Answer:
Explanation:
Molar mass of Lithium is 6.9410 g/mol.
This means 1 mol of Li atoms weigh 6.9410 g
In 1 mol 6.022 x 10 ^ 23 atoms should be present
So, in 6.9410g , there should be 6.022 x 10 ^ 23 atoms.
So weight of 1 atom = a = 6.9410 g / (6.022 x 10^ 23)
To find weight of 3.25 x 10 ^ 24 atoms we have to multiply a by 3.25 x 10^ 24
So you will get the answer as
[6.9410 g / (6.022 x 10^ 23)] x 3.25 x 10^ 24
= 37.46 g
What is the CATHODE half-reaction for the cell
Cu(s)—> Cu2+ (aq)||Ag+ (aq)|Ag(s)?
Answer:
Ag/Ag+ electrode is cathode and Cu/Cu+ electrode is anode.
~im not sure it its correct i found it~
Explanation:
please help n let me know thank u
What differences between snow and sand
Answer:
difference is the temperature at which they melt. Snow melts at 0°C, whereas sand melts at about 1600°C! The temperature at which something melts is its melting point.similarities between viruses and fungi
Answer:
I can't think of any similarities at all.
Viruses are just an aggregation of genomic material and protein. Occasionally lipid folds around it to make a covering called an envelope.
Fungi are living, eukaryotic cells that metabolize, grow, perform energy conversions and mate with each other.
Calculate the change in enthalpy for the following reaction:
4 HCl (g) + O2 (g) → 2 H20 (g) + 2 Cl2 (g)
I will mark brainliest.
(I don't need an explanation. I just want to double check my worksheet answers.)
Answer:13hct
Explanation:
helpppppppppppppppppppppppppp
Answer:
The answer is B(the path water takes from Earth to the clouds and back again)
Nguyên tử khối của đồng
Answer:
huwattt
Explanation:
i can't understand
Which atom would you expect to have a larger atomic
radius—francium or tennessine?
Answer:
Francium bc it has the largest atomic radius
Francium has the greatest atomic radius. Despite being a highly radioactive metal with a short half-life, francium has little environmental impact.
What is francium?Francium is a chemical element with the atomic number 87 and the symbol Fr. Francium-223, its most stable isotope, has a half-life of only 22 minutes, making it extremely radioactive. It is the second-most electropositive element and the second-rarest naturally occurring element, trailing only caesium.Francium has been used to study atomic structure in addition to being used in chemistry and research. It is used in the diagnosis and treatment of cancer. It is also used in a number of spectroscopic experiments. Despite being a highly radioactive metal with a short half-life, francium has little environmental impact. Francium is created by bombarding radium with neutrons in a nuclear reactor. It is also possible to create it by bombarding thorium with protons.To learn more about francium refer to:
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State TRUE or FALSE : Nutrients are not necessary for the functioning of our body
Answer:
False
Explanation:
Nutrients are so important to our health.Nutrients are compounds in foods essential to life and health, providing us with energy, the building blocks for repair and growth and substances necessary to regulate chemical processes.
Which of the following is a salt?
C6H12O6
O2
C2H2
K C l
Answer:
it's kcl
Explanation:
the kcl should be salt
Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5795 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of BaSO4 obtained was 0.5240 g. What is the average mass of saccharin per tablet
The dissolution of a substance in another is a kind of chemical reaction.0.4575 g of saccharine is present in the ten tablets of saccharine dissolved in water.
From the information in the question, the sulfur in saccharin (C7H5NO3S) was completely converted to sulfate ion (SO4^2-). This ion was now reacted with excess barium chloride to form barium sulfate BaSO4. This later reaction occurs as follows;
SO4^2-(aq) + Ba^2+(aq) --------> BaSO4(s)
Number of moles of BaSO4 obtained = 0.5240 g/233 g/mol
= 0.0025 moles
Since the reaction is 1:1, 0.0025 moles of sulfate ions from saccharine reacted.
Molar mass of saccharine = 7(12) + 5(1) + 14 + 3(16) + 32
= 84 + 5 + 14 + 48 + 32 = 183 g/mol
Mass of saccharine in the tablet = 0.0025 moles × 183 g/mol
= 0.4575 g
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A car is accelerated at a rate of 2.5 meters/second?. If the starting speed is 5.0 meters/second, how
many seconds will it take the car to reach a final speed of 27.0 meters/second?
Answer:
8.8 seconds
Explanation:
Formula: acceleration = (v - u) /t where v = final velocity, u = initial velocity and t = time
a = 2.5 m/s²
u = 5.0
v = 27. 0
t =?
at = v - u
t = (v - u) /a
= (27- 5)/ 2.5
= 8.8 s
What caused the channel on Mars? water or lava? give reasoning and evidence
Answer:
A channel in an ancient Martian "riverbed" wasn't carved by liquid water but was built by molten lava, according to a new study of surface features on Mars. ... On Earth, lava tubes form during sustained volcanic eruptions, when lava flowing through previously solidified masses leaves behind empty channels in the rock
Explanation:
The lava, itself (when liquid) is very much above the boiling point of water, so it is not wet with liquid water, so it's a no in that sense,' he writes. ... Lava does contain a lot of water, especially prior to eruption (when it's called magma), but also as it flows across the ground,' he explained.
Answer:
it was both both if you ask me it's water
Explanation:
il explain answer if you brainly me
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Answer:B
Explanation:As the water heats up the particles will speed up hitting and colliding with each other which makes the water hot
Answer:
A.
B. the speed of the particles will increase because the thermal energy of the water in the beaker increases
B.
B. the water particles got smaller and now take up less space
If 5.0g nitrogen dioxide completed reacted, how many grams of nitric acid would form?
Answer:
71847284737283774737373737
State TRUE or FALSE : Synthetic fibers resists fire.
All fabrics will burn, but some are more combustible than others.
hope it helps
Why would you expect the materials used to make pot holders to be poor conductors of heat?
Answer:
Pot holders are meant to protect your hand from the heat of the pot, and so it would need to be a poor conductor of heat in order to do its job correctly. Silicon dioxide is a solid at room temperature and methanol is a liquid.
Na is best known as a(n):
Answer:
sodium
Explanation:
sodium is an element with the atomic no. of 11 and atomic mass of approximately 23
A particular beer is 65.0% ethanol by volume . If a single bottle of beer contains a total of 750.0 mL of beer, what volume, in mL of ethanol (C₂H₆O), are present in the bottle?
SHOW CONVERSION
The volume in mL of ethanol (C₂H₆O) present in the bottle is 487.5L
HOW TO CALCULATE VOLUME OF ETHANOL:
According to this question, a particular beer is 65.0% ethanol by volume. This means that the beer contains 65/100 of ethanol. If a single bottle of beer contains a total of 750.0 mL of beer, the volume of ethanol in the bottle is calculated as follows:= 65/100 × 750= 65 × 7.5= 487.5mLTherefore, volume in mL of ethanol (C₂H₆O) present in the bottle is 487.5LLearn more at: https://brainly.com/question/8725232?referrer=searchResults
explain the role of sulphuric acid in limit test for iron
help pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Answer:
evaporation
Explanation:
An example of this is when puddles evaporate into the air after it has rained. Condensation is the opposite: gas → liquid
Hope this helps!
How will you describe the appearance of a saturated solution?
Answer:
A saturated solution is one where there are equal numbers of particles, or solutes, and solvent in the solution.
Explanation:
The characteristics of a solvent are that it can be a liquid, a solid, or a gas; although the solvent is usually a liquid. When a solution cannot have solute added and dissolved, the solution is saturated.
Explanation:
A saturated solution is one where there are equal numbers of particles, or solutes, and solvent in the solution
A sample of gas at 1.0°C is expanded at constant pressure from 10 L to 15 L. The final temperature is:
a: 1.50 °C
b: 411 °C
c: None of all
d:138 °C
e: 183 °C
Answer:
y
Explanation:
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Use the bond enthalpy data given to estimate the heat released when 6.50 g of
nitrogen gas reacts with excess hydrogen gas to form ammonia at 25C.
Answer:
24.9
Explanation:
-
Please help XD answer all of these questions to get 70 pnts!
Answer:
1 Density- degree of consistency measured by the quantity of mass per unit volume.
2 Cubic centimeters
3 Volume- Volume is the amount of space occupied by a substance, while mass is the amount of matter it contains. The amount of mass per unit of volume is a sample's density.
4 Liters
5 Mass- Scientific Definition of Mass Mass is the quantity of inertia (resistance to acceleration) possessed by an object or the proportion between force and acceleration referred to in Newton's Second Law of Motion (force equals mass times acceleration). In other words, the more mass an object has, the more force it takes to get it moving.
Explanation:
Answer:
What is density? The measure of how much matter is in a certain volume.
Which one of these are not a unit of volume? Answer: m² is not a unit of volume.
What is Volume? The length of an object.
Which of these is not a unit of mass? Metric ton (t)
What is mass?A measure of the amount of matter in an object or substance.
When two atoms bond chemically it is because of the interaction between
A) the nuclei of each atom.
B) the protons in each atoms.
C) all electrons in the atoms.
D) the valence electrons in each atom.
Answer:
C
Explanation:
It depends on the bonding for an explanation.
If one atom is a metal and one is a non metal it will be ionic. This is because one atom transfers its electron to the other atom giving them both a charge. They will then be bonded due to opposite forces of attraction.
If both atoms are non metals it will be covalent. Electrons pair together in the center of two atoms that have merged together and they share their electrons.
(Makes more sense with diagrams)
Some chemicals, most often inorganic salts, in the laboratory have the nasty tendency to absorb water from the atmosphere. This property is called hygroscopicity. Anhydrous (water-free) Cupric Perchlorate [Cu (ClO4)2] weighs 262.447g/mol, but after sitting on out on the bench top absorbs water from the air and now weighs 370.540g/mol. How many water molecules did our Cupric Perchlorate absorb?
If an anhydrous Cupric Perchlorate weighs 262.447g/mol initially and weighs 370.540 g/mol after sitting on the bench to absorb water from the air, the number of water molecules absorbed would be 6 moles.
First, let us calculate the amount of water gained during the course of staying on the bench:
Water gained = weight after gaining water - initial weight
= 370.540 - 262.447
= 108.093g/mole
The total amount of water gained per mol is 108.093. Each water molecule weighs 18.015 g/mole. Thus, the total number of water molecules that will sum up to 108.093 would be:
108.093/18.015 = 6 moles
In other words, the number of water molecules absorbed by the Cupric Perchlorate is 6 moles.
More on calculating water of hydration can be found here: https://brainly.com/question/919417
When the electron from the n=4 excited state drops to the ground state, does it absorb energy or emit energy?
Answer:
It emits energy since to move from a higher energy level to a lower energy level or ground state, it must lose energy.
Suppose you did the lab and someone came and said your unknown acid sample was
actually HCl instead of H2SO4. Everything else remains the same; the standard acid was H2SO4,
the base was NaOH. What would change in your final calculation of the unknown acid
concentration
Answer:
H2SO4
Explanation:
because it's not more acidic
Both sulfuric acid and hydrochloric acid are potent acids, but hydrochloric acid is stronger. Because HCl is monoprotic and H2SO4 is diprotic, they differ mostly in their acid types.
Can HCl be substituted for H2SO4?Instead of using hydrochloric acid, sulphuric acid (H 2 SO 4) is preferred because: This acid is commonly utilized for a variety of neutralization reactions. Sulphuric acid is more potent than all other acids and is also simpler and safer to use. Even if there is a risk for negative reactions, they are uncommon.
The majority of the time because it is for a redox reaction or titration in which HCl would react to produce chlorine on its own. You could use phosphoric or sulfuric acid.
In this situation, H 2 SO 4 is preferable to HCl. Due to the considerable acidity of H 2 SO 4, the solution is made to be more acidic than HCl. As a result, the findings of titration using H 2 SO 4 are more precise. H 2 SO4 generates two hydronium ions, whereas HCl only generates one.
It shows how many protons split apart to create hydronium ions. The acid will be more potent the lower the pKa value. Therefore, we can conclude that HCl is more acidic than H2S O 4.
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What is a small description of a atom