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On this day in 1945, which city in Japan was hit by an atomic bomb?
What is the result of the following expression: 18 ÷ 3 x 2 + 4?
Which of the following is an example of an acidic substance commonly found in the home?
Which of the following is a common way to neutralize an acid spill in the home?
📌Arithmetic operations order
(BODMAS or PEMDAS)
1⃣ Brackets: Perform any calculations inside brackets first.
Example: Simplify the expression
(3 + 4) x 2.
Solution (3 + 4) x 2 = 7 x 2 = 14
2⃣ Orders: Evaluate any exponents or powers next.
Example: Simplify the expression 2^3 + 4.
Solution: 2^3 + 4 = 8 + 4 = 12
3⃣ Division and Multiplication: Perform any multiplication or division, working from left to right.
Example: Simplify the expression 12 ÷ 3 x 2.
Solution: 12 ÷ 3 x 2 = 4 x 2 = 8
4⃣ Addition and Subtraction: Perform any addition or subtraction, working from left to right.
Example: Simplify the expression 6 + 3 x 2 - 4.
Solution: 6 + 3 x 2 - 4 = 6 + 6 - 4 = 8
✅It's important to note that multiplication and division have the same priority, as do addition and subtraction.
📝When there are multiple operations of the same priority, you should perform them from left to right.
Here's another example to illustrate the order of operations:
📚Simplify the expression
👉 4 + 5 x 3^2 ÷ 6 - 2.
Step 1: Brackets
There are no brackets in this expression, so we move on to the next step.
Step 2: Orders
There is an exponent in this expression, so we evaluate it first:
4 + 5 x 3^2 ÷ 6 - 2 = 4 + 5 x 9 ÷ 6 - 2
Step 3: Division and Multiplication
Next, we perform any multiplication or division, working from left to right:
4 + 5 x 9 ÷ 6 - 2 = 4 + 45 ÷ 6 - 2
= 4 + 7.5 - 2
Step 4: Addition and Subtraction
Finally, we perform any addition or subtraction, working from left to right:
4 + 7.5 - 2 = 9.5
Therefore, the solution to the expression 4 + 5 x 3^2 ÷ 6 - 2 is 9.5.
Which of the following is NOT a type of symbiotic relationship?
Which of the following is NOT a function of the circulatory system?
The simplified form of the expression:
3(4x + 2) - 2(3x - 1) is:
The simplified form of the expression:
3(4x + 2) - 2(3x - 1) is
a) 6x + 4 b) 6x + 8 c) 10x + 4
On this day in 1969, the Apollo 11 mission successfully landed on the moon. Who was the first person to step on the moon?
14. Which of the following is not a type of chemical equilibrium?
a) Acid-base equilibrium
b) Redox equilibrium
c) Solubility equilibrium
d) Electrochemical equilibrium
Answer: d) Electrochemical equilibrium
Explanation: Electrochemical equilibrium is a type of dynamic equilibrium, not a separate type of chemical equilibrium.
15. Which of the following is not a type of reaction mechanism?
a) Homogeneous mechanism
b) Heterogeneous mechanism
c) Radical mechanism
d) Stoichiometric mechanism
Answer: d) Stoichiometric mechanism
Explanation: Stoichiometric mechanism is not a type of reaction mechanism, but rather a term used to describe a reaction that occurs in a single step without intermediates.
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