If a 250 mL bag at 19°C, is
heated to 60°C, what will the
new volume of the bag be?

285.10mL

Explanation:

Using Charle's law

V1/T1 = V2/T2

T1=273+19=292K

T2=273+60=333

250/292=V2/333

V2=250×333/292

V2=285.10mL

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary