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chemistry
year 8 chemistry
Question | Answer |
---|---|
What is an Element | A substance which cannot be split up in chemical reactions. |
What is an atom | The smallest particles of an element that can exist. |
What is a group of the same atoms joined together called | A molecule |
What is a group af different atoms joined together called | A compound |
What is a chemical formula | Tells you the number of atoms of each elemnt in a compound |
What is the atomic number | The number of protons in an atom of an element |
Are elemens neutral, positive or negative | Neutral |
What is Mass number of an atom | The sum of the protons and neutrons in an atom |
What are isotopes | Atoms of the same element with different numbers of neutrons |
Where do you find the mass number on the periodic table | Below the element symbol |
Where do you find the atomic number on the periodic table | Above the element symbol |
When an atom loses electrons it becomes | Positively charged |
When an atom gains electrons it becomes | Negatively charged |
What is a saturated solution | A solution that cannot dissolve any more solute without adding more solvent or increasing the temperature |
What ph is an acid | 1-6 |
What ph is neutral | 7 |
What ph is an alkali | 8-14 |
Sulphuric acid makes | sulphates |
Nitric acid makes | nitrates |
Hydrochloric acid makes | chlorides |
Bases which disolve in water are called | alkalis |