The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Answer:
3rd image
Explanation:
Some copper is palced in a previouly weighted crucible and reweighed .
Mass of crucible + copper = 5.92g
Mass of crucible = 4.65g
Clculate the mass of copper used in the experiment
We can find the mass of copper by finding the difference between the mass of the crucible and the copper, and just the crucible. This is possible since the mass that is left would be attributed to just the copper.
Mass of copper = (Mass of crucible + copper) - Mass of crucible
= 5.92 g - 4.65 g
= 1.27 g
Whymilk is taken as mixture
Explanation:
Main compounds of milk are lactose and casein. And it is also called a colloidal mixture (i.e. in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance). Therefore milk is regarded as a mixture not as a pure substance. So this is the required answer.
One of the few resources on Mars is
Answer:
iron .. titanium.. nickel....aluminum... sulfur... and calcium
9) What is the final pressure in the container shown below after the valve is opened and the gases are allowed
to flow? (The gases do not act)
0
4.00 am
3.00
NE
2.00 am
2.00 L
A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.
We have 2 containers connected by a valve.
One container has a volume of 3.00 L and contains O₂ at 4.00 atm. The other container has a volume of 2.00 L and contains Ne at 2.00 atm.
When the valve is opened, the total volume is the sum of the 2 containers.
[tex]V_2 = 3.00 L + 2.00 L = 5.00 L[/tex]
Assuming constant temperature and ideal behavior, we can calculate the final pressure of each gas using Boyle's law.
O₂
[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{4.00atm \times 3.00L}{5.00L} = 2.40atm[/tex]
Ne
[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{2.00atm \times 2.00L}{5.00L} = 0.800atm[/tex]
The final pressure in the container will be the sum of the final pressures of the gases.
[tex]P = 2.40 atm + 0.800 atm = 3.20 atm[/tex]
A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.
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why does magnesium in an aqueous solution of magnesium chloride conduct electricity but solid magnesium chloride does not?
Answer:
Delocalized electrons
Explanation:
Magnesium Chloride is an ionic compound, so its lattice structure prevents the flow of electrons. However, when you convert the ionic compound into an aqueous solution it allows movement of electrons/ions due to the breakdown of the molecular forces which make it conductible. In short, Ionic compounds as a solid are not conductible but they are in an aqueous form.
Please help I will give brainliest ;3
Answer:
oxygen, carbondioxide
carbondioxide, oxygen
can anyone tell me "what are the exceptions of law of reciprocal proportions??"
wht will react with acid to giv bluish green salt nd water ??
Explanation:
When dilute HCl is added to a small amount of copper oxide in a beaker, a greenish-yellow gas is released and a bluish-green solution is formed. Since the metal oxides such as a Copper oxide (CuO) are basic in nature, it reacts with acids such as HCl to form the corresponding salt and water.
write True If the statement Is Correct And False If Not
Answer:
11.false12.true13.true14.false15.true16.false17.false18.false19.true20.false21.PC22.CC23.PC24.CC25.CCExplanation:
I think it is helps youa brief description of atoms and how they relate to
molecules and compounds
Answer:
Explanation:
Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds
When refering to a gas, the higher the temperature, the faster the particles move:
True
False
Answer:
TrueExplanation:
In Gas,The movement of particles depends upon their temperature. When, the temperature is high the movement of the particles is faster.When, the temperature is low the movement of the particles is slower down and move close together.Hence,
The above statement is true for, the gas particles moves faster in high temperature.
c) ¿Qué ocurriría si tenemos disueltos 200 g de
nitrato de potasio en 300 g de agua a 60°C
y enfriamos la disolución hasta los 10 °C?
What is activation energy
Answer: Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into product. It can also be described as the minimum amount of energy needed to activate or energize molecules or atoms so that they can undergo a chemical reaction or transformation.
Explanation:
What gas in our atmosphere is thought to have come from plants and algae alone?
Answer:
Oxegen
Explanation:
All that oxygen has to come from somewhere. You might already know that it comes from photosynthetic organisms like plants.
There is 200 grams of water on a stove. The water is currently 25 C. How much energy in joules must be used to raise the water to 90 C?
Answer:
q
=
64 kJ this is answer. .
How do ionic bonds form?
Quick
Answer:
Explanation: ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
superscript Coefficient
Me think
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
Answer:
b
Explanation:
Describe the nucleus of the
atom.
Answer:
The nucleus of atom is composed of two subatomic particles that each have charges.
Protons, which are positively charged particles.Neutrons, which are neutrally charged particles.Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.
I need help with this question please
1-propanol is the correct answer.
What causes streams to form?
O absorption
O precipitation
O glaciers
O lakes
Answer: essay the answer is B: precipitation
Explanation:
An unknown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.
carbon reduction process is not applied for extraction of alkali metal . why ?
Answer:
The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon
Explanation:
How many grams of hydrogen are needed to fully react 621. 9 grams of nitrogen gas.
Answer:
9 grams of nitrogen gas
Explanation:
Hund's rule: states that electrons always enter an empty orbital before they pair up.
Answer:
true
Explanation:
What is the mass of 1,300 cm of gasoline? The density of gasoline is 0.67 g/cm.
Answer:
Volume x Density = Mass of a substance
1300 x 0.67 = 871
The mass is 871 (unit)
When an organism dies it is exposed to many different types of biotic and abiotic factors biotic factors include?
Answer:
the organisms themselves,other organisms,interactions between living organisms, and even their waste.
Do all particles pass right through the atoms undeflected?
AnswereYs
Explanatioynt:Yes
đơn chất nào sau đây tác dụng với dung dịch axit sunfuric loãng sinh ra khí ?
a đồng
b cacbon
c nhôm
d lưu huỳnh
Answer:
C. Al
Explanation:
2Al+ 3H2SO4(l)------> Al2(SO4)3+ 3H2
Which are effects of long-term exposure to mustard gas? Select all that apply. One, some, or all responses may be correct.
The effects of long-term exposure to mustard gas causes mortality and chronic respiratory disease.
Exposure to mustard gas in the long term can result in mortality from influenza, pneumonia as well as chronic breathing disease. Exposure for long term leads to respiratory complications and septic shock. Extensive breathing in the environment of mustard gas can cause chronic respiratory disease, respiratory infections or death.
Extensive eye exposure to this gas can cause permanent blindness. Exposure to mustard gas may also increase the chances of lung and respiratory cancer so we can conclude that mustard gas is lethal and can cause a number of diseases in a person who is exposed to it.
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