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7th Grade Science 1st Exam Review
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On a universal indicator, what color represents a strong acid?
Red
What do we call a substance with a pH of 7?
Neutral
What color does red cabbage indicator turn in an alkali?
Yellow
At what pH does litmus paper turn red?
Below 7
What is the symbol for?
Flammable
What is the symbol for?
Hazardous to Environment
What is the symbol for?
Health Hazard
What is the symbol for?
Serious Health Hazard
What is the symbol for?
Oxidizing
What is the symbol for?
Toxic
What is the symbol for?
Explosive
What is the symbol for?
Corrosive
What pH level is a neutral substance?
7
What color will a strong acid turn on a universal indicator?
Red
What is the pH range of the pH scale?
0 to 14
What does the oxidizing hazard label indicate?
The substance can give off heat when in contact with another substance
What does "corrosive" mean?
It can dissolve other materials
What two elements make up brass?
Copper and Zinc
What is a characteristic of strong alkalis?
They are corrosive
What color does red cabbage juice turn in an alkali?
Green
What does litmus paper indicate?
pH level
What safety equipment should you wear when working with acids?
Eye protection
Which process can separate copper sulfate from water?
Evaporation
What is sulfur primarily used for?
Rubber production
What does 24-carat gold mean?
It is pure gold
Why are alloys stronger than pure metals?
Their structure prevents sliding
What alloy is commonly used for cutlery?
Stainless Steel
Bronze and brass are examples of what?
Alloys
Which property do non-metals usually have?
Brittleness
What type of metal is typically used for making jewelry?
Silver
Which metal is liquid at room temperature?
Mercury
What property allows metals to be shaped without breaking?
Malleability
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