Sublimation cannot be used to separate a mixture of salt and sand.Give reason.
Answer:
because salt cannot be changed into gas by heating.
Answer:
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase. Explanation: sand and salt can not be separated through the method of sublimation because none of the two can show sublimation(even when heated).
Explanation:
A tire pressure gauge reads 33.0 pounds per square inch. How many kPa is this?
Answer:
227.5kpa
Explanation:
Tyre pressure is the air pressure present in the tubes of the tires to maintain the grip and movement. The tire pressure gauge will be 227.527 kPa.
What are pascal and pSI?
Pascal is the SI unit of the air pressure and hydraulic pressure, whereas the pounds per square inch is the imperial unit of the air pressure measurement.
We know, that 1 (PSI) pounds per square inch are equivalent to 6,895 Pa. Then, 33 PSI will be:
[tex]33 \times 6,895 = 227,527.08 \;\rm Pascals[/tex]
If one kilopascal contains 1000 pascals, therefore, 227,527.08 Pa contains,
[tex]\dfrac{ 227,527.08}{1000}= 227.527 \;\rm kPa[/tex]
Therefore, 227.527 kPa is equivalent to 33 PSI.
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Select all the correct answers.
What are the characteristics of prokaryotes?
A prokaryote lacks a well-defined nucleus.
A prokaryote cannot perform basic life functions.
A prokaryote lacks cell organelles.
A prokaryote is larger than a eukaryote.
eu vou colocar V(verdadeiro) F (falso)
1:F
2:F
3: V
4:F
explicação:
1 procariontes não apresentam núcleo
2 eles podem sim caso contrário os seres procariontes não sobreviveriam
3 ele possui organelas celulares
4 as células eucariontes são maiores e mais complexas.
CONCLUSÃO: a resposta certa é a 3
What is the mass of 4.99×1021 platinum atoms?
Answer:
[tex]\boxed {\boxed {\sf 1.62 \ g \ Pt}}[/tex]
Explanation:
We are asked to find the mass of a number of platinum (Pt) atoms.
1. Convert Atoms to MolesFirst, we convert atoms to moles using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are platinum atoms.
We will convert using dimensional analysis so we set up a ratio using the information we know (6.022 × 10²³ platinum atoms in 1 mole of platinum).
[tex]\frac {6.022 \times 10^{23} \ atoms \ Pt}{ 1 \ mol \ Pt}[/tex]
We are converting 4.99 ×10²¹ atoms of Pt to moles of Pt, so we multiply by this value.
[tex]4.99 \times 10^{21} \ atoms \ Pt *\frac {6.022 \times 10^{23} \ atoms \ Pt}{ 1 \ mol \ Pt}[/tex]
Flip the ratio so the units of atoms of platinum cancel.
[tex]4.99 \times 10^{21} \ atoms \ Pt *\frac { 1 \ mol \ Pt}{6.022 \times 10^{23} \ atoms \ Pt}[/tex]
[tex]4.99 \times 10^{21} *\frac { 1 \ mol \ Pt}{6.022 \times 10^{23}}[/tex]
[tex]\frac { 4.99 \times 10^{21}}{6.022 \times 10^{23}} \ mol \ Pt[/tex]
Divide.
[tex]0.008286283627 \ mol \ Pt[/tex]
2. Convert Moles to GramsNext, we convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. This is found on the Periodic Table because it is equivalent to the atomic mass, but the units are grams per mole instead of atomic mass units. Look up platinum's molar mass.
Pt: 195.08 g/molSet up another ratio using this new information (195.08 grams of Pt in 1 mole of Pt).
[tex]\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}[/tex]
Multiply by the number of moles we just calculated.
[tex]0.008286283627 \ mol \ Pt*\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}[/tex]
The units of moles of platinum cancel.
[tex]0.008286283627*\frac {195.08 \ g \ Pt}{ 1 }[/tex]
[tex]0.008286283627* {195.08 \ g \ Pt}[/tex]
[tex]1.61648821\ g \ Pt[/tex]
3. RoundThe original measurement of atoms ( 4.99 ×10²¹ ) has 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 6 in the thousandth place tells us to round the 1 up to a 2.
[tex]1.62 \ g \ Pt[/tex]
There are approximately 1.62 grams of platinum in 4.99 ×10²¹ atoms of platinum.
Correct answers only please
Answer:
Delta. Aldehyde
Explanation:
How many molecules are present in 2 H₂ SO4
Answer:
1 mol of H2SO4 contains 6.022 x 10^23 molecules. : 0.5 mol of H2SO4 contains 0.5 x 6.022 x 10^23 molecules. = 3.011 x 10^23 molecules . that is 49 g of H2SO4 contains 3.011 x 10^23 molecules of H2SO
Explanation:
Someone help answer this for me tysm
Answer:
Energy, Kinetic, Potential
Explanation:
Kinetic and Potential is energy
Kinetic is energy in motion and Potential is stored motion.
Please help me please
Answer:
Sugar solution seperation method is Distillation
iron power and sand separation method is Magnetic separation
Petrol and diesel separation method is Fractional Distillation
Camphor and glass powder seperation method is Sublimation
I hope this will have you
have a great day
What is an atomic number
Answer:
the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place on the periodic table
How many joules are equivalent to 450 calories?
Answer:
Below
Explanation:
To convert calories to joules, you need to multiply the value by 4184
450 x 4184 = 1882800 J
If your teacher requires you to round to significant figures, you would round to 2 sig figs as 450 only has 2 sig figs
450 x 4184 = 1.9 x 10^6
Hope this helps! Best of luck <3
Al saltar una persona del Bungee se observa que las cuerdas con las que se sujeta muestran un
grado de estiramiento por el peso y la velocidad que alcanza, una vez que ya no hay movimiento,
las cuerdas retoman su forma original. ¿Qué propiedad física se presenta?
La propiedad física es la elasticidad.
La elasticidad es la capacidad de un material para extenderse cuando está bajo la acción de una fuerza de estiramiento y volver a su forma original cuando se elimina la fuerza de estiramiento.
Cuando la persona que salta sostiene el bungee, se encuentra que se estira y vuelve a su forma original cuando no hay más movimiento. El bungee puede considerarse elástico.
Este es un ejemplo de la propiedad física llamada elasticidad.
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(giving brainlist! What should a simplified model of a large molecule like glucose show?
Glucose is a carbohydrate and monosaccharide sugar molecule that is the energy source for organisms. The simplified model of a glucose molecule will show six carbon atoms, six oxygen atoms, and twelve hydrogen atoms.
What is glucose?Glucose is one of the monosaccharide sugar that is the most abundant energy source with a molecular formula of C₆H₁₂O₆. It consists of carbon, hydrogen, and oxygen atoms with a molecular mass of 180.156 g/mol.
It is a sugar-containing aldehydic group with a six-carbon making it aldohexoses. It is found in honey and fruits that are the source of the energy and regulates metabolic and cellular reactions.
Therefore, the molecular structure of glucose contains six carbon, twelve hydrogens, and six oxygen atoms.
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Perform each calculation to the correct number of significant figures.
(a) 89.3 * 77.0 * 0.08
(b) (5.01 * 105) , (7.8 * 102) (c) 4.005 * 74 * 0.007
(d) 453 , 2.031
Answer:B
Explanation:
Find the volume of 1760 grams of copper
Answer:
(1760 ÷ 64) x 24.4 =671dm^3
1.Volume of liquid in
a. 10 mL graduated cylinder
How many significant figures in this measurement?
Answer:
1 significant figure.
Explanation:
Since 10 does not have any decimals in it, we count the zeros from right to left. Doing this leaves us with one sig fig.
Substance A is a gas, Substance B is a liquid and Substance C is a solid. All of the substances are at the same temperature and pressure. Which of the following shows the correct relationship of the strength of the intermolecular forces in each substance?
Answer:C
Explanation:
What is photosynthesis ?
[tex] \huge \boxed{\mathfrak{Question} \downarrow}[/tex]
What's photosynthesis?[tex] \large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}[/tex]
Photosynthesis is the process in which green plants derive their food (nutrients and water) through the capturing of light energy (sunlight) and using it to convert carbon dioxide (CO2) and water (H2O) into oxygen (O2) and other substances (compounds) that are rich in energy. Chlorophyll a green pigment present in plants is used in this process.
__________________
Formula ⟶ [tex]\boxed{\bf\:6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2} [/tex]
__________________
So, the products of photosynthesis are [tex]\large\boxed{\boxed{\bf\:C_6H_{12}O_6 + 6O_2}}[/tex]
Which of the following are exact numbers? (Check all that apply.)
1000 meters in one kilometer.
The diameter of a coin, 10.2756mm (millimeters)
A dozen eggs.
16 ounces in 1 pound.
The length of a pen, 12mm (millimeters)
For the given options we found that the following are examples of exact numbers:
1000 meters in one kilometer is an exact numberA dozen eggs is an exact number. 16 ounces in 1 pound is an exact number.To find which of the given examples are exact numbers, we need to recall its definition. In simple words, an exact number is a number that can be counted without uncertainties, usually is an integer one.
A number that is determined with uncertainties with a finite number of significant digits or thought an instrument is not an exact number (is a measured one).
Now, let's evaluate each option.
a) 1000 meters in one kilometer
This is an exact number because we know for certain that in 1 kilometer there are 1000 meters. All the conversion of units like meters to kilometers, grams to kilograms are examples of exact numbers.
b) The diameter of a coin, 10.2756 mm
This is not an exact number, because the diameter found has a finite number of significant digits, which means that the measurement has an uncertainty in the final decimal position. Also, this diameter was found with an instrument.
c) A dozen eggs
A dozen is a number that can be counted with certainty, so it is an exact number.
d) 16 ounces in 1 pound
This is like example "a". Since we know for sure that in 1 pound we have 16 ounces, this is an exact number.
e) The length of a pen, 12 mm
Although the number 12 mm is an integer, this is not an exact number because this dimension was measured. We do not know for sure that the dimension of a pencil is 12 mm, we can not count it.
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Why do other elements need to bond with one another?
Answer:
Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it.
Answer:
In order for that element to gain stability
4. Select the measurement that is consistent with the uncertainty of each instrument.
(a) METRIC RULER A: 10 cm, 10.0 cm, 10.00 cm
(b) METRIC RULER B: 10 cm, 10.0 cm, 10.00 cm
(c) decigram balance: 10.0 g, 10.00 g, 10.000 g
(d) centigram balance: 10.0 g, 10.00 g, 10.000 g
(e) milligram balance: 10.0 g, 10.00 g, 10.000 g
(f) graduated cylinder: 10 mL, 10.0 mL, 10.00 mL
(g) Celsius thermometer: 10 °C, 10.0 °C, 10.00 °C
The correct measurements has an uncertainty of ±0.01.
What is the metric system?The metric system of measurement is a system of measurement that makes use of the meter, litre and gram as units. With every measurement, there is a level of uncertainty.
The uncertainly that goes with each measurement usually lies between ±0.01. Hence the correct measurements has an uncertainty of ±0.01.
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Calculate the percentage of limestone that dissolved from each solution. Start by subtracting the final mass from the initial mass. Divide that number by the initial mass. Then multiply the result by 100 to make it a percent. Use this formula:
% dissolved= initial mass- final mass/ initial mass x 100
ORIGINAL: 0% Acid 33% Acid 66% Acid 100% Acid
Initial Mass (g) 10.0 10.1 10.0 9.9
Final Mass (g) 10.0 10.0 9.8 9.5
Record the percentage of limestone dissolved in each acid concentration.
Look at attched...
9514 1404 393
Answer:
see attached
Explanation:
It works nicely to let a spreadsheet do the calculations described in your problem statement.
You don't actually have to multiply by 100 to make the number a percent. Spreadsheets have the capability to show a value as a percentage just by changing the format.
50 POINTS!!!! What is the approximate amount of the leftover reactant?
O 8.2 g of sulfuric acid
O 9.8 g of sulfuric acid
0 11.43 g of aluminum hydroxide
O 13.76 g of aluminum hydroxide
Answers: The answer is A
Explanation:
correct me if I'm wrong
Calculate the number of kilograms of sodium fluoride needed per year for a city of 100,000 people if the daily consumption of water per person is 150.0 gallons.
Fluoridation is the process of adding fluorine to drinking water to avoid tooth decay.
The question is incomplete; the complete question is;
Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons.
(Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon = 3.79 L; 1 year = 365 days; 1 ton = 2000 lb; I lb = 453.6 g; density of water = 1.0 g/mL.)
The quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons is [tex]9.32 * 10^9 Kg[/tex].
From the question, we know that;
Daily consumption of water per person = 150 gallons.
Population of the city = 100,000 people
Total daily city consumption =[tex]100,000 * 150 gallons = 15 * 10^6 gallons[/tex]
Annual water consumption = [tex]15 * 10^6 gallons * 365 = 5.475 * 10^9 gallons[/tex]
1 gallon = 3.785 L = 3.785 kg
[tex]5.475 * 10^9 gallons = 5.475 * 10^9 gallons * 3.785 kg/ 1 gallon = 2.1 * 10^10 Kg[/tex]
Since sodium fluoride accounts for 45% by mass of water
Mass of sodium fluoride= [tex]0.45 * 2.1 * 10^10 Kg= 9.32 * 10^9 Kg[/tex]
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Difference between hydrocarbons and organic compounds
Answer:
hydrocarbons contain both Hydrogen and Carbon while organic compounds
are compounds in which one or more atoms of Carbon are covalently linked
with other elements
Explanation:
Please mark me as brainiest
Which part of the atom cannot have its location accurately determined and is modeled by a cloud around the center of the
atom?
Answer:
the electron
Explanation:
Would overheating be a stimulus or a
response?
Stimulus
Response
Answer:
stimulus response
Explanation:
its stimulus response
what is the oxidation number of chloride ion HClO ?
The oxidation state of Cl is +1
What's the major difference between carbon and other group IV elements, excluding allotropy
Answer:
Carbon has an ability of catenation which other group IV elements lack.
Explanation:
Catenation is the ability for an element to form multiple bonds with other elements leading rise to long chains of compounds.
An example is organic compounds.
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Identify all the signs of a chemical change in the description below:
A clear liquid is placed in a beaker and heated. As the liquid is heated, bubbles form and, gradually, the liquid decreases in the container.
Answer:
When a substance undergoes changes in its chemical composition or combines with another substance to form a new substance is referred to as chemical change. In contrast, physical change is defined as the change in appearance or state of matter and not the chemical composition of the substance.
Explanation:
When a clear liquid is boiled or heated, the kinetic energy of the molecules increases, and the evaporation of the liquid takes place faster. For example, evaporation is a type of physical change, in which the liquid is heated to form bubbles or vapors. These vapors rise in the air and decrease the volume of the liquid. In this process, the liquid has only changed its state of matter (liquid to gas) and not the chemical composition. Thus, there is no chemical change taking place in the heating of water and only physical change is taking place.
Help me:what helium
and what use
Answer:
the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
Explanation:
Because it is very unreactive, helium is used to provide an inert protective atmosphere for making fibre optics and semiconductors, and for arc welding. Helium is also used to detect leaks, such as in car air-conditioning systems, and because it diffuses quickly it is used to inflate car airbags after impact.
