why do people use block and teckle systems to move heavy objects?
Sulfur is to the immediate right of phosphorus in the same row in the periodic table. Which of the following statements compares the radius and number of protons of nitrogen and oxygen atoms?
Sulfur has a smaller radius and one more proton than phosphorous.
Sulfur has a smaller radius and one proton less than phosphorous.
Sulfur has a larger radius and one proton less than phosphorous.
Sulfur has a larger radius and one proton more than phosphorous.
Phosphorus (P) belongs to group 15 in the periodic table with atomic number = 15
Sulfur (S) belongs to group 16 in the periodic table with atomic number = 16
Now:
Atomic number = Number of protons present in an element
Therefore:
# protons in P = 15
# protons in S = 16
Now, on moving from left to right across the periodic table, the atomic radius decreases. This is because, as the atomic number increases, the nuclear charge also increases due to which the added electron feels a stronger pull towards the nucleus.
Based on the above, S will have a smaller radius and one more proton than P
Ans:A)
This food chain is incomplete. Two groups of organisms are missing. One group of organisms that is missing are the producers, plants and other photosynthetic organisms. They turn sunlight into chemical energy. What is the other missing group and what do they do? A) Carnivores that eat only meat. B) Herbivores that eat only plants. C) Predators that prey on all other levels of consumers. D) Decomposers that recycle matter back into the food chain.
The other missing group in the food chain mentioned is 'Decomposers'. They break down dead organisms and waste materials into basic nutrients which return to the soil, supporting the growth of producers like plants.
Explanation:Yes, the other missing group in this incomplete food chain is indeed the Decomposers. Decomposers, which include bacteria, fungi, and certain types of insects and worms, perform a crucial role in the food chain. They break down dead animals, plants, and waste materials, converting them back into basic nutrients and matter. This process of recycling matter allows these nutrients to return to the soil, which, in turn, supports the growth of producers like plants.
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How does a nuclear power plant produce electricity?
A. Quickly moving neutrons coming out of the reaction create a gas which turns a turbine that produces electricity.
B. Quickly moving neutrons coming out of the reaction are slowed down by water. The water heats up and turns into steam. The steam turns the turbine and produces electricity.
C. Quickly moving neutrons coming out of nuclear reactions are used to turn turbines that produce electricity.
D. Quickly moving neutrons give their kinetic energy to the surrounding water. The water's energy is then used to turn turbines and produce electricity.
The Answer Is B.Quickly moving neutrons coming out of the reaction are slowed down by water. The water heats up and turns into steam. The steam turns the turbine and produces electricity.
which of the following why use approximately represent the number of atoms in one mole of gold
A. 3.26 x 1026
B. 2.30 x 106
C. 12.04 x 1024
D. 6.02 x 1023
It would take one light year to travel to the sun?
True or false?
which of these statements does not refer to radiation
A. some of this energy is is reflected off earths atmosphere
B.warm air rises and takes heat with it eventually it cools and sinks
C.sunlight travels through space without aid of fluids or solids
D.land and ocean absorb and re-emit heat from the sun
Please help quick
The answer is: B.warm air rises and takes heat with it eventually it cools and sinks.
Solar radiation is the source of electric energy.
The thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter.
Heat spontaneously flows from a hotter to a colder body.
The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
Radiative zone is around the inner core and in this area energy is transported by radiation.
Answer: B.warm air rises and takes heat with it eventually it cools and sinks
Explanation: There are three modes of heat transfer:
1. Conduction: This type of heat transfer happens when there is direct contact between the two object.
2. Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) in which convection currents are produced due to the movement of hot fluid upwards and cold fluid downwards. This happens as the density of hot fluid decreases and thus it moves upwards.
3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.
Warm air rises and takes heat with it eventually it cools and sinks is an example of convection and not radiation.
How can humans decrease the rate of endangered or extinct species? Question 4 options: Introduce new predators to an environment. Minimize habitat destruction. Pollute other environments. Create and populate more zoos.
The answer is B: Minimize Habitat Destruction
Will give brainliest. ______ record the shape and structures of an organism.
A.Trace fossils
B.Body fossils
C.Bone fossils
D.Cast fossils
Fossils are the preserved remaining, impressions or traces of prehistoric organisms.
Trace fossils are the naturally preserved evidence of animal activity like footprints of animals.
Body fossils are formed from the remaining of dead animals and plants like bones, teeth etc.
Bone fossils are the remaining of bones.
Cast fossils are formed by hardening of mud or sand that is filled in the mold and thus gives the shape of the organism
Thus, option D that is cast fossils record the shape and structures of an organism.
Should people make changes to chemical compounds? This is an opinion question I'm curious of what you guys think!
Which letter is closest to the warm front, and which is closest to the cold front
When sugar and iron filings are mixed together, you can separate them using a magnet. When sugar and iron filings are mixed and then heated until a chemical reaction occurs, you can A) still separate the iron filings with a magnet. B) no longer separate the iron filings with a magnet. C) sift the mixture to separate out the sugar from the iron. D) dissolve the sugar in water to separate it from the iron.
Answer:
The answer is D. dissolve the sugar in water to separate it from the iron.
Explanation:
hope this helps :)
The component from a mixture can be separated using some methods based on the individual properties.The heating iron and sugar will lead a chemical change and they cannot be separated then using a magnet or by dissolving in water.Thus option B is correct.
What is magnetic separation?Some components which are magnetically susceptible can be separated from a mixture . Especially materials containing iron can be separated using a magnet.
During a chemical change, chemical bonds will break and form new products. Heating will make a material undergo some chemical changes. When iron and sugar are heated they both melt if higher temperature is applied.
Iron forms compound with sugar molecules, thus it cannot be separated using a magnet after heating. Both iron and sugar are soluble in water. Therefore, separation by dissolving in water is possible here. Hence option B is correct
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How much Ca3(PO4)2(s) could be produced in an industrial process if 55.00g of CaCl2 In solution reacted completely wth sufficient Na3(PO4)(aq)
If 55g of CaCl2 reacts completely with sufficient Na3PO4, approximately 232.5 g of Ca3(PO4)2 could be produced in an industrial process.
Explanation:To calculate how much Ca3(PO4)2 could be produced, we need to first know the reaction between CaCl2 and Na3PO4. The balanced equation for this reaction is:
2CaCl2 (aq) + Na3PO4 (aq) -> 3Ca3(PO4)2 (s) + 6NaCl (aq)
From this, we can see that 2 moles of CaCl2 react to form 3 moles of Ca3(PO4)2.
Now let's use stoichiometry to do the calculation. First, calculate the number of moles of CaCl2. The molar mass of CaCl2 is approximately 111 g/mol, so 55g of CaCl2 is about 0.5 moles.
According to the balanced equation, 0.5 moles of CaCl2 will produce 0.75 moles of Ca3(PO4)2. The molar mass of Ca3(PO4)2 is about 310 g/mol, so 0.75 moles of Ca3(PO4)2 is about 232.5 g.
In conclusion: If 55g of CaCl2 reacts completely with sufficient Na3PO4, approximately 232.5 g of Ca3(PO4)2 could be produced in an industrial process.
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how many grams of NA required to react with 75.0 gramsof CL2?
Relate metallic bonds to the properties of metals.
Metallic bonds contribute to the characteristic properties of metals such as electrical and heat conductivity, malleability, ductility, luster, high melting points, and density due to the free movement of valence electrons and the strong attraction between metal ions and these electrons.
Explanation:The Relationship Between Metallic Bonds and Metal Properties
Metallic bonds are the force of attraction between positively charged metal ions and the valence electrons that surround them. This creates a lattice-like structure where electrons are free to move. This electrical conductivity is due to electrons being able to flow through the metal, allowing it to carry an electric current. Similarly, the close packing of positive nuclei in metals enables efficient heat conduction.
Metallic bonds also give metals their malleability (the ability to be hammered into sheets) and ductility (the capacity to be stretched into wires), because the layers of atoms can slide past each other without breaking the metallic bonds. The sharing of valence electrons among a sea of metal ions also accounts for the metals' characteristic luster, as electrons absorb and re-emit light energy.
Due to the strength of the metallic bonds, metals typically exhibit high melting points. The tight packing of the atomic structure, resultant from these bonds, also explains the high density commonly associated with metallic substances. Furthermore, metals often form cations in compounds due to the ease with which they can lose valence electrons, a trait that is tied to their metallic bonding nature.
Metallic bonds form a 'sea of electrons' that accounts for the unique properties of metals. This includes high electrical and thermal conductivity, malleability, ductility, and metallic lustre. Examples of metals with these properties are aluminum, copper, and iron.
Metallic Bonds and Properties of Metals:
Metallic bonds are formed between metal atoms due to the unique electronic structure of metals. These bonds are characterized by a 'sea of electrons' where valence electrons are free to move around the fixed cations. This freedom of electrons accounts for various properties of metals.
High electrical conductivity: The free-moving electrons allow metals to easily conduct electricity.High thermal conductivity: Metals can efficiently transfer heat because of the same free electrons.Malleability and ductility: The ability to move and rearrange without breaking bonds allows metals to be hammered into sheets and drawn into wires.Metallic lustre: The movement of electrons gives metals their shiny appearance.High melting points and density: Strong bond interactions contribute to these properties.Examples include aluminum, copper, and iron, each demonstrating these characteristic features due to metallic bonding.
Calcium and sulfur ionic compound or non ionic?
Final answer:
Calcium and sulfur combine to form the ionic compound calcium sulfide, written as CaS, due to the metal calcium cation combining with the nonmetal sulfur anion to balance the charges.
Explanation:
A compound consisting of calcium and sulfur forms an ionic compound. Calcium is a group 2 element and forms a calcium cation (Ca2+), while sulfur is a group 16 element and forms a sulfide anion (S2-). In an ionic compound, the total charge of the cations and anions must be equal. Therefore, one calcium ion will combine with one sulfur ion to form the compound calcium sulfide, which is written as CaS. This compound is ionic because it consists of a metal (calcium) and a nonmetal (sulfur) element.
Find the pressure, in atmosphere, exerted by a mixture which contains three gases with partial pressures of 448 torr, 321 mm Hg and 1.72 atm
What happens when the temperature of an object increases?
A. The object's particles move closer together.
B. The object's particles stop moving.
C. The number of the object's particles increases.
D. The object's Particles move faster.
how many molecules of CaCl2 are equivalent to 75.9 g CaCl2
KCl(aq) + AgF(aq) → AgCl(s) + KF(aq)
If 0.25 moles of potassium chloride are consumed completely, how many moles of potassium fluoride will be produced?
A)
1.0 mole
B)
0.25 moles
Eliminate
C)
0.50 moles
D)
There is no way to tell because we do not have enough information
It is the same answer as in the question so the answer is b
What is the difference between a seismograph and seismogram?
A) A seismograph is an instrument that records movements within the earth. A seismogram is an instrument that monitors the earth's core.'
B) A seismograph is an instrument that records movements within the earth. A seismogram is the actual recording that scientists look at when studying earthquakes.
C) A seismograph is an instrument that monitors the earth's core. A seismogram is an instrument that records movements within the earth.
D) A seismograph is the actual recording that scientists look at when studying earthquakes. A seismogram is an instrument that records movements within the earth.
Q 2)
Which word describes the nature of the inner core of the earth?
A) Plastic
B) Solid
C) Liquid
D) Gaseous
A seismograph is an instrument that detects and records the vibrations caused by earthquakes, while a seismogram is the recorded data or output from a seismograph. The inner core of the Earth is solid due to the immense pressure that forces atoms closely together, despite the high temperatures.
Explanation:The key difference between a seismograph and a seismogram lies in the role they play in studying seismic activity. A seismograph is an instrument that records movements within the Earth, measured by the intensity and duration of earthquakes. It essentially measures the vibrations caused by an earthquake. On the other hand, a seismogram is the actual recording produced by a seismograph. It is the visual output, typically a graph or chart, that scientists look at when studying earthquakes.
As for your second question, the inner core of the Earth is described as solid. Despite the extremely high temperatures, the immense pressure at the core forces atoms closely together, resulting in a solid state.
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Suppose a grill lighter contains 50.0 g of butane. How many grams of butane in the lighter would have to be burned to produce 17.9 L of carbon dioxide at STP
Answer is: mass of burned butane is 11.6 g.
Chemical reaction: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.
m(butane) = 50,0 g.
V(CO₂) = 17,9 L.
n(CO₂) = V(CO₂) ÷
Vm.
n(CO₂) = 17,9 L ÷ 22,4 L/mol.
n(CO₂) = 0,8 mol.
From chemical reaction n(CO₂) :
n(C₄H₁₀) = 8 : 2.
n(C₄H₁₀) =
0,8 mol ÷ 4.
n(C₄H₁₀) =
0,2 mol.
m(C₄H₁₀) =
n(C₄H₁₀) · M(C₄H₁₀).
m(C₄H₁₀) =
0,2 mol · 58 g/mol.
m(C₄H₁₀) =
11,6 g.
Heat is an exchange of internal energy from one system to another due to
A. a temperature difference between the systems.
B. one system being gas and the other being solid.
C. the systems having the same temperature.
D. one system being liquid and the other being solid.
This is ether physics or chemistry i don't know
I WILL GIVE BRAINLIEST!!!!!!!!!!!!!! Hanson is designing an experiment to test the porosity of a soil sample. His experiment involves the following:
Place the soil sample in a water-tight container.
Slowly pour water into the container.
Measure the volume of water that the soil absorbs.
Which of the following would improve Hanson's experiment?
A.if he measured the volume of the soil beforehand**
B.
if he measured the mass of the water beforehand
C.
if he measured the porosity of the water beforehand
D.
if he measured the mass of the soil beforehand
a 15.0 kg chunk of ice falls off the top of an iceberg if the chunk of ice Falls 8.00 to the surface of the water what is the kinetic energy of the chunk of ice when it hits the water and what is its velocity how do you work that out
The 15.0 kg chunk of ice, falling 8.00 meters, hits the water with a velocity of approximately 12.52 m/s and has kinetic energy of about 1176 joules.
To determine the kinetic energy and velocity of a 15.0 kg chunk of ice falling from a height of 8.00 meters, we can use the principles of physics.
Velocity Calculation:
We use the formula for the final velocity of a freely falling object:
v = √(2gh)
where:
v is the final velocityg is the acceleration due to gravity (9.8 m/s2)h is the height (8.00 meters)Substitute the values:
v = √(2 * 9.8 m/s2 * 8.00 m) = √(156.8) ≈ 12.52 m/s
Kinetic Energy Calculation:
The kinetic energy (KE) can be calculated using the formula:
KE = 0.5 * m * v2
where:
m is the mass (15.0 kg)v is the velocity (12.52 m/s)Substitute the values:
KE = 0.5 * 15.0 kg * (12.52 m/s)2 = 0.5 * 15.0 * 156.8 ≈ 1176 J
So, the chunk of ice has a kinetic energy of approximately 1176 joules and a velocity of 12.52 m/s upon hitting the water.
jordan's puppy has a mass of 5480 milligrams , what is the puppy's mass in grams ?
Final answer:
To convert the mass of Jordan's puppy from milligrams to grams, divide the mass in milligrams by 1000. The puppy has a mass of 5.48 grams.
Explanation:
To convert the mass of Jordan's puppy from milligrams to grams, we need to divide the mass in milligrams by 1000. This is because there are 1000 milligrams in 1 gram.
So, to convert 5480 milligrams to grams, we divide 5480 by 1000:
5480 mg ÷ 1000 = 5.48 g
Therefore, Jordan's puppy has a mass of 5.48 grams.
is wood a compound, element or mixture
Without the process of transpiration, what might happen to a plant?
A.
It might turn orange.
B.
It would grow more slowly.
C.
It would have fewer leaves.
D.
It might burst.
Transpiration is the process of release of water from the plants. In the absence of transpiration, the plant bursts. Thus, option D is correct.
How the process of transpiration takes place?The transpiration process is the release of water from the plants through stomata. The pressure of water allows the movement of the stomatal guard cell, and the stomata opens.
The opening of stomata releases the water inside the plants, and release of pressure results in the relaxation of stomata, thereby closing the stomata.
The absence of transpiration in plants results in the accumulation of water inside the body. The access water in the body exerts the force to the plant body, and it may burst.
Therefore, in the condition of loss of transpiration by the plants, the plant may burst out. Thus, option D is correct.
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how many moles of sodium are needed to react with sulfuric acid to produce 3.75 moles of sodium sulfate according to the following unbalanced reaction :
Protozoan infection is not likely to be transmitted by:
dog bite
direct contact
breathing
eating
Answer:
breathing
Explanation: