Answer:
Lithium nitride. Trilithium nitride. 26134-62-3. Lithium nitride (Li3N) Li3N.
How many moles of atoms are in 3.00 g of 13^C?
Answer:
1) 1.39 * 10²³ atoms
Explanation:
Why is partial pressure of oxygen greater at lower levels in water.
Answer:
Therefore, the partial pressure of oxygen at high altitudes is less than at sea level.
Explanation:
The deep ocean thus has higher oxygen because rates of oxygen consumption are low compared with the supply of cold, oxygen-rich deep waters from polar regions. In the surface layers, oxygen is supplied by exchange with the atmosphere.
C2H4NH Lewis structure
NaCl express your answer as an Ion
Does anyone know what the answer for this would be
Answer:
iconic compound
Explanation:
What are the similarities and differences between living on Earth versus living in space?
find 5 points for each section
Answer:
Differences
• Space is everything in the universe beyond the top of Earth's atmosphere - The moon, Stars, Milky way, etc.
• In space, no one can hear you scream. This is because there is no air in space, i.e, it's vacuum.
• Earth is a planet on solar system. It is the only planet where life exists!!
• Earth is also called "blue sky" cause it has 75% water.
Similarities
•They need oxygen for survival: Man, animals in earth and space need oxygen for survival.
•Water is also need to stay alive.
•Food is very paramount to both man, animal s and organisms.
•Shelter, we all ned a place to lay our head in other to be safe.
•Air everywhere in the atmosphere.
•Water, air, food and shelter are available on earth but their availability differs in space.
•Astronaut need to bring everything one need in space with him or her from Earth. They often recycle the things they bring.
Hope it helps :)
The atmospheric conditions in earth and space is entirely different. Therefore the living in earth and space will be far different on many aspects such as adaptations, habits etc.
What are aliens?The living things that are believed to be exists in out of earth is called aliens. Some studies shows that there is a possibility to find exotic species living in space.
The study which deals with aliens is called exo-biology. The atmosphere thus, the presence gases, temperature, pressure, etc. will be different for space from that in the earth.
Hence, aliens may need not the presence of oxygen for living as well as the atmospheric conditions that maintains living in earth will not be there in space.
However, any living irrespective of earth or space need water and some kind of food to survive. Thus the presence of water in some planets opens the way to study the presence of livings there.
To find more on aliens, refer here:
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To make hot cocoa on the trip, you will need to boil water. Construct an
explanation that describes how the lower air pressure in the mountains affects
this process.
i need an answer in under an hour pls help
Answer:
the water in the mountains will take longer to boil, because of the higher atmospheric pressu
2.8 dm3 of gas X at STP has equal mass with 11.2 dm3 of C2H6 at STP. What is
the number of mole if gas X has 30 grams?
Answer: o.125 moles of gas X with a molar mass of 240
Explanation:
2.8 dm3 of gas X at STP has equal mass with 11.2 dm3 of C2H6 at STP. What is the number of mole if gas X has 30 grams?
the molar volume of any gas at STP is the volume of 1 mole at STP
and is 22.4 L
the C2H6 has a volume of 11.2L at STP so it has 0.5 moles
C2H6 has a molar mass of (2 X 12) +(6 X 1) = 24 + 6 = 30
0,5 moles weighs 15 gm at STP with
so 15 gm at STP with 2.8 L for gas X
PV=nRT
P=1 atm
T =273.2k
V =2.8
R =0.082
n = PV/RT = (1 X 2.8)/(0.082 X 273.2) =0.125 moles of gasX
the weight of gas X is 30 gms
so 30/.125 =240 g/mole = molar mass of gas X
5. When argon was discovered, it was placed between chlorine and potassium, even though the periodic
table at that time was organized by increasing atomic weight. Why did scientists choose to place argon
before potassium?
Metallic bonding is...
a
a type of covalent bond.
b
a type of ionic bond.
c
an attraction between positive and negative ions.
d
an attraction between positive ions and electrons.
Answer:
d an attraction between positive ions and electrons
Which compound is an acidic oxide?
Aaluminium oxide
carbon dioxide
copper(II) oxide
magnesium oxide
Answer:
Carbon dioxide
Explanation:
Metal oxides are basic and Non metal.oxides are acidic.
Al, Be, Zn,Sn ,Pb oxides are amphoteric so they show both acidic and basic properties.
From the above answers Al, Cu and Mg are metals so their oxides are acidic while Carbon is a non metal.so CO2 is an acidic oxide
Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?.
Answer:
Silver
Explanation:
Silver has the highest thermal conductivity of any element and the highest light reflectance.
list of charge of elements that do not form compound easily
Answer:
The highlighted words in the explanation.
Explanation:
A clue comes by considering the noble gas elements, the rightmost column of the periodic table. These elements—helium, neon, argon, krypton, xenon, and radon—do not form compounds very easily, which suggests that they are especially stable as lone atoms. What else do the noble gas elements have in common?
-Rutherford's experiment was important because it showed that:
A) Radioactive elements give off alpha particles.
b) A zinc sulfide screen glows when struck by a charged particle.
C) The mass of the atom is uniformly distributed throughout the atom
d) An atom is mostly empty space
Answer: D
Explanation:
1. Why fractional distillation has
fractionating column but not in simple
distillation?
Answer:
fractional distillation leads to better separation
I NEED THE ANSWER ASAP! Its science btw
Which statement describes conditions in which a mineral can form?
A. Crystals of minerals dissolve in the groundwater in caves.
B. Materials dissolved in seawater crystallize on an ocean bottom.
C. Molten materials are cooled in a netalworks factory
D. Materials are mined from deposits deep underground.
Answer:
b
Explanation:
determine the element of lowest atomic number that contains a complete d subshell in the ground state.
Answer:
The element with the lowest atomic number that contains a complete d-subshell in the ground state is copper.Source:
Determine the element of lowest atomic number that contains a complete d subshell in the ground... - Study.comHow do weak intermolecular bond strengths affect the melting and boiling point of a substance?
The melting point is lower, but the boiling point is higher.
Both the melting point and boiling point are lower.
The melting point is higher, but the boiling point is lower.
Both the melting point and boiling point are higher.
Considering the definition of intermolecular bond, the correct answer is second option: Both the melting point and boiling point are lower.
The molecules of covalent compounds can be held together through electrostatic interactions known as "intermolecular forces", which are characterized by holding more than one molecule together. Therefore, they are related to chemical bonds, which have the goal of making molecules stick together or separate.
In other words, intermolecular forces or bonds are those interactions that hold molecules together. These are electrostatic forces.
The presence of these forces explains, for example, the properties of solids and liquids.
They differ from intramolecular forces, because of these, they correspond to interactions that hold the atoms in a molecule together. In general, intermolecular forces are much weaker than intramolecular forces.
On the other side, the melting point is the temperature at which a substance goes from solid to liquid at a given pressure. Similarly, the boiling point is the temperature at which the substance passes from a liquid to a gaseous state.
Finally, the more intense the intermolecular forces, the higher the melting point and the boiling point of a substance because these are the forces that must be overcome to separate them.
In summary, the correct answer is second option: Both the melting point and boiling point are lower.
Learn more:
https://brainly.com/question/4889416?referrer=searchResultshttps://brainly.com/question/25729379?referrer=searchResultsWILL MARK BRAINLIEST
Georgia completed an investigation about different forces and came up with an explanation. What does she need to support her explanation?
Problem
Conclusion
Question
Evidence
Georgia needs evidence
ΕΛΑ
1
a
C
Copper(II) nitrate decomposes on heating. The reaction is endothermic.
2Cu(NO),(s) → 2CuO(s) + 4NO2(g) + 0,(9)
Sketch a reaction pathway diagram for this reaction to include the
activation energy
[3]
b Draw an energy cycle to calculate the standard enthalpy change for
this reaction, using enthalpy changes of formation.
[3]
Calculate the enthalpy change for this reaction using the following
enthalpy changes of formation.
AH, [Cu(NO, ),(s)] = -302.9 kJ mol-'
AH, [CuO(s)] =-157.3 kJ mol-!
AH [NO,(g)] = +33.2 kJ mol-!
[3]
d Copper(II) sulfate is soluble in water. A student dissolved 25.0 g of
copper(II) sulfate in 100 cm of water in a polystyrene beaker stirring
all the time. The temperature of the water fell by 2.9 °C.
i Calculate the enthalpy change of solution of copper(II) sulfate.
(specific heat capacity of water = 4.18 Jg1 °C ; relative
molecular mass of copper(II) sulfate = 249.7 g mol-')
[3]
ii Suggest one source of error in this experiment and explain how
the error affects the results.
[2]
[Total: 14]
This problem provides information about the decomposition of copper(II) nitrate to copper(II) oxide and dinitrogen monoxide; for example, it is endothermic, the enthalpies of formation and the chemical reaction, as well as copper (II) sulfate which when dissolved in water, exhibits a temperature decrease:
[tex]2Cu(NO_3)_2(s) \rightarrow 2CuO(s) + 4NO_2(g) + O_2(g)[/tex]
First of all, we can draw the reaction pathway as shown on the attached figure, by taking into account the positive enthalpy change as it is endothermic, so that the products turn out with higher energy than the reactants, for it to be positive. In addition, keep in mind that top point is the activation energy the reaction needs to take place.
Next, we calculate the enthalpy change for this reaction by using the general formula which subtracts the enthalpy of formation of products and reactants with each species' correct stoichiometric coefficient:
[tex]\Delta H=2\Delta _fH_{CuO}+4\Delta _fH_{NO_2}+\Delta _fH_{O_2}-2\Delta _fH_{Cu(NO_3)_2}[/tex]
So we plug in the given enthalpies of formation:
[tex]\Delta H=2(-157.3)+4(33.2)+(0)-2(-302.9)=424.0 kJ/mol[/tex]
Finally, we go over the calorimetry experiment, whereby the total heat absorbed by the copper(II) sulfate is calculated via the general heat equation, which includes the heat loss from the solution of water and the salt:
[tex]Q_{rxn}=-mC_w\Delta T\\\\Q_{rxn}=-(100+25)g*4.18\frac{J}{g\°C}*-2.9\°C=1515.25J[/tex]
By dividing the previous answer by the moles of salt:
[tex]n=25.0g*\frac{1mol}{249.7g}=0.100mol[/tex]
We can obtain the enthalpy change of solution of the copper salt:
[tex]\Delta _{dissolution}H=\frac{1,515.25J}{0.100mol} \\\\\Delta _{dissolution}H=15,134J/mol=15.1kJ/mol[/tex]
To conclude, it is important to note that one possible source of error is we are assuming the solution has the same specific heat to that of water and that is not necessarily true. Also, we are neglecting any heat transfer to and from the surroundings despite the polystyrene beaker is considered a heat isolator, which means the results cannot necesarilly be accurate and the enthalpy change could have turned out higher or lower in a rigoruous experiment.
Learn more:
https://brainly.com/question/15862043https://brainly.com/question/11667877How does the current flow affect pressure.
Answer:
when less water is flowing
What is the charge for H before electron share?
An H atom is made up of a nucleus with a +1 charge, as well as a single electron. Therefore, the only positively charged ion possible has charge +1.
I hope this helps!
what wouldn't be a redox reaction?
Answer:
Explanation:
Combination of oxidation and reduction reactions.
Where there is oxidation, there is reduction too.
5) When rain falls to the earth, it just doesn't sit there. Instead, the rain water starts moving. Some of the precipitation seeps into the ground to replenishing groundwater. However, most of
it flows downhill as runoff. Runoff is important in filling rivers and lakes, but it also changes the landscape by erosion and can be a powerful mover. Flowing water is a powerful force,
capable of moving boulders and carving out canyons. Runoff has an impact on streams and rivers, but it also has an impact on the ocean system. What can you infer about the impact of
runoff on Ocean life? Choose ALL that apply.
A) Runoff drops a lot of sediment in the ocean, decreasing salinity.
B) Runoff builds up the coastline, depositing sediment, disrupting habitats of marine wildlife.
Runoff can lead to overgrowth of algae that can cause oxygen deprivation and create a dead zone.
D) Runoff carries pollutants into the ocean, causing illness and death of vulnerable marine populations.
) Runoff can carry bacteria, viruses and other pathogens from pet and livestock waste that can harm shellfish and other marine organisms.
Answer: Rain evaporates and this same process happens over and over again.
Explanation:
How many deciseconds are
in 554 seconds?
Give your answer in standard form.
Answer:
5540
Explanation:
Answer:
5,440
Explanation:
10 deciseconds = 1 seconds
554 seconds = 5,440 seconds
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+, Al3+, Cl−, O2−
Answer:
CaCl2
CaO
Al2O3
AlCl3
You can do this by swapping the values of charges on the ions as below
eg- Ca2+ - 2
Cl- - 1
Now combine 1 Ca atom and 2 Cl atoms and it will give you CaCl2
Al 3+ - 3
O2- - 2
Combine 2 atoms of Al and 3 atoms of O
Al2O3
In the case of CaO, we have to make sure that the atoms are in their simplest ratio. So although we get Ca2O2, CaO is the correct form
Name the elements that make the phone vibrate.
Answer:
someone calling you, notifications or apps
Explanation:
i need help!!!!! limited time! please Explain the energy transformation that occurs when food is digested.
Chemical energy transforms into mechanical energy.
Electrical energy transforms into mechanical energy.
Mechanical energy transforms into chemical energy.
Thermal energy transforms into electrical energy. I RLLY NEED HELP pls
Answer:
thermal energy
Explanation:
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Assume that 3.00 grams of HgO was used in this reaction. To determine the number of moles of oxygen gas formed, you need to know the number of moles of HgO reactant was used. What quantity in moles of HgO were used
Taking into account the reaction stoichiometry and the definition of molar mass, the quantity of HgO used is 0.01385 moles and 0.006925 moles of O₂ are formed when 3.00 grams of HgO was used.
In first place, the balanced reaction is:
2 HgO → 2 Hg + O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
HgO: 2 molesHg: 2 molesO₂: 1 moleThe molar mass of the compounds is:
HgO: 216.59 g/moleHg: 200.59 g/moleO₂: 32 g/mole
You know that 3.00 grams of HgO was used. Then, the quantity in moles of HgO used, can be calculated using the molar mass of HgO as follow:
[tex]3 gramsx\frac{1 mole}{216.59 grams}[/tex]= 0.01385 moles
Finally, the quantity of HgO used is 0.01385 moles.
To determine the number of moles of oxygen gas formed, the following rule of three can be applied: if by reaction stoichiometry 2 moles of HgO form 1 mole of O₂, 0.01385 moles of HgO form how many moles of O₂?
[tex]amount of moles of O_{2} =\frac{0.01385 moles of HgOx1 mole of O_{2} }{2 moles of HgO}[/tex]
amount of moles of O₂= 0.006925 moles
Then, 0.006925 moles of O₂ are formed when 3.00 grams of HgO was used.
Learn more:
brainly.com/question/24741074 brainly.com/question/24653699 brainly.com/question/23871710In a few minutes, you will work with your partner to create three dances—one for each of the three phases. Each dance will represent the molecular freedom of movement of that particular phase.
If needed, navigate back to My Work to refer to your homework from Lesson 1.4. Then, begin brainstorming ideas for movements that would show these phases.
Dance ideas for solids:
Dance ideas for liquids:
Dance ideas for gases:
How much heat is absorbed when 25 g of water increases by 45 K?
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
Let suppose that temperature change experienced by water is entirely sensible. Then, we can estimated the heat absorbed by the water sample ([tex]Q[/tex]), in joules, through this expression:
[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)
Where:
[tex]m[/tex] - Mass of the water sample, in grams.[tex]c[/tex] - Specific heat of water, in joules per kilogram-Kelvin.[tex]\Delta T[/tex] - Temperature change, in Kelvin.If we know that [tex]m = 25\,g[/tex], [tex]c = 4.186\,\frac{J}{g\cdot K}[/tex] and [tex]\Delta T = 45\,K[/tex], then the heat absorbed by the water sample is:
[tex]Q = (25\,g)\cdot \left(4.186\,\frac{J}{g\cdot K} \right)\cdot (45\,K)[/tex]
[tex]Q = 4709.25\,J[/tex]
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
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