Answer:
it helps them retain their charge longer
Explanation:
:)
The molecular mass of a substance is defined as the mass of how many molecules of the substance
Answer:
Explanation: The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance
Several balloons are inflated with helium to a volume of 0.75 L at 27°C. One of the balloons was found several
hours later, the temperature had dropped to 22°C. What would be the volume of the balloon when found, if no
helium has escaped? (0.74L)
Answer:
V₂ = 0.74 L
Explanation:
Given data:
Initial volume of balloon = 0.75 L
Initial temperature of balloon = 27°C (27+273.15 K = 300.15 K)
Final volume of balloon = ?
Final temperature = 22°C (22+273.15 K = 295.15 k)
Solution:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 0.75 L × 295.15 k / 300.15 K
V₂ = 221.36 L.K / 300.15 K
V₂ = 0.74 L
The given problem is solved through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
How many grams of water can be produce from the complete reaction of excess nitric acid and 33.2 mL of 0.245 M lithium hydroxide solution, assuming that lithium hydroxide is the limiting reactant?
Mass of water produced : 0.146 g
Further explanationGiven
33.2 mL of 0.245 M lithium hydroxide
Required
mass of water
Solution
Reaction
HNO₃ (aq) + LiOH (aq) → H₂O (l) + LiNO₃ (aq)
mol LiOH :
= M x V
= 0.245 x 33.2 ml
= 8.134 mmol
From the equation, the mol ratio of HNO₃ : H₂O = 1 : 1, so mol H₂O = 8.134 mmol
mass H₂O :
= mol x MW
= 8.134 x 10⁻³ mol x 18 g/mol
= 0.146 g
Describe how muscles make movement
Answer:
Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
Explanation:
Hope it helps
Which statement(s) is/are TRUE about covalent bonds?
Covalent bonds can form between atoms of
different elements.
Covalent bonds can form between a metal atom
and a nonmetal atom.
Covalent bonds can form between two metal
atoms.
Covalent bonds can form between two nonmetal
atoms.
Covalent bonds can form between atoms of the
same element.
Answer:
1. Covalent bonds can form between two nonmetal atoms.
2. Covalent bonds can form between atoms of the same element.
3. Covalent bonds can form between atoms of different elements.
Explanation:
I hope this helps u! :D
Explanation:
10.8 g of aluminium reacts with excess oxygen to form aluminium oxide: 4Al + 3O2 → 2Al2O3. What is the theoretical yield of aluminium oxide? (Relative masses: Al = 27.0, Al2O3 = 102.0)
Answer:
Theoretical yield = 40.8g
Explanation:
4Al + 3O2 ----] 2Al2O3
if 27.0g of Al ----] 102.0g of 2Al2O3therefore 10.8g -----] xg10.8g×102.0g/ 27.0g
theoretical yield = 40.8 g
Answer:
20.410 grams of Al2O3 are produced
Explanation:
First, we need to calculate the number of moles of aluminum that are actually reacting..
We will convert from grams to moles using the atomic weight which (for aluminum) is 26.982 g/mol (which can also be rewritten as 1 mol/26.982)
10.8 g Al * 1 mol Al/26.982 g Al = 0.4002668446 moles Al
**Grams cancel out, so we are left with moles
(I would type this differently so that it would make more sense visually, however brainly is giving me errors, so try writing it out yourself if it doesn't initially make sense..put the equation in fraction form)
Now that we have the moles of Al, we will convert from moles of Al reacting to moles of aluminum oxide produced..
To do this we will use the balanced chemical equation..
4Al + 3O2 -> 2Al2O3
Using the balanced chemical equation, we can see that for every 4 moles of aluminum that react, 2 moles of aluminum oxide are produced..
0.4002668446 moles Al * 2 mol Al2O3 / 4 mol Al
= 0.2001334223 moles Al2O3..
Now we need to convert from moles of Al2O3 to grams..
We can do this using the atomic weight of Al2O3..
The atomic weight of Al2O3 is 101.961 g/mol or 1 mol/101.961 grams
Now we will convert to grams of Al2O3...
0.2001334223 moles Al2O3 * 101.961 grams Al2O3/1 mol Al2O3
= 20.40580387..
20.410 grams of Al2O3 are produced
7 Coal was produced in the earth over millions of years. Which of the following is NOT a step in
the production of coal?
А Animals died and were covered by sediment.
B Plants died and were covered by sediment.
C Heat, pressure, and time change the peat to lignite.
Time and pressure changes dead plant material to peat.
D
Answer:
D. Time and pressure changes dead plant material to peat.
Explanation:
There are four steps in the production of coal: peat, lignite, bituminous and anthracite.
Peat: in this stage dead plants are oxidized to water and carbon dioxide and buried under sediments. The partial decomposition of plant matter due to the absence of oxygen is called peat. There is no factor of time and pressure that changes dead plant material to peat.
Lignite: Peat is subjected to heat, pressure, and time to form lignite.
Bituminous: More pressure in lignite removes all the traces of plant matter and form “soft coal”, bituminous coal.
Anthracite: It is the last stage, in which hard coal forms with the combined pressure and high temperature.
Hence, the correct answer is "D. Time and pressure changes dead plant material to peat."
8. Name at least three properties of stars revealed by spectral characteristics:)
A stellar spectrum can reveal many properties of stars, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.
How many moles of zinc chloride will be produced when 112 grams of zinc oxide is used?
Answer:
1.38 moles
Explanation:
My teacher gave us the answer on a quiz so here if y’all want a explanation I’ll give y’all one tho
An Atom that was neutral has now gained 3 electrons. Do you think this Atom will become a cation or an anion?Why?(In at least 2 sentences.)
Claim
Evidence
Reasoning
Answer: It will become an anion. Anions are negatively charged molecules. So if the molecule is charged by electrons and electrons have a negative charge, it must form an anion.
Explanation:
Which combination is most likely to form a precipitate?
A. ammonium hydroxide
B. barium chloride
C. calcium hydroxide
D. calcium acetate
E. iron hydroxide
Answer:
A - Ammonium Hydroxide (NH3)
Explanation:
• Metals are just too weak
• Calciums' have a low success rate
• Barium is good, but Ammonium is just stronger.
(This is just an opinion, I could definitely be wrong so just do corrections in class. Sorry)
Answer:
A
Explanation:
I think lol
Which of the following group of salts can be prepared by direct combination
a sulphate
b nitrate
c chloride
d phosphate
Salt water, like koolaid, or coffee with
sugar are all
mixtures
Answer:
yes
Explanation:
What three steps are involved in forming igneous rocks? WILL GIVE BRAINLEST AND POINTS
Melting, cooling, and hardening
Freezing, heating, and hardening
Melting, condensing, and softening
Freezing, evaporating, and softening
Answer:
I am pretty sure it is the first one: Melting, cooling and hardening
Explanation:
igneous rocks are made of molten lava and then they cool down and harden form into a rock. PLEASE correct me if i am wrong.
what are the 3 phases of matter?
Answer:
The three major phases of matter are Solid, Liquid, and Gas. But there is also Plasma
the three-legged dog, has a mass of 24Kg and accelerates .85 m/s. How much force is needed to get Lucky moving
Answer:
the answer is 2040
Explanation:
force is given as the product of mass and acceleration
Rank the states of matter from particles with the least amount of attraction (1st) to particles with the most attraction (3rd). State of Matter Rank (1st, 2nd, 3rd)
Solid
Liquid
Gas
please help! I've asked the question twice now.
Can you help me with drawing the structure of 3 propyl hex-1-ene?
Answer:
I have the image drawn, it'll be attached.
Explanation:
3 propyl hex-1-ene
Which of the following statements accurately
paraphrases evidence from the article to support
the conclusion?
A
Quantitative data is based on numbers, while
qualitative data is based on observations.
B.
Qualitative observations often lead to deeper
study using quantitative measurements.
С
Qualitative data is based on numbers, while
quantitative data is based on observations,
D
Quantitative observations often lead to deeper
study using qualitative measurements
cal the vol of carbon(ii)oxide produced at stp by. d dehydration of 6.00g of methanoic acid with concentrated H2SO4 carbon=2 oxygen=16 hydrogen=1
molar volume = 22.4dmcube
The volume of CO= 2.912 L
Further explanationGiven
Dehydration of 6 g of methanoic acid with H2SO4
Required
The volume of CO
Solution
Reaction
HCOOH ⇒ CO+H₂O
MW = 1.Ar C+2.Ar H+2.Ar O
MW = 1.12+2.1+2.16
MW= 46 g/mol
mol = mass : MW
mol = 6 g : 46 g/mol
mol = 0.13
From equation, mol ratio HCOOH : CO, so mol CO = 0.13
Vm = 22.4 L
so for 0.13 mol :
= 0.13 x 22.4 L
= 2.912 L
HELP ITS TIMED!!!!!!!!!!!!!!!!
1-Butyne and 2-butyne are position isomers.
Select one:
a. True
b. False
Answer:
False
Explanation:
Can someone please help me !!
- It would mean a lot ❤️
_______________________________
KendallIf something is heretic, it refers to certain characteristics that is coded in our DNA. In science we know that this is possible through understanding the workings of the chromosomes & their functions.
_______________________________
What is the potential energy of your 3kg puppy that is sitting in the grass in your backyard
Answer:
0J
Explanation:
The potential energy of the sitting puppy is 0J.
Since we have been given the mass of the puppy to be 3kg, to find the potential energy, we use the expression below:
Potential energy = mgh
m is the mass
g is the acceleration due to gravity
h is the height
So the puppy is sitting on the grass, the height is 0m
Therefore, Potential energy is 0J
How many moles in 4.3 x 1024 atoms of sodium (Na)?
Answer:How many ions are in 2 moles of NaCl?
2 mol NaCl = 2 x 6.02 x 10 23 = 1.204 x 10 24 NaCl formula units 2 mol NaCl = 2 (2 x 6.02 x 10 23 )= 2 (1.204 x 10 24) = 2.408 x 10 24 atoms *2 moles of sodium chloride contains 2.408 x 10 24 ions (combination of Na + ions & Cl – ions). H
Explanation:
sorry i was running out of time
Lori is saving money to buy a new bike. She needs $120 but has only saved 60%.
How much money has she saved so far to go towards the bike?
The atmosphere consists of (a) Gases only (b) Water vapour only (c) Chemicals (d) Gases and water vapours science
Answer:
(d) Gases and water vapour
Explanation:
The atmosphere is a part of the Earth that contains predominantly gases or gaseous substances. In other words, the atmosphere is a combination of different gases, including water vapour.
Atmosphere is said to contain the following gases in the following proportion:
- Nitrogen (78%)
- Oxygen (21%)
- Argon (0.9%)
- Carbon dioxide (0.04%)
- Water vapour (1-4%)
Therefore, the Earth's atmosphere consists of many gases and water vapour.
How can you tell if a sample contains baking soda and cornstarch or baking powder?
Answer:
To find out if a sample has baking soda we can add vinegar.
Explanation:
When vinegar (acetic acid) is mixed with salt (sodium bicarbonate), water, carbon dioxide and sodium acetate are formed. We see the formation of bubbles (which is carbon dioxide, which is a gas).
In an aqueous solution of potassium chloride, the solute is *
1. KCI
2. O H20
3. K
4. CI
Answer:
1.KCl is answer
Explanation:
when potassium chloride KCl is dissolved in water,it will dissociate to form k+ and cl- .thus,the solute must be k+Cl- .
I hope it's helpful!
The substance dissolved in a solvent or water is called a solute it makes up the homogenous mixture called solution by getting dissolved in it.
The [tex]\rm KCl[/tex] is the solute in the aqueous solution of [tex]\rm KCl[/tex].
The solute can be explained as:The substance that dissolves in an aqueous solvent or any other solvent to form a solution is called a solute.[tex]\rm KCl[/tex] is a solute that dissolves in the water to yield [tex]\rm K^{+}[/tex] and [tex]\rm Cl^{-}[/tex] ions to produce the solution of potassium chloride.Therefore, option A, [tex]\rm KCl[/tex] is the solute.
Learn more about solute and solvent here:
https://brainly.com/question/14521586
which group served as the control in this investigation
Answer:
What is the investigation?
Explanation:
.
A hot plate, a large beaker of water, and grains of rice are used in a class demonstration. When the water begins to boil, the rice moves in a circular pattern. The model demonstrates
Answer:
Conduction
Explanation:
