Answer:
The correct option is;
c. 0.167
Explanation:
The parameters given are;
The mean, μ = 13.9 Gigagrams/year
The standard deviation, σ = 5.8 Gigagrams/year
The z-score formula is given as follows;
[tex]z = \dfrac{x - \mu }{\sigma }[/tex]
Where:
x = Observed score = 11.5 Gigagrams/year
We have;
[tex]z = \dfrac{11.5 - 13.9 }{5.8 } = \dfrac{-2.4 }{5.8 } = 0.4138[/tex]
From the z-score table relations/computation, the probability (p-value) = 0.6605
Where:
x = Observed score = 14 Gigagrams/year
We have;
[tex]z = \dfrac{14- 13.9 }{5.8 } = \dfrac{0.1}{5.8 } = 0.01724[/tex]
From the z-score table relations/computation, the probability (p-value) = 0.4931
Therefore, the probability, [tex]p_{ca}[/tex], that the amount of carbon emissions from cars in Belgium for a randomly selected year are between 15.5 Gigagrams/year and 14 Gigagrams/year = The area under the normal curve bounded by the p-values for the two amounts of carbon emission
Which gives;
[tex]p_{ca}[/tex] = 0.6605 - 0.4931 = 0.1674 ≈ 0.167
Therefore, the correct option is c. 0.167.
Question 1 of 6
Which set of coefficients correctly balances the following chemical equation?
Fe +
Cl2 = FeCl3
(1 point)
DA. 2, 3,2
1
C. 1, 1, 1, (already balanced)
D. 4,6,4
E. 2, 1, 2
tea
B. 1, 2,
Answer:
Option A. 2, 3, 2
Explanation:
We'll begin by balancing the equation. This can be achieved by doing the following:
Fe + Cl2 —> FeCl3
There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cl2 and 2 in front of FeCl3 as shown below:
Fe + 3Cl2 —> 2FeCl3
There are 2 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Fe as shown below:
2Fe + 3Cl2 —> 2FeCl3
Now the equation is balanced.
The coefficients are : 2, 3, 2
What is the Ka of a 0.0675 M
solution of carbonic acid
(H2CO3) with a pH of 5.19?
Ka = [ ? ] x 10
Help ASAP
Answer:
The Ka is 6.183 * 10^-10
Explanation:
The first thing to do here is to write the dissolution equation of carbonic acid in water.
H2CO3 + H20 ———> H30+ + HCO3-
After writing this, the next thing is to write the expression for Ka
Mathematically that would be ;
Ka = [H30+][HCO3-]/[H2CO3]
Next thing is to set up an ICE table
ICE table stands for initial, change and equilibrium.
For clarity sake, please check attachment for the ICE table for this chemical reaction
Mathematically by definition;
pH = -log [H3O+]
From the question, we were made to know that the pH is 5.19
Hence;
5.19 = -log [H3O+]
-5.19 = log [H30+]
[H3O+] = 10^-(5.19)
[H3O+] = 6.46 * 10^-6 M
So how does this relate to the ICE table?
From the ICE table, we can see that the equilibrium concentration of the hydroxonium ion equals x.
This means that the equilibrium concentration of the hydroxonium ion [H3O+] , demoted as x = 6.46 * 10^-6 M
Now according to the Ka equation;
Kindly recall that;
Ka = [H30+][HCO3-]/[H2CO3]
Now, using their equilibrium concentrations;
Ka = (x)(x)/(0.0675-x)
Ka= x^2/(0.0675-x)
Kindly substitute 6.46 * 10^-6 for x
Ka = (6.46 * 10^-6)^2/(0.0675-(6.46 * 10^-6)
Ka = 6.183 * 10^-10
Answer:
The answer is actually 6.18x10^-10
Explanation:
Fill in th box 6.18 and -10
Help me with these questions google won’t tell them for me!!
What is the name of CH3CH2OCH2CH3?
Answer:
It is an ether so the nomenclature rule for naming the above compound will be:Alkoxy alkane , generally Alkoxy represent the smaller alkyl group and as in the above question both the alkyl group are same so it's IUPAC Name will be: Ethoxy ethane or Diethylether both are correct
Explanation:
happy to help ya!
What characteristic of light determines what color it appears?
Answer:
Light is made up of wavelengths of light, and each wavelength is a particular colour. The colour we see is a result of which wavelengths are reflected back to our eyes. The visible spectrum showing the wavelengths of each of the component colours. The spectrum ranges from dark red at 700 nm to violet at 400 nm.The 'colour' of an object is the wavelengths of light that it reflects. This is determined by the arrangement of electrons in the atoms of that substance that will absorb and re-emit photons of particular energies according to complicated quantum laws.The reason that different waves of light appear to be different colors of light is because the color of a light wave depends on its wavelength. For example, the wavelength of blue light is about 450 nanometers, while the wavelength of red light is about 700 nanometers.
Explanation:
Ethane is a member of the hydrocarbon series with the general formula
A) CnH2n+2
B) CnH2n
C) CnH2n–n
D) CnH2n–6
Answer:
A) CnH2n+2
Explanation:
If you were making S’mores [using a chocolate bar, gram-crackers, and marshmallows] at a campfire, would this process be considered a chemical reaction?
Answer:
The process of making S'more by adding chocolate bar, gram-crackers, and marshmallows in layers is not a chemical reaction
Explanation:
In a chemical reaction, the substances involved in the reaction are known as the reactants and the substances produced have different physical and chemical properties than those of the reactants and they are known as the products.
The bonds that hold the atoms of the reactants are broken down and rearranged, creating entirely new substances as products. Therefore, energy must be added and/or evolved in any chemical reaction and all reactant atoms should be involved in the reaction.
The change in energy can be sensed as heat change such as increase or decrease in the temperature of the products
Since S'more does not involve any of the above changes that occur in a chemical reaction when the chocolate bar, gram-crackers, and marshmallows are put together, it is not a chemical change or a chemical reaction.
Student Name:.....
Q1.
The drawing below shows Rebekah pulling a turnip out of the ground.
B
(a)
Which arrow, A, B, C or D, shows the direction of force of Rebekah's hand on the
turnip?
1
1 mark
Answer:
ummm I really want to help with this problem but I think that you forgot the photo of Rebekah Pullin the turnip
1 When a chemical reaction occurs A. the substances involved do not mix together and maintain their original properties. B. the properties of the substances that are produced are identical to the properties of the original substances. C. the substances involved mix together but maintain their original properties. D. the proberties of the substances that are produced are different from the properties of the original substances.
Answer:
D
Explanation:
The proberties of the substances that are produced are different from the properties of the original substances.
A compound is formed by the reaction between magnesium and bromine. What is the chemical formula for this compound?
Answer:
Magnesium Bromide
Explanation:
MgBr₂
Which of these rocks is most likely to be damaged by acid rain?
Limestone
Granite
Gabbro
the answer is limestone because it is the weakest
What type of energy transformation occurs in a campfire?
1.light energy to mechanical energy
2.thermal energy to light energy
3.mechanical energy to chemical energy
4.chemical energy to light and thermal energy
Explanation:
I believe it is number four
Describe air pollution from the burning of forests.
Answer:
Explanation: Wildfires emit carbon dioxide and other greenhouse gases that will continue to warm the planet well into the future. They damage forests that would otherwise remove CO2 from the air.
The reaction nC2H4 + (-C2H4-)n is
an
example of
1.
saponification
2.
esterification
3.
polymerization
4.
fermentation
Answer:
Polymerization
Explanation:
Polymerization is the process by which molecules of small organic compounds combine repeatedly, in a regular manner, to form a complex organic compound. These small organic repeated units are called monomers, while the complex product formed are referred to as polymer.
In this reaction,
nC₂H₄ + -(C₂H₄-)n is the combination of smaller units of C₂H₄(ethene) to form larger units of (C₂H₄)n (polyethene).
Polyethene is formed due to addition polymerization which is the process where ethene break their double bonds to form links, so that the empirical formula of both are the same. This occurs in a chain reaction and the process is known as polymerization.
let me know the answer to this oneeee
1.2 moles of hydrogen
please see the attached picture
hope it helps
Good luck on your assignment
What is the molar ratio of CO2 to C2H2
What natural resources, if any, were discovered or developed over time in Dublin?
Answer:
Resources and power
Discoveries of silver, lead, zinc, and gypsum have been successfully developed, but the country's dependence on imports for its energy requirements is high. In the early 1980s offshore natural gas wells began production in the Celtic Sea south of County Cork.
Explanation:
The primary natural resources of the Republic of Ireland include natural gas, petroleum, peat, copper, lead, dolomite, barite, limestone, gypsum, silver and zinc. Key industries based on these and other natural resources include fishing, mining, and various forms of agriculture and fish farming.
how does water affect the growth of a plant?
Answer:
Water transports important nutrients throughout the plant.
Explanation:
Much like blood in an animal, water is necessary for a plants survival, as it transports important nutrients from the soil all through the plant's stems and leaves.
DISCUSSION QUESTIONS:
1) Distinguish how P-waves and S-waves travel differently with illustrations and
labels.
2) What type of seismic wave will reach a recording station 500 miles away from the epicenter first
Answer:
P-waves compression waves while S-waves are shear waves.
Explanation:
P- waves has the ability to travels through solid, liquid and gaseous medium while S-waves travels through only solid medium and restricted by liquid and gaseous medium. P-waves is a type of seismic wave that will reach first to the recording station as compared to S-waves because P-waves moves faster that S-waves that moves slower so that's why P-waves reach first on the recording station that is located 500 miles away.
which statement describe a species adapting to changes in it’s environment?
Answer: Example: The water in a species envirmoent suddenly becomes more acid therefore, the species adapts it's body to become more resistent and tolerate to chemicals.
This might also give it an adavantage to the species who have not yet adapted to the change
Explanation: There are three type of adaptions. 1) Structural 2) Behavioral 3) Physiological
Which of the following are always the same for atoms of the same element?
Mass of an atom
Atomic number
Neutron number
Mass number
The atomic number remains the same for all atoms of the same element.
The atom is composed of;
ElectronsProtonsNeutronsThe electrons are found in the orbit while protons and neutrons are found in the nucleus of the atom.
The number of protons in an atom is its atomic number. It is the identity of an element. All atoms of the same element must have the same atomic number even though they may differ in mass number.
Learn more: https://brainly.com/question/803445
acid rain water breaks down Rocks by_____ weathering
｡☆✼★ ━━━━━━━━━━━━━━ ☾
This would be 'chemical' weathering.
Acid rain would react with the minerals in the rocks, causing them to break down.
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Stay Brainly! ヅ
- Ally ✧
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Answer:
Chemical
Explanation:
Chemical weathering. The weathering of rocks by chemicals is called chemical weathering . Rainwater is naturally slightly acidic because carbon dioxide from the air dissolves in it. Minerals in rocks may react with the rainwater, causing the rock to be weathered.
HOPE IT HELPS :)
PLEASE MARK IT THE BRAINLIEST!
define the term acid
Answer:
An acid is simply a molecule or a chemical which gives hydrogen ions while mixed or reacted with water
2. Do you think you would have to exercise longer to use the energy that can be released
from three grams of carbohydrate, fat or protein? Why?
A one-ounce bag of Hot Cheetos has 90 calories from fat and 150 total calories. A party size bag of hot Cheetos is 18.5 ounces. How many calories of fat have you consumed if you eat half a bag of party-size chips?
Answer:
832.5 calories
Explanation:
One ounce bag of Hot Cheetos contains 90 calories from fat and 150 total calories. Also a party size bag of hot Cheetos weigh 18.5 ounces.
Therefore the weight of half of a bag of party-size chips = Size of a party size bag of hot Cheetos / 2 = 18.5 ounces / 2 = 9.25 ounces.
Since one ounce bag of Hot Cheetos contains 90 calories from fat, the amount of fat contained in half a bag of party-size chips (9.25 ounces) is given as:
Calories of fat in half a bag of party-size = 90 calories per ounce × 9.25 ounces = 832.5 calories
Answer:
832.5 calories
Explanation:
why did mendeleyev leave spaces in the periodic table
Answer:
Mendeleev left spaces in his periodic table because he predicted there were elements that weren't discovered yet that would fit in these spaces.
Explanation:
Answer:
He left gaps in his periodic table to place elements not known at the time.
Propane burns in oxygen to produce carbon
dioxide and water. What are the chemical
formulas of the reactants and products?
The formulas of the reactants are C3H8, O,
and CO2. The formula of the product is H20.
The formulas of the reactants are C3Hg and
O2. The formulas of the products are CO and
H20.
The formulas of the reactants are C3Hg and
02. The formulas of the products are CO2
and H20.
Answer:
Reactants are C3H8 and O2
Products is CO2 and H20
Why do chemical reactions happen?
Answer:
They happen because each element reacting is trying to attain stability
Explanation:
E.g Mg +Cl>MgCl2
An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of
A) 2–
B) 2+
C) 3+
D) 3–
The answer is D. Why the answer is not A but D? Can you explain?
The net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.
HOW TO CALCULATE NET CHARGE:
The net charge of an ion can be calculated by subtracting the number of electrons from the number of protons in an atom. That is;net charge = no. of protons - no. of electrons
The number of protons is the number of positive charges while the number of electrons is the number of negative charges in an atom. Therefore, if an ion consists of 7 protons, 9 neutrons, and 10 electrons, the net charge is as follows:net charge: 7 - 10
net charge = -3
Therefore, the net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.Learn more: https://brainly.com/question/21430387?referrer=searchResults
If 0.092J of heat causes a 0.267 degree C temperature change, what mass of water is present?
Answer:
0.082g
Explanation:
The following data were obtained from the question:
Heat (Q) = 0.092J
Change in temperature (ΔT) = 0.267°C
Specific heat capacity (C) of water = 4.184J/g°C
Mass (M) =..?
Thus, the mass of present can be obtained as follow:
Q = MCΔT
0.092 = M x 4.184 x 0.267
Divide both side by 4.184 x 0.267
M = 0.092 / (4.184 x 0.267)
M = 0.082g
Therefore, mass of water was present is 0.082.
