Answer:
Na2CrO4
Explanation:
it cannot be without subscript
"You have a solution of glucose in water that has a concentration of 2.50 M and a volume of 0.442 liters. You dilute this solution with water to make a total volume of 1.50 liters. What is the final concentration of this solution?"
Answer:
0.737M
Explanation:
C1V1=C2V2
2.50 x 0.442 = C x 1.5
1.105 = C x 1.5
C = 1.105/1.5
C = 0.737M
what is the chemical test to differentiate ethanol from ethanoic acid
Answer:
Sodium hydrogencarbonate or sodium carbonate
Which of the following is the best definition of matter?
1.Anything that uses energy
2.Anything that's alive
3.Anything that's visible
4.Anything that has mass
ASAP PLEASEEE
Answer:
4.Anything that has mass
Explanation:
In order to appreciate what matter is, we must first know that matter is the 'stuff' that makes up the universe. Everything in the universe is composed of matter. Matter in turn is made up of atoms. Intact mass is the quantity of matter in a body.
All matter must have mass and occupy space. Hence all matter must have a measurable mass. This is a fundamental property of all matter. Hence every object in the universe has mass because it is composed of matter. We find matter in our plates, spoons , clothes and indeed everything we see in the universe! For instance, you can measure the mass of a spoon because it is made of matter which has mass and occupy space.
Consider the following statements and describe them as a solid, liquid or gas. Keep in mind that there may be more than one correct answer. For example, if it asks for a phase who particles are close together, both solid and liquid would be correct. 1. Particles are very far apart. 2. Particles are moving quickly. 3. Particles can flow past each other. 4. Particles are very close together.
Answer:
[tex]\boxed{\mathrm{view \: explanation}}[/tex]
Explanation:
1. Particles are very far apart. (Gas)
2. Particles are moving quickly. (Liquid, Gas)
3. Particles can flow past each other. (Liquid)
4. Particles are very close together. (Solid)
Gas particles are very far apart from each other and move quickly. Liquid particles can flow past each other and can move quickly. Solid particles are tightly packed together.
Answer:
1) Gases (Gases are very very far apart)
2) Liquids, Gases (Liquids and Gases move freely because of weak interactive forces)
3) Liquid (Liquid has high fluidity and thus, has the ability to flow past each other)
4) Solid (Solid have particles very close to each other because of stronger attractive forces)
Calculate the concentration, in units of dm-3, of sulfuric acid, H2SO4, which has a solubility of 2 mol dm-3. [Relative atomic mass: H = 1, O = 16, S = 32]
Answer:
196 gdm-3
Explanation:
There are two major units of concentration, moldm-3 and gdm-3. The first unit refers to molar concentration while the second unit refers to mass concentration. Both units are useful in chemistry when describing the concentration of solutions as deemed expedient in each particular case.
Here we are required to compute the mass concentration from the molar concentration. We must recall that; mass concentration= molar concentration × molar mass
Let us first obtain the molar mass of H2SO4 from the relative atomic masses given=
2(1) + 32 + 4(16) = 98 gmol-1
Molar concentration of H2SO4 = 2 moldm-3
Mass concentration= 2 moldm-3 × 98 gmol-1
Mass concentration = 196 gdm-3
what causes convection in currents in the air? a. the revolution of the earth around the sun. b. the rotation of the earth around itself. c. the heat on the surface of the earth. d. conversion of solid-gas directly
Answer:
THE HEAT ON THE SURFACE OF THE EARTH
Explanation:
Answer:
Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
Explanation:
how many litres of fluorine gas at stp can be collected from the decomposition of 90.7 g of AuF3
Answer: 12 L fluorine gas at STP can be collected from the decomposition of 90.7 g of [tex]AuF_3[/tex]
Explanation:
The balanced decomposition reaction is shown as
[tex]2AuF_3\rightarrow 2Au+3F_2[/tex]
moles of [tex]AuF_3=\frac{\text {given mass}}{\text {Molar mass}}=\frac{90.7g}{254g/mol}=0.36moles[/tex]
According to stoichiometry:
2 moles of [tex]AuF_3[/tex] gives = 3 moles of flourine gas
Thus 0.36 moles of [tex]AuF_3[/tex] gives = [tex]\frac{3}{2}\times 0.36=0.54moles[/tex] of flourine gas
Using ideal gas equation :
[tex]PV=nRT[/tex]
P = pressure of gas = 1 atm ( at STP)
V = Volume of gas = ?
n = moles of gas = 0.54
R = gas constant = 0.0821 L atm/Kmol
T = temperature = 273 K ( at STP)
Putting the values we get :
[tex]1atm\times V=0.54mol\times 0.0821Latm/Kmol\times 273K[/tex]
[tex]V=12L[/tex]
Thus 12 L fluorine gas at STP can be collected from the decomposition of 90.7 g of [tex]AuF_3[/tex]
in the Leclanch dry cell ,which is electrolyte substance ?
Answer:
hey there,
ammonium chloride is the electrolyte substance in the Leclanche dry cell!
Explanation:
The table below lists the properties of a metallic element. Shiny, Silver colored, Forms +1 and +2 ions, compound with sulfur is bright red. Where on the periodic table would this element most likely be found?
Group 1
Group 2
Group 12
Group 13
Answer:
The correct option is;
Group 12
Explanation:
A metallic element that is shiny and silver colored that can exist in the +1 and +2 ionic states and which forms a bright red compound with sulfur is mercury, Hg
The compound formed between mercury and silver is one of the earliest synthetic compound also known as vermilion and cinnabar. The bright red pigment of the HgS is used widely and is one of the most favorite pigment found in medieval European outstanding works of arts and in Chinese decorated wares made of lacquer as well as in mesoAmerica.
Answer:
12
Explanation:
15. Discuss the various factors which affect the rate of evaporation. Latent heat
evaporation of two liquids A and B is 100 J/kg and 150 J/kg respectively. Which
can produce more cooling effect and why? (5)
Answer:
The correct answer is liquid B.
Explanation:
Latent heat of vaporization also known as the latent heat of evaporation. This latent heat transforms the particles of liquid into a gas without affecting its temperature. For example, the latent heat of evaporation for water is 40.8 kJ per mole, that is, 40.8 kJ per mole of heat is needed to transform water into vapor at 373 K.
It is known that latent heat of evaporation of a liquid is directly proportional to the cooling effect it generates, that is, more the latent heat of evaporation more will be its cooling effect. Thus, it is clear that liquid B will show the more cooling effect as the latent heat of evaporation of liquid B is more in comparison to liquid A. Thus, more heat will be captivated by liquid B and will generate more cooling effect in comparison to liquid A.
A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mmHg. The flask is opened and more gas is added to the flask. The new pressure is 795 mmHg and the temperature is now 26 °C. There are now __________ mol of gas in the flask.
Answer:
The new moles of the gas in the flask is 2.13 moles.
Explanation:
Given;
number of moles of gas, n = 1.9 mol
temperature of the gas, T = 21 °C = 21 + 273 = 294 K
pressure of gas, P = 697 mmHg
volume of gas, V = ?
Apply ideal gas law;
PV = nRT
Where;
R is gas constant, = 62.363 mmHg.L / mol. K
V = nRT / P
V = (1.9 x 62.363 x 294) / 697
V = 49.98 L
New pressure of the gas, P = 795 mmHg
New temperature of the gas, T = 26 °C = 273 + 26 = 299 K
New moles of the gas, n = ?
Volume of the gas is constant because volume of the flask is the same when more gas was added.
n = PV / RT
n = (795 x 49.98) / (62.363 x 299)
n = 2.13 moles
Therefore, the new moles of the gas in the flask is 2.13 moles.
18. An electric motor turns a belt that powers a pump. If this system is compared to the chemical reactions of the cell, which part represents
ATP?
the electric motor
the pump
the belt
Answer:
A. the electric motor
Explanation:
A cell is a biological molecule which is the basic and functional unit of life. Cells undergo series of processes to function appropriately. ATP is an acronym for adenosine triphosphate, which is the source of energy for various cell processes.
In the given mechanical system, the electric motor provides the energy required energy to drive the system. Therefore, the electric motor has the same major function of providing energy for the system as the ATP in a cell.
. The four metals, Strontium(Sr), Francium (Fr), Yttrium (Y), and Europium (Eu), in separate experiments, are dipped in aqueous solutions of SrNO3, FrNO3, Y(NO3)3, and Eu(NO3)2. The following results are obtained: 1. Yttrium metal does not react with any of the solutions 2. Strontium metal reacts with all of the other metals solutions 3. Francium metal reacts in a solution of Eu(NO3)2 a) List the four oxidizing agents in order from strongest to weakest by creating a small reduction table. Explain your reasoning below b) List the four reducing agents in order from strongest to weakest
Answer:
a) Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
b) Sr > Fr > Eu > Y
Explanation:
Y is the least reactive metal because it does not react with any of the other solutions.
Sr is the most reactive metal because it reacts with all of the other solutions.
Sr + 2Fr⁺ ⟶Sr²⁺ + 2Fr
3Sr + 2Y³⁺ ⟶ 2Sr²⁺ + 2Y
Sr + Eu²⁺ ⟶ Sr²⁺ + Eu
Fr is more reactive than Eu because it reacts with Eu(NO₃)₂.
2Fr + Eu²⁺ ⟶ 2Fr⁺ + Eu
The order of reactivity is
Sr > Fr > Eu > Y
b) Reducing agents
In each of the above reactions. the more reactive metal is acting as a reducing agent — it is donating electrons to the cation of the other metal.
Thus, the order of activity of reducing agents is
Sr > Fr > Eu > Y
a) Oxidizing agents
The metal cations are the oxidizing agents.
The order of reactivity of the oxidizing agents is the reverse order of the reducing agents
Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
c) Standard reduction potential table
See the image below.
Explain the three states of matter on the basis of characteristics of particles/ molecules of matter.
Answer :
Explanation For The Three States OF Matter On the Basis OF Characteristics Of Particles / Molecules OF Matter.
Solid:In solids the molecules are closely packed . There is a strong force of attraction between the molecules and the space between them is very small (almost negligible). The molecules are , therefore, not free to move . They merely vibrate their mean positions . This makes solids hard and difficult to compress , giving them a fixed shape and size.
Liquid :In the case of liquids , the molecules are not closely packed. They do not attract each other as strongly as the molecules of solids. Thus, the intermolecular spaces are larger and the molecules are able to move about more freely . This makes liquid flow and take the shape of the container into which it is poured. Thus, liquids have a fixed volume but no definite shape of their own .
Gas :In the case of gases, the molecules hardly attract each other. They lie far a part from each other and the intermolecular spaces are, therefore, very large. . The intermolecular force of attraction is so weak that the molecules have great freedom of movement . As a result , gases have neither a fixed shapenor a fixed volume . They completely full up spacw available to them. They can be easily compressed as well, thus decreasing the gaps between their molecules .
Explanation :
Hope it works out !what is the main idea of the article, "Great Wall of China"?
well, without the article, I'm guessing the main idea is about the Great Wall of China
Which statement is true about a catalyst
Answer:
Catalysts are chemically unchanged at the end of a reaction.
Explanation:
Catalysts only increase the chances of chemical reaction, without itself undergoing any kind of chemical change.
Answer:
its the process of increasing the rate of a chemical reaction
Explanation:
At 127°c,400ml of a gas exerts a pressure of 120 torr. What would be the pressure exerted by 200ml of a gas if the temperature decrease to 27°c?
Answer:
180 Torr.
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial temperature (T1) = 127 °C
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 27 °C
Final pressure (P2) =..?
Step 2:
Conversion of celsius temperature to Kelvin temperature.
This is illustrated below:
Temperature (Kelvin) = Temperature (celsius) + 273
T(K) = T(°C) + 273
Initial temperature (T1) = 127 °C
Initial temperature (T1) = 127 °C + 273 = 400 K
Final temperature (T2) = 27 °C
Final temperature (T2) = 27 °C + 273 = 300 K
Step 3:
Determination of the final pressure.
This can be obtained by using the general gas equation as shown below:
Initial temperature (T1) = 400 K
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 300 K
Final pressure (P2) =..?
P1V1/T1 = P2V2/T2
120 x 400/400 = P2 x 200/300
120 = P2 x 2/3
Cross multiply
P2 x 2 = 120 x 3
Divide both side by 2
P2 = (120 x 3)/2
P2 = 180 Torr.
Therefore, the new pressure exerted by the gas is 180 Torr.
What is the name of the Group 17 elements ?
Answer:
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
The name of the Group 17 elements is called halogens
What is the name of group 17 elements?The group 17 elements are very reactive elements. Members of this group include:
Fluorine (F)Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)The group 17 element are known to produce salts as they react with metals. Hence, they are called halogens
The group 17 elements are have 7 valence electrons and they required one electron to attain the stable octet configuration of the noble gas family.
From the above, we can see that the name of group 17 elements is halogens
Learn more about group 17 elements:
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Which of the following statements is false? Please choose the correct answer from the following choices, and then select the submit answer button. An apple does not have potential energy because it cannot move on its own. Potential energy is stored energy; therefore, chemical energy is a type of potential energy. Chemical energy refers to the storage of energy in chemical bonds. Energy can be defined as the capacity to do work. Work is anything that involves moving matter against an opposing force
Answer:
Chemical energy refers to the storage of energy in chemical bonds
Explanation:
Chemical energy refers to the storage of energy in chemical bonds
The atomic size of sodium is smaller than that of the sodium why?
What is another name for group 14 A.GRoup 4 B.Group 4A C.GRoup 4b D.GRoup 14a
Answer:
A. Group 4
Explanation:
Also called carbon family or the tetrels
Answer:
4a
Explanation:
Using logarithms, you determined the A)Solubility B)Temperatures C)ph
of 7 solutions ranging from
strong acid to neutral to strong base.
Answer:
the answer is pH
Explanation:
Just took it on ed2020
Answer:
The first part is pH
The second part is calibrate
The third part is all three
Using various concentrations of HCl and NaOH to measure a range of pH
Using an existing scale to determine pH
Knowing that the cabbage indicator always has the same color at a given pH value
Explanation:
Which topic is commonly used to explain activation energy and how chemical reactio
reaction rate
collision theory
velocity distribution
spontaneous reaction
Answer:
The answer is collision theory
I hope this helps you.
When compound A (C5H12O) is treated with HBr, it forms compound B (C5H11Br). The 1H NMR spectrum of compound A has a 1H singlet, a 3Hdoublet, a 6H doublet, and two 1H multiplets. The 1H NMR spectrum of compound B has a 6H singlet, a 3H triplet, and a 2H quartet. Identify compounds A and B.
Answer:
attached here is the diagram of the solution
Explanation:
The atmospheric gas that forms a mild acid when dissolved in water is _____.
Answer:
Carbon dioxide
HAVE A GOOD DAY!
Answer:
Carbon Dioxide
Explanation:
Carbon dioxide is in the atmosphere and is an end product in organisms that obtain energy from breaking down sugars, fats and amino acids with oxygen as part of their metabolism.
400 ml of a 75 M solution of H2SO4 is needed to for a lab. The stock solution is 16.0 M. Calculate how much stock is needed to make the solution.
Answer:
The volume of stock solution needed to make the solution is 1875 ml
Explanation:
The parameters given are;
The volume of 75 M solution of H₂SO₄ = 400 ml
The concentration of stock solution = 16.0 M
Number moles per liter of stock solution = 16 moles
Number of moles in required 400 ml solution = 0.4×75 = 30 M
Volume of stock solution that contains 30 M = 30/16×1 = 1.875 l
The volume of stock solution that is required = 1875 ml
CALCULATE THE VOLUME OF 16 g OF OXYGEN GAS AT S.T.P?
Answer:
To calculate the volume we must first find the number of moles
Number of moles (n ) = mass / Molar mass (M)
Since oxygen is diatomic
M of oxygen = 16 × 2 = 32g/mol
n = 16 / 32 = 0.5mol
Next we use the formula
V = n × V(dm³)
where V is the volume
V(dm³) is the volume of 1 mole of a substance at s.t.p which is
22.4dm³
Volume of oxygen gas at s.t.p is
0.5 × 22.4dm³
= 11.20dm³
Hope this helps you
Which could cause topsoil to be lost? a) wind and water erosion b)lack of use c)compaction d)desertification
Answer:
Which could cause topsoil to be lost?
a) wind and water erosion
Explanation:
A natural and common cause of soil erosion is Water. Water can carry away tiny soil particles.
Raindrops can impact the soil surface and can break down the aggregates in soil and scatter them.
Water runoff is another cause of soil erosion and this occurs when water on a slope isn’t absorbed into the soil or becomes trapped on the surface.
Loose particles can be picked up and carried away by the wind.
Soil surfaces can be worn down when struck by airborne particles carried by the wind.
B. Lack of use of the top soil rather helps the top soil to regain its nutrients.
c. Compaction can the topsoil from losing particles, since there are no loose particles to be picked up.
D. Desertification mostly causes the soil to lose its nutrients, not go away completely.
Hope this helps!
Answer:
The correct answer is A
Explanation:
What volume of Co2 (carbon (iv) oxide)
will be produced when 10g of Na2Co3
(sodium trioxocarbonate (iv) reacted
with excess Hcl (Hydrogen Chloride) at
STP(Na=23, C=12, O=16)
Answer:
2.1056L or 2105.6mL
Explanation:
We'll begin by calculating the number of mole in 10g of Na2CO3. This can be obtained as follow:
Molar mass of Na2CO3 = (23x2) + 12 + (16x3) = 106g/mol
Mass of Na2CO3 = 10g
Mole of Na2CO3 =.?
Mole = mass /molar mass
Mole of Na2CO3 = 10/106
Mole of Na2CO3 = 0.094 mole
Next, we shall determine the number of mole CO2 produced by the reaction of 0.094 mole of Na2CO3. This is illustrated below:
Na2CO3 + 2HCl —> 2NaCl + H2O + CO2
From the balanced equation above,
1 mole of Na2CO3 reacted to produce 1 mole of CO2.
Therefore, 0.094 mole of Na2CO3 will also react to 0.094 mole of CO2.
Next, we shall determine the volume occupied by 0.094 mole of CO2 at STP. This is illustrated below:
1 mole of a gas occupy 22.4L at STP. This implies that 1 mole CO2 occupies 22.4L at STP.
Now, if 1 mole of CO2 occupy 22.4L at STP, then, 0.094 mole of CO2 will occupy = 0.094 x 22.4 = 2.1056L
Therefore, the volume of CO2 produced is 2.1056L or 2105.6mL
DETAILED Description on the applications of Nanochemistry.... about 100 words for each( note: has to be detailed)
Answer:
Explanation:
Nanochemistry is a branch of nanoscience, deals with the chemical applications of nanomaterials in nanotechnology.
Nanochemistry involves the study of the synthesis and characterisation of materials of nanoscale size.