WorksheetsScience! Cool! Fun! Study! Yay!
Total questions: 10
Worksheet time: 3mins
What are some signs of a chemical change?
blood
bubbles
easy to reverse
No new substance created
What are some signs of a physical change?
heat
bubbles
Easy to reverse
new substance created
What is an exothermic reaction
more heat comes out than was put in
less heat comes out than was put in
What is one way to speed up reactions
decrease concentration
add water
remove heat
add a catalyst
What is one way to get salt out of salt water
magnets
evaporation
filter it
Which of these is a combustion reaction
2Mg + O2 → 2MgO
(NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O
CH4 + 2O2 → CO2 + 2H2O
Zn + 2HCl → ZnCl2 + H2
Which of these is a synthesis reaction
CH4 + 2O2 → CO2 + 2H2O
Zn + 2HCl → ZnCl2 + H2
(NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O
2Mg + O2 → 2MgO
What is a heterogeneous mixture
A mixture in which one substance dissolves
A mixture in which one substance does not dissolve
What does "cr" stand for in chemical equations
crystal
chromium
crystalline
cream
which of the following is a colloid
salt
water
shaving cream
soda
