Answer:
B - Law of Conservation of Mass
Explanation:
was the right answer for me
Halogens are the Group elements. They are highly
reactive and have
in their outer shell. They
become
when they gain an electron from a
metal. The resulting compound is a
Halogens can
also share electrons to form
compounds.
Answer:
Group 17/VIIA
Highly reactive
7 electrons in their outer shell
They become stable and have noble gas configurations when they gain one more electron from metal
Explanation:
halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
Due to their high effective nuclear charge, halogens are highly electronegative. Therefore, they are highly reactive and can gain an electron through reaction with other elements.
Halogens are very reactive because they have seven valence electrons and need one more to have eight valence electrons (an octet). They react with metals and other halogens to get an octet. When this happens, the atoms become stable and have noble gas configurations.
What is the total mass of products formed when 50. 0 grams of CH4 is burned with excess oxygen? CH4 + 2 O2 → CO2 + 2 H2O
10. If 200 mL of gas weighs 0.344 grams at STP, what is its molecular mass? (1000 mL = 1 L)
The molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol. Details on how to calculate molecular mass can be found below.
How to calculate molecular mass?The molecular mass of a gas can be calculated by using the following expression:
At STP, the gas weighs 0.344 grams. volume = 200mL = 0.2LMolecular weight of the gas = mass × volume at STP (22.4L)/ volume of gas
= 0.344 × 22.4/0.2
= 7.7056/0.2
= 38.53g/mol
Therefore, the molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol.
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two cartons of milk were opened , one was left by a radiator while the other was placed in the fridge. how will the milk in the two cartons differ after three days ?
i’m sugar water sugar is the solution, solvent, or solute
and water is the solution, solvent, or solute
Answer:
Sugar is the solute and water is the solvent.
how do substances change from one state to another
Answer:
substances change from one state to another if energy is added or taken away
A 24.0 g sample of iron
was heated from 0°C
to 35.0°C. It absorbed
4087.4 J of energy as
heat. What
is the specific heat of
this piece of iron?
Round to the nearest
whole number.
Answer: 5
Explanation:
What is the equilibrium constant, K, for the following reaction, if the concentration of N2 was measured to be 0.521 M, H2 was measured to be 0.482 M, and NH3 was measured to be 3.17 M
The equilibrium constant is the relation between the products and the reactants of the reaction. The K, for the reaction, is 172.
What is the equilibrium constant?The equilibrium constant (K) is the relationship in the form of a ratio that denotes the concentration of the products to the reactants in a reaction.
The balanced chemical reaction is shown as,
[tex]\rm N_{2}(g) + 3H_{2}(g) \leftrightharpoons 2NH_{3}(g)[/tex]
Given,
Concentration of nitrogen =0.521 M
Concentration of hydrogen = 0.482 M
Concentration of ammonia = 3.17 M
The value of K is calculated as:
[tex]\begin{aligned} \rm K &= \rm \dfrac{[NH_{3}]^{2}}{[N_{2}][H_{2}]^3}\\\\&= \dfrac{(3.17)^{2}}{(0.521)(0.482)^{3}}\\\\&= 172\end{aligned}[/tex]
Therefore, the equilibrium constant for the reaction is 172.
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state two criteria for determining the purity of a substance
Answer:
boiling point and melting point
Explanation:
the difference of the boiling point and the condensation temperature
Three elements, x, y, and z, have consecutive increasing atomic numbers. If element x is a noble gas, what will be the symbol for the ion of element z in its compounds?.
Dominic made the table below to organize his notes about mixtures. A 1-column table. The first column labeled properties of mixtures has entries has no set composition, must have more than one state of matter, must have more than one substance. What mistake did Dominic make? The title should read “Properties of Solutions” because some mixtures do not have all of the properties listed. There is a definite recipe to make each mixture, so the composition of a mixture is set. Although it is possible to have more than one state, it is also possible to have only one state. A single substance can be used to make a mixture if the substance is composed of more than one element.
Answer:
although it is possible to have more than one state, it is also possible to have only one state
Which indicator is yellow in a solution with a ph of 9. 8.
Answer:
methyl orange
Explanation:
i hope i hrlped you
A fossil bone has 25% of radioactive parent isotope remaining. How many half-lives have passed
Answer: 10 half-lives have passed.
Explanation:
A compound is formed when the
atoms that combine to make a
molecule are different elements.
H₂O Is a COMPOUND a pure or
non-pure substance?
Answer:
Atoms combine to form compound for the sake of stability . Atoms either share electrons and form covalent bond or there is unequal distribution of electrons between atom, so ionic bond is formed
How many milliliters of an aqueous solution of 0.210 M calcium acetate is needed to obtain 13.4 grams of the salt?
Explanation:
0,147 mol of CuBr2 equil 224 g/mol x 0.147 mol =33 gram
In 1 L solution dissolved 33 g of salt, but we want to get 13.9 g of salt
therefore, 13.9 g will be in the aqueous solution of volume 0.42 L or 420 mL
( 13.9 / 33 = 0.42 L)
i neeeeed help now !!!!!!!!!!!!!!!!!!!
Answer:
D
Explanation:
If a substance contains a hydrogen ion concentration of 1.0 x 10-5 M, which types of ions does it contain more of?
A) hydroxyl ions
B) oxygen ions
C) hydroxide ions
D) hydrogen ions
Since the pH of the substance is 5, the substance contains more of hydrogen ions.
What is pH of a solution?The pH of a a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.
[tex]pH = -log[H^{+}][/tex]
A neural solution has pH 7.
A solution with pH below 7 has more hydrogen ions while a solution with pH above 7 has more hydroxide ions.
The pH of a substance contains a hydrogen ion concentration of 1.0 x 10-5 M is 5.
Therefore, the substance contains more of hydrogen ions.
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Can someone please help me?
Answer:
c i think
Explanation:
Which elements are present in the compound aluminium nitrate?
Answer:
Aluminum nitrate is a salt composed of aluminum and nitric acid, belonging to a group of reactive chemicals - organic nitrate and nitrite compounds. The nitrate ion is polyatomic, meaning it is composed of two or more ions that are covalently bonded. This ion makes up the conjugate base of nitric acid.
Explanation:
Answer:
Aluminum nitrate: Is a salt composed of aluminum and nitric acid. Making this belong to a group of reactive chemicals which is an organic nitrate and nitrite compounds. The nitrate ion is polymaic. Polymaic means it is composed of two or more ions that are covalently bonded.
Explanation:
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Have A Great Day
~Zero~
Predict what would happen to the strength of the electromagnet in each situation. using a battery with a higher voltage: wrapping the wire around the nail only three times: changing the direction of the current by reversing the battery connections: using a plastic stick in place of the iron nail: holding the nail vertically rather than horizontally:
The the strength of an electromagnet varies with the quantity and direction of current as well as the number of turns in the coil.
What as is an electromagnet?An electromagnet is a material which operates by the principle of electromagnetism.
Electromagnets possesses both electrical and magnetic properties.
The strength of an electromagnet is affected by the current, the number of turns as well as the material of the electromagnet.
The strength of the given electromagnet will be affected thus:
increases when using a battery with a higher voltagedecreases when wrapping the wire around the nail only three timesis unchanged when changing the direction of the current by reversing the battery connectionsdecreases when using a plastic stick in place of the iron nailis greatest when holding the nail vertically rather than horizontally.Therefore, the strength of an electromagnet is affected by current and number of turns in the coil.
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Answer:
Using a battery with a higher voltage:
✔ stronger force of attraction
Wrapping the wire around the nail only three times:
✔ weaker force of attraction
Changing the direction of the current by reversing the battery connections:
✔ no change
Using a plastic stick in place of the iron nail:
✔ weaker force of attraction
Holding the nail vertically rather than horizontally:
✔ no change
Explanation:
Did it in edge 2023 with effort
What does it mean to classify?
1.to put books in alphabetical order
2.to separate objects or ideas into groups based on ways they are alike
3.to separate stamps by year and then by color
4.to organize music by category and then by title
Answer:
2
Explanation:
to separate objects or ideas into group based on ways they are alike
Percent Composition and Determining Empirical And Molecular Formulas
PERCENT COMPOSITION
Determine the percent composition of each of the compounds below.
1. HCl
Answer:
% comp. H = 2.8%, % comp. Cl = 97.2%
Explanation:
HCl mass = mass of H + mass of Cl
HCL mass = 1.00794 + 35.453 = 36.46094
% comp. of H = 1.007694 / 36.46094 x 100 = around 2.8% (2.76376308455)
% comp. of Cl = 35.453 / 36.46094 x 100 = around 97.2% (97.2355622208)
As a rock falls, some of its potential energy is transformed into kinetic energy. What is true about the mechanical energy during this transformation?
A.
It decreases because potential energy is a kind of mechanical energy.
B.
It does not change because kinetic energy and potential energy are both kinds of mechanical energy.
C.
It increases because kinetic energy is a kind of mechanical energy.
D.
It does not change because kinetic energy and potential energy are not kinds of mechanical energy.
Answer:
a or b
Explanation:
because those are the most likely to be true
now it gives you two options so i thinks it might be B but you could choose A you got two options choose wisely
Scientists used to believe that chemical reactions fueled the sun. Why did this lead them to believe that the sun was very young? What kind of reactions do we now think are responsible for the energy released by the sun?
Answer:
The energy produced by the sun is as a result of nuclear reactions which produces large amounts of energy.
Explanation:
Chemical reactions are reactions which occur as a result of a rearrangement of atoms of elements to form new combinations of substances known as compounds.
Since chemical reactions which have relatively short lifespans, scientist would have assumed that the sun is very young.
However, nuclear reactions have been proven to be the means by which the sun produces its energy.
Nuclear reactions release large amounts of energy and have relatively long lifespans.
Therefore, the energy produced by the sun is as a result of nuclear reactions.
We already know that the Sun emits energy through a process called nuclear fusion. Nuclear fusion can occur when the protons of hydrogen atoms collide in the Sun's core to make helium atoms. This can also be called PP, or proton-proton chain reaction. Our Sun is currently 4.6 billion years old, but early scientists believed the Sun to have been made when a huge cloud of gas and particles (also known as a nebula) collapsed under the force of its own gravity. This is known as the Nebula Theory.
Look at the electrophoresis sample below. Which DNA samples are the
most similar (A-F)? What could these similarities mean?
If Band 8 in Sample F represents the mutated gene that causes baldness,
which other DNA samples may also have the baldness gene?
PLEASE HELP WILL GIVE BRAINLIEST!!
The DNA samples that are the most similar include E and B (only one heterozygous difference).
What's in an electrophoresis gel?An electrophoresis gel is a technique used in molecular biology to separate different alleles obtained by PCR.
According to the picture, B, E and F samples contain the mutated allele that causes baldness.
In conclusion, the DNA samples that are the most similar include E and B (only one heterozygous difference).
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help pls its just one and i am done i dont get it
which part of the periodic table would contain an element with a partially filled f sublevel?
Answer:
the blue one is f sub level in period table
in an atom the number of electron is what as the number of protons???
What is the term for transfer of energy from one molecule to another upon absorption of light energy
Answer:
food chain
Explanation:
it is transferring energy from one molecule to another in a food form
A student investigated some properties of lead and recorded the findings in the table below. property observation color dull gray density 11.3 g/cm3 volume of sample 3 cm3 melting point 327°c reaction with air lead oxide forms on the surface electrical conductivity conducts some electricity which statement is true with respect to the investigation? the student investigated only the physical properties of lead. the student investigated only the chemical properties of lead. the student investigated more physical properties than chemical properties of lead. the student investigated more chemical properties than physical properties of lead.
According to the given observation table a student investigate more physical properties than chemical properties of lead.
What is physical and chmical properties?Physical properties of any substance is that proprties which are observable from the simple eyes and in which original chemical composition of substance is not changes. But at the same time some chemical properties are not observable from the simple eyes and in this change in chemical composition also takes place.
Color, density, volume, melting point and electrical conductivity are the physical properties.Reaction with air is a chemical property.Hence student investigate more physical properties than chemical properties of lead.
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Answer:
The answer is "The student investigated more physical properties than chemical properties of lead."
Explanation:
C