Answer:
3 mol MgO : 2 mol Fe
Explanation:
Please help me solve this question. Tell the method too
The answer is - 4 thats the charge of Si O
⁴ ¹0
When a calcium atom becomes an ion, it
gains one proton
Loses one electron.
gains two electrons.
Loses two electrons.
Explanation:
Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic compounds.
Cations
A neutral sodium atom is likely to achieve an octet in its outermost shell by losing its one valence electron.
Na→Na++e−(4.7.1)(4.7.1)Na→Na++e−
The cation produced in this way, Na+, is called the sodium ion to distinguish it from the element. The outermost shell of the sodium ion is the second electron shell, which has eight electrons in it. The octet rule has been satisfied. Figure 4.7.14.7.1 is a graphical depiction of this process.
Figure 4.7.14.7.1: The Formation of a Sodium Ion. On the left, a sodium atom has 11 electrons. On the right, the sodium ion only has 10 electrons and a 1+ charge.
Anions
Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions. Most nonmetals become anions when they make ionic compounds.
A neutral chlorine atom has seven electrons in its outermost shell. Only one more electron is needed to achieve an octet in chlorine’s valence shell. (In table salt, this electron comes from the sodium atom.)
e−+Cl⟶Cl−(4.7.2)(4.7.2)e−+Cl⟶Cl−
In this case, the ion has the same outermost shell as the original atom, but now that shell has eight electrons in it. Once again, the octet rule has been satisfied. The resulting anion, Cl−, is called the chloride ion; note the slight change in the suffix (-ide instead of -ine) to create the name of this anion. Figure 4.7.24.7.2 is a graphical depiction of this process.
Figure 4.7.24.7.2: The Formation of a Chlorine Ion. On the left, the chlorine atom has 17 electrons. On the right, the chloride ion has 18 electrons and has a 1− charge.
The names for positive and negative ions are pronounced CAT-eye-ons and ANN-eye-ons, respectively.
In many cases, elements that belong to the same group (vertical column) on the periodic table form ions with the same charge because they have the same number of valence electrons. Thus, the periodic table becomes a tool for remembering the charges on many ions. For example, all ions made from alkali metals, the first column on the periodic table, have a 1+ charge. Ions made from alkaline earth metals, the second group on the periodic table, have a 2+ charge. On the other side of the periodic table, the next-to-last column, the halogens, form ions having a 1− charge. Figure 4.7.34.7.3 shows how the charge on many ions can be predicted by the location of an element on the periodic table. Note the convention of first writing the number and then the sign on a ion with multiple charges. The barium cation is written Ba2+, not Ba+2.
IF ANSWER I WILL GIVE BRAINLESS
Question 9 (4 points)
If the 2nd Level consumers had 10 joules of energy in this food chain, how much energy was at the producer level?
Question 10 (4 points)
Why doesn't the total amount of energy from the producers make it to the owl? What evidence supports your answer?
Answer:
Answer 9 - 100 joules energy was at the producer level
Answer 10 - Remaining energy is used in metabolism
Explanation:
Answer 9
The energy at each trophic level is only 10% of the energy at its previous trophic level.
The energy at producer level is X
[tex]10[/tex] % of [tex]X = 10[/tex] Joules
[tex]\frac{10}{100} * X = 10\\X = 100[/tex]Joules
Answer 10
Because the remaining 90% energy is utilized by the producer for its metabolism
What is the physical composition of our
air? What types of things is our air made
up of? Describe what it may look like, its
size, etc.
Answer:
Air is mainly a mixture of two gases.
Explanation:
Air is mainly a mixture of two gases, nitrogen (around 78%) and oxygen (around 21%). It also contains carbon dioxide (around 0.03%), noble gases (around 0.9%), water vapour and a very small amount of other kinds of gases. Air makes up the atmosphere, which is essential for life on Earth.
(FYI, argon has the highest percentage of composition among the noble gases)
The products of a chemical reaction are chemically different substances than the reactants of a chemical reaction.
True or false?
this statement is true
Answer:
Hope it helps u
3. The total pressure of helium and Argon gas in a closed cylinder is 3.0 atm. If the partial pressure of the Argon is 0.365 atm, what is the partial pressure of the helium?
The diameter of a circle is 14 kilometers. What is the circle's circumference?
Answer:
C = 43.96
Explanation:
Formula:
C = 2πr
r = 14/2 = 7
C = 2(3.14)(7)
C = 43.96
How many moles are there in 5.80 X 1024 molecules of sodium sulfate, Na2SO3?
Answer:
[tex]\boxed {\boxed {\sf 9.63 \ mol \ Na_2SO_3}}[/tex]
Explanation:
To convert from molecules to moles, Avogadro's Number: 6.02*10²³ must be used. This number is the amount of particles (molecules, atoms, etc.) in 1 mole of a substance. In this case, the particles are molecules of sodium sulfate. Let's create a proportion.
[tex]\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}[/tex]
Multiply by the given number of molecules.
[tex]5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}[/tex]
Flip the fraction so the molecules of sodium sulfate cancel.
[tex]5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23} \ molecules \ Na_2SO_3}[/tex]
[tex]5.80 *10^{24} *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23}}[/tex]
[tex]\frac{ 5.80 *10^{24} \ mol \ Na_2SO_3}{6.022 *10^{23}}[/tex]
Divide.
[tex]9.63135171 \ mol \ Na_2SO_3[/tex]
The original measurement has 3 significant figures (5, 8, and 0), so our answer must have the same.
For the number we calculated that is the hundredth place. The 1 in the thousandth place tells us to leave the 3.
[tex]9.63 \ mol \ Na_2SO_3[/tex]
There are about 9.63 moles of sodium sulfate
How many molecules are in 4.5 grams of N20?
1.44
⋅
10
24
molecules
N
2
This would means that there would be
2.88
⋅
10
24
atoms
N
2
Explanation:
What effect does water have on the viscosity of magma?
Answer:
Water decreases the viscosity of magma, which is basically how thick or runny a liquid is.
What is enthalpy and how is it different than heat?
Answer:Heat is a transfer of energy due to a temperature difference. Enthalpy is the change in amount of heat in a system at constant pressure. You can only use heat and enthalpy interchangeably if there is no work being done to the system.
Explanation:
i need a short paragraph (about two sentences) describing the geologic time scale.
The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
The graph shows temperature anomalies for Earth over the
last 800,000 years. A temperature anomaly is a variation
from the average temperature. A positive temperature
anomaly indicates a temperature that is higher than
average.
-600,000
-800,000
-200,000
-400,000
Year
Which two trends do the data show?
Please help ASAP !!
Answer:multiple periods of warmer, and there are natural cycles or warmer.
Explanation: trust me
4) How many atoms are present in a sample of oxygen, O2 with 12.222 moles?
Answer:
two oxygen atoms
a 13.5 liter balloon is heated from 248k to 324k. what will it's new volume be?
Answer:
The new volume is approximately 17.637 liters
Explanation:
The given parameters in the question are;
The initial volume of the gas, V₁ = 13.5 Liter
The initial temperature of the gas, T₁ = 248 K
The new temperature of the gas, T₂ = 324 K
A balloon containing gas that experiences an increase in the temperature of the gas content under constant pressure obeys Charles law which states that the volume of a given mass of gas is directly proportional to its Kelvin temperature is expressed mathematically as follows;
[tex]\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}[/tex]
Where;
V₁ = The initial volume of the gas
T₁ = The initial temperature of the gas
V₂ = The new volume of the gas
T₂ = The new temperature of the gas
From the question, we have;
V₁ = 13.5 Liter
T₁ = 248 K
T₂ = 324 K
Therefore, we have;
[tex]{V_2}= \dfrac{V_1}{T_1} \times T_2[/tex]
[tex]{V_2}= \dfrac{324 \ K}{248 \ K} \times 13.5 \ L=17\dfrac{79}{124} \ L\approx 17.637 \ L[/tex]
The new volume, V₂ ≈ 17.637 L.
Which of the following would be a part of an environment engineer's job description ?
Answer:
where is the options
Explanation:
give options
How many moles are in 1.51 x 10^24 molecules of water?
Answer:One mole of HBr has 6.02 x 1
0
23
molecules of HBr.
1 mole of HBr = 6.02 x 1
0
23
molecules of HBr.-----(a)
X mole of HBr has 1.21 x
10
24
molecules of HBr.
X mole of HBr = 1.21 x
10
24
molecules of HBr------(b)
Taking ratio of (a) and (b)
X / 1 = 1.21 x
10
24
/ 6.02 x 1
0
23
X= 2.009 moles.
Explanation:
Why is the greenhouse effect important to life on Earth?
A. The greenhouse effect absorbs x-rays in the winter time.
B. The greenhouse effect helps Earth’s atmosphere hold in heat.
C. The greenhouse effect makes it much colder at the North and South poles.
D. The greenhouse effect reflects harmful radiation into the upper atmosphere.
Answer:
b
Explanation:
Answer:
d
Explanation:
In simplest terms, "greenhouse gases" let sunlight through to the earth's surface while trapping "outbound" radiation. This alters the radiative balance of the earth (see Figure A. 1) and results in a warming of the earth's surface.
what is on the left side ?
Answer:
reactants
Explanation:
I can be formed into a sheet, I am high in luster, and am a very good conductor. I must be a ...
a
metal
b
nonmetal
c
metalloid
d
noble gas
Answer: metal
Explanation:
Please helppppppppppppppppppp
50 ppoints
Answer:
I can’t see the whole page
Explanation:
which two statements correctly describe the theory of plate tectonices
Answer:
It explains how continents have shifted over time and It was developed based on data that scientists collected about the ocean floor.
If 3.1 moles of potassium chloride react with oxygen, how many moles of potassium chlorate would be produced?
Answer: 19 dollar fortnite card Explanation:who wants it
I NEED HELP PLS PLS PLS
you want 200 mL of a 0.1 g/mL solution of sugar. how do you prepare the solution?
A compound MBr4 has a relative formula mass of 439
What is the relative atomic mass of M (Br=80)
Answer:
119
Explanation:
because the molecular mass of MBr can be found by adding the individual atomic masses of the molecule
Molar mass of M + 4(Molar mass of Br)= Molar mass of
MBr
Molar mass of M +4(80)= 439
Molar mass of M +320 = 439
Molar mass of M = 439 -320
Molar mass of M =119
PLEASE HELP WILL GIVE BRAINLIEST AND 100 POINTS
the answer to your question is C
9. The pH of an acidic solution is
A) greater than 14.
B) greater than 7.
C) less than 0.
D) less than 7.
Answer: d
Explanation:
If you are correct you get a brainless
(07.01 MC)
As a part of the life cycle of plants, the plant must begin with an embryo. What statement best describes where the embryo can be found in flowering and non-flowering plants? (2 points)
periodiate has how many oxygen
2
3
4?
Answer:
4
Explanation:
it has 4 oxygen
hope this helps
Answer:
The law companies that value excessive ethics comply with the legal guidelines not solely in letter however go past what