Questions and Answers
Who was the first person to classify elements?
Dmitri Mendeleev
How are elements organized in the periodic table?
By atomic number and chemical properties
What are the vertical columns in the periodic table called?
Groups
Which type of elements are good conductors of heat and electricity?
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What physical property do nonmetals typically exhibit?
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How many periods are there in the periodic table?
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What is the basis for organizing elements in the periodic table?
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Which physical property is NOT typically associated with metals?
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What is the main difference between groups and periods in the periodic table?
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Which scientist is credited with the first classification of elements in the periodic table?
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What type of elements are located in the vertical columns of the periodic table?
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Which group of elements is known for being poor conductors and brittle?
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What do we need to do before adding or subtracting numbers?
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Which of the following correctly shows the addition of 21 and 12?
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What is the result of subtracting 8 from 10?
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In the subtraction problem 56 - 31, what is the difference?
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If JC had 48 match sticks and used 25 to make a fence, how many match sticks were not used?
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What is the result of 28 + 5?
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If you need to regroup in the subtraction problem 65 - 27, what would be the difference?
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What is the sum of 25 + 45?
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What is the result of 21 - 13?
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If JC had 48 match sticks and used 25 to make a fence, how many match sticks were not used?
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Study Notes
Math 2 - 2nd Term Mid Term Reviewer SY 2023-2024
- In rewriting addition and subtraction, we need to stack and line numbers up first before we add or subtract.
- 5 + 2 = 7, and the model shows 21 + 12 = 33.
- 10 – 8 = 2, and the model shows 11 - 4 = 7.
Rewrite 2-Digit Addition and Subtraction
- Rewrite the addition problem, then add.
- Examples include 28 + 5, 30 + 17, 25 + 45, 29 + 40, and 16 + 35.
- Rewrite the subtraction problem, then subtract.
- Examples include 18 - 9, 21 - 13, 45 - 18, 65 - 27, and 56 - 31.
Word Problem
- JC had a match box of 48 matchsticks and used 25 matchsticks to make a fence.
- The solution is to find the number of matchsticks not used.
Science and Health 7 Work Plan
Classification of Elements
- The Periodic Table of Elements is a list of all known elements.
- Dmitri Mendeleev was the first to classify elements.
- Elements are organized by atomic number and chemical properties.
Periodic Table of Elements
- The periodic table is arranged by atomic number.
- It consists of groups (vertical columns) and periods (horizontal rows).
- Groups have 18 columns, and there are 7 periods.
Properties of Elements
- Metals have good conductors of heat and electricity, are malleable, ductile, and lustrous.
- Nonmetals are poor conductors and brittle.
- Metalloids have properties between metals and nonmetals.
