Answer:
All ionic compounds with alkali metals are soluble.
Explanation:
Certain elements always form soluble substances. Most of those elements are alkali metals/group 1 metals.
What is the pressure exerted by 68.0 g of nitrogen trihydride gas in a 50.0L container at 30.0 C?
Answer:
Molecular mass of NH3 = ( 14 + 3 ) = 17 g
[tex]PV = \frac{m}{m _{r}} RT \\ P \times 50.0 \times {10}^{ - 6} = \frac{68.0}{17} \times 8.314 \times (30.0 + 273) \\ P = \frac{68.0 \times 8.314 \times 303}{17 \times 50.0 \times {10}^{ - 6} } \\ P = 2.02 \times {10}^{8} \: Pascals[/tex]
Earth's surface is shaped and changed in many ways. Which of these can shape Earth's surface?
water
wind
ice
gravity
organisms (living things)
the sun
none of these
all of the above
How will amino acids made with isotopes help scientists to answer this question?
Answer:
Proteins are made up of 20 amino acids. How an Isotope Technique Helps Determine Protein Quality. However be produced by the body and therefore are participated in the labelling process.
Explanation:
(reply w the answer or get reported) Ty if you answer this
Answer:
D. 34.5g
Explanation:
Using the following formula to calculate the mass of 1.5moles of sodium (Na);
Mole = mass/molar mass
Molar mass of Na = 23g/mol
mass = mole × molar mass
Mass of Na = 1.5mol × 23g/mol
Mass of Na = 34.5g
Chem pls help me thanks very much
Answer:
Flourine reacts with Sodium bromide to give Silver flourine and Bromine
Hope u understand
Thank You
Please mark as brainliest
Answer:
posaaaaaaaaaaaaaaaaaaaaa
[tex]what \: is \: sound \: \: {?} [/tex]
Answer:
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Explanation:
this is what i found hope it helps :)
Answer:
Sound is a form of energy which is caused due to the vibration of an object.
3. In a neutral solution, the [H+] is
zero
O 10-14M
O equal to [OH-]
O
1 x 107M
Answer:
a neutral solution has a pH of 7.
ph=-log(H+)
Explanation:
hence (H+)
=10⁷mol/dm³
What is a mixture called when it has its different components mixed unevenly within the substance?
Heterogeneous mixture
Homogeneous mixture
Impure mixture
Pure mixture
Answer:
Heterogeneous mixture...is the answer
The dude above me is right. I thought he was wrong, so I put A but it turns out he was right!
A solution contains 2.38 g of magnesium chloride, MgCl, in 500 cm3 of solution
What is the concentration of
chloride ions in g/dm3?
Answer:
3.54g Cl-/dm³
Explanation:
To solve this question we must, as first, find the mass of chloride ions finding first, the moles of MgCl2. Then, we must convert the cm³ to dm³ (1cm³ = 0.001dm³).
Moles MgCl2 -Molar mass: 95.211g/mol-
2.38g * (1mol / 95.211g) = 0.0250 moles MgCl2
Moles Cl-:
0.0250 moles MgCl2 * (2mol Cl- / 1mol MgCl2) = 0.0500 moles Cl-
Mass Cl- -Molar mass: 35.45g/mol-:
0.0500 moles Cl- * (35.45g / mol) = 1.77g of chloride ions
dm³:
500cm³ * (0.001dm³ / 1cm³) = 0.500dm³
The concentration is:
1.77g of chloride ions / 0.500dm³ =
3.54g Cl-/dm³How many particles are in 7.07x10^-6 moles of a substance?
Answer:
4.25*10^18
Explanation:
1 mole =6.023*10^23 particles
so 7.07*10^-6 mole=6.023*10^23*7.07*10^-6 particles=4.25*10^18 particles
Unit Test Review
Active
1
2
3
According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to
another?
O The volume and the shape stay the same.
O The volume increases to fill the new container, but the shape stays the same.
O The volume stays the same, but the shape changes to fit the new container
O The volume and the shape change to fill the new container
Answer:
the volume stays the same, but the shape changes to fit the new container
Explanation:
because the same amount/volume of liquid is being placed in a new container, the new container has a different shape to the old, thus changing the liquids shape but not volume.
Question 4 of 10
Which molecule is hexanal?
ОА, НС
ОН
В.
||
Ос. Н?
нсон
D.
Answer:
Hexanal, once commonly called caproic aldehyde, is a six-carbon straight-chain aldehyde. It is a clear liquid with an atmospheric-pressure boiling point of 131 ºC
Answer:
the answer is B the biggest one
Explanation:
What is the ration of H2O:O2? 2H2 + O2 → 2H 20
Explanation:
What are the mole ratio and the mass ratio for H2O to O2 in the reaction 2H2 + O2 → 2H2O? Mole ratio of H2O to O2 in the given reaction is H2O : O2 = 2 : 1. Mass ratio of H2O to O2 in the given reaction is H2O : O2 = 36 : 32 = 1 : 1.1.
Which type of energy transfer allows the Sun to warm Earth?
C. Radiation is the answer.
As it can happen in vacuum also
Answer: Radiation
Explanation:
what going on in each spot
nothing ksbsshshhzvsjajbsjshjsgdvdjhsbsj
Answer:
I don't know lol
How is wind speed indicated? What is the unit used to define wind speed?
Answer:
AnemometerknotExplanation:
Instrument used to measure wind speed are known as anemometer and can record wind speed, direction, and strength. The normal unit of wind speed is knots (nautical miles per hour)
1. How many moles are in the following:
a.
1.29 x 1024 hydrogen atoms in H
b. 7.36 x 1024 oxygen atoms
c. 3.28 x 1023 Na atoms
2. How many molecules are in 23.0 moles of oxygen?
3. How many moles are in 3.4 x 10molecules of H,SO,?
4. How many atoms are in 3.0 mole of Na?
5. How many molecules are in 200 moles of 03?
Answer:
Part (1a): The number of moles are 2.14 moles.
Part (1b): The number of moles are 12.2 moles.
Part (1c): The number of moles are 0.545 moles.
Part 2: The number of molecules are 1.38 × 10²⁵.
Part 3: The number of moles are 5.65 moles.
Part 4: The number of atoms are 1.81 × 10²⁴.
Part 5: The number of molecules are 1.20 × 10²⁶.
Explanation:
According to the mole concept:
1 mole of substance contains 6.022 × 10²³ number of atoms or molecules.
Part (1a): 1.29 × 10²⁴ hydrogen atoms in H
As, 6.022 × 10²³ number of hydrogen atoms present in 1 mole
So, 1.29 × 10²⁴ number of hydrogen atoms present in [tex]\frac{1.29\times 10^{24}}{6.022\times 10^{23}}=2.14[/tex] mole
Part (1b): 7.36 × 10²⁴ oxygen atoms
As, 6.022 × 10²³ number of oxygen atoms present in 1 mole
So, 7.36 × 10²⁴ number of oxygen atoms present in [tex]\frac{7.36\times 10^{24}}{6.022\times 10^{23}}=12.2[/tex] mole
Part (1c): 3.28 × 10²³ Na atoms
As, 6.022 × 10²³ number of Na atoms present in 1 mole
So, 3.28 × 10²³ number of Na atoms present in [tex]\frac{3.28\times 10^{23}}{6.022\times 10^{23}}=0.545[/tex] mole
Part 2:
As, 1 mole of oxygen contains 6.022 × 10²³ number of molecules
So, 23.0 moles of oxygen contains 23.0 × 6.022 × 10²³ = 1.38 × 10²⁵ number of molecules
Part 3:
As, 6.022 × 10²³ number of H₂SO₄ molecules present in 1 mole
So, 3.4 × 10 number of H₂SO₄ molecules present in [tex]\frac{3.4\times 10}{6.022\times 10^{23}}=5.65[/tex] mole
Part 4:
As, 1 mole of Na contains 6.022 × 10²³ number of atoms
So, 3.0 moles of Na contains 3.0 × 6.022 × 10²³ = 1.81 × 10²⁴ number of atoms
Part 5:
As, 1 mole of O₃ contains 6.022 × 10²³ number of molecules
So, 200 moles of O₃ contains 200 × 6.022 × 10²³ = 1.20 × 10²⁶ number of molecules
Why is one side of the moon called "the dark side of the moon"? O A. The moon's rotation time is exactly half the time of its revolution. B. The moon's rotation time is exactly twice the time of its revolution. O C. The moon's rotation and revolution take the same time.
Answer:
The moon's rotation and revolution take the same time.
Explanation:
the moon's rotation and orbit is closely synced-up with our planet's.
if 5.0g zinc reacts with 10.0 g hci to produce h2 gas and znci2 according to the following equation zn=2hci znci2 + h2 what is the limiting reactant and how many grams of h2 will be produced
Answer: The mass of [tex]H_2[/tex] produced is 0.153 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
For zinc:Given mass of zinc = 5.0 g
Molar mass of zinc = 65.38 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of zinc}=\frac{5.0g}{65.38g/mol}=0.0765mol[/tex]
For HCl:Given mass of HCl = 10.0 g
Molar mass of HCl = 36.46 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of HCl}=\frac{10.0g}{36.46g/mol}=0.274mol[/tex]
The given chemical equation follows:
[tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
By stoichiometry of the reaction:
If 1 mole of zinc reacts with 2 moles of HCl
So, 0.0765 moles of zinc will react with = [tex]\frac{2}{1}\times 0.0765=0.153mol[/tex] of HCl
As the given amount of HCl is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, zinc is considered a limiting reagent because it limits the formation of the product.
By the stoichiometry of the reaction:
If 1 mole of zinc produces 1 mole of [tex]H_2[/tex]
So, 0.0765 moles of zinc will produce = [tex]\frac{1}{1}\times 0.0765=0.0765mol[/tex] of [tex]H_2[/tex]
We know, molar mass of [tex]H_2[/tex] = 2 g/mol
Putting values in above equation, we get:
[tex]\text{Mass of }H_2=(0.0765mol\times 2g/mol)=0.153g[/tex]
Hence, the mass of [tex]H_2[/tex] produced is 0.153 g
somebody please help?
Que cantidad de solvente se necesita para obtener una solucion al 20% cuando se mezclan 600mg de alcohol.
Answer:
[tex]m_{solvente}=2400mg[/tex]
Explanation:
¡Hola!
En este caso, con la información dada, es posible inferir que este problema es acerca del porcentaje en masa del soluto y que se calcula de la siguiente manera, en términos de la masa de soluto y solución:
[tex]\% m=\frac{m_{soluto}}{m_{solucion}} *100\%[/tex]
De este modo, como conocemos el porcentage y la masa del soluto, podemos calcular la masa de la solución primero:
[tex]m_{solucion}=\frac{m_{soluto}}{\% m} *100\%\\\\m_{solucion}=\frac{600mg}{20\%} *100\%\\\\m_{solucion}=3000mg[/tex]
Esto quiere decir que la masa del solvente es:
[tex]m_{solvente}=m_{solucion}-m_{soluto}\\\\m_{solvente}=3000mg-600mg\\\\m_{solvente}=2400mg[/tex]
¡Saludos!
If you produce 35.7 grams of sodium chloride how many molecules of Chlorine gas were
needed?
2Na + Cl2 --> 2NaCl
(PLS HELP)
Answer: [tex]7.36\times 10^{23}[/tex] number of molecules of chlorine gas are needed.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of sodium chloride = 35.7 g
Molar mass of sodium chloride = 58.44 g/mol
Plugging values in equation 1:
[tex]\text{Moles of sodium chloride}=\frac{35.7g}{58.44g/mol}=0.611 mol[/tex]
The given chemical equation follows:
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
By the stoichiometry of the reaction:
If 1 mole of sodium chloride is produced from 2 moles of chlorine gas
So, 0.611 moles of sodium chloride will be produced from = [tex]\frac{2}{1}\times 0.611=1.222mol[/tex] of chlorine gas
According to the mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of molecules
So, 1.222 moles of chlorine gas will contain = [tex]\frac{6.022\times 10^{23}}{1mol}\times 1.222mol=7.36\times 10^{23}[/tex] number of molecules
Hence, [tex]7.36\times 10^{23}[/tex] number of molecules of chlorine gas is needed.
When 0.215 mol of a gas is placed into a 34.25 mL container at 125.0°C, 1
it will exert a pressure on the container. Justin has been asked to
calculate the pressure that this gas will exert on the container in kPa, then
to
go into the lab and measure this pressure.What will he determine is the
pressure of the gas?
Answer:
205.12 atm
Explanation:
Using the ideal gas law equation:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = 0.0821 Latm/perK)
T = temperature (K)
n = number of moles (mol)
According to the information in this question;
P = ?
V = 34.25 mL = 34.25 ÷ 1000 = 0.03425L
n = 0.215 mol
T = 125.0°C = 125 + 273 = 398K
Using PV = nRT
P = nRT ÷ V
P = (0.215 × 0.0821 × 398) ÷ (0.03425)
P = 7.025 ÷ 0.03425
P = 205.12 atm
1. If 2 moles of hydrogen combine with one mole of oxygen, how many moles of water are
produced?
Drag the tiles to the correct boxes to complete the pairs.
Match each mineral with its main function in the body.
Answer:
Hello calcium maintains healthy bones and muscles. Zinc is for immune function. Iron carrier oxygen to blood. Sodium maintains fluid balance in the body.
Answer: Zinc : plays a role in immune system function
Iron: carries oxygen to all body tissues
Calcium: Maintains healthy bones and muscles
Sodium: maintains fluid balance in the body
Explanation: Got it right on PLATO/edmentum
During which phase change does the entropy of a sample of H2O increase?
1. H2O(g) -> H2O(l)
2. H2O(g) -> H2O(s)
3. H2O(l) -> H2O(g)
4. H2O(l) ->H2O(s)
Answer: 3. H2O(l) -> H2O(g)
Explanation: Entropy is a measure of the randomness or disorder a substance. Gasses have the greatest amount of entropy and solids have the least amount of entropy. The entropy of a sample of H2O increases as liquid water evaporates and changes to a gas.
The entropy of a sample of H2O increases when the phase of change that is H2O(l) -> H2O(g) occurs. This is because entropy increases when a substance undergoes sublimation (solid to gas) or evaporation (liquid to gas).
What is meant by entropy?The entropy of an object is a measure of the amount of energy that is unavailable to do work.Entropy depends upon the randomness of molecules, number of molecules, and heat content. During which phase does entropy increase?A substance in the solid phase has low entropy.A substance in the liquid phase has medium entropy.A substance in the gas phase has high entropy.When a substance goes from a solid to a gas (sublimation) or from a liquid to a gas (evaporation), entropy increases.When the given sample of H2O changes its phase from liquid to gas, the entropy increases. It also happens when it changes from solid to gas.
Thus, option 3: H2O(l) -> H2O(g), the entropy increases.
Learn more about the entropy here:
https://brainly.com/question/16718133
https://brainly.com/question/17113982
#SPJ2
Explain the difference between solid,liquid an gaseous in the theorotical
Answer:
Difference between Solid Liquid and Gases
Solids Liquids Gases
Highly Strong intermolecular forces between the molecules, leads to a definite volume in Solids. The intermolecular forces are stronger than gases but weaker than solids. The intermolecular forces are practically non-existent. Thus, there is no definite volume.
Solids have a definite shape to them. Liquids do not have a definite shape. Gases do not have a definite shape.
The intermolecular space between solids is absent. The intermolecular space is moderate but present. The intermolecular space is free-flowing and plenty.
The force of attraction between the molecules is incredibly high. The force of attraction between molecules is pretty moderate. There is no intermolecular force of attraction between the molecules.
Too much Carbon Dioxide in the atmosphere is a bad
thing. However, too little is also bad. Explain why it is important
for Carbon Dioxide to always exist in the atmosphere. Give specific examples of what it is used for to support your response.
Answer:
CO2 is an evil necessary element. co2 is needed for our survival. we need food for survival and food is produced by the plants through photosynthesis. for photosynthesis to take place co2 is one of the vital element. so no co2,no photosyntheseis maeans no food. no food no one will survive.
Which of the following diagram is the correct electron dot diagram for AL
Answer:
the answer is a
Explanation:
A mixture of He, Ne, and N2 gases has a pressure of 1.943 atm. If the pressures of He and Ne are 0.137 atm and 0.566 atm, respectively, what is the partial pressure of N2 in the mixture?  A. 0.703 atm  B. 1.24 atm  C. 0.151 atm  D. 1.943 atm
Answer:
The parcial pressure of N₂ in the mixture is 1.24 atm.
Explanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
In this case:
PT=PHe + PNe + PN₂
You know:
PT= 1.943 atmPHe= 0.137 atmPNe= 0.566 atmPN₂= ?Replacing:
1.943 atm= 0.137 atm + 0.566 atm + PN₂
Solving:
1.943 atm= 0.703 atm + PN₂
1.943 atm - 0.703 atm= PN₂
1.24 atm= PN₂
The parcial pressure of N₂ in the mixture is 1.24 atm.