During a chemical reaction, no atoms are destroyed or created. The change occurred in the given reaction is the regrouping of atoms of the reactants.
What is a chemical change?A change by which a bond between two atoms is created or breaks called chemical changes. All chemical and biological reactions are example of chemical changes.
According to law of conservation of mass proposed by Antoine Lavoisier mass is neither created nor destroyed. Thus the total mass in a reaction is conserved.
The mass in reactant side must be equal to the mass in the product side in a balanced reaction. Thus no atoms crated or destroyed.
Therefore, option A is correct, that is atoms are regrouped between reactants during a reaction to get new products with same mass as that in product side.
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help please, thank you !!
Answer:
5
Explanation:
Which of these is an example of solar energy?
A) heating a pot of water on a stove
B) heating water in the sun to make tea
C) cooling a house with an electric fan
D) cooling a house by pulling down shades
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Group the labels according to the type of waves they describe.
Mechanical waves can transmit through a medium and electromagnetic waves can travel in vaccum and both can transfer energy.
What is mechanical waves?Mechanical waves are those waves in which oscillation of matter takes place in any medium.
Electromagnetic waves are those in which electric field and magnetic field are present in the perpendicular direction to each other and also able to propogate in vaccum medium.
Both waves can transfer energy and travel in the transverse direction.
Hence mechanical waves can transmit through a medium and electromagnetic waves can travel in vaccum.
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what is the volume of a marble that has a mass of 3.g and a Density of 2.7 g/ml ?
make sure to round to the nearest tenth
Answer:
1.111 or since you want me to round 1.1 if not right let me know please.
Explanation:
Answer:
1.1
Explanation:
all you have to do is divide the mass by density to get the volume yurr
What is the difference between liquid, molten steel, and solid steel?
energy
the material it is made out of
Answer:
For example, the particles in solid steel are closer together than the particles in molten—or melted—steel. However, water is an important exception. The molecules that make up ice actually have more space between them than the molecules in liquid water do.
Explanation:
The statement is "energy of atom."
What is atom?An atom is smallest unit of ordinary matter that forms a chemical element.
The atom in solid steel are moving more slowly than the atom in liquid steel.
The particles in solid steel are closer together than the particles in molten steel.
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Henry is in the community investigating sources of chemical energy for his science experiment. Select the best examples of chemical energy Henry can use.
A gas station and people playing hopscotch
A squirrel eating acorns and a fire burning
Someone reading a book and eating a sandwich
Someone sliding down the slide and someone drinking water
Answer:
B
Explanation:
Explain the change that occurs in the molecules of water as it moves from a solid to a liquid to a gas
Answer:
Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.
The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called the enthalpy of fusion (or heat of fusion) of the substance, represented as ΔHfus. Some ΔHfus values are listed in Table 10.2 “Enthalpies of Fusion for Various Substances”; it is assumed that these values are for the melting point of the substance. Note that the unit of ΔHfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The ΔHfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so ΔH will be positive), while solidification is always exothermic (so ΔH will be negative).
Table 10.2 Enthalpies of Fusion for Various Substances
Explanation:
PLEASE HELP! THIS IS DUE IN 10 MINUTES! (15 POINTS)
What did Democritus, Dalton Thompson, Rutherford and Bohr have in common?
A. They each identified new elements
B. They each identified new isotopes of atoms
C. They each contributed to the development of the atomic theory
D. They each contributed experiments in which particles collided.
Answer:
C.they each contributed to the development of the atomic theory
Explanation:
Would anyone help
!!!!!
Answer
Explanation:
Protons would be the first answer since protons have a + charge. Neutrons would be second sicne neutrons have a neutral or 0 charge. Electrons would be the last since electrons have a - charge.
Answer:
Explanation:
mhmmmmmmm yeah i do not know sorry thx for the points :P
For the equation 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O, how many units of NO3 are represented on the products side?
Answer:
6
Explanation:
Which form of energy is stored chemical energy and example of?
Kinetic energy
Potential energy
Gravitational energy
Powered energy
Answer:
D
Explanation:
I THINK. HOPE THIS HELPS
How many atoms are in C₆H₁₂O₆
Answer:
There are 24 atoms in one molecule of C6 H12 06. This chemical compound has 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.
Answer:
1 molecule of glucose contains 6 atoms of C, 12 atoms of H, and 6 atoms of O • 1 mole of glucose contains 6 moles of C atoms, 12 moles of H atoms, and 6 moles of O atoms.
Explanation:
The phase of matter can be changed by:
a) increasing temperature
b) decreasing mass
c) increasing volume
d) all of the above
Answer: A
Explanation: Mass and volume is the amount, amount doesn’t make the phase of a matter change.
PLEASE HELP!!! I WILL GIVE BRAINLIEST TO 1ST PERSON!!!
A balloon filled with gas has a mass of 5 g. If the balloon is heated the mass of the balloon will:
--
A.) remain 5g
B.) decrease
C.) increase
Answer:
I believe the answer would be A, remain 5g because heating the balloon would increase the speed of the gas molecules, but not necessarily change the amount
Answer:
decrease
Explanation:
The ballon will most likely pop causing it to decrease in mass.
Ok this is the last one.
Answer:
2
Explanation:
What is chemical energy?
A Energy that is stored or released during a chemical reaction
B Energy that is destroyed during a physical change
C Energy that is released during a phase change
D Energy that is created when a substance is being burned
Answer:
A
Explanation:
Is a comet found between Mars and Jupiter
Please make sure you are correct
Thank you
What happens when nitrogen fills its valence shell?
A) Three electrons are gained, creating N−3.
B) Three electrons are gained, creating N+3.
C) Three electrons are lost, creating N−3.
D) Three electrons are lost, creating N+3
When nitrogen fills its valence shell, three electrons are gained, creating N-3. Thus, the correct option for this question is A.
What is a Valence shell?A valence shell may be defined as the outermost shell of an atom that significantly contains valence electrons. This shell is actively involved in the pairing and sharing of elements from one another.
The atomic number of nitrogen element is 7, and its electronic configuration is [tex]1s^2, 2s^2, 2p^3[/tex]. From this electronic configuration, we come to know that the number of electrons present in the outermost shell or valence shell of nitrogen is 5.
In order to fulfill its valence shell and obtain stability, it requires three electrons to fulfill its octet. These three electrons are gained, and thus creating N−3.
Therefore, three electrons are gained, creating N−3 is the process that nitrogen performs after filling its valence shell. Thus, the correct option for this question is A.
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A student uses red litmus paper to test the pH value of different solutions. Which would result in a color change of the litmus paper?
soap
vinegar
lemon juice
antifreeze
The litmus paper shows red colour for acidic substances and blue colour for basic substances. Thus a red litmus paper will turn blue if it is dipped in an alkaline solution. Soap is alkaline and given blue color to litmus.
What is pH?pH of a substance is its measure of concentration of H+ ions in it. It is mathematically negative logarithm of H+ ion concentration. Thus, pH measures how much acidic or basic the solution is.
A pH of of 7 is neutral having no acidity or basicity. A pH less than 7 is acidic and pH greater than 7 is basic in nature. Vinegar is acetic acid and it shows less pH . Lemon juice also acidic since it contain citric acid whereas, soap is basic.
A litmus paper is used to identify whether a substance is acidic or basic. It shows red color for acidic solutions and blue for basic solutions. If the red litmus paper is dipped in acidic one, it shows no colour change if it is dipped in basic solution then it turns to blue.
Soap is highly alkaline and it changes red litmus paper to blue.
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PLEASE HELP! DUE IN 5 MINUTES! ( 10 points )
An atom of gold with 79 protons, 79 Electrons and 118 neutrons would have a mass number of....
A) 39
B) 158
C) 197
D) 276
Answer:
C
Explanation:
An atom of gold with 79 protons, 79 Electrons and 118 neutrons would have a mass number of 197 gold. Therefore, option C is correct.
What is mass number ?The total number of protons and neutrons in an atomic nucleus is known as the mass number, often known as the atomic mass number or nucleon number. In atomic mass units, it is roughly equivalent to the atom's atomic mass.
Because it indicates the mass of the entire number of protons and neutrons in an element, the mass number of an element is so named. The atomic number and atomic mass of an element are typically listed in periodic tables along with the chemical symbols for each element.
The third element in the periodic table's eleventh column is gold. It is under the transition metal category. The most common isotope of gold has 118 neutrons and 79 protons together with 79 electrons.
Thus, option C is correct.
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A space shuttle is covered with two layers of carbon. The two layers are the same size and have the same number of molecules. When the space shuttle is sitting on the ground, the layers do not touch, as shown in the diagram above. When the space shuttle takes off, the layers move so that they are touching. Use the information in the diagram to answer the question.
How does the temperature of the outer layer compare with the temperature of the inner layer before the layers touch? What will happen after the layers have been touching for a while?
Answer:due to the heat of it the molicules expand and therefor touch also on rentry due to heat
Explanation:
The characteristics of the thermal transfer process allow to find the results for the questions regarding the temperature in the two cases are:
When the material is separated, the transfer is carried out by radiation, the internal temperature rises slowly. When the material is bonded, the heat transfer is carried out by conduction, the interior temperature rises rapidly.
Thermal conduction processes are mechanical by which thermal energy (temperature) is transported, they ask to be of three types:
Conduction. When there is no displacement of matter, the energy is transported by the agitation of the molecules. Convection. When matter is transported, very important for liquids and gases. Radiation. When there is no physical contact and the energy is transferred by the radiation of electromagnetic waves.
At the initial moment the two layers are not touching, therefore the only possible process is radiation, therefore the outermost body may be at a very high temperature and the inner body may be cold since radiation heating is the less efficient.
When the materials touch, the energy transfer process is thermal conduction, therefore the interior temperature will increase significantly. The thermal conduction process is one of the fastest, therefore the temperature rises rapidly.
In conclusion, using the characteristics of the thermal transfer process, we can find the results for the questions regarding temperature in the two cases are:
When the material is separated, the transfer is carried out by radiation, the internal temperature rises slowly. When the material is bonded, the heat transfer is carried out by conduction, the interior temperature rises rapidly.
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Carlos is using the following images of a coal plant and a barbecue for his science investigation about chemical energy. Based on his observations, which statement most likely describes the conclusion of his investigation?
a coal plant
a barbecue
The images show examples of chemical energy being converted into heat and electrical energy.
The images show examples of mechanical energy being converted to heat energy.
The power plant and the barbecue convert electrical energy into chemical energy.
The power plant and the barbecue store heat energy and convert it to chemical and electrical energy.
I believe it is the first one, please correct me if I'm wrong.
Answer:
A
Explanation:
DAILY REMINDER ~ YOU ARE LOVED BY SOMEONE I HOPE YOU HAVE A WONDERFUL DAY BABES!
Answer:
THANK YOU
YOU TOO!
Explanation:
thank you
so much i hope you have a great day aswell
Can someone please explain how to solve it ?
Explanation:
40 m/s2
Formula for acceleration will be:
F = m*a
Force = mass*acceleration
•
•
F = m*a
= 40 * 180 - 140 = a
1600 = a
1600/40 = a
40 = a = 40 m/s2
What's a compound?
What's an element?
whatss a mixture?
Answer:
Compound: any substance composed of identical molecules consisting of atoms of two or more chemical elements.
Element: is a pure substance which cannot be broken down by chemical means.
Mixture: is a substance which consist of two or more elements or compounds not chemically combined together.
What happens when two areas of air have different pressures?
Why is the research of alternative energy resources important?
Fossil fuels are better for the environment over time.
Fossil fuels are a nonrenewable resource that won't last forever.
Alternative sources of energy produce too much pollution.
Answer:
Environmental and economic benefits of using renewable energy include: Generating energy that produces no greenhouse gas emissions from fossil fuels and reduces some types of air pollution. Diversifying energy supply and reducing dependence on imported fuels.
Explanation:
Answer:
b
Explanation:
PLEASE ANSWER!! All of the ecosystems on Earth make up the _________. A. biosphere B. atmosphere C. lithosphere D. Thermosphere
Answer:
biosphere
Explanation:
simple simple
Answer:
A or C but I think it's A
Explanation:
Which concept is a basis of the Declaration of Independence?
Answer:
Explanation:
Drafting the Declaration of Independence in 1776 became the defining event in Thomas Jefferson's life. Despite Jefferson's desire to return to Virginia to help write that state's constitution, the Continental Congress appointed him to the five-person committee for drafting a declaration of independence. That committee subsequently assigned him the task of producing a draft document for its consideration. Drawing on documents, such as the Virginia Declaration of Rights, state and local calls for independence, and his own draft of a Virginia constitution, Jefferson wrote a stunning statement of the colonists' right to rebel against the British government and establish their own based on the premise that all men are created equal and have the inalienable rights of life, liberty, and the pursuit of happiness.
Through the many revisions made by Jefferson, the committee, and then by Congress, Jefferson retained his prominent role in writing the defining document of the American Revolution and, indeed, of the United States. Jefferson was critical of changes to the document, particularly the removal of a long paragraph that attributed responsibility of the slave trade to British King George III. Jefferson was justly proud of his role in writing the Declaration of Independence and skillfully defended his authorship of this hallowed document.