Conservation of Mass & Balanced Chemical Equations (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards
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Law of conservation of mass
Law of conservation of mass
Total mass of reactants = total mass of products
Why is mass conserved in reactions?
Why is mass conserved in reactions?
No atoms are created or destroyed, only rearranged
What makes a chemical equation balanced?
What makes a chemical equation balanced?
Same number of each element's atoms on both sides
Coefficients in chemical equations
Coefficients in chemical equations
Numbers in front of formulas to balance equations
First step to balance an equation
First step to balance an equation
Write the unbalanced equation with all chemical formulas
Second step to balance an equation
Second step to balance an equation
Count the atoms of each element on both sides
Third step to balance an equation
Third step to balance an equation
Adjust coefficients to equal atoms on both sides
Final step to balance an equation
Final step to balance an equation
Double-check by counting atoms again
Mr relationship in balanced equations
Mr relationship in balanced equations
Sum of Mr of reactants = sum of Mr of products
What is relative formula mass (Mr)?
What is relative formula mass (Mr)?
Total mass of all atoms in a compound
How to calculate Mr
How to calculate Mr
Add up relative atomic masses (Ar) of all elements