Oxidation number of nitrogen in Hydrazine (N2H4)
2.N + 4.H = 0
2N + 4.1 = 0
2N=-4
N=-2
The measurement 0.41006 gram, rounded to four significant figures, is expressed as... 1) 0.4100 g
2) 0.410 g
3) 0.41 g
4) 0.4101 g
Answer:
option B = 0.410 g
Explanation:
hope this helps have hope i get brainliest
Question 1 (2 points)
Calculate the following and provide the answer rounded off to the correct accuracy.
2.150 x 102 cm + 7.34 x 102 cm - 3.2 x 102 cm
X
Answer Instructions:
– For a decimal, use (.) and not (.).
As
Note: Your answer is assumed to be reduced to the highest power possible.
The solution to the polynomial expression since the power of the variable is in the second degree is 6.29 × 10² cm
What is the power of a variable?The power of a variable refers to the exponent of the variable and the highest power of a variable is the degree to which the variable is being raised. From the information given, the highest power of the variable is a polynomial.
Given that:
[tex]\mathbf{= 2.150 \times 10^2 \ cm + 7.34 \times 10^2 \ cm - 3.2 \times 10^2 \ cm }[/tex]
So, since the exponents are in the same power we are going to add them all together multiplied by their exponent.
i.e.
[tex]\mathbf{= (2.150 + 7.34 - 3.2) \times 10^2\ cm }[/tex]
[tex]\mathbf{= 6.29 \times 10^2\ cm }[/tex]
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Metallic bonds are formed from the sharing of valence electrons.
O A. True
OB. False
SUBMIT
Answer:
A. True
Explanation:
A metallic bond is a type of chemical bond formed between positively charged atoms in which the free electrons are shared among a lattice of cations. In contrast, covalent and ionic bonds form between two discrete atoms. Metallic bonding is the main type of chemical bond that forms between metal atoms.
What is h+ concentrate in a solution with a pH of 1.25 round to nearest hundredth
Answer:
0.0562
Explanation:
Ph=-log[H+]
to find the h+ is the antilogarithm of the Ph.
Which is 10 raised to the power - Ph.
Answer:
5.62
-2
Explanation:
What is the H+ concentration in a solution with a pH of 1.25? Round to the nearest hundredth.
5.62 × 10n M n= -2
3.4 For each of the following elements, locate it in the Periodic Table, and indicate whether it is a metal, metalloid, or non-metal. (3) 4.4.1 Germanium (Ge) 4.4.2 Selenium (Se) 4.4.3 Beryllium (Be)
According to its location in the periodic table:
Ge: Period 4, Group 14. Metalloid.Se: Period 4, Group 6, Non-metal.Be: Period 2, Group 2, Metal.What is a periodic table?It is a table in which elements are ordered in Groups (columns) and Periods (rows).
According to their ubication and properties they can be classified in:
Metals: occupy the left and center of the table.Metalloids: occupy the right of the table (dark green in the attached table).Non-metals: occupy the right of the table (yellow and light green in the attached image).Let's locate and classify the following elements:
Germanium: Period 4, Group 14. Metalloid.Selenium: Period 4, Group 6, Non-metal.Beryllium: Period 2, Group 2, Metal.Learn more about the periodic table here: https://brainly.com/question/14514242
20 L of nitrogen gas are collected at a temperature of 50°C and 2 atm. How many grams of nitrogen gas were collected?
Answer:
0.1077 grams
Explanation:
First we will employ the ideal gas law to determine the number of moles of nitrogen gas.
PV=nRT
P=2 atm
V=20L
R=0.08206*L*atm*mol^-1*K^-1
T=323.15 K
Thus, 2atm*20L=n*0.08206*L*atm*mol^-1*K^-1*323.15K
K, atm, and L cancels out. Thus n=2*20mol/0.08206*323.15=1.5 moles
Lastly, we must convert the number of moles to grams. This can be done by dividing the number of moles by the molar mass of nitrogen gas, which is 14 grams.
1.5/14=0.1077 grams
Which of the following is a valid mole ratio from the balanced equation 2Fe2O3 + 3C --> 4Fe + 3CO2?
2 mol Fe2O3
4 mol Fe
4 mol C
3 mol Fe
2 mol Fe2O3
4 mol C
3 mol C
4 mol CO2
Answer:
From the given balanced equation, the valid mole ratio is four moles of Fe over 3 moles of moles of c02..
Explanation:
Mole ratio can be defined as the ratio of mole compound with the another.
Which of the following is NOT an example of potential energy?
A. Gravitational pull C. Chemical Bonds
B. Nuclear energy D. Electricity
Answer:
Answer C
Explanation:
Chemical Bonds
Calculate the mass of NaCO3 used in experiment. SHOW WORK — 15 points!!
Mass of empty evaporating dish: 46.233g
Mass of evaporating dish + sodium bicarbonate: 48.230g
Mass of evaporating dish + product after 1st drying: 47.504 g
Mass of evaporating dish: 46.233g
Mass of evaporating dish + product after 2nd drying: 47.485
The mass of sodium bicarbonate (NaHCO₃) used in the experiment is 1.997 g
Calculating massFrom the question we are to calculate the mass of NaHCO₃ (sodium bicarbonate) used in the experiment
From the given information
Mass of empty evaporating dish = 46.233g
Mass of evaporating dish + Sodium bicarbonate = 48.230g
∴ Mass of sodium bicarbonate (NaHCO₃) = [Mass of evaporating dish + Sodium bicarbonate] - [Mass of empty evaporating dish]
Mass of sodium bicarbonate (NaHCO₃) = 48.230g - 46.233g
Mass of sodium bicarbonate (NaHCO₃) = 1.997 g
Hence, the mass of sodium bicarbonate (NaHCO₃) used in the experiment is 1.997 g
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An atom of lead has a mass of 17.6 times greater than the mass of an atom of carbon-12. What is the molar mass of this isotope of lead?
Answer:
211.2g/mol
Explanation:
[tex]mass \: of \: carbon = 12 \\ mass \: of \: lead = 12(17.6) \\ = 211.2gmol {}^{ - 1} [/tex]
What is the difference between weight and mass?
a
Mass depends on gravity and weight depends on the amount of matter.
b
Mass depends on electrons and weight depends on pounds.
c
Mass depends on the amount of matter and weight depends on gravity and mass.
d
Mass depends on pounds and weight depends on electrons.
Answer:
It's C. Mass Depends on the amount of matter and weight depends on gravity and mass.
Explanation:
Hope this helps
Is glycosphingolipid and Sphingomyelin same?
Answer:
Yes, they are same
Explanation:
Glycosphingolipids are a subtype of glycolipids containing the amino alcohol sphingosine. They may be considered as sphingolipids with an attached carbohydrate. Glycosphingolipids are a group of lipids (more specifically, sphingolipids) and are a part of the cell membrane.
Answer:
glycosphingolipid is an example of sphingomyelin
If you were to classify a newly discovered animal, what would you want to know first?
Does it live on land or in the sea?
Does it have a backbone?
Does it have hair?
Does it have vascular tissue?
Answer:
A
Does it live on land or sea.
Answer:
C:
I would check that does it have hair or not because hair provides info about the DNA which can help me if that specific animal has evolved from DNA of any other animal..
Hope it helped you.
Which reaction represents a nuclear reaction?
CO2+H2O→H2CO3
2Na+Cl2→2NaCl
92238U→90234Th+24He2+
2H2O2→2H2+O2
92238U→90234Th+24He2 is a Niclear reaction
Nuclear reaction involves Nuclear elements.
It is usually defined as spontaneous emission of electrons.
Uranium 238 is a nuclear element
The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
What is a nuclear reaction?A nuclear reaction is a process whereby two nuclei collide to form one or more nuclides. There are 4 different types of nuclear reaction and they are ;
FissionFusionNuclear decayTransmutationUranium 238 is a nuclear element therefore the reaction involving Uranium 238 is a nuclear reaction.
Hence we can conclude that The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
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There are 7 named classes of hazardous materials.
O True
O False
False, there are 9 named classes of hazardous materials.
What are hazardous materials?Hazardous materials are substances or chemicals that pose a health hazard, a physical hazard, or harm to the environment.
There are 9 hazardous substances symbols you need to know: flammable, oxidising, explosives, gas under pressure, toxic, serious health hazard, health hazard, corrosive and environmental hazard.
Hence, the statement is false.
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6. How many molecules of ammonia are present in 34 g of ammonia (Formula = NH3)?
What is the molarity of a solution formed from 0.625 moles of NaCl with a total volume of 250 mL
Answer:
2.5 M
Explanation:
.625 M / .250 Liter = 2.5 M
Use the molar volume to calculate the number of moles of CO2 in 4.00L of CO2 gas at STP.
The number of moles will be 0.178 moles. It can be calculated by ideal gas law.
What is ideal gas law?The ideal gas law gave the relationship between pressure, volume as well as temperature. It can be expressed as:
PV =nRT
Where, P is pressure, V is volume and T is temperature.
Calculation of number of moles by using ideal gas law.
Put the value of given data in above ideal gas law formula.
n = PV / RT
n = (1 atom × 4 L)/ (0.0821 × 273 K
n = 0.178 moles.
Therefore, the number of moles will be 0.178 moles.
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what is packing fraction ?
state the formula used to calculate it.
thankyou ~
Answer:
please mark me brainliestExplanation:
Packing fraction is defined as a way of expressing the variation of isotopic mass from whole mass number (atomic mass). This fraction can have positive or can have negative sign. A positive packing fraction describes a tendency towards instability.The equation for packing fraction is: Packing fraction = (N atoms) x (V atom) / V unit cell. N atoms is the number of atoms in a unit cell. V atom is the volume of the atom, and V unit cell is the volume of a unit cell. Substitute the number of atoms per unit cell into the equation.Does combining the glue and water create a physical or chemical change?
The combination of glue and water creates a physical change rather than a chemical change.
Physical and chemical changesPhysical changes are changes to the physical properties of materials and are usually reversible.
Chemical changes, on the other hand, are changes to the chemical properties of materials and are usually irreversible.
Mixing water with glue will only result in the glue being diluted with water and creates no chemical reaction. The glue can be recovered by distilling off the water.
Thus, mixing glues with water is only a physical change as the chemical properties of the glue remain intact.
More on physical and chemical changes can be found here: https://brainly.com/question/11321843
Name the following iconic compounds of Ca3(PO4)2
Answer:
ca2+ and po3+
Explanation:
these ions are formed after the dissociation of the compound
2. What are the main processes by which metamorphic rock is created?
erosion and deposition
melting and volcanic activity
erosion and heat
heat and pressure
Mass of 1.5 mole electron is
Mass of 1.5 mole of electron is 0.8229 mg
mass of electron = 9.11 * 10^-31 kg
mass of 1 mole of any substance ( Avagadro number ) = 6.022 * 10^23 /mol
1.5 moles of electron = 1.5 * 6.022 * 10^23 = 9.033 * 10^23 /mol
mass of 1.5 mole of electron = 9.033 * 10^23 * 9.11 * 10^-31
mass of 1.5 mole of electron = 8.229 * 10^-7 kg
mass of 1.5 mole of electron = 8.229 * 10^-4 g
mass of 1.5 mole of electron = 0.8229 mg
Hope it helps.....
A 100g piece of iron at 150oC is emersed in 268.5 g of water at 20oC. the temperature of both iron and water became 25oC. If the specific heat of iron is 0.449 J/g.K, find the specific heat of water?
Answer:
cW = 4.2J/g.k
Explanation:
Heat gained = Heat lost
iron(mc∆€) = water(mc∆€)
mi= 100g
ci = 0.449
∆€i= 150-25 = 125
...
mw= 268.5g
cw = ?
∆€w=25-20 = 5
...
100×0.449×125= 268.5×cw×5
5612.5= 1342.5cw
cw = 5612.5/1342.5
cw= 4.18 ~ 4.2J/g.K
list three differences between liquids and gases
Answer:
Gas:
- No fixed shape or volume
- Molecules are very loosely packed
- Flows in all the directions
Liquid:
- No fixed shape but has volume
- Molecules are closely packed
- Always flows from higher to lower level
How many atoms of oxygen are present: 3Al2(SO4)3
a. 36
b. 12
c. 10
d. 24
Answer:
the answer is 12
Explanation:
In one formula unit of Al2(SO4)3 A l 2 ( S O 4 ) 3 , there would be twelve atoms of oxygen.
13. Subtract 0.291 from 0.4
I need a breakdown of the answer?
-0.109 is the answer :)
You could basically just do column subtraction
1.) Explain the difference between weather and climate.
2.) Why is latitude a factor in the uneven heating of Earth's surface?
3.) A particular air mass contains extremely cold, dry air. Based on this information, how would this air mass most likely be classified?
4.) What's the intertropical convergence zone (ITCZ)?
5.) How do polar jet streams differ from tropical jet streams?
:::::::::::::::::::::::::::::::::::::::::::::::: Answers::::::::::::::::::::::::::::::::::::::::::::::
1.) Weather refers to temporary atmospheric conditions that are occurring at a given point and time. Climate refers to the average weather conditions that occur in an area over an extended period.
2.) Regions nearer the equator receive sunlight more directly than regions located farther from the equator. As a result, regions near the equator experience warm temperatures all year. Regions located farther from the equator experience more temperature fluctuations.
3.) An air mass containing extremely cold, dry air would likely be classified as a continental arctic (cA) air mass.
4.) The ITCZ is the point at which trade winds from the Northern Hemisphere converge with trade winds from the Southern Hemisphere. This area typically experiences calm weather.
5.) Polar jet streams occur at higher latitudes. They separate the polar easterlies from the prevailing westerlies. Tropical jet streams occur at lower latitudes. They separate the trade winds from the prevailing westerlies.
why did u gave answer before
Explanation:
1) Weather refers to temporary atmospheric conditions that are occurring at a given point and time. Climate refers to the average weather conditions that occur in an area over an extended period.
2) Regions nearer the equator receives sunlight more directly than regions located farther from the equator. As a result, regions near the equator experience warm temperatures all year. Regions located farther from the equator experience more temperature fluctuations.
3) An air mass containing extremely cold, dry air would likely be classified as a continental arctic air mass.
4) The ITCZ is the point at which trade winds from the Northern Hemisphere converge with trade winds from the Southern Hemisphere. This area typically experiences calm weather.
5) Polar jet streams occur at higher latitudes. They separate the polar easterlies from the prevailing westerlies. Tropical jet streams occur at lower latitudes. They separate the trade winds from the prevailing westerlies.
Which part of the water cycle helps to cool the temperature the most?
runoff
infiltration
rainfall
evaporation ( Science )
