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WorksheetsC1 8.5A, B, D Atomic Structure & Chemical Formulas
Total questions: 15
Worksheet time: 22mins
Oxygen and oxygen-containing compounds are involved in many different reactions. Which balanced equation represents a reaction that involves 14 atoms of oxygen?
NH₄Cl + KOH → NH₃ + H₂O + KCl
2Na + 2H₂O → 2NaOH + H₂
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
4Fe + 3O₂ → 2Fe₂O₃
The names and chemical formulas for four substances are shown in the chart. Which substance listed in the chart is made up of the most atoms?
Carbonic acid
Nitric acid
Phosphoric acid
Sulfuric acid
How many atoms of oxygen are in a molecule of glucose (C₆H₁₂O₆)?
(a)
How many atoms in all are in a molecule of serotonin?
(a)
How many atoms of each element are in one molecule of 2-heptanone?
4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom
7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom
7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms
6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms
An atom would become a different element if which characteristic changed?
The number of protons
The number of neutrons
The number of energy levels
The number of valence electrons
A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?
Oxygen, O, and neon, Ne
Fluorine, F, and neon, Ne
Silicon, Si, and phosphorus, P
Beryllium, Be, and boron, B
The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?
The element is sodium, and it is highly reactive.
The element is fluorine, and it is not very reactive.
The element is sodium, and it is not very reactive.
The element is fluorine, and it is highly reactive.
Which table correctly identifies the charges of subatomic particles?
Table A
Table B
Table C
Table D
Which of these statements about the mass of subatomic particles is true?
The mass of a proton is the same as the mass of an electron.
The mass of a neutron is the same as the mass of an electron.
The mass of a neutron is much greater than the mass of a proton.
The mass of a proton is much greater than the mass of an electron.
A model of a beryllium atom is shown below. What types of particles are found in the cloud surrounding the atom’s nucleus?
Positively charged particles and negatively charged particles
Negatively charged particles only
Neutral particles and positively charged particles
Positively charged particles only
Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?
Boron is the most reactive because it has the most protons.
Fluorine is the most reactive because it has 7 electrons in the outer shell.
Silicon is the most reactive because it has an equal number of protons and neutrons.
Gallium is the most reactive because it has many more neutrons than protons.
What is the mass number of a potassium (K) atom that has 20 neutrons?
18
19
20
39
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
72 protons, 178 neutrons, 106 electrons
72 protons, 106 neutrons, 72 electrons
178 protons, 250 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.
