chemical change

what is an exothermic reaction?

• An exothermic reaction does not involve any energy change.
• An exothermic reaction is always endothermic.
• An exothermic reaction absorbs energy from the surroundings.
• An exothermic reaction releases energy in the form of heat or light.

what is an endothermic reaction?

• An endothermic reaction releases heat to its surroundings.
• An endothermic reaction absorbs heat from its surroundings.
• An endothermic reaction does not involve any heat exchange.
• An endothermic reaction only occurs in living organisms.

what is a thermite reaction?

• A thermite reaction is a type of nuclear reaction involving fusion of atoms.
• A thermite reaction is a slow and controlled chemical reaction used in cooking.
• A thermite reaction is a reaction that produces cold instead of heat.
• A thermite reaction is a highly exothermic reaction between a metal oxide and a reducing agent, typically aluminum powder, resulting in the production of molten metal and a significant amount of heat.

what is the reaction for calcium oxide and water?

• Calcium hydroxide

• Calcium bicarbonate

• calcium oxygen

• hydrocium

is calcium oxide and water an exothermic reaction?

• Maybe
• Yes
• Sometimes
• No

what is the color for the flame tests?

• All flames are blue
• Flame tests always show red color
• Various colors depending on the element present
• Flame tests have no color

what is the color for the flame test for sodium?

• Yellow
• Red
• Green
• Blue

what is the color for the flame test for copper?

• Blue-green
• Purple
• Yellow
• Red

what is the colour for the flame test for barium?

• Red
• Blue
• Yellow
• Green

what is the colour for the flame test for potassium?

• Lilac
• Red
• Blue
• Yellow