Answer:
b
Explanation:
slightly negative
slightly positive
Answer:
The correct answer is: B
Explanation:
slightly negative
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Answer:
Example: Burning wood
Souring milk
Mixing acid and base
Baking a cake
Explanation:
Chemical changes occur when a substance combines with another to form a new substance.
Example: Burning wood
Souring milk
Mixing acid and base
Baking a cake
the theoretical yield of hydrogen gas is 10 g
calculation
Step 1: write the equation for reaction
Zn + 2 HCl → zncl₂ + H₂
Step 2: use the mole ratio to find the moles of H₂
from equation above Zn : H₂ is 1: 1 therefore the moles of H₂ = 5.00 moles
Step 3: find the theoretical yield(mass) for H₂
mass = moles × molar mass
from periodic table the molar mass of H₂= 1×2 = 2 g/mol
mass = 5 moles × 2 g/mol = 10 grams
Answer:
Explanation:
B. magnesium and oxygen
C. magnesium and magnesium