Question

Besides protons, what other particles make up an atom? Write 2 - 3 sentences identifying the attractive forces that act between a proton and each of these other particles.

Answer 1

Besides protons, neutrons and electrons make up an atom

Answer 2

good, what about the attractive forces between

protons + electrons
and
protons + neutrons?

Answer 3

The attractive forces between protons and electrons cancel out. The attractive forces between protons and neutrons attract?

Answer 4

it asks to identify what the forces are so what are the names of the forces between
protons + neutrons
and
protons + electrons?

Answer 5

The attractive forces between protons and electrons is called an electrostatic force The attractive forces between protons and neutrons is called a strong nuclear force.

Answer 6

good that's it

Answer 7

Using a periodic table, identify the element whose atoms have 11 protons. Is it a metal, a nonmetal, or a metalloid? Write 1 - 2 sentences describing how an atom of this element changes when it forms an ionic bond.

Answer 8

any attempts so far?

Answer 9

ptable.com is a periodic table, find element 11 and identify whether it's a metal/nonmetal/metalloid based on its location, then that will tell you how it behaves during bonding

Answer 10

The element whose atoms have 11 protons is a metal

Answer 11

good

it would also be a good idea to write what the name of the element is

Answer 12

The element whose atoms have 11 protons is named Sodium and it is a metal

Answer 13

It is very reactive

Answer 14

good, and during ionic bond formation does it lose or gain electrons?

Answer 15

lose

Answer 16

actually gain

Answer 17

other way around, since it only has 1 e- in its outer shell it has to lose them

so there you have it: sodium, metal, loses electrons during ionic bonding

Answer 18

A robotic submersible is being brought back on board a ship. What happens to the buoyant force as the submersible is lifted out of the water? Write 2 - 3 sentences explaining your reasoning.

Answer 19

well, buoyant force is proportional to the amount of water being displaced by the object, when an object is being raised, water gets displaced below the object, thus exerting an upwards force on the object, raising the object

Answer 20

so the buoyant force should increase

Answer 21

If 0.45 kg of iron at 140°C is added to 1.5 kg of water at 22°C, what will be the final temperature of the system?

Answer 22

q = mc delta T

the iron is losing heat and the water is gaining heat

therefore

[m_iron][Ciron](Tf-Ti) = [m_water][Cwater](Tf-Ti)

convert the temperatures to kelvin
find the appropriate values of C for iron and water
find the appropriate values of m for iron and water

plug and solve for Tf

Answer 23

actually nvm about the Kelvin thing, you can find specific heat in terms of kg and degrees C

Answer 24

any progress?

Answer 25

no :/

Answer 26

specific heat of iron = 450J/kg
specific heat of water = 4186J/kg

Answer 27

plug in the mass of the iron
the mass of the water
the initial T of the water
the initial T of the iron

[m_iron][Ciron](Tf-Ti) = [m_water][Cwater](Tf-Ti)

solve for Tf.

Answer 28

[m_iron][Ciron](Tf-Ti) = [m_water][Cwater](Tf-Ti)

0.45*140=1.5*22

Answer 29

your equation is not complete. You are missing (Tf-Ti) on both sides. You also used the wrong value for Cwater.

Answer 30

0.45*140(f-0.45)=1.5*22(f-1.5)

Answer 31

Ti is the initial temperature not the mass

Also, Cwater is not 22

Answer 32

0.45*140(f-140)=1.5*1.5(f-22)

Answer 33

?

Answer 34

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid
specific heat of iron = 450J/kg
specific heat of water = 4186J/kg
\(\color{#0cbb34}{\text{End of Quote}}\)

Answer 35

0.45*140(f-140)=1.5*4186(f-22)

Answer 36

good

forgot to mention that the iron is losing heat and the water is gaining heat so there needs to be a negative sign on the iron side

-0.45*140(f-140)=1.5*4186(f-22)

solve for f

Answer 37

23.17

Answer 38

good (didn't get the notification for some reason ;_;)

Answer 39

and it would be degrees c right?

Answer 40

yes