Answer:
Explanation:
84.97
what is the mass of 5.8 moles of H2S
Answer:
Mass = 197.78 g
Explanation:
Given data:
Number of moles = 5.8 mol
Mass of H₂S = ?
Solution:
Formula:
Mass = number of moles × molar mass
molar mass of H₂S = 34.1 g/mol
by putting values,
Mass = 5.8 mol × 34.1 g/mol
Mass = 197.78 g
Thus, 5.8 moles of H₂S have 197.78 g mass.
Trees, birds, and bacteria are all similar because they are all formed from
Answer:
Cells or atoms
Explanation:
Answer:
are made of one or more cells.
need energy to stay alive.
respond to stimuli in their environment.
grow and reproduce.
maintain a stable internal environment.
Explanation:
Plz brainliest
Consider four elements from Group 17: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy? A. fluorine B. chlorine C. bromine D. iodine E. You need more data to predict the first ionization energy of these elements.
Answer:
A. Fluorine
Explanation:
I got it right on Plato.
When 80.0 grams of calcium chloride react with silver nitrate, how many grams of silver
chloride are produced?
CaCl2 + 2 AgNO3 - Ca(NO3)2 + 2 AgCI
Answer:
Mass = 206.38 g
Explanation:
Given data:
Mass of calcium chloride = 80.0 g
Mass of silver chloride formed = ?
Solution:
Chemical equation:
CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl
Number of moles of CaCl₂:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 110.98 g/mol
Number of moles = 0.72 mol
Now we will compare the moles of CaCl₂ and AgCl
CaCl₂ : AgCl
1 : 2
0.72 : 2/1×0.72 = 1.44 mol
Mass of silver chloride:
Mass = number of moles × molar mass
Mass = 1.44 mol × 143.32 g/mol
Mass = 206.38 g
50 POINTS TO WHO ANSWERS THIS!!!
Select from the drop-down menu to correctly complete the sentence.
In order for a chemical reaction to take place, a certain amount of must be present.
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature
Answer:
Temperature
Explanation:
Rust forms when the iron is exposed to water and oxygen.
True
False
Answer: true
Explanation:
C3Hg + 02 → CO2 + H2O
This chemical equation represents the combustion of propane. When correctly balanced, the coefficient for water
is
16.
2.
8.
4.
Answer:
4
Explanation:
The following equation, which depicts the combustion of propane, is given in this question as follows:
C3H8 + 02 → CO2 + H2O
However, this equation is not yet BALANCED because the number of atoms of each element is not the same on the reactant and product side. To balance the equation, we make use of COEFFICIENT to ensure that the number of atoms of each element on both side correlates.
The balanced equation is as follows:
C3H8 + 502 → 3CO2 + 4H2O
Therefore, the coefficient for water (H2O) after balancing the equation is 4.
The study of chemicals is called chemistry.
The correct answer is D.
The equation is not yet BALANCED because the number of atoms of each element is not the same on the reactant and product sides.
To balance the equation, we make use of COEFFICIENT to ensure that the number of atoms of each element on both sides correlates.
After balancing the equation is as follows:
[tex]C_3H_8 + 50_2 → 3CO_2 + 4H_2O[/tex]
Hence, the correct answer is 4 which shows the balanced water.
For more information, refer to the link:-
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Is baking soda an acid, base, or neutral
Answer:
Baking soda is an alkaline, or base, substance. This means that when we dissolve baking soda in water, it forms an alkaline solution. For example, a 0.1 molar solution of baking soda has a pH of around 8.3. Lemon juice contains citric acid and has a pH of around 3.
When 25.0 g of Mg with 25.0 g of l2, what was the limiting reactant? How many grams of the limiting reactant are left over? How many grams of the other reactant (in excess) is left over?
Limiting reactant = I₂
Mass of Mg leftover = 22.628 g
Further explanationGiven
Reaction between 25.0 g of Mg with 25.0 g of l₂
Required
The limiting reactant
mass of limiting and excess left over
Solution
Reaction
Mg + I₂⇒ MgI₂
mol Mg = 25 g : 24.305 g/mol = 1.029
mol I₂ = 25 g : 253.809 g/mol = 0.098
Limiting reactant = I₂
Excess reactant = Mg
The limiting reactant will be used up
Mol excess(unreacted) :
=1.029 - 0.098
=0.931
Mass I₂ left over :
= 0.931 x 24.305
= 22.628 g
Consider the double replacement reaction given below: HgNO3(aq) + KBr(aq) → HgBr (??) + KNO3(??)The state of matter for HgBr would be
Answer: The state of maater for HgBr is solid.
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]HgNO_3(aq)+KBr(aq)\rightarrow HgBr(s)+KNO_3(aq)[/tex]
what displays the number of atoms, nature and bond types in organic compounds
Answer:
Structural formula
Explanation:
Various type of formulae describe an organic compound. The empirical formula only shows the ratio of atoms of each element present. The molecular formula shows the exact number of atoms of each element present.
Lastly, the structural formula shows us the arrangement of these atoms in space. It shows us the number of atoms, nature and bond types in organic compounds.
The structural formula enables us to picture what the real molecule must look like.
Physical and chemical properties are used to describe and identify matter. Physical properties can be observed without changing the identity of the substance. Chemical properties can be observed by attempting to change the identity of a substance. What are two physical and chemical properties that you can use to help you identify a substance?
Extensive properties, such as mass and volume, depend on the amount of matter that is being measured. ... Both extensive and intensive properties are physical properties, which means they can be measured without changing the substance's chemical identity
How many hydrogen molecules are in 1.2 moles of hydrogen?
Answer:
7.22 x 10²³molecules
Explanation:
Given parameters:
Number of moles of hydrogen = 1.2moles
Unknown:
Number of molecules of hydrogen = ?
Solution:
From the concept of moles, a mole of a substance contains the Avogadro's number of particles.
1 mole of a substance = 6.02 x 10²³ molecules;
So; 1.2 moles of hydrogen = 1.2 x 6.02 x 10²³ molecules;
= 7.22 x 10²³molecules
In the Martian movie, how did the NASA discover Watney is alive?
Answer:
In the film version, they discover that he is still alive by noticing two things on the satellite imagery:
The Rover has been moved from where it was parked originally (prior to the evacuation)
The solar panels had been cleaned.
They also spotted tents attached to the hab for growing potatoes. In the film, the potatoes were grown completely inside the HAB, so no external tents would have been seen by the satellite.
Magnesium reacts with iron chloride solution. Calculate the mass of iron produced in mg
Answer: 0.000187 mg of iron is produced.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Mg=\frac{0.120g}{24g/mol}=0.005moles[/tex]
[tex]3Mg+2FeCl_2\rightarrow 2Fe+3MgCl_2[/tex]
As [tex]FeCl_2[/tex] is the excess reagent, [tex]Mg[/tex] is the limiting reagent.
According to stoichiometry :
3 moles of [tex]Mg[/tex] give = 2 moles of [tex]Fe[/tex]
Thus 0.005 moles of [tex]Mg[/tex] give =[tex]\frac{2}{3}\times 0.005=0.0033moles[/tex] of [tex]Fe[/tex]
Mass of [tex]Fe=moles\times {\text {Molar mass}}=0.0033moles\times 56g/mol=0.187g=0.000187mg[/tex] (1g=1000mg)
Thus 0.000187 mg of iron is produced.
Are most snakes venomous or nonvenomous?
Answer:
nonvenomous
Explanation:
Answer:
Around a quarter of all snake species are identified as being venomous. Most are harmless, but others have potent venom and at least five species, including the boomslang (Dispholidus typus), have caused human fatalities.
Explanation:this what go ogle has to say
Over the past week, Anna has been very curt with shondra, and when she ask if she has done something to offend her, Anna tersely replies, "no, everything is fine" what should shondra do
Answer:
A. avoid talking to Anna altogether and stay out of her way
B. ask her manager for advice
C. check with Gary to see if there is any gossip about what's going on with Anna
D. take a curt approach of her own to show Anna how it feels
Explanation:
ANSWER: B.
Due to its low-density styrofoam isn't economically feasible to recycle and is becoming a widespread pollutant. Styrofoam is polymerized from which starting molecule?
A. Septane
B. Ethylene
C. Styrene
D. Acetylene
PLS HELP THANK YOU!!!
Answer: Polystyrene (PS) is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum.
Explanation:
What colors are absorbed Best Buy the plant gizmo
Answer:
Yellow and Green
Explanation:
It is not blue the graph shows is isnt blue so the colors that absorbed the worse were green and yellow
Blue and red are the colors that plants can absorb the most. The pigments used for photosynthetic processes, such as chlorophyll in plant cells' chloroplasts, are what absorb particular visible-spectrum light wavelengths.
The energy of specific light wavelengths is absorbed by special pigments in chloroplasts of plant cells, resulting in a chemical chain reaction that is known as the light-dependent process of photosynthesis. The best visible light wavelengths for photosynthesis are in the blue (425–450 nm) and red (600–700 nm) ranges.
Chlorophylls do not absorb light at green and yellow wavelengths, as shown by the extremely low level of light absorption between 500 and 600 nm.
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The reaction with hydrogen with oxygen produces water: 2 H2 + O2 ---> 2H20. How many moles of O2 are required to react with 2.0 mol of H2? *
o2 is made and hydrogen help make it
When two atoms are bonded and have a large difference in electronegativity:
HELP PLEASEEE
Answer:
Second option - The bond is very polar
Explanation:
Electronegativity of an basically refers to the degree at which an electron is able to attract electrons to itself.
There are different types of bonds between atoms, depending on the electronegativity of the atoms.
When there is a large difference in electronegativity, it pretty much means that one atom would draw electrons more than the other. When this happens, the bond is said to be polar because there is uneven distribution of the charges.
The second option is the correct answer in thus question.
Jana is modeling mutations using the word "FRIEND."
Which version of the word "FRIEND' models a deletion mutation?
A FRIENDS
B. DRIEND
C. FIEND
D. DNEIRF
Answer:
It is c I am doing the test I hope this helps ; )
Explanation:
Answer:
c
Explanation:
What is the charge of an electron?
A-negative
B-neutral
C-positive
D-none of these
The recommended dally allowance (RDA) of selenium in your diet is 55 micrograms. how many atoms of selenium is this?
Answer: 4.19 x 10^17 atoms Se
Answer:
4.2 × 10¹⁷ atoms of Se
Explanation:
Step 1: Convert the mass to grams
We will use the conversion factor 1 g = 10⁶ μg.
55 μg × 1 g/10⁶ μg = 5.5 × 10⁻⁵ g
Step 2: Calculate the moles corresponding to 5.5 × 10⁻⁵ g of Se
The molar mass of Se is 78.96 g/mol.
5.5 × 10⁻⁵ g × 1 mol/78.96 g = 7.0 × 10⁻⁷ mol
Step 3: Calculate the atoms in 7.0 × 10⁻⁷ moles of Se
We will use Avogadro's number: there are 6.02 × 10²³ atoms of Se in 1 mole of Se.
7.0 × 10⁻⁷ mol × 6.02 × 10²³ atom/1 mol = 4.2 × 10¹⁷ atom
A 475 cm3 sample of gas at standard temperature and pressure is allowed to expand until it occupies a
volume of 600. cm3. What temperature would be needed to return the gas to standard pressure?
The final temperature : 345 K
Further explanationGiven
475 cm³ initial volume
600 cm³ final volume
Required
The final temperature
Solution
At standard temperature and pressure , T = 273 K and 1 atm
Charles's Law :
When the gas pressure is kept constant, the gas volume is proportional to the temperature
V₁/T₁=V₂/T₂
Input the value :
T₂=(V₂T₁)/V₁
T₂=(600 x 273)/475
T₂=345 K
5. Determine if each statement is true or false about forming a hypothesis:
a. It must be long.
b. It is an educated guess.
c. It is in if…then format.
d. It must be testable.
e. It must start with I think.
Answer:
A: false
B: true
C: false
D: true
E: false
Explanation:
it doesn't necessarily need to be long but if it needs to be an educated guess, it has to be testable because you need to know if your hypothesis is true or not and "it doesn't need to start with "I think ...", it is must better with "if I do this ..." .
The phase that occurs beyond the critical point is:
A. Liquid
B. Solid
C. Gas
D. All of the above
Answer:
C. Gas
Explanation:
A supercritical fluid occurs beyond the temperature of critical point, wherein the state matter transitions from liquid to gaseous phase interchangeably. Whereas, triple point occurs when all three states of matter: solid, liquid nd gas; coexist.
Hence the answer to the question is Gaseous phase/
I hope you found this helpful.
Steel is an alloy that is used in making strong roofs because of its enhanced mechanical and chemical properties. Do you consider steel to be more or less malleable than the elements that make it? Explain your answer. Use in your answer the term lattice energy.
Answer:
Steel is less malleable.
Explanation:
Steel is less malleable than the elements that make it because of the presence of carbon in it. Steel is an alloy of iron and carbon which is harder than iron because of the presence of carbon. Iron in its pure form is softer that able the atoms slip over one another. If carbon is added, they stop the iron atoms from sliding apart so easily. This makes the metal stronger and harder.
Magnesium ions for ionic bonds with fluoride ions in a 1:2 ratio. Explain how electrons are transferred between atoms and how the ionic bonds form in this compound.
I hope this helps......
The combination of all the forces on an object is called?
Answer:
net force
Explanation: