Question 1(multiple choice worth 4 points)
during a chemical reaction, what remains cons...
Physics, 21.11.2019 21:31 IDespretlyneedhelp
Question 1(multiple choice worth 4 points)
during a chemical reaction, what remains constant?
composition
temperature in beaker
amount of energy
the bonds
question 2(multiple choice worth 4 points)
(sc.912.p.8.2)
which of the following is not a physical change?
freezing ice
molding clay
filtering a mixture
cooking a steak
question 3(multiple choice worth 4 points)
the type of change where new compounds are formed is called a
chemical change
phase change
physical change
nuclear change
question 4(multiple choice worth 4 points)
(sc.8.p.9.1)
where does the energy given off by an exothermic reaction come from?
the chemicals make the energy during the reaction from atoms that are consumed.
the atoms in the air are converted to energy during the explosion.
the energy is converted from the heat taken in by the exothermic reaction.
more energy is given off by the new bonds formed than is needed to break the original bonds.
question 5(multiple choice worth 4 points)
when 10 grams of salt dissolve in 25 grams of water, what is the resulting mass of the mixture?
the resulting mass would be 15 grams.
the resulting mass would be 35 grams.
the resulting mass would be 40 grams.
the mixture would need to be measured to determine the mass.
Answers: 2
Physics, 21.06.2019 17:20, issaaamiaaa15
An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?
Answers: 1
Physics, 21.06.2019 19:30, Fangflora3
11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?
Answers: 1
Physics, 21.06.2019 22:30, dyamondgeorge1oy4nex
During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?
Answers: 2
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