Answer:
Ths is question uncompleted!
HELP help HELP!!!! Me ME me
Determine the number of atoms of O in 58.3 moles of Na₂Cr₂O₇.
Answer:
2457.58×10²³ atoms of oxygen
Explanation:
Given data:
Number of moles of Na₂Cr₂O₇ = 58.3 mol
Number of atoms of oxygen = ?
Solution:
First of all we will calculate the number of moles of oxygen in 58.3 moles of Na₂Cr₂O₇.
1 mole of Na₂Cr₂O₇ contain 7 moles of oxygen.
58.3 mol × 7 = 408.1 mol
Number of atoms of oxygen:
1 mole contain 6.022×10²³ atoms
408.1 mol × 6.022×10²³ atoms / 1 mol
2457.58×10²³ atoms
Calculate the volume of 42.0g of tin (density 7.29g/ml)
Calculate the mass of 48 ml of lead (density 11.34g/ml)
Calculate the density of 25.0ml of concentrated hydrochloric acid weighs 34.25g
( I NEED ANSWERS!!!
Answer:
try to calcutlae on paper
Explanation:
try to calculate on paper
GRADE 5 SCIENCE MYA-2020-2021 Question: 1-9
Mi Poweit is demonstrating the water byde. He shapes mountains out of clay on one end of a glass aquarium to represent land. He then pours some water into the aquarium and places a glass lid on it. Next, he turns on a lamp
above them and finally, he places a container tilled with ice on the glass id. In this model, which choice correctly identifies evidence of condensation?
water droplets talling on the day
war in the bottom of the warm
watering from the clay into the water
waterforming on the id under the container
Answer:
water droplets falling on the clay
Explanation:
i finished this test and it was the right answer so lol
Where did the zebra mussels originally come from?
Answer:
he ocean
Explanation:
They are sea cretures who origanly lived in water (or near i forgot)
in a 35.0 L tank of N2O3 at STP, how many molecules are there?
Answer:
[tex]9.40x10^{23}molecules[/tex]
Explanation:
Hello!
In this case, since we are given the volume of N2O3 and pressure and temperature for the STP (1.00 atm and 273.15 K), we can compute the moles, considering the ideal gas equation as shown below:
[tex]PV=nRT\\\\n=\frac{PV}{RT} \\\\n=\frac{1atm*35L}{0.08206\frac{atm*L}{mol*K}*273.15K}\\\\n=1.56mol[/tex]
Now, by using the Avogadro's number it is possible to compute the molecules of this case in 1.56 moles:
[tex]molecules=1.56mol*\frac{6.022x10^{23}}{1mol} =9.40x10^{23}molecules[/tex]
Best regards!
Determine the [OH-] concentration of a 0.123 M Sr(OH)2 solution at 25°C
Answer:
0.246M
Explanation:
0.123M x 2 = 0.246M
Due to Sr(OH)2 has the coefficient of 2.
The [OH⁻] concentration for 0.123 M Sr(OH)₂ solution at 25°C is 0.246M
What is Concentration ?The amount of a solution's solute to either the solvent or the entire solution is called Concentration.
The most common way to express concentration is in terms of mass per unit volume.
The solute concentration, on the other hand, can be expressed in moles or units of volume.
We assume
Sr(OH)2 is a strong base, such that
Sr(OH)₂(s) + H₂O(l) −−−→Sr²⁺(aq)+2OH⁻aq)
The [OH⁻] concentration for 0.123 M Sr(OH)₂ solution at 25°C
= 2 * 0.123
= 0.246 M
As two [OH⁻] are being produced by Sr(OH)₂ .
The [OH⁻] concentration for 0.123 M Sr(OH)₂ solution at 25°C is 0.246M.
To know more about Concentration
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what is a wave in science
(no plagiarism please)
Answer:
something that travels through a medium, transporting energy from one location to another location without transporting matter.
Explanation:
Answer:
A wave is a disturbance that moves energy from one to place to onother
i hope i can help
Jesim wants to help Nancy understand the movement that happens during one Earth year, Jassim holds a small globe representing Earth, and Nancy holds a large ball representing the Sun. What should Jessim do to show
Nancy what happens during one Earth year?
Jessim should not move except to slowly spin the globe
Jesim should slowly spin the globe and walk away from Nancy
Jessim should have Nancy walk around him while spinning the ball
Jessim should spin the globe quickly while walking in a circle around Nancy
Answer:
The answer is D jessim should spin the glove quickly while walking in a circle around nancy.
Explanation:
which of the following uses mechanical energy to function?
A. computer
B. battery
C. microwave oven
D. windmill
PLEASE PLEASE HELP ASAP!
Answer:
Q = 146.25 J
Explanation:
Given that,
The mass of 10 copper pennis = 25 grams
It warm up from 23°C to 38°C.
The specific heat capacity of copper is 0.39 J/g°C
We need to find the energy absorbed by the pennies. The expression for the energy absorbed is given by :
[tex]Q=mc\Delta T\\\\Q=25\times 0.39\times (38-23)\\\\Q=146.25\ J[/tex]
So, 146.25 J of energy is absorbed by the pennies. Hence, this is the required solution.
A pure sample of gold has a volume of 25.0 cm3 and a mass of 483 g. What is the density of gold?
Answer:
19.4 g/cm^3
Explanation:
Which phrase best describes an apple?
a. heterogeneous mixture
b. homogeneous compound
c. heterogeneous substance
d. homogeneous mixture
In a reaction process a company expected to make 6.8
tonnes of ammonia but the yield of ammonia was
only 4.2 tonnes. Calculate the percentage yield of
ammonia.
1
61.8 %
2
0.6 %
3
16.2%
4
6.2 %
Answer:
1) 61.8%
Explanation:
(4.2/6.8)*100
The__is the source of energy used in photosynthesis?
A. Sun
B. Radiant energy
C. Chemical energy
If you can help I would really appreciate it!:)
Answer:
sun
Explanation:
source means where it comes from and the source of energy comes from the sun
Hey
here to help and to serve
Answer:
lol thx
Explanation:
Which of the following statements best describes a limiting reactant? (5 points)
Answer:
The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. From the reaction stoichiometry, the exact amount of reactant needed to react with another element can be calculated.
Explanation:
The Reactant That Limits The Rate (or Speed) Of A Chemical Reaction. The Reactant That Can Produce The Greatest Amount Of Product.
The reactant that is used up before the others best describes a limiting reactant.
What is reactant?Reactant is a starting material in a chemical reaction.
What is limiting reactant?A limiting reactant is the reactant that is used up first and prevents more product from being made. When the limiting reactants are completely used up, then the reaction stops and no further products will be produced.Hence, the reactant that are used up before the others best describes a limiting reactant.
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__C + __H2O → __CO + H2
Answer:
It is balanced
Explanation:
There is 1 Carbon, 2 Hydrogen, and 1 Oxygen on the right and 1 Carbon, 1 Oxygen and 2 Hydrogen on the left. This equation is balanced.
which gas is produced when limestone react with hydrochloric acid
Answer:
gas X
Explanation:
Focus Question
Q: How can you light two
bulbs brightly with one D-
cell?
PLEASE HELP!
Answer:
A D-cell is a source of electric energy. A bulb is an energy receiver that produces light. To make a complete circuit, electricity must travel in a circle from one end of the battery to the other.
Explanation:
Explain what is a chemical reaction.
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
Answer:
a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
Here's an example. When you burn wood, It releases Carbon dioxide, water vapor, and ashes. It just depends what chemicals you use ^^
What is the molar mass of ferric acetate, Fe(C,H,O2),?
Answer/Explanation:
193.96 g/mol
How much energy is required to heat up a Styrofoam cup from 25oC to 40oC? The mass of the cup is 20 grams and the specific heat capacity of Styrofoam is 1.1 J/(g *oC). Group of answer choices
Answer:
[tex]Q=330J[/tex]
Explanation:
Hello!
In this case, since the energy involved during a heating process is calculated as shown below:
[tex]Q=mC(T_2-T_1)[/tex]
Whereas we consider the mass, heat capacity and temperature; we are able to plug in the given data to obtain:
[tex]Q = 20g*1.1\frac{J}{g\°C}(40\°C-25\°C)\\\\Q = 330J[/tex]
Best regards!
Crystal needs more protein in her diet. Which food sources will best provide the building blocks she needs?
100 POINTS AND BRAINLIEST FOR HELP
Write a paragraph that explains diffusion and osmosis and how it relates to the circulatory system. Each sentence should be typed in the appropriate color.
It should include an introductory sentence that restates the question. A sentence that explains diffusion. A sentence that explains osmosis and at least 2-3 sentences that explain the relationship between diffusion, osmosis and the circulatory system. And, lastly, a conclusion sentence.
Materials are transferred between individual cells and their internal environment through the cell membrane by diffusion, osmosis, and active transport. During diffusion and osmosis, molecules move from a higher concentration to a lower concentration. Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. This would be the diffusion.
The breaks of a car use 1200 KJ of energy when applied. Half of the mechanical energy of the brakes is transformed to the wheels, while the other half is wasted, release into the environment in the form of heat. How much energy goes toward braking? Thank you, I am having difficulties with this question
Explanation:
half is wasted, release into the environment in the form of heat.
1.Chlorobenzene, C6H5Cl, is used in the production of chemicals such as aspirin and dyes. One way that chlorobenzene is prepared is by reacting benzene, C6H6, with chlorine gas according to the following BALANCED equation.
C6H6 (l) + Cl2 (g) C6H5Cl (s) + HCl (g)a.
What is the theoretical yield if 45.6 g of benzene react?
Answer:
[tex]m_{C_6H_5Cl}=65.7gC_6H_5Cl[/tex]
Explanation:
Hello!
In this case, according to the given balanced chemical reaction:
[tex]C_6H_6 (l) + Cl_2 (g) \rightarrow C_6H_5Cl (s) + HCl (g)[/tex]
We can see there is 1:1 between benzene and chlorobenzene as the relavant product; thus, since the molar mass of benzene is 78.11 g/mol and that of chlorobenzene is 112.55 g/mol, the theoretical yield for this reaction turns out:
[tex]m_{C_6H_5Cl}=45.6gC_6H_6*\frac{1molC_6H_6}{78.11gC_6H_6 }*\frac{1molC_6H_5Cl}{1molC_6H_6}*\frac{112.55gC_6H_5Cl}{1molC_6H_5Cl} \\\\m_{C_6H_5Cl}=65.7gC_6H_5Cl[/tex]
Best regards!
Balance the following chemical reaction: _NaOH + _H2SO4 ----->_Na2SO4 +_H20
Already balanced.
NaOH + 2H2SO4 ----> 2 Na2SO4 + H2O
2 NaOH + H2SO4 ----> Na2SO4 + 2H2O
2 NaOH + 2 H2S04 -----> 2 Na2SO4 + 2 H20
Answer:
Sodium Hydroxide + Sulfuric Acid = Sodium Sulfate + Water
2NaOH + H2SO4 → Na2SO4 + 2H2O
Explanation:
To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above.
Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
Ionic charges are not yet supported and will be ignored.
Replace immutable groups in compounds to avoid ambiguity. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will.
Compound states [like (s) (aq) or (g)] are not required.
You can use parenthesis () or brackets [].
Which of the following chemical formulas show three molecules of a compound that has one
NEED FAST
atom of mercury and two atoms of bromine
1. 3Mc2Br
2. Hg3Br2
3. 3McBr2
4.McBr23
5.3HgBr2
6.3Hg2Br
The chemical formula : 3HgBr₂(Mercury(II) bromide)
Further explanationGiven
The chemical formulas of Mercury and Bromine
Required
The appropriate chemical formula
Solution
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
The number of molecules is determined by the coefficient in front of the compound
the number of atoms is determined by the subscript after the atom and the coefficient
Three molecules⇒ coefficient = 3
one atom of Mercury ⇒Hg
two atoms of Bromine ⇒ Br₂
The chemical formula : 3HgBr₂
When a substance changes from solid to liquid form, the bonds between the particles become
stronger.
True
False
Answer:True
Explanation:
Answer:
False
Explanation:
Its false, the bonds become weaker.