The answer is C. The toasting of the marshmallow is a chemical change.
Why?
Based on the other options:
A.) The melting of the chocolate ISNT a chemical change. It's a physical change.
B.) The digestion of food is NOT a physical change. It's a chemical change.
D. The burning of the wood for the campfire is NOT a physical change. It's a chemical change.
Physical Change: Doesn’t change the composition of the matter. However, its physical appearance and properties can change.
Chemical Change: During chemical changes, the matter that you start with isn’t the matter you end up with.
B
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sodium (Na)
boron (B)
O magnesium (Mg)
lithium (Li)
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An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron
than beryllium. Which element is element X?
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Sodium has three shells while beryllium has two shells. Beryllium has one more valence electron compared to sodium.
Valence electron are the electrons present in outer most shell of the atom Atomic number of beryllium is 4 and its electronic distribution is 2,2. this indicates there are 2 electrons in outermost shell Atomic number of sodium is 11 and its electronic distribution is 2,8,1.This indicates there is 1 electron in outermost shell.Beryllium is found in period 2 of group 2 of the periodic table, which is also known as the alkaline earth metal group. Sodium is found in period 3 of group 1 of periodic table,also called alkaline earth metal group. Thus ,sodium has one less valence electron in outermost shell as compared to berylliumLearn more about valence electron here-
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how many elements are in 3caso4
Answer:
there are only three elements in 3CaSO4: calcium, sulfur and oxygen
What is the name of this lab equipment
The name of the lab equipment is bunsen burner.
What is a bunsen burner?A bunsen burner is a piece of equipment found in many laboratories primarily used for the controlled burning of flammable gas in the air.
In the laboratory, the bunsen burner is used as a source of heating for reactions. The gas-air mixture can be controlled to determine the level of flame and heat that will be produced.
Bunsen burners can vary in structure depending on the maker. The gas supply can be any of butane, propane, etc.
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What is an automatic payment?
A. None of these
B. Payment method that builds a balance that you pay off at a later date
C. A regular payment from your current account, for example for a mobile phone bill
D. A balance below zero dollars in your account
The coastlines in Florida and the deserts in Nevada share landforms that are created when rock weathers into particles that are carried by the wind to form mounds. Identify the landform shared by both states.
Mountains
Dunes
Coastlines
Deltas
B. The landform shared by both coastlines is dunes.
What are sand dunes?Sand dune is the process through which sand grains gather into a mound or ridge by the action breeze caused by gravity.
A sand dune is a landform made from wind or water as deposition agent. This sand dune usually take the shape of a ridge or hill.
How is sand dune formed?Sand dunes are formed when rock break into particles that are easily carried by the wind to form this upward shape.
Once that first upward shape forms, sand gather up on a particular side until it takes the shape of dune
Characteristics of sand dunesDunes form when wind gather sand together through the help of a blocking object or material making sand pile up.Dunes grow as the rate through which this sand accumulate growsEvery dune has a particular side prone to wind known as slipface.Thus, the landform shared by both coastlines is dunes.
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How much valence electrons in 1s2 2s2 2p4
Answer:
This is element 8 which is Oxygen.
Oxygen has two shell
Where L = 2
M = 8
I. E. 8 - 2 =>6
.: it has 6 valence electrons with 0 unpaired electrons.
(4.850 g - 2.34 g)/1.3 mL
which is larger a hydrogen atom or a francium atom? how can you tell?
Explanation:
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question 1: The electron configuration of an element is shown below.
1s22s22p63s1
Name the group this element belongs to in the periodic table and explain your answer.
Based on the electron configuration, write one chemical property of this element. (10 points)
Question 2: Define electronegativity.
A neutral atom has high electronegativity. Describe what happens to this atom during ionic bond formation. (10 points)
The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital.
Based on the electronic configuration, the element is a reducing agent.
Electronegativity is the ability of an atom of an element to attract electrons to itself.
A neutral atom that has high electronegativity will gain electrons to form an anion during ionic bond formation.
What is electronic configuration of an element?The electronic configuration of an element is the arrangement of the electrons found in the atom of the element in shells or orbitals around the nucleus.
Electronic configuration arranges the electrons in the atom of the element in increasing order of energy level.
Considering the given element with the electronic configuration shown below:
electronic configuration of element = 1s²2s²2p⁶3s¹
The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital, the valence orbital.
Based on the electronic configuration, the element is a good reducing agent.
Electronegativity is the ability of an atom of an element to attract electrons to itself.
A neutral atom that has high electronegativity will gain electrons to form a negative ion or anion during ionic bond formation.
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What is the frequency of radiation whose wavelength is 0.81 nm?
Taking into account the definition of wavelength, frecuency and propagation speed, the frequency of radiation whose wavelength is 0.81 nm is 3.48×10¹⁷ Hz.
WavelengthWavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
FrequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Porpagation speedThe propagation speed measures the speed at which the wave disturbance propagates along its displacement.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f× λ
All electromagnetic waves propagate in a vacuum at a constant speed of the speed of light.
Frequency in this caseIn this case, you know:
v= 3×10⁸ m/sf= ?λ= 0.86 nm= 0.86×10⁻⁹ m (being 1 nm= 1×10⁻⁹ m)Replacing in the definition of propagation speed:
3×10⁸ m/s= f× 0.86×10⁻⁹ m
Solving:
3×10⁸ m/s÷ 0.86×10⁻⁹ m= f
3.48×10¹⁷ Hz= f
In summary, the frequency of radiation whose wavelength is 0.81 nm is 3.48×10¹⁷ Hz.
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6. 2074 Old Q.No. 20 2072 Q.No. 20 What is normality? How can you prepare sodium carbonate in 250 ml? 10 solution of sodium carbonate in 250 ml?
Answer: what is normality =
As per the standard definition, normality is described as the number of gram or mole equivalents of solute present in one liter of a solution. When we say equivalent, it is the number of moles of reactive units in a compound.
How can you prepare sodium carbonate in 250 ml?
Procedure
Take a watch glass, wash it with distilled water and dry it.
Weigh the exact amount of clean and dried watch glass and record its weight in the notebook.
Weigh correctly on the watch glass with 1.325 g of sodium carbonate and record this weight in the notebook.
Using a funnel, transfer sodium carbonate softly and carefully from the watch glass into a clean and dry measuring flask.
Wash the watch glass with distilled water to move the particles that stick to it into the foam with the assistance of a wash bottle.
For this purpose, the volume of distilled water should not exceed 50 ml.
Wash funnels several times with distilled water to move the sticking particles into the measuring flask using a wash bottle. Add water in tiny quantities while washing the funnel. The distilled water quantity used for this purpose should not exceed 50 mL.
Using a wash bottle, wash the funnel carefully with distilled water to pass the solution attached to the funnel into the measuring flask
Turn the flask of measurement until the sodium carbonate dissolves.
Using a wash bottle, thoroughly add enough distilled water to the measuring flask just below the etched mark on it.
Add the last few mL of distilled water drop into the measuring flask until the reduced meniscus level just touches the mark.
Put the stopper on the mouth of the flask and shake softly to make the entire solution uniform. Calculate it as a solution of sodium carbonate N/10.
10 solutions of sodium carbonate in 250 ml?
Normally in the laboratory, we are required to prepare 250 ml of solution. Therefore, to prepare 250 ml of \frac{M}{10} Na2CO3 solution, \frac{10.6}{4} = 2.650 g of sodium carbonate are dissolved in lesser quantity of water and the solution is diluted to exactly 250 ml
Explanation:
the amount of hydrogen that would be produced by dropping 2.5 grams of zinc in 100 mL of sulfuric acid solution with the same concentration
In sulfuric acid solution it is produced from sulphur, oxygen and water and the amount of hydrogen is 0.038 mol
Here given data is zinc = 2.5 gram in 100 mL of sulfuric acid means H₂SO₄ solution
Then the reaction is
Zn + H₂SO₄ → ZnSO₄ + H₂
1 mol of Zn has mass = 65.39 g
The amount of Zn is 2.5 gram/ 65.39 g/mol
Zn = 0.038 mol
The amount of H₂ is same as amount of Zn consumed is 0.038 mol
Therefore, the amount of hydrogen produced 0.038 mol
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how to separate bean from mixture without picking them out one by one
What happens to the molecules that make up a as it is heated up in the oven?
Who is the founder of Blue Bell?
Peter Goemans is the founder of Blue Bell .
Blue Bell was established in 1907 as a means of utilising extra cream from nearby dairy producers. Brenham Creamery Company, the predecessor to the business that is today known as Blue Bell, was founded in 1907. The men who founded it thought the name made sense because it was in the sleepy Texas town of Brenham.
Blue Bell may soon resume selling ice cream after a widespread recall forced the company to lay off 1,500 workers in May. Following a widespread product recall this past spring, Sid Bass, a Fort Worth oil millionaire, has now accepted a "substantial investment" from the Brenham, Texas-based ice cream firm Blue Bell.
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What does it mean for an atom to be stable?
Answer:
if the forces among the particles that makeup the nucleus are balanced, it is stable. Stable atoms retain their form indefinitely, while unstable atoms undergo radioactive decay. Most naturally occurring atoms ate stable and do not decay. A stable atom has a net charge of 0. In other words, It has an equal number of protons and electrons.
Acetic acid can be deprotonated to form acetate ion, CH3CO–2 . Draw two other resonance structures. Identify the major (most important) and minor (less important) structures.
Acetate ion consists of a central carbon that is double bonded to an oxygen with two lone pairs. It is single bonded to a negatively charged oxygen with three lone pairs. The central carbon is also bonded to a C H 3 group.Step 1: Define resonance structures.
Step 2: Determine when resonance structures can or cannot form.
Step 3: Draw curved arrows to form resonance structures.
Step 4: Determine whether the resonance structures are major (more important) or minor (less important).
© Macmillan Learning
Draw a curved arrow starting from an alkoxide lone pair of resonance structure B, which will form resonance structure C.
⟷
Draw all atoms of the resulting resonance structure C. Show charges and lone pairs
Step-1. Resonance structures are a set of two or море Lewis structures that collectively describe the electronic. bonding a single Polyatomic. Species include functional bonds and functional Charges.
Step-2. All the resonance structures. must follow the rule writing Lewis Structures. The Hybridisation of Structure must stay the same. The skeleton. of the structure cannot be charged the Same Resonance Structure must have the number of lone pairs.
Whenever Structure for you can draw two or more Lewis molecules. different only the location of the electron, the actual structure. is none of the structure but the resonance hybrid of them all.
Step-3 Given in the picture:
Step-4 The acetate anion (CH₂ coo) has two resonance Structures of the same energy.
One in which the T-bond is on one Oxygen.The other where it's on the other oxygen.These overlap to With half - bonds give the resonance. hybrid is poss the c-o intermolecular distance.
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Would a reaction occur if a piece of metallic Sn were placed in distilled water with a piece of
metallic Zn?
Yes, a reaction will occur if a piece of metallic tin(Sn) is placed with a piece of metallic Zn(Zinc).
To establish whether a reaction will take place or not, we use the reactivity series of metals.
The reactivity series of some metals is given in the adjoining image.
In this series, a higher placed element will react with a lower placed element.
As we can see from the series zinc is at a higher level as compared to tin, therefore it will react with tin.
Thus, a reaction will occur if a piece of metallic tin(Sn) is placed with a piece of metallic Zn(Zinc).
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how much molecules does 3ch4 have?
Answer:
3 moles CH4, and each mole contains 6.02x10^23 molecules and each molecule contains 5 atoms, so there are 5 atoms/molecule x 6.02x10^23 molecules/mole x 3 moles = 9x10^24 atoms
Explanation:
Which state of category of elements has the greatest number of elements? Least?
A teacher preforming a demonstration finds that a peice of cork displaces 23.5 mL of water. The peice of cork has a mass of 5.7 g. What is the density of the cork?
When boiling, the total mass of liquid and vaporized water (1 point)
O increases.
O stays the same.
O fluctuates.
O decreases.
When boiling, the total mass of liquid and vaporized water stays the same.
What is law of conservation of mass?The law of conservation of mass states that the mass can neither be created nor destroyed but is transformed from one form to another.
Importance of law of conservation of massThe law helps us to understand the conversion of energy from one form to another.
For example in a torch, the chemical energy of the batteries is converted into electrical energy, which is converted into light and heat energy.
Based on the law of conservation of mass, the total mass of of liquid and vaporized water during boiling will be constant.
Thus, when boiling, the total mass of liquid and vaporized water stays the same.
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Answer: stays the same
Explanation:
A sample of pure zink has a mass of 4.50 g. Calculate its volume.
According to the given statement A sample of pure zinc has a mass of 4.50 g has a volume of 0.631 cm³.
What does "volume" mean?A three-dimensional object's volume, expressed in cubic units (as inches, quarts, or centimetres), is its cubic capacity. the volume that a material takes up in a given space.
What is the volume formula?As opposed to length, width, and height for a rectangular shape's area, the basic formula for volume is length, breadth, and height. The calculation is unaffected by how the different dimensions are referred to; for example, "depth" can be used in place of "height."
Calculation:Volume= Density/Mass
Mass = 4.50 g
Density = 7.13 g/cm³
Volume = ?
Volume = 4.50 g/7.13 g/cm³
Volume = 0.631 cm³
The zinc has a 0.631 cm³ volume.
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how could you prove that dissolving table salt in water is a physical property, not a chemical change
Answer:
Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed. Physical changes can often be reversed. Allowing the water to evaporate will return the salt to a solid state.
is fluorine is insoluble or soluble ?
Answer:
fluorine is soluble
Explanation:
Determine the energy of 1.10 mol of photons for each of the following kinds of light.
infrared radiation (1580 nm )
visible light (520 nm )
ultraviolet radiation (170 nm )
The energy of the photons are;
infrared radiation - 8.3* 10^4 J
visible light - 2.52 * 10^5 J
ultraviolet radiation - 7.72 * 10^5 J
How do we find the energy?The energy of photon could be found by the use of the of the equation;
E = hc/λ * 6.023 * 10^23/1 mole
E = energy of the photon
c = speed of light
λ = wavelength of the photon
Now;
For infrared radiation;
E = 6.6 * 10^-34 * 3 * 10^8/1580 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol
E = 8.3* 10^4 J
For visible light;
E = 6.6 * 10^-34 * 3 * 10^8/520 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol
E = 2.52 * 10^5 J
For ultraviolet radiation;
E = 6.6 * 10^-34 * 3 * 10^8/170 * 10^-9 * 6.023 * 10^23/1 mole * 1.10 mol
E= 7.72 * 10^5 J
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pls answer I I’ll give u brainliest
Answer:
low density -> high temperature -> increased particle motion -> high kinetic energy -> high thermal energy -> greater thermal expansion -> more contraction
Explanation:
To model the relationship between these factors, you need to understand how they interact. A greater density of particles usually means they are moving slower, thus resulting in less energy and less heat consequentially. As temperature increases, particles will begin to move rapidly (increase motion) and have higher kinetic energy. Similarly, a lower temperature will lead to less motion and lower kinetic energy. Furthermore, their thermal expansion will be less and have a decrease in contraction, as they will be more compact and dense.
Therefore you could make a model such as:
low density -> high temperature -> increased particle motion -> high kinetic energy -> high thermal energy -> greater thermal expansion -> more contraction
Over a hundred years ago, the prairies of South Dakota were home to dozens of kinds of grasses and hundreds of kinds of insects. This supported many populations of small mammals and birds. Today the prairies are dominated by domesticated wheat crops that humans can harvest and use for food. Pesticides used in growing the crops have killed off many kinds of insects that once lived there. In addition, the pesticides have poisoned populations of native mammals, such as prairie dogs. Which of these is most likely an additional change that has occurred in this ecosystem?
O A. Pesticides have been washed into local sources of drinking water.
OB. There has been an increase in the amount of space available to mammal populations.
OC. There has been an increase in the variety of food sources available to bird populations.
O D. Native grasses have adapted to become more edible to humans.
An additional damage of the pesticides is that they have been washed into local sources of drinking water.
What are pesticides?The pesticides are chemicals that could be used to prevent the growth of weeds on agricultural lands. We know that many of these pesticides have the ability to find their way into food grains and bioaccumulate in human systems.
These pesticides are equally able to poison the mammal populations that are in an area as well as to move along with surface water into the surrounding water bodies were they contaminate aquatic organisms.
Hence, an additional damage of the pesticides is that they have been washed into local sources of drinking water.
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Hello please help, thank you so much!
Answer:
7.) 126.7 cm³
8.) 789 g
Explanation:
7.) To find the volume (cm³) of alcohol, you need to multiply the given mass (g) by the density. The denisty ratio represents grams of the alcohol per every 1 cm³. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value with the least amount of sig figs (100.0 grams).
100.0 grams 1 cm³
--------------------- x --------------------------- = 126.7 cm³
0.78945 grams
8.) This time, you are given the volume instead of the mass. The same process can be used in this problem, but you first need to convert liters (L) to cm³ to be able to use the denisty ratio. Once you find the volume in cm³, you can multiply it by the density to find the mass. Again, be sure to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the given value with the least amount of sig figs (1.00 L).
1 L = 1,000 cm³
1.00 L 1,000 cm³ 0.78945 g
------------- x ------------------- x -------------------- = 789 g
1 L 1 cm³
Convert the following numbers
540,000
The result in binary would be 10000011110101100000.
By constantly dividing the supplied number by 2 until we receive 0 as the quotient, we can convert a decimal number to a binary number in the simplest way possible. The binary value of the specified decimal number is then obtained by writing the remainders in reverse order. A binary number is made up of two 0s and 1s. Two is used as the base representation for binary numerals. As an illustration, (101)2 (101) 2. Switches can be used to encode and store numbers in binary form. This system is compatible with a variety of digital devices, including computers, calculators, digital TV decoder boxes, cell phones, burglar alarms, watches, and more. Binary values are kept in memory, which is essentially a collection of electronic on/off switches.
The complete question is- Convert 540000 to Binary form.
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