Question | Answer |
How do you find the atomic number of an element? | Its the top number on the little element square |
How do you find the atomic mass? | Its the number on the bottom underneath the word for the element |
How do you find the protons and the electrons of the element? | Its the same as the atomic number (top number) |
How do you find the neutrons of the element? | Atomic mass - Atomic number |
Is breaking a chrome book a physical or a chemical change? | Physical change |
Is burning a hamburger a physical or chemical change? | Chemical change |
What are the reactants in this chemical equation?
CH4 + 2 O2 → CO2 + 2 H2O | CH4 + 2 O2 |
What are the products in this chemical equation?
CH4 + 2 O2 → CO2 + 2 H2O | CO2 + 2 H2O |
How can you tell if this is a chemical reaction? | You can tell a chemical reaction occurred because the reactants and products are different. |
What happens to the mass of a substance when it changes phases. | Nothing it stays the same because of law of conservation of mass. |
If you combine two chemicals and they start to make your hand feel warm, what kind of chemical reaction is taking place? | exothermic reaction because it is releasing heat |
If you combine two chemicals and they suddenly turn dark, what kind of chemical reaction is taking place? | endothermic because the reaction is absorbing energy |
Why do endothermic reactions absorb energy? | When the bonds in an endothermic reaction are being created between molecules, the energy is absorbed to create the bonds |
Why do exothermic reactions release energy? | When the bonds are being broken between molecules during an exothermic reaction, the energy that was holding them together is released. |