Solutions
When a mixture is mixed __________, we call it solution.
evenly
How to get paper clips out of the water?
Use a magnet.
In chemical reactions, one substance is transformed into ____________.
another new substance
Acids react with bases to form __________ & _____________.
salt and water
What has hands but can't clap?
a clock
A solution is made up of ____________& ____________.
a solute and a solvent
How to separate salt from salty water?
Evaportaition
Chemical reactions happen through _______________________.
rearranging of atoms
Acids react with metals to produce _______ and _________.
salt and hydrogen gas
What goes up but never comes down?
Your age
Give examples of a solute & a solvent.
salt & water
Give three examples of lab instruments.
funnel, beaker, bunsen burner, stirring rod, filter, strainer
Chemical reactions is represented using chemical ____________________ and _______________________.
formulas and equations
How to measure acidity and alkalinity?
Ph indicators change colors to distinguish between acids and bases.
What can you catch but not throw?
a cold
What is solubility? Explain in your own language. Give examples of high solubility and low solubility.
substance's ability to dissolve
sugar vs. aspirin
Why is observation important when conducting experiments?
We need to note down the details and record precise data and it is the foundation for experimentation and data analysis.
What is the difference between subscripts and coefficients?
What is the difference between chemical formulas and equations?
2H2 +O2=2H20
chemical formulas: the types and numbers of atoms
chemical equations: the types and numbers of reactants and products
Compare and contrast acids and bases.
Similarities: 1. compounds 2. neutralization 3. corrosive
Differences: 1. Acids taste sour but bases taste bitter. 2. Ph values below 7 are acidic but values above 7 are alkaline (or basic).
What kind of room has no doors or windows?
A mushroom
soluble insoluble solubility residue solution solvent solute
What is the difference between a mixture and a solution?
A solution is a mixture that is mixed evenly.
化学反应, 物质, 原子重新排列, 化合物, 反应物, 生成物, 公式, 等式, 角标, 系数, 能量守恒定律
chemical reaction, substance, rearrangement of atoms, reactant, product, formula, equation, subscript, coefficient, law of conservation of mass
酸，碱，化合物，中和反应，溶解，腐蚀的，PH值，酸的，碱的
acid, base, compound, dissolve, corrosive, PH value, acidic, alkaline
What has many teeth but cannot bite?
a comb