Laws of chemical combination

Assessment

Laws of chemical combination

ninja coder

Chemistry

Grade9

10 Plays

100 Participants

Worksheet

10 Qs

1.
Multiple Choice
1 pts•30 s
Identify the law which states that matter cannot be created or destroyed in a chemical reaction.
Answer choices
Law of Definite Proportions
Law of Conservation of Mass
Law of Multiple Proportions
Avogadro’s Law
2.
Multiple Choice
1 pts•30 s
Explain the Law of Definite Proportions with respect to a compound.
Answer choices
Elements combine in any ratio by mass
Elements combine in a fixed ratio by mass
Mass of reactants equals mass of products
Elements form multiple compounds
3.
Multiple Choice
1 pts•30 s
Describe what the Law of Multiple Proportions states about two elements forming multiple compounds.
Answer choices
Mass of one element is constant
Masses of one element combine in simple whole-number ratios
Compounds have identical compositions
Mass is conserved in reactions
4.
Multiple Choice
1 pts•30 s
Name the scientist who proposed the Law of Conservation of Mass.
Answer choices
John Dalton
Antoine Lavoisier
Joseph Proust
Robert Boyle
5.
Multiple Choice
1 pts•30 s
Clarify why water always has hydrogen and oxygen in a 1:8 mass ratio.
Answer choices
Due to Law of Conservation of Mass
Due to Law of Definite Proportions
Due to Law of Multiple Proportions
Due to random combination
6.
Multiple Choice
1 pts•30 s
Point out an example that illustrates the Law of Conservation of Mass.
Answer choices
Water evaporating from a glass
Burning of wood producing ash and gases
Melting of ice
Dissolving sugar in water
7.
Multiple Choice
1 pts•30 s
Indicate the law that applies when carbon forms CO and CO2 with oxygen in a 1:2 mass ratio for CO2 compared to CO.
Answer choices
Law of Conservation of Mass
Law of Definite Proportions
Law of Multiple Proportions
Avogadro’s Law
8.
Multiple Choice
1 pts•30 s
State the significance of the Law of Conservation of Mass in chemical reactions.
Answer choices
It ensures compounds have variable composition
It ensures mass of reactants equals mass of products
It allows elements to combine in any ratio
It prevents chemical reactions
9.
Multiple Choice
1 pts•30 s
Describe why the Law of Definite Proportions does not apply to mixtures.
Answer choices
Mixtures have fixed compositions
Mixtures have variable compositions
Mixtures are chemically bonded
Mixtures form new substances
10.
Multiple Choice
1 pts•30 s
Explain the role of atoms in the laws of chemical combination.
Answer choices
Atoms are destroyed in reactions
Atoms combine in fixed or simple ratios
Atoms change their mass
Atoms do not participate in reactions