Calculate the ΔHrxn for the following
2NOCl(g)→N2(g)+O2(g)+Cl2(g)

Given:
12N2(g)+12O2(g)→NO(g)
ΔH = 89.32

NO(g)+12Cl2→NOCl(g)
ΔH = -30.39

Answer:

2 NO (g) → N2 (g) + O2 (g)

2 NOCl (g) → 2 NO (g) + Cl2 (g)

____________________________

2NOCl (g) ⟶ N2 (g) + O2 (g) + Cl2 (g)

ΔH = [90.3 kJ x 2 x -1] +  [-38.6 kJ x -1 x 2] = -103.4 kJ

The ΔH for the reaction is -103.4 kJ

How might a biologist use a distance-time graph or a speed-time time graph?

A boat with a jet engine demonstrates Newton's law of action-reaction. Why is this true?
A) As the boat expels exhaust forward, the boat moves forward.
B) As the boat expels exhaust backward and forward, the boat remains stationary.
C) As the boat expels exhaust forward, the boat remains stationary.
D) As the boat expels exhaust backward, the boat moves forward.

We can think of electromagnetic waves as a kind of ongoing message being sent out by the universe. Humans are able to naturally access only a portion of this message.

What information from the passage best supports this statement?

a
Mankind has invented tools to harness the information contained within electromagnetic radiation.
b
Without light, we wouldn't be able to process the visible world.
c
The waves emitted by our physical world make it possible for us to communicate over vast distances.
d
The human eye is only sensitive to a portion of the electromagnetic spectrum.

What is true about all forces?

A) They are unbalanced

B) They involve more than one object

C) They cause objects to move

D) They cancel each other out

(This is a question from BrainPop)

A storm is

a. “dome” of water that sweeps across the coast where a hurricane lands.

_ b. Huge body of air that has similar temperature, humidity, and air pressure at any given height.

c. Boundary where air masses meet and cold air rises above warm air.

d. Violent disturbance in the atmosphere
BRAINLIEST BRAINLIEST BRAINLIEST

Jorge is sitting on a couch. Gravity exerts a downward force on him. Based on Newton's law of action-reaction, the other force acting on Jorge is the – *
A) downward force of the floor.
B) downward force of air pressure.
C) upward force of momentum.
D) upward force of the couch.

What type of wave is represented in the diagram?

Answer all 5 questions, please

Which situation best explains the law of force and acceleration? *
A) Restraints keep passengers from falling out of a rollercoaster when it travels upside down.
B) A larger force will be required to accelerate a roller coaster with more people on it.
C) Riders must be a certain height so they can ride the rollercoaster.
D) A rollercoaster that goes up must also come down due to the force of gravity.

Calculate the ΔHrxn for the following


Fe2O3(s)+3CO→Fe(s)+3CO2(g)
Given:
4Fe(s)+3O2(g)→2Fe2O3(s)
ΔH = -1645.36

2CO2(g)→2CO(g)+O2(g)
ΔH = 567.66

Describe the direction in which each object will accelerate. If the object won’t accelerate, write “no acceleration.” Explain what might be happening to each object in terms of its overall motion.

Atomic symbols cannot be used to communicate...

A.the size of an atom.

B.the charge of an atom.

C.the number of neutrons.

D.the number of protons

A student lists three temperature measurements: 200°F, 200°C, and 200 K. Of the three measurements, 200 K is the highest temperature. true or false

PLEASE HELP
I will mark brainliest

Compare and contrast the applications and benefits of circle graphs and bar charts

can you answer all of the questions plz

Which example describes an inherited trait that cannot be determined by observing an individual?

What color element symbol designates elements that are a gas at a given temperature?

Coefficient -
Subscript for K-
3) 4K CO
Subscript for C
Subscript for 0 -

why does gold sink and wood float when they have similar volumes? Include what is happening with the mass size and arrangement of atoms
explain density in your own words
gold sinks and wood floats because____

how is the preodictable arranged by atomic mass, coloms , and rows

Which is produced in a synthesis reaction?

A. a single element
B. a single compound
C. a single ion
D. a single atom

When a pot of water is boiling on the stove it has increased....?

1) Potential Energy

2) Elastic Energy

3) Thermal Energy

4) Kinetic Energy

Describe the direction in which each object will accelerate. If the object won’t accelerate, write “no acceleration.” Explain what might be happening to each object in terms of its overall motion.

What is the length of a "Jupiter day" in terms of Earth hours or days?
around 15 Earth hours
around 10 Earth hours
around 10 Earth days
around 15 Earth days

Which of the following best explains the relationship between molecules and atoms?


A
Atoms are molecules that have a charge.


B
Atoms have smaller parts, called molecules.


C
Molecules are made up of two or more atoms.


D
Molecules are atoms that have no mass.

A ball is rolled in a straight line on a smooth frictionless surface. According to Newton's law of inertia, the ball will –
A) continue to roll in a straight line and eventually slow to a stop.
B) continue to roll in a straight line and increase, then decrease in speed.
C) continue to roll in a straight line and gradually increase in speed.
D) continue to roll in a straight line and remain at a constant speed.

A little boy is being pushed in a wagon by his mother. Suddenly, the little boy's mother stops to watch for cars before she crosses the street. The little boy's body continues to move forward in the stopped wagon until he tumbles out. The forward movement of the boy's body shows – *
A) Newton's law of gravity.
B) Newton's law of inertia.
C) Newton's law of force and acceleration.
D) Newton's law of action-reaction.

The risk of injury in a car accident is much greater if occupants do not wear a seat belt. Which of Newton's laws explains why this is true? *
A) Law of inertia
B) Law of force and acceleration
C) Law of action-reaction
D) Law of gravity

8) Which of the following is correct for 5mol/ dm3 of any substance?
a) 5 moles of substance dissolved in 5 cm3 of its solution.
b) 5 moles of substance dissolved in 1 dm3 of its solution.
c) 5 moles of substance dissolved in 100 cm3 of its solution.
d) 1 moles of substance dissolved in 1000 cm3 of its solution.
please answer asap