Which metal is more active than H2?
(1) Ag (3) Cu
(2) Au (4) Pb
Answers
Answer is (4) - Pb.
According to the reactivity series of elements
- the elements which are above the hydrogen are more reactive than hydrogen.
- the elements which are below the hydrogen are less reactive than hydrogen.
Among the given choices, only Pb is placed above the hydrogen in the reactivity series and rest are below the hydrogen.
Hence, Pb is more active than hydrogen.
Related Questions
Calculate the mass percent of hydrogen in diethyl ether. Round your answer to the nearest percentage.
A neutral charge by an atom is caused by which of the following conditions? a. presence of neutrons in the nucleus b. balance in number of protons and neutrons c. balance in number of electrons and protons d. the balance of electrons in each electron shell
What is the rroooooooooooooooo
2H2 + O2 ---> 2H2OHow many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?A.) 6.8 molB.) 13.7 molC.) 54.8 molD.) 109.6 mol
Answers
Answer:
a salt
Explanation:
compounds are made of molecules but we need to mention the type of compound formed.
Answer:
A salt
Because compounds are made of molecules but we need to mention the type of compound formed.
Answers
Answer:
- There are 14 protons (Z) and 14 neutrons (N) in a nucleus of the most common isotope of silicton.
Explanation:
The notation of the most common isotope of silicon is:
The superscript, 28, to the left of the chemical symbol, Si, is the mass number, usually identified with the symbol A, and it is the sum of the protons and neutrons.
The subscript, 14, to the left of the chemical symbolr, Si, is the atomic number, Z, which is the number of protons.
Then, you have this equation:
- mass number = number of protons + neutrons, or, in symbols:
- A = Z + N
The number of protons is the same for any isotope of the same element. This is, all the isotopic forms of silicon have the same number of prtons: 14
The number of neutrons is determined from the equation A = Z + N, solving for N:
- N = A - Z = 28 - 14 = 14.
Hence, the most common isotope of silicon has 14 protons and 14 neutrons.
B) unequal heating of different parts of earth
C) differences in elevation on different landmasses
D) greenhouse gases
(no guessing please )
Answers
sometimes the earths heating of the surface is unequal forming global wind patterns
Answers
1. Double-Replacement reactions
2. Decomposition
3. Combustion
4. Syntesis
5. Single replacement
Further explanation
Given
Chemical equations
Required
Type of reaction
Solution
1. 2AgNO₃ + MgCl₂ ⇒ 2AgCl + Mg(NO₃)₂
Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant
2. 2KBr⇒2K +Br₂
Decomposition
Single compound breaks down in to 2 or more products
3. C₃H₈ + 5O₂ ⇒ 4H₂O + 3CO₂
Combustion
Hydrocarbon and Oxygen reaction and form water and carbon dioxide
4. NaO + H₂O ⇒ NaOH
Syntesis
2 or more reactants combine to form a single product
5. Zn + CuCl₂ ⇒ZnCl₂ + Cu
Single replacement
One element replaces another element from a compound
Answers
Answer:
The answer to your question is photon. An isotope remains unchanged by the emission of a gamma ray, which is a (an) photon123. A photon is a particle of light or electromagnetic radiation that has no mass and no electric charge4. A gamma ray is a type of photon that has the highest energy and frequency in the electromagnetic spectrum4. Gamma rays are emitted by the nuclei of some radioactive atoms when they undergo a nuclear rearrangement or decay4. Gamma ray emission causes no change in the number of particles in the nucleus, meaning both the atomic number and mass number remain the same23. Therefore, an isotope does not change its identity or mass when it emits a gamma ray, but only releases some excess energy as a photon. I hope this answer helps you understand the concept of gamma ray emission better.