Answer:
No you can not divide a primary substance into a seperat one because ot wpuld be like divideing the universe
Which types of changes must follow the law of conservation of mass?
Both physical and chemical changes
Neither physical nor chemical changes
Only physical changes
Only chemical changes
Answer: both
Explanation:
Alleles are different forms of ribosomes.
1 point
A. True
B. False
Answer:
true
Explanation:
i did the test
Answer: False
Explanation:
is scrap metal pieces an example of a pure substance or a mixture ?
Answer:
mixture i think
Explanation:
Answer:
mixture
Explanation:
what does kyle learn at the end
Answer:
Umm who's Kyle?
Explanation:
Answer:
his skills aren’t as valuable to the team as he thought
Explanation:
element A it's valance number is 3 and element B it's valance number is 6 make it compound
Answer:
A2B
Explanation:
A = 3
B = 6
exchange valencies
A6B3
A2B
Q.3 Which the following statements about the given reaction are correct:
3Fe(s) + 4H2O(g)- Fe203 (S) + 4H2(g)
i) Iron metal is getting oxidized
ii) Water is getting reduced
iii) Water is acting as reducing agent
iv) Water is acting as oxidizine agent
a) (i), (ii) and (iii) b)(iii) and (iv)
c) (i), (ii) and (iv) d) (ii) and (iv)
Answer:
The statements which are correct are;
c) (i), (ii) and (iv)
Explanation:
The chemical equation is presented as follows;
2Fe(s) + 3H₂O(g) → 3Fe₂O₃(s) + 3H₂(g)
Therefore, we have;
i) The iron gains oxygen atoms and therefore gets oxidized
The iron loses 3 electrons each to become oxidized to Fe³⁺ in Fe₂O₃
ii) The water loses oxygen and therefore it is getting reduced
iv) The water donates oxygen and therefore it is acting as the oxidizing agent
The correct options are (i), (ii) and (iv).
What is involved in creating genetically modified bacteria?
A. allowing them to reproduce freely
B. changing their food source
c. using biotechnology techniques
D. growing them on selected plants
Question:
One of the properties we associate with diamonds is their luster. How would you define this
term?
Plz help?!
Answer:
luster means either sheen/glow or reflected light
Explanation:
luster is the appearance of mineral's surface in terms of light-reflective qualities
Picture a neutral S atom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
ASAP PLEASE
Answer:
has 6 valence electrons as its in group 6
the atom will gain electrons
the charge will be 2- as it will gain 2 electrons to be a full configuration
What is the
difference between
dominant and
recessive traits
Answer:
An allele is dominant, it will express in a person the characteristic to which it is related. When an allele is recessive, it is less likely to express the function to which it is related. Recessive traits only occur when in a person both alleles are recessive.
What is the molarity of the following solution? 3.48 mol in 4.1 L of solution
Answer:
molarity is moles/L so take the 3.48 and divide it by 4.1L
and get 0.848... and need to keep your answer to 2 digits as that is th emost precise measurement you have (the 4.1L)
so 0.85mol/L
Explanation:
Ethyl ethanoate is used as a solvent for varnishes and in the manufacture of artificial leather. The formula below represents a molecule of ethyl ethanoate. Write the empirical formula for this compound.
Answer: The empirical formula for the ethyl ethanoate molecule is C2H4O.
Explanation:
Ethyl ethanoate is an ester which is formed together with water when ethanol reacts reversibly with acids. This can be illustrated below:
CH3COOH +. C2H5OH <----> CH3COOC2H5 +
H2O
Ethyl ethanoate can be used as an important solvent for varnishes and in the manufacture of artificial leather.
Different formulas can be used to illustrate a chemical compound.
--> Empirical formula of a compound is used to illustrate the simplest whole-number ratio of atoms in a compound.
--> Structural formula of the compound gives an illustration of how the atoms of the compound are bonded to each other.
--> Molecular formula shows the number of each type of atom in a molecule.
The formula given, the molecular formula of the compound is C4H8O2:
C4 H8 O2
4 : 8 : 2
Using 2 to divide through to get the simplest ratio gives rise to C2H4O as the empirical formula.
HELP HELP HELP HELP HELP HELP HELP HELP HELP
Answer:
3
Explanation:
I got this i am very smart
Answer:
The answer is 3) same mass more volume
Explanation:
Mass measures the amount of matter in a substance or an object.
Volume measures the amount of space that a substance or an object takes up.
An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?
0
24
28
52
Answer:
24
Explanation:
In an uncharged atom, the number of protons is always equal to the number of electrons. For example, carbon atoms include six protons and six electrons, so carbon's atomic number is 6.
Similarly, since an atom of chromium contains 24 protons, it also contains the same amount of electrons, which is 24.
Answer:
24 is your answer
Explanation:
If a substance melts at 20oC, what is its freezing point?
Answer:
It is difficult, if not impossible, to heat a solid above its melting point because the heat that ... in a solid are packed in a regular structure that is characteristic of that particular substance.
#carryONlearningBalance the following
Mn(NO2)2
+
BeCl2 →
Be(NO2)2 +
MnCl2
Answer:
Double Displacement (Metathesis)
Beryllium Chloride - BeCl2
Manganese(II) Chloride - MnCl2
Explanation:
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 reagents.
The balanced equation for the given reaction is:
[tex]\rm Mn(NO_2)_2 + 2BeCl_2 \rightarrow 2Be(NO_2)_2 + MnCl_2[/tex]
In chemistry, a balanced equation is a representation of a chemical reaction that follows the law of mass conservation. It assures that on both sides of the equation, the total number of atoms of each element remains constant.
[tex]\rm Mn(NO_2)_2 + BeCl_2 \rightarrow Be(NO_2)_2 + MnCl_2[/tex]
Balance the metals:
[tex]\rm Mn(NO_2)_2 + BeCl_2 \rightarrow Be(NO_2)_2 + MnCl_2[/tex]
Balance the non-metal (chlorine):
[tex]\rm Mn(NO_2)_2 + BeCl_2 \rightarrow Be(NO_2)_2 + MnCl_2[/tex]
Balance the nitrogen:
[tex]\rm Mn(NO_2)_2 + BeCl_2 \rightarrow Be(NO_2)_2 + MnCl_2[/tex]
Balance the oxygen:
[tex]\rm Mn(NO_2)_2 + BeCl_2 \rightarrow Be(NO_2)_2 + MnCl_2[/tex]
Balancing all the atom
[tex]\rm Mn(NO_2)_2 + 2BeCl_2 \rightarrow 2Be(NO_2)_2 + MnCl_2[/tex]
The balanced equation is:
[tex]\rm Mn(NO_2)_2 + 2BeCl_2 \rightarrow 2Be(NO_2)_2 + MnCl_2[/tex]
To know more about balanced equation, here:
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Plant cells and animal cells were observed under a microscope. The characteristics of two cells are listed below.
Cell X: Has chloroplast
Cell Y: Does not have a cell wall
Which statement about the two cells is correct? (5 points)
a
Cell X has a cell membrane.
b
Cell X has a small vacuole.
c
Cell Y has a large vacuole.
d
Cell Y has chloroplast.
Answer:
The answer is B
Explanation:
ITs B
Answer:
Cell X has a cell membrane
Explanation:
I took the test and got it right.
chemical equation for table salt and water
Answer:
sodium chloride—is NaCl.
Explanation:
Table salt is an ionic compound, which breaks into its component ions or dissociates in water. These ions are Na+ and Cl-. The sodium and chlorine atoms are present in equal amounts (1:1 ratio), arranged to form a cubic crystal lattice.
Answer:
Chemical equation for nacl dissolving in water
NaCl(s) H2O⇌ Na+(aq)+Cl−(aq) .
Explanation:
What is the molecular formula of paradichlorobenzene that has a molar mass of 147.g/mol and an empirical formula of C3CIH2?
Answer:
the molecular formula of paradichlorobenzene is C6H4CL2
If the price of peaches increases, what can be expected?
More peaches will be sold.
Fewer peaches will be sold.
The number of peaches sold will be unaffected.
Peach orchards will produce less fruit.
Answer:
fewer peaches will be sold
Explanation:
if the price increases less people will want to buy it, but the orchards would still get money so they wouldnt be affected
Answer:
fewer peaches
Explanation:
Plz help I need the answer now!! Which statement is best supported by the evidence on the map?
A. Oil is produced mostly in the southern part of Africa.
B. Gold is found in every country in Africa.
O
C. Iron ore is found mostly in northern Africa.
D. Each country in Africa has about the same amount of each natural
resource.
Answer:
I'd say C. You can eliminate the rest of the answers and get C. Most of the iron is found up North on the map.
Explanation:
True or false? Covalent molecules are formed when non-metal atoms share electrons with other non-metal atoms.
Answer:
true
covalent bonds are between non metals and nonmetals. and they are sharing electrons.
HEY Plzzzzzzzzzzz HELP ILL GIVE BRAINLIEST ASAPPPPPPPPPPP
Phosgene (Cl2CO), a poison gas used in World War I , is formed by the reaction of Cl2 and CO. The proposed mechanism for the reaction is
Cl2⇌2Cl(fast,equilibrium)
Cl+CO⇌ClCO(fast,equilibrium)
ClCO+Cl2→Cl2CO+Cl(slow)
What rate law is consistent with this mechanism?
Answer:
Rate = k [ClCO][Cl2]
Explanation:
Cl2⇌2Cl(fast,equilibrium)
Cl+CO⇌ClCO(fast,equilibrium)
ClCO+Cl2→Cl2CO+Cl(slow)
The rate determining step from which the rate aw is obtained from is the slowest step of a chemical reaction. In this reaction, the slowest step is;
ClCO+Cl2 → Cl2CO+Cl (slow)
The rate equation for the step is;
Rate = k [ClCO][Cl2]
ClCO is an intermediate and would eventually get cancelled out from the overall rate equation.
Phosgene is the chemical used in the formation of pesticides and ios poisonous. The rate law is given as, k [chloroformylradical][chlorine gas].
What is rate law?The rate law is the relation of the concentration of the reactants and the products with that the speed of the reaction.
The reaction for the formation of phosgene is given as,
[tex]\rm Cl_{2} \rightleftharpoons 2Cl\; (fast,equilibrium)\\\\\rm Cl+CO \rightleftharpoons ClCO\; (fast,equilibrium)\\\\\\rm ClCO+Cl_{2}\rightarrow Cl_{2} CO+Cl\; (slow)[/tex]
The rate law is determined by the rate-determining step which is the slowest step of the reaction.
[tex]\rm ClCO+Cl_{2}\rightarrow Cl_{2} CO+Cl\; (slow)[/tex]
The rate of the equation is given as,
[tex]\rm Rate = k [ClCO][Cl_{2}][/tex]
As COCl is an intermediate the third step will be the rate-determining step.
Therefore, the slow step determines the rate of the reaction.
Learn more about rate law here:
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What is the percent composition of C4H10? (4 points)
44.6% C and 45.4% H
57.3% C and 42.7% H
82.7% C and 17.3% H
89.4% C and 10.6% H
Answer:82.7% C and 17.3% H
Explanation:
C4 = 12.0107g/mol x 4 = 48.0428 g/mol
H10 = 1.00794 g/mol x 10 = 10.0794 g/mol
Molar Mass of Butane, C4H10 = 48.0428 g/mol + 10.0794 g/mol= 58.1222 g/mol
percent composition of Carbon is = ( mass of carbon contained in butane / molar mass of Butane) x 100
=(48.0428 /58.1222) x 100% = 0.8265 x 100
=82.65% =82.7% of Carbon.
Percent composition of Hydrogen = (mass of Hydrogen contained in Butane / molar mass of Butane )x 100
( 10.0794/58.122 ) x 100% =0.1734 x 100
= 17.3% OF Hydrogen.
Answer:
C- 82.7% C and 17.3% H
Explanation:
I took the Quiz
Be able to describe the relationship between Freedom of Movement and phase change.
Ion knoe Wdym by “be able to describ’ so ima put it in my own words idr lol:)
if you talm bout some kentic energy or sum ok but other Dan dat ion knoe tbh
I can explain how transferring kinetic energy in and out of a substance can cause a change
A chemist weighed out 2.9 g of nickel. Calculate the number of moles of nickel she weighed out. Be sure your answer has the correct number of significant digits.
Answer:moles = 2.9 g Ni × 1 mol Ni 58.69 g Ni = 0.0663 mol Ni
explain how sand is form
Answer:
Sand comes from many locations, sources, and environments. Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar .
Explanation:
2. Which BEST compares bacteria and viruses?
bacteria are smaller than viruses
O bacteria are living organisms, but viruses are not
O bacteria cause disease, but viruses do not
O bacteria have genetic material, but viruses do not
Answer:
the sewcond one bacteria are living organisms, but viruses are not
Explanation:
Answer:
Bacteria are living organisms, but viruses are not
Explanation:
4. How many electrons do each of the following kinds of matter have in each atom? a. silver 47 protons electrons b. carton: 6 protons electrons Sodium: 11 protons electrons d. neon 10 protons electrons e. iodine. 53 protons electrons
Answer:
a. 47 electrons
b. 6 electrons
c. 11 electrons
d. 10 electrons
e. 53 electrons
Explanation: If you are talking about neutral atoms (where as the number of protons in an atom is equal to the number of electrons in the atom), or are just being introduced to atoms then the number of electrons will be equal to the number of protons the atom has. Or vice versa, the number of protons will be equal to the number of protons in an atom. For example, in a neutral atom, with 51 protons, will have 51 electrons. Or an atom with 5 electrons will have 5 protons.