glca monosaccharides. show stereochemistry using wedge (upward) or dash (downward) bonds.
Trisaccharides, an oligosaccharide, are created when three monosaccharides are linked together by two glycosidic connections.
What are trisaccharide?Trisaccharides, an oligosaccharide, are created when three monosaccharides are linked together by two glycosidic connections. The constituent monosaccharides can form each glycosidic bond between any hydroxyl group, just like the disaccharides can.
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if cleaning does not throughly remove the surface water from your plastic sample, where in the energy ranges of the ir spectrum might you see a broad peak, indicating the presence of water?
The presence of water on the surface of the plastic sample will be indicated with a broad peak in the 2400 – 3200 [tex]cm^{-1}[/tex] range of Infra-red (IR) spectroscopy.
The term "infra-red (IR) spectroscopy" refers to a method for locating the functional groups that are present in a molecule. The electromagnetic spectrum's infrared area is located between the microwave and the visible spectrum. The typical Infra-red (IR) absorption range is 600-4000 [tex]cm^{-1}[/tex]. The IR spectra of substances that absorb in the IR range exhibits peaks. A molecule that is IR active is water. In the Infra-red region, it absorbs. Water is thus not used as a solvent in IR spectroscopy. Therefore, it is necessary that water existing on the surface of the samples be removed during cleaning before their IR is recorded. However, if cleaning does not get rid of the water that is on the surface, an expansive peak in the IR spectra will show up between 2500 and 3200 [tex]cm^{-1}[/tex].
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Which of the following statements are correct?
Magnesium chloride and magnesium sulfate are ionic compounds.
Methane and carbon dioxide are ionic compounds
An ion that gains an electron has a positive charge.
Ionic compounds have higher melting and boiling points than covalent compounds.
1. Although ethanol is used recreationally in moderation, it is a poison that
becomes lethal when you consume 5 to 8 g of the compound per kg of body
mass, a fact that is not emphasized enough on college campuses, where students
have tragically died from accidental alcohol overdoses. If a 120. 0 lb student
drank an entire 1. 00 L bottle of whiskey (80 proof; 40% ethanol by volume),
how would their consumption compare to the median lethal dose (7. 0 g/kg)?
(1 lb = 453. 59 g; ethanol density = 0. 789 g/cm³) You must use dimensional
analysis
After ingesting 1 L of 80-proof whiskey, the student's consumption of ethanol would, after the application of dimensional analysis, be 5.798 g of ethanol per kilogram of the body.
First, we calculate the mass of ethanol ingested by the student by using dimensional analysis. To do that, we must calculate its volume, which we can do using the total volume (1 L = 1000 mL) and alcohol volume percentage (40% = 0.40). When we have the volume in hand, we can calculate the mass of ethanol using its density (0.789 g/cm³ = 0.789 g/mL).
m(EtOH) = V(EtOH) * d(EtOH) = 0.40 * V(total) * d(EtOH) = 0.40 * 1000 mL * 0.789 g/mL = 315.6 g
So the student would ingest 315.6 g of ethanol. We can now divide that mass by the student's mass to calculate their consumption.
1 lb = 453.59 g = 0.45359 kg
315.6 g / (120.0 * 0.45359 kg) = 5.798 g/kg
This is dangerously close to the median lethal dose and definitely above the lower threshold of 5 g/kg, so the student would definitely be in danger of overdosing.
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in your experiment, you found a height difference () of 155.2 mm of hg at 22 oc. at that temperature, the vapor pressure of water is 19.8 mm hg. if the barometric pressure in the lab was 789 mm hg, what is the pressure of h2 in the buret (in mm hg)? note: do not include the units in your answer.
However, if it is heated to impregnated vapor, volume and work (1W2) will determine the final temperature. result (a) Indicate that the lift pressure should be 400 kPa, using v = V/ m = 0.1 m3/kg
Standard sets of circumstances for experimental measures to be produced at standard temperatures and pressures (STP) enable comparisons to be made between various sets of data. The most commonly used standards are those of the National Institute of Standards and Technology (NIST) and the International Union of Pure and Applied Chemistry (IUPAC), albeit these standards are not generally acknowledged. Different essential delineations for other associations' standard reference circumstances have been established.
In chemistry, IUPAC changed its description of standard temperature and pressure in 1982
Temperature and Pressure
Until 1982, STP was defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 1 atm(101.325 kPa).
Since 1982, STP has been defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 105 Pa( 100 kPa, 1 bar).
STP shouldn't be confused with the standard state generally used in thermodynamic evaluations of the Gibbs energy of a response.
NIST uses a temperature of 20 °C(293.15 K, 68 °F) and an absolute pressure of 1 atm(14.696 psi,101.325 kPa). This standard is also called normal temperature and pressure( shortened as NTP). still, a common temperature and pressure in use by NIST for thermodynamic trials is298.15 K( 25 °C, 77 °F) and 1 bar(14.5038 psi, 100 kPa). NIST also uses" 15 °C( 60 °F)" for the temperature compensation of refined petroleum products, despite noting that these two values aren't exactly harmonious with each other.
The International Standard Metric Conditions for natural gas and analogous fluids are288.15 K(15.00 °C;59.0.
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What mass in grams of ammonia can be made from 340 g of H₂?
The balanced equation for ammonia formation is:
N2 + 3H2 ---> 2NH3
First we need to figure out how many moles of hydrogen, 340 grams nets us. We can do this by dividing 340 by the molar mass of diatomic hydrogen (2.016 grams/mole). This will get us 168.651 moles.
From the chemical formula, we see that it takes 3 moles of hydrogen to produce 2 moles of ammonia. So, if we multiply the moles of hydrogen by (2/3), we can find the moles of ammonia produced.
168.651 x (2/3) = 112.43 moles of ammonia
To convert this into grams, we multiply this number with the molar mass of ammonia (which is 17.031 grams/mole)
112.43 x 17.031 = 1914.8 grams of ammonia. Or if you want to account for significant figures, 1900 grams of ammonia.