Answer:
A
Explanation:
Conductors allow for charge transfer through the free movement of electrons. In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule. ... The insulator serves as a handle for moving the conductor around on top of a lab table
Answer:
1. Electrons surrounding a nucleus are attracted to the protons within it because electrons and protons have opposite charges. Electrons closest to the nucleus are attracted with such a force that they can’t escape from the atom. These electrons tend to shield the protons from electrons that are farther away because electrons have the same charge and repel each other. Electrons that are farther away have less attraction to the protons within the nucleus and are more likely to be detached from the atom.
2. Electrons can be transferred from atoms of one body to atoms of another body through friction. This can occur when one body is rubbed against another or when a liquid flows across a solid. In either case, one body may be given a positive charge while the other body is given a negative charge of the same magnitude. Both charges are developed at the same time. Electrons can also be transferred from one body to another when a charged body comes into contact with an uncharged body. The electrons move in the direction that will equalize the charges; thus, the uncharged body will be given the same charge as the charged body.
3. Free electrons move from points of negative charge to points of positive charge. When these electrons move freely from one point to another with little resistance, the material they’re traveling through is said to be a conductor. Conductors have a large number of free electrons. Insulators, on the other hand, have very few free electrons and offer great resistance to the movement of these electrons. Electric charges produced on one end of a body composed of insulating materials will most likely not spread throughout the body. In a conductor, this charge would spread throughout the entire body. Metals are generally conductors; oils, rubber, air, porcelain, and plastics are good insulators.
4. Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:
One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.
A positively charged cloud comes near a negatively charged cloud.
A cloud with either a positive charge or a negative charge comes near the earth.
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
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
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
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
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.
To find more about photosynthesis, refer the link below:
https://brainly.com/question/1757345
#SPJ2
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.
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.
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:
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
CO, + H2O –H^2 CO^3 The reaction is which type of chemical reaction?
Answer:
Combination reaction or synthesis reaction
Explanation:
Given reaction:
CO + H₂O → H₂CO₃
The type of reaction shown above is a combination or synthesis reaction. A combination reaction is one in which a single product is formed from two or more reactants.
In the given reaction carbon monoxide combines with water to produce hydrogen carbonate.
The formation of compounds from the union of their constituent elements falls into this category of reactions.
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
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.
Hope it helps :)
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:
hope this help
brainliest please!!!!
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.
pleasee helpppp
i have posted this many times m=but no one has helped :(
will mark brainliest!! :)
Answer:
its 1 transferd electrons 2 shared electrons 3 metal only
Explanation:
Answer:
1 transferd electrons 2 shared electrons 3 metal only
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.what trends can you see in the melting point and the boiling point of the halogens?
Answer:
The boiling points increase down the group.
Explanation:
The melting and boiling points increase down the group because of the van der Waals forces. The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.
Answer:
Melting and Boiling Points (increases down the group)
The melting and boiling points increase down the group because of the van der Waals forces. The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.
Explanation:
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
Which reason explains why gas bubbles are released when a carbonated beverage is opened?
50 Points! Will Mark Brainliest!
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 the formula Trisilicon tetra nitride
How can you tell the difference between a balanced equation or unbalanced equation?
Answer:
By counting the number of atomic number
How many atoms of oxygen are in a molecule of glucose
(C6H12O6)
Answer:
6 oxygen atoms
Explanation:
28. Which statement is INCORRECT regarding radiation?
a. Thicker materials offer better shielding against radiation
b. Gamma radiation is the only type that can cause health effects
c. Traveling further away from a source of radiation reduces your exposure
d. Each type of radiation can be detected by a device called a Geiger counter
Answer:
Radiation is energy. It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines. Radiation travels from its source in the form of energy waves or energized particles. There are different forms of radiation and they have different properties and effects.
Related information in Spanish (Información relacionada en español)
On this page:
Ionizing and non-ionizing radiation
Electromagnetic spectrum
Types of ionizing radiation
Periodic Table
Non-Ionizing and Ionizing Radiation
There are two kinds of radiation: non-ionizing radiation and ionizing radiation.
Non-ionizing radiation has enough energy to move atoms in a molecule around or cause them to vibrate, but not enough to remove electrons from atoms. Examples of this kind of radiation are radio waves, visible light and microwaves.
Ionizing radiation has so much energy it can knock electrons out of atoms, a process known as ionization. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes. Ionizing radiation comes from x-ray machines, cosmic particles from outer space and radioactive elements. Radioactive elements emit ionizing radiation as their atoms undergo radioactive decay.
Radioactive decay is the emission of energy in the form of ionizing radiationHelpionizing radiationRadiation with so much energy it can knock electrons out of atoms. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes.. The ionizing radiation that is emitted can include alpha particles, beta particles and/or gamma raysHelpgamma raysA form of ionizing radiation that is made up of weightless packets of energy called photons. Gamma rays can pass completely through the human body; as they pass through, they can cause damage to tissue and DNA.. Radioactive decay occurs in unstable atoms called radionuclides.
Explanation:
Name one star from the diagram that is fusing hydrogen into helium
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:
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!
can Fossil Fuels harm?
Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health. Sulfur dioxide (SO2) emissions, primarily the result of burning coal, contribute to acid rain and the formation of harmful particulate matter.
Answer:
No
Explanation:
Because they helps us to make oil and is not harmful to us
Which of the following is a substance?
A. air
B. alloy
C. soil
D. seawater
E. carbon
Answer:
D
Explanation:
hope this helps