Answer:
There are 0.24952533574875027 moles for 28.65 grams.
Explanation:
1 gram = 0.0087094358027487 mole
How do you start the reaction in a glow stick
Answer:
crack the glow stick.
Explanation:
it breaks the glass inside mixing the 2 chemicals. which makes it glow
PLEASE, i need so much help. Do this one thing for me please. It's enthalpy, 3 parts. It's so fast just please...
The following reaction occurs under standard conditions:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
a. Which bonds are broken and which are formed during the reaction? (1 point)
b. Determine the enthalpy of the reaction. (2 points)
c. Is the reaction endothermic or exothermic? Explain. (1 point)
Answer:
A and C
Explanation:
I can help you with A and C but I don't have the enthalpy calculation handy to perform the calculation.
A. You are breaking the Carbon-Hydrogen bonds in methane CH4 and the Oxygen-Oxygen bond. You are forming bonds between Carbon and Oxygen to form CO2 and you are forming bonds between Hydrogen and Oxygen to form water.
B. skipped
C. The reaction is exothermic. The reaction is burning methane in oxygen. This reaction will give off heat which is the definition of exothermic.
A student made this mode using paper molecules and a piece of yarn. She want to shows how simple transport works. if the model starts as shown above, wha should the final model look like?
Answer:
I think the correct answer is B.
Explanation:
It was approved for me! Hope it helps.
According to the concept of diffusion, the final model would look like B as it has equal number of molecules on either side.
What is diffusion?Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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What do I search if my essay is based on the 6th mass extinction?
Answer:
Just search up the questiona and go through each of the google answers that pull up??
Explanation:
Answer:
Just search human causing the sixth mass extinction
Question 1 of 10
A wave traveling through air meets an object and passes through it with no
change in speed, energy, or direction. Which statement best describes what
has happened to the wave?
O A. The wave was absorbed by the object.
O B. The object's surface reflected the wave.
O C. The object caused the wave to refract.
O D. The wave was transmitted through the object.
SUBMIT
Answer: b, the object reflected the wave.
Answer:
the wave was transmitted through the object
Explanation:
why do different atoms give off different colors of light
When heated, atoms give off different colors of light because different atoms emit different colors when the electron jumps from their ground state to a higher energy level, this is called excitation. When electrons move energy levels, a photon is given off (this is emission) and photons have different wavelengths and frequencies so they will have different energies that produce different colors of light.
i hope this made sense! sorry haha
electron negativity
Answer:
Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7.
Explanation:
Please mark as brainliest
Answer:
What is Electronegativity?
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons. An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.
How do you find electronegativity?
On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
Example of electronegativity
Water, a Polar Bond
Hydrogen has an electronegativity of 2.0, while oxygen has an electronegativity of 3.5. The difference in electronegativities is 1.5, which means that water is a polar covalent molecule
What causes electronegativity?
Electronegativity increases as you move across the periodic table from left to right. This occurs due to a greater charge on the nucleus, causing the electron bonding pairs to be very attracted to atoms placed further right on the periodic table. Electronegativity decreases as you move down the periodic table.
What does "naked" DNA mean? What kinds of organisms have "naked" DNA?
Answer:
The naked DNA is a free DNA without surrounded by any protein or lipid layer.
Prokaryotes have naked DNA.
Explanation:
Answer:
prokaryotes have naked DNA because they have no nucleus to store the DNA in :D
Explanation:
PLEASE HELP!! 20 Points for Brainiest!
Which element is a metal from the lanthanide series?
rutherfordium (Rf)
americium (Am)
mendelevium (Md)
dysprosium (Dy)
Answer:
dysprosium (Dy)
Is a metal from the lanthanide series.
Explanation:
are all microscopic the same size?
Can someone answer this cause I am not sure of my answer
Answer: B
Explanation: my answer is just X because an ionic bond requires a metal cation and a nonmetal anion. But since there’s isn’t only X, I would choose B
Volcanic belts form along a. islands in the Pacific Ocean. b. North American mountain ranges. c. the boundaries of Earth's plates. d. the coast of Antarctica. Please select the best answer from the choices provided
Answer:
a. islands in the Pacific Ocean.
Explanation:
A volcanic belt is a large region of intense volcanic activity.
We can clearly see that volcanic belts are regions where volcanic activity is maximum. Volcanic belts are characterized by eruptions of gases, ash, rock, lava etc.
Such eruptions push magma to the earth's surface at high temperature. The area around the Pacific that is prone to volcanic activities is generally referred to as the 'ring of fire'.
Along the boundary of the Earth's plates, volcanic belts develop. Huge chunks of the crust diverge (pull apart) or converge (push together) at plate boundaries. Because of this, the crust frequently breaks, enabling magma to rise to the surface. It is formed along islands in the Pacific Ocean. The correct option is a.
The Alpide Belt, which spans from the Azores through the Mediterranean and Middle East to the Himalayas and Indonesia, where it joins the Circum-Pacific Belt, and the Circum-Pacific Belt itself are the two main seismic belts that encircle the Pacific Ocean.
On land and in the oceans, tectonic plate boundaries are home to the majority of the planet's volcanoes. Volcanoes on land develop when one tectonic plate slides beneath another. A thinner, heavier oceanic plate typically subducts beneath a thicker continental plate.
Thus the correct option is a.
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PLEASE HELP ME ON THIS QUESTION
Answer:
(B)
Explanation:
Answer:
When you refer to subatomic particles, they are the electron, the proton and the neutron, of which the electron has the lowest mass. Within the particles, their subdivisions, known as quarks, are not even particles, but mass-electric combinations composed of subquantitative rules that can not function independently.
Explanation:
New substances are always formed when matter undergoes a ___.
Answer:
Chemical Change
Explanation:
Also known as a Chemical Reaction, this is when a substance reacts to something else, changing its Physical and Chemical Properties.
explain what is random motion of particals
Answer:
Also known as Brownian motion
Explanation:
If you take a gas particle and drop it in a container, you will observe under a microscope the particle will be moving in a random pattern. Eventually it will collide with another particle. They are free to move. Each particle has it's own kinetic energy.
They can be described as small, discreet and meaning all the particles are separate. They will not stick together.
The path these particles take is random.
Example: Dust particles move randomly. The reason why the dust particles more randomly is because of the air or gas between them. You can observe dust particles in the air when you are looking in the sun light but you don't see the air molecules. It appears the dust is doing the moving but it's the gas in between them that is moving them.
Another example is : Pollen in water also moves randomly in water. Each water molecule is too small to see, but you can see the pollen moving because it is bigger. This is the Brownian motion.
The number of each period in the modern periodic table
represents the number of
Periods are the horizontal rows of the periodic table, with each period number indicating the number of orbitals for the elements in that row.
What is periodic table?A periodic table, also known as an elemental periodic table, is a tabular representation of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is widely regarded as a chemistry icon.
The arrangement of the periodic table also allows scientists to detect trends in element properties such as electronegativity, ionization energy, and atomic radius.
Periods are basically the horizontal rows. Periods represent the relationship of orbitals, or likely areas where electrons will be found, inside the atom's outermost shell. The periods correspond to atoms with a more electron-rich core of inner shells.
Thus, the number of each period in the modern periodic table represents the number of orbitals.
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For everything I answer for y’all can y’all do this for me plz
Answer:
GREETINGS!
in phenomenin 3
phase change vapourization
1st liquid
2nd gas
When u give heat to the liquid their Kinetic energy increases when their kinetic energy increases they collide with eaxhother and move farther away resulting in escape of particles in from of gases
In phenomenon 4
phase change freezing
1st liquid
2nd solid
when temperature decrease the kinetic energy of particles decreases in result particles come close to each other and they convert into solid that is freezes
HOPE IT HELPS
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide
Answer:
223 g
Explanation:
How can plants get the glucose monomers they need for building carbohydrate polymers?
Answer:
The sun is always how plants get glucose
The plants get the glucose monomers they need for building carbohydrate polymers by incorporating atoms from the surrounding environment.
What are carbohydrates ?The term carbohydrate is defined as an optically active polyhydroxy aldehydes or ketones or the compounds which produce units of such type on hydrolysis”.
Carbohydrates are made up of carbon, hydrogen, and oxygen. Monosaccharides, disaccharides, oligosaccharides, and polysaccharides are all types of carbohydrates.
Plants use atoms from their surroundings to incorporate the glucose monomers they require. In order to create glucose and oxygen molecules, plants use the carbon dioxide and water molecules in their surroundings.
Thus, The plants get the glucose monomers they require for building carbohydrate polymers by incorporating atoms from the surrounding environment.
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The diagram shows a teakettle of water being heated. Which process is shown by the arrows inside the teakettle?
A. Insulation
B. Radiation
C. Convection
D. Conduction
PLS HURRY
Answer:
its c.
Explanation:
look up what convection is.
Which description justifies why the theory of evolution is a theory and not a law? (4 points)
a
Explains how organisms change in response to the environment
b
Predicts which organism is best suited to the environment
c
Supported by a small amount of empirical evidence
d
With more evidence, it will become a law
Which of the following elements has the smallest
atomic radius?
O a. chlorine
O b. sulfur
O c. selenium
O d. bromine
Answer: It’s A. Chlorine
Explanation:
Chlorine has the smallest atomic radius among the given elements. Therefore, option A is correct.
What is the atomic radius?The atomic radius of an atom can be defined as the shortest distance between the center of the nucleus and the valence shell of the atom. An atomic radius can be described as half the separation between two atoms of the same element bonded together.
In general, the atomic radius reduces as we move from left to right in a particular period on the modern periodic table because while moving from left to right in a particular period, there is a rise in the effective nuclear charge. In periods, the new electrons enter the same electron shell.
The atomic radius increases when we move down a particular group because of the addition of a new principle shell.
Chlorine is present after the sulfur at the end of the same period. Therefore, Chlorine experiences a more effective nuclear charge than sodium so it has a smaller atomic radius.
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specialized cells are found only in?
Answer:
Specialized cells are found only in multicellular organisms.
Explanation:
Or organisms are made up of more than one cell.
Specialized cells are generally found only in multicellular organisms.
What are multicellular organisms?A multicellular organism can be described as an organism that contains more than one cell, in contrast to a unicellular organism. Multicellularity has been independently at least 25 times in eukaryotes and in some prokaryotes, like myxobacteria, cyanobacteria, and actinomycetes.
All species of animals, plants, and most fungi are multicellular organisms, whereas a few organisms are partially uni- and partially multicellular, such as slime molds and social amoebae.
Multicellular organisms develop in many ways such as by cell division or by aggregation of many single cells. Colonial organisms can be defined as identical individuals joining together to form a colony.
Unicellular organisms are divided, and the daughter cells failed to separate which results in a conglomeration of identical cells in one organism, which could develop specialized tissues.
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i need help im stupid
Answer:
physical property
Explanation
Answer:
Helium is a chemical element with symbol He and atomic number 2. Classified as a noble gas, Helium is a gas at room temperature so in result a physical property.
And BTW, your not stupid everyone is smart they just have to apply themselves and give it their all!
best wishes!!
I will give u brainliest if u get it right. I want someone smart.
Answer:
A just A
Explanation:
Answer:
so is c they have the same mass.
Silver chloride (AgCl) is used in antimicrobial products such as personal deodorants. Based on the Types of Bonds Lab, what type of properties would you expect AgCl to have.
Answer:
yesss again dobu wanta ti play online
A crystal is placed in a graduated cylinder containing 27 ml of water. the water rises to 60ml. what is the volume of the crystal?
Answer:
The answer is 33 mLExplanation:
The volume of the crystal can be found by using the formula
volume = final volume of water - initial volume of water
From the question we have
volume of crystal = 60 - 27
We have the final answer as
33 mLHope this helps you
Answer:
33 ml
Explanation:
60 - 27 = 33 ml
☺️Hope this helps☺️
What would happen to the density of an object if the volume increases but the mass stays the same
decrease
Explanation:
We all know, Density = Mass/ volume. When volume increases and the mass remains the same , the density will decrease considerably
Answer:
The density decreases.
Explanation:
Think of a balloon. It is tied up. It has air inside. If you heat the balloon up, it expands but the amount of air inside the balloon stays the same. Therefore, there is less air per cubic millimetre, making it less dense.
The scientific study of interactions among organisms and between organisms and their environment is _________________.
A: biosphere
B: ecology
C: trophic level
D: community
Answer:
ecology
Explanation:
Ecology is the study of the interactions between organisms and their environment (biotic and abiotic) •
Answer:
ecology
Explanation:
Ecology is the study of the interactions between organisms and their environment
Physical properties are used to classify and compare substances. Physical
properties can include density, thermal conductivity, electrical conductivity,
solubility, magnetism, melting point, and boiling point. Which statement is
correct about all of these physical properties?
They involve a change in the state of matter.
They involve the production of new substances.
They can be measured only after a change in state.
They are independent of the amount of the sample present.
Answer:
Physical properties involve a change in the state of matter.
Explanation:
A chemical change would change the chemical composition.
A physical change would change the state of matter, for example solid to liquid to gas are changes in state. So, this means when water changes states of matter it is a physical change.