What are the principal energy level? And what do they represent?
Answer:
the principal energy level of an electron refers to the shell or orbital in which the electron is located relative to the atoms nucleus. the first element in a period of the periodic table introduces a new principal energy level.
Explanation:
the electrons surrounding an atom are located in region around the nucleus called "energy level".
If there is 3% freshwater available on earth, approximately what percentage of it is in ice?
A bicyclist has a mass of 112 kg. In which of the following situations will the cyclist have the most kinetic energy?
A) 10 km / hr.
B) 12 km/hr
C) 14 km / hr
D) 16 km/hr
Answer:
D) 16 km/hr
Explanation:
When the speed increases, the kinetic energy increases, but the mass never changes.
Answer:
d
Explanation:
Which of the following has the highest mass?
O 1 liter
O 1 mole
O 1 gram
1 molecule
Liters are used to measure water and a liter is about as much as a big pop bottle. Moles measure large quantities of small entities, and grams measure small things like salt.
It’s the liter
Although the order of elements is based on atomic number, vertical families share similar chemical properties.
Question 12 options:
True
False WHAT IS IT
Answer:
It's true
Explanation:
Uhhh, the internet! lol.
Answer:
It's true, ExplanationVVVExplanation: Because the order of elements is based on atomic number, vertical families share similar chemical properties.
Which element has 7 valence electrons and 3 electron shells
Answer:
Halogens i think. hope this help
Explanation:
HURRY ANSWER NOW AND I GIVE BRAINLY!!! HURYYY
1. A student left a sealed jar of water outside her home. Water can be a solid, liquid, or gas. When she put it outside, the water was a solid. Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?
Answer:
A. "before the student left, the molecules we're moving in place. After, the molecules we're moving around each other.
Explanation:
Hope this helps. Please mark as brainliest if it did. :)
What are two uses of sulfur?
Answer:
It's used in the vulcanisation of black rubber, as a fungicide and in black gunpowder and a production of sulfuric acid.
Explanation:
Which of the following halogens has the weakest attraction for electrons?
I
F
Br
Cl
Answer:
I
Explanation:
Among the halogens given in this problem, iodine has the lowest attraction for electrons.
This property is known as electronegativity.
Electronegativity is expressed as the relative tendency with which the atoms of the element attracts valence electrons in a chemical bond.
As you go down the periodic group the electronegativity decreases. The most electronegative element on the periodic table is fluorine. Down the group, iodine is the least electronegativeThis is due to the large size of its atom.Balancing Equations
Fe + O2 --> Fe2O3
Answer:
4Fe + 3O2 --> 2Fe2O3
Explanation:
What is one abiotic factor that all biotic factors need to survive??
Answer:
there r mainly three abiotic factors where all biotic factors need to thrust and survive,
They're i) Air
ii) Water
iii) Land
Answer:Water
Explanation:
How did chemists change Mendeleev's periodic table in the early 1900s?
Answer:
They used atomic number instead of atomic mass to organize the elements. From an element's location in the periodic table, you can predict: ... The elements have similar properties.
HELP!!! 2Mg+O2->2MgO
What are the products of this reaction??
WILL GIVE BRAINLEST
Answer:
the products which is formed in the given reaction is MgO ( magnesium oxide )
Explanation:
when magnesium metal reacts with oxygen present in air it burns with a white dazzling flame
to form white powder of magnesium oxide (MgO)
here's the balanced chemical reaction for it
2Mg+O2->2MgO
Have ya helped anybody out today, how? And good job!
Answer:
I helped take care of my baby cousin :)
Explanation:
Someone help please!!!
Which statement describes a physical property to the particles that make up a material
Answer:
Gold is a relatively dense metal because its atoms have more
protons than atoms of many other metals.
Explanation:
Which material has carbon atoms interspersed with iron atoms in its molecular structure?
0 hematite
0malachite
0 bauxite
0 steel
Answer:
steel should be correct
PLEASE HELP I'M BEING TIMED!! Which type of star system has the most stars?
A. Open Cluster
B. globular cluster
C. Eclipsing binary
D. binary star system
Answer:
Hi! It's B - globular cluster
Answer:
B Globular Cluster
Explanation:
Sorry if I am wrong :)
The Princess cruise ship left San Francisco and traveled south for 8 hours at a speed of 30mph. What is the velocity of the ship? Round your answer to the hundreths place
Answer:
v = 300 mph due South.
Explanation:
Given that,
The Princess cruise ship left San Francisco and traveled south for 8 hours at a speed of 30mph.
We need to find the velocity of the ship. It can be calculated by total distance divided by total time taken.
Velocity is a vector quantity i.e. it has both magnitude and direction. On the other hand, the speed has only magnitude (scalar quantity).
In this case it is mentioned that the cruise is travelling south with a speed of 300 mph.
Hence, the velocity is 300 mph in South direction.
2. How many protons are present in the oxygen atom? *
O A. 24
O B.16
O C.8
O 0.4
HELPPP simply the expression!!!!
Answer:
[tex] \frac{3}{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } = \frac{3 \sqrt{3} }{3} = \sqrt{3} [/tex]
when there is a radical in the denominator, we should rationalize (mutiply the denominator and numerator by the radical) to get rid of the radical in the denominator.
Which process produces the energy that powers a solar calculator?
A. Nuclear fusion
B. Chemical decay
C. Radioactive decay
D. Nuclear fission
Answer:
For solar energy, Nuclear Fusion occurs. You can research this for more detail.
Explanation:
Answer:
nuclear fission
Explanation:
An example of a high explosive is what?
Answer:
High explosives do not need to be contained to make their bang. Nitroglycerine, trinitrotoluene, and RDX are high explosives.
Explanation:
ANSWER ASAP
1. NH₄NO₂(s) → N₂(g) + H₂O(l)
1a. Write the number (if any) that should go in front of NH₄NO₂(s), N₂(g), and H₂O(l) in order with commas in between. If there shouldn't be a number, write "no number".
1b. What type of reaction is represented in this equation?
2. Cl₂(g) + KBr(aq) → KCl (aq) + Br₂(l)
2a. Write the number (if any) that should go in front of each compound in order with commas in between. If there shouldn't be a number, write "no number".
2b. What type of reaction is represented in this equation?
3. FeS(s) + HCl(aq) → H₂S(g) + FeCl₂ (aq)
3a. Write the number (if any) that should go in front of each compound in order with commas in between. If there shouldn't be a number, write "no number".
3b. What type of reaction is represented in this equation?
Answer:
Ok:
Explanation:
1a: [tex](no number) NH_4NO_2_{(s)} => (no number) N_2_{(g)} + 2 H_2O_{(l)}[/tex]
1b: Decomposition reaction
2a. [tex](no number) Cl_2_{(g)} + 2 KBr_{(aq)} => 2 KCl_{(aq)} + (no number) Br_2_{(l)}[/tex]
2b Single replacement reaction
3a. [tex](no number)F_2S_{(s)} + 2HCl_{(aq)} =>(no number)H_2S{(g)} + (nonumber)FeCl_2_{(aq)}[/tex]
3b. Double replacement reaction
Explain why Chlorine has the largest electronegativity between Ne, Mg, Ba, Sb, Hg, Li?
Answer:
Look at the image provided and try work it out. I don't have the time but I hope I helped you!
Explanation:
Calculate the pH after 0.13 mol NaOH are added to 1.00 L of 0.50M HC2H3O2 and 0.80M NaC2H3O2 buffer solution, Ka= 1.3 x 10^-5. I really need help, I'm struggling with this topic.
Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green
hoped I helped
(AKS 2e) Group 2 metals bond with nonmetals or polyatomic ions. What question
would a student need to know to form a compound with Group 2 metals? (DOK 2)
Will group 2 elements lose electrons to bond with nonmetals in group 17 in a
1:2 ratio?
Will group 2 elements lose electrons to bond with nonmetals in group 16 in a
2:1 ratio?
Will group 2 elements gain electrons to bond with nonmetals in group 17 in a
1:2 ratio?
Will group 2 elements gain electrons to bond with nonmetals in group 16 in a
2:1 ratio?
Answer:
Will group 2 elements lose electrons to bond with nonmetals in group 17 in a
1:2 ratio?
Explanation:
Metals are electropositive in nature. This means that they loose electrons. Thus, metals form ionic bonds by loosing electrons to non metals.
Elements of group 2 have a valency of 2 while those of group 17 has a valency of 1 so the ratio in which group 2 elements bond with elements of group 17 is 1:2. Hence the answer.
Can anybody help me asap pls
Answer:
Here is ur answer...
Explanation:
2) Half-filled d orbital increases the stability of the element.
How many molecules are in 50.00 grams of sucrose, C12H22O11
Answer: Well take this for an example and see if it helps with 50 grams of sucrose
Explanation:
Explanation:
And we have to calculate the number of moles of sucrose present in a
lb
mass of sucrose:
Moles of sucrose
=
454
⋅
g
342.30
⋅
g
⋅
m
o
l
−
1
=
1.33
⋅
m
o
l
.
Now it is a fact that in a
mole
of stuff there are
6.022
×
10
23
individual items of stuff.........
So
1.33
⋅
m
o
l
×
6.022
×
10
23
⋅
m
o
l
−
1
≅
8
×
10
23
individual
sucrose molecules
Horsetails are helpful for treating
bee stings.
fevers.
urinary tract infections.
bleeding injuries.
Answer:
urinary tract infections. B
Explanation:
