An atomic model shows 19 protons, 20 neutrons and 19 electrons. What is the mass number of the atom? (1 mark) 39
58
19
20
I need help, I finished it 100% (also the girl in red notices me!! 😭)
1.39
2. 9E, 9P, 10N
3. 1 blue sphere 3 white spheres
4. Bonds between atoms
5. They have the same number of electron shells
6. Atomic Orbital
7. Protons repel particles, unlike neutrons.
8. Alkali Metals
9. Arsenic
10. Number of orbitals
11. Silicon and germanium
12. The tendency of an atom to draw electrons into a bond
13. It forms covalent bonds because it wants four extra electrons to share in order to fill its outer shell
14. 3-
15. It has an outer shell half full of electrons, which allows it to form a wide variety of bonds.
16.methyl 1.39
2.one blue sphere and three white spheres
3. Bonds between atoms
4. They have the same number of electron shells
5. They all have the same number of electrons in the outer shell
6. Vinegar
7.3
8. Make a cake
9. A new substance is formed as the battery is used
10. H2O and O2 produced have the same mass as the original H2O2
11:20 a.m.
12. It has the same number of atoms on both sides for each specific type of atom
13. Eight
I hope these answers were correct for all of you. I noticed some of you were saying it was different and the questions didn’t match, so hope this helps. but I think the boy in blue has it all figured out It’s chaos I’ll look for answers elsewhere LOL the first ones (1-5) were good for me but the rest weren’t even options Me. To
Does anyone have the answers to this test????
Help me please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Yk you can check your answer by going to the right I have 11 1. 39
2. one blue sphere and three white spheres
3. bonds between atoms
4. They have the same number of electron shells.
5. They all have the same number of electrons in the outer shell.
6. bake a cake
7. A new substance is formed as the battery is used.
8. The produced H2O and O2 have the same mass as the original H2O2.
9. 20
10. It has the same number of atoms on both sides for each specific type of atom.
11. eight people it’s a practice, you can check your answers by pressing the check answer button 😂 @GoofyProduct
there’s nowhere else smh i give up @boy in blue answer are weird for that nothing like mine Oh i think the first one is 39. That’s all i have Atomic model shows 19 protons, 20 neutrons and 19 electrons. What is the mass number of the atom? (1 mark)
39
58
19
20
To create a molecular model, a student will use blue spheres to represent nitrogen (N) and white spheres to represent hydrogen (H). Which option correctly describes a model of ammonia, NH3? (1 mark)
three blue spheres and one white sphere
three blue spheres and three white spheres
one blue sphere and three white spheres
a blue sphere and a white sphere
A ball-and-stick model of a formaldehyde molecule, CH2O, is made up of the following components:
a black ball
a red ball
two white balls
three sticks
What do the sticks represent?
(1 mark)
oxygen atoms
bonds between atoms
hydrogen atoms
carbon atoms
Potassium and nickel are in the same row of the periodic table. What do these elements have in common? (1 mark)
They have similar physical properties.
They have a similar reactivity.
They have the same number of valence electrons.
They have the same number of electron shells.
Why do elements in the same group of the periodic table share similar properties? (1 mark)
They all have the same number of electrons in the outer shell.
They are all very reactive with other elements.
They all have the same atomic mass.
They are all metals.
Which option is an example of a chemical change? (1 mark)
slice an apple
tear the paper into pieces
boiling water
to make a cake
A scientist uses a lithium-ion battery to power her laptop. Which battery statement is correct? (1 mark)
The mass of the battery increases when recharged.
A new substance is formed as the battery is used.
Electrons are lost to the environment when the battery is used.
Lithium atoms are created when the battery charges.
Use the chemical reaction to answer the question.
2H2O2→2H2O +O2
2
H
2
O
2
→
2
H
2
O
+
O
2
Which statement about reaction is correct?
(1 mark)
H2O and O2 have the same mass as H2O2.
H2 and O2 atoms are lost during the reaction.
The reaction creates new atoms of H2O and O2.
H2O2 has the same properties as H2O and O2.
Suppose 20 atoms of hydrogen (H) react with chlorine (Cl) to produce 20 molecules of hydrochloric acid (HCl). According to the law of conservation of matter, how many chlorine atoms reacted with hydrogen? (1 mark)
40
20
ten
0
What does it mean for a chemical equation to be balanced? (1 mark)
It has the same type of molecules on both sides.
It has the same number of molecules on both sides.
It has the same type of atoms on both sides.
It has the same number of atoms of each element on both sides.
How many atoms are represented in the formula Na2HPO4? (1 point)
new
six
four
eight
I need help !!!!!!!!!!! @connexus student is right guys. It has lol verification reply option. But yes thank you @boy in blue because you helped anyway. @ Boy In Blue, Ty so much! When would you have taken the test, classmate, everything he checked, you should do it right. OMG THANK YOU YOUR LOTS OF BOY IN BLUE!!!!! Thank you anonymous! It helped a lot What a lesson is even this one. some of them are just random answers. what the hell is that, man, you got it wrong, they changed the questions. @anonymous is 100% right 13/13!!! Idk I didn’t look because I had a button that showed if the answers were right or not, I just got 4 wrong, so good luck – it’s a practice that means you can check the answer to make sure that your answer is correct… The answers for The Properties and Online Practice of Atomic Structure are:
1.D
2.A
3.D
4.D
5.C
6.B
7.C
8.A
9.C
I promise these answers are 100% correct
(by the way, these are for students going to Connexus Academy online) I don’t do comprehensive tests. The mass number is 39 for the first.