A
What is the first element on the periodic table?
Hydrogen
Acids usually taste like this.
Sour
Which element is found in both diamonds and pencil leads?
Carbon
Most metals are this, meaning they can be drawn into wires.
Ductile
What is the name of the compound made from hydrogen and oxygen that is essential for life?
Water H2O
This method can separate a mixture of sand and water.
Filtration
This element is the lightest element and the most abundant in the universe.
Hydrogen
This alloy, made of iron and carbon, is used to build bridges and buildings.
Steel
What is the name of the compound made of sodium and chlorine?
sodium chloride or salt
This common kitchen acid is found in all citrus fruits.
Citric acid
This element is essential for breathing and is found in the air.
Oxygen
This alloy is made by mixing copper with tin and was used in medals.
Bronze
Write the composition of air (percentage%)
78%nitrogen
21% oxygen
1% carbon dioxide, water vapour, argon
This method can separate a mixture of iron and sulphur.
Magnetism
How many total atoms are in 2 molecules of carbon monoxide?
4
This gold-colored alloy made of copper and zinc is used in musical instruments.
Brass
Suggest the names of the compounds with these formulae: MgO, NaCl, CaS
magnesium oxide, sodium chloride, calcium sulfide
Why is most gold jewelry made from an alloy instead of pure gold?
Because pure gold is too soft and would wear away easily.
What is the difference between a compound and a mixture?
A compound is chemically combined, while a mixture is physically combined and can be separated easily.
This strong alloy is commonly used in airplanes.
Duralumin