Answer:
Group 16 Melting point 220.8°C, 429.4°F, 494 K
Period 4 Boiling point 685°C, 1265°F, 958 K
Explanation:
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
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.
An inflated balloon is left outside overnight. Initially, it has a volume of 38.7 L when the temperature is 255°C and the pressure is 9.4 atm. At what temperature (in °C) will the balloon have a volume of 65.9 L if the pressure falls to 4.2 atm?
what happens to the radius of the atoms of an element as you go down a column of the periodic table ?
Answer:
Increases
Explanation:
The atomic radius increases as you go down a periodic table. Across a period which is a row, the atomic radius reduces.
The atomic radius is taken as the half of the inter-nuclear distance between two covalently boned atoms of non-metallic elements. It is also, half of the distance between two nuclei in the solid state. Across a period in the periodic table, atomic radii decreases progressively from left to right. Down a group it increases from up down.When combined in the correct ratio hydrogen and oxygen atoms can form water as shown below
Answer:molecule of a compound
Explanation:
This woman is riding a bicycle down a hill at a constant speed and in a straight line. Which change will increase the speed of the bicycle?
A. An added force of 20 N down the hill
B. Added forces of 30 N up the hill and 30 N down the hill
C. Added forces of 30 N up the hill and 20 N down the hill
D. An added force of 20 N to the side of the hill
Answer:
The answer is A. An added force of 20 N to the side of the hill
Explanation:
Answer:Its A. An added force of 20 N down the hill, Not D. An added force of 20 N to the side of the hill. The first person meant A and meant to add force of 20 N down the hill.
Explanation:
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
La longitud de enlace del Bi—I experimental en el triyoduro de bismuto, BiI3, es 2.81 Å. De acuerdo con este valor y con los datos de la figura 7.7, prediga el radio atómico del Bi
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
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
please someone help !!!!
Answer:
mass, space, composition, changes, 5, carbon, carbon, organisms, analytical chemistry, physical chemistry, energy transfer, two
Explanation:
A ring made of pure gold contains 5.29 x 1022 atoms. How many moles are in the ring?
Answer:
0.088 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.29 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.087873...[/tex]
We have the final answer as
0.088 molesHope this helps you
What needs to happen for a chemical change to happen?
Explain the periodic trend for ionization energy and why this occurs?
Answer:
Ionization energy tends to increase across a period because the nuclear pull is increasing while shielding is not changing because electrons are in the same energy level. Not only that as we move across a period elements are closer to a full octet.
Explanation:
a remote control toy jet fighter has a mass of 5 kg and can travel up to 60 m/s. what is the kinetic energy of the toy jet fighter at this speed?
Answer:
9000J
Explanation:
Given parameters:
Mass of the jet fighter = 5kg
Velocity = 60m/s
Unknown:
Kinetic energy of the jet fighter = ?
Solution:
The kinetic energy of a body is the energy due to motion of the body.
It is mathematically expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
So;
K.E = [tex]\frac{1}{2}[/tex] x 5 x 60² = 9000J
When the equation
Cu + AgNO3 → Cu(NO3)2 + Ag
is balanced, the coefficient of copper (II) nitrate is
A. 0.
B. 3.
C. 1
An equation which follow the law of conservation of mass is called the balanced equation. The coefficient of copper (II) nitrate is 1 .The correct option is C.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation.
The coefficients are the numbers which are used to balance the chemical equation. They are added in front of the formulas. According to law of conservation of matter, mass can neither be formed nor be destroyed.
The balanced equation for the given reaction is:
Cu (s) + 2AgNO₃ (aq) → Cu (NO₃)₂ (aq) + 2Ag (s)
Here the coefficient of Cu (NO₃)₂ is 1. The number of 'Cu', 'Ag', 'N' and 'O' atoms are equal. So the given equation is balanced. The coefficient of AgNO₃ is 2, and 'Ag' is 2.
Thus the correct option is C.
To know more about balanced equation, visit;
https://brainly.com/question/29769009
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Please anyone help me
Answer:
It is c
Explanation:
Answer:
W and Z, because they are in the same group as one another
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
a sample of ammonia has a mass of 89.9g. how many molecules are in this sample?
Answer:3.90
Explanation:
Is the equation 2NO+02 NO, balanced? Explain your answer
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:
What is the difference between the groups (vertical columns) and periods (horizontal rows) on the periodic table?
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
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
what type of reaction is being produced for the formula C3H8
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:
Which of the following best describes a vacuum
Answer:
it sucks up stuff,cleans around the house,and can be emptied
Explanation:
because its what it is spose to do
Answer:
a space entirely devoid of matter.
Explanation:
Scientists digging in a cave found an unknown substance. The scientists
found that the substance’s molecules were moving around each other. The scientists
increased the speed of the substance’s molecules and caused a phase change. How
did the scientists do this, and how did this affect the substance?
Answer:
By adding heat energy
It changed to gas
Explanation:
A substance whose molecules are moving around each other is a liquid. They are held in shape by very weak intermolecular forces.
For solids, there is no movement because the molecules are held up in a fixed lattice.
Gases molecules moves randomly and independently of one another.
When a liquid is heated and it gains heat energy, it changes phase. A phase change to gas can be predicted. This is because there is an increase in the speed of the substances.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:
is drawing on paper a chemical or physical change
Answer:5
Explanation:
Answer:
physical change
Explanation:
What is the difference between random decay and theoretical?
Answer:
Spontaneous and random. Decay is called spontaneous because the occur on their own and are unaffected by external factors like temperature, pressure, and many more. Decay is called random because we cannot determine the rate at which it decays but can only determine the probability of the decay.Oct 21, 2015
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
Explain why Mercury has a shorter year then earth HURRY IM IN CLASS!!!!!!!!!!
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.
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.
