Answer:
See explanation
Explanation:
Atomic size increases down the group due to the addition of more shells.
As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.
Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.
7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place?
A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA
Answer:
Answer is Alveoli
Hope it helps.... plz mark as brainliest
as water cruise to a temperature of zero degrees Celsius and form ice water molecules tend to
A. move faster apart
B. vibrate rapidly
C. flow more randomly
D. gradually expand
Answer:
B. vibrate rapidly
Explanation:
Mark above answer as BRILLIANT
A physical property tells how a substance changes into a new substance
Answer:
false
Explanation:
A sample of water is heated from 60.0 °C to 75.0°C by the addition of 140 j of
heat. What is the mass of the water?
work too pls !!!
Mass of the water : 2.23 g
Furter explanationHeat
Q = m.c.Δt
m= mass, g
c = heat capacity, for water : 4.18 J/g° C.
ΔT = temperature
Q= 140 J
Δt = 75 - 60 = 15
mass of the water :
[tex]\tt m=\dfrac{Q}{c.\Delta T}=\dfrac{140}{4.18\times 15}=2.23~g[/tex]
How do volcanos such as ojos del salado form?
Answer:
Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt.
Explanation: hot molten rock, ash, and gases escape from the volcano
can someone please give me a very simple definition of nuclear fusion make it as simple as possible
Answer: Nuclear fusion is a nuclear reaction where atomic nuclei of a low atomic number fuse to form a heavier nucleus releasing energy.
Explanation:
The correct name for the molecule 14Cl7 is:
a. triiodide heptachloride
b. lodine chloride
c. tetraiodine heptachloride
d. quadiodine septachloride
How many electrons does gallium give up when it becomes an ion?
Answer:
3 electrons comrade
Explanation:
Explain in your own words what the law of conservation of mass means
Answer:
Mass can neither be created nor destroyed in a chemical equation, it transfer from one to another form.
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
There are five objects (a pink object, a yellow object, a white object, a gray object, and a violet object). Each object has a different mass (28.7 g, 41.6 g, 8.7 g, 30.4 g, and 76.9 g) and a different volume (11.6 cubic cm, 57.4 cubic cm, 14.9 cubic cm, 29 cubic cm, and 57 cubic cm). The masses and volumes listed above are not in any particular order, they are listed randomly. Use the clues below to figure out the mass, volume, and density of each object. Construct a table to display your data. 1. The volume of the yellow object is not 29 cubic cm and it is also not 57.4 cubic cm. 2. The white object has a greater mass than the pink object. 3. The gray object has a density of 1.349 grams per cubic cm and a mass of 76.9 g. 4. The density of water is 1.0 gram per cubic cm. If the white object was placed in water, it would sink. 5. The density of water is 1.0 gram per cubic cm. If the yellow object was placed in water, it would float. 6. The density of aluminum is 2.7 grams per cubic cm. The violet object is more dense than aluminum. 7. One object has a volume of 57.4 cubic cm and a density of 0.5 grams per cubic cm. 8. The volume of the violet object is not 11.6 cubic
Which element below would have a 3+ charge as an ion?
Answer:
Al3+
Explanation:
Aluminium has an electronic configuration of 2, 8, 3 and the outermost valence electrons is +3 since it is a metal
Elements acquire positive or negative charges by losing or gaining electrons. The element which have 3+ charge among the options is boron (B) Hence, option B is correct.
What is boron?Boron is 5th element in periodic table and it is classified into 13th group. Boron is a metalloid and shows properties intermediate to metals and non metals.
The electronic configuration of boron is K =2, N =3. Atoms lose or gain electrons as per their valency to become stable. According to octet rule atoms become stable when their valence shell get completely filled.
Boron have 3 electrons in its valence shell. If it donate these three electrons into an electronegative atom, its K shell become its valence shell and it is completely filled. Thus boron becomes stable.]
When atoms loses electrons they acquire positive charge and this charge is numerically equal to the number of electrons lost. Thus boron acquire 3 unit of positive charge by donating its 3 electrons. Hence, option B is correct.
To find more about boron, refer the link below:
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Your question is incomplete. But your complete question probably was :
Which element below would have a 3+ charge as an ion?
answer choices.
nitrogen (N).
boron (B).
silicon (Si).
argon (Ar)
Suppose while walking along the beach, you find a green crystal. Which properties could you use to determine whether the crystal is an emerald?
Explanation:
Emerald is defined by its green color. To be an emerald, a specimen must have a distinctly green color that falls in the range from bluish green to green to slightly yellowish green. To be an emerald, the specimen must also have a rich color.
is this a balanced equation?
Answer:
C6 H12 O6 +6 O 2 → 6 CO2 + 6 H2 O
The energy released in cellular respiration helps an athlete perform. How do you think an athlete might be able to increase cellular respiration?
pls i will give brainliest
eating healthy foods
working out and eating healthy helps
Answer:
higher as
beacause having a healthy diet inproves
your health
Explanation:
Choose the electron configurations which are possible for an unexcited atom. Example 1 – 1s22s22p4 Example 2 – 1s22s22p63s23p33d1 Example 3 – 1s22s22p83s1 Example 4 – 1s22s22p63s1
Answer:
Examples 1, 3 and 4
Explanation:
An unexcited atom is an atom in the ground state i.e the atom has it's valence electrons in it's lowest energy level possible. This actually implies the normal electronic configuration of the atom. Thus, examples 1, 3 and 4 have the actual electronic configuration with there valence electrons in the lowest possible energy level.
Example 1: 1S² 2S² 2P⁴
Example 3: 1S² 2S² 2P⁶ 3S¹ (There seem to be a mistake in the question provided, P energy level can only 6 electrons not 8)
Example 4: 1S² 2S² 2P⁶ 3S¹
NOTE: If you take a look at example 2, it will be deduced that the 3P energy level has only 3 valence electrons and the last valence electron jumped to 3d energy level; making that atom appear to be in it's excited state.
write the number 3000,000,000 in scientific notation
Answer:
3 x 10^9
Explanation:
which of the following actions would cause the volume of the chamber below to increase to 36.0 L?
Answer:
Option C. Triple the number of moles
Explanation:
From the ideal gas equation:
PV = nRT
Where:
P is the pressure
V is the volume
n is the number of mole
R is the gas constant
T is the absolute temperature.
Making V the subject of the above equation, we have:
PV = nRT
Divide both side by P
V = nRT / P
Thus, we can say that the volume (V) is directly proportional to both the number of mole (n) and absolute temperature (T) and inversely proportional to the pressure (P). This implies that and increase in either the number of mole, the absolute temperature and a decrease in the presence will cause the volume to increase.
Thus, the correct option is option C triple the number of moles. This can further be seen as illustrated below:
Initial volume (V1) = 12 L
Initial mole (n1) = 0.5 mole
Final mole (n2) = triple the initial mole = 3 × 0.5 = 1.5 mole
Final volume (V2) =?
From:
V = nRT / P, keeping T and P constant, we have:
V1/n1 = V2/n2
12/0.5 = V2/1.5
24 = V2/1.5
Cross multiply
V2 = 24 × 1.5
V2 = 36 L.
Thus Option C gives the correct answer to the question.
Which statement describes the charging method shown?
The spheres are charged through friction.
The spheres develop the same charge.
Electrons move from the rod to Sphere A.
Electrons move from Sphere A to Sphere B.
Answer:
D
Explanation:
correct on edge 2021 :)
The movement of the electrons from sphere A to sphere B is shown as the charging method. Thus option D is correct.
What is an electron?An electron is a negatively charged subatomic particle and can either be free or bound to the nucleus and it exists in a spherical shell. of the various radii that represent the energy levels. The movement of the electron from sphere one to sphere two is represented by the image.
Find out more information about the charging method.
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The more quickly you change your _____, the more ____ you will have to exert
Answer:
name, force
Explanation:
Which of the following contains the most atoms?
24.305 g Mg
39.098 gk
21.62 g B
9.0122 g Be
Explanation:
9.0122 g be Maybe, sorry i don't think so
In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.
What is atomsThe molar mass of each element can be found on the periodic table.
The molar mass of Mg (magnesium) is about 24.305 g/mol.The molar mass of K (potassium) is about 39.098 g/mol.The molar mass of B (boron) is approximately 10.81 g/mol.The molar mass of Be (beryllium) is about 9.0122 g/mol.To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:
For Mg: Number of moles = 24.305 g / 24.305 g/mol = 1 moleFor K: Number of moles = 39.098 g / 39.098 g/mol = 1 moleFor B: Number of moles = 21.62 g / 10.81 g/mol ≈ 2 molesFor Be: Number of moles = 9.0122 g / 9.0122 g/mol = 1 moleTherefore, the sample with 21.62 g of boron (B) contains the most atom
Read more about atoms here:
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Water is added to a test-tube containing dilute NaOH of pH 11. What could be the pH of the resulting solution?
Answer:
NaOH atomic mass is 39.977
pH is 11 due to dilution must be multiplied by 0.11 to find pH
39.977 x 0.11 = 0.43979 x 100%
43% pH
materials that are eroded from one location are always ?
i really need these answered!!
Explanation:
3)
Equation -
3F₂ (g) + 2AlBr₃ (s) → 3Br₂ (l) + 2AlF₃ ↓
4)
When sulphur dioxide gas reacts with oxygen then it forms sulphur trioxide gas.
Equation -
2SO₂ (g) + O₂ (g) → 2SO₃ (g)
Evaluating Lewis Structures
Explain what is wrong with the following structure.
An upper H is single-bonded to a H to the right, which is single bonded to an upper O with pairs of dots above, to the left, and below.
Answer:
Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time.There are too many electrons in the final structure.
Explanation:
Answer:
Explanation:
Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time. There are too many electrons in the final structure.
i need to know what word goes into that the words are in each sentence plz help me i will give brainliest thank you :)
Answer:
im taking these points baby lol
Explanation:
i love you <3
write the name of and molecular formula of compound which gives hydrogen ion and chloride ion in the solution state. in which colour is the methyl orange changed after treating it with this compound. why? write the name of salt when the compound is treated with lime water. write the chemical equation.
The common charge on an atom in group 17 would be....
+1
+7
-7
-1
+17
ñ How many total electrons does 0-2 (an oxide ion) have?
Explanation:
1one electron and -1 for anions
2 O2- indicates an ion of oxygen having two extra electrons. I.e., since an oxygen atom normally has 8 protons and 8 electrons, this ion has 10 electrons (-10 charge) and 8 protons (+8 charge) giving it a charge of -2 (-10 + 8 = -2).
...
Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases
Please help me with these questions... please..
Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices
A.boron
B.carbon
C.hydrogen
D.beryllium
What would you name this new element?
Answer:
3 valence electrons
The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.
Explanation:
Nihonium has to be the #113 element of the periodic table
A. is the correct answer because Boron has 3 electrons too,
All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.
Boron element would have properties most similar to the new element. Therefore, option (A) is correct.
Why do the elements of same group have similar chemical behavior?The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.
The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.
Therefore, both Boron and a new element with atomic number 113 have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.
Learn more about elements with similar chemical behavior, here:
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There are _____ Chemical families in the periodic table.
Explanation:
18
In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.