Answer:
Gas is more open particles
Explanation: gas can flow
How can the motion of atoms in the solid state of most substances be described?
Answer:
The molecules in a solid are stuck in a specific structure or arrangement of atoms. The atoms still vibrate and the electrons fly around in their orbitals, but the entire atom will not change its position.
A boy jumps into a cold swimming pool and his body temperature goes down. His muscles, blood vessels, and nervous system work together to restore his body temperature. These responses allow the body to maintain--- Select one: stress balance work structure
Answer:
balance
Explanation:
Which of the following is an example of a Lewis base?
O A. H+
B. BF3
O C. NH3
O D. H20+
Answer:
O C. NH3 is an example of a lewis base
Use the drop-down menus to select the correct answers to complete the paragraph.
The building blocks of matter are called . A substance made up of the same kind of atoms is called a(n) . elements lose particles. This makes them .
Explanation:
The building blocks of matter are called atoms
A substance made up of the same kind of atoms is called a element
unstable elements lose particles
This makes them radioactive
(i dd the assignment)
The correct words are:
AtomsElementParticlesRadioactiveAn atom is the smallest and indivisible part of matter.An element is made up of atoms with an equal amount of protons in them. A particle is what makes up an element.Radioactivity occurs when there is a sudden burst of radiation.Read more here:
https://brainly.com/question/24612906
2NaOH + H2SO4 > Na2SO4 + 2H2O
If you begin with 100 g of each reactant, how many moles of water will be formed?
Answer:
To calculate the number we need molar mass.
Which of the following are incorrectly paired?
A) Mercury, Hg
B) Potassium, K
C) Tungsten, T
D) Tin, Sn
E) Antimony, Sb
Answer:
C
Explanation:
Tungsten is the 74th element on the periodic table and the letter is "W"
chemistry neutralization
Answer:
In chemistry, neutralization or neutralisation is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.
Explanation:
All of the following use digitized signals to encode and transmit information EXCEPT:
Select one:
Fiber optic cables
Record players
Wi-Fi devices
Flat screen TVs
Answer:
Record players
Explanation:
In a record player, a stylus vibrates as it follows a spiral groove cut into the surface of the rotating record.
The vibrations (analogue) are converted into electrical signals and fed into an amplifier to produce the sounds you hear
Fiber optic cables, Wi-Fi devices, and flat screen TVs use digitized signals to encode and transmit information
You take a very hot block of metal on top of a cold block of metal. What will
happen to the temperature of both blocks over time?
Answer:
They will both cool down overtime
Explanation:
Once you put something that is hot on something that is cold. They will both be hot, but overtime they will cool down. It can't stay hot forever.
Answer:
Hey!
Your answer is that one block of metal (the cold one) would heat up a bit whilst the other block (the hot one) would cool down...This is because of the metal's CONDUCTIVITY!
Explanation:
Eventually you would measure the temperature of both blocks and they will reach the same temperature. After this they will naturally cool down...
HOPE THIS HELPS!!
A pelican is born with a larger bill than other pelicans of the same species. When this pelican
breeds, some of its offspring also have larger bills. What is the most likely explanation for the
larger bills in the pelican and its offspring?
Inheritance of an quoted trait
A mutation
Natural selection
A change in diet
Answer:
natural selection
Explanation:
it is a biological selection of genes, whether dominant or negative.
Where does your body get the energy needed to transform into kinetic energy to move around all day
Answer:
food, mostly consists of what you eat.
Explanation:
The body get the energy needed to transform into kinetic energy from food.
Food:Every body part (muscles, brain, heart, and liver) need energy to work. This energy comes from the food we eat. Our bodies digest the food we eat by mixing it with fluids (acids and enzymes) in the stomach.
The main sources of energy are: carbohydrates, lipids, and proteins.
Find more information about Food here:
brainly.com/question/25884013
_____________ is the energy stored because of its position or shape.
A. Potential energy
B. Kinetic energy
C. Thermal energy
D. Chemical energy
Answer:
Potential Energy is the energy stored because of its position or shape
Explanation:
What happens to Cr3+ ion when it
is converted to Cro42-
Its oxidation number decreases and undergoes reduction
explain a natural process, while
describe a natural process.
Answer:
a natural process is water cycle.
Explanation:
during this process,water evaporates from different water bodies ,when the warm water rises,the cold and heavier water comes down to take its place.On the other hand,the warm water on rising,changes to water vapour.
This water vapour helps in the formation of clouds .
When the cloud becomes heavy and is not able to hold the water vapour, it falls down as rain or snow depending upon the climate and atmospheric temperature.
This process continues over and over again
If we start with 1.000 g of strontium-90, 0.908 g will remain after 4.00 yr This means that half-life of strontium-90 is _________ yr.
A) 3.05
B) 4.40
C) 28.8
D) 3.63
E) 41.6
Answer: C) 28.8
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = initial amount of the reactant = 1.000 g
a - x = amount left after decay process = 0.908 g
a) to find rate constant
[tex]4.00yr=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
[tex]k=\frac{2.303}{4.00}\log\frac{1.000}{0.908}[/tex]
[tex]k=0.024yr^{-1}[/tex]
b) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{0.024yr^{-1}}=28.8yr[/tex]
The half-life of strontium-90 is 28.8 yr.
A student observes the chemical process described by this equation:
4Al + 3O2 → 2Al2O3
How does the mass of the new substance compare to the total mass of the starting materials?
Answer:
Both are equal
Explanation:
Mass of starting material i.e Aluminium is [tex]4.480 * 10^{-23}[/tex] grams
The weight of oxygen is [tex]2.65 * 10^{-23}[/tex]
There are 4 atoms of aluminium and 3 atoms of oxygen
Thus, the total mass of starting material is
[tex]4 *[/tex] mass of one atom of aluminium [tex]+ 6 *[/tex] mass of one atom of oxygen
[tex]4 * 4.480 * 10^{-23} + 6* 2.65 * 10^{-23}[/tex]
[tex]35.1 * 10^{-23}[/tex] grams
Mass of new substance is also equal to
[tex]4 *[/tex] mass of one atom of aluminium [tex]+ 6 *[/tex] mass of one atom of oxygen
[tex]4 * 4.480 * 10^{-23} + 6* 2.65 * 10^{-23}[/tex]
[tex]35.1 * 10^{-23}[/tex] grams
Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?
OA.
There are six parent carbon atoms and one triple carbon bond.
There are six parent carbon atoms and one double carbon bond.
B.
C. There are seven parent carbon atoms and one triple bond.
D. There are eight parent carbon atoms and all single carbon bonds.
E.
There are eight parent carbon atoms and one triple bond.
Answer:
Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?
A.There are six parent carbon atoms and one triple carbon bond.
B.There are six parent carbon atoms and one double carbon bond.
C. There are seven parent carbon atoms and one triple bond.
D. There are eight parent carbon atoms and all single carbon bonds.
E.There are eight parent carbon atoms and one triple bond.
Explanation:
The correct answer is A. The prefix "hex-" indicates that there are six carbon atoms in the molecule, and the suffix "-yne" indicates that there is a triple bond between two of the carbon atoms. Therefore, hexyne has six carbon atoms and one triple bond.
A geologist took this aerial photo of a location where a river flows out of a mountain range.
What feature is pictured here?
alluvial fan
delta
flood plain
oxbow lake
Answer:
A alluvial fan
Explanation:
A geologist took this aerial photo of a location where a river flows out of a mountain range. The feature of the picture is fan. Hence option a is correct.
What is geologist?Geologist is defined as a scientist who focuses on the processes that shape terrestrial planets and the solid, liquid, and gaseous materials that makes up Earth. Geologists study the elements, processes, results, physical properties, and history of the planet.
Fan is defined as a buildup of sediments that spreads out from a concentrated supply of sediment, such as a small canyon that emerges from a cliff. As long as these three conditions are met, Fans can form at any elevation: water running is present.
Thus, a geologist took this aerial photo of a location where a river flows out of a mountain range. The feature of the picture is fan. Hence option a is correct.
To learn more about geologist, refer to the link below:
https://brainly.com/question/13428729
#SPJ6
A student investigates a pure metal, X. The student takes a 100.0 g piece of metal X, heats it
to 500.0°C, then places it on a 1000.0 g block of ice at 0.0°C. The ice partially melts, and
the final temperature of the metal, ice, and melted water is 0.0°C. The student calculates the
experimental value of the specific heat capacity of metal X and records it as
0.90 J/(g • °C).
(C) Calculate the magnitude of the energy change of metal X during the experiment.
(d) Calculate the mass of ice melted by metal X. (The enthalpy of fusion of ice is 330J/g.
(e) A student claims that the energy transferred to the ice breaks the polar-covalent O-H
bonds found between atoms within water molecules. Do you agree or disagree with this
claim? Justify your answer.
Answer: The answer would be D
Explanation:
The magnitude of the energy change of metal X during the experiment is 6500 J, and the mass of ice melted by metal X is 19.7 g and the claim of the student is correct.
What are changes in ice?The magnitude of energy change of metal is equal to the mass of metal x specific heat capacity of metal x temp. difference
= 100 g x 0.13 J / ( g- oC) x (500 - 0) oC
= 6500 J
According to the question, the enthalpy of the fusion of ice is 330 J / g
Thus 330 J heat is used to melt 1 g of ice
So 6500 J heat is used to melt = 1 x (6500 / 330) = 19.7 g ice
Although hydrogen bonds can form in both a solid and a liquid state, they are more stronger in the solid state. In order to partially dissolve its hydrogen bonds and turn solid ice into liquid water, whatever heat is applied to it is therefore used.
Therefore, the student's assertion is true.
Learn more about ice, here:
https://brainly.com/question/15855308
#SPJ5
(7.02 LC) Which statement about this reaction is correct?
Answer: The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be positive.
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l)[/tex] [tex]\Delta H=-890kJ[/tex]
on halving the reaction, enthalpy also becomes half
[tex]\frac{1}{2}CH_4(g)+O_2(g)\rightarrow \frac{1}{2}CO_2(g)+H_2O(l)[/tex] [tex]\Delta H=-445kJ[/tex]
Thus The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Which of the following is the best indication that a chemical change has taken place?
a. The matter changes color.
b. A mixture separates into layers.
c. The change is reversible.
d. The shape of the substance changes.
Answer:
C
Explanation:
It is C because the change is inversible, that means that it is a chemical change.
how does atomic spectrum differ from continuous spectrum
Answer:
A continuous spectrum is a record formed by collecting light of all frequencies traveling through space together. ... A line spectrum is a record formed by collecting light emitted from excited atoms whose electrons are falling back down to lower energy states.
Explanation:
How do you convert kilometers to grams
By multiplying the mass value by 1000.
Answer:
Hey!
What you have to do is to multiply the amount of mass * i.e. 67.9g * by 1000 * 67,900kg! *
Explanation:
HOPE THIS HELPS!
Why were scientists surprised to find coal in the arctic?
Answer:
coal is made from compressed plant matter and how exactly did plants grow on the surface of an ocean. (as there is no land mass beneath the arctic.)
Explanation:
it would be like finding a fly in an ice cube to simplify it.
They were surprised to find coal in arctic because ordinarily coal was supposed to be found in warm or hot environments and not cold region like the arctic.
The arctic is located at the far northern part of the world which is characterized by its extreme cold weather.
A limited vegetation of plants such as grasses, mosses and lichens are found in this region irrespective of the extreme cold weather through out the year.
Coal is a type of fuel gotten from fossils and deposits of plant vegetation.
Scientist has discovered that continents do move over time through a process called continental drift. This is the reason why limited vegetaion is found in the arctic leading to the formation of coal.
Learn more here:
https://brainly.com/question/22647554
Use the information below, to write a word equation, then change it into a balanced symbol equation.
1) Magnesium reacts with Hydrochloric acid to make magnesium chloride and hydrogen gas
Answer:
Mg + 2HCl -> MgCl2 + H2
Explanation:
Is the relationship between the amount of gas and pressure direct or indirect?
Explain your answer
Answer:
A law that states that at constant temperature, the volume of a fixed amount of a gas is inversely proportional to its pressure. A law that states that at constant temperature and pressure, the volume of a sample of gas is directly proportional to the number of moles of gas in the sample.
Explanation:
1. Which gas will move faster through a small opening hydrogen or oxygen? *
A)hydrogen
B) oxygen
Answer:
hydrogen
Explanation:
Using tongs, place the 250 mL beaker on the hotplate.
Temperature of the water: 65
°C. Reaction time:
seconds
Answer:
first question: temp: 40, time: 26.3
second question: temp: 65, time: 14.2
Explanation:
for edge 2021
After a copper smelter begins operation, local downwind populations of plants begin to adapt to the resulting air pollution. Scientists document, for example, that the acid tolerance of several plant species has increased significantly in the polluted area. This is an example of...
artificial selection
over production
selective breeding
natural selection
Answer:
natural selection (directional selection).
Explanation:
Natural selection: In biology, the term "natural selection" is described as one of the central concepts associated with evolution. Through the process of natural selection, different organisms having favorable traits are most likely to reproduce. However, these organisms then pass the given traits to their next or coming generation. The process of natural selection allows different organisms to adapt to their specific environment.
Directional selection is considered as one of the different modes of natural selection.
In the question above, the given statement represents a natural selection.
Which is usually associated with a slower reaction rate?
A. using a whole solid in the reactants
B. adding heat energy to the reactants
C. adding food coloring to the reactants
D. using a strong solution of the reactants
