chemistry physics

which one of the following is not a laboratory safety rule?

• wear safety clothing

• do not eat in the lab

• do not inform your teacher of an accident

• do not run in the lab

what should one do when in contact of sodium hydroxide in the lab?

• add an acid

• add more sodium hydroxide

• run out of the lab

• wash with running water

what should be done when suffocated by fumes in the lab?

• drink a lot of water

• close your mouth

• move out of the lab to a better ventilated area

• close all the windows

which one of the following is not a state of matter?

• solid

• oxygen

• liquid

• gas

the picture shows arrangement of particles in what state of matter?

• gas

• liquid

• solid

• plasma

the figure shows arrangement of particles in what state of matter?

• solid

• gas

• liquid

• plasma

the figure shows arrangement of particles in what state of matter?

• plasma

• solid

• liquid

• gas

exothermic reactions results in?

• heat absorption

• heat release

• formation of products

• breakdown of reactants

endothermic reaction results in ?

• heat release

• heat absorption

• breakdown of reactants

• formation of products

the figure shows different changes of state of matter. which change of state is exothermic?

• melting

• boing

• sublimation

• freezing