Using the periodic table and your knowledge of atomic structure. cobalt (Co) and nickel (Ni) have almost identical atomic mass numbers. Comparing nickel and cobalt from the periodic table, which statement best describes the atoms?A. Nickel has one more neutron.
B. Both atoms will have the same number of protons.
C. Both atoms will have the same number of neutrons.
D. Cobalt has one less proton.
Answers
Answer:
Cobalt has one less proton.
Explanation:
Nickel and Cobalt both has almost same atomic mass number approximately 59 but has different atomic number.
Number of proton and electrons in an atom is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Case 1: Cobalt
Atomic mass number = 59
Atomic number = 27
Number of proton and electrons in Nickel is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of proton = 27
Number of proton = 27
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Number of neutrons = 59 - 27
Number of neutrons = 32
Case 2: Nickel
Atomic mass number = 59
Atomic number = 28
Number of proton and electrons in Nickel is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of proton = 28
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Number of neutrons = 59 - 28
Number of neutrons = 31
Cobalt has one less proton.
Thus, Option D is correct.
Answer: The correct answer is option D.
Explanation:
Cobalt and Nickel both are transition metals which means that their last electron enter d-orbitals.
These two elements have similar atomic masses but differ in the atomic number.
Atomic number is equal to the number of protons or electrons present in that element.
Atomic number = number of protons = number of electrons
Atomic Mass is the sum of protons and neutrons in an element
Atomic mass = Number of protons + Number of neutrons
- For Cobalt:
Atomic Number = 27
Number of protons = 27
Atomic mass = 59
Number of neutrons = 59 - 27 = 32
Hence, Number of protons in this element is 27 and number of neutrons are 32.
- For Nickel:
Atomic Number = 28
Number of protons = 28
Atomic mass = 59
Number of neutrons = 59 - 28 = 31
Hence, Number of protons in this element is 28 and number of neutrons are 31.
- From the above information, it is visible that cobalt has one less proton that the nickel.
Hence, the correct answer is option D.
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What is the frequency of radiation emitted by a photon of light if the energy released during its transition to ground state is 3.611 × 10-15 joules? (Planck's constant is 6.626 × 10-34 joule seconds) 5.50 × 10-11 Hz 2.39 × 10-50 Hz 5.45 × 1018 Hz 1.633 × 1027 Hz
Answers
Answer: Biomass energy is the use of the organic materials to generate electricity.
Explanation:
Biomass is the fuel. It is developed from the organic materials. It is renewable and sustainable source of energy. Like sugarcane, corn etc. They are used to create bio fuels.
Biomass energy is the use of the organic materials to generate electricity. The energy is produced by burning the organic material that comes from plant and animal.
Answers
Answer:
4) 6m
Explanation:
Wavespeed = velocity(18) divided by frequency(3)
Therefore the answer is 6.
111.5 newtons
684.1 newtons
4041.7 newtons
Answers
F = GMm/r²; where G is the gravitational constant, M is the larger mass, m is the smaller mass, and r is the distance between the two.
F = (6.673 × 10⁻¹¹ × 5.98 × 10²⁴ × 70) / (6.39 × 10⁶)²
F = 684.1 N
F = (6.673*10^-11)(5.98*10^24)(70)/(6.39*10^...
F = 684 N (3sf)
B. The flask would probably feel warmer than before the reaction started.
C. The flask would feel the same as before the reaction started.
D. none of the above
Answers
Answer: A. The flask would probably feel cooler than before the reaction started.
Explanation: An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surroundings. The temperature of the surrounding decreases.
An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.
When an endothermic reaction takes place in the flask, the heat is absorbed by the flask and thus the temperature of the surrounding (here the flask) will decrease which can be felt by touching the outside of the test tube. Thus the flask would appear colder.
CCA Unit 3: Heat Energy and Reactions Unit Test Answers
Please keep in mind these are for CHECKING YOUR ANSWERS, not for using as an answer key to cheat!!
1. A
2. C
3. A
4. A
5. C
6. D
7. C
8. C
9. A
10. A
11. C
12. A
13. C
14. C
15. C
16. B
17. D
18. B
19. Q= = mass * specific heat * delta T 343 = 55.0 * specific heat (86.0-19.0) 343=3685 * specific heat specific heat = 0.0931 cal/g Celsius
20. Temperature is absolute while heat is relative. The direction of heat always travels to the warmer temperature of the object to the cooler one.
21. Ke=[C]^2/[A]^3[B}^2
22. A chemical reaction is spontaneous if an increase in the total entropy of the system and surroundings accompanies it.
Example:
4 Fe + 3 O 2 -> Fe 2 O 3
Enjoy guys ;)
Answers
By definition, we have to:
Calcium Bromide is an inorganic salt formed by granular white crystals that responds to the formula CaBr2.
Calcium bromide has no odor, is colorless and has a bitter taste.
It is obtained by adding Hydrobromic Acid to Calcium Oxide, Calcium Carbonate or Calcium Hydroxide.
The substance that results is then subjected to a crystallization process, which involves evaporating the water.
From here, you get then:
CaBr2.
Answer:
CaBr2 = Calcium bromide.
Answer:The name of the compound made from calcium and bromine is calcium bromide.
Explanation:
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
Hence, the name of is calcium bromide.
Answers
Explanation:
To determine which force does more work, we can calculate the work done by each force using the formula:
Work = Force × Distance
For the first scenario:
Work = 500 N × 10 m = 5000 N·m
For the second scenario:
Work = 100 N × 40 m = 4000 N·m
Therefore, the force of 500 N moving through 10 m does more work, with a total of 5000 N·m.