Answer:
A is the answer.
Explanation:
Answer: the answer is B hope it hepls
Explanation:
Use the model to answer the question.
Which element symbol actually represents the model?
Plz answer
Answer:
B
Explanation:
Boron has 5 protons.
A 200.0-mL sample of helium gas is in a cylinder with a movable piston at 110 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?
51.1 kPa
261 kPa
249 kPa
274 kPa
Answer:
P₂ = 261 KPa
Explanation:
Given data:
Volume of sample = 200 mL
Initial pressure = 110 KPa
Initial temperature = 275 K
Final volume = 95 mL
Final temperature = 310 K
Final pressure = ?
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₂ = P₁V₁T₂ /T₁ V₂
P₂ = 110 KPa× 200 mL× 310 K /275 K × 95 mL
P₂ = 6820000 KPa / 26125
P₂ = 261 KPa
ill give u 30 points if u answer this question
Answer:
help can't see what it says
Explanation:
chjzkzkzjzj
what is the electron configuration of a transition metal in block d
Answer:
U gotta check ur book for that or Google maybe..
Which element is likely to be the best conductor of electricity?
copper
lithium
iodine
silicon
Answer:
copper
Explanation:
Answer:
COPPER!!!!!
Explanation:
I got it right on the test, on Edge. Hope this helps. :))))
What Happens When extra Solute is added to unsaturated ,saturated and supersaturated solution
of water is 36.0 g. If any more NaCl is added past that point, it will not dissolve because the solution is saturated. If more solute is added and it does not dissolve, then the original solution was saturated. If the added solute dissolves, then the original solution was unsaturated.
What is the oxidation state of Hg in Hg2Cl2?
Answer:
+1
Explanation:
Electrochemistry. In oxidation–reduction (redox) reactions, electrons are transferred from one A redox reaction is balanced when the number of electrons lost by the reductant Hg(l)∣Hg2Cl2(s)∣Cl−(aq) ∥ Cd2+(aq)∣Cd(s).
As is evident from the Stock number, mercury has an oxidation state of +1. This makes sense, as chlorine usually has an oxidation state of -1.
The oxidation state of Hg in Hg₂Cl₂ compound is +1 as both subscripts of elements are eliminated.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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4. When the sulfide ion is oxidised to the sulfur atom, the number of
1 point
protons in the nucleus ... increase or decrease
Answer:
increase
Explanation:
Oxidation, in chemistry, refers to when electrons are lost by an atom, hence, making the atom more positively charged. In contrast to this is reduction, which is the acceptance of electrons.
In this case, a sulfide ion (S²-) is said to be oxidized i.e loses electrons, till it becomes a sulfur atom (S). As the oxidation number has increased from -2 to 0, this means that the number of protons has INCREASED.
Why are liquid and gas molecules different
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! You think that although there are some differences, the human nervous system is similar to a computer. You're friend says, "No way! A computer is just metal, wires, and plastic." Develop an argument that would persuade your friend that there are similarities between these two systems. Include specific examples and evidence to support your position.
Answer:
We have nerves that are just like wires that run through our body that tells us what is going on and what to do about it. The hard dive like in a computer is our brain, which is made up of three parts that control things like coordination, movement, involuntary, and voluntary movement. The sensory numerous just like the keys in a computer pick up what we are doing in life.
Explanation:
CH4+O2--->CO2+2H2O2
Write a few paragraphs predicting the products of the chemical reaction and explaining why you made this prediction. Your document should:
i. identify the products of the chemical reaction.
ii. explain why these are the products based on trends in the periodic table (the number of valence electrons, electronegativity, etc.).
iii. identify the types of bonds in the reactants and products.
iv. identify the number of each type of bond in the reactants and products.
v. identify the type of reaction.
Riley Greene
Initial prediction : CH_4+O_2 transfers to CO_2+H_2O
Initial Explanation :
The products of this reaction are CO_2 and H_2O. These elements are Carbon Dioxide and Water. Atom's chemical properties are determined by the number of electrons in its outermost shells. Based on the number of electrons in the shells, it decides the reactivity of atoms. Atoms with the same number of electrons in the outer shells have similar chemical properties. If atoms have 1,2 or 3 valence electrons they react by giving out those electrons to become stable. If atoms have 6 or 7 electrons in the outer shell they react by taking in electrons to complete its outer shell.
So Methane has 8 valence electrons while Oxygen has 6. One molecule of methane combined with two oxygen molecules, react to form a carbon dioxide molecule, and two water molecules usually given off as steam or water vapor during the reaction and energy.
In the reaction, the bonds in the methane and oxygen come apart, the atoms rearrange and then re-bond to form water and carbon dioxide.The reactants are on the left side of the equation and the products are on the right. In the reaction, the bonds in the methane and oxygen come apart, the atoms rearrange and then re-bond to form water and carbon dioxide. No new atoms are created and no atoms are destroyed. This reaction is a combustion reaction.
Dot diagram Attached....
Revised prediction : CH_4+O_2 transfers to CO_2+H_2O
Revised Explanation : I was correct initially so I put the same explanation.
The products of this reaction are CO_2 and H_2O. These elements are Carbon Dioxide and Water. Atom's chemical properties are determined by the number of electrons in its outermost shells. Based on the number of electrons in the shells, it decides the reactivity of atoms. Atoms with the same number of electrons in the outer shells have similar chemical properties. If atoms have 1,2 or 3 valence electrons they react by giving out those electrons to become stable. If atoms have 6 or 7 electrons in the outer shell they react by taking in electrons to complete its outer shell.
So Methane has 8 valence electrons while Oxygen has 6. One molecule of methane combined with two oxygen molecules, react to form a carbon dioxide molecule, and two water molecules usually given off as steam or water vapor during the reaction and energy.
In the reaction, the bonds in the methane and oxygen come apart, the atoms rearrange and then re-bond to form water and carbon dioxide.The reactants are on the left side of the equation and the products are on the right. In the reaction, the bonds in the methane and oxygen come apart, the atoms rearrange and then re-bond to form water and carbon dioxide. No new atoms are created and no atoms are destroyed. This reaction is a combustion reaction.
The reaction as shown is a combustion reaction.
The reaction; CH4 + O2 ---> CO2 + 2H2O2 is a combustion reaction because methane reacts with oxygen to yield carbon dioxide and water. Carbon is always tetravalent in its compounds hence there are four carbon oxygen bonds in the product. Lets recall that the bonds in CH4 re nonpolar because of the minimal electronegativity difference between carbon and hydrogen. Even though the bond in CO2 is polar but the eneitire molecule is nonpolar because the dipoles cancel out. Water is a polar molecule.
Hydrogen forms only one bond hence in water molecule, each hydrogen atom is bonded to a central oxygen atom. All the bonds in water and carbon dioxide as well as in methane and oxygen are covalent.
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a girl pose a spoonful of sugar into a glass of warm water water into the sugar disappears when she choose the water you notice that it t is now suite which describes the kind of matter in the glass
A=Compound
B=An element
C- soultion
d- sUBTANCE
Answer:
Solution!
Explanation:
Becuase the water didn't change when the sugar was mixed in. :)
The sun consists of _____________ % of the mass in our solar system.
Answer:
Explanation:
An atom of magnesium with 14 neutrons has a mass number of what ?
Answer:
26
Explanation:
Given parameters:
Number of neutrons = 14
Unknown:
Mass number = ?
Solution:
The mass number of an atom is the sum of protons and neutrons in the atom.
mass number = number of protons + number of neutrons
Since the atom here is magnesium, number of protons is 12
Mass number = 14 + 12 = 26
13 Apply Place a check mark in the box to indicate
which type of mutation is being shown.
Original sequence
deletion insertion substitution
deletion insertion substitution
deletion insertion substitution
Answer:
A. ✔️Substitution
B. ✔️Insertion
C. ✔️Deletion
Explanation:
In A, the type of mutation that is shown is Substitution. In B, the type of mutation shown is Insertion and in C, the type of mutation shown is Deletion.
Mutation refers to the change in the DNA sequence. This occurs in an organism. In gene mutation, the structure of DNA molecule changes and produces a different allele of a gene. While in chromosome mutation, there is the change in the structure or number of the whole chromosomes in a particular cell.
Actually, mutations can take place both in prokaryotic cell and in eukaryotic cell.
In genetics, there are: Substitution, Insertion and Deletion mutations.
Substitution mutation is an exchange of one base for another. Insertion mutation is simply addition of one or more nucleotide pairs in a DNA sequence while Deletion mutation refers to the situation in which a sequence of DNA is left out when there is DNA replication.
Answer:
A. Substitution
B. Insertion
C. Deletion
Explanation:
A. There is a replacement in C G there is A T.
B. There is one more base.
C. There are 8 base there should be 9.
SECTION A
For these questions, your equation will be straight forward to balance.
In a titration, 20 cm3 of 2.0 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
In a titration, 20 cm3 of 0.2 mol dm-3 HCl reacted with 50 cm3 of NaOH. What was the concentration of the sodium hydroxide?
In a titration, 20 cm3 of 0.15 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
In a titration, 20 cm3 of 1.14 mol dm-3 HCl reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
Answer:
20cm=the length of the causation that it loads about the contrasting of the solution it is an easy question to answer it just has too many parts I answered one and I hope it helped to give you a hint towards solving the whole thing good luck
Explanation:
I tried!
In a titration, 20 cm3 of 2.0 mole dm-3 HCl reacted with 25 cm3 of NaOH. The concentration of the sodium hydroxide is 1.6 mole.
What is titration?Titration is defined as the procedure of determining the quantity of some ingredient of a sample by introducing a precisely known quantity of another substance to the measured sample with whereby the desired ingredient interacts in a predictable manner.
There are basically four type of titration.
Acid base titrationRedox titrationPrecipitation titrationComplex metric titrationM1V1 = M2V2
The concentration of the sodium hydroxide
M2 = M1V1 / V2
M2 = 2.0 x 20 / 25
M2 = 1.6 mole
The concentration of the sodium hydroxide = 0.08 mole
The concentration of the sodium hydroxide = 0.12 mole
The concentration of the sodium hydroxide = 0.912 mole
Thus, in a titration, 20 cm3 of 2.0 mole dm-3 HCl reacted with 25 cm3 of NaOH. The concentration of the sodium hydroxide is 1.6 mole.
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How many molecules of glucose are in 1,456 grams of glucose?
1. 8.77x10^26
2. 1.08x10^26
3. 4.87x10^24
4. 1.34x10^-23
Answer:
4.87×10²⁴ molecules
Explanation:
Given data:
Mass of glucose = 1456 g
Number of molecules = ?
Solution:
Number of moles of glucose:
Number of moles = mass/molar mass
Number of moles = 1456 g/ 180.156 g/mol
Number of moles = 8.1 mol
1 mole of glucose contain 6.022×10²³ molecules
8.1 mol × 6.022×10²³ molecules / 1 mol
48.7×10²³ molecules
4.87×10²⁴ molecules
an atomic mass unit is defined as exactly
Answer:Mass of an atom
Explanation:
Answer:Atomic Mass Units (amu): a mass exactly equal to one-twelfth mass of carbon-12 atom.
Explanation:
Dating of Rock Layers
Answer all 12 questions relating to the images below
English (US)
100
Answer:
I'm sorry, we need the image to answer it.
Explanation:
what process creates deltas?
Explanation:
A delta is a process that forms by river deposition into an ocean or marine environment.
Sediments carried by rivers in their old stage are brought near the mouth of an ocean. As the velocity of the river reduces, sediments begins to settle out. Small river tributaries breaks out into the ocean. Delta forms at an interphase between a small and large body of water. The deposited sediments forms distinct shapes as they enter the larger body of water.Choose all of the following mole ratios that are correct for the reaction given below. Be sure to choose all that apply.
N2 + 3 H2 --> 2 NH3
2 moles N2 = 3 moles H2
2 moles NH3 = 1 mole N2
3 moles H2 = 1 mole N2
3 moles H2 = 2 moles NH3
Answer:
2 moles NH3 = 1 mole of N2
3 moles of H2 = 1 mole of N2
3 moles of H2 = 2 moles of NH3
Explanation:
The balanced equation for the reaction is given below:
N2 + 3H2 —> 2NH3
From the balanced equation above,
1 mole of N2 reacted with 3 moles of H2 to produce 2 moles of NH3.
Thus, we can say that:
1 mole of N2 = 3 moles of H2
1 mole of N2 = 2 moles of NH3
3 moles of H2 = 2 moles of NH3
Thus, considering the options given above, the right answers to the question are:
2 moles NH3 = 1 mole of N2
3 moles of H2 = 1 mole of N2
3 moles of H2 = 2 moles of NH3
Answer:
3 h2=2nh3
2nh3=1n2
3h2=1n2
Explanation:
What is kinetic energy of a 100 kg object that is moving with a speed of 15 m/s
Answer:
16875 Joules
Kg m^2 s^-2 = Joule ,so The kinetic energy of a body of mass 150 Kg moving at 15m/s is 16875 Joules.
Explanation:
when propene gas (C3H6) is added to bromine liquid, another liquid is produced which has the formula C3H6Br2. what is the chemical equation/formula
Answer:
C3H6 + Br2 → C3H6Br2
Explanation:
The reaction in which C3H6Br2 (1,2-Dibromopropane) is created is:
C3H6 + Br2 → C3H6Br2We can see that the only difference between the product (C3H6Br2) and the known reactant (C3H6) of the reaction is two bromine atoms (Br2). Br2 is diatomic bromine - a molecule we get after combining two bromine atoms. This compound is a red-brown liquid at room temperature, which means that that is the liquid described in your question.
Name a molecule that is small enough to enter the cell
protein molecule
starch molecule
oxygen molecule
nitrogen
Answer:
oxygen molecule
Explanation:
I belive it is oxygen molecule
Answer:
Oxygen Molecle
Explanation:
I think that it is an oxygen molecule because oxygen can go through and or everything.
Which type of bond will chromium atoms likely to form with other chromium atoms
A:ionic
B:covalent
C:metallic
Answer: B
Explanation: Covalent bonds where electrons are not shared equally between two atoms are called polar covalent bond. As shown above, the electrons in a covalent bond between two different atoms (H and Cl in this case) are not equally shared by the atoms. This is due to the electronegativity difference between the two atoms.
There are two types of chemical compound one is covalent compound and other is ionic compound in chemistry. The covalent bond will be formed between two chromium atoms. the correct option is option B.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent bond formed by sharing of electron and ionic bond formed by complete transfer of electron.
Element with same electronegativity difference combine together by covalent bond whereas ionic bond is formed by elements whose electronegativity difference is high.
As two chromium is combining that is two two element with same electronegativity is combining therefore, formation of covalent bond is the only possibility.
Therefore covalent bond will be formed between two chromium atoms. the correct option is option B.
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help which is the right answer
Answer:
936g/mol
Explanation:
To find the molar mass of a molecule, you find the sum of the molar masses of each atom in the molecule.
This compound has 40 carbon atoms, 60 Hydrogen atoms, 10 Nitrogen atoms, 12 Oxygen atoms, and 2 Sulphur atoms.
The molar mass of:
Carbon is 12g/molHydrogen is 1g/molNitrogen is 14g/molOxygen is 16g/molSulphur is 32g/mol[tex](12 \times 40) + (60 \times 1) + (14 \times 10) + (16 \times 12) + (32 \times 2) = 936[/tex]
Which of these sets of elements have similar physical and chemical properties?
Answer:
F,Cl,I,BR
Explanation:
There all non-metals
The chemical and physical properties of Fluorine, Chlorine, Bromine, and Iodine have been similar. Thus option B is correct.
The physical and chemical properties of the elements have been based on the presence of the valence electrons in the element. The valence electrons are responsible for the reactivity of the element, and thereby the physical and chemical properties.
The elements belonging to the same group have been consisted of the same number of valence electrons, and thereby possess similar chemical and physical properties.
In the given set of options, Fluorine, Chlorine, Bromine, and Iodine have been belonging to the same group 17, and all have 7 valence electrons. The chemical and physical properties of these elements have been similar. Thus option B is correct.
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Which of the following produces a chemical change?
nge?
O A. Sanding a plank of wood
O B. Grilling a piece of meat
O C. Drying a towel on a clothesline
O D. Pressing clay into a ball
please help ASAP i’m literally struggling
Answer:
B. Grilling a piece of meat
since the process involves burning
Is vacuole a plant or animals cell
Answer:
plant
Explanation:
let me know if correct
A new material was produced in a laboratory by bonding atoms of
different elements together in a unique arrangement. Other laboratories
were able to reproduce these results, producing the same material with
the same elements in the same arrangement. What type of matter was
produced?
*
Answer:
A compound
Explanation:
A compound is a substance formed from the chemical combination of atoms of two or more elements together.
A chemical compound always contains the same kinds of atoms of elements combined together in as specific ratio by mass and can be represented by a chemical formula. For example, water is a compound formed from the chemical combination of hydrogen and oxygen atoms in the ratio of 2 : 1. It has a chemical formula H2O.
A pure compound also always have the same chemical properties irrespective of the source of the compound. For example, chemically pure has similar properties irrespective of whether it is obtained from rain, streams or underground wells.
Therefore, if a new material was produced in a laboratory by bonding atoms of different elements together in a unique arrangement and other laboratories were able to reproduce these results, producing the same material with the same elements in the same arrangement, then the substance must be a compound.