Answer:
8
Explanation:
u can find it on ur chemistry book
Answer:
C. 8
Explanation:
Check chemistry textbook
How do atoms form chemical bonds
Answer:
Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. In a covalent bond, two atoms share one or more electrons.
Reacting 10.0 mL of H2(g) with 10.0 mL of C2H4(g) produces 10.0 mL of C2H6 at 1.5 atm. If the reaction produces 3.1 kJ of heat and the decrease in volume requires the heat surroundings do 7.6 J of work on the gases, what is the change in internal energy of the gases?
Answer:
the change in internal energy of the gases is -3.0924 KJ
Explanation:
The computation of the change in internal energy of the gases is as follows;
Given that
Q = -3.1 KJ
= -3100 J
It is negative as the heat is lost from the mixture
And,
W = + 7.6 J
It is positive as the work is done in the mixture
Now we use the following equation
Delat E = Q + W
= -3100 J + 7.6 J
= -3092.4 J
= -3.0924 KJ
Hence, the change in internal energy of the gases is -3.0924 KJ
hydrocarbon structures methopane
. Consider the following half-reactions:
Ag+(aq) + e– → Ag(s) E = +0.80 V
Cu2+(aq) + 2 e– → Cu(s) E = +0.34 V
Pb2+(aq) + 2 e– → Pb(s) E = –0.13 V
Fe2+(aq) + 2 e– → Fe(s) E = –0.44 V
Al3+(aq) + 3 e– → Al(s) E = –1.66 V
Which of the above metals or metal ions will reduce Pb2+(aq)?
a. Ag+(aq) and Cu2+(aq)
b. Ag(s) and Cu(s)
c. Fe2+(aq) and Al3+(aq)
d. Fe(s) and Al(s)
e. Cu2+(aq) and Fe2+(aq)
d. Fe(s) and Al(s)
Further explanationIn the redox reaction, it is also known
Reducing agents are substances that experience oxidation
Oxidizing agents are substances that experience reduction
The metal activity series is expressed in voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent
So that the metal located on the left can push the metal on the right in the redox reaction
The electrodes which are easier to reduce than hydrogen (H), have E cells = +
The electrodes which are easier to oxidize than hydrogen have a sign E cell = -
So the above metals or metal ions will reduce Pb²⁺ (aq) will be located to the left of the Pb in the voltaic series or which have a more negative E cell value (greater reduction power)
The metal : d. Fe(s) and Al(s)
During which step of this procedure does a chemical change occur?
A. 1
B. 2
C. 3
D. 4
In the reaction of aluminum with iron III oxide, if you start with 54.2 grams of aluminum, how many grams of iron III oxide are needed for the reaction to occur?
Answer:
[tex]m_{Fe_2O_3}=160.41gFe_2O_3[/tex]
Explanation:
Hello!
In this case, since the reaction between aluminum and iron (III) oxide is:
[tex]2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe[/tex]
In such way, since there is 2:1 mole ratio between aluminum (atomic mass = 26.98 g/mol) and iron (III) oxide (molar mass = 159.70 g/mol), we'll be able to compute the mass of the required reactant as shown below:
[tex]m_{Fe_2O_3}=54.2gAl*\frac{1molAl}{26.98gAl}* \frac{1molFe_2O_3}{2molAl}*\frac{159.70gFe_2O_3}{1molFe_2O_3}\\\\m_{Fe_2O_3}=160.41gFe_2O_3[/tex]
Best regards!
In the ground state, an atom of which element has seven valence
electrons?
1.
sodium
2.
phosphorus
3.
nitrogen
4.
fluorine
Answer:
Fluorine
Explanation:
Fluorine has 9 total electrons. The first two are in the 1s level, and the remaining electrons are on the outer level of the atom, with 2 in the s level and 5 in the p level. The electron configuration is 1s2 2s2 2p5.
Please rank the following atoms from smallest to largest: Ge, P, O
A fruit juice has a very sour taste. What does this most likely indicate?
A. The juice is a metal
B. The juice is a salt
C. The juice is an acid
D. The juice is a base
Explanation:
its hard its either B or C i dont wanna be wrong;-;
Answer:
The Juice wouldnt be a metal, Salt isnt that effective in juice if you have sensitive tastebuds. Your answer is C. THe Juice is an acid
Explanation:
What is nuclear fusion what role does it play in the sun
Answer:
Nuclear fusion is when two atomic nuclei combine and form one nucleus. Nuclear fusion generates all of the Sun's energy. Inward pulling by the Sun's gravity is counteracted by outward pushing by the Sun's nuclear fusion; this balance keeps the sun from collapsing or exploding.
Explanation:
Answer:
it converts mass into energy and hydrogen into helium.
Explanation:
Nuclear fusion, the source of all the energy so generously radiated by the Sun
Which of the following shows correctly an ion pair and the correct formula for the ionic compound the two ions form?
A) Cu1+, O2–; CuO
B) Cr3+, I–; CrI
C) Sn4+, N3–; Sn4N3
D) Fe3+, O2–; Fe2O3
Answer:
D) Fe³⁺, O²⁻; Fe₂O₃
Explanation:
Option D shows correctly an ion pair and the correct formula for the ionic compound the two ions form.
Ion pairs of iron and oxygen react to form iron (III) oxide. The iron (III) oxide is one of the oxides of iron. The compound is usually attacked by acids and it is often called rust. It is used in the feedstock of the steel and iron industries. This means that the compound is used in the production of iron, steel, and many alloys.
Below are some equations:
4 Fe + 3 O₂→ 2 Fe₂O₃
Fe⁰ + 3O₂⁰ → Fe³⁺O₃²⁻
What element has the noble gas configuration [Ne]3s23p??
Answer:
Sulfur
Explanation:
The first ten electrons of the sodium atom are the inner-shell electrons and the configuration of just those ten electrons is exactly the same as the configuration of the element neon (Z = 10).
...
Noble Gas Configurations.
Element Name Sulfur
Symbol S
Atomic Number 16
Noble Gas Electron Configuration [Ne]3s23p4
The chemical formula for magnesium oxide is MgO. A chemist determined by measurements that 0.030 moles of magnesium oxide participate in a chemical reaction. Calculate the mass of magnesium oxide that participates.
Answer:
1.209g of MgO participates
Explanation:
In this problem, we have 0.030 moles of MgO that participates in a particular reaction.
And we are asked to solve for the mass of MgO that participates, that means, we need to convert moles to grams.
To convert moles to grams we need to use molar mass of the compound:
1 atom of Mg has a molar mass of 24.3g/mol
1 atom of O has a molar mass of 16g/mol
That means molar mass of MgO is 24.3g/mol + 16g/mol = 40.3g/mol
And mass of 0.030 moles of MgO is:
0.030 moles MgO * (40.3g/mol) =
1.209g of MgO participatesWhat volume of 3.00 M HCl in liters is needed to react completely (with nothing left over) with 0.750 L of 0.100 M Na2CO3?
Answer:
0.0500L of 3.00M HCl are needed to react completely
Explanation:
Hydrochloric acid HCl reacts with sodium carbonate, Na2CO3, as follows:
2HCl + Na₂CO₃ → 2NaCl + H₂O + CO₂
Where 2 moles of HCl reacts per mole of Na₂CO₃
To find the volume of 3.00M HCl needed to react completely we need first to calculate the moles of Na₂CO₃ added and, with this chemical equation we can solve for moles of HCl as follows:
Moles Na₂CO₃:
0.750L * (0.100moles Na₂CO₃ / L) = 0.0750moles
Moles HCl:
0.0750moles Na₂CO₃ * (2 moles HCl / 1 mole of Na₂CO₃) = 0.150 moles of HCl
Volume of 3.00M HCl:
0.150 moles of HCl * (1L / 3.00moles) =
0.0500L of 3.00M HCl are needed to react completelyA scientist claimed that he radiocarbon dated a fossilized skull of a dinosaur and found it to be about 63 million years old. Do you support his claim? Provide at least one scientifically based reason why you do or do not support the claim.
Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate. After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings. Unwilling to challenge the data openly, they erased the report from public view without a word to the authors. When the authors inquired, they received this letter:
Explanation:
i do not own my copyrights
Write the charge balance for an aqueous solution of arsenic acid, H3AsO4, in which the acid can dissociate to H2AsO24 , HAsO24 2, and AsO34 2. Look up the structure of arsenic acid in Appendix G and write the structure of HAsO24 2.
Answer:
Kindly check the explanation section.
Explanation:
When the Arsenic acid,H3AsO4 is put in water it dissociates to form or give out 1 proton, 2 protons or 3 protons that is 1H^+, 2H^+ and 3H^+. Check the equation showing the dissociation reactions as given below;
H3AsO4 ===========> H^+ + AsO4^-
H3AsO4 ===========> 2H^+ + AsO4^2-
H3AsO4 ===========> 3H^+ + AsO4^3-
Therefore, the total charge balance is given as:
[H^+] =[OH^-] + [ AsO4^-] + 2[ AsO4^2-] + 3[ AsO4^3-].
Kindly note that the [OH^-] is from water.
Can anyone solve this?
Answer:
3P2O5:
P:6 O:15
5CO2
C:5 O:10
3C6H12O6
C:18 H:36 O:18
4C6H12
C:24 H:48
3Mg3(PO4)2
Mg:9 P:2 O: 8
4(NH4)2S
N:8 H:32 S:4
Find the element:
1. A group 12 metal that was once used in thermometers, but now it’s know to be poisonous.
2. Has 3 valence electrons and 4 energy levels.
4. The only metalloid with 3 valence electrons.
5. It’s most common isotope has 5 neutrons.
Answer:
.
Explanation:
mercurygalliumboronberyllium
What is the molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate
into 355 mL of water?
Answer: 40 + 2x14 + 6x16 = 164g/mole
54.3g x [1mole / 164g] = 0.331moles
355mL x 1L / 1000mL = 0.355L
molarity = 0.331moles / 0.355L =
00
Explanation:
The molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate into 355 mL of water is 0.9881M
Molarity of solution is the ratio of the number of moles of the substance to the volume.
[tex]Molarity=\frac{n}{V}[/tex]
n is the number of moles of the compound[tex]n=\frac{mass}{molar \ mass}[/tex]Mass of calcium nitrate = 54.3gMolar mass of calcium nitrate = Ca(NO₃)₂ = 164.088 g/mol[tex]n=\frac{54.3}{164.088 } \\n=0.331 moles[/tex]
Get the required molarity;
[tex]Molarity=\frac{0.331}{0.335}\\Molarity= 0.9881 M[/tex]
Hence the molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate into 355 mL of water is 0.9881M
Learn more on molarity here: https://brainly.com/question/19555927
The volume of a gas with an initial pressure of 380 mmHg atm increases from 5.0 L to 8.0 L. What is the final pressure of the gas, in atm, assuming no change in moles or temperature?
A) 238 atm
B) 2.4 atm
C) 0.31 atm
D) 0.80 atm
E) 8.0 atm
Answer:
0.31 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question
760 mmHg = 1 atm
380 mmHg = 0.5 atm
We have
[tex]P_2 = \frac{0.5 \times 5}{8} \\ = 0.3125[/tex]
We have the final answer as
0.31 atmHope this helps you
Which balance equation represents a single replacement reaction
Answer: A single replacement reaction looks sort of like this
A + BC —> AC + B
Explanation: It would be a LOT more helpful for us if you had provided the answer choices for this question, but I'll try to help by explaining WHAT single-replacement reactions are.
Single-replacement reactions are reactions in which one ion displaces another to form a new compound . One reactant is an element; one reactant is a compound . One product is an element; one product is a compound . The reactant element is part of the compound product .
I hope this helped!
8. What energy transformations take place in a simple electric motor?
D. light --> electrical
B. kinetic --> electric
A. chemical => solar
C. electrical -> kinetic
Answer:
I don't know
Explanation:
just wanna talk because I am getting bored.
Answer:
B)
takes mechanical energy and makes it electrical
Explanation:
How many H atoms in Mg(OH)2
Answer:
Explanation:
There are 2.
Compare and contrast the mass of the object to the size of the object.
A solution contains 9.25x103 M copper(II) nitrate and 1.40x102 M manganese(II) acetate. Solid potassium carbonate is added slowly to this mixture.
A. What is the formula of the substance that precipitates first?
B. What is the concentration of carbonate ion when this precipitation first begins?
Answer:
Explanation:
Concentration of Cu⁺² = 9.25 x 10³ M
Concentration of Mn⁺² = 1.4 x 10² M
solubility product of copper carbonate = 7.08 x 10⁻⁹
solubility product of manganese carbonate = 2.24 x 10⁻¹¹
solubility product of later is less so carbonate of manganese will come out first .
B )
[ Mn⁺² ] [ CO₃⁻² ] = 2.24 x 10⁻¹¹
1.4 x 10² [ CO₃⁻² ] = 2.24 x 10⁻¹¹
[ CO₃⁻² ] = 1.6 x 10⁻¹³ .
the concentration of carbonate ion when this precipitation first begins
= 1.6 x 10⁻¹³ M .
If 7.75 L of radon gas is at 1.55 atm and -19 °C, what is the volume at STP?
The volume at STP is 12.9L.
What symptoms are caused by radon gas?
Possible symptoms include shortness of breath (difficulty breathing), a new or worsening cough, pain or tightness in the chest, hoarseness, or trouble swallowing. If you smoke and you know you've been exposed to high levels of radon, it's very important to quit smoking.
What is the primary reason for radon gasoline in the home?It comes from the natural decay of uranium which is determined in nearly all soils. It typically moves up via the floor to the air above and into your private home through cracks and other holes in the basis. your home traps radon inner, which it is able to build up.
Learn more about Radon gas at https://brainly.com/question/1121893
#SPJ2
In a chemical formula or a chemical equation, what is the small number after the element symbol?
Answer:
It's called a subscript.
Explanation:
Subscripts tell you how many atoms of an element are in a compound.
Which type of rock forms when an existing rock changes under extreme pressure and intense heat?
A
igneous
B
sedimentary
C
metamorphic
Answer:
c
Explanation:
metamorphic rocks
Answer:
C. Metamorphic
Explanation:
Describe the process of dimensional analysis and explain why it is so useful in chemical problem solving.
Answer:
Dimensional Analysis (also called Factor-Label Method or the Unit Factor Method) is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value. It is a useful technique.
ADD NOTE
O QUESTION
1. A student notices that the moon is full one evening. Which sequence of moon phases
will the student observe over the next eight days?
O
Full, waxing gibbous, new, waning crescent
O
Full, waning gibbous, first quarter, waning crescent
O
Full, new, waning gibbous
O
Full, waning gibbous, third quarter
CLEAR AL
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