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avanturin [10]
3 years ago
7

Picture of chart is added. Please help and answer this question i will mark brainliest if question is answered correctly. Would

really appreciate it!! :)
Which of these statements best explains the identity of reaction D?

A) It is a nuclear reaction because the atomic number remains the same when the number of valence electronsithanges.
B)It is a nuclear reaction because the atomic number remains the same when the particles are emitted from the nucleus.
c)It is a chemical reaction because the atomic number remains the same when the number of neutrons and protons changes.
D)It is a chemical reaction because the atomic number remains the same for all elements while a rearrangement of atoms through bonding occurs.

Chemistry
1 answer:
Rudiy273 years ago
7 0

Answer: C

Explanation: I had the same question and it was C

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How many molecules of malic acid (C4H6O5), an acid found in apples and other fruits, are there in 1.25 g
Tcecarenko [31]

Answer:

5.61 * 10²¹ molecules

Explanation:

You have 1.25 g of malic acid, C4H.Os, an acid found in apples and other fruits. How many molecules of the acid do you have?

Solution:

A molecule is the group of two or more atoms held together by chemical bonds.

The number of molecules is calculated using the formula:

number of molecules in a substance = number of moles of substance * Avogadro constant

Avogadro constant = 6.02 * 10²³ mol⁻¹

number of moles = mass / molar mass

Given that mass = 1.25 g

molar mass of malic acid (C₄H₆O₅) = (12 * 4) + (1 * 6) + (16 * 5) = 48 + 6 + 80 = 134 g/mol

number of moles = mass / molar mass = 1.25 g / 134 g/mol = 0.0093 mol

Recall that: number of molecules in a substance = number of moles of substance * Avogadro constant

number of molecules in a substance = 0.0093 mol * 6.02 * 10²³ mol⁻¹ = 5.61 * 10²¹ molecules

8 0
4 years ago
All the atoms contain neutron, except<br> A. Oxygen<br> B. Nitrogen<br> C. Hydrogen<br> D. Chlorine
Slav-nsk [51]

Answer:

C.Hydrogen

Explanation:

The hydrogen atom contains 1 proton and 1 electron, but no neutrons.

6 0
3 years ago
Read 2 more answers
Which statement best describes the structure of covalent network solids? A. They are giant structures held together by weak forc
konstantin123 [22]

Answer: Option (B) is the correct answer.

Explanation:

A covalent compound is a compound formed by sharing of electrons. And, in a covalent network solid atoms are bonded by covalent bonds in a continuous network that is extending throughout the material or solid.

This continuous arrangement of atoms are like a lattice.

For example, diamond is a covalent network solid in which carbon atoms are arranged in a continuous lattice like structure.

Hence, we can conclude that the statement all the atoms are covalently bonded to other atoms to form a lattice-like structure, best describes the structure of covalent network solids.

6 0
3 years ago
In some places there are deep cracks in earths crust called
Leona [35]
I think they are called Faults.
7 0
3 years ago
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Please help me I don’t understand this !!!
alexira [117]

Answer:

The real answer for a is-He(helium)4,002602

The answer for b is-Mg(Magnesium) 24.305

3 0
3 years ago
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