Answer:
In Non-metals
Period - reactivity increases as you go from the left to the right. Group - reactivity decreases as you go down the group.
Explanation:
When an object transfers energy to another object, does it always transfer all of it’s energy?
Answer:
Conservation of energy means that the total change of energy in any system is always equal to the total energy transferred into or out of the system.
Answer:
Conservation of energy means that the total change of energy in any system is always equal to the total energy transferred into or out of the system.
Explanation:
Radar works by sending out electromagnetic energy at a particular wavelength and receiving a reflected signal from distant objects, similar to a sound echo. Many modern military aircraft have what is known as “stealth technology” that allows the aircraft to be invisible to enemy radar. What statement best explains how this is possible?
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of options. However, stealth technology works (in two major ways) by using coating materials other than the normal coating materials or by changing the shape of the aircraft.
Normally, the coating material of the aircraft are always produced in a way that they can be able to reflect antenna signals back to radar antenna. However, with stealth technology, other coating materials have been developed that absorbs the radar energy instead of reflecting it. Also, conventional aircrafts have a rounded shape which makes the body easily reflect some radar signals back to the radar antenna but stealth aircrafts have a flat surfaces and pointed edges instead; this enables the aircraft to reflect radar signals away from the radar antenna.
What do the valence of electrons tell you?
Answer:
valence electrons are the electrons that are located in the outermost electron shell of an element. Knowing how to find the number of valence electrons in a particular atom is an important skill for chemists because this information determines the kinds of chemical bonds that it can form and, therefore, the element's reactivity
Explanation:
When is International Day of Forests?
Answer:
21 March
Explanation:
hope its helpful
Chemistry, biology and geography are the branch of natural science.
Select one:
True
False
Answer:
the answer is (a)true.
Answer (s) true.
Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.
PLEASE HELP WITH THESE THREE (30 POINTS)
1) How is the number of neutrons in the nucleus of an atom calculated?
A. Add the number of elections- and protons+ together
B. Subtract the number of elections- from protons+
C. Subtract the number of protons+ from the atomic mass number
D. Add the atomic mass number to the number of elections-
2) Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same group on the periodic table. Why? *
A. They have the same size.
B. They react with each other.
C. They have similar properties.
D. They have the same number of protons
3) Which of the following elements would be a transition metal?
A. Ca
B. Au
C. Rb
D. Fr
Seismographs are instruments used to ____________.
Question 9 options:
Record the location of the focus
Record size of the break in the Earth’s crust at the epicenter
Record the motion of the ground during an earthquake.
Record topography of the crust in the earthquake zone
Answer:
they are used to record the motion of the ground
Explanation:
A neutral atom has an atomic number of 20 and an alum
does the atom have?
Explanation:
Atomic number of the atom is 20 in neutral state.
The atomic number is the number of protons in the atom. Protons are positively charged particles in an atom. So, the atom has a proton number of 20 Also, for a neutral atom, the number of protons is equal number of electrons. Number of electrons in the atom is 20What is a closed water cycle?
Answer:
The global hydrological cycle is powered by solar energy. It is a closed system, in continual circulation. This means that there is a definite amount of water in the system and that this amount does not change. 99 per cent of the water is stored within the cycle, leaving only 1 per cent in circulation.
Explanation:
Which is an example of a solution A) air B) oxygen C) salt D) water
Answer:
the answer is A air
Explanation:
Because thats an example of a solution
so deku should have more than one quirk because one for all has the power to pass down the user quirk but we all know that all might was quirkless so deku should have 6 quirks to unlock besides one for all he already has black wip and if he was actually had a quirk as a kid he could get it back with the the help of eri thank you if you made it this far TwT heres a potato
Answer:
i never thought about it that way
Explanation:
your right
How does atomic emission spectra relate to color?
Answer:
Electrons in the gaseous atoms first become excited, and then fall back to lower energy levels, emitting light of a distinctive color in the process. ... An atomic emission spectrum is the pattern of lines formed when light passes through a prism to separate it into the different frequencies of light it contains.
Explanation:
hope this helps u.
evaluate these two sound waves and determine what property they have In common
Answer:
The same wavelength
Explanation:
The two sound waves shown in the diagram has the same wavelength as clearly shown.
Wavelength of a wave is the distance between a complete wave cycle. It is the difference between successive train of troughs and crests. In the figure shown the amplitude, vertical displacement of the wave differs. But the wavelength of the waves are the same.lavoviser is commonly know as the( brainly dont eveer help)
Answer:Lavoisier is known as the “Father of Modern Chemistry” or the “Father of Chemistry”.
Explanation:
Describe the location of a proton within an atom. Compare the mass of a proton in regard to other subatomic
particles.
Need help ASAP please
Explanation:
Protons are the positively charged particles found in an atom.
A proton is found within the nucleus of an atom. Together with the neutron, they make up the nuclear region of an atom.Protons and neutrons constitutes the bulk mass of the atom.
The mass of a proton is 1.67 x 10⁻²⁷kg
The proton have the same mass as neutrons.
Compared to electrons, it is 1840 times the mass of an electron.
The nucleus of an atom is where a proton is found. The majority of an atom's mass is located in its nucleus, which is the central part of the atom and is made up of protons and neutrons.
Positively charged protons are what give an element its atomic number and chemical structure. A cloud of negatively charged electrons that are located in particular energy levels or orbits surround the nucleus. In terms of mass, a proton is much heavier than an electron. The mass of a proton is about 1,836 times that of an electron, or 1.67 x 1027 kg.
However, protons have the same mass as neutrons, another subatomic particle present in the nucleus. Protons and neutrons have the same mass, neutrons are slightly heavier.
Learn more about protons, here:
https://brainly.com/question/12535409
#SPJ6
Need help with the question.
Answer:
Explanation:
Abundance means: a very large quantity of something. but in chemistry the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million.
I don't think the abutencies have an effect because I can't find anything.
Hope this helps :D
In which 2 states of matter can a substance take the shape of its container?
Select one:
solid and gas
solid and liquid
gas and crystal
liquid and gas
Explain why these are the products based on trends in the periodic table (the number of
valence electrons, electronegativity, etc.) for:
CH4 + O2 ------------> CO2 + H2O
Answer:
As more potassium sulfate dissolves in the water, the mixture becomes
Explanation:
As more potassium sulfate dissolves in the water, the mixture becomes
Compounds Lab Report
Instructions: In this virtual lab you will build chemical compounds from known elements. Record your hypothesis and compound results in the lab report below. You will submit your completed report to your instructor.
Note: If you cannot complete this lab as directed, please contact your instructor for assistance.
Name and Title:
Include your name, instructor's name, date, and name of lab.
Objectives(s):
In your own words, what is the purpose of this lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the composition of each of your compounds below. Be sure to include the number of atoms for each element. An example has been supplied for you.
Compound Name Chemical Formula Sodium (Na) Atoms Calcium (Ca) Atoms Hydrogen (H) Atoms Oxygen (O) Atoms Carbon (C) Atoms Chlorine (Cl) Atoms
Ex: Sodium
hypochlorite NaClO 1 0 0 1 0 1
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
Using two to three sentences, summarize what you investigated and observed in this lab.
Why do you believe knowing how elements and compounds react together is essential in everyday matters?
Some elements are more "reactive" than other elements; why do you think this is?
Choose one of the compounds from the table and explain how you know the numbers of atoms in your formula.
Is it possible for two different compounds to be made from the exact same two elements? Why or why not? With a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?
Name and Title:
Colleen DeBruin, Hillary Mulkavits, 11/18/2020, compounds lab.
Objectives(s):
to build chemical compounds from known elements
Hypothesis:
if I use oxygen hydrogen and carbon then I can make five new compounds in four minutes
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the composition of each of your compounds below. Be sure to include the number of atoms for each element. An example has been supplied for you.
Compound Name Chemical Formula Sodium (Na) Atoms Calcium (Ca) Atoms Hydrogen (H) Atoms Oxygen (O) Atoms Carbon (C) Atoms Chlorine (Cl) Atoms
Ex: Sodium
hypochlorite NaClO 1 0 0 1 0 1
Water H20 o 0 1 2 0 0
Glucose C6H12O6 0 0 12 6 6 0
Formic/methanoic acid HCOOH 0 0 2 2 1 0
Butanoic Acid C3H7COOH 0 0 8 2 4 0
Carbon Dioxide C02 0 0 0 2 1 0
Carbon Monoxide CO 0 0 0 1 1 0
Fructose C6H12O6 0 0 12 6 6 0
0 0 0
0 0 0
0 0 0
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
I found as many combinations of carbon hydrogen and oxygen as possible
If there is a job that combines elements you would be doing that every day making it an every day matter
elements are like people, they are all different causing them to react differently and be more reactive
H20 has four because there are 2 oxygen and one hydrogen because of the numbers in the name of the compound
Yes because two elements can form two different types of bonds causing different outcomes
If this isn't right I'm sorry but I had it as an assignment so we will get it wrong together lol
why is group 8 not called group 8?
Answer:
Why is it called Group 8? In the rest of the periodic table, the number of the group is the same as the number of outer shell electrons in the atoms of that group. This is not true for the noble gases. Helium only has 2 electrons in its outer shell, while the others all have 8.
every element has 8 electron in outer shell but not in helium because it has 2 electrons
Australia's winter solstice starts in June 21st. What season will begin in
North America at that same time?
Answer:
summer will start in North America June 21st
Given the reaction: 4NH3 + 502 → 4NO + 6H2O
What is the total number of moles of NO produced when 1.0 mole of O2 is completely consumed?
Answer: Hello there! the answer is 3.
Explanation:
When you put it into a table and separate the variables, you'll get 0.80 molecules.
Answer:
3
Explanation:
trust
please someone help !!!!
Answer:
mass, space, composition, changes, 5, carbon, carbon, organisms, analytical chemistry, physical chemistry, energy transfer, two
Explanation:
You dissolve 150.0 grams of a mixture of MgCl₂ and KCl in water, add a solution of excess AgNO₃, and precipitate all of the chloride ion as AgCl. After filtration and drying, you find that you have formed 329.0 grams of AgCl. What is the mass in grams of KCl that was in the original 150.0 grams of mixture?
Answer:
112.6g KCl
Explanation:
With the mass of AgCl that we obtain after the precipitation we can obtain its moles = Moles Cl. As all Cl comes from KCl, moles of Cl = Moles KCl + 2*Moles MgCl₂. We can write:
Moles AgCl = Moles Cl
329.0g * (1mol / 143.32g) =
2.2956 moles Cl = Moles KCl + 2 Moles MgCl₂ (1)
150.0g = MolesKCl * 74.5513g/mol + Moles MgCl₂*95.211g/mol (2)
Replacing (2) in (1):
2.2956 moles Cl = 150/74.5513 - 95.211/74.5513 Moles MgCl₂ + 2 Moles MgCl₂
2.2956 = 2.012 - 1.2771Moles MgCl₂ + 2moles MgCl₂
0.2836 = 0.7229 moles MgCl₂
0.392= moles MgCl₂
Mass MgCl₂:
0.392 * (95.211g/mol) = 37.4g MgCl₂
Mass KCl:
KCl = 150.0g - 37.4g =
112.6g KClWILL GIVE LOTS OF POOIINNTTSSS PLEEAASSEE IMMM CRYINNNNNN PLEASE STOP JUST SITTIN THERE AND LOOKIN AT ITTT ANSWEERRR ASAPPPP
Explain specific heat in your OWN words. (2pts) Explain the equation. (1pt) Give an example of your understanding of the concept that we encounter on a daily basis. (3 pts.)
All the heat needed to raise the temp of something at a given degree.
Q=mc△T
Q= heat energy
m= mass
c= specific heat capacity
△T= change in temperature
what refers to how large ro strong is the force
Answer:
Magnitude determines the size and how strong force is.
Which statements best describe body cells and sex cells? Check all that apply.
Body cells are diploid.
Sex cells are haploid.
Body cells have half the number of chromosomes as sex cells.
Sex cells do not have pairs of chromosomes.
Sex cells are formed during mitosis.
Most cells in humans are body cells.
1 : Body cells are diplod
2 : Sex cells are halplod
3 : Sex cells are formed during chromosomes
4 : Most cells in humans are body cells
Answer:
A- Body cells are diploid.
B- Sex cells are haploid.
D- Sex cells do not have pairs of chromosomes.
F- Most cells in humans are body cells.
Explanation:
Body cells are diploid while sex cells are haploid.
The body generally have two kinds of cells which are;
Gamete cellsBody cellsGenerally, the body cells are more in number than the gamete or sex cells. These gamete cells are passed on from parents to offspring but body cells are not passed on to offspring.
The following statements are true about gamete cells and body cells;
Body cells are diploid. Sex cells are haploid.Sex cells do not have pairs of chromosomes.Most cells in humans are body cells.Learn more: https://brainly.com/question/2673886
Molecular mass of CH3 OH =
Answer:
32g/mol
Explanation:
When dealing with a compound, the molar mass is the gram - formula mass or gram moleclular weight. This is determined by the addition of its component atomic masses.
For CH₃OH;
Atomic mass of C = 12g/mol , H = 1g/mol, O = 16g/mol
So,
Molecular mass = 12 + 3(1) + 16 + 1 = 32g/mol
Two chemical companies can supply a raw material. The concentration of a particular element in this material is important. The mean concentration for both suppliers is the same, but you suspect that the variability in concentration may differ for the two companies. The standard deviation of concentration in a random sample of n1 = 10 batches produced by company 1 is s1 = 4.7 grams per liter, and for company 2, a random sample of n2 = 16 batches yields s2 = 5.8 grams per liter. Is there sufficient evidence to conclude that the two population variances differ? Use α = 0.05.
Answer:
No, there's no sufficient evidence to make a conclusion that the two population variances differ.
Explanation:
Given that:
For company 1
Sample size [tex]n_1[/tex] = 10
Standard deviation [tex]s_1[/tex] = 4.7
For company 2
Sample size [tex]n_2[/tex] = 16
Standard deviation [tex]s_2[/tex] = 5.8
The null hypothesis and the alternative hypothesis can be computed as:
[tex]\mathbf{H_o: \sigma^2_1 = \sigma^2_2}[/tex]
[tex]\mathbf{H_1: \sigma^2_1 \ne \sigma^2_2}[/tex]
Since the alternative hypothesis is ≠, it is then a two-tailed test
Using the F test formula to test for the equality of the variations, we have:
[tex]F = \dfrac{s_1^2}{s_2^2}[/tex]
[tex]F = \dfrac{4.7^2}{5.8^2}[/tex]
[tex]F = \dfrac{22.09}{33.64}[/tex]
F = 0.6567
Hence, the estimated F-value for comparing the standard deviation = 0.6567
The degree of freedom df = ([tex]n_1[/tex] - 1, [tex]n_2[/tex] - 1)
df = ( 10- 1, 16 - 1)
df = (9, 15)
The level of significance ∝ = 0.05
The critical value for a two-tailed test when ∝ = 0.05 and df = (9, 15)
[tex]F_{\alpha/2,n_1 -1,n_2-2} = F_{0.05/2, 9,15}[/tex]
[tex]= F_{0.025, 9,15}[/tex]
by using the Excel function = FINV (0.025,9,15)
= 3.123
Similarly;
[tex]F_{1-\alpha/2,n_1 -1,n_2-2} = F_{1-0.05/2, 9,15}[/tex]
[tex]= F_{0.975, 9,15}[/tex]
Using the Excel function = FINV(0.975,9,15)
= 0.265
Critical Region: To reject the null hypothesis if f ≥ 3.123 or If f ≤ 0.265.
But since The estimated value for F = 0.6567 which is greater than 0.265, we fail to reject the null hypothesis.
Thus, there's no sufficient evidence to make a conclusion that the two population variances differ.
Determine the total volume of a balloon if it is inflated with 2.50g helium at 180C and 0.87atm.
Answer:
V = 267.2 L
Explanation:
Given data:
Volume of balloon = ?
Mass of helium = 2.50 g
Temperature of gas = 180°C
Pressure = 0.87 atm
Solution:
Number of moles of helium:
Number of moles = mass/molar mass
Number of moles = 2.50 g/ 4 g/mol
Number of moles = 0.625 g
Volume of helium:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
0.87 atm× V = 0.625 mol × 0.0821 atm.L/mol.K×453 K
V = 232.45 atm.L /0.87 atm
V = 267.2 L
