Answer:
B. Internal pressure of the balloon decreased due to lower kinetic energy.
Explanation:
The balloon shrank when moved from the warm room to the cold refrigerator because the internal pressures of the balloon decreased due to lower kinetic energy.
As the balloon approaches the refrigerator, the particles begins to lose their heat energy. The kinetic energy of the particles in a body is directly proportional to the amount of heat. Since we move from a warm to a cold place, the kinetic energy drops too.How many atoms are in a sample of 2.89 moles of potassium (K)?
Answer:
The answer is
1.74 × 10²⁴ potassium atomsExplanation:
To find the number of atoms given the number of moles we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.89 moles
We have
N = 6.02 × 10²³ × 2.89
We have the final answer as
1.74 × 10²⁴ potassium atomsHope this helps you
84. Predict how many electrons each element will most likely
gain or lose.
(a) I
(b) Ba
(c) Cs
(d) Se
Answer:
I will gain 1 electron
Ba will lose 2 electrons
Cs will lose 1 electron
Se will lose 2 electrons
Explanation:
Which postulate of the kinetic-molecular theory applies to the particles of a liquid?
They do not move freely but vibrate in a stationary position.
They can be compressed, which causes a large change in volume.
They have so much kinetic energy that their intermolecular forces are negligible.
They have enough kinetic energy to easily slide by each other.
The particles of liquid have enough kinetic energy to easily slide by each other. The correct option is D.
What is kinetic-molecular theory?The kinetic-molecular hypothesis stated matter states and is based on the assumption that matter is made up of tiny particulate that are constantly in motion.
This theory adds to the knowledge of observable properties and behaviors of solids, liquids, and gases.
Because they are densely packed and vibrate in place, solids have the lowest kinetic energy.
Since liquids have higher kinetic energy, the particles slide past each other. Because gases have the most kinetic energy, they float around in the air.
Particles in liquids are very close together and move randomly throughout the container.
Due to the shorter distances between particles, particles move rapidly in all orientations but strike with each other more frequently than in gases.
Thus, the correct option is D.
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All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down an object, what is most likely true about the surface the object is moving on? The surface is dry. The surface is rough. The surface is uneven. The surface is smooth.
The question is incomplete, the complete question is;
All surfaces have texture, which means it affects how things move over it. When it takes a long time for friction to slow down and object, what is MOST LIKELY true about the surface the object is moving on? (A) The surface is dry (B) The surface is rough (C) The surface is uneven (D) The surface is smooth
Answer:
(D) The surface is smooth
Explanation:
Friction exists because of relative motion between two surfaces in contact with each other. However the magnitude of friction depends on how rough or smooth the surface is.
For smooth surfaces, there is little or no resistance to motion as objects move over the surface. Hence objects take a longer time to slow down on a smooth surface due to very little friction.
On a rough surface, objects tend to slow down relatively quickly. Hence, less resistance to motion on a smooth surface makes an object to take a longer time to slow down on a smooth surface than on a rough surface.
Answer: D
Explanation: Because if the surface is smooth it causes it to be more even for it to be able to cause Friction
if you find this helpful, Your welcome, if not, sorry.
The research and design team of a car manufacturing company is developing a new safety product that automatically
tests a car's brakes. When the team discusses how exactly they plan to determine whether the new technology is
successful or not, what stage of technological design are they in?
O first
O second
third
O fourth
The team should discuss the plan to determine whether the new technology is successful or not in the fourth stage. The correct option is D.
What are different stages of technology testing?When a company manufactures any item, he test it before sending it to the market. This is called technology testing. The test goes from four stages. Here, the item is car's break.
Thus, the correct option is D, fourth stage.
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What is the length of one mole of the typical cell phone that is approximately 15 cm in length?
i dont know how to remove my answer so ignore this
Answer:
Some objects of more than 15 cm and less than 30 cm can be:
A rule.
A cell phone.
A pencil.
A calculator.
A laptop charger.
We have to measure it helps us to compare and to obtain physical magnitudes of different objects.
Measurement is the action of obtaining a representative magnitude of a particular object, now, to measure we need to compare and have reference points.
See more at brainly.lat/tarea/3935004.
Explanation:'
I hope my answer is to your liking; 3 gi v me a crown, please
Which three types of electromagnetic waves have longer wavelengths than the waves that make up visible light ?
O radio waves, gamma rays, X-rays
O gamma rays, infrared light, X-rays
microwaves, radio waves, infrared light
O infrared light, ultraviolet light, microwaves
Answer:
C
microwaves, radio waves, infrared light
Explanation:
Three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves, and infrared light.
Electromagnetic waves
Electromagnetic waves are type of waves that do not require material medium for their propagation.
The frequency of the wave decrease with increase in the wavelength of the wave.
Also, the wavelength of the wave decreases with increase in the frequency of the wave.
Examples of electromagnetic spectrum arranged in increasing wavelength
Gamma rayX rayUltra violet rayVisible lightinfraredmicrowaveRadio wavesThus, three types of electromagnetic waves that have longer wavelengths than the waves that make up visible light are microwaves, radio waves, and infrared light.
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What compound/element is this?
(Easy)
Answer:
C₃H₆ propene
Explanation:
Find the chemical formula by adding all the carbon and then all the hydrogen together.
The relationship between a carnivore and an herbivore can be started as
Answer:
Herbivores
Explanation Herbivores are the animals that rely on plants for their nutrition or food. Carnivore are the animals that prey upon herbivore to survive.
meaning of carbon cycle
The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms
4 steps of Carbon Cycle
Photosynthesis, Decomposition, Respiration and Combustion.
Select the molecular shape of each molecule based on the formula or Lewis structure.
Answer:
1. linear (A)
2. trigonal-planar (C)
3. tetrahedral (B)
4. linear (A)
Explanation:
Just did it on Edge 2020
The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.
The Valence Shell Electron Pair repulsion theory gives us a basis for predicting the shape of molecules. The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.
In the image shown, We can see that in HCN , carbon is the central atom and is surrounded by two atoms and no lone pairs. Since there are two electron domains around the central atom, the molecule is linear.
In the second structure, BH3 has boron as its central atom. Three electron domains surround the central atom hence the molecule is trigonal planar.
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A gas of 3.4 moles occupies of a volume of 25 Liters. How many moles will occupy 50 Liters?
Answer:
n₂ = 6.8 mol
Explanation:
Given data:
Initial number of moles = 3.4 mol
Initial volume = 25 L
Number of moles = ?
Final volume = 50 L
Solution:
According to Avogadro law,
V₁/n₁ = V₂/n₂
Now we will put the values in formula.
25 L/3.4 mol = 50 L/ n₂
n₂ = 50 L× 3.4 mol/25 L
n₂ = 170 L.mol/25 L
n₂ = 6.8 mol
Matter is anything that takes up space and can be described by physical and chemical properties. Which statement
BEST differentiates chemical properties from physical properties?
A)
Physical properties are properties that can be physically seen or touched,
while chemical properties can only be found when matter is mixed with
specific chemicals.
B)
Physical properties are measured when matter changes its physical state,
while chemical properties can only be measured if matter remains in one
state for an extended time.
C)
Physical properties are difficult to measure because they require special
tools to detect, and chemical properties are easy to measure and require
not special tools to detect.
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Answer:
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
1 = These changes were reversible.
2= They have same chemical property.
3= These changes can be observed with naked eye.
Example :
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
1 = These changes are irreversible
2 = These changes occur due to chemical reactions
3 = These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) → 2H₂O (l)
Which of the following statements best describes how the compound sodium chloride is formed?
Select one:
a. Sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
b. Sodium takes one electron from chlorine, forming a sodium ion with a negative one charge and a chloride ion with a positive one charge.
c. Sodium and chlorine share protons.
d. Sodium shares one electron with chlorine.
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Actually Welcome to the Concept of the Ionic Compounds
since the compound NaCl is a ionic compound, both should have ionic charges, hence they are shown as
Na+ Cl-
The correct option is a.)
a.) Sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
The correct answer is sodium transfers one electron to chlorine, forming a sodium ion with a positive one charge and a chloride ion with a negative one charge.
How sodium chloride is formed?Sodium chloride is a chemical made up of sodium and chloride ionic bonds. When sodium atoms interact with chlorine atoms, sodium chloride is generated. Chlorine will get an electron (a negatively charged particle) from sodium. As a result, sodium becomes slightly positive and chlorine becomes slightly negative. Sodium is reduced in this process because it provides an electron, while chlorine gains an electron and is oxidized.Learn more about ionic compounds here:
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What are diatomic molecules and are they compounds? PLEASE ANSWER ASAP!!
Answer:
Diatomic molecules consist of two atoms that are chemically bonded. The two atoms can be the same or different chemical elements. As for whether or not they are compounds, there is not technically an answer. This is because all compounds are molecules, but not all molecules are compounds. For example diatomic molecules that comprise the chemical compounds nitric acid, carbon monoxide, and hydrogen chloride are made up of two different elements. As you can see, most diatomic molecules are not made up of the same kind of elements and not every diatomic molecule comprises a chemical compound.
hope this helps :)
Explanation:
How could you measure the average kinetic energy of a group of particles
Answer:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy.
Explanation:
oxidation is a example of ?the answer choices are are here
A.a financial property,B.a chemical property,C.cool science stuff,D.a physical property
Answer:
B. a chemical property
Explanation:
Oxidation requires a chemical reaction to occur, therefore it is a chemical property.
engineers create a new metal that i stronger than steel but much lighter
Answer:
Yes. True
Explanation:
Yes, this is true that engineers can make a lighter, cheaper, stronger material. Currently this metal is used for aircraft, and is easy to manufacture.
4
The element bromine at room temperature is a liquid with a density of 3.12 g/nl.
Calculate the mass (wanted measurement) of 125 mL (given measurement) of bromine.
(use the given density as the conversion factor to calculate the wanted measurement).
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Sunlight shining through a clear window it’s Jeremy’s face while he does his homework he uses a large wooden wooden block to cover the window what do the wooden block in the clear window demonstrate
I've asked before and gotten spammed hopefully I won't get spammed this time please help me with this someone. pls help anyonw
Answer:
See below!
Explanation:
A. The picture of the graph is attached. You can tell the amount of protons in an element by looking at the periodic table. The elements are ordered by the number of protons in an element.
B. Carbon and silicon are at the peaks of the chart. The peak is the highest point in a graph.
C. The elements belong to the non-metal group.
D. The halogens are non-metals, and their vapors are colorless.
The halogens are toxic to humans.
Halogen molecules are made of two atoms; they are diatomic.
Halogens react with non-metals to form crystalline compounds that are salts.
The halogens get less reactive going down the group on the periodic table.
Halogens can bleach vegetable dyes and kill bacteria.
E. The picture of the table is attached. To figure which numbers to put where, you need to pay attention to the other numbers. The halogens follow a trend with each of these properties. You have to put in the numbers that fit in among the other numbers.
Which of the following is/are correct about light?
A.
Light always travels at the same speed.
B.
Light cannot travel through liquids.
C.
Light energy travels as waves.
D.
all of these
Answer:
D. Light energy travels as waves.
HELP QUICK What is the mass of an object that has a volume of 2 ml and a density of 10g/ml?
Answer:
The answer is 20 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 10 × 2
We have the final answer as
20 gHope this helps you
PLSSS HELP WILL GIVE A LOOT OF POINTS
The diagram below shows two metal plates at different temperatures. Plate X is 30 degrees Celsius ( oC) and Plate Y is 50 degrees Celsius ( oC).
A.Plate X will become cooler and Plate Y will become cooler.
B.Plate X will become warmer and Plate Y will become cooler.
C.Plate X will become cooler and Plate Y will become warmer.
D.Plate X will become warmer and Plate Y will become warmer.
Answer:
I think B but I'm not sure.
Answer:
C.
Explanation:
How many significant figures does this measurement contain? 0.0000508800 Gm
Answer:
There are 6 significant figures
Answer:
6 significant figures
Explanation:
When counting significant figures, start on the left with the first non-zero number. Count all numbers that fall between non-zero numbers. Count all zeros after a 1-9 and after the decimal.
What is the negatively charged sub-atomic particle of an atom?
A) Proton
B) Neutron
C) Electron
According to the rules covered in this class, which of the following ionic compounds is named incorrectly?
cobalt(II) oxide
nickel(II) sulfide
copper(II) selenide
zinc(II) telluride
All of these names are correct.
Answer: is copper(ll)selenide
Explanation:
is copper (ll)selenide
i hope this help
Which of the following has a higher electronegativity oxygen or selenium?
Answer: Oxygen
Explanation: Oxygen has more ionisation energy and Oxygen has a small size which makes it more electronegative.
Are hemoglobin formation and functioning brains and muscles benefits of Iron?
there about 5000 elements, which combine to form the vast number of diffrent substances in the world around us
Answer: false 100
Explanation:
if this is the true or false test here
