Answer:
The porticos inside a ballon are experiencing increase in average
seasonal variation in Earth's climate are caused by
a Earth's rotation
b Earth's tilt
c Earth's magnetic field
d Earth's precession
Answer: B: Earths tilt
Explanation:
Seasonal variation occurs because the Earth is tilted on its axis by 23.5˚. As Earth orbits the sun, its orientation to the sun changes.
Balance each of the following chemical equations:
a. N2(g) + O2(g) → NO(g)
b. HgO(s) = Hg(l) + O2(8)
c. Fe(s) + O2(g) →→ Fe2O3(s)
d. Na(s) + Cl2(g) →→ NaCl(s)
e. Cu2O(s) + O2(g)
→ CuO(s)
Answer:
a. N₂(g) + O₂(g) → 2 NO(g)
b. 2 HgO(s) → 2 Hg(l) + O₂(g)
c. 4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)
d. 2 Na(s) + Cl2(g) → 2 NaCl(s)
e. 2 Cu₂O(s) + O₂(g) → 4 CuO(s)
Hope this helps.
a compound contains 28.6 magnesium 14.3 carbon 57.1 oxygen what is the empirical formula
Answer:
Option 3
[tex]MgCO_{3}[/tex]
Explanation:
These are the steps for empirical forumla
1) If given percentage, assume everything in grams
2) Convert those grams to moles (using specific molar mass of each unique element)
3) Divide all the moles by the smallest mole you discovered.
4) Answer will be close to a whole number for each element and that's the answer.
First step, 28.6 g Mg, 14.3 g C, 57.1 g O
Second step:
28.6/24.305 = 1.1767 Mg
14.3/12.01= 1.1907 C
57.1/16.00 = 3.5688 O
Third step:
1.1767/1.1767 = 1 Mg
1.1907//1.1767 ~ 1 C
3.5688/1.1767 ~ 3 O
Put everything together you get!
[tex]MgCO_{3}[/tex]
The empirical formula for the compound is:
C. [tex]MgCO_3[/tex].
What is an Empirical formula?A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule.
Given:
28.6 g Mg, 14.3 g C, 57.1 g O
In order to determine empirical formula we will divide mass of each given element with the molar mass of the respective element.
[tex]\frac{28.6}{24.305} = 1.1767 Mg[/tex]
[tex]\frac{14.3}{12.01}= 1.1907 C[/tex]
[tex]\frac{57.1}{16.00} = 3.5688 O[/tex]
Dividing each mass with the lowest mass:
[tex]\frac{1.1767}{1.1767 } = 1 Mg[/tex]
[tex]\frac{1.1907}{1.1767 } = 1 C[/tex]
[tex]\frac{3.5688}{1.1767} =3 O[/tex]
Thus, the empirical formula for the compound is [tex]MgCO_3[/tex].
Therefore, option C is correct.
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In an lonie lattice:
A atoms are bonded to four others in a
Tetrahedral shapes
atoma are packed together in a
regular euble arrangement
e. atoms are bonded with a single
bonds and one double bond
D. atoms are structured in a vast
network of atoms
Reset Selection
Answer:
atoms are bonded with a single bond one double bond
For the galvanic (voltaic) cell Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s) (E°= 0.77 V at 25°C), what is [Fe2+] if [Mn2+] = 0.040 M and E = 0.78 V?
Assume T is 298 K
Answer:
0.01836 M
Explanation:
Again the reaction equation is;
Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)
E°cell= 0.77 V
Ecell= 0.78 V
[Mn2+] = 0.040 M
[Fe2+] = the unknown
n=2
From Nernst's equation;
Ecell= E°cell- 0.0592/n log Q
0.78= 0.77 - 0.0592/2 log [Fe2+] /[0.040]
0.78-0.77= - 0.0592/2 log [Fe2+] /[0.040]
0.01/ -0.0296= log [Fe2+] /[0.040]
-0.3378= log [Fe2+] /[0.040]
Antilog(-0.3378) = [Fe2+] /[0.040]
0.459= [Fe2+] /[0.040]
[Fe2+] = 0.459 × 0.040
[Fe2+] = 0.01836 M
The Fe ion concentration in the galvanic cell has been 0.0186 M.
The Nernst equation has been used for the determination of the voltage of the galvanic cell.
It can be given as:
[tex]\rm E_c_e_l_l\;=\;E_0\;-\;\dfrac{0.059}{n}\;\times\;log\;\dfrac{[Fe^+]}{[Mn^2^+]}[/tex]
where, n = number of electrons transfer = 2
[tex]\rm E_0[/tex] = initial voltage = 0.77 V
[tex]\rm E_c_e_l_l[/tex] = cell voltage = 0.78 V
Iron ion concentration = 0.040 M
Susbstituting the values:
0.78 = 0.77 - [tex]\rm \dfrac{0.059}{2}\;\times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]
0.78 - 0.77 = -0.0296 [tex]\rm \times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]
-0.03378 = [tex]\rm log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]
antilog (-0.03378) = [tex]\rm \dfrac{[Fe^2^+]}{0.040}[/tex]
Iron ion concentration = 0.0186 M
Thus, the Fe ion concentration in the galvanic cell has been 0.0186 M.
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All of the following are units for pressure except _____. A. Pa B. psi C. atm D. Hg
Answer:
B. psi
Explanation:
Pa is Pascal
atm is atmosphere
Hg is Mercury
hope it helps.
You should think critically about scientific evidence supporting product claims because _____. A. there is no comparison group B. the product has been evaluated by a reliable source C. the information may be distorted in order to sell more D. there could be another product that is a better value for the money
Answer:
The correct answer is C. Plz mark brainiest
Explanation:
hello:) is hydrogen chloride and hydrochloride acid the same??
Answer:
No because hydrogen chloride is gas and hydrochloric acid is (as stated in the name) an acid. The formula for hydrogen chloride is HCI(g), the little g states that the compound is a gas and the formula for hydrochloric acid is HCl(aq) and the little aq means aqueous.
Answer:
no. they are not the same
Explanation: Although, they both do have the same chemical formula HCL, they differ in their states of matter. Hydrogen chloride is a gas whereas hydrochloric acid is a solution of hydrogen chloride gas and water( creates an aquaeous solution). Hydrochloric acid is highly corrossive.
A chemical reaction has the equation 2AgNO3 (aq) + Zn (s) —> 2Ag (s) + Zn(NO3)2 (aq). What type of reaction occurs between AgNo3 and Zn?
A. Synthesis
B. Double displacement
C. Decomposition
D. Single displacement
how many dots would go around xenon in electron dot diagram
Answer:
8
Explanation:
Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.
What does percent composition tell you about a molecule?
O A. It tells you the ratio of elements in the molecular formula.
O B. It tells you how the elements are arranged in the molecule.
O C. It gives you the total number of atoms in the molecule.
D. It tells you how much of a molecule is made up of each element.
Elements with an oxidation number of 2 include which of the following?
Check all that apply.<<<
O A. Lithium
B. Magnesium
C. Potassium
D. Calcium
Answer:
b-Mg
d-Ca
Explanation:
all the group two metals have oxidation of 2
Answer:
Calcium , Magnesium
Explanation:
APEX
The table compares the number of subatomic particles in two atoms. Subatomic Particle Comparison
Atom Protons Electrons Neutrons
Q 11 11 12 R 11 10 12
Which of the following is true about the two atoms?
a) They have the same charge and same mass.
b) They have the same charge but different masses.
c) They have different charges but the same mass.
d)They have different charges and different masses.
Answer:
c) They have different charges but the same mass.
Explanation:
The atoms have a different charge from each other because one atom has one more electron than the other. They have the same mass because the number of protons and neutrons are the same in both atoms.
The given atoms have different charges and masses. So the correct option is D.
What is atomic mass?
The amount of matter that makes up an element's atom, or atomic mass. It is stated as a multiple of 1.992646547 × 10⁻²³ grams, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. One atomic mass unit (amu), on this scale, is equal to 1.660539040 × 10⁻²⁴ grams. The dalton (Da) is another name for the atomic mass unit that honors the English chemist John Dalton.
The total mass of the protons, neutrons, and electrons that make up an atom is a little bit less than the observable atomic mass. According to an equation, the energy produced during the combination of these particles is converted into binding energy, which equals the product of the mass (m) spent and the square of the velocity of light in vacuum (c), or E = mc². This discrepancy is known as the mass defect.
Therefore the correct option is D.
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Which indicator shows whether a solution is acidic or basic, but not how strong it is?
a)
pH paper
which turns blue in acids and red in bases.
Ob) pH paper which turns red in acids and blue in bases.
c) Litmus paper which turns red in acids and blue in bases.
d) Litmus paper which turns blue in acids and red in bases.
Answer:
Option C
Explanation:
Litmus paper shows only whether the solution is acidic or basic, but not how strong it is.
=> Base turns the red litmus paper blue
=> Acid turns the blue litmus paper red.
Which two compounds are used in batteries? sulfuric acid and potassium hydroxide, lithium hydroxide and nitric acid, potassium hydroxide and nitric acid ,sulfuric acid and ammonium hydroxide.
Answer:
sulfuric acid and potassium hydroxide is actually the answer, not the girls above me.
Explanation:
EDU SAID SO
The two compounds are used in batteries are sulfuric acid and potassium hydroxide.
What electrolytic compounds present in a batteries?The chemicals present in a different type of batteries are sodium chloride, sulfuric acid, hydrochloric acid, chloric acid, potassium nitrate, nitric acid, sodium hydroxide, magnesium hydroxide and sodium acetate.
To learn more about batteries here.
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The arrows in the chart below represent phase transitions.
Which arrows represent the phase transitions in which heat energy is gained?
1, 2, and 3
2, 3, and 5
3.4. and 5
4.5 and 6
Answer:
a. 1,2,and 3.
Explanation:
When something turns liquid, e.g. metal, you need to heat it. When something turns gas, e.g. water, you need to heat it. And when something goes directly from solid to gas, e.g. dry ice, carbon dioxide, you need to add heat to it. hope this helps! Please mark brainiest.
a. How many moles of C are needed to react with 0.500 mol
of SO?
b. How many moles of CO are produced when 1.2 mol
of C reacts ?
c. How many moles of SO2 are required to produce 0.50 mol
of CS2?
d. How many moles of CS2 are produced when 2.5 mol
of C reacts?
Answer:
A. 1.25 moles of C.
B. 0.96 mole of CO.
C. 1 mole of SO2.
D. 0.5 mole of CS2.
Explanation:
We'll begin by writing the balanced equation for the reaction between carbon, C and sulphur (iv) oxide, SO2.
This is given below:
5C + 2SO2 → CS2 + 4CO
From the balanced equation above,
5 moles of C reacted with 2 moles of SO2 to produce 1 mole of CS2 and 4 moles of CO.
A. Determination of the number of moles of C needed to react with 0.5 mole of SO2.
This can be obtained as follow:
From the balanced equation above,
5 moles of C reacted with 2 moles of SO2.
Therefore, Xmol of C will react with 0.5 mole of SO2 i.e
Xmol of C = (5 x 0.5)/2
Xmol of C = 1.25 mole
Therefore, 1.25 moles of C is needed for the reaction.
B. Determination of the number of moles of CO produced when 1.2 moles
of C reacted.
From the balanced equation above,
5 moles of C reacted to 4 moles of CO.
Therefore, 1.2 moles of C will react to produce = (1.2 x 4)/5 = 0.96 mole of CO.
Therefore, 0.96 mole of CO was obtained from the reaction.
C. Determination of the number of moles of SO2 required to produce 0.50 mole of CS2.
This can be obtained as follow:
From the balanced equation above,
2 moles of SO2 reacted to produce 1 mole of CS2.
Therefore, Xmol of SO2 will react to produce 0.5 mole of CS2 i.e
Xmol of SO2 = (2 x 0.5)/1
Xmol of SO2 = 1 mole.
Therefore, 1 mole of SO2 is needed for the reaction.
D. Determination of the number of moles of CS2 produced when 2.5 moles of C reacted.
From the balanced equation above,
5 moles of C reacted to produce 1 mole of CS2.
Therefore, 2.5 moles of C will react to produce = (2.5 x 1)/5 = 0.5 mole of CS2.
Therefore, 0.5 mole of CS2 was produced from the reaction.
9. A bond formed between a silicon atom and an oxygen atom is likely to be
O polar covalent
O coordinate covalent
O ionic
O nonpolar covalent
The answer is
O ionic
Explanation:
A bond formed between a silicon atom and an oxygen atom is likely to be: ionic
Answer: Polar covalent
Explanation: Gradpoint
PLEASE HELP! Write the full electron configuration for phosphorus, atomic symbol P, then draw an orbital box diagram that accounts for all of the electrons in phosphorus. You don’t need to include the orbital box diagram as part of your answer. Based on your drawing, explain why phosphorus is either paramagnetic or diamagnetic.
Answer:
1) The full electron configuration for phosphorus is 1s²2s²2p⁶3s²3p
2) Phosphorus is paramagnetic
Explanation:
1) To write the electron configuration, we follow the electron filling order, that is starting from 1s, to 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4f, 5s, 5p, 5d, 6s till the electrons are all accounted for (up to 58)
We note that the s orbitals can each take two electrons while the p orbital can take 6 electrons and the d orbital can take 10 electrons
The electron configuration chart for phosphorus, P, is given as follows;
1s²2s²2p⁶3s²3p.
2) Diamagnetism is the temporary magnetism is the magnetism of a material that exists in the presence of a magnetic field due to a a change in the atomic electron orbital motion
Paramagnetism is a magnetism in which a material is weakly attracted by an applied external magnetic field such that there is induced magnetism in the applied magnetic field direction
Paramagnetic materials have have unpaired electrons that give them permanent magnetic moments in the absence of an applied magnetic field as such unpaired electrons are termed paramagnetic electrons and atoms that have one or more unpaired electrons are paramagnetic
Phosphorus, with the 3 partially filled p orbitals have 3 unpaired electrons in their outermost shell giving them the overall properties of a paramagnetic materials.
Which temperature in Celsius (°C) does this thermometer show? –8° 0° 25° 32°
Answer:
0° Celsius
Explanation:
The thermometer shows 0° Celsius which corresponds to 32° F.
Answer:
0 degrees celsius
Explanation:
just did the test
Which of the measurement contain three significant figure?
Answer:
The answer is explained below
Explanation:
The question is not complete.
The correct question should be like:
Which of the measurement contain three significant figure?
500
395
0.001
0.00100
1 × 10⁻³
5 × 10²
Answer:
The following are rules applied when considering significant figures:
i) All digits are significant excluding zero. E.g of significant digits are 1,2,3,4,5,6,7,8,9
ii) Any zero that appear within or after non zero digits are significant e.g. 200, 1004, 500009
iii) Zeros before non zero digits are not significant. An example shows significant digits bolded 001, 0.0012, 001.56
iv) Zeros that come after non zero digits are significant even if the number is in decimal form. An example shows significant digits bolded 1000, 0.001200, 001.5600
Therefore:
500: It contains three significant digits
395: It contains three significant digits
0.001: It contains only one significant digits
0.00100: It contains three significant digits
1 × 10⁻³: 1 × 10⁻³ = 0.001. It contains only one significant digits
5 × 10²: 5 × 10² = 500. It contains three significant digits
The measurements that contain three significant figure are 500, 395, 0.00100 and 5 × 10²
Is boron a metal or non metal or metalloid
Answer: Non Metal
Explanation: Boron. Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements
The rate constant for the first-order decomposition of cyclobutane at 500 °C is 9.2 x 10−3 s−1. How long will it take (in seconds) for 80.0% of a sample of C4H8 to decompose?
The time taken to complete the reaction is 179 seconds.
Rate of reaction?Rate of reaction is the time taken for a reaction to attain completion. From the data presented, we have;
Initial concentration = No
Final concentration = No - (0.8No) = 0.2No
rate constant = 9.2 x 10−3 s−1
time taken = t
Given that;
N =Noe^-kt
0.2No =Noe^-( 9.2 x 10−3 t)
0.2 = e^-( 9.2 x 10−3 t)
ln(0.2) = 9.2 x 10−3 t
t = ln(0.2)/-9.2 x 10−3
t = -1.609/-0.009
t= 179 seconds
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Consider the unbalanced equation for the oxidation of aluminum. _Al + _O2 Right arrow. _Al2O3 Which sequence of coefficients should be placed in the blanks to balance this equation? 2, 3, 1 1, 3, 2 4, 3, 2 3, 2, 3
Answer:
4,3,2
Explanation:
if you balance a chemical equation that is the correct coefficients to be placed in the blank space
Answer:
Coefficients = { 4, 3, 2 }
Explanation:
The previous answer is correct, but I want to show you how to balance this chemical reaction. First take a look at the number of each element present in the reactant and product side -
Reactant | Product
Aluminum = 1 Aluminum = 2
Oxygen = 2 Oxygen = 3
As you can see, if you were to double the aluminum on the reactant side, the reactant and product side with respect to aluminum would be balanced. 2 and 3 share a least common multiple of 6, so if we were to triple the amount of oxygen on the reactant side and double the amount of oxygen on the product side - either side would be balanced!
Now there is one default in this. The number of aluminum and oxygen on the product side are present as the same compound. Let us say we were to still triple the amount of oxygen on the reactant side and double the amount of oxygen on the product side. That would satisfy the oxygens. The chemical equation would then be as such -
Al + 3O2 -----> 2Al2O3
Now let us balance the number of aluminums on either side. There is 1 aluminum on the reactant side, with respect to 4 aluminums on the product side. The coefficient of aluminum on the reactant side should thus be four -
4Al + 3O2 -----> 2Al2O3
Coefficients = { 4, 3, 2 }
What is the mass of a sample of copper that contains 4.78 x 1023 atoms?
Answer:
50.45679
Explanation:
mass of 1 mole(6.02 x 10^23atoms) of copper: 63.546g
so,
63.546g x 4.78 x 10^23 / 6.02 x 10^23 = 50.45679g (you could round this to the nearest decimal if u wish so)
Liquid hydrogen peroxide (H2O2) breaks down into water and oxygen gas.
Answer:
i got ddoxed by skai jackson
Explanation:
it sucked
Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 + 3CO —> 2Fe + 3CO2. What does this tell you
about the relative amounts of iron oxide and iron consumed and produced in this equation?
A. For every two moles of iron oxide consumed, one mole of iron is produced,
B. For every two grams of iron oxide consumed, one gram of iron is produced.
C. For every gram of iron oxide consumed, two grams of iron are produced
D. For every mole of iron oxide consumed, two moles of iron are produced.
Answer:
Option D. For every mole of iron oxide consumed, two moles of iron are produced.
Explanation:
The balanced equation for the reaction is given below:
Fe2O3 + 3CO —> 2Fe + 3CO2
From the balanced equation above,
1 mole of iron oxide, Fe2O3 reacted with 3 moles of carbon monoxide, CO to produce 2 moles of iron, Fe and 3 moles of carbon dioxide, CO2.
Thus, with a careful observation of the equation, we can conclude that for every 1 mole of iron oxide, Fe2O3 consumed, 2 moles of iron, Fe are produced.
The kinetic-molecular theory of gases says A. the particles of a gas move independently of each other. B. the particles in a gas move rapidly. C. the particles in a gas are far apart. D. all of the above.
Answer:
D. all of the above.
Explanation:
The kinetic-molecular theory of gases suggests that; the particles of a gas move independently of each other, the particles in a gas move rapidly, the particles in a gas are far apart.
Hope it helps.
Write the net ionic equation describing the reaction between aluminum metal and Fe3+ ions in solution that produces dissolved Al3+ and Fe2+ ions. Be sure to include all states of matter.
Answer:
Al(s) + Fe³⁺ ----> Al³⁺(aq) + Fe²⁺(aq)
Explanation:
The reaction between aluminium metal with an aqueous solution of Fe³⁺ ions to produce Al³⁺ ions and Fe²⁺ ions is a redox reaction in which the aluminium metal is oxidized while the Fe³⁺ ions are reduced.
Oxidation occurs if the oxidation number of an element or ionic species increases in the positive direction whereas reduction occurs when the oxidation number of the reacting species decreases.
The oxidation number of aluminium increases from 0 to +3 whereas the oxidation number of iron reduces from +3 to =2 in the given reaction.
In a net ionic equation, only the species participating in the reaction are shown.
The equation is given below;
Al(s) + Fe³⁺ ----> Al³⁺(aq) + Fe²⁺(aq)
which activity most contributed to economic interdependence among West African peoples? farming, hurding, textiles, trade.