Answer:
Shell number
Explanation:
By adding electrons to an uncharged object, the object *
becomes negatively charged
becomes positively charged
becomes energized
changes color
Answer:
becomes negatively charged
Explanation:
this is because when an object receives electrons it becomes negatively charged and the object that loses electrons becomes positively charged.
Answer:
First one because by adding more electrons it makes something more negative. So it becomes negatively charged
The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?
*Atomic radii decrease from left to right across a period and decrease from top to
bottom in a group.
*Atomic radii increase from left to right across a period and increase from top to
bottom in a group.
*Atomic radii decrease from left to right across a period and increase from top to
bottom in a group.
*Atomic radii increase from left to right across a period and decrease from top to
Wottom in a group.
Answer:
The answer is: Atomic radii decreases from left to right across a period and increases from top to bottom in a group.
Explanation:
A stretched out rubber band is an example of:
A. kinetic energy
B. potential energy
C. gravitational energy
D. light energy
If there are 5 protons, how many electrons does the atom have?
If there are 5 protons, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p.
What is proton ?The term proton is defined as a subatomic particle found in the nucleus of every atom. Its mass is slightly less than that of a neutron and 1,836 times the mass of an electron.
The protons are considered as elementary particles. The protons are called to be composite particles, containing three valence quarks, and together with neutrons are now classified as hadrons.
Boron has an atomic number of 5. In which it has 5 protons. Therefore, the atom also has 5 electrons. Its atomic mass is 10.811. Thus, it has 11 total particles in its nucleus i.e., protons and neutrons.
Thus,If there are 5 protons, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p.
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The Calories on a food label indicate the
amount of energy the food contains in
one serving. Which form of energy is
contained in food?
Answer:
chemical energy
Explanation:
Ethyl alcohols formula is C2H50H,what is this?
a.A element
b.A compound
c.A mixture
Explanation:
C2H5OH is ethanol, which is a compound.
pls help me with science
A sound with more vibrations per second sounds higher than a sound with fewer vibrations per second.
Lesson 4.07
Question 9 options:
True
False
Answer:
that is a false sentence
Answer:
I'm sure you've already finished the est but the real answer is true, I took the k12 test and got that one correct, hope this helps anyone!
Explanation:
5.Summarize Which of the following is not an
advantage of using SI units?
A allows scientists to compare observations
and results
B can compare measurements made years
apart
C based on the number 5, which is easy to use
in calculations
D uses prefixes to express measurements that
are small or large
Answer:
C based on the number 5, which is easy to use in calculations
Explanation:
The SI unit system is not based on the number 5.
Please help me answer this question.
Explanation:
Hydrochloric acid is HCl.
Hydrogen is H2.
Mole ratio is the numbers infront of them, which is 6 : 3.
Answer:Hydrochloric acid is HCl.
Hydrogen is H2.
Explanation:
En un vaso se han puesto 250 g de alcohol junto con 2 g de yodo, que se disuelven completamente. Calcular la concentración de la disolución en % en masa.
The translation of the question is
250 g of alcohol have been put in a glass together with 2 g of iodine, which dissolve completely. Calculate the concentration of the solution in% by mass?
Answer:
The %mass by mass of the given solution is 0.794%
Explanation:
We are given
Mass of solute(Iodine) = 2g
Mass of the solvent (Alcohol) = 250g
Since the Iodine dissolves completely in Alcohol
Total mass of the solution = 250 + 2 = 252g
the formula of concentration of the solution in % by Mass is given by
%[tex]\frac{w}{W} = \frac{Mass of the solute*100}{Total mass of the solution}[/tex]
%w/W = [tex]\frac{2*100}{252}[/tex]
= 0.794%
Therefore the %mass by mass of the given solution is 0.794%
Which one of the following statements about s orbitals is incorrect ?
Group of answer choices
Pleaseee help If you understand....
Answer:
def don't understand that sorry
Can someone answer this for me?
Answer: The moles of nitrogen dioxide produced are 96.3
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}=\frac{3714L}{22.4L}=165.8moles[/tex]
[tex]4NH_3(g)+7O_2(g)\rightarrow 4NO_2(g)+6H_2O(g)[/tex]
According to stoichiometry:
7 moles of oxygen [tex](O_2)[/tex] produce = 4 moles of nitrogen dioxide [tex](NO_2)[/tex]
Thus 168.5 moles of oxygen [tex](O_2)[/tex] will produce = [tex]\frac{4}{7}\times 168.5=96.3[/tex] moles of nitrogen dioxide [tex](NO_2)[/tex]
What would you see if you were standing on the Earth's surface in the penumbra and you were looking up at the sky?
Answer:
clouds?
Explanation:
im sorry i just wanted the 23 points
Please help-- 15 pts!
What kind of liquid will have the highest vapor pressure value?
a liquid with weak intermolecular forces and a low temperature
a liquid with weak intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a low temperature
Happy Holidays!!
Answer:
a liquid with weak intermolecular forces and a high temperature
Explanation:
According to encyclopedia Britannica, "Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid."
This implies that the vapour pressure of a liquid tends to increase as the temperature of the liquid increases. Recall that vapour pressure also depends on the magnitude of intermolecular forces. The greater the magnitude of intermolecular forces, the lower the vapour pressure hence water has very much higher vapour pressure than ethane.
Answer:
A liquid with weak intermolecular forces and a high temperature
Explanation:
I just took the test and got it right
Please help-- 16 pts!
A sample of oxygen gas (O2) applies 152 mmHg pressure on the walls of an 11.2 L steel container at 273 K. Assume ideal gas behavior. The ideal gas constant is 62.36 (L·mmHg)/(K·mol), and the molar mass of oxygen gas is 32 g/mol.
How many grams of oxygen gas are in the steel container?
16 g
1.6 g
32 g
3.2 g
Answer:
B) 1.6 g
Explanation:
**********************************************
True or false: an amplifier can adjust the amplitude
Answer:
ᴛʀᴜᴇ.................
Base your answer on the information below. Polonium-210 occurs naturally, but is scarce. Polonium-210 is primarily used in devices designed to eliminate static electricity in machinery. It is also used in brushes to remove dust from camera lenses. Polonium-210 can be created in the laboratory by bombarding bismuth-209 with neutrons to create bismuth-210. The bismuth-210 undergoes beta decay to produce polonium-210. Polonium-210 has a half-life of 138 days and undergoes alpha decay. Determine the total mass of an original 28.0-milligram sample of Po-210 that remains unchanged after 414 days. Show the math setup, the arrows, and your answer for full credit.
Answer:
3.5 milligram
Explanation:
From;
N/No = (1/2)^t/t1/2
Where;
N = amount of Po-210 that remains unchanged after 414 days
No = 28.0 milligram of Po-210 originally present
t = 414 days
t1/2 = half life of Po-210 = 138 days
Substituting values;
N/28 = (1/2)^414/138
N/28 = (1/2)^3
N/28 = 1/8
8N = 28
N = 28/8
N = 3.5 milligram
Which of the following steps will slow down the reaction between coal and oxygen?
Answer:
decrease temperature of the oxygen
Explanation:
Answer: I believe it it decrease temp of oxygen
Explanation:
what is meant by polimer
Answer:
i don't knoblol
Explanation:
i don't know lol
Answer:
a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller molecules with the elimination of water, alcohol, or the like, as nylon. a compound formed from two or more polymeric compounds.
Explanation:
HOPE IT HELPS YOU:))
100 cm3 of hydrogen is mixed with 25 cm3 of oxygen at a temperature of 150qC. The gases react as shown in the equation below. 2H2(g)+ O2(g) o 2H2O(g) The total volume of gas present at the end of the reaction is A 50 cm3 B 100 cm3 C 125 cm3 D 150 cm
Answer:
B 100 cm3
Explanation:
The balanced equation is given as;
2H2(g)+ O2(g) --> 2H2O(g)
From the reaction stochiometry, 2 cm3 of H2 would react with 1 cm3 of O2 to form 2 cm3 of H2O
Before Reaction --> 100cm3 of H2, 25cm3 of O2, 0cm3 of H2O
During Reaction --> 50cm3 of H2, 25cm3 of O2, 50cm3 of H2O
(Oxygen is sed uup in the reaction)
After Reaction --> 50cm3 of H2, 0cm3 of O2, 50cm3 of H2O
Total volume left = Unreacted H2 (50cm3) + 50cm3 of H2O formed
Total Volume left = 50 + 50 = 100cm3
The total volume of gas present at the end of the reaction is 100 cm³
What is a chemical reaction?a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
The balanced equation is given as;
2H₂(g)+ O₂(g) → 2H₂O(g)
From the reaction stoichiometry, 2 moles of H₂ would react with 1 mole of O₂ to form 2 moles of H₂O
Before Reaction: 100cm³ of H₂, 25cm³ of O₂, 0cm³ of H₂O
During Reaction: 50cm³ of H₂, 25cm³ of O₂, 50cm³ of H₂O
(Oxygen is used up in the reaction)
After Reaction: 50cm³ of H₂, 0cm³ of O₂, 50cm³ of H₂O
Total volume left = Unreacted H₂ (50cm³) + 50cm³ of H₂O formed
Total Volume left = 50 + 50 = 100cm³
Hence, The total volume of gas present at the end of the reaction is 100 cm³
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Balance the equation
__Ni(CIO)3 → _NiCl2+ _02
the diagrams represent the same number of particles of a gas in 2 containers D snd E, Which have different volume. the two containers are at the same temperature.
in which container will the pressure be higher ?explain your answer
In container E, the pressure will be higher than container D
Further explanationGiven
Container with :
the same particlesthe same temperaturethe different volumeRequired
The higher pressure container
SolutionBoyle's Law stated that :
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
From the diagram (picture), it shows that the volume of container D is greater than container E, so the pressure applied to container D will be less than the pressure applied to container E
Hi! Can you help me with this?
Is a hydrogen gas a element, compound, or mixture?
Answer:
Hydrogen gas (H2) is a molecule, but not a compound because it is made of only one element. Water (H2O) can be called a molecule or a compound because it is made of hydrogen (H) and oxygen (O) atoms.
Explanation:
Hope this helped!!!
-BB
please mark me brainly
Answer:
It's an element. :)
Explanation:
Which is a better estimate for the volume of a fish bowl?.
1 gallon
1 cup
Answer: 1 gallon
Explanation:
Answer:
1 gallon
Explanation:
because gallons are constisting of cups and 1 cup wont be enough for a fish to swim
Please help me:(
Mr. Jacob is teaching his class about the various changes of Earth’s Surface over time. He wants his students to explain the evidence that supports the claim that fossils can show proof of the changing of Earth’s surface. Which of the following statements best explains how students can use fossils as evidence?
Question 4 options:
Plant fossils can be used as evidence of Earth’s surface changing because similar fossils found in various locations supports that Earth was once a supercontinent.
Plant fossils can be used as evidence of Earth’s surface changing because different fossils found in one specific location on earth supports that earth was once a supercontinent.
Animal fossils can be used as evidence of Earth’s surface changing because different fossils found in various locations supports that Earth was once a supercontinent.
Animal fossils can be used as evidence of Earth’s surface changing because similar fossils found in one specific location of earth supports that Earth was once a supercontinent.
Answer:
A
Explanation:
Convert 4.92L of hydrogen at STP to moles
Answer:
0.22moles
Explanation:
Given parameters:
Volume of gas = 4.92L
Unknown:
Number of moles = ?
Condition = STP
Solution
At STP, the number of moles of a given gas is expressed as;
Number of moles = [tex]\frac{volume given}{22.4}[/tex]
Number of moles = [tex]\frac{4.92}{22.4}[/tex] = 0.22moles
Iron (ii) chloride solution is changed into Iron(iii) chloride solution after sometime,
give a reason. ( 26Fe)
Answer:
See explanation
Explanation:
When left to stand, a solution of Iron II chloride is converted to Iron III chloride by oxidation in air.
The Iron III chloride is composed of weak field ligands in its coordination sphere. These weak field ligands mostly occur in a high spin configuration hence, the central iron atom can be converted from Fe[(H20)6]^2+ .2Cl^-(high spin d6) to Fe^3+[(H20)6]^3+ .3Cl^-(high spin d5).
A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?
Question 4 options:
A Hot water heated the aluminum foil.
B The liquid solution changed color.
C The pan was lined with aluminum foil.
D The hot water cooled.
Answer:
c lined with aluminum foil