Y skill plans 7 science
i Standards
Fourth grade 0.2 Predict temperature changes
Question
Two identical blocks are heated to different temperatures. The blocks are placed so that they
touch each other. Heat can flow from one block to another but cannot escape from the blocks.
438'F
350°F
Block 1
Block 2
Challen
Later, the temperature of each block is measured again. Which pair of temperatures is
possible?
407'F
381'F
438'F
413-F
Block 1
Block 2
Block 1
Block 2
450'F
338'F
Block 1
Block 2

How many ions that have a +1 charge will bond with an ion that has a -2 charge

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 dna typing techniques do you think you would choose if you had to analyze a dna sample? why?