accident

acid

bare

broken

care

chemical

chemicals

chemistry

clean

compress

corrosive

danger

dangerous

destroy

dirty

disease

domestic

education

environment

factory

fingernails

glass

hand

hands

harmful

health

healthy

hold

hydroxide

industry

infected

infection

information

ingredient

laboratory

long

medicine

nitric

positive

product

reaction

research

risk

safety

scar

science

skin

sodium

symbol

test

treatment