Answer:
18.375 gm left
Explanation:
1/2 ^4 = 1/16th will be left (see the '4' representing 4 half lives?)
294 * 1/16 = 18.375 gm
The common functions of all cells include:
1. Why does cabbage juice have different colors at different pH levels?
2. Would the solution be acidic or basic when cabbage juice is pink?
1:Red cabbage contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base.
2: Basic
all waves, except electromagnetic waves, need a medium to travel through. what is a "medium"? give 2 examples
Answer:
air water
Explanation:
Mediums that can have waves
What is the oxidation number of sulfur in na2s2o3 ?.
Answer:
Therefore, the oxidation state of sulphur atoms in Na2S2O3 is −2 and +6.
2.0 mL of a 0.75 M solution of potassium permanganate , KMnO4 solution is used to make a 500 mL solution . What is the concentration of the new solution ?
The concentration of the new solution is 0.003 M.
How do we calculate the required concentration?Required concentration of the final solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial solution.
M₂ & V₂ are the molarity and volume of final solution.
On putting values from the question, we get
M₂ = (0.75)(2) / (500) = 0.003 M
Hence required concentration is 0.003M.
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The
gas pressure in an oxygen tank is 3.90 atm at a
If temperature of 298 K. If the pressure decreases to 3.20 atm,
what is the temperature of the gas in kelvin?
Answer: …
Explanation:
If brainly deletes one more of my answers when im just answering the question correctly im suing bro
Answer:
The moderators are just there to delete relevant questions or answers but they aren't deleting the spammers .
Explanation:
Stay safe, stay healthy and blessed.
Have a good day !
Thank you
5. Elements are different because they contain different numbers of protons.
Answer:
True
Explanation:
The number of electrons are what determine an atom.
The number of electrons = number of protons
so the elements are different.
If the number of neutrons are different but the number of electrons and protons are same they are of the same element.
But here the number of protons are different so this is another element.
Select the correct answer from each drop-down menu. 2naoh h2so4 → na2so4 h2o the equation is because the number of hydrogen atoms and atoms is in the reactants and in the products.
The equation will balance because the number of hydrogen atoms and atoms is in the reactants and in the products in this case is 2.
How to balance reactions?
Reaction balancing is a method used in several areas of Chemistry to determine the amount of matter of each of the substances participating in the reaction, as well as to establish the existing proportions between the components.
So, since you must have the same amount of sodium and chlorine on each side of the reaction, then you have multiplay the NaCl for 2.
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What is the major defining property of gasses?.
Answer:
Gases have no definite shape or volume. They are fluid, allowing particles/molecules to move freely.
The behavior of a gas is that the volume changes directly with temperature. With a constant volume, the pressure will be directly proportional to the amount of gas.
Explanation:
These are some of the properties I can think of
Please help I do not understand
A model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
What is density?Density is a measure of the compactness of a material.
Density is defined as the ratio of mass to the volume of a substance.
Density = mass/volumeDense materials have tightly packed particles while less dense materials have greater spaces between their particles.
Avogadro's hypothesis applies to substances in gaseous form since they do not have a constant volume.
Therefore, a model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
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WILL GIVE BRAINLIEST! Please help me because I am unable to find help and I have to turn in this assignment or else I will fail this class for the year. I AM NOT ACCEPTING FILES!!
The statement about the number of moles of acid and base being the same is true in the neutralisation reaction between the acid HCl and base NaOH.
What is neutralisation reaction?A neutralisation reaction is the type of chemical reaction whereby an acid reacts with a base to form salt and water.
HCl + NaOH --------> NaCl + H2O
In the neutralisation reaction, between the acid HCl and base NaOH above, the balanced chemical equation showed that the initial number of moles of acid is equal to the final amount of the number of moles of known base which is NaOH.
Therefore, the statement about the number of moles of acid and base being the same is possible in the neutralisation reaction between the acid HCl and base NaOH.
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Jack would probably say his lines with a _______ voice.
A. puzzled
B. delighted
C. whining
A. because he might be in trouble in a play
The equilibrium concentrations for the reaction between N2 and O2 to form NO at a certain temperature are given in the table below. What is the equilibrium constant for the reaction?
A. 42
B. 2.4 x 10^-2
C. 4.2 x 10^-4
D. 21
Answer:
c
Explanation:
c is correct i believe
Which would most likely from a homogeneous mixture
Answer:
Sand would most likely be a homogeneous mixture
How many molecules are in a 45g sample of water?
Answer:
Solution : Number of moles of water `=(" Mass of water ")/(" Gram molecular mass of water ")= (45g)/(18g)= 2.5`. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.Explanation:
Hope It helps uWhich of the following increases air’s ability to hold water vapor? a. increase in wind speed c. decrease in temperature b. increase in temperature d. decrease in air pressure Please select the best answer from the choices provided A B C D
Increase in temperature increases air's ability to hold water vapour. That is option B.
What is water vapour?Water vapor is defined as the form of water when in gaseous state.
Water turns to vapour when heat is added to it leading to evaporation.
Therefore, Increase in temperature increases air's ability to hold water vapour.
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how many neutrons does zinc have
Answer:
The number of protons is 30. Substitute the known values, where N represents the number of neutrons. Let's rewrite the equation as 30+N=65 30 + N = 65 .
Answer:
35 neutrons
Step by step explanation:
Atomic mass of Zinc: 65 amu (atomic mass units)
Number of protons in Zinc: 30
Number of neutrons in Zinc: Atomic mass of Zinc - Number of protons in Zinc = 65-30 = 35 neutrons.
Therefore, zinc atoms have 35 neutrons.
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The weak base ionization
constant (Kb) for HCO3 is
equal to:
Weak bases are alkaline solution that does not get completely dissociated. The dissociation constant will be the ratio of the concentration of the products to the reactants.
What is a weak base ionization constant?The weak base ionization constant is the equilibrium constant that is given as the division of the products of the ionization to the concentration of the reactants.
The reaction for HCO₃ is given as:
HCO₃⁻ + OH⁻ ⇄ CO₃²⁻ + H₂O
The value of Ka for the given reaction will be:
Ka = [CO₃²⁻][H₂O] ÷ [HCO₃⁻ ][OH⁻]
Therefore, the Ka of the weak carbonic acid is given as the ratio of the concentration of the products to the reactants.
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Name the molecule in the picture
Answer:
1,3 - dimenthylbenzene
Right option is (c).
Explanation:
⠀
⠀
As here in the figure, we can see the hexagonal shape with a circle inside it which depicts the benzene ring. And at 1 and 3 carbon atom, the methyl group is attach to the it.
⠀
It's formula will be
[tex] \sf C_8H_{10}[/tex]
It is also known as m-xylene.
⠀
And this organic compound is used in leather and rubber industries.
What does the number at the end of an element mean? (For example, Hydrogen-3)
Answer:
The top number is the total mass number, particles in an atom of an element that have mass are protons and neutrons.
Explanation:
14
Select the correct answer.
The perihelion is the point at which Earth is closest to the Sun, and the aphelion is the point at which Earth is farthest away. Based on this
information, which statement is true?
O A. Earth moves faster along its orbit during perihelion because of the Sun's gravitational force.
O B. Perihelion marks the beginning of summer, when Earth is closest to the Sun.
• C
The longest day of the year occurs during perihelion due to a lunar eclipse.
© D. The Moon rotates faster during perihelion because of Earth's gravitational force.
Answer: B
Explanation: I know
Name these compounds according to IUPAC.
IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.
What is IUPAC?IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.
The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.
Therefore, the compounds are ethane, butane, and butene.
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The electrons between atoms in metallic bonds
allow for bonding metals to be reactive.
allow for bonding metals to be stable.
are stationary and provide durability to the metal.
are attracted to the neutrons of the metal.
Answer:
Metallic bonding is the type of chemical bonding that occurs between atoms of metals. In a metallic bond, atoms share their electrons in a way that allows them to form a “sea” of free electrons. This electron sea is responsible for the unique physical and electrical properties of metals.
Explanation:
Answer:
B. allow for bonding metals to be stable.
Explanation:
edge 2022
how do atoms show both unity and diversity
Answer: As one atomic dipole nears another atom it will affect the electron density distribution, so for example if the slightly positive end of the atom is located next to another atom, it will attract the electron(s) in the other atom. A covalent bond happens when atoms share an electron between them. The other kind of bond is called ionic, and it happens when one atom gives an electron to another atom. These bonds are held together with electric forces. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.
Answer:
there are relatively few atoms but they can make many molecules
Explanation:
What does the big bang theory state
If a substance cannot be separated by physical means or chemical means, it is ___________.
Question 4 options:
an element
a solution
a molecule
a compound
An element is a pure substance that cannot be separated into simpler substances by chemical or physical means
Answer:
It is an element.
Explanation:
chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
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Just look at pic please it has the question and answers
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's balance the given equation ~
[tex]\qquad \sf \dashrightarrow \:S_8 + O_2 \rightarrow SO_3[/tex]
[tex] \textsf{Step 1 - balance Sulphur (S) on both sides} [/tex]
[tex] \textsf{[ By multiplying} [/tex] [tex] \sf{SO_3} [/tex] [tex] \textsf{by 8 on product side ]} [/tex]
[tex]\qquad \sf \dashrightarrow \:S_8 + O_2 \rightarrow 8 \: SO_3[/tex]
[tex] \textsf{Step 2 - balance Oxygen (O) on both sides} [/tex]
[tex] \textsf{[ By multiplying} [/tex] [tex] \sf{O_2} [/tex] [tex] \textsf{by 12 on reactant side ]} [/tex]
[tex]\qquad \sf \dashrightarrow \:S_8 +12 \: O_2 \rightarrow 8 \: SO_3[/tex]
So, we can infer that the Correct choice is D
2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O
In the above equation, how many grams of N2 can be made when 12.2 moles of CuO are consumed?
Answer:
114 grams N₂
Explanation:
To find the answer, you need to (1) convert from moles CuO to moles N₂ (via the mole-to-mole ratio from equation) and then (2) convert from moles to grams (via molar mass from the periodic table). The final answer should have 3 sig figs according to the given value (12.2).
2 NH₃ + 3 CuO --> 3 Cu + 1 N₂ + 3 H₂O
Molar Mass (N₂): 2(14.01 g/mol)
Molar Mass (N₂): 28.02 g/mol
12.2 moles CuO 1 mole N₂ 28.02 grams
----------------------- x ----------------------- x ----------------------- = 114 grams N₂
3 moles CuO 1 mole N₂
How many grams of sodium chlorate(nacio3) are in 1.23 x10^23 representative particles?
Answer:
About 21.7 grams.
Explanation:
To find the mass of a sample of sodium chlorate (NaClO₃) given the amount of particles present, we can convert from particles to moles, and moles to mass using its molecular weight.
The molecular weight of sodium chlorate is:
[tex]\displaystyle \begin{aligned} \mathcal{M}_\text{NaClO$_3$} &= (22.99 + 35.45 + 3(16.00)) \text{ g/mol} \\ \\ & = 106.44\text{ g/mol} \end{aligned}[/tex]
And recall that in one mole of any substance, there are 6.02 × 10²³ of it. Hence:
[tex]\displaystyle \begin{aligned} 1.23\times 10^{23} \text{ NaClO$_3$} &\cdot \frac{1\text{ mol NaClO$_3$}}{6.02\times 10^{23}\text{ NaClO$_3$}} \cdot \frac{106.44\text{ g NaClO$_3$}}{1\text{ mol NaClO$_3$}} \\ \\ &= 21.7 \text{ g NaClO$_3$} \end{aligned}[/tex]
In conclusion, there are about 21.7 grams of sodium chlorate.