11th grade chemistry study guide need help

Chemistry

1 answer:

Nataly [62]2 years ago

7 0

Answer:

45) the answer is C.

46) The calculation of quantities in chemical reaction is called Stoichiometry .

47) The phase changed from solid to gas so I think the answer is A.

48) The phase changed from solid to gas as well so I think that the answer is A again.

49) Applying the formula n = m/M, we have n = 1.5 moles, therefore the answer is D.

50) C2H4 + 3O2 -> 2H2O + 2CO2

The answer is C.

51) The answer is C.

52) 2NaHCO3 + CaCl2 -> CaCO3 + H2O + 2NaCl + CO2

Hopefully I got all of them correct.

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Elements that have the following qualities: Lustrous, Solid at Room Temperatures, They react and form Basic Compounds, Great con

Tatiana [17]

Answer:

They are classified as METALS.

Explanation:

Elements are simple substances that cannot be chemically broken down into smaller substances. Based on different characteristics, they are classified into 3 namely:

- metals

- non metals and

- metalloid( mainly act as semi- conductor).

METALS are the type of elements that loses electrons to form positive ion, that is, they are electropositive elements. They are distinguished by the following characteristics:

- LUSTROUS: they have the ability to reflect light from its surface.

- At room temperature: Metals are solid are room temperature with the exception of Mercury which is liquid at room temperature.

- They react and form Basic Compounds

- Great conductor: most metals are great conductors of heat and electricity because they possess free electrons.

- Melting Point: they have high melting points.

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2 years ago

Which of the following is an example of oxidation? A. Charcoal is placed on a grill and lighting fluid poured over it. B. A car

Vikentia [17]

Answer:

The Answer is (B) A car get rusty over the course of few yearsExplanation:

Explanation:

Oxidation refers to the process of loss of electrons by a molecule,atom or ion during a chemical reaction.The process which is just the opposite of oxidation is reduction,it occurs when their is gain of electrons .
When iron reacts with the oxygen it forms a chemical know as Rust.In this case iron has lost some electrons and the oxygen has gained some electrons