Answer:
Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.
Explanation:
He holds a marshmallow on a metal skewer over a fire. A few seconds late, the marshmallow is cooked and the skewer feels warm.
The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
What is thermal energy?The term thermal energy refers to a form of energy that exists as a result of the temperature difference between two bodies. Thermal energy will always flow from the hotter to the cooler body.
Hence, the marshmallow is cooked and the skewer feels warm shortly after because the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
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Heat transfer between two substances is affected by specific heat and the chemical composition of the substances. state of matter of the substances at room temperature. thermal equilibrium of the substances. amount of time and area of physical contact between the substances.
Answer:
the answer is D
Explanation:
Answer:
D. Amount of time and area of physical contact between the substances
Explanation:
This is because with a greater surface area and more physical contact heat transfer can be transferred more quickly
Why do you think the spacecraft’s speed was different on the Monday, Tuesday, and Wednesday launches?
Answer:
I think because Moving an object against a stronger magnetic force transfers more energy to the magnetic field. Magnetic forces
are stronger closer to magnets. The Wednesday test launch stored more potential energy, and launched the
spacecraft at a faster speed because the stronger magnetic field closer to the magnet resulted in a greater
increase in potential energy.
Explanation:
help please! :)
Why are prefixes not needed in naming ionic compounds?
A. lon charges are written as superscripts with the names of the
atoms.
B. Roman numerals are used instead of prefixes to indicate number.
C. Subscripts are used in the name to indicate number of atoms.
D. Ions combine in only one ratio.
Answer:
Ions combine into only one ratio
Explanation:
Just took test
Prefixes are not used to indicate the number of atoms when writing the chemical formula. The number of atoms are written as subscripts to their chemical symbols.
What is chemical formula?Chemical formula of a compound is used to identify a compound and distinguishes it from other compounds. A chemical formula is written from the chemical symbols of elements which constitute the compound.
The number of atoms of each element is written as the subscripts of the symbols for each atoms. For example,magnesium chloride contains one magnesium and two chlorine atoms thus, its formula is MgCl₂.
The subscripts for each atom in the formula of an ionic compound is the charge of the other atom into which it is bonded. Similarly, the formula of iron oxide containing 2 Fe and 3 O is written as Fe₂O₃.
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if motor bike travels 2.4 km in 5 min find it average velocity?
Answer:
28.8km/h
Explanation:
Change the 5min to hours.
=5/60 =0.0833hrs
Velocity= Distance /Time
2.4/0.0833
=28.8km/h
The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the formula. Explain how the drawing of NaCl both illustrates that the compound exists as a large collection of ions and that the ratio of sodium ions to chloride ions is 1-to-1 as indicated by the formula NaCl.
Answer:
The ionic compound NaCl has a Face Centered Cubic unit cell
The site for atoms are Face, center and Edges corner.
Effective number of atoms
Na+
1centers + 12edges x[tex]\frac{1}{4}[/tex] = 4 Na+
Cl-
6face x[tex]\frac{1}{2}[/tex] + [tex]\frac{1}{8}[/tex] x8 corners = 4Cl-
This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.
PLEASE HELP PLEASE
Which of the following is a chemical property?
A: mass
B: oxidizes in air
C: boiling point
D: solubility
Answer:
Oxidizes in air
Explanation:
When water boils, it is still water, just in a different state. solubility and mass are not chemical properties because they don't involve chemical reactions or changing the identity of a substance.
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Why can't we say that acids react with all metals to produce hydrogen ?
Answer:
The more reactive the metal, the more rapid the reaction is. A metal below hydrogen in the reactivity series will not react with dilute acids.
Explanation:
Answer:
Explanation:
Usually when an acid reacts with metal, salt and hydrogen are produced. Acid + metal = salt + hydrogen. Example calcium nitrate + hydrogen. Hope this helps
What are two natural and two man-made causes for sudden catastrophic change to an ecosystem
Answer:
Some changes that can occur in ecosystems are seasons, tide cycles, population sizes, succession, evolution, landscape changes, and climate changes.
Explanation:
How many atoms are in 1.75 moles of neon?
Explanation:
it contains 6.02*1023atoms
Atom, the smallest unit of material which may be separated without releasing electrically charged. It is also the smallest unit of mass with the properties of a chemical element.
Avogadro's number is [tex]\bold{6.022\times 10^{23}}[/tex], which is the number of units in one mole of any material.Calculating of atoms are in 1.75 moles of neon:[tex]\to \bold{ 1.75 \times 6.022\times 10^{23}}\\\\\to \bold{ 10.5385 \times 10^{23}}\\\\[/tex]
Therefore, the answer is "[tex]10.5385 \times 10^{23}[/tex]".
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Q 1. Element M is a metal that forms compounds of the type MX2, MX3, and MX4, where X is a Chlorine (Cl).
I) What is the expected trend in the ionic radius of M in these compounds?
II) Arrange these compounds in order of decreasing ionic radius of M.
Do not respond if u don’t know the answer. I’ll report it and u will get a warning.
Answer:
See explanation
Explanation:
The ionic radius of metal M decreases as the charge on the metal M increases. The ionic radius is generally defined as the distance between the nucleus and the outermost electron of the ion. Hence, ionic radius becomes much lesser as the magnitude of the positive charge increases.
It is obvious from the various formulae of metal chlorides in the question that the metal forms cations M^2+, M^3+ and M^4+ respectively. The order of decreasing ionic radius of the compounds is;
MX2 > MX3 > MX4
Carbon has a half life of 5730 years, how many years would it take a 4 g sample to
decay to .5 g
Answer:
17190
Explanation:
half of 4 is 2 and half of 2 is 1 and half of 1 is .5 so you have now gone through 3 total half lives. Mulitply 5730 and 3.
Which structures do plant cells have for making food that animal cells do not?
mitochondria
vacuoles
lysosomes
chloroplasts
Answer:
Answer
Explanation:
The chloroplast. Animal cells DO NOT make their own food, while chloroplasts are needed in the plant cell to carry out photosynthesis.
Answer:
A Mitochondria is the power house of the cell, So it's not A.
vacuole is the water storage, So it's not B.
the lysosomes remove Waste, Cellular Debris, and foreign particles, So it's not C.
It's D chloroplast create food for the cell .
(Hope this helps :) )
Explanation:
Look at the image.
What does this image represent?
a) hydroxyl group
b) ether group
c) carbonyl group
d) amine group
Answer:
a carbonyl group
Explanation:
Functional group can be interconverted into each there by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. The correct option is option D that is amine group.
What is functional group?A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry. Functional group determine the property of a compound.
The list of functional group are as follow:
Carboxylic group COOH
Alcoholic group OH
Ammine group R-NH₂
Ketonic group R-CO_R
Aldehydic group R-CHO
Thiol group R-S-H
Cyanide group -CN
The given image represent amine group.
Therefore the correct option is option D that is amine group.
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what type of energy is released when electric charge moves between the clouds and ground
The model of the atom that pictured the atom with electrons randomly distributed throughout the positively charged mass was known as the
Answer:
The cannonball model
Explanation:
Hope this helped!! :)
Use the drop-down menus to complete the sentences describing what happens when the temperature of a fluid increases. The kinetic energy of the molecules . The speed of the molecules . The density of the fluid . The fluid
Answer:
The kinetic energy of the molecules
increases
.
The speed of the molecules
increases
.
The density of the fluid
decreases
.
The fluid
rises
.
Explanation:
this is correct on edge
When the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.
Kinetic energy can be defined as motion energy, whereas potential energy is energy stored to be used when required.In a given object, as kinetic energy increases, the motion of the molecules also increases.An increase in kinetic energy (and temperature) in a fluid leads to the separation of its constituent particles, thereby decreasing the density.In conclusion, when the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.
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When a forest burns and all that's left is some ash,
where did most of the mass of the trees go? List the 2 molecules produced. What is the equation for combustion, starting with sugar and oxygen.
Answer:
C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + H₂O
Explanation:
When a forest burns and all that's left is some ash, most of the mass of the trees go to the atmosphere, in the form of carbon dioxide.
In a total combustion process of organic matter, the two molecules produced are carbon dioxide and water. (CO₂ and H₂O)
The equation for the combustion of glucose is:
C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + H₂O
Answer: i think C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + H₂O
Explanation:
Otto and Olivia each have six markers. Otto is missing the purple and green markers, and
Olivia is missing the black and brown markers. What can they do so that each has a full set?
Answer:
Otto and Olivia should just buy more markers
Hey, it'd be really cool if someone could help me with this-- 15 pts!
Complete and balance this chemical equation: NaClO3 ---> _____
Answer:
NaCI + O2= NaCIO3 I think
Potassium and calcium are rarely found as pure elements in nature. They are usually combined with other substances. Explain why is this so.
Potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.
Reactivity of ElementsReactivity of elements refers to the ability of atoms of elements to gain or lose electrons in order to form bonds with other elements.
The most reactive elements are those of group 1, 2 and 7.
Group 1 elements are known as alkali metals and easily lose their one valence electrons to form ions.Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is potassium.
Group 2 elements are known as the alkaline earth metals.They are very reactive as well and lose their two valence electrons easily to forms ions. Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is calcium.
Therefore, potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.
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The atomic mass of one atom of an element is determined by the number of
protons only
protons and electrons
protons and neutrons
neutrons only
Answer:
#2 bro
Explanation:
Answer: protons and electrons
Explanation: :)
Does Phosphorus (P) gain/lose electrons to form ions
Answer:
phosphorous gain electron to form ions
Explanation:
Explain why calcium (Ca) has a greater atomic radius than magnesium (Mg).
Answer:
Magnesium nucleus will attract the electrons more toward it and therefore, shrinking the size of the atom. Magnesium atom is smaller than Calcium atom because Calcium has more electron ( 20e− ) which will occupy more energy levels ( n=4 for Calcium versus n=3 for Magnesium)
What phase is Nitrogen at 80K
Answer:
i believe its gas sorry if i am wrong
Explanation:
Heat can speed up the break down of compounds into two or more simpler substances. This is an example of which type of reaction?
A. synthesis
B. decomposition
C. reaction
D. combustion
pls answer
What type of energy could be converted by using the stationary bikes? From ______ energy to _______ energy.
Answer:
Kinetic energy to Electrical energy.
Explanation:
When stationary bike is pedaled the wheels of the bike rotates which is a form of kinetic energy, this kinetic energy can be converted into electricity when connected to a generator.
From _Kinetic_ energy to _Electrical_ energy.
Calculate the amount of potential energy a 200 kg car has on top of a 15 m hill
Explanation:
Is this gravitational potential energy?
help me pleaseeee!!!
thissssssssssssss isssssssssssss B
Answer:
The bars and the gymnast's hands
Hope This Helps!
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1. A 100. g samle of water absorbs how many Joules of energy as its temperature is changed from
35.0 C to 60.0 C. (water s = 4.184 J/g C)
Answer:
10460J
Explanation:
Given parameters:
Mass of water sample = 100g
Initial temperature = 35°C
Final temperature = 60°C
Unknown:
Amount of energy absorbed by water = ?
Solution:
The amount of energy absorbed by water is mathematically expressed below;
H = m C ΔT
H is the amount of energy
m is the mass
C is the specific heat capacity of water = 4.184J/g°C
ΔT = 60°C - 35°C = 25°C
Now insert the parameters and solve;
H = 100 x 4.184 x 25 = 10460J
How do I find the Electrons of a substance? For example, there's like 10 protons & neutrons, how would I find the electrons? Please help ASAP!
Answer:the number of electrons is equal to the number of protons in a neutral atom that is. In a cation or anion atom you either gain or lose electrons. Let’s say it’s a cation +3 you lose 3 electrons. Now let’s say it’s an Anion -3 you gain 3 electrons. Hope this helps.
Explanation:
