The student’s test average points for the four test is 89.3 points
What is average score (mean)?The Mean is defined as the arithmetic average. Mathematically, it can be expressed as:
Mean = (Summation of scores) / number of scores
How to determine the student’s test average pointsThe following data were obtained from the question:
Summation of points = 357.3 pointsNumber of test = 4Average =?Average = (Summation of scores) / number of test
Average = 357.3 / 4
Average = 89.3 points
Thus, the student’s test average points for the four test is 89.3 points
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How many moles are there in 4.2*1023 molecules?
There are 0.697 moles in 4.2 × 10²³ molecules of a substance.
How to calculate number of moles?The number of moles in a substance can be calculated by dividing the number of molecules in that substance by Avogadro's number as follows:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, 4.2 × 10²³ molecules of a substance is given. The number of moles in this substance can be calculated as follows:
no of moles = 4.2 × 10²³ ÷ 6.02 × 10²³
no of moles = 0.697moles
Therefore, there are 0.697 moles in 4.2 × 10²³ molecules of a substance.
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How many milliliters (mL) of 3.153 M KOH are required to make a 9.0 L solution containing 0.345 g KOH per liter?
The volume of 3.153 M KOH required to make the given solution is 948.8 mL.
What is molarity?
Molarity (M) is the amount of a substance in a certain volume of solution.
Total mass of the given solution is calculated as follows;
mass = mass conc. x volume
mass = 0.345 g/L x 9 L
mass = 3.105 g
The volume of 3.153 M KOH required to make the given solution is calculated as follows;
Molarity = mass/volume in liters
3.153 = 3.105/V
V = 3.105/3.153
V = 0.9848 L
V = 948.8 mL
Thus, the volume of 3.153 M KOH required to make the given solution is 948.8 mL.
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how much is the velocity of a body when it travals 600 m in 5 minutes
Answer:
7.2km/h.
Explanation:
Therefore, we get the speed of the man crossing a 600m long street in 5 minutes as 7.2km/h.
Need help please I need to select one element for each following families on the periodic table
There are five Family on the periodic table that are alkali metals , Alkaline earth metals , transition metals , Halogens family and noble gas family.
1) In alkali metals, there are six elements are present and among all the elements Sodium metal should be selected. Because sodium metal is most abundant metal in the world.
uses of sodium aresodium salt are common salt that added to the food to enhance the taste.washing soda are made up of sodium salt which is used as water softener.sodium salts are also used as buffer to maintain Ph.2) In alkaline earth metal family, The magnesium element should be selected.
uses of magnesium aresince magnesium is a soft metal so it can burn easily therefore it is used in fire works.magnesium is also important for proper growth and maintenance of bones.Magnesium is light weight metal so it can used to make car seat , luggage and power tools etc.3) In Halogens gas family , chlorine should be selected.
Uses of chlorine areThe chlorine is used in cleaning purpose as it act as bleaching agent.Chlorine is also used to prepare the pesticides to removes pest in crops.In refrigerators, the cold breeze is coming out is chlorine gas which are used to increase the shelf life of the plants.4) In transition metals , copper metal should be choose.
Use of copper metal areCopper is highly ductile metal so it drawn into wires and used in various electrical purpose.The copper has anti corrosive properties so it can used in making kitchen utensils.The copper has anti microbial property so it can used in packaging of food.5) In noble gas elements, The helium gas should be selected
uses of helium gas areIt used as semiconductors.It used in party balloons.The helium is inert gas so it used to make optical fibers.These are the daily life usage of all the elements of each family of the periodic table.
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Consider the reaction
〖2SO〗_2 (g)+O_2 (g)⇌〖2SO〗_3 (g) ∆H^°=-198.2 kJ⁄mol
Comment on the changes in the concentrations of 〖SO〗_2,O_2,and 〖SO〗_3 at equilibrium if we were to:
Increase the temperature
The equilibrium will change in a backward direction, favouring backward reaction. Equilibrium will shift in forward direction or more of SO 3 will be formed.
The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change. [SO3]: The concentration increases. The concentration decreases. There is no change. Backward reaction will be favoured if pressure decreased.
[SO3]: The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change.
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Did the candle continue it's flame when covered with a jar for a few minutes?why?
Answer:
yes it will because the air in the jar is co2 or o2 and these gases have the capacity to burn things out
What would mix the best with water?
Answer:
salt and sugar can mix the best with water bcoz its an homogeneous mixture
thank uh
What do Uranus’s and Neptune’s atmospheres both contain?
Answer:
Methane
Their atmospheres both contain Methane, which makes them appear blue in color. Neptune is believed to have an active and changing atmosphere. Uranus and Neptune have rings and many moons and are part of a group called the Outer planets.
Explanation:
Answer:Uranus and Neptune have similar masses and internal compositions. Their outer atmospheres are composed of hydrogen, helium and methane, while their mantles are a combination of water, ammonia and methane ices, and their cores are a mix of rock and ice.
Structure. Uranus is one of two ice giants in the outer solar system (the other is Neptune). Most (80% or more) of the planet's mass is made up of a hot dense fluid of "icy" materials – water, methane, and ammonia – above a small rocky core.
Explanation:
If 0.2g of sulfur completely reacts with 0.2g of oxygen, what is the empirical formula of the oxide formed
The empirical formula of the oxide formed, given that 0.2 g of S reacts completely with 0.2 g of O is SO₂
The following data were obtained from the question:
Mass of sulphur (S) = 0.2 gMass of oxygen (O) = 0.2 gEmpirical formula =?How to determine the empirical formulaThe empirical formula of the oxide formed can be obtained as follow:
Divide by their molar mass
S = 0.2 / 32 = 0.00625
O = 0.2 / 16 = 0.0125
Divide by the smallest
S = 0.00625 / 0.00625 = 1
O = 0.0125 / 0.00625 = 2
From the calculations made above, we can conclude that the empirical formula of the oxide formed is SO₂
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Why don’t pressurized steel cylinders of hydrogen quickly (or even gradually) lose their
contents?
Hydrogen quickly can not pressurized steel cylinders because" The low volumetric energy density of hydrogen makes storage a challenge. Since it would be the lightest and most basic element, it is even lighter that helium it is quickly lost in the environment."
A very minor hydrogen leak could occur if hydrogen interacts with the metal or passes completely through to the outside surface. Metal's mechanical characteristics deteriorate when hydrogen is present in the metal's lattice (e.g., fatigue as well as fracture resistance). Hydrogen embrittlement would be a phenomenon (HE).
Intensifying the density and adding additional gas to the tank are two effects of cooling compressed hydrogen gas. Liquid nitrogen was frequently used to chill the system down to 77 K, which triples its volumetric capacity when compared to uncooled hydrogen.
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Determine the mass, in grams, of 0.540 moles of S (1 mol of S has a mass of 32.07 g).
Answer:
17.3178 g
Explanation:
n= m/Mr
m= n x Mr
n= 0.540
Mr of S =32.07
m = 0.540 x 32.07
m= 17.3178 g
Assuming that the smallest measurable wavelength in an experiment is 0.830 fm , what is the maximum mass of an object traveling at 171 m⋅s−1 for which the de Broglie wavelength is observable?
When studying quantum mechanics, the de Broglie wavelength is a key idea. De Broglie wavelength is the wavelength () that is connected to an item in relation to its momentum and mass.
Typically, a particle's force is inversely proportional to its de Broglie wavelength.
Assuming that the smallest measurable wavelength in an experiment is 0.830 fm , what is the maximum mass of an object traveling at 171 m⋅s−1 for which the de Broglie wavelength is observable?
We know:
The shortest wavelength that is detectable, λm = 0.330 fmthe object's velocity, v = 157 m/sAccording to the following equation, an object's de-Broglie wavelength solely depends on its momentum:
λ = h/p = h/m*v, where,
h = 6.626 × 10^(−34) J⋅sp = mv is the object's momentum. It is based on the moving object's mass, m, and velocity, v.By rearranging the above equation, the object's mass can be written as:
m = h/λv
The maximum mass and the minimum de Broglie wavelength of the item are inversely correlated because the two quantities are inversely proportional to one another. When we enter the values provided, we get:
m = {6.626×10^(−34) J⋅s} / {0.330 fm × 157 m/s}
≈ 1.28×10^(−20) kg
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The 117 or so known elements are arranged in the periodic table. Look at the first three rows of the periodic table below. Why does the periodic table have the shape it has?
The periodic table has the shape it has due to the arrangement of electrons in atoms.
What is Periodic table?This is referred to as the arrangement of the chemical elements in a tabular manner and it consists of 18 groups and 7 periods and are arranged in the order of increasing atomic number which have unique chemical properties.
The periodic table has that type of shape due to it having a resemblance of the pattern of how electrons fill the sub shells which is also the same as how they are arranged in atoms which is therefore the most appropriate choice.
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The density of ethanol is 0.789 g/cm^3. A flask holds 165.0 g of ethanol. What is the volume of the ethanol?
a. 4.78 x 10^-3 g
b. 130. g
c. 209 g
The volume of the ethanol that has a density of ethanol is 0.789 g/cm³ is 209.13cm³.
How to calculate volume?The volume of a substance can be calculated by dividing the mass of the substance by its density as follows:
Volume = mass ÷ density
According to this question, the density of ethanol is 0.789 g/cm³. A flask holds 165.0 g of ethanol and the volume can be calculated as follows:
Volume = 165.0g ÷ 0.789g/cm³
Volume = 209.13cm³
Therefore, the volume of the ethanol that has a density of ethanol is 0.789 g/cm³ is 209.13cm³.
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Please help me, please thank tou
How does a lithium cation compare to a lithium atom?
The cation is larger.
The cation has the same radius.
The cation is smaller.
The cation has the same charge.
The cation is smaller.
A lithium atom is said to be oxidized when it loses an electron and becomes a positive ion. When lithium forms chemical compounds with other elements, it loses an electron from each lithium atom and becomes a Li+ cation. These are then attracted to the negatively charged anions of ionic compounds.
When an atom loses an electron, it forms a positive ion. The number of protons in a positive ion is greater than the number of electrons. Therefore, the attractive force between the electron and the nucleus increases, reducing the atomic radius. Therefore, the size of atoms is larger than that of cations. A cation is always smaller than its parent atom because its nuclear charge remains the same and it has fewer electrons.
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(C) The lithium cation is smaller than the lithium atom.
The electronic configuration of the Lithium atom is given as:
1s² 2s¹ and the electronic configuration of Lithium cation is 1s².
The Lithium Cation is smaller because,
Less Energy Levels: As shown in electrical configurations, the Li atom's valence shell is 2 while the Li cations is 1, resulting in a closer spacing between the valence electrons and nucleus and smaller size.
Less Shielding Effect: The shielding effect is the protection provided by the core electrons to the valence electron from the nucleus pull. Since there are no core electrons in a cation of lithium, the electrons are more drawn to the protons, which causes them to be tiny.
More nuclear charge: The Li atom has three protons and three electrons. As a result, the game is slightly balanced because the three protons attract the three electrons. However, as the tone electron in the Li Cation is removed, the proton side becomes stronger and exerts more force on the electrons, bringing them closer to the nucleus and reducing their size.
Hence, the cation is smaller.
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Uranus and Neptune have rings and many moons and are part of a group called ___
Answer:Composition. Jupiter, Saturn, Uranus and Neptune collectively make up the group known as the jovian planets. The general structures of the jovian planets are opposite those of the terrestrial planets.
Explanation:
what is the furthest planet from the sun and closest to the earth
Question: Hello: ) ✨ what is the furthest planet from the sun and closest to the earth ?
Answer: Neptune is the furthest planet from the Sun in our Solar System but there are dwarf planets further out, notably Pluto. Pluto's orbit is a much more elongated ellipse than those of the other planets, so for 20 years out of its 249-year orbit, it is in fact closer to the Sun than Neptune.
Explanation:
In order of distance from the sun they are; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto, which until recently was considered to be the farthest planet, is now classified as a dwarf planeYou might think that the farthest planet from the Sun, or Earth, is Neptune since Neptune is 30 AU or 4.5 billion km / 2.8 billion mi away from us. However, it is actually Pluto who is the farthest planet from the Sun.
Have an awesome Day/Night<3
Answer:
Neptune is the farthest planet from Sun.
Explanation:
Pluto is a dwarf planet therefore it isn't Pluto.
a student prepares a sucrose solution by pipetting 10.00 ml of a 2.15 m sucrose stock solution into a 250.00ml volumetric flask and dilutes to volume with deionized water. what is the molecular concentration of the diluted solution ?
The molar concentration of the dilute solution is 0.086m.
How to calculate the dilution concentration?To calculate the dilute concentration when a stock solution is provided we use the Dilution Equation.
Equation = M₁V₁ = M₂V₂
Where M₁ is the initial molarity (given)
V₁ is the initial volume (given)
M₂ is the final molarity (which needs to be calculated)
V₂ is the total volume (given)
Therefore, M₂ = M₁ ×V₁ ÷ V₂ = 0.086m
The molecular concentration of the diluted solution is 0.086m.
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If you lived in a coastal area
and received a hurricane warming, would it
be safer to travel inland to avoid the storm
or stay along the coastline?
received a hurricane warning its is safer to travel inland to avoid the storm
First, leave the area if instructed to do so or if you believe it would be harmful for you to stay in your house. Depending on the hurricane and its projected path, the terrain and elevation, and the caliber of your shelter, you should move 50 to 200 miles inland. By doing this, you will be sheltered from the strongest winds and the ensuing coastal storm surge. Because hurricane courses are unpredictable and because storm surge and wind can harm coastal roads and traffic signals well before a hurricane makes landfall, it is typically not a good idea to drive along the shore, with the exception of getting to a road that leads inland. Be aware that hurricanes have a more hazardous quadrant for wind intensity, which for hurricanes in the Gulf of Mexico and the Atlantic Ocean in our northern hemisphere is the upper left, northwestern quadrant.
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Hurricane warming indicates that a hurricane could hit your region.
Additionally, if you resided along the coast where the hurricane hit, you should stay inside.Be prepared to relocate inland or to higher ground if you live near the ocean or in a low-lying location. Large waves produced by strong winds may eventually reach the shore and turn into storm surges.Prepare your emergency supply kit. Families need to be equipped to survive on their own for at least three days. Practical supplies like drinking water, food, money, and a portable radio should be included in the kits. But they should also contain things that are specific to the requirements of your own families. This can include things for babies, prescription drugs, pet food, etc.Listen to the most recent advisories and cautions to stay informed.There will be a wind calm that lasts for two to three minutes to a half hour if the hurricane's eye passes over. During this period, remain in a secure location on the main floor but not in the basement. Keep in mind that the winds will change direction once the eye has passed.Although hurricanes are not very harmful, we must be attentive and prepared with specific tools and equipment to deal with them.
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Brainliest! +80pts
In this lab we first mixed some liver with hydrogen peroxide in test tube #1 and observed foaming letting it completely react. Then we poured off the remaining liquid into a second test tube #2. Next we added fresh liver to test tube #2 and no reaction (foaming) occurred because;
A)The liquid in test tube #2 was Oxygen.
B)The liquid in test tube #2 was water.
C)The liquid in test tube #2 was Hydrogen peroxide.
D)The liquid in test tube #2 was Catalase.
Answer:
the answers b
Explanation:
Answer:
D)The liquid in test tube #2 was Catalase.
Explanation:
The price of gas in Paris is 1.29 euro per liter. What is the price of gasoline in dollars per gallon? Assume that one euro is equal to $1.25.
The price of gas in Paris is 1.29 euro per liter . the price of gasoline in dollars per gallon is 6.1039 dollar per gallon.
The price of gas in Paris = 1.29 euro per liter.
we have to convert this in dollar per gallon,
it is given that ,
1 euro is equal to = 1.25 dollar
also, in one liter =0.264172 gallons
now, conversion to dollar per gallons are :
1.29 euro per liter = (1.29 × 1.25 ) / 0.264172 dollars per gallon
= 1.6125 / 0.264172 dollars per gallon
= 6.1039 dollars per gallon
Thus,The price of gas in Paris is 1.29 euro per liter . the price of gasoline in dollars per gallon is 6.1039 dollar per gallon.
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11. (01.05MC)
Compare the type of change that occurs when a substance melts and when a substance is set on fire. Use complete sentences to justify the type of change that occurs.
Answer:
11
Explanation:
Write an argumentative essay on "The Importance Of Homework.
What are the requirements for Science to work in the universe?
The specific requirements in Science to work in the universe include several features, i.e., consistency, observation, predictability and testability.
What do the requirements in Science mean?The expression 'requirements in Science' makes reference to all issues that must be fulfilled to work in a given scientific field in particular as the case of physics in the Universe, which depends on several characteristics, especially predictability and testability.
In conclusion, the specific requirements in Science to work in the universe include several features, i.e., consistency, observation, predictability and testability.
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A 85.4 lb child has a Streptococcus infection. Amoxicillin is prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d.
The amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.
What is the amount of Amoxicillin dose given to the child?
The amount of Amoxicillin dose given to the child is calculated as follows;
amount of Amoxicillin dose = weight of the child x dosage prescribed
What is the weight of the child in pounds (lb)The weight of the child in pounds (lb) is calculated as follows;
1 lb = 0.453592 kg
85.4 lb = ?
= 85.4 x 0.453592 kg
= 38.74 kg
amount of Amoxicillin dose = 38.74 kg x 45 mg/kg
amount of Amoxicillin dose = 1,743.3 mg
Thus, the amount of Amoxicillin dose given to the 85.4 lb child daily is determined as 1,743.3 mg.
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The complete question is below:
A 85.4 lb child has a Streptococcus infection. Amoxicillin is prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d. Calculate the daily dose of the child.
1. An aluminum can of a soft drink is placed in a freezer. Later, you find that the can is split open I and its contents frozen. Work was done on the can in splitting it open. Where did the energy for this work come from?
Answer:
It came from the soft drink being frozen.
Explanation:
When a drink gets frozen it expands and it causes the can to split open
0.0005 L
Express your answer as an integer.
Formation of a copper(1) ion from a neutral copper atom
Please find the equation to form copper (I) ion from neutral copper (Cu) below:
The periodic table's 29th element, copper, has an electrical configuration of [tex][Ar]3d^{10} 4s^{1}[/tex]An oxidation reaction occurs when an atom loses an electron to generate a positive ion.Here, to generate a positive ion, copper must lose one electron. The following equation describes how neutral copper atoms can produce copper (I) ions: [tex]Cu[/tex] → [tex]Cu^{+} + 1e^{-}[/tex]Oxidation is also the increase in the oxidation states of an atom or ion or atoms in a molecule. A redox reaction is a type of chemical reaction in which there is a transfer of electrons from an atom or ion to another resulting in a change in oxidation states of the substances involved. The reducing agent in the reaction is undergoes oxidation by losing electrons while the oxidizing agent is reduced that is it gains electrons at the end of the reaction. The atom or ion from which electron is lost is said to be oxidized while the other atom or ion involved in the reaction is reduced.Hence, the correct equation is mentioned above.
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what letter appears once on the periodic table
It’s ‘x’
’x’ only appears once
What is one relationship between the section Dressing For The Lab" and the section "Making A Plan And Staying Focused
The fact that both emphasize how crucial it is to plan ahead for lab experiments is one connection between the two sections.
How do you get ready for the lab?
We are aware that we conduct experiments in a laboratory. The majority of the experiments we conduct in the lab are either designed to support or refute a hypothesis. We conduct experiments from time to time to ascertain a scientific law.
We now need to think about the sections "Dressing for the Lab" and Making a Plan and Staying Focused." Dressing for lab prepares us for any accident or mishap that might take place while performing our experiment. Making a plan and staying focused emphasizes the fact that we must be prepared with what action plan or steps we have to follow and what equipment and material are required for the experiment.
Therefore, the fact that both emphasize how crucial it is to plan ahead for lab experiments is one connection between the two sections.
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