Have you ever seen a building that looks as if it were made out of mirrors? These buildings are made using reflective glass. How would
replacing clear windows with reflective glass affect the temperature inside the building? Explain your ideas.
Answer:
the sun would reflect off of the windows causing less heat to travel into the building
Explanation:
Write word equation for the chemical reaction that occurs when solid sodium oxide is added to water at room temperature and forms sodium hydroxide (dissolved in the water).
Answer:
[tex]$Na_2O + H_2O \rightarrow 2NaOH$[/tex]
Explanation:
When solid sodium oxide reacts with water in a room temperature, it forms sodium hydroxide.
The one word equation of the reaction will show or represent the reactants on the left hand side of the arrow and the products on the reaction on the right hand side of the reactants.
Thus the equation of the reaction is :
[tex]$Na_2O(s) + H_2O(l) \rightarrow 2NaOH(aq)$[/tex]
Sodium oxide + water ----[tex]$\rightarrow$[/tex] sodium hydroxide.
The equation for the chemical reaction should be [tex]Na_2O + H_2O \rightarrow 2NaOh[/tex]
Chemical reaction equation:At the time when the solid sodium oxide reacted with the water in room temperature so it created the sodium hydroxide.
Here the one-word equation represents that the reactant should be on the left-hand side while on the other hand, the product should be on the right-hand side.
Also, it should be like
Sodium oxide + water ---- sodium hydroxide.
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Please help me the picture is above.
Answer:
A
Explanation:
bc inorganic compoud refers to all compound that do not contain carbons.
true or false: Fungi are able to carry out photosynthesis, similar to plants
Answer:
false
Explanation:
Answer:
FALSE ...
Explanation:
However, unlike plants, fungi do not contain the green pigment chlorophyll and therefore are incapable of photosynthesis. That is, they cannot generate their own food — carbohydrates — by using energy from light. This makes them more like animals in terms of their food habits
Can someone please help me, I’m taking a test
Answer:
Im pretty sure its none of these
SA
Element Proton number Nucleon number
Х
13
27
Y
8
16
Table 2
Jacheal 2
Element X reacts with element Y to form
compound
What is the molar mass of the compound?
A 43 g mol
C 102 g mol
B 50 g mol
D 113 g mol
SA
31
Answer:
маликулярная масса ровна 23
Use what you know about endothermic and exothermic reactions to explain the differences in the graphs above
Answer:
yes I do
But I can't see the question very well
Explanation:
25.0cm3 of s saturated potassium hydroxide is neutralized by 35.0cm3 of hydrogen chloride acid of concentration 0.75 mol/dm3. Calculate the concentration of potassium hydroxide solution. Please help, will give brainliest, unhelpful answers will get reported.
Answer:
Concentration of the original [tex]\rm KOH[/tex] solution: approximately [tex]1.05\; \rm mol \cdot dm^{-3}[/tex].
Explanation:
Notice that the concentration of the [tex]\rm HCl[/tex] solution is in the unit [tex]\rm mol\cdot dm^{-3}[/tex]. However, the unit of the two volumes is [tex]\rm cm^{3}[/tex]. Convert the unit of the two volumes to [tex]\rm dm^{3}[/tex] to match the unit of concentration.
[tex]\begin{aligned} V(\mathrm{NaOH}) &= 25.0\; \rm cm^{3} \\ &= 25.0\; \rm cm^{3} \times \frac{1\; \rm dm^{3}}{1000\; \rm cm^{3}} \approx 0.0250\; \rm dm^{3} \end{aligned}[/tex].
[tex]\begin{aligned} V(\mathrm{HCl}) &= 35.0\; \rm cm^{3} \\ &= 35.0\; \rm cm^{3} \times \frac{1\; \rm dm^{3}}{1000\; \rm cm^{3}} \approx 0.0350\; \rm dm^{3} \end{aligned}[/tex].
Calculate the number of moles of [tex]\rm HCl[/tex] molecules in that [tex]0.0350\; \rm dm^{3}[/tex] of [tex]0.75\; \rm mol \cdot dm^{3}[/tex] [tex]\rm HCl\![/tex] solution:
[tex]\begin{aligned}n(\mathrm{HCl}) &= c(\mathrm{HCl}) \cdot V(\mathrm{HCl}) \\ &= 0.00350\; \rm dm^{3} \times 0.75\; \rm mol \cdot dm^{3} \\ &\approx 0.02625\; \rm mol\end{aligned}[/tex].
[tex]\rm HCl[/tex] is a monoprotic acid. In other words, each [tex]\rm HCl\![/tex] would release up to one proton [tex]\rm H^{+}[/tex].
On the other hand, [tex]\rm KOH[/tex] is a monoprotic base. Each [tex]\rm KOH\![/tex] formula unit would react with up to one [tex]\rm H^{+}[/tex].
Hence, [tex]\rm HCl[/tex] molecules and [tex]\rm KOH\![/tex] formula units would react at a one-to-one ratio.
[tex]{\rm HCl}\, (aq) + {\rm NaOH}\, (aq) \to {\rm NaCl}\, (aq) + {\rm H_2O}\, (l)[/tex].
Therefore, that [tex]0.02625\; \rm mol[/tex] of [tex]\rm HCl[/tex] molecules would neutralize exactly the same number of [tex]\rm NaOH[/tex] formula units. That is: [tex]n(\mathrm{NaOH}) = 0.02625\; \rm mol[/tex].
Calculate the concentration of a [tex]\rm NaOH[/tex] solution where [tex]V(\mathrm{NaOH}) = 0.0250\; \rm dm^{3}[/tex] and [tex]n(\mathrm{NaOH}) = 0.02625\; \rm mol[/tex]:
[tex]\begin{aligned}c(\mathrm{NaOH}) &= \frac{n(\mathrm{NaOH})}{V(\mathrm{NaOH})} \\ &= \frac{0.02625\; \rm mol}{0.0250\; \rm dm^{3}}\approx 1.05\; \rm mol \cdot dm^{-3}\end{aligned}[/tex].
A radio station transmits to a receiving antenna. The radio wave sent is a
a.
surface wave
b.
torsional wave
c.
longitudinal wave
d.
transverse wave
longitudinal
all sound waves are longitudinal
PLS PLS PLS HELP PLS I REALLY NEED IT AND I WILL MARK YOU BRAINLYEST:((
PLSSSS
Answer:
D and A
Explanation:
D is a Mitochondria (the powerhouse of the cell)
A is a Choroplast (the part that takes in the sun)
What element is this atom?
(Urgent plz help)
Which of the following increases the concentration of OH- ions?
A: Acid
B: Base
C: Water
D: Salt
Answer:
Basee is the answer hope its write xd
Answer:
B: Base
Explanation:
An acid will increase the concentration of hydrogen (H+) ions in a solution, and a base would increase the concentration of hydroxide (OH–) ions in a solution. So, Base is the answer. :)
which of these substances will conduct electricity? CuSO4(s) CuSO4(aq) C5H12(l) CO2(g)
Answer:
CuSO4(aq)
Explanation:
The aqueous for of CuSO₄ is an electrolyte and it will conduct electricity.
CuSO₄ is an ionic substance and in solid state, it will not have the ability to conduct electricity.
In aqueous form, it will contain free mobile ions which serves as carriers of electric current. In the solid state, the ions are arranged into a crystal lattice and will not conduct a current of electricity. The remaining given compounds will not conduct electricity as they are non-polar and do not have free mobile electrons.7)
Mg(s) + 2 HCl(aq) + MgCl2(aq) + H2(g)
What type of reaction is shown above?
A)
decomposition
B)
double replacement
C)
synthesis
D)
single replacement
Answer:
D) single replacement
Explanation:
Given reaction:
Mg + 2HCl → MgCl₂ + H₂
The reaction shown above is a single displacement reaction.
In a single displacement reaction, a more reactive atom displaces another from a given compound.
The comparison here is between Mg and H.
On the activity series, Mg is higher and more reactive, it will displace H from the solution of HCl. This
This reaction type is called a single replacement reaction.
In a polar covalent bond, the more electronegative atom pulls electrons closer and gains a slightly _______ charge, while the less electronegative atom has a slightly _________ charge.
Answer:
In a polar covalent bond, the more electronegative atom pulls electrons closer and gains a slightly negative charge, while the less electronegative atom has a slightly positive charge.
Explanation:
The covalent bond is the chemical bond between two atoms where electrons are shared. This makes the atoms behave as a unit, which we call a molecule. Atoms interact with each other through the outermost electrons forming bonds.
In other words, the covalent bond is formed by sharing a pair of electrons between the two atoms, one coming from each atom. The shared pair of electrons is common to the two atoms and holds them together. So molecules are formed: small groups of atoms linked together by covalent bonds.
In covalent bonds a dipole forms. The atom with the highest electronegativity attracts electrons towards itself, forming a negative dipole around it since the electrons have a negative charge. In the atom with lower electronegativity, the dipole formed is positively charged, since it partially gives up its electrons.
This is, in a polar covalent bond, the more electronegative atom pulls electrons closer and gains a slightly negative charge, while the less electronegative atom has a slightly positive charge.
Answer fast please What system are your lungs part of
A. Circulatory
B, Respiratory
C. Digestive
D. Skeletal
Answer:
B. Respiratory System
Answer:
B, Respiratory
Explanation:
which one of these elements is the lightest: 1- oxygen , 2- carbon , 3- nitrogen , 4- neon.
idk what neon is but that’s an answer so...
Think about how particles are arranged inside atoms. Please name and describe those three particles, and describe how the particles are arranged inside atoms. Some topics to include are: the charge of the particles, the mass of the particles, and where the particles are located.
Help please When you are measuring your pulse (heart beats per minute) what system are you monitoring?
A. Digestive
B. Respiratory
C. Circulatory
D. Integumentary (skin)
Which is an alkaline earth metal?
Answer:
actually there are 6 of them
Explanation:
heres the list:
They are beryllium, magnesium, calcium, strontium, barium, and radium.
hope it helpssss :)
Answer/Explanation:
Alkaline earth metals are similar to Alkali Metals, but they tend to to be harder, denser, and less reactive. However it is too reactive to be found in nature. It is commonly found in batteries, fireworks, flashlights, and cameras. It has Valence Electrons of 2 and the elements in this category are:
Beryllium BeMagnesium MgCalcium CaStrontium SrBarium BaRadium Ra
When a surface is experiencing friction with another surface, how are the particles
affected? How will the temperature of the surface change?
Prediction
Answer:
the surface may become etheir scratchy and soft and that the surface may also be come heated up due to friction
When a surface is experiencing friction with another surface, the surface may become either scratchy and soft and that the surface may also be come heated up due to friction.
When a surface is experiencing friction ?When a surface is experiencing friction with another surface, the surface may become either scratchy and soft and that the surface may also be come heated up due to friction.
Projectile motion is a type of motion in which a object is thrown from the surface earth at some angle it will take projectile projection .
In above question a man thrown a object 14 m/sec an it will moves 2 meter.
Then
vsinθ×t−1/2×gt^2=25
where v = initial velocity in m/sec
t = time in sec
g = acceleration due to gravity
14sinθ×1−5×12=25
14sin=30
sin=30/14
sinθ>2 not possible
vsinθt−1/2×gt^2=2
14×sinθ−5=2
14xsinθ=7
Sinθ=7/14
Sinθ=1/2
θ=30 degree
Therefore, When a surface is experiencing friction with another surface, the surface may become either scratchy and soft and that the surface may also be come heated up due to friction.
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Please help❤️
Explain what is meant by noble gas envy.
Answer:
a phrase that describes how elements what do be stable and non reactive like the noble gas elements are.
Using the model of the periodic table, which element pictured represents an unreactive gas?
Answer:
2
Explanation:
Nobel gasses are not reactive and are the far right group on the periodic table. This is because they have a full valence electron shell which is the most stable electron configuration. Most reactions occur in order for an atom to fill its valence shell and since they already have a full valence shell there is no reason for them to react.
This particle has mass but no charge.
Answer:
Neutrons
Explanation:
let me know if it is right or not:)
How many molecules of nitrogen dioxide gas (NO2) are present in 15 liters of the gas at STP?
Answer:
4.031×[tex]10^{23}[/tex]
Explanation:
You first need to calculate the number moles of NO2. To do this use PV=nRT
STP stands for standard temperature and pressure which is 0 degrees C and 1 atm.
due to that:
P = 1 atm
V = 15 L
R = 0.08206 L*atm/mol*K
T = 273 K
n = unknown moles
solve for n to make the equation n=PV/RT
n=(1atm*15L)/(0.08206 Latm/molK*273K)
n=0.6696 mol of NO2
Then to find the number of molecules we use Avogadro's number which tells us the number of molecules per mol of a molecule or atom.
Avogadro's number is 6.02x10^23 molecules/mol
number of molecules = 0.6696mol × 6.02x10^23 molecules/mol
number of molecules = 4.031×10^23 molecules of NO2
Let me know if anything is not clear or if you get something else in the comments so that we can work it out.
Identify the type of reaction: 2AgCl + BaBr2 -> 2AgBr + BaCl2
A) decomposition
B) combustion
C) double replacement
D) single replacement
Answer:
C
Explanation:
Just look at the reactants.
2AgCl + BaBr2
The first reactant is made of 2 elements.
The second reactant is made of 2 elements.
It can't be a decomposition. At this level there is only one reactant made of 2 elements. Something like
2MgO ===> 2Mg + O2
is a decomposition. One compound breaking down into 2 elements Mg and O.
It can't be a combustion. One of the reactants in a combustion is oxygen. Those equations look like
C3H8 + 5O2 ==> 3CO2 + 4H2O
That would be what a combustion looks like
It can't be a single replacement. They look like
Mg + CuO ===> Cu + MgO
There are elements on both sides of the reaction.
that leaves a double replacement which I wrote about how you distinguish it.
Answer:
c
Explanation:
What is the difference between energy levels, sub levels, and orbitals?
Explanation:
Orbitals are spaces that have a high probability of containing an electron. ... The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max.
Answer:
There are different energy levels in atoms. There are also different orbitals: there is 1s orbital, 3p orbitals, 5d orbitals and 7f orbitals. Not sure about sub levels...
Explanation:
true or false, when a material loses thermal energy, it usually contracts.
Answer:
True
Explanation:
Whenever something loses thermal energy, it contracts and becomes smaller.
Answer: it might be true
Explanation:
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail
(a) creates a friction with the hammer.
(b) disappears into the wood.
(c) exerts an equal force back on the hammer.
(d) moves at a constant speed.
Answer:
C
Explanation:
When a hammer strikes and exerts force on a nail, the nail exerts an equal force back on the hammer. Option C. This is further explained below.
What is Newton’s third law of motion?Generally, According to Newton's third law, when two bodies contact, they apply forces to each other that are equal in magnitude and opposing in direction.
In conclusion, Newton’s third law of motion certifies that the nail exerts an equal force back on the hammer.
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What is the formula of iron(iii) oxide?
Answer:
Fe2O3
Explanation:
Answer:
Fe2O3
This is the chemical formula for iron(iii) oxide.