Answer:
A. Arsenic
Explanation:
Arsenic is a metalloid. Arsenic has properties of both metals and non-metals that is why it is a metalloid.
Potassium, chlorine, and indium do not have both properties of metals and non-metals, therefore they are not metalloids.
Answer: A
Explanation: have a nice day
What type of nuclear decay is shown by the reaction below?
2390 → He + 23% Th
O A. Fusion
B. Alpha
C. Beta
D. Gamma
Answer:
B. Alpha
Explanation:
Alpha decays always split into an element and He.
Beta decays always split into an element and e- (eletrons).
Gamma decays always split into an element and radiation.
hi:) how to do question 3?:)
Answer:
5
Explanation:
Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5
Answer:
A) 5
Explanation:
5
The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5
Sodium reacts with oxygen to produce sodium oxide.
4Na(s) + O2(g) - - 2Na2O(s)
a. How many grams of Na20 are produced when 57.5 g of Na
reacts ?
b. If you have 18.0 g of Na, how many grams of O2 are
required for reaction?
c. How many grams of O2 are needed in a reaction that
produces 75.0 g of Na2O?
Answer:
Explanation:
a )
4Na(s) + O₂(g) - - 2Na₂O(s)
4 x 23g 32g 2x62
92 g of Na produces 124 g of Na₂O(s)
57.5 g of Na produces (124 / 92) x 57.5
= 77.5 g of Na₂O(s)
b )
92 g of Na requires 32 g of O₂
18 g of Na requires ( 32 / 92 ) x 18
= 6.26 g of O₂
c )
128 g of Na₂O(s) requires 32 g of O₂
75 g of Na₂O(s) requires ( 32 / 128 ) x 75
= 18.75 g of O₂
Calculate the mass (in grams) of hydrogen gas produced when 33.61 g of
diborane (B2H) reacts with excess water.
B Holg) + 6H2O(1)→ 2 H3B03(s) + 6H2(g)
Only enter numerical value without units.
Answer:
14.40g of H2
Explanation:
The balanced equation for the reaction is given below:
B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)
Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol
Mass of B2H6 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 6 x 2 = 12g
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.
Therefore, 14.40g of H2 were produced from the reaction.
Which compound is used to make asphalt? a saturated hydrocarbon that has more than 35 carbons in its chain a saturated hydrocarbon that has between 17 and 35 carbons in its chain a saturated hydrocarbon that has between 5 and 8 carbons in its chain a saturated hydrocarbon that has between 1 and 2 carbons in its chain
Answer:
answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain
Explanation:
edge in 2020 :)
The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.
What is asphalt?Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.
Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.
Hence it is a saturated hydrocarbon that has more than 35 carbons.
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Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
How many grams of carbon dioxide does a hummingbird emit daily?
Answer:
3.5 g CO2
Explanation:
A hummingbird emits up to 3.5 grams of CO2 a day.
Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)
=3.5 grams
Hope this helps!
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
o physical change because even though the change caused the temperature of the water to
increase, the water's physical properties remained exactly the same
o physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
O chemical change because a temperature change was observed, which indicated that the water
was transformed into a different substance
Answer:
O chemical change because a temperature change was observed, which indicated that the water
Explanation:
I have taken this class
What trend does electronegativity follow,going down the periodic table?
Answer:
The answer is option C.
Hope this helps you
PLEASE HELP ASAP Florida is bordered by water on three sides. Which property of water helps moderate Florida’s coastal areas?
• low specific heat, which results in fast, large changes in water temperature
• high specific heat, which results in fast, large changes in water temperature
• low specific heat, which results in slow, small changes in water temperature
• high specific heat, which results in slow, small changes in water temperature
Answer:
i think its d
Explanation:
Answer:
High specific heat, which results in slow, small changes in water temperature
Explanation:
Just did it on Edge
The porticos inside a ballon are experiencing increase in average
Answer:
The porticos inside a ballon are experiencing increase in average
The products of a reaction are NaCl and H2O. What does the law of conservation of matter reveal about the reactants in the reaction? A. At least some of the reactants will include NaCl and H2O. B. The reactants will contain only Na, Cl, O, and H in some amounts. C. Na, Cl, O, H, and three other elements were the reactant elements. D. The reactants will have one Na, one Cl, one O, and two H atoms.
Answer:
D
Explanation:
total mass should be equal on both sides
it's a double do displacement reaction
HCl + NaOH --> NaCl + H2O
Which statement describes an effect of large asteroid and comet impacts?
Answer:
They could cause an organism and population and species to die.
Explanation:
If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides
Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
Answer: Compound
Explanation: pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
For each item, choose whether the change is a physical change or a chemical change.
exploding firecracker:
mowing grass:
breaking a window:
spreading butter on toast:
burning wood in a fireplace:
acid rain corroding gravestones:
Answer:
Explanation:
Exploding Firecracker - Chemical Change
Mowing Grass - Physical Change
Breaking a Window - Physical Change
Spreading butter on toast - Physical Change
burning wood in a fireplace - Chemical Change
acid rain corroding gravestones: Chemical Change
In a physical change, the chemical composition is not altered, easily reversible and no new substance is formed.
In a chemical change, the chemical composition of the substance is altered. Not reversible and a new substance is always formed at the end of the reaction.
what’s that mass of 7.14 X 102 mol of PC13
Answer:
16.25 x 10^-20g
Explanation:
molar mass of PCl3
31(1)+3(35.5) = 137.5
n= mass/molar mass
7.14 x 10² = mass / 137.5
mass = 7.14 x 10² x 137.5
mass = 98175g
Determine the new pressure of a sample of hydrogen gas if the volume and moles are constant, the initial pressure is 6.0 atm, and it is heated from 15°C to 30.°C. PLEASE HELP ASAP! THANK U SO MUCH!
6.3 atm
5.7 atm
12 atm
3.0 atm
Answer:
6.3 atm.
Explanation:
Data obtained from the question include:
Initial pressure (P1) = 6 atm
Initial temperature (T1) = 15°C = 15°C + 273 = 288K
Final temperature (T2) = 30°C = 30°C + 273 = 303K
Final pressure (P2) =..?
Since the volume and number of mole of the hydrogen gas sample is constant, the following equation will used to obtain the new pressure:
P1/T1 = P2/T2
6/288 = P2 /303
Cross multiply
288 x P2 = 6 x 303
Divide both side by 288
P2 = (6 x 303) /288
P2 = 6.3 atm
Therefore, the new pressure of the hydrogen gas sample is 6.3 atm.
Bi-S bond is relatively more stronger than Bi-N bond. How can you explain this with HSAB concept?
Answer:
A qualitative correlation between the extent of interaction between various Lewis acids and bases has been achieved by classifying the acids or bases into two classes: hard and soft in his theory of Hard and Soft Acids and Bases – HSAB. Acid-base reactions are then treated by the general principle that hard acids prefer to combine with hard bases and soft acids prefer to combine with soft bases (and vice versa). The criterion of hardness (or softness) is ascribed to the “hardness” of the electron cloud associated with any species. A firmly held electron-cloud with low polarizability makes a species “hard”, while an easily polarizable electron cloud characterizes the species as “soft”. A third category with intermediate character appears in the borderline.
Based on this information, tell us your best guess.
The Bi-S bond has been relatively stronger than the Bi-N bonds, as Bi has been a hard acid, and it combines more strongly with a hard base that is S.
The HSAB concept has been the hard and soft acid and base concept. The concept has also been termed the Pearson acid and base concept.
According to the concept, hard acids preferred to combine with the hard bases, and soft acids prefer to be combined with the soft bases. The concept gives the idea of the stability of the compounds.
The hard acids are the low electronegative, small ionic radius elements, while soft acids are large ionic radius, high positive charge.
The hard bases are the elements with a small radius and high electronegativity, while soft bases are the elements with a large ionic radius and high polarizability.
The given elements have been:
The Bi has been a hard acid.N has been a borderline base.S has been a hard base.Since hard acid tends to bond with a hard base, Bi tends to bond more strongly with S than N. Thus, the Bi-S bond has been stronger than the Bi-N bond.
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Bird wings and dragonfly wings are both used for flight.
Answer:
Yes
Explanation:
What's the question?
Answer:
yes, they both use it to fllight.
Explanation:
As they are adapted to flight to various places to catch their prey and be safe from various type of harms.
hope it helps..
Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 +3C0 —> 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:
D. For every mole of iron oxide consumed, 2 moles od iron are produced.
Explanation:
(1)Fe2O3 + 3CO → 2Fe + 3CO21 mol of iron oxide, is made up of 2 iron molecules and 3 oxygen molecules. In a balanced equation, both sides of the equation all of the molecules in the 1st half have to be included in the 2nd half of the equation as well.
Answer:
D. For every mole of iron oxide consumed, 2 moles od iron are produced.
Explanation:
How many hours does it take to form 15.0 L of Oz measured at 750
torr and 30°C from water by passing 1.15 A of current through an
electrolytic cell?
Answer:
55.7 hrs
Explanation:
We'll begin by calculating the number of mole of O2 produced during the process. This can be obtained as follow:
Volume (V) = 15L
Pressure (P) = 750torr = 750/760 = 0.99atm
Temperature (T) = 30°C = 30°C + 273 = 303K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
PV = nRT
0.99 x 15 = n x 0.0821 x 303
Divide both side by 0.0821 x 303
n = (0.99 x 15 ) /(0.0821 x 303)
n = 0.597 mole
Next, we shall determine the quantity of electricity required to liberate 1 mole of O2. This is illustrated below:
2O^2- + 4e —> O2
Thus, 4 moles of electron (e) is needed to produce 1 mole of O2.
Recall:
1 electron (e) = 1 Faraday = 96500C
1e = 96500C
Therefore, 4e = 4 x 96500C = 386000C.
Therefore, 386000C of electricity is required to liberate 1 mole of O2.
Next, we shall determine the quantity of electricity required to liberate 0.597 mole of O2.
This is illustrated below:
From the balanced equation above,
386000C of electricity is required to liberate 1 mole of O2.
Therefore, XC of electricity will be required to liberate 0.597 mole of O2 i.e
XC of electricity = 386000 x 0.597
XC of electricity = 230442C
Therefore, 230442C of electricity is needed to liberate 0.597 mole of O2.
Now, we can obtain the time taken to produce 0.597 mole of O2 as follow:
Current (I) = 1.15A
Quantity of electricity (Q) = 230442C
Time (t) =.?
Q = It
230442 = 1.15 x t
Divide both side by 1.15
t = 230442/1.15
t = 200384.35 secs
Finally, we shall convert 200384.35 secs to hours. This is illustrated below:
3600 secs = 1 hr
Therefore, 200384.35 secs = 200384.35/3600 = 55.7 hrs
Therefore, it will take 55.7 hrs to produce 15L of O2.
How can we tell the difference between gases like hydrogen, oxygen, and carbon dioxide cause they all look to same?
Answer:
The critical chemical difference is that CO2 contains one atom of carbon and two atoms of oxygen, whilst CO has one carbon and one oxygen atom.
Scientific evidence shows that Earth's diameter, and thus overall size, does.
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
U
C. Contracting Earth
D. Continental drift
SUBMIT
Answer:
Expanding earth and contracting earth
Explanation:
Answer:
A and C
Explanation:
A bomb calorimeter has a heat capacity of 3.82 kJ/°C. A sample of cinnamaldehyde is ignited in the calorimeter, resulting in a temperature increase from 24.53°C to 31.23°C. How much heat was created by the combustion of cinnamaldehyde?
Answer:
THE HEAT CREATED BY THE COMBUSTION OF THE CINNAMALDEHYDE IS 25.594 JOULES.
Explanation:
When heat capacity of a substance is given, the heat evolved or used up in the process is the multiplication of the heat capacity and the temperature difference.
Heat = Heat capacity * change in temperature
Heat capacity = 3.82 kJ/°C
Change in temperature = 31.23 C - 24.53 C = 6.7 °C
So therefore, the heat created by the combustion of the cinnamaldehyde is:
Heat = 3.82 * 6.7
Heat = 25.594 Joules
In conclusion, 25.594 J of heat is created from the combustion of cinnamaldehyde
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
A)The fireworks produce colors.
B)The fireworks give off heat.
C)Igniting the fireworks requires energy
D)Igniting the fireworks makes an odor.
Answer:B
Explanation:
TOOK DA TEST
As the firework releases heat, it is considered as exothermic reaction. The correct option is B.
What is exothermic reaction?An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.
Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.
Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.
Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.
Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.
As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.
Thus, the correct option is B.
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To draw a Lewis structure for a polyatomic ion, begin by calculating A, the available electrons, and N, the needed electrons. What is N for CIO3-, the chlorate ion?
Answer:
N for chlorate ion is one
Explanation:
Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons
Answer: 26
Correct Answer
how many bonds are present in NCl3
You are performing an
experiment in your lab. To
compare with other experiments
your results must be in moles.
During your final step you burn a
strip of magnesium (Mg), which
results in 187 grams of
magnesium oxide (MgO). How
should you enter your results?
PSP
O
A. 7.7 moles Mgo
B. 4.6 moles Mgo
C. 187 grams Mgo
D. 7536.1 moles Mgo
Resot Selection
Answer:
4.6 moles MgO
Explanation:
number of moles is equals to the mass in grams divided by RFM
RFM=16+24.3=40.3
187/40.3
=4.6 moles of MgO
During your final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
What are moles?The value of one mole is given by Avogadro's number which is 2.303 × 10²³ moles but here the used weight is given so number of moles will be calculated with other formula.
A strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) number of moles will be,
n = W / M
where , n = number of moles
W = given weight
M = molar mass
substituting the values in equation,
n = 187 / 40.30
n = 4.6 moles
Therefore, final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
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In which two places is aggregate generally found? A.floodplains and alluvial fans B.alluvial fans and mines C.mines and beneath the topsoil D.beneath the topsoil and above the topsoil ED2020
Answer:
A.floodplains and alluvial fans .
Explanation:
Hope it helps.
Answer:A)
Explanation:
what’s the mass of 0.0485 moles of Na2CO3
Answer:5.1g
Explanation:number of moles of Na2co3 is 0.0485 and it molar mass = 23×2+12+16×3=106
n=m/M
Therefore m= n×M
m= 0.0485×106
=5.141g
The mass of 0.0485 moles of Na2CO3 of 5.141 grams.
What is mass?Mass is defined as a dimensionless number used to describe the mass of a particle or item. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit. Mass is a physical body's total amount of matter. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial.
Mass can be calculated as
Mass = molar mass x number of moles
Molar mass = 23 x 2 + 12 + 16 x 3
= 106 grams
Mass = 106 x 0.0485
= 5.141 grams
Thus, the mass of 0.0485 moles of Na2CO3 of 5.141 grams.
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