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WorksheetsAtoms, Atomic Theory, Isotopes, and Chemical Reactions
Total questions: 20
Worksheet time: 5mins
Isotopes of an element have a different number of...
Mass Number
Protons
Neutrons
Electrons
Potassium-39 has how many neutrons?
(a)
Bromine-80 has how many protons?
(a)
Which of the following shows an element with 76 protons and 114 neutrons?
Arsenic - 190
Arsenic - 114
Osmium - 190
Osmium - 114
Which element has 12 protons and 13 neutrons?
Magnesium
Carbon
Aluminum
None of these answer choices.
Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what should the relative atomic mass (or average atomic mass) of Rubidium be? (HINT: Use your periodic table)
85.468 amu
37 amu
85.6 amu
86.4 amu
How do you calculate mass number?
Protons - Electrons
Protons + Neutrons
None of these answers.
Neutrons + Protons
The smallest unit of a pure substance that has the properties of that substance is widely known as a(n) (a) ?
Atoms are made up of three basic parts, which are -
(a)
What scientist is best known for his "Plum Pudding" model of the atom?
(a)
An atom's overall charge is ________.
Depends
Neutral
Positive
Negative
Rutherford's gold foil experiment provided evidence that...
negative and positive charges are spread evenly throughout the atom.
alpha particles have a positive charge.
gold is not a dense as previously thought.
there is a dense positively charged nucleus at the center of an atom.
If a chemical reaction is EXOTHERMIC, the temperature surrounding the chemical reaction would....
Increase
Decrease
Stay the same
If a chemical reaction is endothermic, the temperature surrounding the chemical reaction would...
Increase
Decrease
Stay the same
Select the answer which correctly names the reaction as well as correctly classifies the way energy is involved in this process.
photosynthesis ; exothermic
cellular respiration ; exothermic
cellular respiration ; endothermic
photosynthesis ; endothermic
What instrument would you use to detect an endothermic or exothermic reaction?
Thermometer
Ruler
Triple-Beam Balance
Which of the following is a sign that a chemical reaction has occurred?
Eruption or formation of bubbles
change in shape
expanding to occupy a larger, bigger volume
change in density
Which of the following is a sign that a physical reaction has occurred?
Eruption or formation of bubbles
change in temperature
expanding to occupy a larger, bigger volume
change in chemical formula
According to the following chemical reaction 2Mg + O2 ---> 2MgO, which are the reactants?
Mg and O2
MgO
Mg and MgO
O and MgO
According to the following chemical reaction, which is considered a product?
carbon dioxide - CO2
Glucose - C6H12O6
Oxygen - O2
None of these choices
