CHECK MY ANSWERS!!!!!!!
1) Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct?(1 point)
A. The model should show 27 protons and 32 neutrons.******
B. The model should show 59 protons and 27 neutrons.
C. The model should show 27 protons and 27 neutrons.
D. The model should show 32 protons and 59 neutrons.
2) In a molecule of lithium sulfide, there are two atoms of lithium and one atom of sulfur. Which statement about lithium sulfide is correct?(1 point)
A) The chemical formula for lithium sulfide is LiS2.
B) The atoms in lithium sulfide are held together by bonds.*****
C) Both lithium and sulfur form positive ions.
D) A molecular model of lithium sulfide would have two spheres.
3)Which element has the same number of valence electrons as bromine (Br)? (1 point)
A) ytterbium (Yb)
B) selenium (Se)
C) krypton (Kr)******
D) astatine (At)
4) Why are sodium (Na) and potassium (K) in the same group on the periodic table?(1 point)
A) They have similar reactivity.*******
B) They are both hard and brittle.
C) They have similar atomic weights.
D) They are both colorless.
5) A student cuts some fabric into two pieces. Is this change physical or chemical?(1 point)
A) It is a chemical change because there is no phase change.
B) It is a chemical change because the size changes.
C) It is a physical change because the process is reversible.
D) It is a physical change because there is no reaction.******
6) How are chemical changes different from physical changes?(1 point)
A) They form new substances.********
B) They are reversible.
C) They involve heat.
D) They include shifts in the phase of matter.
7)A scientist makes several observations about a chemical reaction and records them in the table shown. Which observation contains an error? (1 point) picture added!
A) 1
B) 3
C) 2******
D) 4
8) In a chemical reaction, hydrofluoric acid (HF) and sodium hydroxide (NaOH) combine to form sodium fluoride (NaF) and water (H2O). The reaction uses 20 grams of hydrofluoric acid and 40 grams of sodium hydroxide, and it produces 18 grams of water. How much sodium fluoride does the reaction produce?(1 point)
A) 60 grams
B) 42 grams
C) 18 grams******
D) 78 grams
9)Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
A) Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.
B) Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.********
C) Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
D) Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
10) One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the products?(1 point)
A) two******
B) four
C) three
D) six
11) Use the unbalanced chemical equation to answer the question.
2NaHCO3 → Na2CO3 + CO2
What can be added to the products to balance the equation? (1 point)
A) CH2OH****
B) H2O
C) H2
D) O2
12) The chemical formula for phosphorus trichloride is PCl3. In one to two sentences, explain how you would build a ball-and-stick model of phosphorus trichloride. Include a description of the parts of the model.(2 points)
13) Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the chemical equation. A scientist adds 4 grams of Cu to 2 grams of S to start the reaction. At the end of the experiment, she has 6 grams of product. In one to two sentences, explain what would happen if the scientist increased the amount of copper to 6 grams, and why. (1 point)
1. The model should show 27 protons and 32 neutrons.
2. The atoms in lithium sulfide are held together by bonds.
3. astatine (At)
4. They have similar reactivity
5. It is a physical change because there is no reaction.
6. They form new substances
7. 1
8. 42 grams
9. Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
10.six
11. H20
12 and 13 on your own:)
1. The model should show 27 protons and 32 neutrons
2. The atoms in lithium sulfide are held together by bonds.
3. Chlorine
4. They have similar reactivity
5. It is physical change because there is no reaction
6. They form new substances
7. It shows that no atoms have been gained or lost during the reaction
8. 58.44 amu
9: find the mass of a pride of ice. Key the ice melt. Find the mass of the liquid water.
10. Six
11. H2O
12 and 13. Do it yourself.
Did someone say... family?
i promise this is 100% correct
1. The model should show 27 protons and 32 neutrons.
2. The atoms in lithium sulfide are held together by bonds.
3. chlorine (Cl)
4. They have similar reactivity.
5. It is a physical change because there is no reaction.
6. They form new substances.
7. 1
8. 42 grams
9. Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
10. six
11.H2O
im sorry but ever since jiskha got updated i really cant find a ton of questions
Aright. I'ma be nice. FOR ONE TIME. ONLY. EVER. Then I'ma go back to repossessing Jack. OKAY?! Here are the best answers I can give yah.
1. The neutron has a negative charge and is found in the nucleus.
2. The model should show 27 protons and 32 neutrons
3. because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits
4. The atoms in lithium sulfide are held together by bonds.
5. Astatine (At)
6. atomic number
5. low-energy alpha particles passing through a field of high mass-number-particles
7. Metals can be hammered into thin sheets, and nonmetals are brittle.
8. polonium (Po)
9. silicon (Si)
10. Hydrogen has one electron and one proton.
11.Barium has fewer valence electrons, but they are in a higher energy level.
12. Barium has more valence electrons, and they are in a higher energy level. (Maybe?)
13. An ionic bond is likely because they will want to give away two valence electrons in order to become stable.
14. 2-
15. four
16. OH
17. methyl
18. You could use a red ball for P and 3 yellow for CI. (Change The Colors, wink wink.)
19. For Instance, Neon (Ne) has an atomic number of 11. It has a completely full Shell of electrons. But Sodium has 1 more proton, AND one more electron. That extra electron is in the outside shell, making a VALENCE electron. (ParaphraseortheywillfindoutandthenyouwillbeDED.)
20. On the table metals, (which you can find on the left side) the metals will be positive. On the right side, the NON-metals will be negative. (againyoubetterparaphraseyoulittlesonsof)
Well, that's all, I'm of to mess with jack. (I swear, if he buys one more tub of antiseptic cream for Christmas for me, i'ma SNAP.)
Question 12 Answer
If you have red balls for phosphorus, the sticks for bonds, and white balls for trichloride, then you would need 1 red ball, 3 sticks, and 3 white balls. the sticks will connect all of the molecules together, with the red ball as the base and then a white ball sticking out of 3 different spots.
here some awnsers bc yea
this for ppl who use Conexxus i flunked the test so im just gunna grab awnsers from the awnser key at the end :>
1.The model should show 27 protons and 32 neutrons.
2.The atoms in lithium sulfide are held together by bonds
3.chlorine (Cl)
4.They have similar reactivity.
5.Vinegar
6. 1
7. It is a physical change because there is no reaction.
8.They form new substances
9. 1
10. 42 grams
11. Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
12. six
13. H2O
14 - 15 are writing questions good luck on those endings :> sry if you got these wrong bc they changed the awnsers
^^1,9,11,12 are wrong
1. the neutron has a negative charge and is found in the nucleus
9. vanadium(v)
11. hydrogen doesnt have any neutrons
12. francium has fewer valence electrons, but they are in a higher energy level
everything else is good! ty anti, have fun messing w jack<3
Good Morning to everyone! I hope for you to read this and understand. DONT listen to the ones with all the answers because everyone's test is different. I'd advise you to search all the answers one by one. It may take a long time but at least you have a chance of getting them right. And for Connexus girl she had the answers for people who use Connexus so if you dont use Connexus then they're probably wrong. Think before you do is what I'll advise to you.
And good day!
There all randomized what are The acttually word answers?
Question 13 Answer
You can weigh the reactants. The mass and products will be the same.
AGAIN DON'T USE MY ANSWERS WORD FOR WORD!!!!!!!!!!!
looks like we are a family now...
i would stop this madness but im in too deep and i messed up by not paying attention in real school now I'm too far behind to just stop cheating
The most important thing in life will always be family.
heres help for 12
A model aids in visualizing a molecule and understanding its properties.
In chemistry, models of molecules give us an idea about the arrangement of atoms in the molecules. Usually, the arrangement of atoms in a molecules determines the kind of reactions that the molecule can undergo.
Models are three dimensional representations of what molecules look like. They help us to conceptualize the possible orientation of atoms and groups in the molecule.
alexa, your answers were mostly wrong. i got wrong answers. to anyone who sees this, DONT USE HER ANSWERS.
:) is right!!! tysm
I really need help with 12! Can someone pls help me?
OMGGG I HAVE A DIFFERENT TEST BRO CAN YALL HELP
ik uts it hard and teachers like only give you like and boom they think you know the whoal test well no its hard sometimes to do tests and i dont study soooooo is not ceating its checking your answers and if you tell us stop checking then why you on here agian NOT CHEAT WERE CHECKING
what is right can people just say what the answer is or questions and not just spam pleasd
shot gun
yo katelyn all those answers are wrong
Yay! Thank you :)!
DO NOT SUBMIT THE TEST IF YOU ANSWERED WITH uhhhh’s ANSWERS I GOT 4/15
DON'T USE MY ANSWER DIRECTLY. CHANGE IT UP!!!!!!!!!
Someone please help Im really confused and I bet all of y'all are too
man I don't understand 13 AT ALL
🧃🧃 number 12 was actually wrong, but thank u for the rest!!!!
haha ok but did you know that I'm a box of mints
OMG, What is the answer for 12 and 13 once I get them I will share all of my answers!!
AND I HAVE 13 QUESTIONS
Yeah they changed number 8, tbh idk what to do now :/
Thanks @The Connexus Girl buff I think you're right. I'll do that right now. Thanks! <3
im sorry but i cant find the question
there randomized smh so prob not correct.....maybe sum
The answer that :) forgot to type is 2, it is actually question 8, I guess they shifted
Correct answer 100%
The same ones everyone else said but 8 is 58.44 and 9 is find the mass of a peice of ice let the ice melt find the madd of the luquid water
Guys come on we need to work together to make sure that we have a good grade come on guys let's do this
Help!! I HAVE 15 QUESTIONS UHG
one number three if it says:
Which element has the same number of valence electrons as bromine(Br)?
selenium (Se)
krypton (Kr)
potassium (K)
chlorine (Cl)****
Thank you Äñ↑ΊèÞ†íçé¥ë, and 🧃🧃 was right abt 1, 11, and 12. Idk abt 9 bc I had a different question and y'alls answers weren't options for me but thank y'all so much!
K <3 is 100 percent right
My question 9 says "How does a balanced chemical equation demonstrate the Law of Conservation of Mass?"
uh....are they correct or wrong...which one's are correct and which one's are wrong? Please let me know!!!!
@uhhh is completely worng
@Connexus girl, i would but im also stuck on that question right now.
What are the answers to the whole test tho
damn 22 hours ago
these people saying stop cheating this and that!!1! are actually so annoying like dude quit worrying about others and worry about yourself because clearly you guys just like to ruin the mood and stupid stuff like so what if people are cheating? its not your business and you're just making them feel worse, besides other people dont cheat and they actually check their answers so quit tryna act smart if you dont know anything.
are These wrong
answers]
omg what is 12 and 13 !>:(
Awesome. Hope it works out for you all. And I will, Double juice man.
True Dat
Pls help.
Thanks so much Andrew!
I suggest people use quillbot.com for paraphrasing and check-plagiarism.com for check plagiarism.
Am i the only one with 14 questions? lmao
My answer for 12: Because it is easier to envision what a molecular structure may look like while we can see the structure instead of completely being guesses nobody has in common.
13: Because he added the reactants' mass together, and the Law of Conservation of Mass states that no atoms may be created or destroyed, only change.
PARAPHRASE! DO NOT USE WORD FOR WORD!
Also, to the no cheating people, kinda hard when you're lucky when the teacher teaches relevant information, plus you gotta admit cheating's the reason why you're here, hypocrites.
honey bunny which ones are right
bruvvvvv
I have 13 questions helpp
what's the answer for 12 and 13
i need help for 12 and 13. i have the test with only 13 questions
bro if people are still going to ask answers to 12 and 13 then I rather you really read the question and come up with your own answers.
y'all these teachers change the answer each time so you cant take others answers so i would recommend searching each question and then brainy will pop up and just click on it and READ THE QUESTION THAT WAS ASKED FIRST!!!then get the answer also it is easy to get caught cheating they can see you history for connexus so make sure you use a different email or guest browser :) always here to help
lol imagine being on some weird post
@answer me darnit nope she is wrong
first of all what are the answers
did anyone get anything?
Yo can anybody give me their response for 13?
K <3 is completely correct for CCA
For 12 something along the lines of having an object to have makes It easier to understand it
I HAVE 9 QUESTIONS
Use the periodic table to answer the question.
An illustration shows the periodic table.
Which element has the same number of valence electrons as bromine (Br)?
(1 point)
Responses
chlorine (Cl)
chlorine (Cl)
potassium (K)
potassium (K)
krypton (Kr)
krypton (Kr)
selenium (Se)
bruh 14 and 15 you all guys do own test means matter interactions unit test if you guys get wrong that is your problem
idk @popi;)
I know the first anwer it's the the model should show 27 protons and 32 neutrons
thank god I have a smart sister
has anyone actually taken it yet and found out the correct answers?
I reposted the entire question at the top of the page under "science--repost for Alexa by DrBob222. It may not be the first question by the time you look at it but it will be somewhere near the top of the page.
are they correct
are they correct or not?
is they right
I just wanted to let yall know that im leaving Jishka for good, one I dont want to change it, and two I dont feel right cheating.. I want to feel proud for my grades. Becides, I dont want to get caught. hopefully someone else reads this, and figures out cheating is not okay.
1.D
2.B
3.D
4.D
5.C
6.A
7.D
8.C
9.D
10.D
11.C
12.If you have red balls for phosphorus, the sticks for bonds, and white balls for trichloride, then you would need 1 red ball, 3 sticks, and 3 white balls. the sticks will connect all of the molecules together, with the red ball as the base and then a white ball sticking out of 3 different spots.
13.You can weigh the reactants. The mass and products will be the same.
AGAIN DON'T USE MY ANSWERS WORD FOR WORD!!!!!!!!!!! :)
Are these correct
ARE THEY CORRECT I NEED TO KNOW NOW
bruvvvvvv is this correct or not i really need to knowwwww
are they right ?
It's one of the many problems brought on by the changes in this forum. Sorry you lost it. For fear of you losing it again, I will try to repost this question at the top of the page, answer it, and perhaps you will see it before it disappears.
is uhhhh correct
I'm befuddled. This is the same question(s) Damon and I answered yesterday including the same typos, omitted information, etc. What goes?
You don't think your teachers know you are cheating when you literally copy the short answers word for word.
you guys need to stop cheating right now. if you keep going like this ur not gonna get anything. how are you gonna get a job? by cheating? no! do u think ppl in college will let u cheat? ur actions have consequences, just stop. if u need help there is always ur teachers.
uhhhhh is definitely not correct at all i got two right 😭😭the ones taht she does have right are 7 which is b and 8 which is also b.
Correct answers are
1.c
2.c
3.a
4.b
5.a
6.c
7.b
8.b
9.b
10.d
11.c
and then the last two are on your own. Yw btw
for connexus kids
1. b
2. b
3. b
4. c
5. c
6. a
7. b
8. b
9. c
10. c
11. d
12 and 13 you answer on yr own < 33