Answer:
Modal means the one that occurs most often (averages: mode). In maths, the mode is one of the most common ways to describe a set of data. ... The modal class is, therefore, the group with the highest frequency.
Answer:
Modal means the one that occurs most often (averages: mode). In maths, the mode is one of the most common ways to describe a set of data. ... The modal class is, therefore, the group with the highest frequency. For example: if you counted the number of pencils in different pencil cases and you decided to group them.
Explanation:
தமிழன் ❤
Using this illustration, what is the chemical formula? Picture and possible answers are below.
The answer is It is NH3.....
How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?
The mass of water present in the solution is 21.5 g.
What is concentration?Concentration refers to the amount of solute in a solution. There are various ways of expressing concentration such as;
Molar concentrationMass concentrationPercentage concentrationWe have the following information;
Percent concentration = 35.0 %
mass of solute = 40.0 g
Mass of water = ?
So;
35 = x/40 + x × 100/1
35 = 100x/40 + x
35(40 + x) = 100x
1400 + 35x = 100x
1400 = 100x - 35x
1400 = 65x
x = 1400/65
x = 21.5 g
Hence the mass of water is 21.5 g.
Learn more about percent concentration: https://brainly.com/question/1600559
Given this balanced equation: CS2 + 3 O2 CO2 + 2 SO2
Calculate how many moles of SO2 can be produced with when given 4 moles of CS2.
58.67 g
Now calculate how many moles of SO2 can be produced with when given 4 moles of O2.
Which one is the limiting reactant (4 moles CS2 or 4 moles of O2)? How do you know?
Answer: The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.
Explanation:
The molar mass of element X is 42.3 grams per mol and the molar mass for
element Y is Y 96.7 grams per mol. What is the empirical formula for a substance
containing a mass composition of 52.2% X and the remainder Y?
Answer:
X5Y2
Explanation:
% composition of X = 52.2%
% composition of Y = (100 - 52.2) = 47.8%
This means that there are 52.2g of X and 47.8g of Y in the compound
To calculate the empirical formula of the compound, we first convert the gram value to mole value by dividing by their molar masses.
X = 52.2g/42.3g/mol = 1.234mol
Y = 47.8g/96.7g/mol = 0.494mol
Next, we divide each mole value by the smallest value (0.494mol)
X = 1.234mol ÷ 0.494mol = 2.49
Y = 0.494mol ÷ 0.494mol = 1
We multiply each value by 2
X = 2.49 × 2 = 4.98
Y = 1 × 2 = 2
The simple ratio of X:Y is 5:2, hence, their empirical formula is X5Y2.
An unknown amount of sodium azide (NaN3) reacts and produces 0.033 moles of nitrogen gas. What mass of sodium metal is produced
Answer:
Mass of sodium metal is 130.87 gram
Explanation:
The complete reaction is
2 NaN3 --> 2 Na + 3 N2
We know that PV = nRT
n = [tex]\frac{PV}{RT}[/tex]
On substituting the given values, we get
[tex]n = \frac{\frac{99707}{101325}*75 }{0.082 *(273.15 +15)} \\n = 3.02[/tex]moles of N2
Sodium azide's molar mass
3.02 *(2/3) = 2.013 moles
Mass = 2.03 * 65.01 = 130.87 gram
8. Calculate the pH of a solution if the [OH-] concentration is 0.015 M.
A) 1.82
B) 8.82
C) 12.18
D) 4.32
Answer:
1.82
Explanation:
pH is given by the equation
WILL MARK BRAINLEST
Explain one way that you could lower the amount of trash that your family produces. Be specific in your example. Explain how it will actually lead to a lower amount of trash
Consider the table below that summarizes the types of materials that can block the 3 different types of radiation. Based on the table, at which numbered spot in the table does each type of radiation belong. 1 = beta; 2 = alpha, 3 = gamma
Answer:
D. 1 = gamma; 2 = alpha, 3 = beta
Explanation:
I apologize if this answer is late, but I got answered the question right on my "Types of Radioactive Decay" quiz :)
Hope this is helpful for others! :D
Based on the table, the type of radiation belong from 1 is the gamma rays, from 2 is the aplha rays and from 3 is the beta rays.
What are radiations?During the radioactive decay process, some amount of energy is released in the form of particles and that radiations will known as alpha rays, beta rays and gamma rays.
Gamma ray are mare energetic rays and will shielded by only lead and thick concrete materials.Beta rays are less energetic than gamma rays and will shielded by lead, cloth, paper, wood, aluminium foil and thick concrete materials.Aplha rays have very less amount of energy in it and it will be shielded by all above mention materials.Hence 1 is the gamma rays, 2 is the aplha rays and 3 is the beta rays.
To know more about radiations, visit the below link:
https://brainly.com/question/13909492
CH3(ch2)2C(ch3)3 IUPAC name please?
Answer:
Explanation:
The name is of the compound is 3,3,4,4-tetramethylhexane.
definition of atomic number
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons.
Answer:
its basically represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table
Explanation:
sry i its too long
hope it helps
Drag and drop the labels provided into the boxes below to explain how the Earth-Sun-Moon system results in these seasons on Earth.
When Svante Arrhenius first proposed his acid base theory, he was a doctoral candidate. His professors thought his ideas were unfounded. Within a decade, the Arrhenius theory of acid base was widely accepted and praised within the scientific world. Arrhenius defined acids as compounds having an ionizable hydrogen and bases as compounds with ionizable hydroxides. Eventually scientists adopted a broader theory which includes more compounds to define acids and bases. The Bronsted-Lowry acid base theory defines an acid as a _______ and a base as a ______________.
Answer:
proton donar
proton acceptor
Explanation:
From the given information of the question, Arrhenius acid and base concept is explained, from which a better term to define an acid and base is defined, known as The Bronsted-Lowry acid base theory.
According to The Bronsted-Lowry acid base theory -
An acid is the species which can readily donate a proton, where as, a base is the species, which can readily accept a proton.
Hence, the correct answer is as follow -
proton donar
proton acceptor
Answer:
proton donar
proton acceptor
Explanation:
The songs of birds are part of a ritual to attractpotential partners of their own species. The song presents specific patterns recognized only by membersof the same species. What advantage does this present for the species of birds?
Answer:
Explanation:
Bird courtship and mating dances include many unique ways to attract mates. Learn about their courtship behaviors and why they matter. ... When birders recognize courting birds, they can be sure to avoid disturbing ... the charming songs used to woo partners can help distinguish species so birds are sure ...
Please help me find the answer , thank you.
Answer:
the answeer is definitely silicon.
Is the kool-aid man the jar or the liquid?
I know that this is for school but like i need to know
Answer:
I think both
Explanation:
If 34.2 g of NaOH are dissolved in water to make a 750 mL solution, what is the molarity of the solution?
Answer:
1.14 M
Explanation:
First divide the mass of NaOH by the molar mass of NaOH. Then divide by the volume to get molarity.
34.2 g / 39.997 g/mol = 0.855 mol NaOH
0.855 mol NaOH / 0.750 L = 1.14 M NaOH
HURRY WILL GIVE BRAINLIETS How are proteins and nucleic acids related? They both provide energy. They both carry genetic information. The structure of proteins is determined by nucleic acids. The subunits of nucleic acids are also the subunits of proteins.
Answer: the answer is “C”
Explanation:
Took the T E S T
The results of photosynthesis as glucose and oxygen
A) Photosynthesis
B)Products
C)Chloroplasts
D)Glucose
Answer:
Products
Explanation:
A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 24
Answer:
There are 0.311 moles of gas in the tank
Explanation:
Complete question
A 4.00g sample of gas is found to exert a pressure of 1.71 atm when confined in 3.60L container at a temperature of 241 K. Find the number of moles of the gas
Solution
As we know
[tex]PV = nRT[/tex]
where P is the pressure of the gas in atm
V is the volume in liters
n is the number of moles
R is the gas constant = 0.08206 L·atm/K·mol
and T is the temperature in Kelvin
Substituting the given values in above equation, we get -
[tex]1.71 * 3.60 = n * 0.08206 * 241\\n = 0.311[/tex]
There are 0.311 moles of gas in the tank
Ch.3, S5, page
69, BOS
Calculate the mass of 1.5 moles of calcium atoms.
NA=6x 1023
Mass=
g give your answer to two significant figures.
Answer:
60g
Explanation:
The molar mass of a substance (Atom or molecule) is defined as the mass in grams that 1 mole of substance (6x10²³ particles of this substance) weighs. Using the periodic table of elements we can know the molar mass of each atom.
For example, the molar mass of Calcium is 40.078g / mol.
That means the mass of 1.5 moles of calcium atoms must be:
1.5 moles * (40.078g / mol) =
60ga substance made up of only atoms of one type is called
Answer: chemical element
Explanation: A chemical element is a substance that contains only one type of atom, which is the smallest particle of an element.
can you guys help me :) ?
winner takes all
Answer:
1. Ag2CO3
2.Ba3(PO4)2
3. Cu(OH)2
4. AL
Explanation:
Water circulates through Earth's water cycle by changing its _____.
A. state
B. acidity
C. turbidity
D. composition
PLsss I need answers T-T
4. From the diagram above, what
would need to be the correct genotype for the two green beetles to have the outcome of generation 2?
a HH x hh
b. Hh x Hh
c. Hhxhh
d. Hh x HH
If a lab requires you to use 1.25 mol oxygen gas in a chemical reaction, how many molecules of oxygen will you need?
Answer:
7.53*10²³ molecules of oxygen will you need.
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.
You can then apply the following rule of three: if by definition of Avogadro's Number 1 mole of oxygen gas contains 6.023*10²³ molecules, 1.25 moles contains how many molecules?
[tex]amount of molecules=\frac{1.25 moles*6.023*10^{23}molecules }{1 mole}[/tex]
amount of molecules= 7.53*10²³
7.53*10²³ molecules of oxygen will you need.
A student adds 5400.0mL of 0.15M NaOH to 201.2mL of 4.0M NaOH. What is the final [NaOH]?
Answer:
0.287 M
Explanation:
Multiply the concentration of each solution by the volume of each (in liters) to get the moles of NaOH in that solution.
0.15 M • 5.4000 L = 0.81 mol NaOH
4.0 M • 0.2012 L = 0.80 mol NaOH
Add the mol of NaOH together to get the total --> 0.81 + 0.80 = 1.61 mol NaOH
Divide by the total volume of solution (5400.0 mL + 201.2 mL = 5,601.2 mL = 5.6012 L)
1.61 mol / 5.6012 L = 0.287 M NaOH
Please someone help me and all of the terms do not have to eh used
Answer:
The correct answer is -
1. D. mold
2. A. Cast
3. F. trace fossil
4. C. original material fossils
5. B. fossil record.
Explanation:
Mold is the impression of an organism in a rock that occurs due to the complete dissolving of the organism and only an impression left in sedimentary rocks.
The cast is a fossil copy of an organism in a rock that takes place when water-containing minerals fill the molds and creates a three-dimension copy of the fossil.
Trace fossils are the fossils that are preserved in such a manner that records of biological activity stored only instead of remains of plants or animals.
Storing originals animals or parts of the remaining such as tissue of an organism in natural form is known as original-material fossils.
Fossil records are the fossils ever found or discovered on the earth.
Which of the following is the best example of a symbiotic relationship?
Certain breeds of fish will often clean bigger fish. The cleaner fish gets food, the bigger fish gets a cleaning.
or
A foolish man decides to go swimming in shark-infested waters. As a result, he is bitten by a shark looking for food.
or
A pair of birds fight over a piece of food. The dominant bird wins.
or
The climate changes. As a result, hundreds of species become extinct and the land turns into a desert.
?
Answer:
Certain breeds of fish will often clean bigger fish. The cleaner fish gets food, the bigger fish gets a cleaning.
I'm not too sure.
Good luck! <3
How much heat, in kJ, is released when 6 mol of water at 0°C freezes to ice at 0°C if ΔHsolid for water = –6.01 kJ/mol?
Answer:
12.3 kJ
Explanation:
For a given substance, the molar heat of fusion basically tells you one thing from two perspectives
how much heat is needed in order to melt one mole of that substance at its melting point
how much heat must be removed in order to freeze one mole of that substance at its freezing point
It is very important to realize that the molar enthalpy of fusion will carry a positive sign when you're dealing with melting and a negative sign when you're dealing with freezing.
Weathering (breaking off sediments upriver), erosion (moving the sediments down river) and finally deposition caused the changes in the river.
What helps hold sediments in place to prevent erosion?
Answer:
Explanation:
Maintaining a healthy, perennial plant cover.
Mulching.
Planting a cover crop – such as winter rye in vegetable gardens. ...
Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.???