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frez [133]
3 years ago
5

2. Oxygen can combine with carbon to form two compounds, carbon monoxide, and carbon dioxide. The ratio of the masses of oxygen

that combine with a given mass of carbon is 1:2. This is an example of
A.Law of Mass conservation
B.Law of Definite Proportion.
C.Law of Multiple proportions
D.None of the above

3. The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the
.A.Proton
C. Electron
B.Neutron
D. Atom

7. An atom is electrically neutral because
A.thenumberof protons and neutrons are equal.
B.the number of protons and electrons is equal.
C.neutrons balance the protons and electrons.
D. It has the same number of protons, neutrons, and electrons.

8. What happens when an ion is formed?
A. The number of protons is changed.
B. The number of neutrons is changed.
C. The number of electrons is changed.
D. The number of proton, neutron, and electron is changed

Bohr’s contribution to the development of atomic structures
A.referred to as the “plum pudding model.”
B.the discovery that electrons surround a dense nucleus.
C.proposed that electrons travel in circular orbits around the nucleus.
D.None of the above.
Chemistry
1 answer:
soldier1979 [14.2K]3 years ago
8 0
Neutron
Ghggffghhgfthvffybbjjggbj
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Classify the following reactions: HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l) Ba(OH)2(aq)+ZnCl2(aq)→BaCl2(a
Savatey [412]

The reactions are

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

Ba(OH)2(aq) + ZnCl2(aq) → BaCl2(aq) + Zn(OH)2(s)

2AgNO3(aq) + Mg(s)  →  Mg(NO3)2(aq) + 2Ag(s)

Answer:

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)   =  Acid-base reaction

Ba(OH)2(aq) + ZnCl2(aq) → BaCl2(aq) + Zn(OH)2(s)  =  Precipitation reaction

2AgNO3(aq) + Mg(s)  →  Mg(NO3)2(aq) + 2Ag(s)  =  Redox reaction

Explanation:

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)  .

The reaction above is an example of an acid-base reaction. Acid-base reaction is a chemical reaction between an acid and a base. The product is usually a salt and water. An acid dissolves in water to produce H+ ion. Hydrochloric acid is a strong acid as it is completely dissociated in water. A base dissolves in water to form hydroxide ion(OH-). The sodium hydroxide is a strong base as it completely dissociate in water. The reaction between a base and an acid can be known as a neutralization reaction.

Ba(OH)2(aq) + ZnCl2(aq) → BaCl2(aq) + Zn(OH)2(s)

The reaction above is a precipitation reaction. Precipitation reaction is a reaction where two ionic bonds or cations and anions in an aqueous solution react to form an insoluble salts. The insoluble salt formed is known as the precipitate. The reaction above is an example of a double replacement reaction. From the equation the ions replace each other depending on the cations and anions. They switch partners as both reactants lose their partners to form new partnership with a different ion. The two reactants ( Ba(OH)2 and ZnCl2 ) are aqueous solution, they react to from a solid precipitates( Zn(OH)2(s) ).

2AgNO3(aq) + Mg(s)  →  Mg(NO3)2(aq) + 2Ag(s)

The reaction is known as an oxidation-reduction reaction(Redox reaction). A oxidation-reduction reaction their is a transfer of electron(s) between two species. The oxidation number of a chemical reaction changes by losing or gaining electrons. One of the reactant is a reducing agent and the other is an oxidizing agent.

From the reaction Mg is the reducing agent and AgNO3 is the oxidizing agents.

2 Ag+  +   2 e- → 2 Ag∧0  (reduction)

    Mg∧0  -  2 e- → Mg²+ (oxidation)

8 0
3 years ago
What 3 mixtures can be separated by filteration
grandymaker [24]
.sand and water
.iron fillings in a liquid
.cereal in milk
7 0
3 years ago
What is the mass of 0.46 mol of MgCl2
Ronch [10]

Answer:

43.7

Explanation:

mole is equal mass concentration/ moler mass of MgCl²

8 0
3 years ago
Helppp plzzz will give brainlist
Maslowich
4. A
because PbCl2 is an ionic compound and it's solid, so it's a substance.
It cannot be mixture, because it's a pure molecule.
5. D
despite that both substances are gases, colorless they are different molecules, so they should have different either chemical and physical properties
6. C
this substance made from W atoms and others are made from molecules
5 0
2 years ago
Which compound contains both sigma and pi bonds
Misha Larkins [42]
Any compound with multiple covalent bonds
6 0
2 years ago
Read 2 more answers
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