As the earth revolves around the sun, distant objects can be seen from different locations. This idea can be used to measure the distance between earth and nearby stars and is called stellar parallax. To see how this process works, consider the simplified scenario below. A distant object is observed on earth from location 1 and again six months later at location 2. The angle at both location 1 and 2 is 89.9°. How many astronomical units is the distant object from location 1?

The side length of the gazebo's base is the same as a side length of the outer surface of the gazebo's roof. If the roof is 1.5 m tall, what angle is formed at the top of each triangular section of the roof?

daphne is designing a poster for her band the sweet monsters she wants the letters to be slanted and wants the two words on separate lines she plans to draw a grid of parallel lines to use as a guide to do this A)using a straightedge and compass or a straightedge and protractor draw a parallel lines that daphne could use to guide each letter in her poster draw your guide so there are no right angles B)Explain how you know your parallel lines are parallel C) create the text for the poster

determine whether each of the following equations is a redox reaction or not

C6H12O6(s)→CO2(g)+C2H5OH(l)

NaOH(aq)+Al(s)+H2O(l)→H2(g)+NaAlO2(s)

SO2(g)+H2O(l)→H2SO3(aq)

2NaOH(aq)+Cl2(g)→NaCl(aq)+H2O(l)+NaClO(aq)

Na2CO3(aq)+2HCl(aq)→2NaCl(aq)+H2O(l)+CO2(g)

C6H12O6(s)+6O2(g)→6CO2(g)+6H2O(l)

Fe3O4(s)+CO(g)→3FeO(s)+CO2(g)

2Fe(OH)3(s)→Fe2O3(s)+3H2O(l)

  C 

assgin the oxidation numbers for each 

make sure to put the -/+ 

oxidation number       entity 

                                 I in I₂(s)

                                 S in HS^-(aq)

                                  Xe in XeF6(s)

Is there enough information to determine whether or not ABCD is a parallelogram? If so, explain whether or not it is a parallelogram

a technicion placed 2.5mol of NO(g) in an  empty 2.0L flask and allowed the contents to establish the following equilibrium. 

4NO(g)<---> 2N₂O(g) + O₂(g) + 197KJ

AT EQUILIBIRUM IT WAS DETERMINED THAT THERE WAS 0.58 MOL OF N₂O(g) present. 

what is the percent yield? 

part b. 

what is the equilibrium concentration of NO(g)?

part c. 

the equilibrium constant for this equilibrium is? 

the constant should be expressed in scientific notation is a.b $\times$× 10^-c

question 2. 

solid copper(II) sulfate is added to a flask containing water and then stoppered. the following equilibrium was established. 

CuSO4(s)<---> Cu²⁺(aq) + SO4^2-(aq)

when a small amount of a saturated solution of barium nitrate is added to the equilibrium system, the amount of solid copper(II) sulfate would ________(increase or decrease) as the system shifts to the _________ (left or right)

only choose one of the opitions to fill the blanks!

CO_(g) + H₂O_(g) <--->CO_2((g) + H_2(g) 

kc= 7.3

delta H= -41.2KJ

if the temperature of the system at equilibrium is increased, then the concentration of the H2(g₎ will _______ and the value of kc will_____

for the blanks choose one from the following 

- increase

-decrease

-stay the same 

question 2 

Solid copper(II) sulfate was added to a flask containing water and then stoppered. the following solubility equilibrium was established . 

CuSO_4(s) <---> Cu²⁺_(aq)+ SO₄^2-_(aq)

which of the following observations would indicate that equilibrium has been established?

1. the forward and the reverse reaction have stopped

2. the mass of the solid copper(II) sulfate is completely dissovled

3. the pressure of the system is constant

4. the mass of solid copper(II) sulfate remaining in the flask is constant

a technicion placed 4.0 mol of PO₂Br(g) in a 2.0L sealed container. the following equalibirum established

2PO₂Br(g)<---> 2PO₂(g) + Br₂(g) 

at equalibrium it was determined that the sealed reaction vessel contained 1.8 mol of Br₂(g) 

calculate kc for this equalibirum 

A TECHNICION PLAES 0.50 MOL OF NITROGEN MONOXIDE GAS AND 0.20 MOL IF CHLORINE GAS IN A 1.00L SEALED CONTAINER AT 100 DEGREES CELSUIS. THE FOLLOWING EQUALIBRIUM IS ESTABLISHED AT 4.5 MIN. 

2NO(g) + Cl₂(g) --->2NOCK(g)

the arrow is supposed to be meant as forward and reverse 

THE TECHNICION DETERMIBES THAT AT EQUALIBRIUM THERE ARE 0.30 MOL OF NOCL, 0.20 mol of nitrogen monoxide and 0.050 mol of chlorine gas. 

question 1 

calculate the percent yeild 

question 2 

calculate the equalibrium constant