1.37 × 10⁻²¹ mol C
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
825 atoms C
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 825 \ atoms \ C(\frac{1 \ mol \ C}{6.022 \cdot 10^{23} \ atoms \ C} )[/tex] = 1.36998 × 10⁻²¹ mol C
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.36998 × 10⁻²¹ mol C ≈ 1.37 × 10⁻²¹ mol C
If C6H6 was the molecular formula, what is the empirical formula?
Answer:
so the empirical formula for benzene is also CH.
Explanation:
HELPP ASAP PLEASE SEE IMAGES
Answer:
1st paragraph:
1.compound 2.physical 3.elements 4.water 5. gas 6.white 7. season 8.ratio 9.formula 10.elements 11.atoms 12.subscript 13.one
2nd paragraph
1.stable 2.many/reactive 3.eight 4.helium 5.seven 6.outer 7.one 8.level 9. compounds 10.reactive 11. seven 12. Eight 13.lose 14.gain 15. Share 16.compounds 17. atoms
Explanation:
I just did the 1st page. Gimme a min and I'll do the second.
calculate the number of atom of each element :
Answer:
P = 6
O = 15
Explanation:
for the phosphorus you multiply the mole number which number of atom present, same thing applicable to the oxygen atom
I need help tutor it is hard
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The atomic symbol represents the _____ of the element.
Protons
Explanation: the atomic number is the same as the number of protons
How do I know if something is either a nonpolar or polar substance?
Answer:Read explanation
Explanation:
A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. A non polar substance we be the opposite of what I said
A student heats a LaTeX: 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) to CaO(s) + CO2(g)
Select one:
a) 1.4 g CaO
b)2.1 g CaO
c)2.5 g CaO
d)1.0 g CaO
Answer:
2.5
Explanation:
Help ASAP give brainest if right And please hurry
Answer:
Conduction
Convention
Radiation
in that order
Answer:
Conduction
Convention
Radiation
Explanation:
What kind of material will reduce the flow of heat energy?
What is the wavelength of a wave with energy equal to 1.528 x 10-13 J? E=hc/LaTeX: \lambdaλ Energy= Measured in Joules h=Plank's constant, 6.626 x 10-34 J x s c=speed of light, 3.00 x108 m/s LaTeX: \lambdaλ= wavelength in meters Group of answer choices 1.301 x 1029 m 6.918 x 1028m 6.918 x 10-13m 1.301 x 10-12m
Answer:
1.301 × 10⁻¹² m
Explanation:
Step 1: Given and required data
Energy of the electromagnetic wave (E): 1.528 × 10⁻¹³ JPlanck's constant (h): 6.626 × 10⁻³⁴ J . sSpeed of light (c): 3.00 × 10⁸ m/sStep 2: Calculate the wavelength (λ) of the electromagnetic wave
We can calculate the wavelength of the electromagnetic wave using the Planck-Einstein's relation.
E = h × c / λ
λ = h × c / E
λ = (6.626 × 10⁻³⁴ J . s) × (3.00 × 10⁸ m/s) / 1.528 × 10⁻¹³ J
λ = 1.301 × 10⁻¹² m
The wavelength of this wave is equal to: D. [tex]1.301 \times 10^{-12}\;meter[/tex]
Given the following data:
Energy = [tex]1.528 \times 10^{-13} \;Joules[/tex]Plank's constant = [tex]6.626 \times 10^{-34}\;Js[/tex]Speed of light = [tex]3 \times 10^8\;m/s[/tex]To determine the wavelength of this wave, we would apply Einstein's equation for photon energy:
Mathematically, Einstein's equation for photon energy is given by the formula:
[tex]E=\frac{hc}{\lambda}[/tex]
Where:
E is the energy. h is Plank's constant.[tex]\lambda[/tex] is the wavelength.c is the speed of light.Making [tex]\lambda[/tex] the subject of formula, we have:
[tex]\lambda = \frac{hc}{E}[/tex]
Substituting the given parameters into the formula, we have;
[tex]\lambda = \frac{6.626 \times 10^{-34}\; \times \;3.0 \times 10^{8}}{1.528 \times 10^{-13} }\\\\\lambda = \frac{1.99 \times 10^{-25}}{1.528 \times 10^{-13} }\\\\\lambda =1.301 \times 10^{-12}\;meter[/tex]
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4.
How does a positive ion form?
Answer: Metal atoms lose electrons from their outer shell when they form ions: the ions formed are positive, because they have more protons than electrons.
please help. thank you!
Find an interesting chemical reaction. It can be a simple one but please have some facts and info about it. Thank you!
Answer:
Elephant Toothpaste
When hydrogen peroxide and potassium iodide are mixed in proper proportions, the hydrogen peroxide decomposes very quickly.The soapy water traps the oxygen, a product of the reaction, and creates many bubbles. Foam is a kind of a mixture called a colloid - gas bubbles in a liquid.It produces foam but it also can produce heat.Extra
Make Elephant Toothpaste
Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you won't mind getting wet foam everywhere.
In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about five minutes to activate before proceeding to the next step.
When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast.
I don't know if this will help but here you go.
Which of the following reactions would result in increased entropy?
Answer:
A option
Explanation:
Because recatants are in solid form having less enetropy and products are liquid form having more entropy
While other options reactants and products are in same phase gas phase having same entropy
The reaction that would result in increased entropy is the combustion reaction;
KNO3(s)--->K+(aq)+NO3-(aq). Option A
This is further explained below
What is a combustion reaction?Generally, a combustion reaction is simply a combustion process that occurs when a material combines with oxygen gas, producing energy as light and heat.
In conclusion, the chemical reaction KNO3(s)--->K+(aq)+NO3-(aq) is has all properties of a combustion reaction as the solid reactants gives an aq solution.
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What is the medium of the wave shown in the paragraph?
Answer:
The water is the medium of the wave
why is carbon dioxide a green house gas
Answer:
That's because the glass walls of the greenhouse trap the Sun's heat. The greenhouse effect works much the same way on Earth.
Explanation:
Gases in the atmosphere, such as carbon dioxide, trap heat just like the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases.
What mass of Ca(OH)2 would you need to make 300.0mL of a 1.2M solution of Ca(OH)2
Answer:
is there a picture.....????
when will condensation occur?
A. When the humidity equals the relative humidity
B. When sublimation does not occur
C. When the relative humidity drops below 50 percent
D. When the temperature drops below the dew point
Answer:
d
Explanation:
chemical formula for tin iv carbide
Answer:
Explanation:
Sn(WC)2
if it is tungsten carbide this should be correct but there are many versions of carbide
Sn(MC2)2
could also be possible
the 2 next to MC should be a subscript
Balance these equations!
1)
AIBr; +
K-
KBr +
AI
Answer:
Instructions on balancing chemical equations:
Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.
Example: Fe{3+} + I{-} = Fe{2+} + I2
Substitute immutable groups in chemical compounds to avoid ambiguity.
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,
but PhC2H5 + O2 = PhOH + CO2 + H2O will
Compound states [like (s) (aq) or (g)] are not required.
If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.
Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reage
Explanation:
How is light energy converted to chemical energy?
Answer:
Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.
Explanation:
Answer:
Photosynthesis is the process in which light energy
Explanation:
When water is heated a physical change occurs and it forms steam. When a lighted splint is applied to hydrogen gas, a chemical change occurs producing water in the form of steam. Explain how these two statements show two differences between physical and chemical changes.
Answer:
- A new substance was formed in the chemical change while no be substance was formed in the physical change
- The chemical change involved a change in chemical composition while the physical change involved no change in chemical composition
Please find the explanation below.
Explanation:
A physical change is a change that does not alter the chemical content of the substances involved, hence, no new substances are produced while a chemical change alters the chemical composition, hence, new substances results.
In this question,
- Water is heated till it forms steam is characterized as a physical change
- Lighted splint is applied to hydrogen gas to produce water in the form of steam is characterized as a chemical change.
- The first process is a PHYSICAL CHANGE because it involved only a change of state i.e. from liquid to gas, hence, no alteration to the chemical composition of the molecule and also no new substance is produced.
- The second process is a CHEMICAL CHANGE because there was a chemical combination of hydrogen gas and the oxygen in the lighted splint to yield water molecules ( a new substance). Therefore, it involved a chemical reaction and formation of a new substance
Which type of radiological technology is useful for viewing tumors?
Answer:
CT Scan
Explanation:
Radiology is a branch of medicine that uses imaging technology to diagnose and treat disease. So, an example of a radiology technology that is useful for viewing tumors is Computed Tomography (CT)Scan. Others include Magnetic resonance imaging (MRI), X-rays etc.
(HELP PLEASE )A solid is being cooled down.
What is happening to the particles of the solid?
Answer: the vibration becomes faster
Explanation:
types of hardness water
Answer:
A water repellent protein that divides into hard and soft types
Make up your own story using as many elements as you can. Rather than writing the name of the element in your story, use its chemical symbol.
Answer:
Once upon a time, H2O was falling down majestically into the river below the large, strong mountains filled with Ti while a little Au hunter walked to search another long day for his hopeful treasures.
Explanation:
Hope this helps, I don't know how long it's supposed to be soooo, yeah
Which of the following is an example of a chemical property?
a. color
b. density
c. phase
d. the ability to rust
What unit is mass generally measured in
Answer:
kilograms
Explanation:
hope this helps, pls mark brainliest :D
Answer:kilogram
Explanation:
I got the smarts
Choose the COEFFICIENTS that balance the equation by the inspection method.
Answer:
somebody please help her or him please please
Calculate the molarity of a solution prepared by dissolving 2.50 mol of KCl into 2.00 L of solution.
________ M
Answer:
1.25 M
Explanation:
The molarity is found dividing the moles of solute by the litres of solution.
2.50 mol ÷ 2 L = 1.25 M
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the molarity of a solution prepared by dissolving 2.50mol of KCl into 2.00 L of solution is 1.25 M.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in liter
number of moles of solute KCl= 2.50 mol
volume of solution in litre = 2.00 L
substituting all the given values in the above equation, we get
Molarity= 2.50 mol ÷ 2 L
Molarity = 1.25 M
Therefore, the molarity of a solution prepared by dissolving 2.50mol of KCl into 2.00 L of solution is 1.25 M.
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All atoms are positively charged, with the number of protons exceeding the number of electrons. negatively charged, with the number of electrons exceeding the number of protons. neutral, with the number of protons equaling the number of electrons.
Answer:
Yah, it's true.
because protons are represented as helium (²4He) which are positive.
electrons are represented as 0-1e which is negative