Mendeleev was the first scientist to classify elements into what called the periodic table. However, unlike the modern periodic table that we use today, Mendeleev classified elements based on the mass number and not by atomic number.
What is periodic table ?Periodic table classify all known elements into different groups and periods. The vertical columns in the table are called groups and the horizontal rows are called periods. All the elements are classified based on their atomic number in the modern periodic table.
At the time of Mendeleev there were only 65 to 70 known elements. He classified these elements based on their mass number. The periodicity of these elements and their classification into groups all were based on their mass number.
However, later Mosely found that, the properties of an atom is purely based on their atomic number and not by mass numbers. He forwarded the modern periodic table based on the atomic number of elements.
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True or False: The atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen.
A.
True
B.
False
The statement that atoms that make up the element oxygen are exactly the same as the atoms that make up the element hydrogen is False.
This is because, all atom of different element are unique, and elements are all the different types of atoms.
What is an atom?An atom can be regarded as the smallest unit of ordinary matter which is required in making chemical element.
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A person who is interested in the role of genetics in health might pursue a career in
A)endocrinology
B)gene therapy
C)neuroscience
D)sports medicine
Which of the following best describes the conditions created by El Niño? When is that normally blowup to east get stronger waters off the coast of north America cool down and upwelling increases in proving the nutrients in the water. Wednesday normally blood to the west get stronger waters off the coast of South America cool down and upwelling increases improving the nutrients in water. When is the normally blowup to the west slacken waters off the coast of South America walk up and upwelling decreases reducing the nutrients in the water
1) what causes the magnetic fields on the sun?
2) describe sunspots.
3) describe solar flares.
4) describe solar prominence's.
5) describe coronal holes.
2. Sunspots can be defined as the cooler part of the sun which appears dark at the sun's surface.
3. flares can be defined as those sudden flash of light generated by the sun which contains high energy photons and particles.
4. Solar prominence is defined as a phenomena that occurs in the sun which are glowing clouds that contain hot ionized gases.
5. Coronal hole is defined as a region located at the Corona of the sun which is characterized to be less dense and is cooler than its surrounding.
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What happens to gas particles when a gas is compressed?
She is flying in windless conditions along the equator what is the area c called
Based on the chart, how are fish and dogs related?
They belong to the same kingdom but different phyla.
They belong to the same phylum but different classes.
They belong to the same kingdom and class.
They belong to the same phylum and class.
Based on the chart. fish and dogs related in that they belong to the same phylum but different classes.
What is taxonomic classification?Taxonomic classification is the science oif classifying living organisms based on similarity in structure, function of body parts and biochemical composition.
In taxonomic classification, organisms are classified into:
Kingdoms,Phylum,Class,Order,Family,Genus and Species.Based on the chart. fish and dogs related in that they belong to the same phylum but different classes.
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Answer:
fish and dogs
Explanation:
i did the test
the gram formula mass of a compound is 48 grams. the mass of 1.0 mole of this compound is
An engineer is designing a process to cool hot water from a power plant before returning the water to the environment. His plan is to allow the hot water to flow past a pipe containing a solution that is undergoing a chemical reaction. The chemical reaction will be able to remove some of the water's heat through the metal pipe. Which of the following reactions could take place inside the cooling pipe to remove heat from the hot water? A. C + O2 → CO2 + heat B. CaCl2 → Ca2+ + 2Cl- + heat C. NH4Cl + heat → NH4+ + Cl- D. N2 + 3H2 → 2NH3 + heat
Answer:
Explanation:
Just look at the photo it will tell you the answer it’s the explanation from study Island
How much salt is in 300 g of a 3.5 % solution of salt water?
Which of the following is a scalar? (1)centripetal force (2)weight (3)speed (4)acceleation
Answer:
The correct answer is option 3.
Explanation:
Scalar quantity is the quantity with magnitude but no direction.
For example : mass, speed etc.
Vector quantity is the quantity with magnitude along with the direction.
For example : velocity, acceleration etc.
Speed is a scalar quantity as it does not have any direction but only magnitude.
Where as :
Centripetal force and weight is type of force. A force is generally a product of mass and acceleration of the object. And as we know that acceleration depends upon velocity of the object which is vector quantity. Hence, it will be correct to say that centripetal force is a vector quantity.
Weight and acceleration are also vector quantities.
describe the difference in structure between beH2 and CaH2
rubbing alcohol contains 60.0%C, 13.4%H, and 26.6%O. what is the molecular formula of rubbing alcohol if its molecular mass is 60.11g/mol?
The molecular formula of rubbing alcohol is C2H5O.
Explanation:The molecular formula of rubbing alcohol, given its percentage composition, is C2H6O. The molecular mass of rubbing alcohol is 60.11 g/mol. To determine the molecular formula, we need to find the empirical formula first. The empirical formula of rubbing alcohol is CH3O. Finally, we can calculate the ratio between the molecular formula mass and the empirical formula mass to obtain the molecular formula of rubbing alcohol: (60.11 g/mol) / (32.04 g/mol) = 1.874. So, the molecular formula of rubbing alcohol is approximately C1.874H4.621O1.874. Since we can't have fractional subscripts in a molecular formula, we can round the subscripts to give the final molecular formula, which is C2H5O.
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Which property of an object changes when an unbalanced force acts on it?
A. Mass
B. Inertia
C. Velocity
D. Temperature
Answer:
velocity is the answer i just did this quiz
If you purchase four 750 gram jars of table salt (NaCl) and dump them all onto 1,000 kg of snow, how much would the freezing point be lowered after all of the salt has dissolved?
Final answer:
When dissolving table salt in snow, the freezing point depression can be calculated based on the number of ions formed. By converting the mass of the salt to moles and considering ion dissociation, the freezing point depression can be determined.
Explanation:
The freezing point depression of a solution can be calculated by considering the number of ions formed upon dissolving the salt in water. In this case, if you dissolve four 750 gram jars of table salt (NaCl) on 1000 kg of snow, the total mass of salt would be 3000 grams. Converting this to moles and considering the dissociation of NaCl into Na+ and Cl-, you can calculate the freezing point depression using the formula provided.
Which of the following best describes an advantage of cloning? Can prevent genetic diseases Can increase genetic diversity Helps increase lifespan of cloned organisms Helps reduce health issues in cloned organisms
Answer:
prevents genetic diseases
Explanation:
yes
An advantage of cloning is that it can potentially prevent genetic diseases in organisms. Cloning allows for the replication of an organism's genetic material without introducing new genetic variation, which means that if the original organism is free from certain genetic diseases, its clones would also be free from those diseases. This can be particularly valuable in agricultural and medical contexts.
For example, in agriculture, cloning can be used to replicate plants or animals that have desirable traits and are disease-free. This ensures a consistent supply of healthy, high-yield crops or livestock, reducing the risk of crop failure or disease outbreaks.
In the medical field, cloning can be used for therapeutic purposes to create tissues or organs for transplantation. By cloning cells from a patient's own body, the risk of immune rejection is minimized, reducing the chances of complications and improving the patient's overall health.
However, it's essential to note that while cloning has its advantages, ethical and moral considerations, as well as potential unintended consequences, must be carefully addressed when implementing cloning technologies.
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What physical process changed the geological area and composition of the Earth's oceans shown in the two pictures below
for all my study island friends the answer is tectonic plates
The physical, geological, and compositional changes of Earth's oceans are possibly due to plate tectonics, weathering, erosion, and sedimentation. Plate tectonics form and move continents and ocean basins, leading to changes in geographical locations. Weathering and erosion, followed by sedimentation, alter land surrounding the sea and seafloor.
Explanation:The physical process that changed the geological area and composition of the Earth's oceans could include plate tectonics, weathering and erosion, and sedimentation. Plate tectonics leads to the formation and movement of continents and ocean basins. This can greatly influence the geological shape of the oceans. Weathering and erosion can change the shape and composition of the land surrounding an ocean over time. These eroded materials can be carried into the ocean through rivers and streams, altering the composition of the ocean floor. Sedimentation, the laying down of particles transported by wind, water, or ice, can also lead to changes in an ocean's geography by layering materials and forming new landforms.
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Which of the following rate constants corresponds to the reaction that converts reactants to products in the least amount of time? A. 4.48 x 10-5 min-1 B. 4.48 x 10-5 s-1 C. 0.0547 s-1 D. 0.0547 min-1
Consider this reaction. What volume (in milliliters) of oxygen gas is required to react with 4.03 g of Mg at STP? 1860 mL 2880 mL 3710 mL 45,100 mL
Answer: 1860 mL
Explanation:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
According to Avogadro's law , 1 mole of every gas occupies 22.4 L at standard temperature and pressure and 1 mole of every substance weighs equal to its molar mass.
[tex]2moles=2\times 24.305=48.61g[/tex] of Magnesium reacts with 22.4 L of oxygen gas STP.
4.03g of Magnesium reacts with=[tex]\frac{22.4L}{48.61g}\times 4.03g=1.86L=1860ml[/tex] of oxygen gas STP.
Nitrogen can ionically bond with an unknown element X from group 2. How many ions of element X are required to create a stable ionic compound with nitrogen? A) 2 B) 3 C) 4 D) There is not enough information.
Answer is: B) 3.
Nitrogen (nonmetal) in this compound has oxidation number -3 and element X (metal) has oxidation number +2.
Smallest common multiple for 3 and 2 is 6.
number of nitrogen atoms = 6 ÷ 3.
number of nitrogen atoms = 2, there are two nitrogen atoms.
number of atom X: 6 ÷ 2 = 3.
For example, Mg₃N₂ is magnesium nitride. Nitrogen has -3 oxidation number and magnesium has oxidation number +2.
What is the quantity of heat that is released when 27.9 g of H2O condenses? Use mc021-2.jpg. 60.00 kJ 61.05 kJ 63.09 kJ 68.60 kJ
if blockages of this type occur,the most likely result would be that
Blockages in systems such as the cardiovascular system can lead to severe outcomes like heart attacks due to reduced oxygen and nutrient delivery to tissues. These blockages cause ischemia and hypoxia, leading to potential organ failure and tissue death. The body's limited ability to form alternative blood flow paths highlights the necessity of maintaining unobstructed flow.
Explanation:If blockages of this type occur, the most likely result would be a significant compromise in the function of the affected organ or system, mainly due to reduced blood flow and oxygen delivery to the tissues. These blockages, especially in arteries such as the coronary artery, can lead to severe conditions like heart attacks or myocardial infarction, where the heart muscle tissues are deprived of oxygen and nutrients, resulting in the death of cardiac muscle fibers.
In general, blockages can cause ischemia (reduced blood flow) and hypoxia (decreased supply of oxygen to tissues), which can severely affect organ function and lead to tissue death. This concept can also apply to other scenarios, such as blockages in plumbing systems causing backups, or in geology, where mud flows can block bridges and cause flooding. In each case, the obstruction impedes the normal flow, leading to potential damage or failure of the system.
The body has some capacity to form alternative paths for blood flow, known as anastomoses, but this ability is limited, especially in critical areas like the heart. Therefore, blockages that reduce the size of the opening and create turbulence can significantly slow down fluid movement, emphasizing the critical need for unobstructed flow within the cardiovascular system and beyond.
Heat can be transferred from one material to another by direct touch, by differences in density in a fluid, and by ______ conduction convection temperature difference radiation
Heat can be transferred from one material to another by direct touch, by differences in density in a fluid, and by conduction.
What is conduction?
Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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Identify a situation in which you would want to have a high resistance and a situation in which youwould want to have a low resistance
Final answer:
In physics, high resistance is essential for safety in insulators, such as those for power lines, to prevent current leakage, while low resistance is desired in electrical wiring for devices to ensure minimal energy loss and efficient power transmission.
Explanation:
In the realm of physics, scenarios necessitate the use of different resistance levels based on the desired outcome. A situation in which you would want to have a high resistance is an insulator for power lines. These ceramic insulators have resistances of 1012 ohms or more to prevent electrical currents from leaking away from the power lines. On the other hand, a situation where you would want a low resistance is in electrical wiring that powers devices. For example, a large-diameter copper wire which may have a resistance of 10-5 ohms, allowing electricity to flow with minimal energy loss.
Additionally, resistors control current flow in circuits; a huge increase in resistance will reduce current, while a huge decrease in resistance increases current flow. Considering safety, a person working around possible electric hazards would want high resistance insulation to protect against electrical injuries; a resistor shown with a resistance of 20 × 105 ohms is an example of a protective measure.
In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products? kinetic energy closed systems law of conservation electromagnetic energy
Answer : The correct option is, Kinetic energy.
Explanation :
According to the kinetic energy, the kinetic energy is directly proportional to the mass of an object and the square of the velocity of an object.
The formula of kinetic energy is,
[tex]K.E=\frac{1}{2}\times m\times v^2[/tex]
where,
K.E = kinetic energy
m = mass of an object
v = velocity of an object
From this we conclude that there is a direct relationship between the kinetic energy and the mass of an object.
As per question, the reactant have a mass of 10 grams and contains energy 1000 J and the product have a mass of 5 grams and contains energy 500 J that means as the mass of an object decreases, the kinetic energy is also decreases.
Hence, the correct option is, Kinetic energy.
Answer:
C. law of conservation of energy
This is the correct answer on edge.
what is sodium polycrylate
How is compound different from a mixture?
A. it is made of one substance
B. it cannot be made of organic materials
C. it cannot be broken down
D. it cannot be separated by a physical change
Why are two changes of state of the refrigerant necessary to operate a refrigerator?
The two changes of state of the refrigerant are necessary to operate a refrigerator because liquid refrigerant must evaporate and cool.
What is refrigerator?A refrigerator is a heat engine in which work is done on a refrigerant substance in order to collect energy from a cold region and exhaust it in a higher temperature region, thereby further cooling the cold region.
What is liquid refrigerant?The liquid refrigerant is used for heat transfer in a refrigeration system, which absorbs heat at a low temperature and low pressure and rejects heat at a higher temperature and a higher pressure.
Explain refrigeration cycle?This cycle is based on the process of changing the physical state of the liquid refrigerant (from liquid to gas and vice versa). These substances condense to liquid at high pressures and evaporate to gases) at low pressures. The cold in cooling systems happens due to the change of state of this liquid refrigerant fluid to gas.This process depends on the work done by the compressor – which uses mechanical energy to compress the liquid refrigerant from the evaporator in the gas phase.With this compression, the pressure and temperature of the liquid refrigerant increases. When it enters the condenser, the refrigerant transfer the heat to the environment, causing its temperature to decrease and condensation occurs, which is the process of phase change from gas to liquid.After that, the liquid refrigerant passes through the control element – capillary tube or expansion valve – which, by narrowing the passage, slows its speed on the evaporator, causing its pressure to decrease. The liquid refrigerant arrives on the liquid state and under low pressure to the evaporator, during which it is changing phase again, from liquid to gas. When you change phase, it absorbs the heat present in the conditioned items in the refrigerator case and returns to the compressor, restarting the refrigeration cycle.The liquid refrigerant must evaporate (change from a liquid to a gas) and cool. This process releases heat. The cool gas is pumped through tubes so that it can absorb heat from the interior of the refrigerator, keeping it away from the food. Then the gas must condense into a liquid so that it can release the absorbed heat to the outside and begin the cycle again.
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the elements found in family 1 of the periodic table are soft they they can cut with a knife. what other propert do these metals share?
Answer:
they produce extreme heat when mixed with water
...................................................................................................................
Explanation:
Why is the deuterium-tritium reaction the most promising nuclear fusion reaction for future energy production?
Answer:
The most promising of the nuclear fusions reactions for the future is the deuterium-tritium fusion, it comprises the deuterium cycle in which an amalgamation of tritium and deuterium takes place. The reaction produces an enormous energy of 17.6 MeV, however, to attain fusion there is a need to infiltrate the coulomb barrier with the help of tunneling, needing very high temperatures.