Answer:
Melting poing is the temperature at which a solid changes to liquid under atmospheric pressure. Freezing point is the temperature at which liquid changes to solid under atmospheric pressure.
Elements are substances that are made from one type of atom. An element cannot be broken down into any other substance. ... Compounds are substances made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction.
Compounds are formed because of chemical bonding between two elements. Mixtures are formed when substances are physically mixed with one another. Compounds are basically of three kinds : Ionic, metallic and covalent
What is the compound that gives a white precipitate when treated with an aldehyde.
Answer:
Sodium hydrogen sulphite
Explanation:
The white precipitate formed is because of the sulphite ion and a carbonyl group formed
[tex].[/tex]
tính nồng độ Cm, Cn của dung dịch H2SO4 thu được khi pha loãng 10ml H2S04 0,1M thành 1 lít cho phản ứng với NaOH
Answer:
Jowhwbeejwieiebbej sssie ksihejwiiwb isjbeiis
What is true of an element that is oxidized?
It increased in electronegativity.
It decreased in electronegativity.
It gained electrons.
It lost electrons.
Answer:
When an element is oxidized, it loses electrons
Answer:
The last option is the correct answer.
Explanation:
When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. This is the basis of redox reactions.
However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons. Meanwhile, a reducing agent reduces something else, and gets oxidized in the process, losing its own electrons.
Did Chelate compounds increase the rate of reaction?
Answer:
Chelate, any of a class of coordination or complex compounds consisting of a central metal atom attached to a large molecule, called a ligand, in a cyclic or ring structure. An example of a chelate ring occurs in the ethylenediamine-cadmium complex:
The ethylenediamine ligand has two points of attachment to the cadmium ion, thus forming a ring; it is known as a didentate ligand. (Three ethylenediamine ligands can attach to the Cd2+ ion, each one forming a ring as depicted above.) Ligands that can attach to the same metal ion at two or more points are known as polydentate ligands. All polydentate ligands are chelating agents.
Chelates are more stable than nonchelated compounds of comparable composition, and the more extensive the chelation—that is, the larger the number of ring closures to a metal atom—the more stable the compound. This phenomenon is called the chelate effect; it is generally attributed to an increase in the thermodynamic quantity called entropy that accompanies chelation. The stability of a chelate is also related to the number of atoms in the chelate ring. In general, chelates containing five- or six-membered rings are more stable than chelates with four-, seven-, or eight-membered rings.
Explanation:
6.Observe the equation below 2 Fe2O3(s) + CO(g) Fe(s) + CO2(g)
i) Balance the equation
Answer:
the given equation is
Fe2o3+co-- Fe+co2
Balanced chemical equation is
Fe2o3 + 3co-- 2Fe+3co2
A metal has a density of 11.3 g/cm^3..
Answer:
2.2309
Explanation:
Density=Mass÷Volume
Volume=mass÷Volume
=23.210÷11.3
=2.2309
A student performs an experiment to determine the molar mass of magnesium oxide. The student repeats the experiment five times and collects the following data: 40.220gmol, 40.654gmol, 40.314gmol, 40.165gmol, and 40.554gmol. What is the relative standard deviation (RSD) for this set of data?
The relative standard deviation for the set of data obtained by the student is 0.470%
The formula for calculating the relative standard deviation is given below as:
Relative standard deviation (RSD) = (S * 100)/x
where S stands for the standard deviation and x is the mean of the data set.
The following are the steps to calculate to determine the relative standard deviation using the given formula:
Step 1: Calculate the mean of the numbers in the data set.
mean, x = sum of numbers / number of numbers
(40.220 + 40.654 + 40.314 + 40.165 + 40.554)/5
mean = 40.381 g/mol
Step 2: Subtract the mean from each number in the data to determine the deviation for each number and then square the deviations.
(40.220 - 40.381)² = 0.0259
(40.654 - 40.381)² = 0.0745
(40.314 - 40.381)² = 0.00449
(40.165 - 40.381)² = 0.0466
(40.554 -40.381)² = 0.0299
Step 3: Sum the squared deviations.
0.0259 + 0.0745 + 0.00449 + 0.0466 + 0.0299 = 0.181
Step 4: Determine the variance by dividing the sum of the squared deviations by the total number of values.
Variance = 0.181/5 = 0.0362
Step 6: Determine the standard deviation of the data by taking square root of the variance.
Standard deviation, S = √0.0362 = 0.190
Step 7: Determine the relative standard deviation by inserting the values in the formula, (RSD) = (S * 100)/x
RSD = (0.190 * 100)/40.381
RSD = 0.470%
Learn more at: https://brainly.com/question/475676
A rock has a volume of mban
mass of 60 grams. What is its density?
Answer: 60 g/mban
Explanation: I don't know what an "mban" is, but the density of this alien rock would be 60 grams/mban. Density = Mass/Volume
What pressure is greater, 14,500 kPa or 7.2 ATM?
What pressure is smaller 16,777 pa or 6 ATM?
How many ATM's are equal to 2375.4 kPa?
How many mm Hg are in 119.8 kPa?
Answer:
A) 14,500 kPa
B) 6 atm
C) 23.443 atm
D) 898.6 mmHg
Explanation:
Arrange the following aqueous solutions in order of increasing boiling points.
0.050 m Mg(NO 3) 2; 0.100 m ethanol; 0.090 m NaCl
a. Mg(NO3) < NaCl < ethanol
b. ethanol < Mg(NO3)2 < NaCl
c. ethanol < NaCl < Mg(NO3)2
d. NaCl < ethanol < Mg(NO3)2
e. Mg(NO3)2 < ethanol < NaCl
Answer:
The correct choice is option b. ethanol < Mg(NO3)2 < NaCl
Explanation:
Ethanol = 0.100 m
Mg(NO3)2 = 0.15 m
NaCl = 0.18 m
The molar concentration of NaCl is the highest, which is why its boiling point will be the highest, too.
How many grams of 40% (w/w) NaOH solution should be added to 600 g of water to obtain
10% (w/w) NaOH solution.
Explanation:
One mole of NaOH weighs 40gm.
Now 2M solution of NaOH indicates 2 moles of NaOH in 1 litre of water.
So the above question can now be simplified as …if one litre of water contains 80gm(2 moles) of NaOH, then how many grams of NaOH would 250ml solution of the same contain?
Using unitary method,
1000ml corresponds to 80gm NaOH…
1000/4 ml(250ml) corresponds to 80/4 gm NaOH…
Therefore, for 250ml of 2M NaOH, 20 gm of NaOH needs to be added to water.
Where is the moon located in relation to Earth and the sun when it is a first-quarter moon?
The first quarter moon occurs halfway between new moon and full moon.
What is First Quarter moon ?From our perspective, the moon is partially lighted and is 90 degrees away from the sun in the sky.
We refer to it as the "first quarter" since the moon has only circled the Earth once since the new moon.
From Earth, you can view one-quarter of the moon, or half of the moon's illuminated side, which seems to be one-half of a pie.
Therefore, The first quarter moon occurs halfway between new moon and full moon.
Learn more about Moon here ;
https://brainly.com/question/13538936
#SPJ2
Calculate the number of moles of carbon
atoms present in 2.9 g of ethanol (C2H6O)?
ANSWER IN MOL
Answer:
3.50 mol x 6.022 x 10^23
= 2.11 x 10^24 carbon atoms
Explanation:
1. moles = grams/molar mass
2. (mass nitrogen/mass amm sulfide)*100 = ??
3. mass Hg = volume x density
Then convert to moles.
Then remember there are 6.022E23 atoms for every mole.
Mrs. Marlow's class is conducting an investigation of a mixture of sand, iron filings, and salt. They were told that they must separate the mixture into pure sand, pure iron filings, and pure salt using only the physical properties of each component using the following supplies:
bar magnet
filter paper
plastic funnel
water
What is the BEST procedure for the students to follow in order to separate the mixture?
A mixture can be separated by looking at the physical properties of the components of the mixture.
Since salt is soluble in water, water can be added to the mixture to dissolve the salt.
The bar magnet is now introduced in order to remove the iron filings since they are attracted by a magnet.
The solution is filtered to separate the sand from the salt solution.
Lastly, the salt solution is heated to dryness to drive away the water and obtain the solid salt.
Hence the mixture has been separated into its components using their individual physical properties. Option A is the correct answer.
Learn more: https://brainly.com/question/12160179
Answer:
is it a b c or d
Explanation:
What is the order of macroscopic, submicroscopic, microscopic
Answer:
(from largest to smallest), macroscopic, microscopic, submicroscopic.
Explanation:
Explanation:
The correct order of these from largest to smallest is macroscopic, microscopic, and submicroscopic.
What is macroscopic?Macroscopic is a term used for things that can be easily seen by the eyes. They are of large size. Macroscopic are those items like rubber, mountains, a bottle, etc.
Microscopic items are those items that are minimum in size and can not be seen by eyes. They are seen by using microscopes. They are microorganisms, cells, cell organelle, etc.
Submicroscopic matters are those objects or substances that made up matter. They are present but can not be seen by eyes. They are electrons, protons, etc. so the correct order of them according to largest to smallest is macroscopic, microscopic, and submicroscopic.
Thus, the correct order is macroscopic, microscopic, and submicroscopic.
To learn more about macroscopic, refer to the link:
https://brainly.com/question/17329685
#SPJ2
Does the bubbling that occurs when the methanol is added to the dry sand indicate that the sand and methanol are reacting
It's in the last paragraph of this website.
https://community.ptc.com/t5/PTC-Mathcad/AP-Chemistry-Problem-Help/td-p/64410
The bubbling that occurs when the methanol is added to the dry sand indicate that there is no chemical reaction between sand and methanol rather it is just methanol displacing air between sand .
What is chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical reaction,here:
https://brainly.com/question/14929452
#SPJ2
what variables affect mass? (include observations)
Mass is a measure of inertia
The variable that affect mass of a body is the amount of matter present in the body
The reason for arriving at the above statement is as follows:
Mass is the property of a body that indicates the quantity of matter contained in the body and also a measure of the body's resistance to acceleration
In an experiment to determine the variables that affect mass, using a weight balance and paper clips, the observation is that as the quantity of the paper clips are increases on one side of the balance, the balance tilts lower on the side bearing the larger number of paper clips indicating a larger mass
Therefore, the variable that affect mass is the quantity of matter (material) present
Learn more about matter here:
https://brainly.com/question/22503269
89. The element bromine at room temperature is a liquid with a
density of 3.12 g/mL. Calculate the mass of 125 mL of bro-
mine. What volume does 85.0 g of bromine occupy?
The mass of 125 mL of bromine and the volume occupied by 85 g of bromine are:
1. The mass of bromine is 390 g. 2. The volume of bromine is 27.24 mL.Density is simply defined as the mass of an object per unit volume of the object. It can be expressed mathematically as
[tex]Density = \frac{mass}{volume }[/tex]
1. Determination of the mass of bromineDensity = 3.12 g/mL
Volume = 125 mL
Mass =?[tex]Density = \frac{mass}{volume} \\\\3.12 = \frac{mass}{125}[/tex]
Cross multiply
Mass = 3.12 × 125
Mass = 390 gTherefore, the mass of bromine is 390 g
2. Determination of the volume of bromineDensity = 3.12 g/mL
Mass = 85 g
Volume =?[tex]Density = \frac{mass}{volume } \\\\3.12 = \frac{85}{volume }[/tex]
Cross multiply
3.12 × Volume = 85
Divide both side by 3.12
[tex]Volume = \frac{85}{3.12}\\\\[/tex]
Volume = 27.24 mLTherefore, the Volume of bromine is 27.24 mL
Learn more: https://brainly.com/question/24460125
Use this Bohr Model to answer the questions below
Is sodium hypochlorite a element, compound or a mixture?
Answer:
Sodium hypochlorite (commonly known in a dilute solution as bleach) is a chemical compound with the formula NaOCl or NaClO, comprising a sodium cation (Na+) and a hypochlorite anion (OCl−or ClO−). It may also be viewed as the sodium salt of hypochlorous acid.which term best describes the role of hydrogen gas in the formation of a water molecule
A piece of metal with the mass of 254 g is placed in a 50.0 mL graduated cylinder. The water level rises from 25.0 mL to 46.5 mL, what is the density of the metal?
Density is simply defined as the mass per unit volume of a substance. Mathematically, it is expressed as:
[tex]Density = \frac{mass}{volume }[/tex]
To solve the question given above, we'll begin by calculating the volume of the metal. This can be obtained as follow:
Volume of water = 25 mL
Volume of water + metal = 46.5 mL
Volume of metal =?Volume of metal = (Volume of water + metal) – (Volume of water)
Volume of metal = 46.6 – 25
Volume of metal = 21.5 mLFinally, we shall determine the density of the metal. This can be obtained as follow:
Mass of metal = 254 g
Volume of metal = 21.5 mL
Density of metal =?[tex]Density = \frac{mass}{volume }\\\\Density = \frac{254}{21.5} \\[/tex]
Density of metal = 11.81 g/mLTherefore, the density of the metal is 11.81 g/mL
Learn more: https://brainly.com/question/19239648
Chlorine gas reacts with solid phosphorus to form phosphorus trichloride gas. Write a balanced chemical equation for this reaction.
Explanation:
First write down the basic chemical equation with the reactants and products,
[tex]\text{P}_4+\text{ Cl}_2\to\text{ PCl}_3[/tex]
Balancing the chemical equation*,
[tex]\text{P}_4 (s) + 6 \text{Cl}_2 (g) \to 4 \text{PCl}_3 (l)[/tex]
[tex]\color{blue}\text{Note: To balance any chemical equations, we should ensure the number of atoms of each elements are the same on both the product and reactant side.}[/tex]
[tex]\color{blue}\text{The phosphorous molecule has 4 P, but the }\text{PCl}_3\text{ molecule on the product side only has one P atom. Therefore, we need 4 }\text{PCl}_3\text{ molecules to balance.}[/tex]
[tex]\color{blue}\text{But that will mean we have }4\cdot 3=12\text{Cl atoms on the product side. So we need 6 }\text{Cl}_2 \text{ molecules on the reactant side.} [/tex]
omplete the following statement: A catalyst a. increases the activation energy. b. alters the reaction mechanism. c. increases the average kinetic energy of the reactants. d. increases the concentration of reactants. e. increases the collision frequency of reactant molecules.
Ammonium carbonate solution is added to dilute nitric acid. What is the balanced chemical equation?
20,000 $ give a way but answer this first
Plz
12.Write the basis of naming of the following elements. 1.Neptunium,2.Mendelevium,
Answer:juhygjdkeExplanation:
Mendelevium is named for Dmitri Mendeleev who produced one of the first periodic tables.
Abelson first found neptunium in 1940 after uranium had been bombarded by neutrons from the cyclotron at Berkeley, California. ... The element was named after the planet Neptune, which is the first planet beyond Uranus.
Answer in explanation
Explanation:
neptunium was named after the discovery of the planet neptune in september 23 1846
mendelevium was named as dimitri mendeleev
How many significant figures are contained in the quantity 14.00 mL?
Answer:
4
Explanation:
How has technology impacted creative expression over the last 100 years? What has changed? Where is it leading, what's next?
Explanation:
As technology advances with time, it also enhances people's creativity. ... People are able to constantly search things and discover new information they didn't know before. It allows us to become educated and have an outlet to speak our mind
Which crop grows in a climate that is fairly dry and hot in summer, but cold in winter and quite flat? A. Coffee D. Wheat B. Rice E. rubber C. Cocoa
Answer:
b
Explanation:
well I really don't remember but I think it's b
Why do scientists classify organisms?
A It places organisms into groups which proves to be slower/takes more time.
B It makes them easier to study.
We're bringing Latin back.
D It complicates things.
Answer:
B
Explanation:
Please give brainliest
