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Science > Chemical Changes > Flashcards

Chemical Changes Flashcards

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1
Q

Key characteristic of a physical change?

A

Chemical properties of substances remains the same.

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2
Q

Key characteristic of a chemical change?

A

New chemical substance is formed.

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3
Q

Acid + Metal = ?
Observation = ?
Test + Observation = ?

A

Salt + Hydrogen Gas
Effervescence observed
Use a LIGHTED SPLINT + EXTINGUISH A LIGHTED SPLINT WITH A ‘POP’ SOUND

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4
Q

Acid + Metal Carbonate = ?
Observation = ?
Test + Observation = ?

A

Salt + Carbon Dioxide Gas + Water
Effervescence observed
Bubble the gas into LIMEWATER + WHITE PRECIPITATE FORMED in limewater

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5
Q

Acid + Alkali = ?
Observations = ?
Test + Observation = ?

A

Salt + Water
No visible change + Test tube feels hot
NIL

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6
Q

3 types of chemical reactions of acids and alkalis

A
  1. Acid + Metal
  2. Acid + Metal Carbonate
  3. Acid + Alkali
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7
Q

3 types of acids

A
  1. Hydrochloric acid
  2. Nitric acid
  3. Sulfuric acid
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8
Q

Suffix & Prefix of naming salts ?

A 
Prefix = metal (1st) 
Suffix = acid (2nd)
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9
Q

Acid suffix names ?

A
  • chloride
  • nitrate
  • sulfate
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10
Q

Define pH

A

A measure of HOW ACIDIC OR ALKALINE a substance is.

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11
Q

Define what an indicator is

A

It is a substance which CHANGES COLOUR depending on whether the solution being tested is acidic or alkaline.

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12
Q

3 types of indicators?

A
  1. Natural Indicator
  2. Litmus Paper
  3. Universal Indicator
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13
Q

Example of an alkaline reacting with an acid in daily-life?

A

Toothpaste

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14
Q

Example of an acid reacting with an alkali in daily-life?

A

Antacid

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15
Q

pH value :

  1. Acid
  2. Alkali
  3. Neutral
A
  1. < 7
  2. > 7
  3. 7 / = 7
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16
Q

Metals that cannot react

A

Gold, Silver, Platinum = Jewelry = skin has acid

Copper = Wire

17
Q

In a chemical reaction, ____?

A
  1. The mass of the product (s) is the SAME as the mass of the reactants [conservation of mass]
  2. The atoms of reactants REARRANGE to form new products

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