The variable "air pressure inside the football" in this experiment is quantitative and dependent variable. Hence, option D is correct.
What is the dependent variable?The dependent variable is the variable that is being measured or tested in an experiment.
In the experiment, the scientist filled the footballs with fix quantity of pressure which was then kept for 12 hours. After 12 hours the pressure inside the footballs was again measured. Pressure here is a quantitative variable.
Since the air temperature is an independent variable. The pressure being the dependent variable depends upon the temperature of the air.
Independent variable; The variable which does not depends upon any other variable.
Dependent variable; The variable which depends upon the independent variable or varies with the change independent variable.
Qualitative variables are variables which cannot be expressed in form of numbers. They generally convey the characteristic, category, quality or type.
Whereas Quantitative variables are the variables which can be expressed in the form of numbers. These are the variables which exist along the continuous sequence.
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Calculate the number of Pt atoms in the cube and find the radius in picometers of a Pt atom. Be sure your answer has the correct number of significant digits. Full questions are in pictures...Thank you!
V cube = 2.2³ = 10.648 cm³
V Pt atoms = 0.75(75%) x 10.648 = 7.986 cm³
Part 1
mass of a single Pt atom = 3.24 x 10⁻²² g
mass Pt atoms = ρ x V = 21.45 g/cm³ x 7.986 cm³ = 171.3 g
the number of Pt atoms = 171.3 : 3.24 x 10⁻²² = 5.287 x 10²³
Part 2
4/3πr³=7.986 cm³
r = 1.24 cm = 1.24 x 10¹⁰ pm
Type of chemical reaction of Ca(OH)2.
Answer:
Combination reaction
This reaction is a combination reaction because calcium oxide and water combine to create calcium hydroxide as the only result.
What is Ca(OH)2?An inorganic substance called calcium hydroxide has several uses. It is also known as slaked lime, and limewater is the name of its aqueous solution.
Calcium hydroxide has the chemical formula Ca in both its composition and structure (OH)
2
and it has a 74.09 g/mol molar mass.
The calcium metal cation is linked to two hydroxide anions in this ionic molecule. Calcium hydroxide has a polymeric structure in its solid state, which is made possible by hydrogen bonds between the layers.
The mineral portlandite, a naturally occurring but seldom type of calcium hydroxide, is present in various volcanic and metamorphic rocks.
In order to make calcium hydroxide for use in industry, calcium oxide (lime or quicklime) is reacted with water.
CaO + H
2
O → Ca(OH)
2
On lesser scales, it may also be produced through the reaction of aqueous calcium chloride and sodium hydroxide.
Physical characteristics: It has a melting point of 580 °C and can be found as white powder or colorless crystals with a density of 2.21 g/cm3.
Chemical characteristics: Water may rather easily dissolve calcium hydroxide. It partly dissolves in water to create limewater, a moderately basic solution. Ca(OH)2 solution or limewater
salts when combined with acids, and it can corrode various metals, including aluminum. The process of carbonatation, which produces calcium carbonate from limewater and carbon dioxide, is advantageous:
Ca(OH)2+ CO2→ CaCO3+ H2O
Uses: Calcium hydroxide is used in a wide range of industrial processes, including the production of Kraft paper, water and sewage treatment, the production of ammonia, and pH adjustment. Additionally, it is a crucial component of mortars, cement, and plaster. It may be used in the food business for a variety of purposes, including pH correction, calcium fortification, digestion help, and baking soda replacement because it is a relatively non-toxic and gentle base.
Calcium hydroxide is not poisonous at low doses and poses no safety risks. However, inhaling, eating, or coming into touch with the aqueous calcium hydroxide solution at greater concentrations might result in lung damage, chemical burns, blindness, or serious skin irritation.
Which of the following is not a type of covalent bond?
A. Quadruple
B. Double
C. Polar
D. Non-polar
Answer:
Quadruple
Explanation:
Answer:
A
Explanation:
The average atomic mass of carbon is 12.01 amu. Based on the atomic
masses of the two isotopes of carbon, how do the relative abundances of the
isotopes compare?
Isotope
Atomic mass (amu)
C-12
12.000
C-13
13.003
OA. There is a slightly larger percentage of C-12 than C-13.
OB. There is a very large percentage of C-12.
OC. There is a very small percentage of C-12.
OD. They are about the same.
Answer: There is a very large percentage of C-12.
Explanation:
The atomic mass is must closer to that of C-12 than of C-13, meaning that there is a much larger percentage of C-12.
Please show steps Thanks
Answer:
chuma ya ndoshi.............
Explanation:
.
kwenda ukalale .............
What is the primary purpose of a rate law?
Oto determine if a chemical reaction will be exothermic or endothermic
O to determine the amount of product that is formed from the concentration of reactants
O to show the relationship between the concentration of reactants and the reaction rate
O to show a relationship between the amounts of gas that can dissolve into a liquid
The rate law uses the molar concentrations of reactants to determine the reaction rate. Hence, option (C) is the correct option
What is rate law ?A rate law shows how the rate of a chemical reaction depends on reactant concentration.
For a reaction such as aA → products, the rate law generally has the form
rate = k[A]ⁿ,
where,
k is a proportionality constant called the rate constantn is the order of the reaction with respect to A.Typically, increased concentrations of reactants increases the speed of the reaction, because there are more molecules colliding and reacting with each other.
Hence , The rate law uses the molar concentrations of reactants to determine the reaction rate. Hence, option (C) is the correct option
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The properties of an element depend on the electron structure within its atoms. The electrons are arranged in different
orbitals, at different energy levels and sublevels. Match each sublevel to the maximum number of electrons it can
accommodate?
The electrons are arranged in different orbitals, at different energy levels and sublevels.
What are Orbitals ?An atomic orbital is a function describing the location and wave-like behavior of an electron in an atom.
This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus.
Following are the sublevel with the maximum number of electrons that can be accommodated by it ;
2 Electrons : S-SubshellTherefore, S-Subshell has 2 electrons, P-subshell has 3 electrons, d-subshell has 10 electrons and f-subshell has 14 electrons.
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-You wish to make a 0.203 M hydrochloric acid solution from a stock solution of 6.00 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 175 mL of the dilute solution?
mL
-In the laboratory, a student dilutes 20.3 mL of a 8.20 M hydrochloric acid solution to a total volume of 200.0 mL. What is the concentration of the diluted solution?
Concentration =
M
-How many milliliters of 9.36 M perchloric acid solution should be used to prepare 1.50 L of 0.700 M ?
mL
For all three questions, we will use the fact that
molarity = (moles of solute)/(liters of solution)1) For 175 mL of solution at 0.203 M, this means that:
0.203 = (moles of solute)/0.175moles of solute = 0.035523 molConsidering the hydrochloric acid solution, if we have 0.035523 mol, then:
6.00 = 0.035523/(liters of solution)liters of solution = 0.035523/6.00 = 0.0059205 = 5.92 mL (to 3 sf)2) If there is 20.3 mL = 0.0203 L, then:
8.20 = (moles of solute)/0.0203moles of solute = 0.16646 molThis means that the molarity of the diluted solution is:
0.16646/(0.200) = 0.832 M (to 3 sf)3) If we need 1.50 L of 0.700 M solution, then:
0.700 = (moles of solute)/1.50moles of solute = 1.05 molConsidering the 9.36 M acid solution, from which we need 1.05 mol of perchloric acid from,
9.36 = 1.05/(liters of solution)liters of solution = 1.05/9.36, which is 0.11217948717949 L, or 112 mL (to 3 sf)How many grams of glucose (C6H12O6) are contained in 555 mL of a 1.77 M glucose solution?
176.980176 g of glucose ([tex]C_6H_{12}O_6[/tex]) are contained in 555 mL of a 1.77 M glucose solution.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
[tex]1.77 M = \frac{Moles \;solute}{0.555 L}[/tex]
mole solute = 0.98235 g/mol
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]0.98235 g/mol = \frac{mass}{180.16 g/mol}[/tex]
mass = 176.980176 g
Hence, 176.980176 g of glucose ([tex]C_6H_{12}O_6[/tex]) are contained in 555 mL of a 1.77 M glucose solution.
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What kind of reaction is symbolized by AB + CD → AD + CB?
O A. Decomposition
OB. Synthesis
O C. Double replacement
OD. Single replacement
C. Double replacement
cations and anions switch places
➪ State the difference between molarity(M) and molality (m) ?
[tex]\sf{}[/tex]
⛄
Which of the following is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order?
A. Infused Design
B. FORFLOW
C. Munich Procedural Model
D. Next Generation Design Model
The Munich Procedural Model is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order. C
What is the Munich procedural design?The Munich procedural model is a design that illustrates several opportunities regarding the order in which design process and stages beyond mere iteration should take.
A procedural model commonly used for development is the V-model.
Hence, the Munich Procedural Model is a simple design model that uses the concepts define, optimize, and develop solutions iteratively and in any order.
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7. What produces more severe burns, boiling water or steam?
Answer:
boiling water
Explanation:
boiling water produces more severe burns
describe how molecular motion and distance between molecules change as ice is heated to become a liquid and the gas
The conversion of heat to kinetic energy inside the water molecules causes the motion of the molecules to increase. The distance between molecules widens when the molecules move more quickly and clash more frequently. (As more heat is absorbed, the distance between molecules for solids, liquids, and gases widens)
What are other portals of entry besides needlesticks?
Answer:
Inhalation (via the respiratory tract)Absorption (via mucous membranes such as the eyes) Ingestion (via the gastrointestinal tract)
Explanation:
The opening where an infectious disease enters the host's body such as mucus membranes, open wounds, or tubes inserted in body cavities like urinary catheters or feeding tubes.
Using a table of standard electrode potentials, label each of the following statements as completely
true or false.
A) Cu²+ can oxidize H2, and Fe can reduce Mn²+
B) Ni²+ can oxidize Cu²+, and Fe²+ can reduce H+
C) Fe²+ can oxidize H₂, and Fe²+ can reduce Au³+.
D) Br₂ can oxidize Ni, and H₂ can reduce Mn²+
E) H* can oxidize Fe, and Ni can reduce Br₂
Answer: B and E are True
Explanation:
Because Fe has a higher oxidation potential than H2, H+ can oxidize it.
[tex]$\begin{array}{llllll}\mathrm{Fe} & \rightarrow & \mathrm{Fe}^{2+} & +2 \mathrm{e}- & \mathrm{E}^{0}=0.44 \mathrm{~V} \\ \mathrm{H} & \rightarrow & \mathrm{H}^{+} & + & \mathrm{e}^{-} & \mathrm{E}^{0}=0 \mathrm{~V}\end{array}$[/tex]
Ni can reduce Br2 because the reduction potential of Ni is more than Br2.
[tex]\mathrm{Ni}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni}^{-} \quad \mathrm{E}^{0}=-0.25 \mathrm{~V}\\2 \mathrm{Br}^{-} \quad \rightarrow \mathrm{Br}_{2}+2 \mathrm{e}^{-} \quad \mathrm{E}^{0}=-1.087 \mathrm{~V}$[/tex]
2. A solution is made by dissolving 3.88 g of NaCl in enough water to make 67.8 mL of solution. What is the concentration of sodium chloride in units of weight/volume percent?
The concentration of sodium chloride in the solution is 5.72% (weight/volume percent).
How to calculate the weight/volume percent concentration?Weight/volume percent concentration (w/v) expresses the amount of solute (in grams) dissolved in a given volume of solution (in milliliters). Specifically, it is defined as the weight of the solute divided by the volume of the solution, multiplied by 100.
To calculate the weight/volume percent concentration, we need to determine the mass of NaCl per volume of the solution.
First, we need to convert the volume of the solution from milliliters (mL) to liters (L):
67.8 mL = 0.0678 L
Next, we calculate the concentration of NaCl in grams per liter (g/L):
Concentration = Mass of solute ÷ Volume of solution
Concentration = 3.88 g ÷ 0.0678 L
Concentration = 57.2 g/L
Finally, we convert the concentration to weight/volume percent by multiplying by 100:
Weight/volume percent = Concentration x 100
Weight/volume percent = 57.2 g/L x 100
Weight/volume percent = 5.72%
Therefore, the concentration of NaCl in the solution is 5.72% (weight/volume percent).
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Write and balance molecular equations for the following reactions between aqueous solutions. You will need to decide on the formulas and phases of the products in each of the cases.
An aqueous solution of barium hydroxide is mixed with an aqueous solution of sulfuric acid.
Answer:
Ba(OH)2(aq) + H2SO4(aq) ----> BaSO4(s) + 2H2O(l)
Engineers are starting on a new project to develop technology. Which of these
statements does not describe something they might do at the very beginning
of the process?
OA. Look at the problems society is facing.
OB. Make a decision about how to best apply the technology.
C. Look at the benefits and challenges of using specific materials.
OD. Decide whether they have designed the best possible product.
Answer: Decide whether they have designed the best possible product.
What are the blue and yellow circles, the red circles, and the darkest blue ?
Answer:
The Red Circles: Liquid, Blue and Yellow Circles: Solid, and Purple Circles: Gas
Explanation:
Should be it based on the picture and given information.
How do models help scientists predict the polarity of molecules?
This is from the Molecular Structure Lab Report: Determining Polarity
In conclusion, modeling is very useful for predicting molecular polarity because chemical bonds among different atoms are generated to equal electrical charges.
What is molecular polarity?Molecular polarity refers to the unequal distribution of electrical charges in the atoms of a molecule.
This unequal distribution leads to the generation of molecular poles (positive and negative) at the ends of the chemical bonds.
In conclusion, modeling is very useful for predicting molecular polarity because chemical bonds among different atoms are generated to equal electrical charges.
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How many grams of copper
Pb + 02 - Pb304 help
Answer:
6PbO +O2 --> 2Pb3O4
Explanation:
The question is incomplete I assume it is
PbO + 02 - Pb304
Design a controlled experiment to test your hypothesis. A controlled experiment is one that only tests one variable. All other variables must remain the same. Make a drawing below that shows how you will set up your experiment. Then, write a description of the one factor that will vary and the two factors that will remain the same.
The problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.
What is an experiment?An experiment is a procedure used to verify a working hypothesis obtained by applying the scientific method.
Experimental variables that can be tested include, for example, temperature, amount of product from a chemical reaction, etc.
In conclusion, the problem is not found here but a possible experiment might be to measure the amount of product from a chemical reaction.
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How many grams of fluorine are needed to generate 7.65 moles Carbon Tetrafluoride
Answer:
36.3375 g
Explanation:
Explain the term 'end point'?
What do you mean by a 1.0 M solution?
Answer:
According to me end point is the end of a reaction
Aryan want to deposit silver on an iron spoon using silver nitrate as electrolyte. Which terminal of the battery he should connect the spoon? What material should the other electrode be made of?
Silver from the anode gets dissolved to reach the cathode, where the spoon will be plated.
What is electroplating?Electroplating is a way of electrolysis, where a thin layer of metal is used to plate a determined object. It is a kinda process to purify a material you want.
The anode contains the metal you want to plate with, in this case, the Ag.
The anode contains the half-reaction of oxidation so:
Ag(s) → Ag ⁺ (aq) + e⁻
In the cathode, you have the spoon, which it takes place the half-reaction of reduction:
Ag ⁺ (aq) + e⁻ → Ag(s)
The electrolytic cell, where the redox reaction takes place, must be filled with a AgNO₃ solution.
Silver from the anode gets dissolved to reach the cathode, where the spoon will be plated.
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Indicate the number of significant figures in the following measured numbers:
a. 45 = __________
f. 980.00 = __________
b. 450 = __________
g. 740000 = __________
c. 0.0045 = __________
h. 0.00000042 = __________
d. 3006 = __________
i. 4050600 = __________
e. 0.00780 = __________
j. 230.0050 = __________
Answer: a = 2 ; f = 5 ; b = 2 ; g = 2 ; c = 2 ; h = 2 ; d = 4 ; i = 5 ; e = 3 ; j = 7
Explanation: Some rules to follow while calculating sig figs is
1. If a number like 4500 is present, only two sig figs are counted, but none of the zeros are, but if 4500. has a decimal point present, then you should count all the numbers available.
2. If a number like .0005 is present, only count 5 as a sig fig, however if the number is .00050, count the 0 after the 5 in this example (this would then have two sig figs.
What is the first step in the scientific process?
O develop a test
O make a prediction about what may be happening
O observe a natural phenomenon
O generate a scientific hypothesis
O check results by repeating work
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \texttt {Observe a natural phenomenon}[/tex]
____________________________________
[tex] \large \tt Explanation \: : [/tex]
At first scientists/researchers observe a natural phenomenon. after enough observation, they make predictions why that phenomenon is happening and the reasons that lead to that particular phenomenon. then they generate scientific hypothesis to explain that phenomenon and after getting enough data they develop tests and perform experiments. And check the results they get and at last based on the results they conclude what actually is happening.
Answered by : ❝ AǫᴜᴀWɪᴢ ❞
PLEASE NO FAKE ANSWERS!! Chemistry!!! Please will give brainliest !! Show work
When 1 mole of Zn and 2 mole of O₂ reacts togethor, It will produce 1 mole of ZnO as O₂ is excess reagent and Zn will act as Limiting reagent and thus it limits the amount of product formed.
What is Limiting reagent ?Limiting reagents are the substances that are completely consumed first in a chemical reaction.
Given ;
Amopunt of Zn : 1 moleAmount of O₂ : 2 moleGiven equation ;
2Zn + O₂ --> 2ZnO
As according to given chemical equation,
2 moles Zn of reacts with 1 mole of O₂ to produce 2 moles of ZnO.
Therefore,
1 mole of Zn will require 0.5 mole of O₂.
But,
the given amount of O₂ is 2 mole which is excess
Hence,
Zn here will act as the Limiting reagent, According to which the amount of product formed will be decided.
Therefore,
If 2 mole Zn produces : 2 moles of ZnO (According to given balanced equation)
Thus,
1 mole of Zn will produce = 2/2 x 1
= 1 mole of ZnO
Hence, When 1 mole of Zn and 2 mole of O₂ reacts togethor, It will produce 1 mole of ZnO as O₂ is excess reagent and Zn will act as Limiting reagent and thus it limits the amount of product formed.
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