Answer:
covection
Explanation:
information taken from an existing classified source
Why is Potassium not used in school laboratory
Potassium Metal Is Explosive— Do Not Use It! The reaction of sodium with water is a spectacular and essential classroom demonstration. Many teachers want to show also the more violent reaction of potassium. We propose not to do so because explosions can happen even before the metal is in contact with water.
- BRAINLIEST answerer
Answer:
Explanation:
Potassium and cold water are not used to prepare hydrogen in laboratory because: 1. Potassium is highly reactive metal and it reacts violently with cold water. 2.
An atom's Lewis dot structure has three dots. Which of the following elements could it be, and why? (4 points)
Group of answer choices
Aluminum, because it is in group 13 and has three valence electrons.
Lithium, because it is a group 1 element with three total electrons.
Magnesium, because it is in period 3 and has three valence electrons.
Potassium, because it is an alkali metal and has three inner shell electrons.
Answer:
Aluminum, because it is in group 13 and has three valence electrons.
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. So Option A is correct option.
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
It is given that the Lewis dot structure of molecule contain only 3 electron. That means that element contains 3 electrons in its valence shell.
Aluminum's electronic configuration is 2,8,3
Lithium's electronic configuration is 2,1
Magnesium's has electronic configuration as 2,8,2
Potassium's electronic configuration is 2,8,8,1
Thus Aluminum is the only element that has 3 electron in its outermost shell So, Option A is correct option
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Which of the below is NOT TRUE about ionic and covalent bonds.
Question 3 options:
Ionic bonds are stronger than covalent bonds.
Covalent bonds are stronger than ionic bonds.
Ionic bonds form salts that may rapidly dissolve in water.
Ionic bonds exchange electrons while covalent bonds share electrons.
Which of the below is NOT TRUE about ionic and covalent bonds.
Answer : Ionic bonds are stronger than covalent bonds.
Hope this helps you!
I need help with this
What is the most common injury caused by working with machines unsafely?
Answer:
The most common injury caused by working with machinery are cuts and burns.
Explanation:
Cuts and burns are the most common injury caused by working with machines unsafely.
What is injury?Any physiological harm to living tissue brought on by acute physical stress is referred to as an injury. An injury can be brought on by a blunt trauma, a piercing trauma, burning, exposure to chemicals, asphyxiation, or overexertion, and it can also happen accidentally. Any area of the body can become injured, and each injury has a unique set of symptoms.
Major injuries are normally treated by a medical practitioner, and the type of treatment depends considerably on the injury. The most frequent reason for accidental human injury or injury-related death is traffic crashes. Chronic conditions are different from injuries. Cuts and burns are the most common injury caused by working with machines unsafely.
Therefore, Cuts and burns are the most common injury caused by working with machines unsafely.
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((11.34-9.63)/11.34) 100.00
Perform the following operations giving the proper number of a significant figure in the answer
Basically I need to round it and I don’t know how to please help
Answer:
15.1
Explanation:
(11.34 -9.63)/11.34)0100.00
(1.71/11.3) X 100.00
0,151 X 100.0 = 15.1
how many valence electrons are there in an argon atom?
Answer:
The element argon is in column 8A and is a noble gas. Nobles gases are completely stable because their outershell is filled with all eight electrons. Argon has eight valence electrons.
mmmmmmmmmmmmmtyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
Answer:
Yes.
Explanation:
Answer:
=0=0==00=0=0=
Explanation:
can i have Brainliest i need 1 more
Mike mixes two chemicals in a container. The container quickly becomes very hot.
What can be said about this reaction?
Answer:
It is a exothermic reaction.
Explanation:
Exothermic reactions release energy to their surroundings.
(pls mark brainliest.)
Explain why the invention of the microscope led to the discovery of cells.
Answer:
Because people can now see microscopic items
Explanation:
People can now see the cells because they are so small we cant see them with the enhanced microscope we can see everything that's micro
10 What is a characteristic of all living organisms?
A breathing
Begestion
C
excretion
D ingestion
Answer:
D - ingestion
Explanation:
Which statement best describes alpha decay?(1 point)
After the ejection of an alpha particle, the remaining nucleus has a mass number that is two less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
After the ejection of an alpha particle, the remaining nucleus has a mass number that is two less and an atomic number that is two less, so alpha decay is not a type of nuclear fission.
After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
Answer:
After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
What is nuclear fission?Nuclear fission is the disintegration of a radioactive material into smaller elements.
In radioactivity, there are various particles as follows:
alpha particleBeta particleGamma particleAlpha particle is characterized by the possession of mass number of 4 and atomic number of 2 i.e. He⁴/2.
Therefore, if a substance undergoes alpha decay, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
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how is a standard hydrogen atom different from a hydrogen ion?
Answer:
a hydrogen ion will have more or fewer electrons than a standard hydrogen atom.
Explanation:
ions are atoms that have lost or gained elections. this applies to ions in general.
do diastereomers have different physical properties
Answer:
Diastereomers can have different physical properties and reactivity. They have different melting points and boiling points and different densities.
don’t mind the bottom part just that question ! :)
Answer:
the charge of an atom is shown with a superscript
Where is a alcohol thermometer used?
Explanation:
Ethanol-filled thermometers are used in preference to mercury for meteorological measurements of minimum temperatures and can be used down to −70 °C (−94 °F). The physical limitation of the ability of a thermometer to measure low temperature is the freezing point of the liquid used.
Hot metal (85 °C) is placed in water (20 °C). When the system reaches thermal
equilibrium, the temperature is 22.25 °C. Why is the temperature at thermal equilibrium
so close to that of water's initial temperature?
The equilibrium temperature is close to the initial temperature of water because water has a greater heat capacity compared to the hot metal, and it will require more energy to raise the low temperature of water.
The given parameters;
initial temperature of the hot metal, t₁ = 85 ⁰Cinitial temperature of the water, t₂ = 20 ⁰Cequilibrium temperature of the mixture, t = 22.25 ⁰CAccording to principle of conservation of energy, the heat lost by a hot body is equal to heat gained by a cold body.
[tex]Q_{hot} = Q_{cold}[/tex]
The equilibrium temperature is close to the initial temperature of water because water has a greater heat capacity compared to the hot metal, and it will require more energy to raise the low temperature of water.
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rays with short wavelengths that are the least penetrating, produce chemical effects, and kill germs are
Answer:ultraviolet rays
Explanation:
what is the wavelength of radio waves that have a frequency of 3.20 x 1010 hz?
Answer:9.38 x 10^−3 m
Explanation:
Answer: 9.38 x 10^−3 m
Explanation:
what are the basic postulates of kinetic molecular theory?
Answer:
Five Postulates of KMT.
Gas particles travel in straight lines unless they collide with other particles or the walls of the container.
Gas particles have negligible volume compared to the free space between them..
Molecular collisions are perfectly elastic and kinetic energy is conserved.
Gas particles experience negligible intermolecular forces, there are no attractive or repulsive forces between particles.
The average kinetic energy of the particles in a sample of gas is proportional to the absolute temperature.
The fifth postulate is very important to note as it relates kinetic energy to temperature.
For a gaseous particle most of the kinetic energy is in translation.
Plz help it’s for chemistry!!
Answer:
Oxygen is negative charge
Explanation:
And The 2 Hydrogens are positive charges
What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
O A.
2 mol
6L
ОВ.
6L
2 mol
O c.
6 mol
2L
O D.
2L
6 mol
Answer:
C: [tex]\frac{6 mol}{2 L}[/tex]
Explanation:
we can use the molarity equation
[tex]M = \frac{mol}{L}[/tex]
so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:
[tex]\frac{6 mol}{2 L}[/tex]
Answer:6 mol/2L
Explanation:just took the quiz
Identify the charges of the protons, neutrons, and electrons.
Identify the charges of the protons, neutrons, and electrons.
protons +1, neutrons 0, electrons -1
protons 0, neutrons -1, electrons +1
protons +1, neutrons -1, electrons 0
protons 0, neutrons +1, electrons -1
Answer:
protons are positively charged (+1) neutrons have no charge (0) electrons are negatively charged (-1)
tijuan mixed a solid and a liquid together in a beaker
Which definition bests describes an hydrogen bond?
(a) A bond between an highly electronegative element and hydrogen
b.A bond between two non-metals
c.A bond between a metal and a non-metal
d.A bond involving sharing of electrons
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
the properties of a substance that can be observed without altering its identify physical property. true false ?
Answer:
True
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.
If 45.0 liters of oxygen is measured at 24.0C, what would be its volume at standard temperature?
giving brainlist to best answer that shows work!!!!
The volume of the oxygen gas at standard temperature is 41.36 liters.
The given parameters;
initial volume of oxygen, V₁ = 45 Ltemperature of oxygen, T₁ = 24 ⁰C = 297 Kstandard temperature, T₂ = 0 ⁰C = 273 KThe volume of the oxygen gas at standard temperature is determined by applying Charles law as shown below;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2} \\\\V_2 = \frac{V_1 T_2}{T_1} \\\\V_2 = \frac{45 \times 273}{297} \\\\V_2 = 41.36 \ L[/tex]
Thus, the volume of the oxygen gas at standard temperature is 41.36 L.
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SnO is a different compound than SnO2. What is the difference regarding the cation?
Answer:
Sn has a different charge in each of the compounds.
+2, +4 charges, respectively.
Explanation:
SnO has subscripts of 1, which means it takes only one of each element to make the compound.
We know that oxygen's charge is -2 from the periodic table.
In order for the compound to be neutrally charged,
Sn + O = 0
Sn - 2 = 0.
So, Sn has a +2 charge.
Likewise with the second compound, we know O has a -2 charge.
Sn + 2*(-2) = 0
Sn - 4 = 0
Sn = +4
+2 and +4 are different charges on the Sn cation.
