Answer:
2 and 4 and 3
Explanation:
in c. leading 0's are never significat. Numbers 1-9 are always significant.
d. leading 0's are never significant. numbers 1-9 are always significant. ending 0's are only significant when there is a decimal.
e. numbers 1-9 are always significant. 0's are not significant because there is no decimal.
One of the light waves produced when hydrogen is energized has a wavelength of 4.105 x10^-7 m. What is the frequency of this light?
Answer:
7.3 x 10¹⁴Hz
Explanation:
Given parameters:
Wavelength = 4.105 x 10⁻⁷m
Unknown:
Frequency of the light =?
Solution:
The frequency, wavelength and speed of a wave are related using the expression below;
C = f λ
C is the speed of light = 3 x 10⁸
f is the frequency
λ is the wavelength
3 x 10⁸ = f x 4.105 x 10⁻⁷
f = [tex]\frac{3 x 10^{8} }{4.105 x 10^{-7} }[/tex] = 7.3 x 10¹⁴Hz
Answer:
7.3 x 10¹⁴Hz
Explanation:
A student found the percent composition of CO to be 50% C and 50% O. What did the student do Incorrectly? What is the percent composition of CO?
What pressure (in atm) does 3.54 moles of chlorine gas at 376 K exert on the walls of its 51.2 L container?
Answer:
2.13 atm
Explanation:
If a(n) ___
ended question is too challenging, respondents will abandon the survey
Answer:
Open ended question
Explanation:
Built different :]
Answer:
if an OPEN end question is too challenging respondents will abandon the surevy
Explanation:
All elements are unstable except the noble gases
True or False
Answer:
True
Explanation:
Noble gases already have the maximum number of valence electrons they can hold so they are the only stable group
name them pls i don't know this
Answer:
Explanation:
1. Sodium
2. Ammonium Carbonate
3. Potassium phosphate
4. Calcium sulphate
5. Zinc nitrate
6. Iron(III) oxide-hydroxide
7. Aluminium phosphate
8.Cobalt(III) Carbonate
9. Iron(II) sulfate
10. Magnesium chloride
11. Nitric acid
Answer:
1. Sodium
2. Ammonium Carbonate
3. Potassium phosphate
4. Calcium sulphate
5. Zinc nitrate
6. Iron(III) oxide-hydroxide
7. Aluminium phosphate
8.Cobalt(III) Carbonate
9. Iron(II) sulfate
10. Magnesium chloride
11. Nitric acid
Explanation:
Describe the structure of sodium metal?
Answer:
The body-centred cubic (bcc) structure is the most stable form for sodium metal at 298 K (25°C). Under normal conditions, all of the Group 1 (alakali metals) elements are based upon the bcc structure. The closest Na-Na separation is 372 pm implying a sodium metallic radius of 186 pm.
Explanation:
Jocelyn and her friends put some raisins, hazelnuts,
almonds, and peanuts in a bowl to make a snack for their
hiking trip. What does this snack represent?
A. a solution
B. a new element
C. a new compound
D. a mixture
plspslsspslpsl help its revision for exam and i need it quick brainliest for the right answer :D
Answer: a mixture
Explanation:
Can someone help me with this?
Answer:
b
Explanation:
it i b ur welcome
Answer: um sure so 2+4= 24 then 9+7=97
Explanation: bc if you have 2 and you have 4 and if you smash that together you get 24 and 9 and 4 smash that together and you get 94 see so easy
Which type of energy produces almost no waste or pollution?
A: burning coal
B: nuclear energy
C: solar energy
Answer:
B: nuclear energy.
Explanation:
It is emission-free and it saves 2.4 billion tons of carbon emissions per year. Also, the level of hazard of nuclear waste does decrease during the time.
Hope that helps!
which element below has the highest electronegativity? beryllium, carbon, fluorine, nitrogen
Answer: fluprine
Hope this help
How do you think the atomic radii will change as electrons are added to a shell?
Answer:
As electrons are added to the valence shell, an extra proton (i.e fundamental, positively charged nuclear particle) is added to the element's nucleus. As electrons add and Z the atomic number increases 1 by 1, nuclear charge WINS, and electronic radii contract.
Explanation:
Hope this helps you
Crown me as brainliest:)
How to balance Kmno4 + H2 So4+ CH3CH2OH-> K2So4+ mnso4 + CH3COOH + H2o by oxidation number method
Answer:
Ethanol + Potassium Permanganate + Sulfuric Acid = Acetic Acid + Manganese(II) Sulfate + Water + Potassium Sulfate
Explanation:
Use the periodic table to select which type of bond is present and which of the listed properties is most likely for each substance.
A =
B =
Cu3Zn2
O2
Answer:
A :metallic
B :conducts electricity as a solid
C :covalent
D :does not conduct electricity
Explanation:
Answer:
A = ✔ metallic
B = ✔ conducts electricity as a solid
C = ✔ covalent
D = ✔ does not conduct electricity
Explanation:
edge 2023
HCOOH + MnO, CO, + Mn2+ (in acidic solution) *
Step 1: Separate the whole reaction into two half-reactions
HCOOH → CO2 MnO4- → Mn2+
Step 2: Balance the non-hydrogen and non-oxygen elements first
HCOOH → CO2 MnO4- → Mn2+
(C is balanced) (Mn is balanced)
Step 3: Balance oxygen by adding H2O(l) to the side that needs oxygen (1 O : 1 H2O)
HCOOH → CO2 MnO4- → Mn2+ + 4H2O
Step 4: Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)
HCOOH → CO2 + 2H+ 8H+ + MnO4- → Mn2+ + 4H2O
Step 5: Balance the charges: add electrons to the more positive side (or less negative side)
HCOOH → CO2 + 2H+ 8H+ + MnO4- → Mn2+ + 4H2O
Reactants Products Reactants Products
HCOOH = 0 2H+ = +2 8H+ =+8 Mn2+ =+2
__MnO4- = -1________________________
Overall = 0 +2 +7 overall = +2
+2e- +5e-
0 +2
Step 6: Balance electrons on the two half-reactions
5[HCOOH → CO2 + 2H+ +2e-]
2[5e- + 8H+ + MnO4- → Mn2+ + 4H2O]
5HCOOH → 5CO2 + 10H+ + 10e-
10e- + 16H+ + 2MnO4- → 2Mn2+ + 8H2O
Step 7: Get the overall reaction by adding the two reaction.
5HCOOH → 5CO2 + 10H+ + 10e-
10e- + 16H+ + 2MnO4- → 2Mn2+ + 8H2O
5HCOOH + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5CO2
Balanced Redox Reaction:
5HCOOH + 6H+ + 2MnO4- → 2Mn2+ + 8H2O + 5CO2
what is the molar mass of ammonium sulfite
Answer: 116.15 g/mol
!PLEASE HELP ASAP!
How many grams of aluminum can be produced by decomposing 12.3 grams of aluminum
oxide?
The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?
No, because they have different masses.
No, because they have different volumes.
Yes, if each sample contains 6.02 x 1023 atoms.
Yes, if each sample contains 2 amu.
Answer:
c: Yes, if each sample contains 6.02 x 1023 atoms.
Explanation:
got it right on the test <3
Yes, if each sample contains 6.022×10²³ atoms. Therefore, the correct option is option C among all the given options.
What is mole?In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, and other predetermined particles. Every material has the same amount of atoms and other particles inside of a mole. The mole has the following relationship to an element's mass: One moles of carbon twelve atoms weighs 12 grammes and has 6.022×10²³ atoms.
In contrast, a mole of oxygen weighs 15.999 grammes despite having the same amount of atoms as a mole of carbon-12 by definition. As a result, oxygen is heavier than carbon. The same logic can be used to determine the weights of molecules or formulas. Yes, if each sample contains 6.022×10²³ atoms.
Therefore, the correct option is option C.
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ7
Which element is in the same family as Chlorine (Cl) and Fluorine (F)?
Hydrogen (H)
Lithium (Li)
Oxygen (O)
Bromine (Br)
Answer/Explanation:
Chlorine and Fluorine are in the Halogen family. The elements in the Halogen family are:
Fluorine (F)
Chlorine (Cl)
Bromine (Br)
Iodine (I)
Astatine (At)
Tennessine (Ts)
Hydrogen (H) is a nonmetal
Oxygen (O) is a nonmetal
Lithium (Li) is an alkaline metal.
Answer/Explanation:
Chlorine and Fluorine are in the Halogen family. The elements in the Halogen family are:
Fluorine (F)
Chlorine (Cl)
Bromine (Br)
Iodine (I)
Astatine (At)
Tennessine (Ts)
Hydrogen (H) is a nonmetal
Oxygen (O) is a nonmetal
Lithium (Li) is an alkaline metal.
Enter 4 digit code( need help!!)
Answer:
9146
Explanation:
Answer:
9146
Explanation:
9146
In addition to Earth, which planet has evidence of water on the surface?
(one Answer)Thank you
Mars
Mercury
Neptune
Saturn
Answer:
mars
Explanation:
just googled it
In addition to Earth, mars planet has evidence of water on the surface.
What are evidence of water?Evidence proves that financing results works Our strong evidence based on the proves that more lives and real can be changed through access to affordable inventing for water and sanitation.
Evidence of finding water on Mars first to be known in 2000, with the appearance of gullies that suggested us about a liquid origin. Their formation has been hotly in debated over the ensuing years.
Therefore, addition to Earth, mars planet has evidence of water on the surface.
Learn more about evidence of water, here:
https://brainly.com/question/3406927
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What is the density of an object with a mass of 140 g and a volume
of 6 ml
Answer:
23.33 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{140}{6} = \frac{70}{3} \\ = 23.3333...[/tex]
We have the final answer as
23.33 g/mLHope this helps you
WILL GIVE BRAINLIEST
Answer:
Explanation:
NaClO3
Atomic masses:
Na =23
Cl=35.5
O=16
Molar mass=(23)+(35.5)+(3×16) =106.5g/mol
What energy transformation occurs in solar panels found on a roof?
Explanation:
Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.
Answer:
Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.
Of the three states of water(ice,liquid, and water vapor), in which state are the intermolecular forces the strongest? In which state are they the weakest
What is the first example in the periodic table where the Aufbau principle is not followed?
the 3s subshell is lower in energy than the 3d subshell
the 3s subshell is lower in energy than the 2p subshell
the 2s subshell is lower in energy than the 2p subshell
the 4s subshell is lower in energy than the 3d subshell
Answer:
the 4s subshell is lower in energy than the 3d subshell
Explanation:
In the element number 24 which is chromium
the electronic configuration should be according to Aufbau principle
will be = [tex]1s^22s^22p^63s^23p^64s^23d^4[/tex]
but in reality it is = [tex]1s^22s^22p^63s^23p^64s^13d^5[/tex]
The 6 electrons in the outermost shell will be divided as 5 in 3d subshell and 1 in 4s shell, because half filled orbital [tex]4s^13d^5[/tex] will be more stable than [tex]4s^23d^4[/tex].
Magnesium will...
• Gain 2 electrons and become Mg2-
• Lose 2 electrons and become Mg2-
• Gain 2 electrons and become Mg2+
• Lose 2 electrons and become Mg2+
Answer:
D
Explanation:
magnesium always lose 2 electrons
Hello can someone help me out i will give brainliest.. chemical or physical change hwwwww
Answer:
11. physical
19. chemical
10. chemical
12. physical
18. chemical
Explanation:
that should be right, I'm not exactly sure though
calculate the wavelength of a photon of green light that has a frequency (v) of 5.76x10^14 s^-1
Answer:
λ = 521nm
Explanation:
To convert wavelength to frequency we need to use the equation:
ν = c / λ
Where ν is frequency: 5.76x10¹⁴s⁻¹;
c is speed of light: 3x10⁸ms⁻¹;
And λ is wavelength in m:
Wavelength is:
λ = c / ν
λ = 3x10⁸ms⁻¹ / 5.76x10¹⁴s⁻¹
λ = 5.21x10⁻⁷m
= 521nm
The wavelength of a photon of green light that has a frequency (v) of 5.76x10¹⁴ s-¹ is 5.21 × 10-⁷m
HOW TO CALCULATE WAVELENGTH:
The wavelength of a photon can be calculated by using the formula below:λ = v/f
Where;
λ = wavelength of the photon (m)v = velocity (3 × 10⁸ m/s)v = frequency of photon (s-¹)According to this question, the frequency (v) of a greenlight is 5.76x10¹⁴ s-¹, the wavelength can be calculated as follows:λ = 3 × 10⁸ ÷ 5.76 x 10¹⁴
λ = 3/5.76 × 10⁸-¹⁴
λ = 0.521 × 10-⁶
λ = 5.21 × 10-⁷m
Therefore, the wavelength of a photon of green light that has a frequency (v) of 5.76x10¹⁴ s-¹ is 5.21 × 10-⁷m.Learn more at: https://brainly.com/question/19601903?referrer=searchResults
what is the mass in grams of 0.00125 mole of sodium Na=23
Answer:
0.03g
Explanation:
Given parameters:
Number of moles of Na = 0.00125mole
Unknown:
Mass in grams of Na = ?
Solution:
To find the mass of this substance, we simply multiply the number of moles with the given molar mass of Na.
Mass of Na = number of moles x molar mass
Mass of Na = 0.00125 x 23 = 0.03g