Answer:
Explanation:
Exothermic Reactions
Exothermic Reactions
This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light. Figure: Chemical reaction: A Hermite reaction, which produces molten iron.
All rocks began as what type of rock?
planetary
igneous
metamorphic
sedimentary
Answer:
Igneous
Explanation:
What is a closed water cycle?
Answer:
The global hydrological cycle is powered by solar energy. It is a closed system, in continual circulation. This means that there is a definite amount of water in the system and that this amount does not change. 99 per cent of the water is stored within the cycle, leaving only 1 per cent in circulation.
Explanation:
which represents the copernican model that is the most similar to that of Aristarchus?
Answer: A
Explanation: A is the answer
what would she see if there had been salts dissolved in the colourless , clear liquid?
Answer:
physical change
Explanation:
it has to be 20 charchters long
The number of protons in an atom is equal to its (2 points)
оа
atomic number
atomic mass
ос
atomic model
o d
atomic medium
equal to its atomic number
Answer:
The number of protons id equal to the atomic number on the periodic table.
Explanation:
can anyone help me with my homework lol im really behind and need answers! i need help/answers with these subjects - math 2 - chemistry - spanish 2 - world history - complit 2 (english). It's fine if you can Answer only 1 subject!! i just need to catch up
Answer:
where is the question please send question I will give don't worry
When heat is lost, molecules
2.
Which of the following is good evidence that an unknown sample is a pure
substance.
A
After leaving a liquid to settle, it separates.
B
After leaving a liquid to settle, it does not separate.
С
After evaporating a liquid, there is nothing left behind.
D
After evaporating a liquid, a white powder is left behind.
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Answer:
С. After evaporating a liquid, there is nothing left behind
Explanation:
In chemistry, a pure substance is that substance that has a definite chemical composition. It cannot be separated using physical means as the chemical bonds that forms it have to be broken. Pure substances include elements and compounds.
According to this question, a good evidence that an unknown sample is a pure substance would be that: After evaporating a liquid, there is nothing left behind. This means that after using physical separation technique, THE PURE SUBSTANCE COULD NOT BE SEPARATED, hence, nothing is left behind.
Chemistry, biology and geography are the branch of natural science.
Select one:
True
False
Answer:
the answer is (a)true.
Answer (s) true.
Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.
A neutral atom has an atomic number of 20 and an alum
does the atom have?
Explanation:
Atomic number of the atom is 20 in neutral state.
The atomic number is the number of protons in the atom. Protons are positively charged particles in an atom. So, the atom has a proton number of 20 Also, for a neutral atom, the number of protons is equal number of electrons. Number of electrons in the atom is 20Australia's winter solstice starts in June 21st. What season will begin in
North America at that same time?
Answer:
summer will start in North America June 21st
NO ONE ANSWERS MY QUESTIONS
answered
Continue off my answer
Choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. Carbon Monoxide (co) is a mix of carbon and oxygen and when they mix they make carbon monoxide.
Answer:
where is the answer options because it sounds like I need some
Answer:
Sodium Hydride=NaH which has 1 sodium atom, and 1 hydrogen atom, i know this because there are no added numbers meaning theres one of each element.
Explanation:
A container with an initial volume of 1.0L is occupied by a gas at a pressure of 150kPa at 25'C. By changing the volume, the pressure of the gas increases to 600kPa as the temperature is raised to 100'C. What is the new volume? Use Combined Gas Law
Answer:
Final Volume = 0.31L
Explanation:
Initial volume V1 = 1L
Initial pressure P1 = 150kPa
Initial temperature, T1 = 25'C + 273 = 298K
Final Pressure P2 = 600kPa
Final Temperature T2 = 100'C + 273 = 373K
Final Volume V2 = ?
The combined gas law is given as;
P1V1 / T1 = V2P2 / T2
150 * 1 / 298 = V2 * 600 / 373
V2 = 55950 / 178800 = 0.31L
Radar works by sending out electromagnetic energy at a particular wavelength and receiving a reflected signal from distant objects, similar to a sound echo. Many modern military aircraft have what is known as “stealth technology” that allows the aircraft to be invisible to enemy radar. What statement best explains how this is possible?
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of options. However, stealth technology works (in two major ways) by using coating materials other than the normal coating materials or by changing the shape of the aircraft.
Normally, the coating material of the aircraft are always produced in a way that they can be able to reflect antenna signals back to radar antenna. However, with stealth technology, other coating materials have been developed that absorbs the radar energy instead of reflecting it. Also, conventional aircrafts have a rounded shape which makes the body easily reflect some radar signals back to the radar antenna but stealth aircrafts have a flat surfaces and pointed edges instead; this enables the aircraft to reflect radar signals away from the radar antenna.
Molecular mass of CH3 OH =
Answer:
32g/mol
Explanation:
When dealing with a compound, the molar mass is the gram - formula mass or gram moleclular weight. This is determined by the addition of its component atomic masses.
For CH₃OH;
Atomic mass of C = 12g/mol , H = 1g/mol, O = 16g/mol
So,
Molecular mass = 12 + 3(1) + 16 + 1 = 32g/mol
What do the valence of electrons tell you?
Answer:
valence electrons are the electrons that are located in the outermost electron shell of an element. Knowing how to find the number of valence electrons in a particular atom is an important skill for chemists because this information determines the kinds of chemical bonds that it can form and, therefore, the element's reactivity
Explanation:
4. Refine Your Plan Suppose you are mixing ingredients for bread, and
the recipe says to bake the dough as soon as it's mixed. But, you have
another task to do and are unable to bake the dough right away. Wha
should you do to make sure your bread still turns out well?
PlEASE ITS TIMED HELP
Answer:
the bread rising shows that it’s baking which is a chemical reaction
Explanation:
evaluate these two sound waves and determine what property they have In common
Answer:
The same wavelength
Explanation:
The two sound waves shown in the diagram has the same wavelength as clearly shown.
Wavelength of a wave is the distance between a complete wave cycle. It is the difference between successive train of troughs and crests. In the figure shown the amplitude, vertical displacement of the wave differs. But the wavelength of the waves are the same.Given the reaction: 4NH3 + 502 → 4NO + 6H2O
What is the total number of moles of NO produced when 1.0 mole of O2 is completely consumed?
Answer: Hello there! the answer is 3.
Explanation:
When you put it into a table and separate the variables, you'll get 0.80 molecules.
Answer:
3
Explanation:
trust
WILL GIVE LOTS OF POOIINNTTSSS PLEEAASSEE IMMM CRYINNNNNN PLEASE STOP JUST SITTIN THERE AND LOOKIN AT ITTT ANSWEERRR ASAPPPP
Explain specific heat in your OWN words. (2pts) Explain the equation. (1pt) Give an example of your understanding of the concept that we encounter on a daily basis. (3 pts.)
All the heat needed to raise the temp of something at a given degree.
Q=mc△T
Q= heat energy
m= mass
c= specific heat capacity
△T= change in temperature
Is "Hypooxide" even a thing???
Answer:
yes it is
Explanation:
Determine the total volume of a balloon if it is inflated with 2.50g helium at 180C and 0.87atm.
Answer:
V = 267.2 L
Explanation:
Given data:
Volume of balloon = ?
Mass of helium = 2.50 g
Temperature of gas = 180°C
Pressure = 0.87 atm
Solution:
Number of moles of helium:
Number of moles = mass/molar mass
Number of moles = 2.50 g/ 4 g/mol
Number of moles = 0.625 g
Volume of helium:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
0.87 atm× V = 0.625 mol × 0.0821 atm.L/mol.K×453 K
V = 232.45 atm.L /0.87 atm
V = 267.2 L
When is International Day of Forests?
Answer:
21 March
Explanation:
hope its helpful
why is group 8 not called group 8?
Answer:
Why is it called Group 8? In the rest of the periodic table, the number of the group is the same as the number of outer shell electrons in the atoms of that group. This is not true for the noble gases. Helium only has 2 electrons in its outer shell, while the others all have 8.
every element has 8 electron in outer shell but not in helium because it has 2 electrons
Write out in paragraph form your explanation to a first-grade student who is having trouble understanding the idea of freedom.
The question needs specifics so that students know what should be included in their response.
Answer:
Freedom is when everyone tells you to wear your mask, but if you dont feel like it, you choose to not wear your mask. Even though you have the choice between getting the infection or not, you can still choose to get the virus.
Explanation:
lavoviser is commonly know as the( brainly dont eveer help)
Answer:Lavoisier is known as the “Father of Modern Chemistry” or the “Father of Chemistry”.
Explanation:
Which process takes place in both plant and animal cells
A.Photosynthesis
B.Cellular respiration
C.Formation of glucose
Answer:
cellular respiration
Answer:
the answer is A. cellular respiration
What type of atom has 1 proton, 1 electron, and 1 neutron?
Answer:
Hydrogen atoms
what refers to how large ro strong is the force
Answer:
Magnitude determines the size and how strong force is.
Explain why these are the products based on trends in the periodic table (the number of
valence electrons, electronegativity, etc.) for:
CH4 + O2 ------------> CO2 + H2O
Answer:
As more potassium sulfate dissolves in the water, the mixture becomes
Explanation:
As more potassium sulfate dissolves in the water, the mixture becomes
