Astudent poured 50.0 ml of 1.25 mol/l nitric acid - hno3- into a polystyrene cup and recorded that the temperature was 23.5°c. she then added 50.0 ml of 1.25 mol/l potassium hydroxide-koh- and found the temperature rose to 32.4°c. i. write a chemical equation representing the neutralisation reaction of the two chemicals. 2 marks) ii. calculate the enthalpy of neutralisation, given that the specific heat of water is 4.18 j/goc and the density of the solutions was 1.00 g/ml. 4 marks] b) in a laboratory experiment, 2.20 g of propanone - c3hso- was burned completely in oxygen. the heat from this combustion was used to raise the temperature of 100g of water from 18.9°c to 96.3°c calculate the enthalpy of combustion of propanone in kj/mol.

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Which of the following two events occur to create a sea breeze? select all that apply. warm air rises on the ocean and moves toward the land to cool warm air rises on land and moves toward the ocean to cool cool air moves from the ocean to be warmed by the land cool air moves from the land to be warmed by the ocean