1.is the smallest chemical unit of a type of pure substance A) An atom B) A prot
ID: 302431 • Letter: 1
Question
1.is the smallest chemical unit of a type of pure substance A) An atom B) A proton C) A molecule D) An amino acid E) A cell 2. The nucleus of an atom is usually made up of protons, neutrons, and proteins that hold them together. protons, which have a positive electrical charge, and proteins, which hold them together. neutrons, which have no electrical charge. neutrinos, which have no electrical charge. protons, that which a positive charge, and neutrons, which have no electrical charge. A) B) C) D) E) 3. The number of protons in an element, also called its , identifies the element. A) nucleus B) atomic number C) ion D) charge E) atomic weight A) a neutron. B) an orbital shell. C) an electron. D) a proton. E) an isotope.Explanation / Answer
Q. 1.
Answer is A) An atom
An atom is the smallest unit of matter that has property of chemical element.
Q.2.
Answer is E) Protons, that which a positive charge, and neutrons, which have no electrical charge.
An atom consists of electron, proton and neutron. Proton and neutron are found in nucleus part of the atom while electrons are at outside the nucleus.
Q. 3.
Answer is B) Atomic number.
The number protons in an atom is the atomic number of that element, example Hydrogen is having 1 atomic dumber and it has 1 proton in its nucleus.
Q.4.
Answer is C) an electron
Addition of an electron or removing of an electron from an atom makes it as an ion form. Like HCl = H+ + Cl- , after loosing of one electron from hydrogen and after gaining of electron in calcium become in ionized form.
Q. 5.
Answer is B) Covalent bonds, ionic bonds and hydrogen bonds
These three bonds are the basic principle type of bonds which can hold multiple atoms together.
Q.6.
Answer is A) in covalent bonds two atoms share electrons while in ionic bonds two atoms of opposite charge are attracted to each other.
Covalent bond is a chemical bond that is formed by sharing of electrons between two atoms, while ionic bonds that involve electrostatic attraction between the oppositely charged atoms
Q.7.
Answer is C) Hydrogen bonds
Water molecules connected to other water molecules by hydrogen bonds
Q.8.
Answer is B) how acidic or basic it is
The pH of a fluid is a measure of the molar concentration of hydrogen ions in the solution, it gives measure of the acidity or basicity of the fluid.
Q.9.
Answer is E) a) and b) are both true
A buffer is a chemical that can resist pH change upon the addition of an acidic or basic substance.
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