Answer:
A) Solute
Explanation:
In forming a solution, the substance which is dissolved by the action of the solvent is called solute.
A block has a length of 9.50mm, width 10.25mm, and height of 50.80 mm. If its mass is 38.7322 grams , what is the density in gram/cm³
Answer: 7.82999 g/cm³
Explanation:
1. Divide all of the lengths of the block by 10 to get them from mm to cm
2. Calculate volume of box
3. Calculate density using volume and mass
Students conducting a lab investigation are given two unknown tubes of colorless aqueous solutions. The students are told that one tube is a salt solution and the other is a sucrose solution. How can the students determine which of the solutions contains salt?
The students can determine which of the solutions contains salt through the conductive tester.
What is an ionic solution?It is a solution containing ions are atoms that have gained or lost electrons to acquire a positive (lost electron) or negative (gained electron) charge.
An ionic solution would be able to conduct electricity whereas the covalent would not so if you have a conductivity tester which is available in most labs.
The students can distinguish between the 2 solutions through the conductive tester.
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7. How many molecules are in 4.80 moles of NaCL?
Answer:
280gr of salt
Explanation:
4.80 x ( 22.99 + 35.45) = 280gr
Simple as that
How would a scientist classify a centipede? 12 points!!! pls help.
A. Arthropod
B. Amphibian
C. Mammal
D. Reptile
Using the Equilibrium Solubility Constant
Some carbonate compounds have limited solubility.
MCO3(s) M²+ (aq) + CO3²- (aq)
The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.5E-7.
A saturated solution of the compound MCO3, is made.
Calculate the concentration of the ions M²+ (aq) and CO32-(aq) in the saturated solution (check the stoichiometry, the
ions will have the same concentration).
Give your answer to three significant figures, using the exponential format, example enter 0.0000382 as 3.82e-5
with no gaps and the -ve e if power is -ve.
Answer:
The solubility product constant (Ksp) describes the equilibrium between a solid and its constituent ions in a solution. The value of the constant identifies the degree to which the compound can dissociate in water. The higher the Ksp, the more soluble the compound is.
Answer:
MCO3(s) M2+(aq) + CO32-(aq) The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.83E-7. A saturated solution of the compound MCO3, is made.
Explanation:
What is the molar mass of fluorapatite (Ca5(PO4)3F)?
Answer: 504.3
Explanation: Add the respective weights of each of the elements in the compound together.
Example of solvent extraction
Answer:
Liquid–liquid extraction
Explanation:
For the reaction
2 HCl + Na2CO3 → 2 NaCl + H2O + CO2
179.2 liters of CO2 is collected at STP. How
many moles of NaCl are also formed?
Answer:
16 mol NaCl.
Explanation:
Do the train track method to cancel out all the units except moles of NaCl on top. Remember one mole of any gas occupies 22.4 L at STP.
179.2 L CO2 x 1 mol CO2/22.4 L CO2 x 2 mol NaCl/1 mol CO2
= 16 mol NaCl
1. Once tissue fluid enters the lymphatic capillaries, it is called what?
Lymph
Ducts
Organs
Nodes
The volume of a gas filled balloon is 22L at 313K and 1.5 atm. What would the volume be at 273K and 1 atm?
Answer:
28L
Explanation:
V1 = 22L V2 = ?
T1 = 313K T2 = 273K
P1 = 1.5atm P2 = 1.0atm
Using the combined gas law equations;
[tex]\frac{P1V1}{T1}= \frac{P2V2}{T2}[/tex]
∴[tex]V2 = \frac{P1V1}{T1} * \frac{T2}{P2}[/tex]
= [tex]\frac{1.5*22}{313} * (\frac{273}{1})[/tex]
V2 = 28L
From the calculations and the statement of the general gas equation, the volume of the gas becomes 28.8 L
What are gas laws?The gas laws are used to show the relationship between the variables in problems that has to do with gases.
In this case, we have to apply the general gas law as follows;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = * 22L * 1.5 atm * 273K/313K * 1 atm
V2 = 28.8 L
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1. How many moles are in 78.9g of HCI?
a gas sample has a total pressure of 1.7atm. if the sample contains 2 gases and 1 gas has pressure of 0.7 atm, what is the pressure exerted by the other gas?
Answer:
1 atm
Explanation:
The other gas exerts the remaining pressure
1.7 - .7 = 1 atm
Which is NOT included
in the appendicular
skeleton?
B. leg bones
A. arm bones
D. pelvic bones
C. ribs
Answer:
C. ribs.
Explanation:
The appendicular skeleton includes the shoulder girdles and arm bones, the pelvic gridle and the lower limb bones (leg bones). The ribs is part of the axial skeleton.
During which of the following 50-year intervals has the world's population increased the most? O A. 1850-1900 O B. 1800-1850 O C. 1900-1950 O D. 1950-2000
Answer:1950-200
Explanation:
During 1950-2000 of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.
What is population?The whole number of people or inhabitants in a country or region.
The world's population increased from 2.5 billion in 1950 to around 7.3 billion in 2015 and is expected to continue to rise until 2050/2100 under most UN.
During 1950-2000 of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.
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How many moles are in 0.50 g sodium bromide
does vitamin b1 contain chemicals or a chemical reaction
8. Which of the following is NOT true of atoms?
a. They are composed of molecules.
b. They combine to form compounds. c. They make up elements.
d. They are extremely small.
Answer:
The correct answer should be (A)
Explanation:
This is bcos its atoms ions and molecules that make up matter
Chloroquine is used to treat malaria. Studies have shown that one dose for a 12 kg child is 3.5 mg/kg of body weight and that 4 doses should be taken per day. How many milligrams of this drug should be given in one day?
Round your answer to the correct number of sig figs.
Answer: 100 milligrams per dose
10 mg per kg. The drug of ten kilos so you do
10 mg * 10 kg = 100 mg per dose
Explanation:
Use the equation to answer the following question.
2H₂ + O₂ → 2H₂O
How many grams of H₂O are produced from 64.0 g of O₂?
O A. 72.1 g
Answer:
rsghkm vumm
Explanation:
el correo de confirmación con la que se ha enviado desde correo ok recibido gracias saludos María del Ca
At equilibrium,
a, the forward reaction rate is lower than the reverse reaction rate.
b. the forward reaction rate is higher than the reverse reaction rate.
c. the forward reaction rate is equal to the reverse reaction rate.
d. po reactions take place.
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C. the forward reaction rate is equal to the reverse reaction rate
Chemical equilibrium is dynamic in nature and it can be attained only if the system is a closed one. At equilibrium the forward reaction rate is equal to the reverse reaction rate. The correct option is C.
What is chemical equilibrium?The state of a system in which the measurable properties of the system do not undergo any further noticeable change under a particular set of conditions is called the state of equilibrium. The properties like pressure, concentration, etc. is constant at equilibrium and remain unchanged thereafter.
An equilibrium can be attained from either direction, i.e., from the direction of the reactants as well as from the direction of the products. At equilibrium the rate of forward reaction is equal to that of the backward direction.
In forward reaction, the reactants are converted into products and in backward reaction, the products are changed into the reactants.
Thus the correct option is C.
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What is the name of the functional group that is attached to this hydrocarbon? a carbon atom is single bonded to o h to the right, and h below, left, and above. alkyl halide alcohol carbonyl ketone
The name of the functional group that is attached to the following hydrocarbon is alcohol. Details about functional group can be found below.
What is functional group?A functional group in chemistry refers to a specific grouping of elements that is characteristic of a class of compounds, and determines their chemical properties.
According to this question, a hydrocarbon was given to possess the following formula:
CH3OH
This hydrocarbon is methanol and posseses an alcohol functional group (OH).
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What is the name of the functional group that is attached to this hydrocarbon?
H
│
H ─ C ─ OH
│
H
❌ A) alkyl halide
✔️ B) alcohol❌ C) carbonyl
❌ D) ketone
I Took Question Test And Nice Day.
how many moles of o2 are needed to produce 34.7g of fe203
Answer:
5.09 moles of Fe is required to react with 3.82 moles of O₂.
0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Reaction stoichiometry
In first place, the balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
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:
Fe: 4 moles
O₂: 3 moles
Fe₂O₃: 2 moles
The molar mass of the compounds is:
Fe: 55.85 g/mole
O₂: 32 g/mole
Fe₂O₃: 159.7 g/mole
Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe: 4 moles ×55.85 g/mole= 223.4 grams
O₂: 3 moles ×32 g/mole= 96 grams
Fe₂O₃: 2 moles ×159.7 g/mole= 319.3 grams
Moles of Fe needed
The following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ react with 4 moles of Fe, 3.82 moles of O₂ react with how many moles of Fe?
moles of Fe= 5.09 moles
Finally, 5.09 moles of Fe is required to react with 3.82 moles of O₂.
Moles of O₂ needed
The following rules of three can be applied: If by reaction stoichiometry 319.3 grams of Fe₂O₃ are formed from 3 moles of O₂, 34.7 grams of Fe₂O₃ are formed from how many moles of O₂?
moles of O₂= 0.326 moles
Finally, 0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Explanation:
Help! 100 point and I will give a brainliest and 5 star for solving this question.
100ml of 0.1 N H2SO4 by diluting from original H2SO4.
Atomic mass of: O=16 , H=1 S=32
d H2SO4=1.08 purity%=98%
i need the solution.
Mass of H_2SO_4 required
Molarity
Moles of solute/Volume of solution in LSo
0.1=n/0.1Ln=0.1(0.1)n=0.01molNow molar mass of H_2SO_4
2(1)+32+4(16)2+32+6498g/molMass
98(0.01)0.98gHow many moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride, N2Cl3?
The number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.
What are a number of moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
1 mole is 6.022 × 10²³
[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]
The given number of moles are 1.64 x 10²³
[tex]1.64 \times 10^2^3= \dfrac{1}{6.023 \times 10^2^3} = 0.272 \\[/tex]
Now, there are two molecules of nitrogen in the dinitrogen trichloride
So, 0.272 x 2 = 0.544
Thus, the number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.
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What is the percent composition of Cesium and Fluorine in CsF?
The percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
What is a percentage composition?Percent composition is very simple. Percent composition tells you by mass what percent of each element is present in a compound.
Molecular mass of Cs = 132.9054519
Molecular mass of F = 18.9984032
Molecular mass of CsF = 132.9054519 + 18.9984032 = 151.9038551
CsF: Percent composition by element:
Cesium (Cs) = [tex]\frac{32.9054519 X 100}{151.9038551}[/tex] = 87.493 %
Fluorine (F) = [tex]\frac{18.9984032 X 100 }{151.9038551}[/tex]= 12.507 %
Hence, the percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
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For each reaction below, use the drop-down menus to select which compound will form a precipitate. Note: It is possible that no precipitates form. Na2S + Cd(NO3)2 → CdS + 2NaNO3 FeCl3 + 3KOH → 3KCl + Fe(OH)3 Na2CO3 + Ba(NO3)2 → BaCO3 + 2NaNO3
Answer:
1. Cadmium sulfide
2. Iron (III) hrydroxide
3. Barium carbonate
Cadmium sulfide, iron hydroxide, and barium carbonate will form a precipitate.
What is Precipitation Reaction?The precipitation reaction can be described as a chemical reaction taking place in an aqueous solution where two ionic bonds combine in order to form an insoluble salt.
These insoluble salts form are called precipitates in precipitation reactions. Precipitation reactions are commonly double displacement reactions in which the production of a solid forms a residue known as the precipitate.
The first reaction: [tex]Na_2S + Cd(NO_3)_2 \longrightarrow CdS + 2NaNO_3[/tex]
The cadmium sulfide forms precipitates in this reaction.
The second reaction: [tex]FeCl_3 + 3KOH \longrightarrow 3KCl + Fe(OH)_3[/tex]
The iron hydroxide forms precipitate in this reaction.
The third reaction:[tex]Na_2CO_3 + Ba(NO_3)_2 \longrightarrow BaCO_3 + 2NaNO_3[/tex]
The barium carbonate forms precipitate in this reaction.
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How much heat does it take to warm 16.0 g of pure water from 90.0 degree C to 100.0 degree C?
The specific heat of water = 4.18 J/g. degree C
16.0 Joules
160 Joules
66.9 Joules
669 Joule
[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]
669 J
Right option is D.
Step by Step Explanation:
[tex] \sf Mass \: of \: water(m) = 16g \\ \\ \sf Specific \: heat \: of water(C) = 4.18J/g \\ \\ \sf Change \: in \: temperature ( \triangle T) = 100 - 90 = 10{ \degree}C[/tex]
[tex] \sf \large \red{ Heat = mC\triangle T}[/tex]Now substituting the required values.
[tex] \sf \hookrightarrow Heat = 16 \times 4.18 \times 10 \\ \\ \sf \hookrightarrow Heat = 668.8(approx) \\ \\ \blue {\boxed { \hookrightarrow{Heat = 669J }}}[/tex]
Which sport is required to have both male and female competitors?
A. Water polo
B. Swimming
C. Hockey
D. Mixed doubles tennis
Answer:
D. Mixed doubles tennis
Explanation:
Mixed doubles tennis is just normal tennis but the 'mixed' means that on both teams there is both one man and one woman.
When the atoms that are transition elements form ions, the __ electrons are lost before the _electrons are lost.
Answer:According to the Aufbau principle, the electrons fill the 4s sublevel before beginning to fill the 3d sublevel. However, the outermost s electrons are always the first to be removed in the process of forming transition metal cations.
Explanation:hope its help
Name the following carboxylic acid:
COOH
A. 3-ethyl-2-methylheptanoic acid
B. 2-ethyl-1-methylhexanoic acid
The name of the compound is 2-methyl-3-ethylheptanoic acid.
Naming organic compoundsLooking at the structure, the longest carbon chain is 7. Meaning that the compound is a heptanoic acid.
There are 2 branches. The first one has a single carbon (methyl) while the second one has 2 carbons (ethyl).
The methyl is located on the second carbon (2-methyl) while the ethyl is located on the third carbon (3-ethyl) on the main chain.
Thus, the name of the compound would be 2-methyl-3-ethylheptanoic acid.
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Answer:its c 3-ehtyl
Explanation:
