Answers
Answer: Element 1
Explanation:
If an element has 3 valence shells, then it must be in the third column so element 1 is the right answer. Hope this helps! :)
Related Questions
this was wrong!! plz answer asap! i cant get this wrong :/
Answers
Please answer, please answer please answer please answer
my last 2 chemistry question.
Answers
Answer:
1. filtration and evaporation
2. i) water is added to the sand and salt mixture
ii) then the mixture is filtrated and so the sand and the salt water was seperated
iii) the salt water is heated with the help of burner until the water gets evaporated
iv) after the water gets evaporated, the salt is remained in the container
3. observation:
on adding water to the mixture, the salt is completely dissolved in the waterwhen filtrated the sand is seperated from the salt waternow the salt water when heated with the burner until the evaporation, the water is evaporatedthe salt is precipitated and remained in the container4. cautions:
while using the burner, we should be cautious with firethe container that is heated should be holded with the help of a cloth to avoid heatcalculate the number of moles of nitrogen gas present in 400cm3 sample of it a pressure of 790 mmHg and 27°C.
Answers
Answer:
0.02 mol
Explanation:
Given data:
Number of moles of nitrogen = ?
Volume of sample = 400 cm³
Pressure = 790 mmHg
Temperature = 27°C
Solution:
Volume of sample = 400 cm³ (400/1000=0.4 L)
Pressure = 790 mmHg (790/760 = 1.04 atm)
Temperature = 27°C (27+273=300 K)
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
1.04 atm ×0.4 L = n× 0.0821 atm.L/ mol.K ×300 K
0.416 atm.L = n× 24.63 atm.L/ mol
n = 0.416 atm.L /24.63 atm.L/ mol
n = 0.02 mol
This diagram shows a ball rolling from left to right along a frictionless surface. In which sections will the ball be subjected to a balanced force?
A. Sections 2 and 5
B. Sections 2 and 3
C. Sections 1 and 4
D. Sections 2, 3, and 5
Answers
In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.
What is the frictionless surface?A Frictionless surface refers to that kind of surface where the force acting on any object which makes it difficult for the object to slide is almost zero or negligible, i.e., no resistance between surface or substance allowing the object to slide and move freely without any friction.
In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.
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Answer:1 and
Explanation:
Hii please answer this really easy x
Answers
Answer:
What do we need to find in that question ?
Answer:
1) no
2)yes
3)no
4)yes
Explanation:
hope that it helped you
Use the Periodic Table to find molar mass of water. Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water according to the equation: NaOH + HCl → NaCl + H2O What mass of water forms when 2.75 × 10–4 mol NaOH reacts completely? 2.75 × 10–4 mol NaOH = g H2O
Answers
Answer:
0.00496
Explanation:
Answer on EDG 2020
Answer:
the answer is 0.00496
Explanation:
2.75 x 10-4 mol NaOH = 0.00496 g H20
the second part is A.
FOR EDG 2020
Z forms chloride compounds with the formulae ZCl2 and ZC13.
ZCl2 is a pale green solid and ZC13 is a brown solid.
Based on the given information, which are true about element Z?
I Element Z has high melting point.
II Element Z can form complex ion.
III Element Z has more than one oxidation number.
IV Element Z is a metalloid.
A I, III
B II, IV
C I, II, III
D I, II, III, IV
Answers
Answer:
(B) II, IV.
hope this answer is helpful for u.
What happens to the luminosity of stars in the main sequence as temperature decreases
Answers
PLEASE HELP WITH THIS ASAP
Answers
microwaves
infrared
ultraviolet
X-rays
gamma-rays
a 30-n net force on a skater produces an acceleration of 0.6 m/s2. what is the mass of the skater
Answers
Answer:
The answer is 50 kgExplanation:
The mass of the skater can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{30}{0.6} \\ [/tex]
We have the final answer as
50 kgHope this helps you
In a solution, the substance into which other substances dissolve is called the ?
Answers
Answer:
Solvent
Explanation:
The solute is the substance that is being dissolved, while the solvent is the dissolving medium.
Why can't anything cheer me up rn?...
:'(
Answers
not sure.. you should eat poptarts
Answer:
well if u need some one i'm here
Explanation:
...
What is a solution?
Answers
Answer
there are to answers one is an answer to a problem or a mixture of chemicals
Explanation:
Answer:
a liquid mixture in which the solute is uniformly distributed within the solvent.
Explanation:
10. Haley the hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
What is her speed?
Answers
Answer:
4
Explanation:
Speed=Distance/time, so 20/5 divide time divided by distance. so the answer is 4.
The speed of Haley the hummingbird is 4 m/s.
From the question,
We are to calculate the speed of Haley the hummingbird
Speed is given by the formula
[tex]Speed =\frac{Distance\ traveled}{Time\ taken}[/tex]
From the given information,
The hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
That is,
The bird can cover a distance of 20 meters in 5 seconds.
Therefore,
Speed of the hummingbird = [tex]\frac{20}{5}[/tex]
Speed of the hummingbird = 4 m/s
Hence, the speed of Haley the hummingbird is 4 m/s.
Learn more on calculating speed here: https://brainly.com/question/1499535
A change in temperature causes a change in density. \
True False
Answers
Answer:
it will be true
Explanation:
I'll give 40 pts for this one but pls help me....
What is the new volume when the pressure of 20 milliliters of an ideal gas decreases from 202 kPA to 101 kPA?
Answers
Determine the frequency of light with a wavelength of 4.50 x 10-7 m.
Answers
Answer:
f = 0.67×10¹⁵ s⁻¹
Explanation:
Given data:
Frequency of light = ?
Wavelength = 4.50 ×10⁻⁷ m
Solution:
Formula:
Speed of light = wavelength × frequency
Speed of light = 3×10⁸ m/s
Now we will put the values in formula.
3×10⁸ m/s = 4.50 ×10⁻⁷ m × f
f = 3×10⁸ m/s / 4.50 ×10⁻⁷ m
f = 0.67×10¹⁵ s⁻¹
The _____ variable is the change you are observing and that changes in response to the _____ variable.
Answers
Answer:
Independent variable, dependent variable
Explanation:
Answer:
Dependent variable, independent variable
Explanation:
The dependent variable DEPENDS on the independent variable.
The energy required to remove an electron from a neutral atom is known as its:
Answers
Answer:
Ionization energy
Explanation:
How many grams of Phosphorus is required to complete combustion of 40g Oxygen P+O2-mm>P2O5 . Please balance
Answers
Answer:
Mass = 31 g
Explanation:
Given data:
Mass of phosphorus required = ?
Mass of oxygen = 40 g
Solution:
Chemical equation:
4P + 5O₂ → 2P₂O₅
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 40 g/ 32 g/mol
Number of moles = 1.25 mol
Now we will compare the moles of P and oxygen.
O₂ : P
5 : 4
1.25 : 4/5×1.25 = 1
Mass of phosphorus:
Mass = number of moles × molar mass
Mass = 1 mol × 31 g/mol
Mass = 31 g
Which is Chemical Equation is Balanced?
CH, +0,------CO,+2H2O
4A1+30,-----2A1,0,
H2+O2-----2H,0
Answers
Which part of the electromagnetic spectrum has a lower frequency than visible light?
gamma rays
x-rays
infrared
ultraviolet
Answers
Answer:
Infrared Radiation
Explanation:
Infrared Radiation
The range of infrared frequencies extends up to the lower limit of visible light, just below red.
The answer is infrared.
Which statement BEST explains whether or not matter is conserved in this chemical reaction? A Matter is being conserved because there is an equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. B Matter is not being conserved because there are more atoms of oxygen in the reactants than there are in the products, so there is also more mass in the reactants than there is in the products. C Matter is being conserved because carbon, hydrogen, and oxygen are found in the reactants and in the products in different arrangements, and the mass of the reactants is equal to the mass of the products. D Matter is not being conserved because there are 11 units in the reactants, one C8H8 and 10 O2, and 12 units in the products, eight CO2 and four H2O, so there is also more mass in the products that in the reactants.
Answers
Answer:
D
Explanation:
The matter is being conserved because the equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. Therefore, option (A) is correct.
What is the law of conservation of matter?One or more initial substances change into different substances in any chemical change. Both the initial and final substances are made up of atoms as all matter is made up of atoms.
According to the law of conservation of matter, matter can neither be created nor destroyed, we just can convert it from one form to another. So the same number and kind of atoms before and after the chemical change are present.
According to this law, the total mass of the reactants in a chemical reaction must be equal to the total mass of products for a low-energy thermodynamic process.
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How many possible values are there for the quantity "c", considering a specific chemical reaction represented by the equation aA+bB--> cC +dD, in this equation the letters A,B,C and D represent chemicals, and the letters a,b,c and d represent confessions in the balanced equation.
Answers
Answer:
There is only one possible value for the quantity "c"
Explanation:
There is only one possible value for the quantity "c". This is because the a,b,c and d represent number of moles in he balanced equation. And since the number of moles of a particular substance (atom or compound) in a balanced equation must be distinct, it (the substance) can only have one value. For example, consider the equation below
2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O
It can be seen from the above equation that the individual number of moles are distinct and have just one possible value. And if C₂H₂ is A, O₂ is B, CO₂ is C and H₂O is D, then 4 is "c".
Thus, "c" is the number of moles for the substance "C" with just one possible value.
GIVING BRAINLIST IF YOU GET THE ANSWER RIGHT Particles in a warmer block will have ________ kinetic energy and move ______than the particles in the colder block.
Question 10 options:
more/faster
less/slower
less/faster
more/slower
Answers
Answer:
less/ faster
Explanation:
During witch process dose carbon dioxde gas move from the atmosphere
Answers
Answer: it is density
Explanation:
What quantity is measured in g/dm^3
Answers
Answer:
Molar concentration is measured in g/dm³
hope this helps x
How many unpaired electrons are present in the ground state of the atoms in Group 4A(14)?
unpaired electrons
Answers
Answer:
the correct answer is 2
Explanation:
i just did this assignment :)
There will be 2 unpaired electrons in p orbital of unpaired electrons present in the ground state of the atoms in Group 4A(14).
What are unpaired electrons?The unpaired electrons are those which do not have any pair due to absence of no more electrons and they are highly unstable elements if the electrons are not paired in the orbitals.
There are 4 types of orbitals s, p, d, and f s-orbital consist of one pair of electrons to fill and the p-orbital have 3 blocks which can be filled with 3 pair that is 6 electrons after filling, and two unpaired electrons left in p-orbital.
Therefore, in the ground state of the atoms in Group 4A(14) 2 unpaired electrons in the p orbital of unpaired electrons are present.
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Evidence for past events in Earth's ancient history are provided by:
a
time lines
b
history books
c
the biodiversity of North America
d
rocks and the fossils within them
Answers
PERIODIC TABLE LOVERS HELP ME WITH THIS AND ILL PUT U ON BRAINLIEST !
Answers
Answer:
an educated guess of f and i
Explanation: