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- Question
What is a product in a chemical reaction?
- Correct Answer
- In chemistry, a product is a substance that is formed as the result of a chemical reaction In a reaction, starting materials called reactants and the ending materials are called products
- 1. Chemical name of Gold?
Options- A. Argentinum
- B. Ferrus
- C. Aurum
- D. Selenium Discuss
- 2. Iron rusting, chemical or physical change
Options- A. Chemical
- B. Physical
- C. Both A & B
- D. None of the above Discuss
- 3. Which statement is true of all atoms that are anions?
Options- A. The atom has fewer protons than does a neutral atom of the same element.
- B. The atom has more protons than electrons.
- C. The atom has more neutrons than protons.
- D. The atom has more electrons than protons. Discuss
- 4. The reactivity of an atom arises from
Options- A. the existence of unpaired electrons in the valence shell
- B. the energy differences between the electron shells
- C. the sum of the potential energies of all the electron shells
- D. the average distance of the outermost electron shell from the nucleus Discuss
- 5. Water is an example of?
Options- A. Element
- B. Molecule
- C. Compound
- D. Both B & C Discuss
- 6. Which of the following is a micro nutrient?
Options- A. Mg
- B. Cl
- C. P
- D. Ca Discuss
- 7. What does the Aufbau Principle state
Options- A. Electrons will be added to an atom starting from the lowest possible level or sublevel.
- B. Electrons will be added to an atom only if the orbitals are different colors.
- C. Electrons will be added to an atom in a random order.
- D. Electrons will be added to an atom in a symmetrical manner. Discuss
- 8. What is the conjugate base of H2O?
Options- A. NH3+
- B. OH-
- C. H2O
- D. All the above Discuss
- 9. A disaccharide is formed by the chemical bonding of
Options- A. two monosaccharides
- B. two polysaccharides
- C. one monosaccharide and one polysaccharide
- D. All the above Discuss
- 10. Which compound contains ionic bonds?
Options- A. CaO
- B. CO2
- C. NO2
- D. NO Discuss
Chemistry problems
Search Results
Correct Answer: Aurum
Explanation:
The Chemical name of Gold is Aurum with symbol Au with atomic number 79 and a group 11 element. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.
Chemically, gold is a transition metal.
Correct Answer: Chemical
Explanation:
In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.
The rusting of iron is a chemical change because it is two substances reacting together to make a new substance.
Correct Answer: The atom has more electrons than protons.
Explanation:
Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge.
Correct Answer: the existence of unpaired electrons in the valence shell
Explanation:
When atoms react they do so in order to reach the lowest energy, which is the most stable. The electrons orbitals will overlap in the way that reduces the energy the most. Orbitals of similar energy will produce the greatest stabilisation.The answer you gave isn't the whole story, it depends what species is reacting with what. The effective nuclear charge on the atom will affect the energy of the valance electrons.
Hence, the reactivity of an atom arises from the existence of unpaired electrons in the valence shell.
Correct Answer: Both B & C
Explanation:
Why Water Is Not an Element :
An element is a substance consisting of only one type of atom. Water consists of two types of atoms: hydrogen and oxygen.
water is both a molecule and a compound :
A compound forms whenever two or more atoms form chemical bonds with each other. The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms.
Thus, water is a compound.
It's also a molecule, which is any chemical species formed by two or more atoms chemically bonded to each other. The terms molecule and compound mean the same thing and can be used interchangeably.
Hence, water is both a molecule and a compound.
Correct Answer: Cl
Explanation:
The micronutrients (or trace minerals): boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni). and cobalt (Co).
Correct Answer: Electrons will be added to an atom starting from the lowest possible level or sublevel.
Explanation:
The Aufbau Principle states that in the ground state of an atom, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies.
Correct Answer: OH-
Explanation:
A conjugate acid, is a species formed by the reception of a proton (H+) by a base?in other words, it is a base with a hydrogen ion added to it.
On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. Hence, a conjugate base is a species formed by the removal of a proton from an acid.
Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic.
Represented as the following chemical reaction:
Acid + Base ? Conjugate Base + Conjugate Acid
The water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen proton donated by ammonium. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule. We can also refer to OH- as a conjugate base of H2O, since the water molecule donates a proton towards the production of NH+4 in the reverse reaction, which is the predominating process in nature due to the strength of the base NH3 over the hydroxide ion.
Correct Answer: two monosaccharides
Explanation:
Disaccharides are formed when two monosaccharides join together by the dehydration synthesis reaction resulting in a glycosidic bond between the two monosaccharide molecules. The reaction produces water as a side product.
Correct Answer: CaO
Explanation:
An ionic bond is a chemical bond between two atoms in which one atom seems to donate its electron to another atom.
Here in the given compounds, the compound that contains ionic bond is CaO, Calcium oxide.
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