PAX Chemistry and Physical Science Flashcards
6 cards from real PAX practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 PAX Chemistry and Physical Science flashcards as text
What happens during an exothermic reaction?
Answer: Energy is released to the surroundings
Exothermic reactions release energy (usually heat) to the surroundings, causing the temperature to rise.
What is the formula for calculating density?
Answer: Density = Mass / Volume
Density is defined as mass divided by volume (D = m/V) and is typically expressed in g/cm³ or g/mL.
An acid and a base react to form water and a salt. This type of reaction is called:
Answer: Neutralization
A neutralization reaction occurs when an acid and a base react to produce water and a salt.
What is Newton's First Law of Motion?
Answer: An object at rest stays at rest unless acted on by an external force
Newton's First Law states that an object remains at rest or in uniform motion unless acted upon by a net external force (law of inertia).
Which of the following is a chemical change?
Answer: Wood burning
Burning wood is a chemical change because it produces new substances (ash, CO₂, water vapor) that cannot be reversed.
What does the symbol 'Na' represent on the periodic table?
Answer: Sodium
Na is the chemical symbol for sodium, derived from the Latin word 'natrium.'
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