There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. If an element with no electrons to share belongs to noble gas family.
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Noble gas is the group 18 elements whose octet is complete and they are not ready to give or take electrons from other element. They are very much stable on its own.
Therefore if an element has no electrons to share and is stable then that element belongs to group 18 or noble gas family.
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How do solar panels create an electric force field and generate an electric current?
Answer:
Sunlight hits the solar panels, and creates an electric field. The electricity generated flows to the edge of the panel, and into a conductive wire. The conductive wire brings the electricity to the inverter, where it is transformed from DC electricity to AC, which is used to power buildings.
Answer:
Sunlight hits the solar panels, and creates an electric field. The electricity generated flows to the edge of the panel, and into a conductive wire. The conductive wire brings the electricity to the inverter, where it is transformed from DC electricity to AC, which is used to power buildings.
Explanation:
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How do core electrons relate to the ionization energy of the atom?
Answer:
For any given element, ionization energy increases as subsequent electrons are removed. For example, the energy required to remove an electron from neutral chlorine is 1251 kJ/mol. ... An even sharper increase in ionization energy is witnessed when inner-shell, or core, electrons are removed.
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Which of the following substances contains a covalent bond?
a. NaCl
b. SO2
C. CaO
d. MgCl2
Answer:
B. SO2
Explanation:
An Ionic bond transfurs electrons and occurs with metals and nonmetals
Covalent is the sharing of electrons and occurs with nonmetals only.
The plant on the left is growing more because it has been receiving more water
Answer:
uhhh well ig btw what plant
Explanation:
it would be more sunlight to
Present Your Findings
1. Make a graph of the data collected.
a. Label the x-axis as time.
b. Label the y-axis as the number of undecayed atoms.
c. Be sure to title the graph.
d. Turn the graph into your teacher.
2. Write a summary paragraph discussing this experiment and the results. Use the following questions to help guide the
content of your paragraph.
a. What was your hypothesis? According to your data, do you think your hypothesis was correct?
b. What is a half-life?
c. When does a radioactive sample emit the largest number of decay particles? Why is this information important?
(How can it be applied in our world today?)
d. Do you think the shape of the curve on your graph would change if you increased the half-life to 20 seconds?
What does this reveal about radioactive decay?
e. Do you think the shape of the curve on your graph would change if you started with a smaller sample, say 50
atoms (pennies)? What does this reveal about radioactive decay?
Answer: To your project!!
Experiment Half-Life
a. My hypothesis is that when we get through 6 half-life’s you will be left with no atoms, and each time the atom number will decrease. Half of my hypothesis was correct whilst the numbers did decrease we, after 6 trials were left with one undecayed atom.
b.what is a half life?
the time required for the decay of one-half of the atoms in a sample of radioactive material
c. When does a radioactive sample emit the largest number of decay particles? when it first starts to decay
Why is this information important? Half-Life and decay is important today because it helps us determine the date of death and birth of ancient mummies.
d. Do you think the shape of the curve on your graph would change if you increased the half-life to 20 seconds? Yes different data would arise and that would change the graph.
What does this reveal about radioactive decay? The longer a material or substance takes to decay the larger the amount of decayed material or substance will come from the substance
e. Do you think the shape of the curve on your graph would change if you started with a smaller sample, say 50 atoms (pennies)? Yes, again different data would arise and that would change the graph.
What does this reveal about radioactive decay? The smaller the sample the quicker it will decay. And the less product that comes from the sample.
Your project is done, it worked for me hope it does for you? DON'T USE THE EXACT SAME WORDS IT'S SUS
here is the graph too!
Answer:
Hey I dont know if you got the same project as me but I had to record pennies and make a graph so I recorded pennys here
Explanation:
first half-life = tails 49 : heads 51
second half-life = tails 19 : heads 29
third half-life = tails 8 ; heads 11
fourth half-life = tails 2 ; heads 6
fifth half-life = tails 1 ; heads 1
sixth half-life = I didnt know what to say so I put 1
hope this helps someone
What would happen if we couldn't carry respiration out?
Answer:
There would be no energy for cellular activities
Explanation:
Cellular respiration is the process whereby living organisms breakdown ingested food in their cells in order to obtain energy in form of ATP. In other words, respiration converts the stores energy in food molecules into usable energy by the cell. The general equation of the process is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O
The process of cellular respiration is carried out by every living organism in order to obtain energy to perform their various metabolic activities. Hence, without RESPIRATION, there would be no energy (ATP) for use by the cell, which utterly means no cellular activities will take place.
ANYONE PLEASE!!! MORE HELP ON THIS!!! all you have to do is say if it is ionic, binary, covalent or an acid. remember i give all my points to whoever is the most helpful!!!
11. N2S
12. SeF2
13. AsCl3
14. HClO
15. Be(OH)2
16. SO3
17. KMnO4
18. HClO4
19. Cu2S
20. BF3
21. H2SO4
22. CaI2
23. Pb3(PO4)2
24. HCH3COO
25. Ca(CH3COO)2
26. P2O5
27. BaCl2
28. K2SO4
29. Pb(ClO3)2
30. H3PO4
Answer:
21 is ionic aicid only one 1 know
A cylinder at left with balls evenly spaced throughout the cylinder with an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.
Which change of state is shown in the model?
condensation
deposition
boiling
freezing
Answer:
deposition
Explanation:
Answer:
B
Explanation:
HELP PLS , CHEMISTRY
Answer:
N2H4
Explanation:
Find the mass of the empirical formula, which is 16.03 Take the formula mass and divide it by the empirical mass. This should give you an answer of 2 (well, 1.99 but it is close enough to a whole number to where you can just use 2). Multiply the subscripts of NH2. N has a subscript of 1, so now it will have a subscript of 2. H has a subscript of 2, so it will now have a subscript of 4. Therefore, your answer is N2H4.Plants use a process called photosynthesis to survive. What
evidence proves this process is a chemical change?
A. They turn green and change space
B. They get taller and change size
C. Water is needed
Glucose is created in the chloroplasts
Answer:
D
Explanation:
Glucose is produced through a process powered by sunlight that consumes Carbon Dioxide and produces oxygen as a waste product. In order for glucose to be produced, Carbon dioxide (a compound) must be, in essence, converted into a completely different chemical: dioxygen.
Photosynthesis is biochemical process by which green plants produce energy and release oxygen. Glucose is produced in this reaction and thus it is a chemical change. Thus, option D is correct.
What is a chemical change?The change in a substance if involves any bond making or bond breaking then it is called a chemical change. Whereas, if the substance just changes from one phase or state to the other it is called a physical change.
All chemical reactions are chemical changes involving bond making or breaking or both. Photosynthesis is a biochemical reaction takes place in plant leaves with the aid of light energy.
Photosynthesis involves several stages where an electron transport chain, various oxidising and reducing agents are performing significant roles.
The net reaction in photosynthesis is the combination of water and carbon monoxide to form molecular oxygen and glucose. Therefore, there occurs bond making and breaking. Thus option D is correct.
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POSS
Explain when gold is considered an element and when it is considered a solution.
Answer:
Gold is an element even when it is in a solution
When a lithium atom becomes ionized its new electron configuration is 4 points
the same as which element?
A. Ar
B. Mg
C. He
D. Fe
Answer:
C. He
Explanation:
When lithium is ionized, its new electronic configuration is the same as that of a helium atom.
Lithium is made up of 3 electrons with a configuration of:
2, 1
it has 1 electron in its outermost shell.
As a metal lithium will prefer to lose an electron due to its electropositivity.
On losing an electron, it will have 2 electrons remaining
Now, Helium has 2 electrons and this makes it similar to Lithium that has lost one electron.
This makes Lithium isoelectronic with Helium.
Which compounds are organic?
Answer:
NaCI
Explanation:
How many atoms of oxygen are in a molecule of glucose
(C6H12O6)
Answer:
6 oxygen atoms
Explanation:
How many grams of sugar must be dissolved in 150 ML of water to make a solution that has a concern traction of .6 g/ml
Hey there!:
Density = 0.6 g/mL
Volume = 150 mL
Mass = ?
therefore:
D = m / V
0.6 = m / 150
m = 0.6 x 150
m = 90.0 g of sugar
Hope this helps!
Which of the following is a substance?
A. air
B. alloy
C. soil
D. seawater
E. carbon
Answer:
D
Explanation:
hope this helps
Which of the following molecules is not an exception of octet rule? *
(a) BF₃
(b) PF₅
(c) CO₂
(d) IF₇
6. Calculate the mass of an object that has a density of 19.3 g/mL and a volume of 100. mL. (Show Your Work)
7. Calculate the volume of an object that has a density of 7.8 g/mL and a mass of 500. G. (Show Your Work)
Answer:
6. mass=1930g
7.64.10ml
Explanation:
6. mass=density time volume
7.volume=mass divide by density
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How do you find the mass in grams of one formula unit of a compound given all the atomic masses of every element in the compound?
Answer:
Explanation:
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)
Answer:
The characteristic molar mass of an element is simply the atomic mass in g/mol. However, molar mass can also be calculated by multiplying the atomic mass in amu by the molar mass constant (1 g/mol). To calculate the molar mass of a compound with multiple atoms, sum all the atomic mass of the constituent atoms.
Explanation:
What is characteristic of an ionic bond?
A snail takes 36 minutes to cross a highway. How many minutes would it take the snail to cross the same highway 7 times?
Answer:
252
Explanation:
7(36) = 252
How many grams of sodium bicarbonate are in 1.8 x 1023 formula units?NaHCO3
anyone faaaaast please:(((((((((
Answer:
Mass = 25.2 g
Explanation:
Given data:
Number of formula units of NaHCO₃ = 1.8×10²³
Mass in gram = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ formula unit
1.8×10²³formula unit × 1mol / 6.022 × 10²³ formula unit
0.3 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.3 mol × 84 g/mol
Mass = 25.2 g
A 10.3 L cylinder contains 10.67 moles of Cl2 at 21.2 C. What is the pressure (atm)
Answer:
Explanation:
we know that ideal gas equation is
PV=nRT
P=nRT/V
V=10.3L
n=10.67
T=21.2+273=294
R=0.0821
P=10.67*0.0821*294/10.3
P=25.00atm
Answer:
P = 25.0 atm
Explanation:
Given data:
Volume of gas = 10.3 L
Number of moles of Cl₂ = 10.67 mol
Temperature = 21.2 °C
Pressure of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
21.2+273 = 294.2 K
10.3 L × P = 10.67 mol × 0.0821 atm.L/ mol.K × 294.2 K
P = 257.72 atm.L / 10.3 L
P = 25.0 atm
Find the mass of AlCl3 that is produced when 3.58 moles of Al2O3 react with excess HCl according to the following equation.
Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)
Moles of Al2O3, m = 3.58 moles.
We need to find the mass of AlCl3 produced.
Solution :
1 mole of Al2O3 produce 2 moles of AlCl3.
So, 3.58 moles of AlCl3 produce 7.16 moles of AlCl3.
Mass of AlCl3 produced is :
m = moles × molecular mass of AlCl3
m = 7.16 × 133.34 g
m = 954.714 g
Therefore, mass of AlCl3 produced is 954.714 g.
Hence, this is the required solution.
Which reason explains why gas bubbles are released when a carbonated beverage is opened?
How many atoms of oxygen (O) are represented in the chemical formula shown below?
2 CO2
4 atoms of oxygen
O 2 atoms of oxygen
1 atom of oxygen
6 atoms of oxygen
Answer:
4 atoms of oxygen
Explanation:
what deterilnines whether or not an atom is boron
Answer:
Has 5 protons and the atomic number is 5.
Explanation:
The atomic number is equal to the number of protons and every element has a different number of protons. Therefore, finding how many protons there are and comparing to atomic numbers (or vice versa) would allow you to find if the atom is boron.
Using just the valence electrons on each atom determine which 2 atoms should be in the same group?
atoms 1 and 2
atoms 3 and 4
atoms 2 and 3
O atoms 1 and 4
Answer:
Explanation:
Atom 1 and 4 because they have the same number of valence elctrons in its outermost shell
SHOW ALL WORK! Partial
How many words can Jamie type in 2 days if she can type 62 words per minute?
1 day = 1440 minutes
2 days = 2880 minutes
2 days = 62 words per minute× 2880 minutes
2 days = 178560 words
Therefore she can type 178560 words in 2 days if she can type at 62 words per minutes