Atoms from which two elements would form ionic bonds
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Answer:
Explanation:
Ionic bonds are formed by transfer of electrons between metal and non metals. Electronic configuration of calcium: Calcium atom will lose two electron to gain noble gas configuration and form calcium cation with +2 charge.
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You start to roll backwards down a hill on your bike, so you use the brakes to stop your motion. In what direction did you accelerate?
E. If you knew the pressure, volume, and temperature of the helium in the balloon, what equation would you use to determine its number of moles? (2 points)
F. Your friend's mom has a great new car. What type of device does it use to move? Describe how this device operates, in terms of the second law of thermodynamics. (3 points)
G. The heat is getting to your friend. You start to share your iced drink with her, but the ice has disappeared! What phase change did the ice cubes undergo? What happened to the ice's molecules during this phase change? If the drink continued to heat, what would be its next phase change? (3 points)
H. Did the entropy of the ice cubes increase or decrease over time? Explain your answer, including a definition of entropy. (3 points)
6.A. The following is a nuclear equation for which type of decay process? (1 point)
235 92 U --> 4 2 He + 231 90 Th
B. Describe this type of decay process. What are the other two types of decay? How are the types of decay different? (4 points)
C. What is the name for the length of time of a decay process? How can this be used to calculate the amount of a radioactive element, compared to its original amount? (4 points)
7.A. Describe Einstein's famous equation, E = mc2, using two well-known conservation laws. Give an example of when you would use this equation. (4 points)
B. Describe fission and fusion. Explain how Einstein's equation relates to the concepts of fission and fusion. (5 points)
8. Describe an alternative energy source that involves the earth. (2 points)
Answers
where p is the gas pressure, V is the gas volume, n is the number of moles, R is the gas constant and T the gas temperature. Since we know p,V and T of the gas, we can find the number of moles n by re-arranging the equation:
F) The car uses an internal combustion engine. In an internal combustion engine, the fuel (gasoline) burns releasing heat, which moves the pistons of the engine. The motion of the pistons is then converted into motion of the wheels of the car.
The second law of thermodynamics states that the entropy of an isolated system can never decrease. If we take the engine as an isolated system, the this law applied also to it. In fact, at the beginning the engine containes fuel, which has a certain degree of "order" (entropy). When the fuel burns, the chemical bonds of the fuel are converted into heat, which has a higher degree of "disorder" (=more entropy) than the initial state.
G1) The ice cubes in the drink undergo melting: they go from solid state into liquid state (water).
G2) Since the temperature of the ice cubes is lower than the temperature of the surrounding liquid drink, the drink releases heat to the ice cubes. This heat makes the molecules of the ice cubes to vibrate faster and faster, eventually breaking the bonds between the molecules. When this occurs, the ice cubes start melting.
G3) If the drink continues to heat, it will undergo evaporation, which is the transition between the liquid state and the gas state. This transition occurs when the energy given to the molecules of the drink is large enough to remove the intermolecular forces between the molecules of the liquid, allowing them to escape from each other.
H) Entropy is the amount of thermal energy of a system (per unit temperature) which cannot be used to do work. In practise, the entropy of a system gives a measure of the degree of "disorder" of a system. When the ice cubes melt, the entropy of the system (the ice cubes) increases, because they move from a state with higher degree of "order" (the solid state) to a state with lower degree of "order" (the liquid state).
A) This nuclear equation is an example of alpha-decay, where an unstable nucleus (uranium-235) decays into a daughter nucleus (thorum-231) releasing an alpha particle (a nucleum of helium, consisting of 2 protons and 2 neutrons).
B) The other three types of decay are:
- beta minus decay: in an unstable nucleus, a neutron decays into a proton, releasing a fast moving electron and an antineutrino. Following this decay, the atomic number of the nucleus increases by 1 unit while its mass number remains the same
- beta plus decay: in an unstable nucleus, a proton decays into a neutron, releasing a fast moving positron and a neutrino. Following this decay, the atomic number of the nucleus decreases by 1 unit while its mass number remains the same
- gamma decay: a nucleus in excited states decays to its ground state by emitting a gamma photon, whose energy is equal to the difference in energy between the two nuclear levels.
C) The length of time of a decay process is usually expressed by using the concept of half life. The half life of a substance is the time it takes for the substance to decrease to half of its original amount. The equation that gives the amount left of a substance at time t is given by:
where m0 is the original mass of the substance,and
7B1) In nuclear fusion, two smaller nuclei combine together (fuse) to form a new larger nucleus. An example of this process is the hydrogen-to-helium fusion, which occurs inside the stars, where two nuclei of hydrogen (one proton each) fuse together to form a nucleus of helium-4. In the nuclear fusion process, the sum of the masses of the initial nuclei is larger than the mass of the final nucleus, so the mass lost in the process has converted into energy, according to Einstein's formula:
7B2) In nuclear fission, a nucleus of a heavy element absorbs a slow moving neutron, becoming unstable and decaying into smaller nuclei. An example of this process is the fission of uranium-235, which occurs inside nuclear power plants on Earth. In the process, uranium-235 decays into lighter nuclei and many neutrons, which are used to further induce other fission reactions with other nuclei of uranium-235. In the nuclear fission, the mass of the initial nucleus is greater than the masses of the final products, so the mass lost in the process has been converted into energy according to Einstein's formula:
8) An alternative energy source that involves the Earth is wind power: the air flows through turbines, which are put in motion by the wind. The motion of the turbines is then converted into electrical energy.
Answers
Answer:
Legs are the 2nd class lever.
Arms are the 3rd class lever.
Explanation:
A lever is an inflexible body fit for turning on a point on itself. There are three types of lever
1) 1st class lever: (pivot is in the center of load and effort)
In the human body are uncommon. One model is the joint between the head and the principal vertebra
2) 2nd class lever: (load is in the center of pivot and effort)
In the human body, the 2nd class lever is found in the lower leg when somebody remains on tiptoes.
3) 3rd class lever: (The load is far from the pivot than the effort.)
In the human body; one model can be delineated in the elbow joint
Answers
Explains whether boron or arsenic is the dopant most likely used in the semiconductor layer marked with plus, so this layer is the emitter of a PNP transistor, so it could include boron.
What is the structure of a semiconductor?
The simplest semiconductor materials are made up of atoms of a single chemical element with four valence electrons, that is, tetravalent atoms. Two atoms, tetravalent, widely used in semiconductor materials are germanium (Ge) and silicon (Si).
P-Type - In P-type doping, boron or gallium is the dopant. Gallium boron has only three electrons and each one is external. When combined" in the silicon lattice or form "holes" "gaps in the lattice and a silicon electron has nothing to bind to".
See more about semiconductors at brainly.com/question/15184439
Answer:
D) This layer is the emitter of a PNP transistor, so it could include boron.
Got it on quiz! Good luck!
Explanation:
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Magnetic forces act at a distance. The opposites attract and pull each other closer
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Answer: The correct option is D.
Explanation:
Thermal energy is the internal energy of the object due to the motion of the particles.
The kinetic energy is due to the motion of the particles. If the system has kinetic energy then it will have thermal energy.
When the object's atoms move faster then the thermal energy increases.
Therefore, the correct answer is thermal energy.
Answers
The correct option for above statement is:
Gravity and Inertia
Explanation:
For instance, Gravity from our sun holds us at an essentially same range all the way around. It makes sure we don't sling off into the wisdom of our solar system. Inertia, keeps us in movement, if there were no inertia, our revolution would stop at a standstill. If we stayed, we would be sucked into the sun by its gravity.
Static motion is where an object moves on or around another moving object. (Circular motion)
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