Volume of the 0.45 m solution of HCl would just to neutralize 210 ml of a solution containing 4.7 g of the Ba(OH)₂ is 0.12 L.
The reaction is given as :
2HCl(aq) + Ba(OH)₂(aq) ---> BaCl₂(aq) + 2H₂O
1 mole of Ba(OH)₂ react with the 2 mole HCl
Molarity of HCl, C1 = 0.45 M
Volume of HCl, V1 =.?
The mass of Ba(OH)₂ = 4.7 g
Moles = mass / molar mass
Moles = 4.7 / 171.34
Moles = 0.027 mol
The moles of HCl = 2 × 0.027
= 0.054 mol
Volume = moles / molarity
Volume = 0.054 / 0.45
Volume = 0.12 L
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how many milliliters of 0.650 m k2cro4 are needed to precipitate all the silver in 415 ml of 0.186 m agno3 as ag2cro4(s)?
The milliliters of the 0.650 M K₂CrO₄ are needed to precipitate the silver in the 415 ml of 0.186 M AgNO₃ as Ag₂CrO₄ is 58.4 mL.
The reaction is given as :
K₂CrO₄ + 2AgNO₃ ---> 2KNO₃ + Ag₂CrO₄
The molarity of AgNO₃ = 0.186 M
The volume of AgNO₃ = 415 mL
Moles = molarity × volume
= 0.186 × 0.415
= 0.077 mol
Moles of K₂CrO₄ = 0.077 / 2
= 0.038 mol
The volume of K₂CrO₄ = moles / molarity
= 0.038 / 0.650
= 0.0584 L
= 58.4 mL
Thus the volume of K₂CrO₄ needed to precipitate all the silver is 58.4 mL .
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1. Make two observations about temperature and salinity on the Caribbean and Pacific sides of
Panama.
Observation #1:
Observation #2:
The two observations about temperature and salinity on the Caribbean and Pacific sides of Panama are:
Observation #1: The Caribbean side of Panama generally has higher temperatures than the Pacific side.Observation #2: The Pacific side of Panama generally has higher salinity levels than the Caribbean side.What are the observations about?Observation #1: The Caribbean side of Panama generally has higher temperatures than the Pacific side due to its location closer to the equator. The Caribbean coast of Panama is generally hotter and more humid than the Pacific side. Additionally, trade winds blowing from east to west across the Caribbean Sea can bring warm and humid air to the Caribbean coast of Panama.
Note that Observation #2: The Pacific side of Panama generally has higher salinity levels than the Caribbean side. This is because the Pacific Ocean is saltier than the Caribbean Sea, due to the fact that the Pacific Ocean has a larger surface area and receives less freshwater from rivers. Additionally, the Panama Canal, which connects the Pacific and Caribbean, allows for a mix of water between the two bodies of water, but the Pacific water is saltier and more dense and the effect of the canal is to reduce the salinity of the Caribbean.
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the concentration of toluene (c {7}h {8}) in subsurface soil samples collected after an underground storage tank was removed indicated the toluene concentration was 5 mg/kg. what is the toluene concentration in ppm {m}?
We may use the following conversion factor to convert toluene concentration from mg/kg to ppm: 1 mg/kg equals 1 ppm As a result, the toluene content in subsurface soil samples.
We must multiply the toluene concentration by a conversion factor in order to change it from mg/kg to ppm.
1 ppm is equal to 1 mg/kg * (106 g per kilogramme) / (93 g/mol)
The resulting value is 5 mg/kg * (106 g / 1 kg) / (93 g/mol) = 5 * (106) / 93 = 537,924.19 ppm.
As a result, there are 537,924.19 ppm of toluene in the soil samples.
To convert from mg/kg to ppm, multiply the concentration by the conversion factor (1,000,000 mg/kg).subsurface soil samples collected after an underground storage tank was removed indicated the toluene concentration was 5 mg/kg. what is the toluene concentration in ppm {m}Toluene is a molecular weight of 92.14 g/mol chemical molecule.
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What is the mass in grams of 3. 10 x 10^23 molecules of F2? PLEASE SOMEONE HELP ME!!
3. 10 x 1023 molecules of F2 have a mass in grammes of 1.178 x 1025. A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics,
It is possible to get the mass in grammes of 3.10 x 1023 molecules of F2 by applying the following formula:
Number of molecules times molar mass (in g/mol) equals mass (in grammes).
Since F2 has a molar mass of 38.00 g/mol, its mass in grammes is calculated as follows: mass = 3.10 x 1023 x 38.00 = 1.178 x 1025 grammes.
The amount of matter in a particle or object is represented by the dimensionless quantity mass (symbolised m). The kilogramme is the International System's (SI) preferred unit of mass (kg). mass. [ măs ] a measurement of how much matter is present in or makes up a physical body.
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charcoal from an ancient fire pit is found to have a carbon-14 activity of 0.121 bq per gram of carbon. what is the age of the fire pit? brainly
This fire pit would be 1.6 * 10³ years old, based on the supplied statement.
What uses does carbon serve?Metal smelting makes use of dirty carbon in the shape of coke made from coal and charcoal made from wood. It is crucial for the steel and iron industries in particular. Electric drive brushes, furnaces linings, etc pencils all make use of carbon. Processes for filtration and purification use chemical..
We must determine how long the charcoal sample has been deteriorating in order to determine its age:
[tex]$$\begin{gathered}t=\frac{1}{\lambda} \cdot \ln \left(\frac{R_0}{R}\right) \\\lambda=\frac{\ln 2}{T_{1 / 2}}\end{gathered}$$[/tex]
Combined we get.
[tex]$$t=\frac{5730 \text { year }}{\ln 2} \cdot \ln \left(\frac{\frac{15}{1}}{\frac{63}{5}}\right)$$[/tex]
Finally:
[tex]$$t=1.6 \cdot 10^3 \text { year }$$[/tex]
Result
[tex]$$t=1.6 \cdot 10^3 \text { years }$$[/tex]
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assuming all the salts below are the same concentration, which salt would lower the freezing point of water the most?
The salt that would lower the freezing point of water the most is sodium chloride.
Sodium chloride is the most effective salt at decreasing the freezing point of water. This is because sodium chloride has the highest solubility of all the salts, meaning that it can dissolve and form a solution with a higher concentration of solute. This leads to a decrease in the freezing point of water, as the solute molecules interfere with the structure of the water molecules and prevent them from forming an orderly pattern. Other salts, like potassium chloride, magnesium sulfate, and calcium chloride, may still lower the freezing point of water, but to a lesser degree compared to sodium chloride.
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Calcium chloride is the salt which lower the freezing point of water the most.
The freezing point can be defined as the is the exact temperature at which a liquid becomes a solid. The freezing point of water is 32 degrees Fahrenheit. Freezing point describes the moment of transition much as the melting point captures the moment when ice turns from a solid to a liquid. Normal fresh water freezes at 32 degrees Fahrenheit and seawater freezes at about 28.4 degrees Fahrenheit because of the salt in it. Calcium chloride is highly soluble in water. It lowers the freezing point of water the most. Both calcium chloride and magnesium chloride have lower the freezing points. When calcium chloride comes in contact with ice, it rapidly lowers the freezing point of water and melts snow and ice quickly. Calcium chloride forms brine faster than other salts because of its hygroscopic properties.
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The complete question is,
Assuming all the salts below are the same concentration, which salt would lower the freezing point of water the most?
(a) magnesium chloride
(b) calcium chloride
(c) sodium chloride
The rate constant of the first-order reaction A→3B is 0. 291 s−1. The concentration of A at t=5 seconds is 0. 081 mol/L. What was the initial concentration of A?
The initial concentration of A is 3.58 mol/L.
To calculate the initial concentration of A, we must first consider the rate equation for the reaction. The rate equation is given by:
Rate = k[A]
where k is the rate constant and [A] is the concentration of A. Rearranging the rate equation gives the following:
[A] = Rate/k
Therefore, we can calculate the initial concentration of A by substituting the rate constant and the concentration at t=5 seconds into the rate equation, giving us:
[A] = 0.291 s−1 / 0.081 mol/L
This gives us an initial concentration of A of 3.58 mol/L.
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Ions can conduct electricity during electrolysis because they are free to move and they are... what?
Ions can conduct electricity during electrolysis because they are free to move and they are charged. Hence, the delocalization of ions and electrons conduct electricity.
What are electrolytes?Electrolytes are molten compounds or solution which can conduct electricity due to the presence of free ions in the solution. Neutral atoms when lose or gain electrons, they acquire a charge and become ions.
The mobility of charged particles causes the electrical current. Thus, ions and electrons in a solution which are free to move are conducting. In solid state, these ions are held by strong intermolecular forces.
Hence, they are not free to move in solid state. But in the molten state, they are free to move and conduct electricity.
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the number of protons in an uncharged atom group of answer choices determines the mass number determines the number of isotopes equals the number of electrons in the outer orbital of the atom equals the number of electrons
The number of protons in an uncharged atom is always equal to the number of electrons in the atom.
One of the three fundamental elements that make up an atom is a proton. In the atom's nucleus, protons can be detected. At the heart of each atom, there is a small, dense zone.
Electrons are fundamental particles, not the smaller, more elementary particles that make up protons and neutrons. An electron has an electric charge of -1, which is equal to the electric charge of a proton but is the opposite of it. The location of electrons in an atom differs from that of protons and neutrons, which are found inside the nucleus. Since their electric charges are in opposition to one another, negative electrons are pulled to the positive nucleus.
Except for the majority of hydrogen atoms, the atomic nuclei of all elements contain neutrons. Unlike protons and electrons, which have charges, neutrons are electrically neutral; they have no charge.
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1
Answer the following questions by using the periodic table where necessary.
1. Which element is most reactive?
B. Ca
C. Ne
D. Ar
A. Na
Based on the periodic table, the element that is most reactive is Na.
The correct option is A.
What are reactive elements?Reactivity is a gauge of an element's propensity to create compounds with other elements. While certain elements require energy to react and are inert, others will do so simply and spontaneously. Reactivity is a gauge of an element's propensity to create compounds with other elements.
Reactive elements are the Group 1 and Group 2 metals. Also, the Group 17 and Group 16 non-metals are reactive non-metals.
Group 1 and Group 2 metals form positive ions easily by electron loss. Group 17 and Group 16 non-metals form negative ions by electron gain.
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.What happens when we change a substance from a solid to a liquid to a gas?
When a substance changes from a solid to a liquid, it is undergoing a process called melting. During this process, energy is added to the substance in the form of heat. This energy causes the bonds between the atoms or molecules in the solid to break, allowing them to move freely and take on the characteristics of a liquid.
We can understand by many ways such as when a substance changes from a liquid to a gas, it is undergoing a process called vaporization or boiling. During this process, energy is added to the substance in the form of heat. This energy causes the bonds between the atoms or molecules in the liquid to break, allowing them to move freely and take on the characteristics of a gas.
When a substance changes from a gas to a liquid or a solid, it is undergoing a process called condensation or solidification. During this process, energy is removed from the substance in the form of heat. This energy causes the atoms or molecules in the gas to lose their kinetic energy, slowing down their movement and allowing them to bind together, taking on the characteristics of a liquid or a solid.
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The Correct Question is:-
What will be the reaction when we change any substance from solid to liquid gas?
Look at Figure 1. In the ionic compound NaCl, the sodium ion is the cation. What pattern do you observe in the first word in the names for the other ionic compounds?
We observe the same pattern as Ionic compounds are formed by electrically neutral cation-anion pairs. Ionic bonds hold together ionic compounds. They are named with the cation name first, then the anion name, with the word "ion" omitted.
The charge on cations is positive. They are made of metals on the periodic table's left side. The primary group of metals (Groups 1–8) form cations with a single, fixed charge. The charge corresponds to the periodic table's Group (column) number. After the element name, add the word "ion" to form the cation name.
Anions are charged negatively. They are composed of nonmetals, which are found on the periodic table's right side. Using the Octet Rule, the negative charge is found to be eight (8) minus the Group number. Anions have a single, fixed charge at all times. By changing the element name suffix to "-ide" and adding the word "ion" after the element name, the anion name is formed.
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The alkali metals lithium, sodium, and potassium react violently with water,
The reaction becomes more explosive as you move from top to bottom down
the group. What can you conclude about the rate laws for these reactions as
you move down the group from lithium to potassium?
the rate constant increases because the reactions are faster. The alkali metals lithium, sodium, and potassium react violently with water, The reaction becomes more move from top to bottom down.
Due to its strong reactivity, potassium creates this gas the fastest, leading to the violent explosion. Because sodium and lithium have lesser reactivities than other elements (lithium being the lowest), their reactions aren't quite as explosive. Similarily, 53/20 x 250/1000 = 0.6625g of anhydrous sodium carbonate is needed to make a 250 ml solution of N/20. Therefore, 0.6625g of anhydrous sodium carbonate needs to be dissolved in 250 ml of distilled water to produce a N/20 solution.and potassium react violently with water, The reaction becomes more explosive as you move from top to bottom down.anhydrous sodium carbonate is needed to make a 250 ml solution of N/20. Therefore.
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19. what should the difference be from entering water temperature to exiting water temperature in a water cooled condenser using a recirculating water loop?
The difference be from the entering water temperature to the exiting water temperature in the water cooled condenser using the recirculating water loop is 10 °F.
When using the water-cooled condenser, the water should be constantly move over the condenser. For this process, the water should flow in and at the bottom of part and water should flow out at the top part. A water-cooled condenser will lasts years longer, the maintenance is not neglected. water-cooled condenser has the higher heat transfer rate.
Thus, 10 °F is the difference be from the entering the water temperature to the exiting water temperature .
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An experiment requires 43.7 g of isopropyl alcohol. Instead of measuring out the sample on a balance, a chemist dispenses the liquid into a graduated cylinder. The density of isopropyl alcohol is 0.785 g/mL. What volume, in milliliters, of isopropyl alcohol should be dispensed?
The density of isopropyl alcohol is 0.785 g/mL. 22volume, in milliliters, of isopropyl alcohol should be dispensed.
What is density ?
Mass per unit volume of a solid substance; density. Density is defined as d = M/V, where M stands for mass, and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.
What is isopropyl alcohol?
Common names for isopropyl alcohol include "isopropanol," "n-propanol," and "dimethylcarbinol." It is a colorless, flammable liquid with the chemical formula C3H8O.
Therefore, density of isopropyl alcohol is 0.785 g/mL. 22volume, in milliliters, of isopropyl alcohol should be dispensed.
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beryllium's atomic mass is 9, and its atomic number is 4. how many neutrons are found in a beryllium atom?
The number of neutrons possessed by beryllium with atomic mass is 9, and its atomic number is 4 is 5 neutrons.
What is neutron?A neutron is a subatomic particle with no charge that is a component of an atom's nucleus.
By deducting the number of protons or atomic number from the mass number, one can determine the number of neutrons that make up an atom of an element.
In other words, the number of neutrons equals the mass number minus the number of protons.
This suggests that the proton number or atomic number of beryllium is 4. An isotope of beryllium-9 has the following number of neutrons:
Neutron number = 9 - 4 = 5.
Because of this, an isotope of beryllium-9 has five neutrons.
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consider the (100), (110), and (111) planes in a silicon crystal. what is the surface atom density (number of atoms per cm2) for each of the planes?
Answer:single crystal surfaces
Explanation:
if 53 grams of magnesium oxide reacts with an excess amount of sodium chloride, how many grams of magnesium chkiride wikk ve nade
If 53 grams of magnesium oxide reacts with an excess amount of sodium chloride there would be 125.18 g magnesium chloride
The limiting reactant is magnesium oxide since NaCl is in excess, which MgO has a mass of 53.00 grams.
MgO molar mass is 40.31 g/mol.
MgCl₂'s molar mass is95.211 g/mol
The equation with a balance reaction
2NaCl + MgO → Na2O + MgCl₂
We should determine the moles of MgO
Mass MgO divided by molar mass MgO yields moles of sodium chloride.
moles of MgO = mass/ molar mass
moles of MgO = 53 grams / 40.31 g/mol
moles of MgO = 1.3148 moles
Calculate the moles of Na₂O
MgO is the limiting reactant.
To make 1 mol of Na₂O and 1 mol of MgCl₂ we need 2 moles of NaCl, we require 1 mol of MgO.
with unitary method we can calculate the moles of Na₂O
moles of MgCl₂ = 1/1 x moles of MgO
Moles of MgCl₂ = 1.3148 moles
Then calculate the mass of Na₂O
MgCl₂ molar mass is equal to its molecular weight times moles
mass MgCl₂ = 1.3148 moles* 95.211 g/mol. = 125.18 g
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thermodynamic parameters are usually calculated for compounds under conditions, since values tend to vary somewhat with conditions. to be in this state, a gas must have a pressure of 1 , and a solution must have a concentration of 1 . need help? review these concept resources.
The fill in the blanks for the thermodynamic parameters is given as follows :
a) Standard
b) atm
c) M
a) Thermodynamic parameters are the usually calculated for the compounds under the standard conditions.
b) Since the are values tend to vary somewhat with the conditions. To be in this state. A gas must have the pressure of 1 atm.
c) And a solution must have the concentration of the 1 M.
Some of the thermodynamic parameters are as follows :
The enthalpyThe gibbs energyThe TemperatureThe entropyThe PressureThe Adsorption.The Mols.To learn more about thermodynamic here
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you dissolve 92.0 grams of ch3ch2oh, ethanol, in 270. g of water. what is the molality of ethanol in the solution? (fw(ethanol)
While dissolving 92.0 grams of CH3CH2OH, ethanol, in 270. g of water. 7.41 mol/kg, is the molality of ethanol in the solution.
To determine the molality of ethanol in the solution, we need to first find the number of moles of ethanol and then divide that by the number of kg of water.
To find the moles of ethanol, we can use the formula:
Mass of ethanol divided by its molar mass yields moles of ethanol.
moles of ethanol = (92.0 g) / (46.07 g/mol) = 2.00 moles
To find the number of kg of water, we can convert the mass of water from grams to kg using the conversion factor 1 kg = 1000 g:
mass of water in kg = (270. g) / (1000 g/kg) = 0.270 kg
Now, we can calculate the molality of ethanol in the solution using the formula:
molality = 2.00 moles / 0.270 kg = 7.41 mol/kg
The molality of ethanol in the solution is 7.41 mol/kg.
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are electric car batteries bad for the environment?
The environmental impact of electric car batteries depends on the source of the electricity used to charge them and the method of disposal or recycling of the batteries.
If the electricity used to charge the batteries comes from renewable sources, the environmental impact is minimal. However, if the electricity comes from fossil fuels, the environmental impact can be significant. Additionally, proper disposal or recycling of batteries is important to minimize environmental impact. The environment refers to the natural surroundings and conditions in which people, animals, and plants live. It includes everything from the air we breathe, the water we drink, the land we live on, and the weather patterns that affect us.
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Which behavior is a response that is determined by heredity?
Responses
fighting for protection
fighting for protection
All behaviors are determined by heredity.
All behaviors are determined by heredity.
hunting in packs
hunting in packs
sleeping
Answer:
sleeping
Explanation:
......hope this helps, :)
what is the best safety practice recommended before leaving the chemistry laboratory? group of answer choices
The best safety practice that is recommended before leaving the chemistry laboratory is that remove the lab coat, the goggles and the gloves and wash the hands properly.
The best safety practice that is recommended before leaving the chemistry laboratory are :
Remove the lab coat before leaving chemistry labRemove the goggles before leaving chemistry labRemove the gloves before leaving chemistry labWash the hands properly before leaving chemistry labThese are the some basic safety practices that is recommended to follow before leaving the chemistry laboratory. Wash the exposed areas. Most of chemicals are toxic , so clean it properly before leaving the lab.
This question is incomplete, the complete question is :
what is the best safety practice recommended before leaving the chemistry laboratory? group of answer choices :
1) remove lab coat
2) remove goggles and the gloves
3) wash the hands properly.
4) none of the above
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the maximum number of electrons that may occupy the third energy level is
Eight electrons are the most that can fit into the third energy level. This is due to the Aufbau principle, which states that the third energy level, often known as the "n=3" level, can only store a maximum of 8 electrons.
According to the Aufbau principle, electrons first occupy orbitals with the lowest energies. Three subshells make up the third energy level: the 3s, 3p, and 3d. The 3s may carry two electrons, the 3p six, and the 3d ten; however, only eight electrons are present since the lowest energy subshell is filled first.Subatomic particles called electrons circle the atomic nucleus of an atom while having a negative charge. They are found in the electron cloud or electron shell, which is positioned outside the nucleus. The chemical characteristics of atoms and how they interact with other atoms are determined by the ratio of the number of protons in the nucleus to the number of electrons in an atom.Quantum mechanics is responsible for regulating the behavior of electrons in atoms.
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In terms of atomic structure, explain why the atomic radius of K is larger than that of Na.
Answer:
potassium (K) has (220 pm) while Sodium (Na) has (180 pm). The potassium atom has an extra electron shell compared to the sodium atom thus the potassium has a larger atomic radius.
How is each measurement represented using scientific notation? 48,000,000,000 a. g = 4.8 × 1010 b. g 48 × 109 g c. 48 × 10-10 g
a. In scientific notation, 48,000,000,000 g is written as 4.8 x 1010 g.
b. The scientific notation for 48 x 109 g is already there.
c. 4.8 x 10-9 g is how 48 x 10-10 g is written in scientific notation.
A number is expressed in scientific notation by a coefficient, which is a number between 1 and 10, multiplied by a power of 10. How many times the coefficient must be multiplied by 10 to obtain the original value is indicated by the exponent on the 10.
In case a, the exponent is 10, the coefficient is 4.8, and the result is 4.8 x 1010 = 48,000,000,000.
In case b, the exponent is nine and the coefficient is 48, hence 48 x 109 = 48 x 1000000000 = 48,000,000,000
In C, the exponent is -9 and the coefficient is 4.8, thus 48 x 10-10 = 48 x 0.0000000001 = 0.00000048 is the result.
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why are viruses referred to as being obligate parasites ?
The improvement of energy efficiency in the United States is important. Which scenario is least
likely to occur due to improved energy efficiency in the United States?
O Allow more time to improve use of renewable resources.
O Increase environmental problems.
Make nonrenewable resources last longer.
Reduce dependence on other countries.
Question
*Drag each tile to the correct location on the concept map", for the question.
Read the Instructions for this self-checked activity. Respond to each question, and check your answers. At the
end of the activity, write a brief
evaluation of your work.
The Rank of the diseases in order by number of deaths are:
Heart disease: 647,457 deaths per yearCancer: 599,108 deaths per yearChronic lower respiratory diseases: 160,201 deaths per yearStroke (cerebrovascular diseases): 146,383 deaths per yearAlzheimer’s disease: 121,404 deaths per year.What is the disease about?Heart disease and cancer are the leading causes of death globally, with heart disease causing the most deaths each year. Heart disease can refer to a variety of conditions that affect the heart, such as coronary artery disease, heart failure, and hypertension. These conditions can be caused by a variety of factors, including genetics, lifestyle choices, and certain medical conditions.
Note that Cancer is a group of diseases characterized by the uncontrolled growth and spread of abnormal cells in the body. There are many different types of cancer, each with its own causes and risk factors. Some common types of cancer include lung cancer, breast cancer, and colon cancer.
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a scientist is interested in studying different elements. she has 4 different chemicals on her bench. examine the list of chemicals. how many different elements does she have available to study? chemical namechemical formula phosphoric acid h3po4 glucose c6h12o6 epsom salts mgso4 chlorate of potash kclo3
The different types of the elements does she have available to study are :
Hydrogen, Phosphorus , Oxygen, Carbon, Magnesium, Sulphur, Potassium, Chlorine.
1) The chemical formula of the phosphoric acid is : H₃PO₄
Elements : Hydrogen, phosphorus, oxygen
2) The chemical formula of the glucose is : C₆H₁₂O₆
Elements : Carbon, Hydrogen, oxygen
3) The chemical formula of the Epsom salts is : MgSO₄
Elements : Magnesium, Sulfur, Oxygen
4) The chemical formula of the chlorate of potash is : KClO₃
Elements : Potassium, Chlorine and Oxygen.
Thus, the Hydrogen, Phosphorus , Oxygen, Carbon, Magnesium, Sulphur, Potassium, Chlorine are the different elements to study.
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