Answer:
True
Explanation:
Solid molecules don't move.
Molecule of a solid are tightly packed there is no space between them so there is no movement of the molecule.
The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.
true
During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O).
Which of the following are reactants in the chemical reaction described above?
A.
hydrochloric acid and water
B.
sodium hydroxide and hydrochloric acid
C.
sodium hydroxide and sodium chloride
D.
sodium chloride and water
B. Sodium hydroxide and Hydrochloric acid
Further explanationChemical equations can be expressed in terms of
word reaction formula reactionIn a chemical reaction, there are several components, including reactants, products, and compounds that react in the form of solids, gases, and liquids
Reactants are compounds that react and form products
The reactants are generally to the left of the chemical equation and the products are to the right of the reaction
The statement of the word reaction above can be expressed by the reaction formula
[tex]\tt NaOH+HCl\rightarrow NaCl+H_2O[/tex]
This reaction is called a neutralization reaction because it involves acids(HCl) and bases(NaOH) and produces salt(NaCl)and water(H₂O)
From the reaction above, the reactants on the left are NaOH and HCl compounds
which part of the mushroom gathers nutrients from the soil or dead material that the mushroom is decomposing?
Answer:
The Mycelium is usually hidden in the soil, in wood, or another food source. A Mycelium may fill a single ant or cover many acres.
1
Aluminum metal and oxygen gas combine to produce aluminum oxide.
Which of these is the balanced equation for this reaction? *
Answer:
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Explanation:
Let's consider the unbalanced molecular equation when aluminum metal and oxygen gas combine to produce aluminum oxide. This is a combination reaction.
Al(s) + O₂(g) ⇒ Al₂O₃(s)
We can balance O atoms by multiplying O₂ by 3 and Al₂O₃ by 2.
Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Finally, we multiply Al by 4 to get the balanced equation.
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
A sample of nitrogen gas is in a 65.0-L automobile air bag and has a pressure of 745 mm Hg. What is the pressure of this sample of gas at the same temperature if it is placed into a 25.0-L bag
Answer:
the pressure = 1937mmhg using standered unit of volume
if an endothermic reaction begins at 26°C and decreases by 2°C per minute how long will it take to reach 0°C?
Answer:
13 minutes
Explanation:
For the endothermic reaction to reach 0°C, it will take 13 minutes.
Let us follow the process step by step;
Rate of decrease is 2°C per minute.
Start is 26°C
Time temperature
0 min 26°C
1 min 24°C
2 min 22°C
3 min 20°C
4 min 18°C
5 min 16°C
6 min 14°C
7 min 12°C
8 min 10°C
9 min 8°C
10 min 6°C
11 min 4°C
12 min 2°C
13 min 0°C
List two different reasons ants work together
The value of ΔH° for the reaction below is -126 kJ. __________ kj are released when 2.00 mol of NaOH is formed in the reaction?
2 Na2O2 (s) + 2 H2O (l) → 4NaOH (s) + O2 (g)
A) 252
B) 63
C) 3.9
D) 7.8
E) -126
"63" kj are released. A further solution is provided below.
The equation is:
[tex]2 Na_2O_2 (s) + 2 H_2O (l) \rightarrow 4NaOH (s) + O_2 (g)[/tex]Value of ΔH,
-126 kJAs we know,
4 moles of NaOH - (-126) kJ 2 moles of NaOH - XNow,
→ [tex]4\times X=-126\times 2[/tex]
→ [tex]4X = -252[/tex]
→ [tex]X = -\frac{252}{4}[/tex]
→ [tex]= -63[/tex]
Thus the above response is correct.
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(a) Some sodium chloride was found to be contaminated with Copper (ii) oxide. Describe
how a sample of sodium chloride can be separated from the mixture.
Answer:
A mixture of sodium chloride and sand in water can be separated by the process of filtration and then by the process of distillation.
Answer:
Explanation:
As this oxide is insoluble in water you would dissolved the sample of sodium chloride in water and filter off the oxide.
Then concentrate the liquid by boiling and cooling, to get crystals of pure sodium chloride.
How many muscle types is the muscular system made up of
Answer:
3
Explanation:
there are three types of muscles:
Skeletal(striated)SmoothCardiacEpsom salt can be used to season foods. How would you write its chemical
formula?
A. Na2CI B.NaCI
Answer:
B. NaCl
Explanation:
NaCl is sodium chloride, one form of it is epsom salt which we consume!
please give thanks, hit heart button! :)
Humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas, CO2.Carbon dioxide gas is
A
an element made of carbon and oxygen atoms.
B
a solution made of carbon and oxygen atoms.
C
a compound of carbon and oxygen atoms.
D
a mixture of carbon and oxygen atoms.
Answer:
A
an element made of carbon and oxygen atoms.
So I think the answer is going to be A An element made of carbon and oxygen atoms.
What is the frequency of green light
that has a wavelength of 531 nm? (c
= 3.00 x 108 m/s)
We are given:
Wavelength of Green light (λ) = 531 nm OR 531 * 10⁻⁹ m
Speed of light (c) = 3* 10⁸ m/s
Solving for the Frequency of the wave:
We know the relation:
c = νλ
(where ν is the frequency, c is the speed of light and λ is the wavelength)
3*10⁸ = ν*(531*10⁻⁹)
ν = 3*10⁸ / 531*10⁻⁹ [dividing both sides by the wavelength]
ν = 3*10⁸*10⁹ / 531 [ since a⁻¹ = 1/a]
ν = 3*10¹⁷ / 531 [ since mᵃ * mᵇ = mᵃ⁺ᵇ]
ν = 10¹⁷ / 177
ν = 1000 * 10¹⁴ / 177 [we split the numerator to simplify]
ν = 5.65 * 10¹⁴
Hence, the frequency of Green light is 5.65 * 10¹⁴ Hz
Answer:
f = 5.6×10¹⁴ Hz
Explanation:
Given data:
Wavelength of green light = 531 nm (531×10⁻⁹ m)
Frequency of green light = ?
Solution:
Formula;
Speed of wave = wavelength × frequency
Speed of wave = 3.00×10⁸ m/s
by putting vales,
3.00×10⁸ m/s = 531×10⁻⁹ m × f
f = 3.00×10⁸ m/s / 531×10⁻⁹ m
f = 0.0056×10¹⁷ s⁻¹
f = 5.6×10¹⁴ Hz (Hz = s⁻¹)
When you lift an object, you add the energy of lifting the object to the object
Answer:
Which is kinetic energy at its best, cause you are moving your arm or hand in motion, bu the object is in potential energy, where it isn't moving
Explanation:
Hydrogen bonds are formed between molecules when hydrogen is covalently bonded to an element that has a
1
small atomic radius and low electronegativity
2
large atomic radius and low electronegativity
3
small atomic radius and high electronegativity
4
large atomic radius and high electronegativity
Submit Answer
Answer:
choice 3
Explanation:
Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.
Please give thanks :)
Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.
• An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.
• Hydrogen bonds are very strong in comparison to other dipole interactions.
• A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.
• Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.
Thus, correct answer is option 3.
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A desert area has many species of cactus and brush as well as birds, snakes, lizards, and rodents. This desert is an example of a
Answer: Climax Commuity.
Explanation: (hope it’s right! Good luck!)
Please show work!
Question below::
An ideal gas, consisting of n moles, undergoes an irreversible process in which the temperature has the same value at the beginning and end. If the volume changes from Vi to Vf, the change in entropy is given by:
Answer:
ΔS = nR(In (Vf/Vi))
Explanation:
We are told the temperature has the same value and therefore it's constant.
Formula for change in entropy isothermally is;
ΔS = nR(In (V2/V1))
V2 is final volume and V1 is initial volume.
We are told that the volume changes from Vi to Vf.
Thus, V2 = Vf and V1 = Vi
Hence;
ΔS = nR(In (Vf/Vi))
Which of the following is NOT true about comparisons between analog and digital signals?
Question 3 options:
Digital signals are pulses of voltage that switch currents on an off in devices like computers.
Analog signals are used to convert sound waves into electronic signals.
Digital signals are more prone to distortion.
Analog signals are more prone to distortion.
Answer:
Analog signals are used to convert sound waves into electronic signals.
Explanation:
i think i hope i helped :))
how is your day going?
Answer
B
Explanation:
I did this quiz and i think i got it right Good luck!
heyyy Powerpuff girls! what advantage does globe maps have over a flat map?
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Explanation:
miss girl- you could've just looked this up
(just make it look like you typed it)
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Friend?
When chlorobenzene reacts with Mg in ether followed by CO2 and neutralization with dilute HCl, __________ will be formed.
a. p-chlorobenzoic acid
b. p-deuterobenzoic acid
c. benzoic acid
d. benzene
e. No correct response
Answer:
c. benzoic acid
Explanation:
The given reaction is an example of a Grignard reaction:
When chlorobenzene (C₆H₅Cl) reacts with Mg in ether, an intermediate is formed (C₆H₅MgCl).
Said intermediate then reacts with CO₂ producing a benzoic acid salt (C₆H₅CO₂X), this salt is then neutralized with dilute HCl producing benzoic acid (C₆H₅CO₂H).
which one does not share the same properties as the other
Si
Ti
At
Explain why
Answer:
Ti
Explanation:
Ti is titanium and does not share any similar properties with the likes of Si, silicon and At, astatine.
Titanium is a transition metal and a solid. Silicon and Astatine are non - metals. Silicon and Astatine also belongs to the p-block on the periodic table whereas Titanium is found on the d-block. Silicon and Astatine would prefer to take part in reactions where they can gain electrons because they are non metals whereas Titanium due to its metallic property would prefer a reaction where it can lose electrons.Which of the following pH numbers indicates a strong alkali?
a. 1
b. 5
c. 7
d.) 14
Answer:
1 is the correct answer of the question
A chemical reaction is shown below:
Glucose + Oxygen --> Water + Carbon Dioxide
How many grams of water would be produced if the reaction contained each of the following:
20 g of glucose
15 g of oxygen
30 g of carbon dioxide
SELECT AN ANSWER
15 g of water
35 g of water
65 g of water
5 g of water
Answer:
Mass = 8.46 g
Explanation:
Given data:
Mass of water produced = ?
Mass of glucose = 20 g
Mass of oxygen = 15 g
Solution:
Chemical equation:
C₆H₁₂O₆ + 6O₂ → 6H₂O + 6CO₂
Number of moles of glucose:
Number of moles = mass/molar mass
Number of moles = 20 g/ 180.16 g/mol
Number of moles = 0.11 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 15 g/ 32 g/mol
Number of moles = 0.47 mol
now we will compare the moles of water with oxygen and glucose.
C₆H₁₂O₆ : H₂O
1 : 6
0.11 : 6/1×0.11 = 0.66
O₂ : H₂O
6 : 6
0.47 : 0.47
Less number of moles of water are produced by oxygen thus it will limit the yield of water and act as limiting reactant.
Mass of water produced:
Mass = number of moles × molar mass
Mass = 0.47 mol ×18 g/mol
Mass = 8.46 g
Which property of gases is explained by the process of diffusion?
A.
their ability to compress under high temperature
B.
their ability to expand under low temperature
C.
their ability to expand under pressure
D
their ability to fill the available volume of a container
Answer:
The appropriate alternative is "Option D".
Explanation:
Diffusion would be a random or physical phenomenon that corresponds to that same transfer budget of molecules from some kind of highly concentrated area to something like a lower one. The substance which diffuses may be strong, liquids, and gaseous. Correspondingly, the framework where certain diffusion happens can however be amongst the three aspects of sustainability.All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.
what's common to H20,HF and NH3
Answer:
They all contain sone hydrogen atoms.
Explanation:
H is hydrogen doi
1) Which of the following statements are correct? Rewrite each false statement to make it true.
a) Elements listed in rows on the periodic table are in the same family.
b) Elements in the same column of the periodic table exhibit the same physical properties
c) Elements in the same group are in the same family.
d) Elements that are side by side on the periodic table belong to the same period.
21 Mamath
Answer:
a) Elements listed in rows on the periodic table are in the same family - false
Explanation:
Elements listed in groups /columns on the periodic table are in the same family.
The false statement is:
a) Elements listed in rows on the periodic table are in the same family.
Elements in the periodic table:In a periodic table, the elements are arranged in increasing order of atomic number. There are 7 periods and 18 groups in a periodic table.
The statement which is false is:
a) Elements listed in rows on the periodic table are in the same family.
The correct statement will be:
a) Elements listed in rows on the periodic table belongs to a different family.
These elements will have different properties and thus placed in periodic table.
Find more information about periodic table here:
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Between which two objects is gravitational attraction the greatest?
between the penny and the small pot
between the book and the cereal box
between the small pot and the book
between the paper clip and the penny
Answer:
Between the small pot and the book
Explanation:
Since gravitational force is influenced by the mass of an object, the higher the mass of two objects, the stronger the gravitational force.
Thus, the force between the pot and the book is strongest, since the two have the highest mass.
Have a nice day!
For doping silicon with boron, silicon specimen was kept in gaseous atmosphere containing B2O3 that maintained the B concentration at the surface of Si specimen at the level of 3*10^26 boron atoms/m^3. The process was carried out at 1100 degrees C. The diffusion coefficient of B in Si at 1100 degrees C is 4*10^-13 cm^2/s. Calculate the concentration of B at the depth of 10^-4 cm from the surface after 130 minutes of diffusion at 1100 degrees C
Solution :
From Fick's law:
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=N_a$[/tex]
Mass balance: Exits = Accumulation
[tex]-N_A A = \frac{dm}{dt}[/tex]
[tex]-N_A A = \frac{dVp}{dt}[/tex]
[tex]-N_A A = \frac{dV}{dt}p[/tex]
[tex]-N_A A = \frac{dhA}{dt}[/tex]
[tex]-N_A A = \frac{dh}{dt} \times Ap[/tex]
From the last step, area cancels out and thus leaves :
[tex]-N_A = \frac{dh}{dt} \times p[/tex]
So now we can substitute the [tex]$N_A$[/tex] by the Fick's law
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=\frac{dh}{dt} p$[/tex]
Substituting the values we get
[tex]$=\frac{-4 \times 10^{-13}}{0.0001} \times (3 \times 10^{26} - C_{A2}) = \frac{dh}{dt} \times 2.46$[/tex]
[tex]$=-4 \times 10^{-9} \times( 3 \times 10^{26} - C_{A2}) = 0.0001 \times 2.46$[/tex]
[tex]$= -7800 \times 4 \times 10^{-9} \times (3 \times 10^{26}-C_{A2})=0.000246$[/tex][tex]$=-(3 \times 10^{26}-C_{A2}) = 7.8846 \times 100 \times \frac{1}{69.62} \times 6.022 \times 10^{23}$[/tex]
[tex]$C_{A2} = 6.85 \times 10^{28} \ \text{ boron atoms} /m^3$[/tex]
A mixture of methane and oxygen gases at a total pressure of 727 mm Hg contains methane at a partial pressure of 571 mm Hg. If the gas mixture contains 3.62 grams of methane, how many grams of oxygen are present
Answer: 1.95 g of oxygen is present.
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{methane}+p_{oxygen}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 727 mm Hg
[tex]p_{methane}[/tex] = partial pressure of methane = 571 mm Hg
[tex]p_{oxygen}[/tex] = partial pressure of oxygen = ?
[tex]727=571+p_{oxygen}[/tex]
[tex]p_{oxygen}=156mmHg[/tex]
Also [tex]p_{oxygen}=x_{oxygen}\times p_{total}[/tex]
Given : 3.62 g of methane is present
moles of methane = [tex]\frac{\text{Given mass}}{\text {Molar mass}}=\frac{3.62g}{16g/mol}=0.226moles[/tex]
[tex]x_{oxygen}[/tex] = mole fraction of oxygen
=[tex]\frac{\text {moles of oxygen}}{\text {total moles}}=\frac{y}{y+0.226}[/tex]
[tex]156=\frac{y}{y+0.226}\times 727[/tex]
[tex]y=0.061[/tex]
mass of oxygen = [tex]moles\times {\text {Molar mass}}=0.061\times 32=1.95g[/tex]
Thus 1.95 g of oxygen is present.
solve the equation: 3)15.000 cm²= x dm ²
BRAINLIEST!!!!
Answer:
x = 150 dm
Explanation:
10 cm = 1 dm
100 cm² = 1 dm²
15,000 cm² = 150 dm²
Answer:
csc = (60)
cos = (390)
−4 = cot (−45)
Explanation:
make me braienst please?
