chemistry Flashcards
(27 cards)
Covalent bonds are the form between non… sharing e… between a…
non metals, electrons, atoms.
Conservation of mass was discovered by… in…
Lavoislers in 1789
What is conservation of mass?
Mass is neither created or destroyed in chemical reactions.
Making salts from…
Acid involved a neutralization reaction, an acid and a base react to form salt and water.
what is the crystal experiment?
Mixing and heating solution and leaving it to cool down and form crystals, blue crystals.
Ionic bonding is the form between m… and non … transferring e… leading to charged i… that att… each other
metals, non metals, electrons, ions, attract
What is an alloy?
Mixture of two or more elements with at least one metal.
give 2 examples of alloys
brass (copper and zinc.) bronze (copper and tin.)
What is group reactivity?
elements within a group of the periodic table participate in chemical reaction.
Give an example of easily reacting groups
group 1 and 7 react easily.
as you go d… the atoms get l… and more r…
down, larger, reactive.
What are acids?
substances that produce hydrogen ions when dissolved in water.
What is litmus paper?
paper that is dipped in solution and changes colour to indicate concentration of alkalis and acids.
What is litmus paper and a ph meter called?
Universal indicators.
what colour does the litmus paper turn when an alkali is present?
purple-blue
What colour does litmus paper turn when the solution is neutral?
green
what does it indicate when litmus paper turns red- yellow
acid
Ionic compounds are made by e… attraction between p.. and n… charged i…
electrostatic, positive, negative, ions
Electrolysis is using e… to seperate elements in i… c…
electricity, ionic, compounds
Explain step 1 and 2 of the electrolysis practical
- fill beaker will boiling water or electrolyte. 2. place negative and positive electrode into beaker and clamp crocodile clips onto them.
Explain step 3 of electrolysis
Connect to a power supply and mix it and then leave it alone.
what does electrolosis create durring the practical?
copper can form on the negative electrode.
What is a benefit of using an electronic Ph meter?
It gives an exact reading
What number are acids between on electronic ph meters
0-6.5
