Answer:
carbon dioxide
helium
Explanation:
Answer:
i think it is helium
Explanation:
What happens in a chemical change that does not occur in a physical change?
Answer:
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.
Who wrote the first modern chemical textbook?
Antoine Lavoisier
Dmitri Mendeleev
Henry Moseley
Johann Dobereiner
Answer:
A. Antoine Lavoisier
Explanation:
He is know for creating the first chemical textbook. This textbook included rules for naming different chemical compounds, which is the still the same method we use to this day.
Hoped this can help! :D
Answer:
a
Explanation:
What is the mass of 1.25 x 10^24 Oxygen atoms? *
1.)32.0 g
2.)1.6 x 10^23 g
3.)O 16.0g
4.)33.2 g
Answer:
4.)33.2 g
Explanation:
(1.25E24/6.022E23)×15.99
is mechanical potential or kinetic energy
Plz help!
What is 1 item that is an element?
Give an example of how the 1 item is an element
Oxygen
Oxygen is considered an element because it cannot be broken down any farther.
What is the volume in mL of .00024 moles of mercury? The density of mercury is 13.6 g/mL.
Answer : 3.53x10⁻³ ml
Further explanationDensity : the ratio between mass and volume
Can be formulated :
[tex]\tt \boxed{\bold{\rho=\dfrac{m}{V}}}[/tex]
ρ = density, kg/m³ or g/ml
m = mass, kg or g
V = volume = m³ or ml
While mol : dividing mass with molar mass(MW=molecular weight)
[tex]\tt n=\dfrac{mass}{MW}[/tex]
n= mol
mass = grams
MW = molecular weight ,g/mol
Knownmoles : 0.00024 moles of Mercury(Hg)
MW of Hg = 200,59 g/mol
so the mass of Mercury :
[tex]\tt mass=moles\times MW\\\\mass=0.00024\times 200,59\\\\mass=0.048~g[/tex]
Because the density of Mercury is 13.6 g/mL, then the volume :
[tex]\tt V=\dfrac{mass}{density}\\\\V=\dfrac{0.048~g}{13.6~g/ml}\\\\V=\boxed{\bold{3.53\times 10^{-3}ml}}[/tex]
How many moles are in 25.3 g of a sample of potassium nitrate (KNO3)?
Answer:
25.3 g of KNO₃ contain 0.25 moles.
Explanation:
Given data:
Number of moles of KNO₃ = ?
Mass of KNO₃ = 25.3 g
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of KNO₃:
KNO₃ = 39 + 14+ 16×3
KNO₃ = 101 g/mol
Now we will put the values in formula.
Number of moles = 25.3 g/ 101 g/mol
Number of moles = 0.25 mol
Thus, 25.3 g of KNO₃ contain 0.25 moles.
which best describes matter?
Answer:
matter is anything that has mass and takes up space
Explanation:
if anyone can sole I give big brain
___. CO(g) +. ___ H2(g) ---> ___ C8H18(l) +. ___ H2O
Answer:
. 8 CO(g) + 17 H2(g) 1 C8H18(l) + 8 H2O
Explanation:
Which of the following is the ground state electron configuration of Ni?
Answer:
Nickel atoms have 28 electrons and the shell structure is 2.8. 16.2. The ground state electron configuration of ground state gaseous neutral nickel is [Ar]. 3d8.
Explanation:
If someone takes a material that looks pure, and then they do something to it that results
in two separate materials, how can they know if they originally had a pure-looking
mixture of two things that they simply separated into its parts, or if they originally had a
pure material that was a compound that was chemically broken down into new
compounds or elements?
lile
Answer:
The determination of the nature of the combination of the two separate materials in the original material that looks pure is based on the characteristic of the change process they undergo to become two separate materials.
Therefore, they can know if they initially had a mixture or a compound by the following steps;
1) If the two separated materials can be easily remixed to form the original material, then they likely have a mixture of the two separate materials
2) If the process that results in the formation of the two separate materials, involves the absorption or evolves heat or other forms of energy, then the original substance was a compound
3) If the two newly formed materials is seen to be a permanent change, then the original material was a compound
Explanation:
When a metal atom gains electrons it forms an anion.
Always true
Sometimes true
Never true
Which scenario BEST describes how an atom produces light?
electron loses energy as it transitions to lower energy level
electron gains energy as it transitions to lower energy level
electron gains energy as it transitions to a higher energy level.
electron loses energy as it transitions to higher energy level
Answer:
electron loses energy as it transitions to lower energy level
Explanation:
An atom is capable of absorbing and releasing electrons. The atom of a substance is said to be at its GROUND LEVEL STATE when it contains the lowest energy level. However, when it absorbs or takes in energy, it moves to a high energy level called EXCITED STATE. This level is unstable and hence, subject to declination.
Due to the instability of the excited state of an atom, it tends to lose the absorbed electrons and in the process of doing so, it emits or produce light. Therefore, according to this question, light is produced by an atom when the electron loses energy as it transitions to lower energy level i.e excited state to ground level state.
why do covalent bonds melt faster and have low melting points than ionic bonds?
Answer:
Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
Explanation:
Given the mass number and atomic number, how do you determine the number of neutrons?
Answer:
You subtract the given atomic mass by the atomic number
Explanation:
The answer is the explanation
what skill is a scientist using when she listens to the sound that whales make
Answer:
Making observations
Explanation:
WILL GIVE BRAINLIEST! URGENT!
In the vinegar and salt solution, is it possible there was some other compound that formed on the egg shell instead of the food coloring? Based on what you know about the charge on the egg shell and the ions in the solution, what might have reacted to form a compound on the shell instead of the food coloring?
Answer: Vinegar
Explanation:
The vinegar and salt affects the shell because food coloring does not affect anything besides the color so the viniger has substances which dissolves thing and the salt just made the vinegar a stronger substance. The Vinegar reactes to form a compund on the shell.
Explain what is Thermal Energy
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process
Explanation:
thermal energy Is just heat
is a nuclear reactor an example of fusion or fission?
Answer:
fission
Explanation:
Plz help!
How is oxygen an element? Explain.
The energy required to remove an electron from the outermost shell is called
Answer:
Ionization energy
Explanation:
Ionization energy can be defined as the energy needed to remove an electron from the outermost she'll.
-2(-x-3) - 4x-1=13
gig
Answer:
that means a train railroad track dude
do you mean -2(-x--3) - 4x-1=13 without the gig
Explanation:
what is the lewis structure for RnF2
Answer:
E3 ubiquitin-protein ligase RING2 is an enzyme that in humans is encoded by the RNF2 gene.
Explanation:
Lewis structure of Radon difluoride has three lone pairs and two bonding pairs.
What is Lewis structure?Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule, as well as any lone pairs of electrons that may be present. It's used to depict how electrons in a molecule are distributed around specific atoms. Electrons are shown as "dots" or as a line between two atoms when they are bonded.
Hence, Lewis structure of Radon difluoride is
To know more about Lewis structure, here,
https://brainly.com/question/20300458
#SPJ2
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What is the charge on an electrically neutral atom of hydrogen?
+1
+2
0
−1
Answer:
+1
Explanation:
same amount of electrons as protons
If an element has an atomic number of 8 and an atomic mass number of 18, would it be an isotope? Why or why not?
Answer:
It would be an isotope.
Background Information:
Isotopes are typically elements that have a different number of protons than neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.
Explanation:
If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then we can simply take away the amount of protons from that number, 18 - 8 = 10. If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons we know that this particular atom is an isotope.
It would be an isotope.
IsotopeIsotopes are elements that have the same number of electrons and protons but different numbers of neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.
If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then protons
18 - 8 = 10
If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons. So, the particular atom is an isotope.
Find more information about isotope here,
https://brainly.com/question/13214440
Calculate the mass in grams of 8.24 x 1024 molecules of CO2
Answer:
Explanation:
1 mole of any gas contains 6.02 x 10²³ molecules of gas
6.02 x 10²³ molecules of CO₂ contains 1 mole of CO₂
8.24 x 10²⁴ molecules of CO₂ will contain 8.24 x 10²⁴/ 6.02 x 10²³ moles at STP
13.6877 moles
mol weight of CO₂ = 44 g
13.6877 moles of CO₂ = 44 g x 13.6877 g = 602.25 gm.
Parts working together for one purpose
Answer:
A system is a collection of parts that interact together for a common purpose. But a system is not just any old collection of parts. No single part can do the job alone, and any malfunction or delay is likely to affect the whole system. A body system is a set of body parts that do a particular task.
Explanation:
A 25.3-8 sample of an unknown compound contains
0.8 g of oxygen. What is the percent by mass of
oxygen in the compound?
The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%
From the question given above, the following data were obtained:
Mass of compound = 25.3 g
Mass of oxygen = 0.8 g
Percentage of oxygen =?The percentage of oxygen in the compound can be obtained as follow:
[tex]Percentage = \frac{mass of element}{mass of compound } *100[/tex]
Percentage of oxygen = [tex]\frac{0.8}{25.3} * 100[/tex]
Percentage of oxygen = 3.16%Thus, the percentage of oxygen in the compound is 3.16%
Learn more: https://brainly.com/question/17528267
What’s the compound name for V2(S2O3)3
Answer: I HOPE THIS HELPS, HAVE A GREAT EARLY HALLOWEEN
Explanation:
PubChem CID: 1084
Molecular Formula: S2O3(2−) or O3S2-2
Synonyms: Thiosulphate THIOSULFATE ION sulfurothioate UNII-LLT6XV39PY Thiosulfate (S2O32-) More...
Molecular Weight: 112.13 g/mol
List 4 properties of ironically boned compound
Answer:
do u mean ironically? if so here are some:
they're hard and very brittle!!
good insulators
contain high melting points
the form crystals