Answer:
the second one
Explanation:
metal doesn't act like a magnet because the domains don't have a preferred direction of alignment. Magnets are all aligned in a specific direction.
Where does thermal energy go? Assuming you forgot your hot food and came after a while and found it cold now. Where did the energy go?
What kinds of matter have thermal energy
Answer:
Thermal energy comes from heat sources that provide energy from it's temp.
Explanation:
Produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy. 6 min, 47 sec Heat Energy.
(If this doesn't help let me know in the comments, I'll try to explain better :> )
Why do women have more reactions to vaccines?
Experts say this isn’t unusual with vaccinations because the estrogen in women’s bodies is designed to elicit a stronger immune response.
Hope it helps you ☺
Happy Learning ⭐
Convert 1.55 x 10^24 ATOMS OF CARBON TO MOLES OF CARBON
Answer:
2.57 moles of carbon
Explanation:
1 mole = 6.023x10^23 (this is called avogadro's number)
1/6.023x10^23
1.55x10^24 = 1.55x10^24/6.023x10^23 = 2.57 moles
this means, 1.55x10^24 atom contains 2.57 moles of carbon
Which of these is a carbohydrate?
1. C6 H12 O6
2. C6 H6 O12
3. C6 H13 O2 N
4. C3 H7 O2 Ns
Answer:
C6H12O6
Glucose
Explanation:
Glucose is a monocarbohydrate
carbohydrates always have only C, H, and O
brainliest plz
Will give brainlist please help
PLEASE ANSWER True or False: When adding reactions together to get a desired reaction you must also add their enthalpies to get the enthalpy of that desired reaction.
Answer:
true
Explanation:
Why didn't you just clean the spill with water?
Answer:
if you did it would probably make it bigger...
Explanation:
:)
It is device used to measure thee temperature of food/fish
25. What is a subdivision of a family? *
O kingdom
O domain
O genus
O species
What is the phase label on CI?
A. aq
B.
C. e
D. g
E. s
Answer:
Pubic hair smells bad
Explanation:
A student performed a similar experiment we have done, with Ag and O to produce silver oxide.
Mass of crucible and lid: 29.307 g
Mass of crucible, lid, and silver: 30.958 g
Mass of crucible, lid, and silver oxide: 31.080 g
Use the above data to calculate the moles of the metal used in this experiment. your answer must include correct significant figures and unit.
Answer:
0.0153 mol
Explanation:
Mass of crucible and lid: 29.307 g
Mass of crucible, lid, and silver: 30.958 g
Number of moles = Mass /Molar mass
Mass of Silver = Mass of crucible, lid, and silver - Mass of crucible and lid
Mass of siilver = 30.958 g - 29.307 g
Mass of silver = 1.651 g
Molar mass of silver = 107.868 g/mol
Number of moles = 1.651 g / 107.868 g/mol
Number of moles = 0.0153 mol
For each of the following acid-base reactions,
calculate the mass (in grams) of each acid necessary
to completely react with and neutralize 3.65 g of the
base.
Part A
HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
Part B
2 HNO3(aq) + Ca(OH)2(aq)
2 H2O(1) + C
Answer: A. 3.28 g of HCl
B. 6.30 g of [tex]HNO_3[/tex]
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} NaOH=\frac{3.65g}{40g/mol}=0.09moles[/tex]
[tex]\text{Moles of} Ca(OH)_2=\frac{3.65g}{74g/mol}=0.05moles[/tex]
a) [tex]HCl(aq)+NaOH(aq)\rightarrow H_2O(l)+NaCl(aq)[/tex]
According to stoichiometry :
1 mole of [tex]NaOH[/tex] require = 1 mole of [tex]HCl[/tex]
Thus 0.09 moles of [tex]NaOH[/tex] will require=[tex]\frac{1}{1}\times 0.09=0.09moles[/tex] of [tex]HCl[/tex]
Mass of [tex]HCl=moles\times {\text {Molar mass}}=0.09moles\times 36.5g/mol=3.28g[/tex]
b) [tex]2HNO_3(aq)+Ca(OH)_2(aq)\rightarrow 2H_2O(l)+Ca(NO_3)_2(aq)[/tex]
According to stoichiometry :
1 mole of [tex]Ca(OH)_2[/tex] require = 2 moles of [tex]HNO_3[/tex]
Thus 0.05 moles of [tex]Ca(OH)_2[/tex] will require=[tex]\frac{2}{1}\times 0.05=0.1moles[/tex] of [tex]HNO_3[/tex]
Mass of [tex]HNO_3=moles\times {\text {Molar mass}}=0.1moles\times 63g/mol=6.3g[/tex]
What season is represented in the northern hemisphere? *
5 points
Captionless Image
A. Spring
B. Summer
C. Fall
D. Winter
Answer:
B. summer
Explanation:
The northern hemisphere experiences summer during the months of June, July, and August because it is tilted toward the sun and receives the most direct sunlight.
What does efficient mean in your own words
Answer:
llo
Explanation:
efficent: well orgainzed, completed with mimumin amount of effort
capable is the correct answer accept it surely
16. When a person looks up into the sky and
sees a full moon, what fraction of the
bright surface of the moon do we see?
Answer:we see 1 side because the other side is not visible
Explanation:
what mass of sodium hydroxide is needed to neutralise 24.5kg of sulfuric acid
H2SO4 + N2 = 2NH3
Answer:
23.92 g
Explanation:
Molar mass of H2SO4 = (2×1)+32+(16×4)= 2+32+48= 82g/mol
H2SO4 + 2NaOH ---> Na2SO4 + 2H2O
I mole of H2SO4 = 2 moles of NaOH
24.5/82 = 24.5/82 × 2
= 0.598 moles of NaOH will neutralize
Mass= mole× molar mass
Molar mass of NaOH= 23+16+1 = 40g/mol
Mass= 0.598 × 40 = 23.92g of NaOH
Answer:
20g
Explanation:
First of all, you have got your formula wrong. It should be [tex]H_{2}SO_{4} + 2NaOH = Na_{2}SO_{4} + 2H_{2}O[/tex].
Start by finding the Relative Formula Mass for sulfuric acid. [tex]H_{2}SO_{4}[/tex] is equal to (2x1)+32+(16x4)=98. You then calculate Mols by doing [tex]Mols=\frac{Mass}{Relative Formula Mass}[/tex]. So, [tex]\frac{24.5}{98} = 0.25[/tex], so the Mols of Sulfuric Acid is 0.25.
The Mol ratio of Sulfuric Acid to Sodium Hydroxide is 1:2, so 0.25:0.5.
Now, you have to find the Relative Formula Mass of Sodium Hydroxide, or [tex]NaOH[/tex]. 23+16+1=40. Finally, multiply 0.5 by 40, and you'll find that the maximum mass is 20g.
In a Sodium ion 11Na +1
atomic number =11
mass number =23 ,
the number of electrons =
Answer:
11 electrons
Explanation:
The number of electrons is the same as the number of protona in a ATOM.
They will most likely be different in a ion, simple bond or a convalent bond.
What is the electron configuration for
beryllium (atomic number = 4)?
А
B
1s22s
2.
2s22p
2
Answer:
1s22s2
Explanation:
what explains the bonding in a compound made from carbon and hydrogen
1) ch4 because every hydrogen gets two electrons to bond
2) ch4 because 8 electrons are shared in this molecule
Answer:
2) ch4 because 8 electrons are shared in this molecule
Explanation:
The bond between carbon and hydrogen in the molecule; CH4 is a covalent bond. This bond involves sharing of electrons. Carbon has a valency of 4 and needs four more electrons to complete it's electronic configuration. These 4 electrons are taken care of by the 4 hydrogen atoms which each have a valency of 1.
Molecules in a substance change into a new kind of molecule during a phase change.
Answer:
A phase change is occurring; the liquid water is changing to gaseous water, or steam. On a molecular level, the intermolecular forces between the water molecules are decreasing. The heat is providing enough energy for the water molecules to overcome these attractive forces.
Please mark as brainliest
Have a great day, be safe and healthy
Thank u
XD
The phase transition takes place at the molecular level by changing the strength of intermolecular forces between the molecules.
What is phase change?Phase changes can be defined as the physical processes of transition between a state of a medium, identified by some parameters. These changes in states of matter that can be written as liquid, gas, solid, and plasma.
A particular phase in a thermodynamic system exhibits uniform physical properties. During a phase transition, some properties of the medium change, because of the change in external conditions, such as temperature, and pressure.
In a solid state, the molecules are compactly bound by a strong force of attraction. In the liquid state, the molecules have lesser attraction forces. The phase changes depend upon the temperature and pressure.
Therefore, phase transitions occur on a molecular level as the alteration in the strength of intermolecular forces.
Learn more about phase changes, here:
brainly.com/question/14817790
#SPJ2
Help please it’s due in 3 minutes
Answer:
A
Explanation:
Both students are Pushing/Pulling towards the same direction meaning if enough force is applied the object will move into that direction
Air in a closed cylinder is heated from 15°C to 36°C. If the initial pressure is 1000 torr, determine what is the final pressure? *
Answer:
1072 torr
Explanation:
To answer this problem we can use Gay-Lussac's law, which states:
P₁T₂=P₂T₁Now we convert the given temperatures into K:
T₁ = 15°C ⇒ 15+273.16 = 288.16 KT₂ = 36°C ⇒ 36+273.16 = 309.16 KWe input the data:
1000 torr * 309.16 K = P₂ * 288.16 KAnd solve for P₂:
P₂ = 1072 torrA balloon has a volume of 105 Lif the temperature is 20 °C. If the temperature is -55°C,
what will be the volume of the volume?
Answer:
78.12 L
Explanation:
Given that,
Initial volume, V₁ = 105 L
Initial temperature, T₁ = 20°C = 20+273 = 293 K
New temperature, T₂ = -55 °C = 218 K
We need to find the new volume of the balloon. The relation between the volume and the temperature is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Where
V₂ is the new volume
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{105\times 218}{293}\\\\V_2=78.12\ L[/tex]
So, the new volume is 78.12 L.
what is the volume, in liters, of 5.500 mol of C3H3 gas at STP
Answer:
123.2 Liters.
Explanation:
At STP (T = 273K & P = 1atm), one mol of any gas will occupy 22.4 liters.
With the above information in mind, we can calculate how many liters would 5.500 mol of gas occupy:
5.500 mol * 22.4 L / mol = 123.2 L
So 5.500 moles of C₃H₃ would have a volume of 123.2 liters at STP.
Calculate the number of moles in 42.15g of magnesium carbonate.
Answer:
0.5mol
Explanation:
Please mark as brainliest
HELPPP PLZz nowww!!!
A. C
B. B
C. A
D. D
Answer:
b
Explanation:
Answer:
answer b I think so I'm.not clear about it ,I think its CRT ans plz follow me
i need help with this ASAP please i don’t understand this
Answer:
750 mmHg
Explanation:
From the question given above, the following data were obtained:
Partial pressure of CO₂ (Pₐ) = 250 mmHg
Partial pressure of N₂ (P₆) = 375 mmHg
Partial pressure of He (P꜀) = 125 mmHg
Pressure of the mixture (Pₜ) =?
The pressure of the mixture of the gases can be obtained as follow:
Pₜ = Pₐ + P₆ + P꜀
Pₜ = 250 + 375 + 125
Pₜ = 750 mmHg
Therefore, the pressure of the mixture of the gases is 750 mmHg
What's the mass in grams of 0.334 moles of sucrose (C12H22O11)?
Answer:
114.23g
Explanation:
Mass = xg
Mole = 0.334 mol
Molar mass of Sucrose
(C = 12, H = 1, O = 16)
C12H22O11
(12×12)+(1×22)+(16×11)
144 + 22 + 176
342g/mol
Mass = No of mole × Molar mass
Mass = 0.334 × 342
Mass = 114.228
Mass ≈ 114.23g
please help due in 2 minutes
Answer:
1
Explanation:
the answer is the first option because it's at less of an incline than the others, hope this helps!