Unit 2 test flashcards
Exothermic or endothermic? Burning wood.
exothermic
Covalent bonds form between…
non-metals
What type of chemical reaction occurs when 1 substance breaks down into 2 or more substances?
decomposition
Requires energy, Endothermic, Delta H is positive
Requires energy, Endothermic, Delta H is positive
What type of chemical reaction occurs when two compounds swap partners?
Double Replacement
What type of chemical reaction occurs when 2 or more substances combine to form another?
synthesis
Exothermic or endothermic? Baking a cake.
endothermic
How can you tell if a reaction is endothermic?
the temperature decreases
What type of energy is released during the fusion or fission of atoms?
nuclear
Ionic bonds always form between metals and ___________.
non-metals
What is a half-life (in science)?
the amount of time for half a radioactive sample to decay
Covalent drawings use…
circles
When drawing an ionic compound draw the
lewis structures & transfer with arrow and add charges
What is nuclear fusion?
combining 2 small atoms into 1
What is a concern about nuclear energy?
nuclear radioactive waste exposure which can be fatal to living things
What type of chemical reaction occurs when 1 element replaces another?
Single Replacement
Covalent Bonds
share
Do endothermic reactions produce or absorb energy?
absorb
Is this equation balanced? Li + O2 → Li2O
no
Is this equation balanced? PbO2 → PbO + O2
no
What does a catalyst do?(Science question)
makes a chemical reaction faster
What is half life?
time for half the nuclei to decay
Is this equation balanced? LiCl + Na → Li + NaCl
yes
Is this equation balanced? 2NaCl + MgO → MgCl2 + Na2O
yes
