A chemist is called by the highway patrol to identify a clear colorless liquid that was spilled on the freeway. The test chemist could do to identify whether the liquid is a mixture or a substance is melting point.
If it is to be identified that whether a liquid is a mixture or a pure substance, testing the melting point is preferably considered.
Melting point is a a range of temperature of a substance from which the first crystal starts melting.
Pure substances have sharp melting point but an impure substance or a mixture melts over a given range of temperature.
By looking at the overall composition, pure substance and mixture can be identified visually but it is quite difficult in case of a clear, colorless liquid.
Therefore, melting points can be used to find out whether a liquid is a mixture or a substance.
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Question 5
4.5 pts
Number of lons and Formula Units (lonic Compounds)
Part 1: Consider a sample that contains 0.32 mol Na2SO4 dissolved in water. How
many sodium ions are there in the solution? Enter the answer with correct
significant figures:
Nations.
Part 2: Given that the molar mass of Na₂SO4 is 142.05 g/mol, what is the mass of
0.32 mol Na2SO4 dissolved in the solution? Enter the answer with correct
significant figures:
The no. of sodium ions present in the solution are found to be 3.85×10²³.
1 mol Na₂SO₄ contains 2 mol na+ ions then ions contains by 0.32 mol na₂SO₄ is given by 0.32× 2 = 0.64 na+ ions.
Since 1 mol of na+ ions Avogadro no. Of ions that is 6.022×1023.
So, 0.64 na+ ions contains 6.022×10²³× 0.64 = 3.85×1023.
Thus the solution contains 3.85×10²³ na⁺ ions.
Now, we calculate the mass of 0.32 mol Na₂so₄.
We know that mass of one mol of Na₂SO₄ is equal to molar mass, that is 142g.
Then, the mass of 0.32 mol Na₂so₄ is calculated as 0.32× 142 = 45.45grams.
A chemical compound’s molar mass is calculated by dividing its mass by the number of moles measured in moles that make up the sample of the compound.
The proportionality factor that connects the quantity of substance in a sample to the number of constituent particles in that sample is called the Avogadro constant. The reciprocal mole, which is its SI unit, is defined precisely as NA = 6.02214076×10²³ mol⁻¹.
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A block of metal has a volume of 14.0in3 and weighs 5.16 lb .
What is its density in grams per cubic centimeter?,
The density of metal block in grams per cubic centimeter is 10.70 g/cm³.
Given,
Mass of metal block = 5.16 lb
1 lb = 453.592 g
5.26 lb = 2340.536 g
The volume of metal block = 14 in 3
1 in = 2.5 cm
1 in 3 = 15.625 cm³
14 in 3 = 218.75 cm³
Density is defined as the mass per unit volume of a substance. Or, it is the ratio of mass to the volume of the substance.
As we know,
Density = mass/volume
Or, density = 2340.536 / 218.75
Or, density = 10.70 g/cm³
Therefore, the density of the metal block is 10.70 g/cm³.
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Please help
19.0 kg/0.021 m^3
Answer:
904.8 kg / m3
Explanation:
19.0 kg/0.021 m^3 = 904.761905 kg / m3
Objects get their colors from reflecting only certain wave lengths when hit with white light. Light reflected from a green leaf is found to have a wavelength of
[tex]4.90 \times 10^{ - 7} m[/tex]
What Is the frequency of the light ?
Answer:
black
Explanation:
An object which absorbs all wavelengths of visible light will appear black, and one which absorbs none will appear white.
You have a solution of 0.250 M NaCl. If you boil away 2/3 of the volume of water, what is the concentration of this solution in moles?
The concentration of this solution in moles is 0.75 M.
What is concentration of a solution?
The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
Mathematically. concentration is given as;
C = n/V
where;
n is the number of molesV is the volume of the solutionC is concentrationAt a constant number of moles;
C1V1 = C2V2
When you boil away 2/3 volume, the new volume becomes 1/3
So V1 = V
V2 = 1/3V = 0.3333V
Substitute the given parameters and solve for the new concentration.
C2 = (C1V1)/V2
C2 = (0.25 x V) / (0.3333V)
C2 = 0.75 M
Thus, the concentration of this solution in moles is 0.75 M.
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How many grams are in 4.35 moles of Ar?
Convert 0.063 mol of helium to grams
Answer:
0.25 grams He
Explanation:
To find the mass (grams), you need to multiply the given mole value by the atomic mass of helium. The atomic mass exists as a ratio which compares the mass of an element per every 1 mole. It is important to arrange this ratio in a way that allows for the cancellation of units (grams should be in the numerator in this case). The final answer should have 2 sig figs like the given value (0.063 = 2 sig figs).
Atomic Mass (He): 4.0026 g/mol
0.063 moles He 4.0026 grams
---------------------------- x -------------------------- = 0.2521638 = 0.25 grams He
1 mole
Convert 7.27 m^3 to ft^3
256.73 ft
Convert 7.27 [tex]m^3[/tex] to[tex]ft^3[/tex]
as per above , we have to convert [tex]m^3[/tex] into [tex]ft^3[/tex]
now:
1 [tex]m^3[/tex] = 35.31 [tex]ft^3[/tex]
7.27 [tex]m^3[/tex] = 35.31 [tex]\times[/tex] 7.27 [tex]m^3[/tex]
= 256.73 ft
meter cubic and feet both are volumetric unit
Volume is the amount of space an object take upV = Length x Wide x Height is the formula to find the volume of a regular shaped object or 3 dimensional objectCubic Feet is the Volume of a cube is one foot on each sideCubic Meteris the Volume of a cube is one meter on each side.To know more about Volume visit :
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Hydrogen reacts with chlorine according to
the equation:
H₂(g) + Cl₂(g) → 2HCl(g)
What is the total volume of gas present in
the container at the end of the experiment if
100 cm³ of hydrogen is reacted with 200 cm³
of chlorine?
When the total number of reactants and products are the same in the reaction it is called a balanced chemical equation. The balanced chemical equation of H2+ Cl2 → 2HCl(g)
What is a balanced chemical equation?When the total number of reactants and products are the same in the reaction it is called a balanced chemical equation. In the given reaction one mole of 70 g of hydrogen reacts with 2 moles of Cl.
100 g of chlorine reacts with 2/ 70 * 100 = 2.86 gram of hydrogen.
70 grams of chlorine will produce 73 g of HCl.
100 gram of chlorine produce 73/ 70 * 100 = 104.28 g of HCl.
Therefore, When the total number of reactants and products are the same in the reaction it is called a balanced chemical equation. The balanced chemical equation of H2+ Cl2 → 2HCl(g).
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Perform calculations to determine the amount of 50.0 mM Ca(NO3)2 needed to prepare 20.0 mL of 5.00 mM Ca(NO3)2. Perform calculations to determine the amount of 5.00 mM Ca(NO3)2 needed to prepare 20.0 mL of 1.00 mM Ca(NO3)2. Perform calculations to determine the amount of 1.00 mM Ca(NO3)2 needed to prepare 20.0 mL of 0.250 mM Ca(NO3)2.
The required volumes are;
1) 2 mL
2) 4 mL
3) 5 mL
What is the amount needed?Now we know that the dilution formula can be used to obtain the quantity of a solution that could be used in the preparation of another by the use of serial dilution. In this case, we can see that an aliquot of the solution is taken and then made up to mark in order to obtain the concentration that we require as we are trying to carry out the process of the serial dilution.
Now let us try to see how we can be able to prepare the solutions that are required as follows;
To prepare 50mM of of calcium nitrate;
C1V1= C2V2
C1 = initial concentration’
V1 = initial volume
C2 = final concentration
V2 = final volume
C1 = C2V2/C1
C1 = 20.0 mL * 5.00 mM/50mM
C1 = 2 mL
2) 20.0 mL * 1.00 mM/ 5.00 mM
= 4 mL
3) 20.0 mL * 0.250 mM/1.00 mM
= 5 mL
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How many O atoms are present in sodium chlorate?
6
1
3
4
none of the above
Answer:
3.
Explanation:
Sodium chlorate has the formula NaClO3. We know this because sodium is Na, chlorine is Cl, and because of naming rules. When a compound ends in -ate, it has 3 oxygen atoms. This is the naming rule list with chlorine as the example:
perchlorate: 4 O atoms
chlorate: 3 O atoms
chlorite: 2 O atoms
hypochlorite: 1 O atom
A nurse decides to move from England to India. The nurse currently makes 46,800
Euros as their annual salary. How much is this salary in Indian Rupees every month?
The conversion factor you will need is: 1 Euro = 95.12 Indian Rupees
Indian Rupees per month.
The nurse's salary will be
A nurse decides to move from England to India. The nurse currently makes 46,800 Euros as their annual salary. in Indian Rupees every month the nurse's salary will be Rs. 3,70,968
Let us Consider the following given data
The Nurse current salary is 46,800 Euros
We have to find 1 month's salary of the annual .
We know that one year contains 12 months .
Therefore 1 month's salary = 46,800/12
=3,900 euros per month
To find: The nurse's salary every month in Indian rupee
1 Euro = Rs. 95.12
= 3,900 ×Rs.95.12
= Rs. 3,70,968 ( three lakh seventy thousand nine hundred sixty eight rupees in Indian currency .)
The nurse's salary in Indian rupees per month is 3,70,968 rupees
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increasing energy of the molecules of the
Answer:
If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. If the volume is held constant, the increased speed of the gas molecules results in more frequent and more forceful collisions with the walls of the container, therefore increasing the pressure (Figure 1).
Perform the following operations and express the answers in scientific notation SHOW YOUR WORK (Part 2):
1) (3.67*10^2)-(1.6*10^1)
2) (8.41*10^-5) - (7.9*10^-6)
3) (1.33*10^5)-(4.9*10^4)
Taking into account the scientific notation, you obtain:
3.67×10² - 1.6×10¹= 3.51×10² 8.41×10⁻⁵ - 7.9×10⁻⁶= 7.62×10⁻⁵1.33×10⁵ - 4.9×10⁴= 0.84×10⁵Scientific notationScientific notation is a quick way to represent a number using powers of base ten and the numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Subtraction in scientific notationYou want to subtract two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent.
Taking the quantities to the same exponent, all you have to do is substract what was previously called the number "a". In this case:
In this case:
3.67×10² - 1.6×10¹= 3.67×10² - 0.16×10²= (3.67 -0.16)×10²= 3.51×10² 8.41×10⁻⁵ - 7.9×10⁻⁶= 8.41×10⁻⁵ - 0.79×10⁻⁵= (8.41 -0.79)×10⁻⁵= 7.62×10⁻⁵1.33×10⁵ - 4.9×10⁴= 1.33×10⁵ - 0.49×10⁵= (1.33 - 0.49)×10⁵= 0.84×10⁵In summary, you obtain:
3.67×10² - 1.6×10¹= 3.51×10² 8.41×10⁻⁵ - 7.9×10⁻⁶= 7.62×10⁻⁵1.33×10⁵ - 4.9×10⁴= 0.84×10⁵Learn more about operations in scientific notation:
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A rectangular painting has an area of 2890square centimeters. What is its area in square inches? Round to the nearest square inch. Do not include the units in your answer.
The area of the rectangular painting which is 2890 square centimeters is equivalent to 447.95 square inches
How to convert cm² to in²?Square inch (in²) is a unit of area equal to the area of a square the sides of which are each one inch long.
Square centimeter (cm²) is another unit of area equal to that of a square of sides 1 centimeter.
The conversion factor of square centimeter to square inches is as follows:
1 square centimetre = 0.155 square inch
2890 square centimeters = 447.95 square inches
Therefore, the area of the rectangular painting which is 2890 square centimeters is equivalent to 447.95 square inches.
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What is the impact of operating a water slide on the environment?
A recreational slide that has water running down it to lessen friction, sometimes requiring the user to sit on a mat or raft, and occasionally ending in a pool.
What is a water slide ?In Faribault, Minnesota, lived Herbert Sellner. His career as a designer began with the creation of furniture, followed by the design of children's toys and, most notably, the Water-Toboggan Slide. The slide, constructed in 1923, was a wooden sled that guests could sit on and ride down an incline into a lake.
They are usually constructed from thick, durable PVC or vinyl and nylon, and are inflated using a blower that is either electric or gasoline-powered. To create the water supply, a water hose is connected to the water slide.Learn more about Water slide here:
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o Convert 6.49 x 10-3 m to the equivalent length in nanometers.
Remember that 1 nanometer is equal to 1 x 109, therefore multiply 6.49 x 10-3 m by 1 x 109 to get the answer. The correct response is 6.49 x 10-3 m = 6.49 x 106 nm.
What are nanometers used for?
The measuring unit known as a nanometer (NM) is one billionth of a meter. It is frequently used as a scale for creating intricate, atomic-scale parts, particularly in nanotechnology.
What dimension does a nanometer have?
How tiny is "nano" exactly? One nanometer is one billionth of a meter since the prefix "nano" in the International System of Units refers to one billionth, or 10-9. Here are some samples to help you visualize how little that is: About 100,000 nanometers make up a sheet of paper.
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2. (01.01 HC)
Describe the role of consumers in a food web. Are consumers heterotrophs? Justify your answer. (7 points)
Yes the all types of the consumers are the heterotrophs.
What role play the consumers in a food web? Are consumers heterotrophs?
The consumers play a very important role in the ecosystem of the earth by maintaining the population and growth to the organism of the ecosystem. If we remove the consumer or either the producer then the whole system of the ecosystem will be destabilize, and thus the ecosystem can survive from the overpopulation problem and lack of food problem. The other organism can transfer energy to the consumer.
Both the primary (herbivores) and as well as the secondary (carnivores and omnivores) consumers are heterotrophs.
So we can conclude that yes the all types of the consumers are the heterotrophs.
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Determine the name for each of the ionic compounds from their formulas.
Be(NO₂)₂
NiPO4
Answer:
To find the formula of an ionic compound, first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge. Finally, combine the two ions to form an electrically neutral compound.
Explanation:
Write a balanced molecular equations for the reaction between aqueous lead(II) perchlorate and aqueous sodium chloride. Include phase symbols.
Answer:
Pb(ClO₄)₂ (aq) + 2 NaCl (aq) -----> 2 NaClO₄ (aq) + PbCl₂ (s)
Explanation:
This chemical reaction is a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another.
So, lead (II) (Pb²⁺) from lead (II) perchlorate (Pb(ClO₄)₂) will be swapped with sodium (Na⁺) from sodium chloride (NaCl). When creating the new compounds, there may need to be more than one ion of a particular type in order to make the overall compound neutral.
An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these amounts are unequal, you can add coefficients to modify the quantities of particular compounds.
The unbalanced reaction:
Pb(ClO₄)₂ (aq) + NaCl (aq) -----> NaClO₄ (aq) + PbCl₂ (s)
Reactants: 1 lead, 3 chlorine, 8 oxygen, 1 sodium
Products: 1 lead, 2 chlorine, 4 oxygen, 1 sodium
The balanced reaction:
Pb(ClO₄)₂ (aq) + 2 NaCl (aq) -----> 2 NaClO₄ (aq) + PbCl₂ (s)
Reactants: 1 lead, 4 chlorine, 8 oxygen, 2 sodium
Products: 1 lead, 4 chlorine, 8 oxygen, 2 sodium
Consider the following ions: NO2− , CO32− , and ClO4− . For each of these, you should use a Lewis structure that satisfies the octet rule. Which of these ions will exhibit resonance among multiple equivalent Lewis structures that satisfy the octet rule?
All the species mentioned do have resonance structures.
What is the Lewis structure?The Lewis structure is an arrangement that shows the number of electrons that are attached to each of the atoms in a compound. In this case, the structure consists of the symbol of the elements and the number of electrons pairs of or odd electrons attached to the element.
Sometimes, a single Lewis structure is insufficient when discussing the properties of a compound. We must then invoke a number of structure which we call the resonance structures.
The the species mentioned in the question do have resonance structures that are obtained by satisfying the octet rule as shown in the images attached to this answer.
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PLEASE HELP THIS IS IMPORTANT!!! I WILL MARK BRAINLIEST
Which plate boundary and movement commonly create volcanoes that can result in the development of habitable islands? Explain how islands can be created by plate tectonics.
PLEASE MAKE ANSWER SIMPLE AND I WILL GIVE LOTS OF POINTS AND MARK BRAINLIEST
Answer:Which plate boundary and movement commonly create volcanoes that can result in the development of habitable islands?
Sometimes, the plates collide with one another or move apart. Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries
Explain how islands can be created by plate tectonics.
Explanation: These hot spots are able to independently melt the tectonic plate above them, creating magma that erupts onto the top of the plate. In hot spots beneath the ocean, the tectonic activity creates a volcanic mound. Over millions of years, volcanic mounds can grow until they reach sea level and create a volcanic island.
Theories, which often can include models, may
be modified but are rarely discarded completely.
How does the geocentric and heliocentric
models of the solar system demonstrate this?
The way in which theories and models may be modified but are rarely discarded completely is shown in the geocentric and heliocentric models of the solar system are the fact that similar assumptions were made, but the main difference is the position of the earth and the sun.
What is the Geocentric Model of the Solar System?This refers to the theory of the solar system that is based on the assumption that the earth is the center of the universe and the planets and sun move around it
What is the Heliocentric Model of the Solar System?This refers to the theory of the solar system that is based on the assumption that the sun is the central point of the universe and the planets and sun move around it
Hence, The way in which theories and models may be modified but are rarely discarded completely is shown in the geocentric and heliocentric models of the solar system are the fact that similar assumptions were made, but the main difference is the position of the earth and the sun.
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The rate of effusion of NH3 is 2.40 mole/min. What would be the rate of effusion of He under the same conditions?
The rate of effusion of helium under same conditions as that of ammonia is 4.897 mole/min.
Rate of effusion of ammonia is 0.49 times the effusion of helium.Thus, to find out effusion of helium ,effusion of ammonia is divided by 0.49.
Thus, effusion of helium=effusion of ammonia/0.49
=2.40/0.49
=4.897 mole/min.
What is rate of effusion?Effusion relates to the ability of gas to travel through a small opening.Rate of effusion of a gaseous substance is inversely proportional to square root of it's molar mass.The relationship between molar mass and rate of effusion is called Graham's law.
Effusion rate directly depends on the average velocity with which a particle moves.Higher the velocity of particles,higher is the effusion rate.
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Write the reaction occurring at anode and cathode and the products of
electrolysis of aq KCl.
Answer:
4OH-→ 2H²O(l) + O² + 4e- (Anode)
2H+ → H²O (l) + 2e- (Cathode)
Explanation:
OH- ions are preferentially discharged at the anode since they have a less positive electrode potential (+0.40V) then chloride ions (+1.36)
H+ ions are preferentially discharged at the cathode since they have a less negative standard electrode potential (0.00) than Potassium (-2.92)
Fluorine,chlorine and bromine which one has the strongest base
Fluorine has the strongest base among fluorine, chlorine and bromine.
Fluorine belongs to the group of halogens. It is represented with the letter F and has an atomic number 9. Fluorine is the smallest element among the halogens and hence its electrons are attached very strongly with the nucleus. As a result, fluorine has the most tendency to accept electron to complete its valence shell and therefore is the strongest base.
Bases are the molecules or ions that can accept electrons to complete their outer valence shell. This justifies fluorine being the strongest base among halogens. Bases are generally bitter in taste, with a soapy touch. A pH above 7 specifies basicity.
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HELP!!
Calculate the heat absorbed by 50.00 g of iron when its temperature is raised from 10.00 0 C to 60.00 C. The specific heat of iron is 0.449J/g C.
Heat absorbed by 50 g of iron is 898 Joule.
Heat transfer between two bodies, which can take place through conduction, convection, or radiation, is referred to as heat absorption.
Specific heat - The amount of heat needed to raise a substance's temperature by one degree Celsius in one gram, also known as specific heat. The units of specific heat are usually expressed in terms of calories or joules per gram per degree Celsius. The specific heat of water, for instance, is 1 calorie (or 4.186 joules) per gram per degree Celsius.
The formula of specific heat-
q = mc ΔT
where Q is heat absorbed, m is mass and ΔT is change in temperature.
m = 50 g
c = 0.449 J/g C
ΔT = 60 - 10
= 40 °C
∴q = 50 x 0.449 x 40
q = 898 J
Hence, heat absorbed by 50 g of iron is 898 Joule.
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What variable determine the amount of kinetic energy an object has
A medication is available in doses of 32.0 mg/mL.
What mass of the medication in g is administered
when a patient takes 28.6 mL? Round your final
answer to three places after the decimal.
Answer: 0.9152 g
Explanation:
32.0 mg/mL=
32.0/1000 g/ml=0.032 g/ml
0.032 g/ml*28.6 ml=
0.9152=0.9152 g
What is the mass grams that are in 2.57 × 10¹⁵ molecules of CO?