Scientists need to measure the effect of pollution instead of the amount of pollution.
What are nitrate pollutants?Ingesting large amounts of nitrate, a frequent groundwater contaminant, can have detrimental effects on one's health. Nitrate has no flavor, no aroma, and no color. Nitrate that occurs in nature at low concentrations can be normal, but excessive amounts can contaminate groundwater.
Effect of nitrate on human life :Stomach acid cannot degrade nitrates on its own. Instead, your gut biome may convert nitrate into nitrite, which may result in health issues like a higher risk of cancer. An inorganic, water-soluble chemical is nitrate.
A growing body of research suggests possible links between nitrate/nitrite exposure and other health issues like elevated heart rate, motion sickness, headaches, and cramps in the abdomen.
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A reaction is found to have an activation energy of 38.0 kJ/mol. If the rate constant for this reaction is 1.60 × 102 M-1s-1 at 249 K, what is the rate constant at 436 K?
The new rate constant is 1.5 * 10^6 M-1s-1 .
What is the rate constant?In this case we know that we have to use the Arrhenius equation to find the rate constant at two different temperatures by the use of the formula;
ln(k2/k1) = -Ea/R(1/T2 - 1/T1)
k2 = Rate constant at 436 K
k1 = Rate constant at 249 K
T1 = initial temperature
T2 = final temperature
R = Gas constant
Ea = activation energy
Hence;
ln(k2/1.60 × 10^2) = -38 * 10^3/8.314(1/436 - 1/249)
ln(k2/1.60 × 10^2) = -38 * 10^3/8.314(0.002 - 0.004)
ln(k2/1.60 × 10^2) = 9.14
k2/1.60 × 10^2 = e^ 9.14
k2 = e^ 9.14 * 1.60 × 10^2
k2 = 1.5 * 10^6 M-1s-1
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A geologist measures the height of a mountain.the height is 5.3489km what is the height in meters write your answer in decimal
Height of a mountain is 5348.9 meter.
1 kilometer is equal to 1000 meter.
The meter, symbol m, is the primary unit of period in the international system of gadgets, although its prefixed paperwork also are used relatively regularly.
A meter is a general metric unit identical to about three feet 3 inches. This means that a meter is part of the metric gadget of dimension. Guitars, baseball bats, and backyard sticks are examples of items which might be approximately one meter lengthy. Meters also are used to measure distances in races, inclusive of strolling and swimming.
Meter readings tell power suppliers how a lot gasoline and energy you are the use of. In case you do not give your provider meter readings they may have to guess your usage. You typically turn out to be paying too much or too little while this occurs.
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Which of the following elements has the fewest valence electrons?
beryllium
boron
carbon
lithium
Answer:
Lithium
Explanation:
Lithium is in group 1 and group 1 elements have only 1 valence electron on their outer shell.
Beryllium is in group 2 so it has 2 valence electrons.
Boron is in group 3 so it has 3 valence electrons.
Carbon is in group 4 so it has 4 valence electrons.
A teacher preforming a demonstration finds that a peice of cork displaces 23.5 mL of water. The peice of cork has a mass of 5.7 g. What is the density of the cork?
Indicate whether a reaction will occur or not when each of the following pairs of substances are mixed; a. copper and dilute hydrochloric acid 9x/9 b. Sodium trioxocarbonate (IV) and trioxocarbonate (IV) acid. C. In case where a reaction occurs, write down a balanced chemical equation for the reaction.
Reaction will not occur in first case and will occur in second case.
A. When Copper is mixed with HCl
When Copper and hydrochloric acid are mixed no reaction takes place because Cu is present below hydrogen. Diluted acids do not react with metals below hydrogen because they cannot replace hydrogen in diluted acid and are less reactive than hydrogen.
B. Sodium trioxocarbonate (IV) and trioxocarbonate acid (IV)-
When sodium trioxocarbonate (IV) and trioxocarbonate acid (IV) are mixed Sodium bicarbonate is formed.
A salt called sodium bicarbonate also called as baking soda decomposes in water to produce sodium and bicarbonate. A solution becomes alkaline as a result, making it capable of neutralizing acid.
The balanced chemical equation is-
Na₂CO₃ + H₂CO₃ → 2NaHCO₃
Hence in A reaction does not occur while in B reaction occurs and Sodium bicarbonate is formed.
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how much molecules does 3ch4 have?
Answer:
3 moles CH4, and each mole contains 6.02x10^23 molecules and each molecule contains 5 atoms, so there are 5 atoms/molecule x 6.02x10^23 molecules/mole x 3 moles = 9x10^24 atoms
Explanation:
A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 77.0 mL. The liquid solvent has a mass of 29.4 g and a density of 0.865 g/mL. Determine the mass of the solid given its density is 2.75 g/mL.
The mass of the solid is calculated to be 118.28g.
How to calculate mass?The mass of a substance can be calculated using the following formula:
Density = mass ÷ volume
According to this question, a liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 77.0 mL. The liquid solvent has a mass of 29.4 g and a density of 0.865 g/mL.
First, we calculate the volume of the liquid as follows:
0.865 = 29.4/volume
volume = 29.4/0.865
volume of the liquid solvent = 33.99mL
Volume of the solid = 77.0mL - 33.99mL = 43.01mL
Mass of the solid = 43.01mL × 2.75 g/mL
Mass of the solid = 118.28g
Therefore, the mass of the solid is 118.28g
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How much valence electrons in 1s2 2s2 2p4
Answer:
This is element 8 which is Oxygen.
Oxygen has two shell
Where L = 2
M = 8
I. E. 8 - 2 =>6
.: it has 6 valence electrons with 0 unpaired electrons.
what has 26 protons, 28 neutrons, and 23 electrons
Answer:
An ion
Explanation:
An ion consists of 26 protons, 28 neutrons, and 23 electrons.
If 119.3 g of PCI 5 are formed from the reaction of 61.3 g Cl 2 with excess PCI 3. what is the percent yield
PCI 3(g) + Cl2(g) → PCI 5(9)
57.3%
48.6%
51.3%
94.6%
66.3%
66.3% is the percent yield for the reaction PCl3(g) + Cl2(g) -> PCl5(g).
The correct option is E.
What is yield in percent?The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield. The percent yield is 100% if the theoretical and actual yields are equal.
A greater yield percentage may be an indication that your product is tainted with water, too much reactant, or other impurities. A lower yield percentage could mean that you miscalculated a reactant or spilled some of your product.
How are percent yields calculated?Divide the theoretical yield by the experimental yield. Calculate the percent yield by multiplying this figure by 100.
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The complete question is-
What is the percent yield for the reaction PCl3(g) + Cl2(g) -> PCl5(g). if 119.3 g of PCl5 (M = 208.2 g/mol) are formed when 61.3 g of Cl2 (M = 70.91 g/mol) react with excess PCl3?
a-57.3%
b-48.6%
c-51.3%
d-94.6%
e-66.3%
co(no3)2 cation and anion
1. The cation in Co(NO₃)₂ is Co²⁺
2. The anion in Co(NO₃)₂ is NO₃⁻
How to determine cation and anion in Co(NO₃)₂We'll begin by defining cation and anion. This is given below:
A cation is an atom which possesses a positive charge.
An anion is an atom or group of atoms which possesses a negative charge
To obtain the cation and the anion in Co(NO₃)₂, we shall write the dissociation equation. This is illustrated below:
Co(NO₃)₂(aq) --> Co²⁺(aq) + 2NO₃⁻(aq)
From the above equation, we can conclude that the cation and the anion in Co(NO₃)₂ is:
The cation is Co²⁺The anion is NO₃⁻Learn more about cation and anion:
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which is larger a hydrogen atom or a francium atom? how can you tell?
Explanation:
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how could you prove that dissolving table salt in water is a physical property, not a chemical change
Answer:
Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed. Physical changes can often be reversed. Allowing the water to evaporate will return the salt to a solid state.
The coastlines in Florida and the deserts in Nevada share landforms that are created when rock weathers into particles that are carried by the wind to form mounds. Identify the landform shared by both states.
Mountains
Dunes
Coastlines
Deltas
B. The landform shared by both coastlines is dunes.
What are sand dunes?Sand dune is the process through which sand grains gather into a mound or ridge by the action breeze caused by gravity.
A sand dune is a landform made from wind or water as deposition agent. This sand dune usually take the shape of a ridge or hill.
How is sand dune formed?Sand dunes are formed when rock break into particles that are easily carried by the wind to form this upward shape.
Once that first upward shape forms, sand gather up on a particular side until it takes the shape of dune
Characteristics of sand dunesDunes form when wind gather sand together through the help of a blocking object or material making sand pile up.Dunes grow as the rate through which this sand accumulate growsEvery dune has a particular side prone to wind known as slipface.Thus, the landform shared by both coastlines is dunes.
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Which statements are TRUE of the picture below? Choose 3 statements.
a
KCl dissolves in water because it is an ionic compound and water is a polar solvent.
b
KCl dissolves in water because it is an ionic compound and water is a nonpolar solvent.
c
The negative chloride ions (Cl-) of KCl are pulled into solution by the slightly negative Hydrogen atoms on the water molecule.
d
The negative chloride ions (Cl-) of KCl are pulled into solution by the slightly positive Hydrogen atoms on the water molecule.
e
The positive potassium (K+) ions of KCl are pulled into solution by the slightly negative Oxygen atom on the water molecule.
f
The positive potassium (K+) ions of KCl are pulled into solution by the slightly positive Oxygen atom on the water molecule.
Answer:
e
The positive potassium (K+) ions of KCl are pulled into solution by the slightly negative Oxygen atom on the water molecule.
Explanation:
Explain any two chemical reactions that amino acids undergo
Chemical reactions involving the carboxyl, amino, and R groups of amino acids are many. Particularly significant are two reactions: cysteine oxidation and peptide bonding.
What function do amino acids ?Amino acids perform a variety of bodily processes, including muscular growth, triggering bodily chemical processes, delivering nutrition, fending off disease, and more. Low levels of amino acids can affect many different aspects of health, including immunity, digestion, depression, fertility, mental alertness, and infant growth.
Where can you find amino acids in the body?Proteins and amino acids are the components of life. Amino acids are the byproducts of the digestion or breakdown of proteins. Amino acids are used by the human body to create proteins that aid in: Dissect food.
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What is an automatic payment?
A. None of these
B. Payment method that builds a balance that you pay off at a later date
C. A regular payment from your current account, for example for a mobile phone bill
D. A balance below zero dollars in your account
When boiling, the total mass of liquid and vaporized water (1 point)
O increases.
O stays the same.
O fluctuates.
O decreases.
When boiling, the total mass of liquid and vaporized water stays the same.
What is law of conservation of mass?The law of conservation of mass states that the mass can neither be created nor destroyed but is transformed from one form to another.
Importance of law of conservation of massThe law helps us to understand the conversion of energy from one form to another.
For example in a torch, the chemical energy of the batteries is converted into electrical energy, which is converted into light and heat energy.
Based on the law of conservation of mass, the total mass of of liquid and vaporized water during boiling will be constant.
Thus, when boiling, the total mass of liquid and vaporized water stays the same.
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Answer: stays the same
Explanation:
When studying evolution, the term "isolation" means one ______.
In evolution, isolation means one group is separated and isolated from a population to study the adaption of evolutionary changes over a period of time.
A natural phenomenon called evolution describes how inheritable traits of a species alter through time.
Natural selection, mutation, genetic drift, and migration are the key drivers. Geographical or reproductive isolation stop the exchange of genetic material across populations. As a consequence of adaptation to a particular environment or niche throughout time, populations of many species changed (natural selection).
When there is a barrier that the creatures can't overcome, they become isolated, which implies they are separated from other members of their species. The isolation of organisms is a consequence of environmental change. When mountain ranges or deserts emerge or when continents separate, isolation may develop gradually.
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What is one element a topographic map shows?
Air flow
Climate
People
Relief
Answer:
climate
Explanation:
they show climate and they are updated every 3 years so we can see how hot the planet is becoming
Which one is bigger 80m or 8km
Answer:
8 km
Explanation:
1 km=1000 m
8 km=
8 km * 1000m/1 km=8000m
8000m>80m
8km>80m
Who is the founder of Blue Bell?
Peter Goemans is the founder of Blue Bell .
Blue Bell was established in 1907 as a means of utilising extra cream from nearby dairy producers. Brenham Creamery Company, the predecessor to the business that is today known as Blue Bell, was founded in 1907. The men who founded it thought the name made sense because it was in the sleepy Texas town of Brenham.
Blue Bell may soon resume selling ice cream after a widespread recall forced the company to lay off 1,500 workers in May. Following a widespread product recall this past spring, Sid Bass, a Fort Worth oil millionaire, has now accepted a "substantial investment" from the Brenham, Texas-based ice cream firm Blue Bell.
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is fluorine is insoluble or soluble ?
Answer:
fluorine is soluble
Explanation:
(4.850 g - 2.34 g)/1.3 mL
A __________ is a natural or human-made body of water surrounded by land.
dune
glacier
hill
lake
Answer:
lake
Explanation:
because its the only thing possible there to be man/human-made
What is the frequency of radiation whose wavelength is 0.81 nm?
Taking into account the definition of wavelength, frecuency and propagation speed, the frequency of radiation whose wavelength is 0.81 nm is 3.48×10¹⁷ Hz.
WavelengthWavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
FrequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Porpagation speedThe propagation speed measures the speed at which the wave disturbance propagates along its displacement.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f× λ
All electromagnetic waves propagate in a vacuum at a constant speed of the speed of light.
Frequency in this caseIn this case, you know:
v= 3×10⁸ m/sf= ?λ= 0.86 nm= 0.86×10⁻⁹ m (being 1 nm= 1×10⁻⁹ m)Replacing in the definition of propagation speed:
3×10⁸ m/s= f× 0.86×10⁻⁹ m
Solving:
3×10⁸ m/s÷ 0.86×10⁻⁹ m= f
3.48×10¹⁷ Hz= f
In summary, the frequency of radiation whose wavelength is 0.81 nm is 3.48×10¹⁷ Hz.
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DEFINE SCIENTIFIC THEORY
Thank you !
pls answer I I’ll give u brainliest
Answer:
low density -> high temperature -> increased particle motion -> high kinetic energy -> high thermal energy -> greater thermal expansion -> more contraction
Explanation:
To model the relationship between these factors, you need to understand how they interact. A greater density of particles usually means they are moving slower, thus resulting in less energy and less heat consequentially. As temperature increases, particles will begin to move rapidly (increase motion) and have higher kinetic energy. Similarly, a lower temperature will lead to less motion and lower kinetic energy. Furthermore, their thermal expansion will be less and have a decrease in contraction, as they will be more compact and dense.
Therefore you could make a model such as:
low density -> high temperature -> increased particle motion -> high kinetic energy -> high thermal energy -> greater thermal expansion -> more contraction
Acetic acid can be deprotonated to form acetate ion, CH3CO–2 . Draw two other resonance structures. Identify the major (most important) and minor (less important) structures.
Acetate ion consists of a central carbon that is double bonded to an oxygen with two lone pairs. It is single bonded to a negatively charged oxygen with three lone pairs. The central carbon is also bonded to a C H 3 group.Step 1: Define resonance structures.
Step 2: Determine when resonance structures can or cannot form.
Step 3: Draw curved arrows to form resonance structures.
Step 4: Determine whether the resonance structures are major (more important) or minor (less important).
© Macmillan Learning
Draw a curved arrow starting from an alkoxide lone pair of resonance structure B, which will form resonance structure C.
⟷
Draw all atoms of the resulting resonance structure C. Show charges and lone pairs
Step-1. Resonance structures are a set of two or море Lewis structures that collectively describe the electronic. bonding a single Polyatomic. Species include functional bonds and functional Charges.
Step-2. All the resonance structures. must follow the rule writing Lewis Structures. The Hybridisation of Structure must stay the same. The skeleton. of the structure cannot be charged the Same Resonance Structure must have the number of lone pairs.
Whenever Structure for you can draw two or more Lewis molecules. different only the location of the electron, the actual structure. is none of the structure but the resonance hybrid of them all.
Step-3 Given in the picture:
Step-4 The acetate anion (CH₂ coo) has two resonance Structures of the same energy.
One in which the T-bond is on one Oxygen.The other where it's on the other oxygen.These overlap to With half - bonds give the resonance. hybrid is poss the c-o intermolecular distance.
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Determine the energy of 1.10 mol of photons for each of the following kinds of light.
infrared radiation (1580 nm )
visible light (520 nm )
ultraviolet radiation (170 nm )
The energy of the photons are;
infrared radiation - 8.3* 10^4 J
visible light - 2.52 * 10^5 J
ultraviolet radiation - 7.72 * 10^5 J
How do we find the energy?The energy of photon could be found by the use of the of the equation;
E = hc/λ * 6.023 * 10^23/1 mole
E = energy of the photon
c = speed of light
λ = wavelength of the photon
Now;
For infrared radiation;
E = 6.6 * 10^-34 * 3 * 10^8/1580 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol
E = 8.3* 10^4 J
For visible light;
E = 6.6 * 10^-34 * 3 * 10^8/520 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol
E = 2.52 * 10^5 J
For ultraviolet radiation;
E = 6.6 * 10^-34 * 3 * 10^8/170 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol
E= 7.72 * 10^5 J
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