how many valence electrons are there in a magnesium atom?
Answer:
Magnesium has 2 valence electrons.
what is an electron ?state it's relatively mass and charges.
Answer:
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
mass: 9.1093837015 × 10−31 kg
charges: fundamental physical constant expressing the naturally occurring unit of electric charge, equal to 1.602176634 × 10−19 coulomb.
Explanation:
good luck !<3
how many moles of c are formed upon complete reaction of 2 mol of b according to the generic chemical reaction: a 2b->c
Answer:
1 mol
Explanation:
It's about balacing the equation. 2 parts "b" can form 1 part "a". So take 2 mol and divide by 2.
a substance that cannot be separated into simpler substances
Answer:
element
Explanation:
hope this helps
Explanation:
Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
What does displacement reaction tell you about the reactivity of the 2 metals involved?
it tells me that one element is more reactive than the other
Explanation:
using the reactivity series. the element that come above is the most reactive e.g
potassium
sodium
calcium
magnesium....
potassium is more reactive than sodium and the following below
calcium is more reactive than magnesium since it is below it in the reactivity series.
CONCLUSION, reactivity decreases down the reactivity series and increases up the reactivity series. the example i gave is part of the reactivity series of cations but there is also for anions
The temprature at which a solid melts is the same as the temprature at which its luqid form solidifies.TRUE OR FALSE.PLS GUYS HELP ME!
Answer:
The statement is true
Explanation:
The temperature at which a solid melts is the same as the temperature at which its liquid solidifies
its answer is true cause the temprature of melting ice is same as the liquid solidifies
Why are herbivores in level two of a food
web?
Worth 20 points :)
Answer:
Hey mate....
Explanation:
This is ur answer....
They tend to be small in size and there are many of them. The primary consumers are herbivores (vegetarians), Because of this inefficiency, there is only enough food for a few top level consumers, but there is lots of food for herbivores lower down on the food chain. There are fewer consumers than producers.
Hope it helps!
Brainliest pls!
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True or false? Simple molecular substances contain delocalised electrons.
Answer:false
Explanation:
Find the pOH for the following:
A 1.34 x 10^-4 M solution of hydrochloric acid.
A) 10.13
B) 3.87
C) 4
D) 10
Answer:
A) 10.13 is the answer
Explanation:
Since HCl is a strong acid, its pH can be found by simply plugging it into the equation:
pH = -log[H+]
*H+ is just the concentration you were given*
Now that you have the pH, you just subtract it from 14 to find the pOH
I have attatched my work below. Hope this helps! :^)
To find the pOH of a solution, you can use the formula: pOH = -log10[OH-]
What is pOH?pOH is a measure of the concentration of hydroxide ions (OH-) in a solution. It is the negative logarithm (base 10) of the hydroxide ion concentration.
In this case, since we have hydrochloric acid (HCl), we need to consider the concentration of hydroxide ions (OH-) produced when HCl dissociates in water.
HCl is a strong acid and completely dissociates, meaning it produces an equal concentration of hydrogen ions (H+) and chloride ions (Cl-) in water. Since there are no hydroxide ions produced, the concentration of hydroxide ions is 0.
Therefore, the pOH of a hydrochloric acid solution is 0, and none of the options provided (A, B, C, D) is the correct answer.
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• Describe evidence that convection cycles/cells exist within the Earth's core and how they connect to
sea floor spreading and subductio zones
Explanation:
Seafloor spreading and other tectonic activity processes are the result of mantle convection .Mantle conversion is the slow churning motion of Earth’s mantle convection carry heat from the lower mantle and core to lithosphere
If, it helps you than mark me as brainlistWhich process requires water to gain heat energy from th
environment?
O condensation
O evaporation
infiltration
precipitation
Answer:
Evaporation, please mark me Brainliest
Which of the following shows a valid combustion reaction?
2Al + 2O2 → 2AlO + O2
C2H4 + 3O2 → 2CO2 + 2H2O
2CH4 + O2 → 2CO + 4H2
Ca + O2 → CaOH
Combustion reaction means two common products
CO_2H_2OOption B is correct
[tex]\\ \sf\longmapsto C_2H_4+O_2\longrightarrow 2CO_2+2H_2O[/tex]
Which phrase best describes the vapor point of a substance?
the strength of the bonds between molecules of a substance that is in a gaseous state
the amount of heat energy required to change a substance from a liquid to a gas
the temperature at which additional heat energy causes the substance to change from a liquid to a gas
the average kinetic energy of the molecules of a substance in its gaseous state
The phrase which best describes the vapor point of a substance is Choice C; the temperature at which additional heat energy causes the substance to change from a liquid to a gas.
The vapour point of a substance by definition is the state of a substance at which upon addition of any amount of heat energy; he substance undergoes a phase change from liquid to solid.
Read. more;
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Carbon dioxide, when present in sufficient amounts, will bind with water to form ____________ , which is capable of dissociating into bicarbonate and hydrogen ions.
Answer:
Carbon dioxide, when present in sufficient amounts, will bind with water to form carbonic acid, which is capable of dissociating into bicarbonate and hydrogen ions.
Explanation:
With the help of carbonic anhydrase which further catalyzes the reaction to convert carbonic acid back into carbon dioxide and water. The carbon dioxide is then expelled from the lungs.
how long does it take to cook a 12 pound turkey in the oven
In the malate-aspartate shuttle, _____ is reduced to _____ in the cytosol. oxaloacetate; malate aspartate; malate malate; aspartate malate; oxaloacetate aspartate; oxaloacetate
The malate-aspartate shuttle enables oxidative phosphorylation by allowing electrons to be moved across the inner membrane in the mitochondrion during glycolysis in eukaryotes.
In this malate-aspartate shuttle, oxaloacetate is reduced to malate in the cytosol.
During this biochemical system process, the cytosolic malate dehydrogenase which is the primary enzyme present in this shuttle system catalyzes the reaction of oxaloacetate and NADH to produce malate and NAD in the cytosol. This system enables oxidative phosphorylation in eukaryotes.Learn more: https://brainly.com/question/17216910
if the column of water in the water barometer rose to a height of 39 feet, what would the atmospheric pressure be in mm hg?
The atmospheric pressure for a column of water barometer that rose to 39 feet is 874 mmHg
From the given information, to determine the atmospheric pressure at which the column of the water barometer rose, we will need to convert the height of the water column to mmHg.
From the dimensional analysis of standard rate conversion, we know that:
1 feet = 12 inches
1 inch = 25.4 mm
1 mmHg = 13.6 mm of water.
∴
[tex]\mathbf{\implies 39 \ feet \ of \ H_2O \times \dfrac{12 \ in ch \ H_2O}{1 \ feet \ H_2O} \times \dfrac{25.4 \ mm \ H_2O}{1 \ inch \ H_2O} \times \dfrac{1 mmHg}{13.6 \ mm \ H_2O}}[/tex]
= 874.058 mmHg
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In Valence Shell Electron Pair Repulsion Theory (VSEPR),
A Bonded electron pairs cancel each other out and do not repel other electrons
B Bonded electron pairs are more repulsive than lone pairs on the central atom
C Bonded electron pairs are less repulsive than lone pairs on the central atom
D Bonded electron pairs are equally as repulsive as lone pairs on the central atom
Answer: look at the close because that is the answer
Explanation:
things which are matter but not substance
Answer:
Vacuum
Explanation:
It may be bounded by a volume. Energy: Light, heat, kinetic and potential energy, and sound are non-matter because they are massless. Objects that have mass and are matter may emit energy.
A chain reaction is created in a nuclear plant when U-235 in the fuel rods is bombarded with _____, causing the nucleus to become unstable and split.
Answer:
nuclear fission.
that's the answer
pls help asap....................
Which ion has the correct charge?
07-
Na 2+
N 3+
Ca2+
Answer:
Ca(2+)
Explanation:
Sodium (Na) only have one valence electron and will lose it in order to gain a full octet. There will be an unbalance of electrons and protons where there are more protons there electrons. The correct ion formula for sodium is Na (1+).
Nitrogen has 5 valence electrons and will gain three more to gain a full octet. There will be an unbalance where there are more electrons then protons. Nitrogen will form the ion N (3-).
Calcium has two valence electrons and will lose them in order to gain a full octet. There will be an unbalance where there are more protons then electrons. Calcium will form the ion Ca 2+
Therefore, Ca2+ is the ion with the correct charge.
The reaction is at dynamic equilibrium.
N2 + 3H2 ⇌ 2NH3
Which statement is correct?
(1 point)
The solution has the same concentrations of nitrogen gas and ammonia.
The solution has the same concentrations of nitrogen gas and ammonia.
Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
The solution has the same concentrations of nitrogen and hydrogen gases.
The solution has the same concentrations of nitrogen and hydrogen gases.
Both directions of the reaction have stopped.
Both directions of the reaction have stopped.
When the reaction N₂ + 3 H₂ ⇌ 2 NH₃ is at dynamic equilibrium, Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
The reaction is at dynamic equilibrium.
N₂ + 3 H₂ ⇌ 2 NH₃
Which statement is correct?
The solution has the same concentrations of nitrogen gas and ammonia. NO. Even though we don't know the equilibrium constant, it is unlikely that N₂ and NH₃ have the same concentrations at equilibrium. Nitrogen and hydrogen combine at the same rate that ammonia breaks down. YES. At the equilibrium, the forward rate is equal to the reverse rate. The solution has the same concentrations of nitrogen and hydrogen gases. NO. Even though we don't know the equilibrium constant, it is unlikely that N₂ and H₂ have the same concentrations at equilibrium. Both directions of the reaction have stopped. NO. The reactions don't stop because the equilibrium is dynamic.When the reaction N₂ + 3 H₂ ⇌ 2 NH₃ is at dynamic equilibrium, Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
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A sample of SO2 gas occupies 45.6 L at 373 K and 3.45 atm. How many moles of oxygen atoms?
Answer:
10.3
Explanation: i have this as a assignment rn sooo here you go :)
Elige la respuesta que mejor describe cómo difieren el Monte Everest y el Valle de la Muerte.
El Monte Everest es plano y el Valle de la Muerte es el punto más alto de la Tierra.
O El Monte Everest es el punto más alto de la Tierra, y Death Valley es una montaña más pequeña.
El Monte Everest es el punto más alto de la Tierra, y el Valle de la Muerte es relativamente plano.
Answer:
El Monte Everest es el punto más alto de la Tierra, y el Valle de la Muerte es relativamente plano.
Explanation:
When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g). Your lab partner says this is a redox reaction and a combustion reaction. Do you agree? Defend your answer by explaining whether or not it meets the requirements of each type of reaction.
This is a redox reaction but not a combustion reaction.
Redox Reaction
A type of chemical reaction that involves a transfer of electrons or gain of electrons between two-element. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes.
Combustion reaction
It must have two products. CO2 and H2Ooxygen in the reactant is must.
∴ The reaction is Redox ✓ not combustion
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how do you write the names and formulas for ionic compounds with polyatomics
Here are some steps i know from my teacher:
When you write a formula from a home you must follow these rules
1) Write down the name you must follow these rules
2)Write down the symbols for the elements and group in the compound of elements
3)Write down the valency
4)Adjust the number of atoms of each element or group valency is the combining capacity of elements with one another.
HELP ITS TIMED!!!
Refer to the pic
Answer:
3
Explanation:
We have to cancel out the electrons so multipy ionic reaction of Ag by 3 and add it to ionic reaction of Al.
diagram of a separate funnel
Answer:
Separation techniques
Separating Funnel - Separation techniques
Explanation:
if you look this up this should help i think
how many moles of oxygen are in 20 grams of oxygen
Answer:
0.625
Explanation:
If you are referring the O2, first you need to get the relative mass of it. You can see the O's is around 16. but this is O2,you need to multiple it.
16×2=32
We get the equation n=m/M where m is for gram
20/32=0.625mol