Models can be used to represent a process or show the composition of a material. For example, a model of an atom shows what matter is made out of and how it is composed. Scientists have been using models since ancient times to help explain the world around us. Models help you understand something that you cannot see or touch by making it visible or giving it a form that you can physically explore. In this case, the model lets scientists explore atoms without having to use an electron microscope. This method provides them with up-close images from different angles so they can learn about their properties in detail.
What is vibration????
if 38 gr of water are produced in reaction, how many mole are CO2 are produced.
help me. correct answer will be marked as brnlst
Answer:
PCI3
Explanation:
It does not obey the octet rule on the nitrogen atom.
Each of the following sets of quantum numbers is supposed
to specify an orbital. Which of the following sets of quantum
numbers contains an error?
A) n = 2, l = 1 , ml = -1
B) n = 4, l = 2, ml =0
C) n = 3, l =3 , ml = -2
D) n = 1, l = 0, ml =0
E) n = 3, l = 0, ml =0
Answer:
C
Explanation:
The azimuthal quantum number can take values from 0 to (n-1)
So in answer C n= 3, l can take values between 0
and 2.
l can't be 3.
ml can take values from -l to +l.
Hope you understood
An aqueous solution of a vanadium chloride salt is electrolyzed by a current of 3.00 A passing through the solution for 60.0 min. If 5.70 g of vanadium is produced at the cathode during this time, what is the likely formula unit for the vanadium salt
From the information in the question, the formula unit of the salt is given as VCl.
The quantity of charge produced is obtained from;
Q = It
I = current (3 A), t = time (3600 s)
Q = 3 A × 3600 s
Q = 10800 C
Now we need to find the number of electrons transferred as follows;
51 g of Vanadium is deposited by 96500n C
5.70 g is deposited by 10800 C
5.70 × 96500n = 51 × 10800
n = 51 × 10800/5.70 × 96500
n = 1
The formula of the salt is VCl.
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What is the mass of sulphate ions 96.06 in 25.0ml of a 0.125 solution
Answer:
12.34
Explanation:
because this is how we do this
Pa help po asap now na po
What is inertia?(1 point)
A. a force that acts on an object at rest
B. the motion of an object
C. an object’s resistance to a change its motion
D. the speed and direction of an object in motion
Answer:
I think it's C. hope this helps:)
a hot air balloon has a volume of 875L. what is the original temperature of the balloon if its volume changes to 955 L when heated to 56
Answer:
using Charles law
v1/t1= v2/ t2
Explanation:
875/t1=955/56+273
t1= 329* 875/955
t1= 302.82k
The initial temperature of the hot air balloon can be calculated from Charles's law. The initial temperature of the balloon was, 51.3 °C.
What is Charles's law?According Charles's law, at constant pressure, the temperature and volume of a gas is in direct proportionality. Thus volume increases with an increase in temperature. Therefore V/T = a constant.
Let V₁ and T₁ be the initial volume and initial temperature and V₂ and T₂ be the final volume and temperature respectively. Thus we can write the relation as:
V₁ /T₁ = V₂/T₂ .
Given that the initial and final volume are 875 L and 955 L respectively. The final temperature is 56 °C. Thus the initial temperature is calculated as :
T₁ = V₁T₂/V₂
= (875 L × 56 °C )/955 L
= 51.3 °C.
Hence, the initial temperature of the hot air balloon was 51.3 °C.
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How does using more water in a beaker affect the solubility in an experiment?
What is the name of the branched alkane shown below?
لہ
A. 3-methyloctane
B. 4-methylheptane
C. 3-methylheptane
D. 4-methyloctane
Answer:
4-methyloctane
Explanation:
other guy got it wrong, this one's right
The name of the branched alkane is 4-methyloctane as it has 8 carbon atoms.
What is an atom?An atom is defined as the smallest pa of matter which makes a basis of an element. Every form of matter whether it be a solid,liquid , gas consists of atoms . Each atom has a nucleus which is contains protons and neutrons and shells in which the electrons revolve.
The protons are positively charged particles and neutrons are neutral particles and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not change the chemical properties of the substances.
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Jason and Sheldon are neighbors who work for the same accounting firm. They leave the office at the same time. After t seconds, Jason's distance from the office in meters is given as 4 more than 3 times t, while Sheldon's distance from the office is 6 more than 2 times t.
The function that represents the total distance d(t) that Jason and Sheldon cover together in t seconds is given by d(t) =
. In 7 seconds, Jason and Sheldon together cover a distance of
meters.
What type of mixture is this illustration?
Answer:
Suspension
Explanation:
It's a suspension because it is not mixed at all, and has distinctly separate layers.
How do weak intermolecular bond strengths affect the melting and boiling point of a substance? (Picture is of answers I can choose from)
For a weak intermolecular bond, both the melting point and boiling point are lower.
A lesser energy is required to break bond of weak intermolecular forces while a greater energy is required to break bond of strong intermolecular forces.
E ∝ T
where;
E is the energy required to break the bondT is the temperatureA lesser energy means a lower temperature and a lower temperature will result in lower boiling point and melting point.
Thus, we can conclude that for a weak intermolecular bond, both the melting point and boiling point are lower.
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Which of the sequence best describe how a piece of chicken nugget is digested in the human body?
mouth, esophagus, small intestine, large intestine, stomach
mouth, esophagus, small intestine, large intestine, stomach
mouth, stomach, small intestine, large intestine, esophagus
mouth, stomach, small intestine, large intestine, esophagus
mouth, esophagus, stomach, small intestine, large intestine
mouth, esophagus, stomach, small intestine, large intestine
None of the above
The sequence for the disgestion of a piece of chicken nugget in the human body is: C. mouth, esophagus, stomach, small intestine, large intestine.
What is digestion?Digestion can be defined as a form of catabolic activity that involves the breaking down of food into smaller sizes that can be absorbed as nutrients by the body of a living organism while releasing energy through the process.
Based on the digestive system, the sequence for the disgestion of a piece of chicken nugget in the human body are:
MouthEsophagusStomachSmall intestineLarge intestineRead more on disgestion here: https://brainly.com/question/22686081
Bio fuel is a mixture of petrol and 20%——————
Answer:
methane and petrol okkkkkkkkkkkkkkkkkkk
How does using more water in a beaker affect the solubility in an experiment?
Answer:
it may lead to read false measurements
while in an experiment.
that's what I think.
The Periodic table below shows major regions in different colors. In this periodic table, which type of element is shown in green boxes?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The Correct choice is~ B
The elements shown in green boxes are ~ Metalloids
Why were people from lower castes drawn to Buddhism?
O The Buddhist belief in equality appealed to them.
O Buddhism allowed people from all castes to participate.
People from the lower castes were born into Buddhism.
O People in the lower castes wanted to choose their own religi
Answer:
During the Maurya empire, the Indian culture and way of life were deeply influenced by Buddhism. Buddhism appealed to people of lower castes because it emphasized individuals' path to enlightenment and salvation, which could be attained in this life.
Explanation:
give some practical examples where prefixes are used
PLEASE ANSWER WITHIN THIS HOUR!
Which of the following does NOT describe the epidermis?
A. It is waterproof.
B. It houses the sweat and oil glands.
C. It is the outermost layer of the skin.
D. Its surface consists of dead cells that continually shed off.
Thank you!
Answer:
it doesn't house the sweat and oil glands
Explanation:
the epidermis doesn't house the oil and sweat glands but the dermis does
The table compares vapor pressure values for water ethanol and diethyl ether Add six temperatures determine the approximate normal boiling point for each substance what do the data suggest about the relative strength of attraction between particles in each substance
Water has the strongest intermolecular forces followed by ethanol and diethyl ether has the least intermolecular forces.
From the table, we can see the vapor pressures of water, ethanol and diethyl ether. The boiling point of water is 100°C, the boiling point of ethanol is 80°C while the boiling point of diethyl ether is 40°C.
We can see that the vapor pressures and approximate normal boiling points of the substances varies with the nature of intermolecular bond forces in the molecule.
Water has highest boiling point and the lowest vapor pressure followed by ethanol. Diethyl ether has the highest vapor pressure and lowest boiling point from the data in the table.
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*1. Which statement about the temperature of a phase changes in electrostatic forces holding the molecules is correct?
A. The temperatures of which a substance changes phases is dependent of the size of the molecules in the substance.
B. The strength of the forces between molecules in a substance depends on the number of filled electron shells.
C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
D. The strength of the forces between molecules in a substance is the strongest at higher temperatures.
•
•
•
*2. Which list shows the phases of matter in order from strongest collective electrostatic forces to weakest collective electrostatic forces?
A. Gas, solid, liquid
B. Gas, liquid, solid
C. Liquid, solid gas
D. Solid, liquid, gas
•
•
•
*3. Which change happens when water boils?
A. The forces between water molecules become stronger, and the bonds between atoms in the water remain unchanged.
B. The forces between water molecules are unchanged, and the bonds between the atoms in a water break.
C. The force is between water molecules in the bonds between the atoms in the water molecules break.
D. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
•
•
•
*4. A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?
A. The forces weaken, and the molecules move around.
B. The molecules break apart and then form stronger forces.
C. The forces strengthen, and the molecule structure becomes more rigid.
D. The molecules vibrate more and weaken the forces.
•
•
•
*5. The boiling point of acetone is lower than the boiling point of ethanol. Based on this information, which conclusion can be drawn about the two substances?
A. The intramolecular bonds in acetone are stronger than the intramolecular bonds in ethanol.
B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
C. The intramolecular bonds in ethanol are stronger than the intramolecular bonds in acetone.
D. The intermolecular forces in acetone are stronger than the intermolecular forces in ethanol.
Answer:
see below
Explanation:
1. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
2. solid, liquid, gas
3. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
4. The forces strengthen, and the molecule structure becomes more rigid.
5. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
The the degree of intermolecular interaction between molecules determines the magnitude of boiling point of the substance.
During phase change, a substance moves from one state of matter to another. The temperature at which a phase change occurs is determined by the strength of the forces between molecules in the substance. The relative magnitude of intermolecular forces between molecules in different states of matter is solids > liquids > gases.
During boiling, energy is imparted to the molecules of a liquid. When this occurs, the forces between water molecules break, and the bonds between the atoms in water are unchanged.
We must recall that the molecules of a substance are in constant random motion. The average kinetic energy of molecules is proportional to temperature. As a sample of calcium carbonate is cooled, the forces between molecules strengthen, and the molecule structure becomes more rigid.
The magnitude of intermolecular interaction affects the boiling point of a liquid. The stronger the magnitude of intermolecular interaction,the higher the boiling point. As such, ethanol having hydrogen bonds between its molecules has a higher boiling point than acetone which only posses weaker dipole - dipole interactions.
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Which of the following correctly describes the law of conservation of matter?
O Matter makes up 98% of stuff in the universe, so it has to be created and destroyed sometimes
O Matter can be destroyed during a chemical reaction as long as it is created again in a different reaction
O Matter can only be created, but not destroyed in chemical equations
O Matter can neither be created nor destroyed during a chemical reaction
Assertion is correct statement but reason is wrong statement.
Assertion is correct statement but reason is wrong statement.Matter can neither be created nor destroyed is a statement of the law of conservation of mass.
Matter can neither be created nor destroyed is a statement of the law of conservation of mass.The assertion is correct but the reason is incorrect.
A chemical reaction occurs when _________.
A. Chemical Bonds are build
B. A new substance is created
C. Chemical Bonds are broken
D. All of the Above
Answer:
C. Chemical Bonds are broken
Explanation:
A chemical reaction occurs when chemical bonds are broken.
Chemical reactions occur when chemical bonds between atoms are formed or broken.
Hope this helps :)
Answer:
c: chemical bonds are broken
Explanation:
the broken bonds then create new bonds, rearranging the atoms into a new substance :)
Phản ứng phân hủy của 1 este trong môi trường kiềm: RCOOR’ + NaOH → RCOONa + R’OH
Để một nửa lượng ban đầu của RCOOR’ và NaOH chuyển thành sản phẩm ở 270C cần thời gian là 200
phút. Hỏi ở 570C cũng để chuyển một nửa lượng ban đầu của RCOOR’ và NaOH thành sản phẩm thì cần
bao nhiêu phút? Cho biết hệ số nhiệt độ của phản ứng trên = 2,8.
If acid comes in contact with your skin, why must you flush the area with plenty of cold water, rather than neutralizing the acid with a base?
Answer:
that would just create a bigger mess if you flush it with ice water it can reduce swelling and help dull your nerves
Explanation:
If acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.
What is acid?A chemical species known as an acid absorbs electrons and/or provides protons or hydrogen ions. When a hydrogen atom is bound to an acid, it can release (dissociate) and produce a cation as well as an anion in water. A substance's acidity and solution pH increase according to the amount of hydrogen ions it produces.
There are various definitions for acids. When someone uses the term "an acid," they typically mean an Arrhenius or Brnsted-Lowry acid. Often, a Lewis acid being referred to as a "Lewis acid." If acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.
Therefore, if acid comes in contact with your skin, because having an excessive amount of base can also be harmful. Acid is weakened and rendered ineffective by water.
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some uses of sodium bicarbonate
Answer:
Sodium bicarbonate is an antacid used to relieve heartburn and acid indigestion. Your doctor also may prescribe sodium bicarbonate to make your blood or urine less acidic in certain conditions. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
Two students are identifying a sample of tap water.
Student A says that tap water is a mixture, while
Student B says that it is a compound. Which student
is correct? Justify your answer.
Tap water is a mixture not compound due to presence of many substance.
Tap water is an example of mixture not compound because in tap water, water is not available in pure form, it has many substances mix with water and those substances make no bond with water.
It has dissolved compounds like calcium carbonate, magnesium and fluoride. Different elements or compounds are physically combined rather than chemically linked together so we can conclude that student A is correct that tap water is a mixture.
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help! ill give brainliest
Answer:
Option B
Explanation:
Magnesium is an alkali earth metal and chlorine is a nonmetal. Due to this, and their differences in electronegativity, the elements form an ionic bond. Since magnesium has two valence electrons, it will give them up to two chlorine atoms (which has 7 valence electrons), which needs them to complete its octet. From this, magnesium forms a cation, and will have the ion formula Mg(2+). The two chlorine atoms form anions, and will have the ion formula Cl(1-).
Terms:
Cation: a positively charged ionAnion: a negatively charge ion.Electronegativity: the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.