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Science test on chem Flashcards

1
Q

What is a chemical compound?

A

A chemical compound is a substance formed when two or more elements chemically bond together.

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2
Q

What are the two main types of chemical compounds?

A

Ionic compounds and covalent compounds.

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3
Q

What is an ionic compound?

A

An ionic compound is formed when atoms transfer electrons, resulting in oppositely charged ions that attract each other.

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4
Q

What is a covalent compound?

A

A covalent compound is formed when atoms share electrons.

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5
Q

What is the formula for sodium chloride?

A

NaCl

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6
Q

What kind of bond is present in water (H2O)?

A

Covalent bond.

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7
Q

What is the periodic table?

A

The periodic table is a tabular arrangement of chemical elements organized by their atomic number, electron configuration, and recurring chemical properties.

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8
Q

How many elements are in the periodic table as of 2023?

A

118 elements.

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9
Q

What is the atomic number of carbon?

A

6.

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10
Q

True or False: Noble gases are highly reactive.

A

False.

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11
Q

What is the common name for the group 1 elements in the periodic table?

A

Alkali metals.

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12
Q

What type of bond forms between two nonmetals?

A

Covalent bond.

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13
Q

What is the chemical formula for methane?

A

CH4.

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14
Q

What is the charge of an electron?

A

Negative.

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15
Q

Fill in the blank: The formula for magnesium oxide is _____.

A

MgO.

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16
Q

Which element has the chemical symbol ‘Fe’?

A

Iron.

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17
Q

What is the primary characteristic of metals on the periodic table?

A

They are good conductors of heat and electricity.

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18
Q

What is the formula for calcium carbonate?

A

CaCO3.

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19
Q

True or False: Ionic compounds typically have high melting and boiling points.

A

True.

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20
Q

What is a common property of covalent compounds?

A

They usually have lower melting and boiling points than ionic compounds.

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21
Q

What do you call a positively charged ion?

A

Cation.

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22
Q

What do you call a negatively charged ion?

23
Q

Fill in the blank: The chemical formula for sulfuric acid is _____.

24
Q

What is the main use of sodium bicarbonate (baking soda)?

A

It is used as a leavening agent in baking.

25
What is the chemical symbol for gold?
Au.
26
What are transition metals?
Elements found in groups 3-12 of the periodic table, characterized by their ability to form variable oxidation states.
27
What type of bonding occurs in diamond?
Covalent bonding.
28
What is the formula for potassium nitrate?
KNO3.
29
True or False: All ionic compounds are soluble in water.
False.
30
What is the primary component of table salt?
Sodium chloride (NaCl).
31
Which group in the periodic table contains the halogens?
Group 17.
32
What is the chemical formula for ammonia?
NH3.
33
What is the octet rule?
Atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.
34
What is the charge of a sulfate ion?
2-.
35
Which element is a liquid at room temperature?
Bromine (Br).
36
What is the chemical formula for acetic acid?
CH3COOH.
37
What is the most abundant gas in Earth's atmosphere?
Nitrogen (N2).
38
What does the term 'allotropes' refer to?
Different forms of the same element in the same physical state.
39
What is the chemical formula for hydrochloric acid?
HCl.
40
What is the common name for the group 2 elements in the periodic table?
Alkaline earth metals.
41
What is the chemical formula for iron(III) oxide?
Fe2O3.
42
True or False: Covalent compounds can conduct electricity in solution.
False.
43
What is the primary use of calcium hydroxide?
It is used in construction and as a pH regulator.
44
What is the chemical formula for glucose?
C6H12O6.
45
What do you call the vertical columns in the periodic table?
Groups or families.
46
What is the most reactive group of metals?
Alkali metals.
47
What is the chemical symbol for silver?
Ag.
48
What type of bond is formed between sodium and chlorine in sodium chloride?
Ionic bond.
49
What is the chemical formula for phosphoric acid?
H3PO4.
50
What does the term 'molecular compound' refer to?
A compound formed by covalent bonds between nonmetals.
51
What is the charge of a nitrate ion?
1-.
52
What is the chemical formula for lithium fluoride?
LiF.
53
True or False: The atomic mass of an element is the weighted average of all its isotopes.
True.

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