Just need help with these 2 problems

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.

Answer:

mass, space, composition, changes, 5, carbon, carbon, organisms, analytical chemistry, physical chemistry, energy transfer, two

Explanation:

Answer:

no its not balanced because we have 2 N in the reactants while we have 1 in the product same for 0 we have 2 0 in the reactants and 1 in the products

for it to be balanced it should be NO + O2 → NO2

Explanation:

Answer:

i never thought about it that way

Explanation:

your right

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 =

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

Answer:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods

Explanation:

Atomic number of the atom is 20 in neutral state.

Answer:

Explanation:

This small planet spins around slowly compared to Earth, so one day lasts a long time. Mercury takes 59 Earth days to make one full rotation. A year on Mercury goes by fast. Because it's the closest planet to the sun, it doesn't take very long to go all the way around.

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

Explanation:

Protons are the positively charged particles found in 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:

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Answer:

21 March

Explanation:

hope its helpful

Answer:

they are used to record the motion of the ground

Explanation:

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

Answer:molecule of a compound

Explanation:

Answer:

Magnitude determines the size and how strong force is.

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:

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.

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.

Answer:

1,42 Å

Explanation:

La longitud de enlace de Bi-I se obtiene por

Bi-I = Radio del átomo de Bi + Radio del átomo de yodo

pero radio del átomo de yodo = 1.39Å

Longitud del enlace Bi-I = 2,81 Å

Por lo tanto, el radio del átomo de Bi = 2,81 Å - 1,39 Å

radio del átomo de Bi = 1,42 Å

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;

Generally, 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;

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Answer:

The balanced chemical equation for the combustion of propane is: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).

Explanation:

Answer:

chemical reaction if that is answer

Explanation:

Answer:

It is c

Explanation:

Answer:

W and Z, because they are in the same group as one another

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

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:

Answer:

As more potassium sulfate dissolves in the water, the mixture becomes

Explanation:

As more potassium sulfate dissolves in the water, the mixture becomes

Answer:

the answer is A air

Explanation:

Because thats an example of a solution