Elscores: Tuesday, 20 August 2024
Chemistry- (Unit 1)
Cumulative Review
Questions and Correct Answer
Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.
It can be physically broken down into different types of molecules.
✓ :-- It cannot be physically broken down into different types of atoms.
Which word equation shows lithium oxide being formed from the reaction between oxygen
and lithium?
oxygen + lithium oxide > lithium
lithium + oxygen > lithium oxide
oxygen + lithium > lithium + oxide
lithium oxide > lithium + oxygen
✓ :-- lithium + oxygen lithium oxide
What was Johann Dobereiner's contribution to the development of the periodic table?
He arranged the elements according to increasing atomic mass.
He arranged the elements according to increasing atomic number.
DO NOT COPY AND PASTE!!
, Elscores: Tuesday, 20 August 2024
He identified triads of elements that had similar properties.
He organized elements into four groups based on their properties.
✓ :-- He identified triads of elements that had similar properties.
The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How
many moles of water are contained in this sample?
1.00
18.0
36.0
324
✓ :-- 1.00
Which statement about hydrogen bonds is true?
They are the only force that allows a gecko to climb up glass.
They are the weakest of the intermolecular forces.
They are much stronger than intramolecular forces.
They help water striders walk on water by creating surface tension.
✓ :-- They help water striders walk on water by creating surface tension.
The chemical equation below shows the decomposition of ammonium nitrate
(NH4NO3).NH4NO3 N2O + 2H2OA chemist who is performing this reaction starts with
DO NOT COPY AND PASTE!!
Chemistry- (Unit 1)
Cumulative Review
Questions and Correct Answer
Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.
It can be physically broken down into different types of molecules.
✓ :-- It cannot be physically broken down into different types of atoms.
Which word equation shows lithium oxide being formed from the reaction between oxygen
and lithium?
oxygen + lithium oxide > lithium
lithium + oxygen > lithium oxide
oxygen + lithium > lithium + oxide
lithium oxide > lithium + oxygen
✓ :-- lithium + oxygen lithium oxide
What was Johann Dobereiner's contribution to the development of the periodic table?
He arranged the elements according to increasing atomic mass.
He arranged the elements according to increasing atomic number.
DO NOT COPY AND PASTE!!
, Elscores: Tuesday, 20 August 2024
He identified triads of elements that had similar properties.
He organized elements into four groups based on their properties.
✓ :-- He identified triads of elements that had similar properties.
The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How
many moles of water are contained in this sample?
1.00
18.0
36.0
324
✓ :-- 1.00
Which statement about hydrogen bonds is true?
They are the only force that allows a gecko to climb up glass.
They are the weakest of the intermolecular forces.
They are much stronger than intramolecular forces.
They help water striders walk on water by creating surface tension.
✓ :-- They help water striders walk on water by creating surface tension.
The chemical equation below shows the decomposition of ammonium nitrate
(NH4NO3).NH4NO3 N2O + 2H2OA chemist who is performing this reaction starts with
DO NOT COPY AND PASTE!!
