Answer:
D. 1 C, 4 O and 4 H
Explanation:
a p e x, just took the quiz
According to law of conservation of mass, the set of atoms that must make up the equation's reactants is 1 C, 4 O and 4 H.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
Learn more about law of conservation of mass,here:
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1. Which of the following is not a major classification for elements in the periodic table?
O a. metals
O b. metalloids
O c. nonmetals
O d. noble gases
Answer:
Noble gases
Explanation:
(?)Li2O + (?)H2O → (?)LiOH
Answer:
Li2O+H2O---->(2)LiOH
Explanation:
you have to balance the equation and not all the blanks have to be filled all the time but if it makes it easier for you in the first 2 question marks you can put a 1 which isnt necessary but if ur a visual person it will help.
hope this helps im litterally learning the same thing as u lol
Answer:
1,1,2
Explanation:
this was correct for me, if it wasnt correct check if youre on the right question
Which option is an example of a chemical property?
boiling point
density
color
ability to react with oxygen
Answer:
Boiling point is one of the answers
What human activity has caused the Increase of CO2 in the atmosphere?
why organic compounds have a slow rate of reaction
Answer:
first help me plz plz
Explanation:
coz i hate chemistry
5. Name the compound which contain Strontium, Fluorine, and Oxygen.
Options:
Strontium fluorate
Strontium fluoride
Strontium chlorate
Strontium fluorine
how to determine whether a liquid is pure water or not besides boiling the liquid?
Answer:
Explanation:
Aside the boiling point of water, another colligative property that can be used to identify pure water (or not) is the freezing point. Water freezes at 0 °C, but with the presence of impurities, there is a freezing point depression of the water. Thus, if the water is not pure, the liquid could freeze at a temperature lower than 0 °C (with a negative sign like -8 °C).
How many neutrons are in the nucleus of an atom with a mass number of 80 and an atomic number of 35?
Answer: 45
Explanation:
mass number = number of protons and neutrons
atomic number = number of protons
to find neutrons subtract atomic number from mass number
so 80 - 35 = 45 neutrons
How many hydrogen atoms are there in the molecule H2SO?
A. 1
B. 3
C. 4
D.2
please help, brainliest to the first person who is correct , i’ll give another 25 points if this is right
Answer:
D:2
Explanation:
H is hydrogen, and the subscript represents the amount of atoms it has so H2SO is two hydrogens
Answer:
D. 2 I think, not 100% sure.
The total amount of matter of all of the organisms in an ecosystem is referred to as
a. Rub the magnet along the nail or knitting needle. Now try picking up the paper clip or tack. Could your nail pick it up? How many can it pick up at once?
b. Now try to make your magnet stronger by rubbing the magnet along the nail or knitting needle for a longer time. Rub only in one direction, not back and forth. This will increase the number of atoms that line up with the magnet. Try to pick up paper clips or thumbtacks. How many can it pick up now?
Answer:
ight i'll answer both rq
Explanation:
a. Rub the magnet along the nail or knitting needle. Now try picking up the paper clip or
tack. Could your nail pick it up? How many can it pick up at once?
after rubbing the magnet with the nail, it could pick up 7 small paper clips.
b. Now try to make your magnet stronger by rubbing the magnet along the nail or knitting
needle for a longer time. Rub only in one direction, not back and forth. This will increase
the number of atoms that line up with the magnet. Try to pick up paper clips or
thumbtacks. How many can it pick up now?
after rubbing it a second time but for a longer period, it could pick up around 10, almost lifting the 11th.
Answer:
A. After rubbing the magnet with the nail, it could pick up 7 small paper clips.
B. After rubbing it a second time but for a longer period, it could pick up around 10 small paper clips, almost lifting the 11th one.
please answer willl give brainlist !!! Name the noble gases. What are the common properties between them?
Answer: Other characteristics of the noble gases are that they all conduct electricity, fluoresce, are odorless and colorless, and are used in many conditions when a stable element is needed to maintain a safe and constant environment. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
Which formula equation shows a reversible reaction? 2 Upper N a + Upper F Subscript 2 Baseline right arrow 2 Upper N a Upper F. Upper C a Upper C Upper O Subscript 3 Baseline right arrow Upper C a Upper O + Upper C Upper O Subscript 2. Upper N Upper H Subscript 4 Baseline Upper C l (s) double-pointed arrow Upper N Upper H Subscript 3 Baseline (g) + Upper H Upper C l (g). 2 Upper H Subscript 2 Baseline Upper O Subscript 2 Baseline (a q) right arrow with n above it 2 Upper H Subscript 2 Baseline Upper O (l) + Upper O Subscript 2 Baseline (g).
Answer:
NH₄Cl ⇄ NH₃ + HCl
Explanation:
The formula equation shows a reversible reaction is:
NH₄Cl(s) ⇄ NH₃(g) + HCl(g)
Classification of reactions according to their reversibilityReversible reactions: They occur in both senses, as denoted by a double arrow.Irreversible reactions: They occur in one sense, as denoted by a single arrow.Let's consider which formula equation shows a reversible reaction.
2 Na + F₂ ⇒ 2 NaFThe single arrow indicates that this is an irreversible reaction.
CaCO₃ ⇒ CaO + CO₂The single arrow indicates that this is an irreversible reaction.
NH₄Cl(s) ⇄ NH₃(g) + HCl(g)The double arrow indicates that this is a reversible reaction.
2 H₂O₂(aq) ⇒ 2 H₂O(l) + O₂(g)The single arrow indicates that this is an irreversible reaction.
The formula equation shows a reversible reaction is:
NH₄Cl(s) ⇄ NH₃(g) + HCl(g)
Learn more about reversible reactions here: https://brainly.com/question/11114490
Consider the reaction.
Upper H subscript 2 upper o (g) plus upper C l subscript 2 upper O (g) double-headed arrow 2 upper H upper C l upper O (g).
At equilibrium, the concentrations of the different species are as follows.
[H2O] = 0.077 M
[Cl2O] = 0.077 M
[HClO] = 0.023 M
What is the equilibrium constant for the reaction at this temperature?
0.089
0.26
3.9
11
Answer:
The value of Equilibrium constant for the given reaction is 0.089
Explanation:
The given data shows the following reaction
H2O (g) + Cl2O (g) ⇄ 2 HClO (g)
The above reaction is in equilibrium.
Equilibrium constant K = [tex]\frac{[C]^c*[D]^d}{[A]^a*[B]^b}[/tex]
for the reaction
aA+bB ⇆ cC +dD
so
K = [tex]\frac{[HClO]^2}{[H2O][Cl2O]}[/tex]
= [tex]\frac{[0.023]^2}{[0.077][0.077]}[/tex] = 23*23/77*77 = 0.089
Therefore the value of Equilibrium constant for the given reaction is 0.089
Answer:
The value of Equilibrium constant for the given reaction is 0.089
Down a group, the electron shielding tends to________
a.)increase
b.)decrease
thank uuu :)
Answer:
A
Explanation The number of energy levels (n) increases, and so does the distance between the nucleus and the outermost orbital. The increased distance and the increased shielding weaken the nuclear attraction, and so an atom can't attract electrons as strongly.
If the solid, liquid, and gas forms of a substance
are made up of the same type of particles, How
could a substance change from one state to
another?
presence of heat can change solid tu liquid
and liquid to gas
A scientist built a computational model to investigate what happens when magma comes into contact with the ground surface. In the model, the ground surface was 293K, whereas the magma was 1,500K. The model examined different depths of the magma away from Earth's surface and toward the core. Over a greater amount of time, more magma cooled. What form of heat transfer accounts for the magma cooling?
Answer:
Conductive heat transfer is most likely responsible for the cooling of the magma
Explanation:
The Earth's core is continuously cooling due to human's digging, allowing for more space and heat escape from the Earth's core. All magma closer to the core would have its heat absorbed by the core, hereby increasing its coolness.
This heat transfer process is common to conduction.
I hope this was helpful.
Tigers and crocodiles are more closely related than tigers and sharks. Which statement about shared characteristics best supports this statement?
Answer: Crocodiles and tigers both have four legs
Explanation: Even when sharks and tigers are both meat eaters, the question is about similarities between tigers and crocodiles, so D is out. A is about crocodiles and sharks, so it's out also. B suits for sharks too, so it's out too. C is the most suitable answer, because both animals have four legs, which means that they belong to the group of quadrupede animals.
Answer:
Crocodiles and tigers both have four legs
Explanation:
HELP!! PLEASE 10+ points!
Can you tell from the masses of the reactants which one of the reactants will be the limiting reactant? Defend your answer (use an equation within your defense).
Answer:
Explanation:
so, limiting reactants are the reactant which limit the continuing of the reaction or in simple word they are the element that run out first and are totally consumed
equation :
2koh+h2so4⇒ k2so4 +2h2o
if we have 4 mol of h2so4 and 3 mol of 2koh
number of produced moles of k2so4 on consuming all :
h2so4 ⇒ k2so4
1 mol 1 mol
4 mol ?mol
no of mol of k2so4 if all h2so4 is consumed 4 mol
2koh⇒ k2so4
2 mol 1 mol
3 mol ?mol
no of mol of k2so4 if we consume all koh = 1.5 mol
since the koh produces less mol on consuming it all
the koh is the limiting reactant
Help please. ASAP.
1. Explain how you think changing in the thickness or length of the nail will affect the strength of the electromagnet
Answer:
I believe- If there is more metal for the magnet to reach for, then the strength will grow but it may be harder to pick up off of a surface depending on the weight of the nail. If it is a light nail, it would be more efficient for a quick result in having the magnet to pick it up
Explanation:
Answer:
Ferromagnetic materials make the magnet stronger than non-ferromagnetic materials like paper, wood, or air. A wider nail will make the magnet stronger. Making the nail longer will not make the magnet stronger, unless you also add more turns to the coil.
Explanation:
I hope this helps!!
some safety precautions people should take when using fireworks
Answer:
Do not try to re-light or handle malfunctioning fireworks. Soak both spent and unused fireworks in water for a few hours before discarding.
what should the charge be for calcium and fluoride ions?
What is the order of decreasing reactivity of these 4 metals?
Answer:
Ca, Mg, Zn, Cu
Explanation:
Refer to the Reactivity Series where each metal is more reactive than others.
Which alignment of the Sun, Moon, and Earth causes a lunar eclipse?
A.
B.
C.
D.
Answer:
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly with the Earth in the middle. Hence, a lunar eclipse can only occur the full moon phase
Explanation:
please mark me brainlist
Answer:
A sun
Explanation:
because sun has heat and gives light
heyy pls help anyone?
Answer:
i agree
Explanation:
Aqueous solutions of sodium carbonate and magnesium chlorate are mixed, what is the precipitate, chemical equation, complete ionic equation, and net ionic equation
Answer:
Explanation:
Na₂CO₃ (aq)+ MgCl₂ (aq) = MgCO₃(s) +2NaCl (aq)
MgCO₃(s) is the precipitate .
Ionic equation
2 Na⁺¹ + CO₃⁻² + Mg⁺² + 2 Cl⁻¹ = MgCO₃(s) +2 Na⁺ + 2 Cl⁻
net ionic equation
Mg⁺² + CO₃⁻² = MgCO₃ (s) .
The precipitate formed in the reaction has been the magnesium carbonate salt. The net ionic equation will be: [tex]\rm Mg^2^+\;+\;CO_3^2^-\;\rightarrow\;MgCO_3[/tex].
The mixture of sodium carbonate and magnesium chlorate has been given as:
[tex]\rm Na_2CO_3\;+\;MgCl_2\;\rightarrow\;MgCO_3\;+\;NaCl[/tex]
The precipitate formed in the reaction has been the magnesium carbonate salt. The chemical equation has been written as the equation with the states of the reactants and the products.[tex]\rm Na_2CO_3\;(aq)\;+\;MgCl_2\;(aq)\;\rightarrow\;MgCO_3\;(s)\;+\;2\;NaCl\;(aq)[/tex]
The ionic equation for the reaction has been:[tex]\rm Na_2CO_3\;\rightarrow\;2\;Na^+\;+\;CO_3^2^-[/tex]
[tex]\rm MgCl_2\;\rightarrow\;Mg^2^+\;+\;2\;Cl^-[/tex]
[tex]\rm MgCO_3\;\rightarrow\;Mg^2^+\;+\;CO_3^2^-[/tex]
[tex]\rm NaCl\;\rightarrow\;Na^+\;+\;Cl^-[/tex]
The ionic equation for the reaction will be:
[tex]\rm 2\;Na^+\;+\;CO_3^2^-\;+\;Mg^2^+\;+\;2\;Cl^-\;\rightarrow\;MgCO_3\;+\;2\;Na^+\;+\;2\;Cl^-[/tex]
The net ionic equation has been consisted of the products that have been different on both the product and the reactant side. The same ions are eliminated in the net ionic equation. The net ionic equation will be:[tex]\rm Mg^2^+\;+\;CO_3^2^-\;\rightarrow\;MgCO_3[/tex]
For more information about the net ionic equation, refer to the link:
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Explain how a sedimentary rock can turn into a metamorphic rock.
Answer:
When Sedimentary rocks are buried deep beneath the Earth's surface, great pressure and tremendous heat change these rocks into new rocks containing different minerals. These are Metamorphic rocks.
Explanation:
Which is the IUPAC name for NO?
Answer:
Nitrogen (ii) oxide
Explanation:
To know the IUPAC name for NO, we shall determine the oxidation number of N in NO.
NOTE: The oxidation number of oxygen (O) is always – 2.
Thus the oxidation number of N in NO can be obtained as follow:
N + O = 0 (ground state)
N + (– 2) = 0
N – 2 = 0
Collect like terms
N = 0 + 2
N = +2
Thus, the oxidation number of Nitrogen (N) in NO is +2.
Therefore, the IUPAC name for NO is Nitrogen (ii) oxide
Answer:
nitrogen monoxide
Explanation:
for those taking quiz on edge
Based on the given information, which of the following is the students' correct conclusion about their experiment?
Answer:kj
Explanation:nnn
How many moles of oxygen gas could be produced by 120 moles of lead (II) nitrate?
Answer:
9 moles of O²
Explanation:
Hope this helped,
Philip
Brainliest always appreciated! <3
A train station in Tokyo uses tiles that convert people’s footsteps into electricity.
A.Restore
B. Rethink
C. Reduce
D. reuse
Answer:
reuse
Explanation: