Say which of these words are countable which are uncountable? ( chalk, water, backpack, ruler, rubber, dress, brush, cheese, glue, dictionary, paper, pensil sharpener, felt-tip.)

uncountable: chalk, water, сheese, glue, paper 
countable: backpack, ruler, rubber, dress, brush, dictionary, pensil sharpener, felt-tip

Uncountable : chalk,water,cheese, glue,paper)
countable : backpack, ruler, rubber,dress,brush, dictionary, pencil sharpener,felt tip.