Over a million students use our free study notes to help them with their homework
A mole is a unit of 'amount of stuff' and is equal to 6.022x1023. It is such a big number because we use the mole to describe how many atoms we have of something, so instead of saying "I h...
Fluorine has 1 more proton than oxygen and one more electron but the same number of shells so no increased shielding. This means there is more electostatic attraction from the nucleus so increased pull fr...
Potassium has 1 electron in its outer shell whilst Sulphur has 6 electrons in its outer shell, this can be deduced from the periodic table as Potassium is in group 1 and Sulphur group 6. When the two reac...
Titrations are used to make soluble salts (remember solubility rules) from an acid and an alkali. There are no solids involved in this reaction and the solutions made are colourless so there is no way of ...
Bioethanol is a renewable fuel produced from plants, which photosynthesise to grow, taking in carbon dioxide and producing oxygen. This means there is no net increase in carbon dioxide, which is a greenho...
←
89
90
91
92
93
→
Internet Safety
Payment Security
Cyber
Essentials
Comprehensive K-12 personalized learning
Immersive learning for 25 languages
Trusted tutors for 300 subjects
35,000 worksheets, games, and lesson plans
Adaptive learning for English vocabulary
Fast and accurate language certification
Essential reference for synonyms and antonyms
Comprehensive resource for word definitions and usage
Spanish-English dictionary, translator, and learning resources
French-English dictionary, translator, and learning
Diccionario ingles-espanol, traductor y sitio de apremdizaje
Fun educational games for kids
