Answer:
Explanation:
bc
calculate the number of oxygen atoms and its mass in 50g of CaCo3
The number of oxygen atoms = 3
Mass = 24 g
Further explanationThe formula of a compound shows the composition of the constituent elements
CaCO₃ is composed of 3 types of elements, namely Ca, C and O
The amounts of each of these elements in the compound CaCO₃:
Ca = 1 C = 1 O = 3So the number of oxygen atoms = 3
mass of Oxygen :
[tex]\tt mass~O=\dfrac{3\times Ar~O}{MW~CaCO_3}\times mass~CaCO_3\\\\mass~O=\dfrac{3\times 16}{100}\times 50=24~g[/tex]
Boron has two isotopes. Boron-10 which has a mass of 10.0129 and Boran-11 with a mass of 11.0093 occurs 52.69% of the time and B - 11 47.31% of the time. What is the average atomic mass of boron?
Help me
Answer:
Copper, a metal known since ancient times, is used in electrical cables and pennies, among other things. ... Calculate the average atomic mass of copper. ... The atomic masses of the two stable isotopes of boron 10B (19.78%) and 11B (80.22%) are 10.0129 amu ... (.1978)(10.0129 amu) + (.8022)(11.0093 amu) =10.81 amu.
Explanation:
I hope I help :)
Describe how this instrument works.
Operation:
Answer:
Microscope
Explanation:
Answer:
its a telescope you see stars or plants
Explanation:
160 g or an element with a molar mass of 40 = __ moles?
Answer:
4 moles
Explanation:
The formula of finding moles is
moles = mass / molar mass, therefore
moles = 160 g / 40 g/mol = 4 moles
What are the moles of silver metal produced from 0.0999 mol of copper?
_Cu(s)+_AgNO3(aq) -> _Cu(NO3)2(aq)+_Ag(s)
Answer:
1234567i9812345678912121212121
When comparing plant and animal cells which statement is least accurate?
Plant cells have a cell wall and animal cells do not.
Plant cells have chloroplasts and animal cells do not.
Plant cells have a large central vacuole and animal cells do not.
Plant cells have cell membranes and animal cells do not.
Write the balanced net ionic equation for the reaction of aqueous sodium sulfate with aqueous lead(II) nitrate. Include phases.
net ionic equation:
Answer:
SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)
General Formulas and Concepts:
Solubility RulesExplanation:
Step 1: RxN
Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + NaNO₃ (aq)
Step 2: Balance RxN
Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + 2NaNO₃ (aq)
Step 3: Ionic Equations
Total Ionic Equation:
2Na⁺ (aq) + SO₄²⁻ (aq) + Pb²⁺ (aq) + 2NO₃⁻ → PbSO₄ (s) + 2Na⁺ (aq) + 2NO₃⁻ (aq)
Cancel out spectator ions.
Net Ionic Equation:
SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)
How many milliliters of alcohol are present in 720 mL of brandy?
Answer:
Answer : The volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
Explanation: As we are given that 40.0 % (v/v) alcohol solution. That means, 40.0 mL of alcohol present in 100 mL of solution.
Now we have to calculable the volume of alcohol in 675 mL solution.
As 100 mL of solution contains 40.0 mL of alcohol
So, 675 mL of solution contains alcohol
Thus, the volume of alcohol = 270 mL
Now we have to calculate the volume of water.
The volume of water = Volume of the solution - Volume of alcohol
Volume of water = 675 mL - 270 mL
The volume of water = 405 mL
Thus, the volume of water = 405 mL
Hence, the volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
The 720mL of an 80-proof brandy which is 40.0% (v/v) ethyl alcohol, contains 288 mL of ethyl alcohol.
What is volume/volume percentage?The Percent solutions can be expressed in the form of volume/volume percentage, weight/volume percentage, or, weight/weight percentage. The concentration of the solution in percentage is calculated as the fraction of the weight or volume of the solute related to the total weight or volume of the solution.
The solution where concentration requires to be represented in volume percent (v/v%) when the solute is a liquid phase. It is also applicable to the numerator and the denominator in volume units and is called volume/volume percent.
Volume percentage = (Volume of solute/volume of solution) x 100
The given brandy has ethyl alcohol the v/v % is 40 %.
It means the 40 ml of ethyl alcohol is present in the 100ml of brandy
Given the volume of brandy = 720 ml
Volume of ethyl alcohol in 720 ml of brandy = (40/100)×720 = 288 ml
Therefore, 288 ml of ethyl alcohol is present in 720 ml of brandy which is 40.0% (v/v) ethyl alcohol.
Learn more about volume/volume percentage, here:
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Your question is incomplete, but most probably complete question was,
An 80 proof brandy is 40.0% (v/v) ethyl alcohol. The "proof" is twice the percent concentration of alcohol in the beverage. How many milliliters of alcohol are present in 720 mL of brandy?
nitric acid, HNO3, and calcium hydroxide, Ca(OH)2
net ionic equation:
Answer:
2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
General Formulas and Concepts:
Solubility RulesStrong Acids/BasesExplanation:
Step 1: RxN
HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + H₂O (l)
Step 2: Balance RxN
2HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + 2H₂O (l)
Step 3: Ionic Equations
Total Ionic Equation:
2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2H₂O (l)
Cancel out spectator ions.
Net Ionic Equation:
2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
10 POINTS PLS HELP
Combustion occurs when _____.
oxidation reactions are very slow
oxidation reactions are so fast the substance catches fire
oxygen is removed from another substance
machines use chemical energy to do work
Answer: oxidation reactions are so fast the substance catches fire
Explanation:
Answer:
When oxidation reactions are so fast the substance catches fire
Explanation:
because i am big bwain
What is the momentum of a cat of mass 4 kg that is running south with a speed of 1.5 m/s?
A. 2.7 kg•m/s south
B. 6.0 kg•m/s south
C. 8.3 kg•m/s south
D. 7.1 kg•m/s south
Answer:
option B is correct
Explanation:
momentum(p)=mv
mass= m=4 kg
velocity=v=1.5 m/s
P=4kg*1.5 m/s=6.0 kg.m/s
so option B is correct
I NEED HELP THIS IS FROM MY HOMWORK DUE IN A HOUR
Answer:
Increasing the speed of the particles
Explanation:
The energy absorbed in the phase B is used to increase the speed of the particles.
We can see a positive slope which shows that the temperature is increasing considerably with increasing time.
At this phase the reaction rate is become faster as the temperature change has a considerable effect on reaction rates.
Temperature is directly proportional to the average kinetic energy of reacting particles.
What causes your skin to feel warm when it is in the sun on a summer day?
A Particles in the atmosphere reflect energy from the Sun downward.
B Hot particles from the Sun still carry some heat when they reach your skin.
C The solar wind carries heated air from the Sun's atmosphere to Earth's surface.
D The Sun radiates energy that passes through space and the atmosphere to your skin.
Answer:
idek akxkkwskkd nwkdkekekd
Regional Metamorphism occurs when great masses of rock are exposed to pressure. What does this typically form?
Answer:
Gneiss forms by regional metamorphism from both high temperature and pressure. Quartzite and marble are the most commonly used metamorphic rocks.
J.J. Thomson's plum pudding model of the atom followed the discovery of
A)
negatively charged particles with a very small mass.
B)
positively charged particles with a very large mass.
0)
negative electrons that revolved around a positive nucleus.
D)
positively charged protons that were contained in a concentrated area.
J.J. Thomson's plum pudding model of the atom followed the discovery of negatively charged particles with a very small mass. Thus, the correct option for this question is A.
Who was J. J. Thomson?J.J. Thomson was a British physicist who discovered sub-atomic particles known as electrons within an atom. He also announced that atoms are made up of smaller components.
The plum pudding model is defined by Thomson in order to demonstrate that negatively charged sub-atomic particles known as electrons are surrounded by a volume of positively charged particles known as protons. It is one of the historical scientific model of the atom that governs all sorts of properties of sub-atomic particles.
Therefore, "negatively charged particles with a very small mass" is the discovery that follows J.J. Thomson's plum pudding model of the atom. Thus, the correct option for this question is A.
To learn more about the Plum pudding model, refer to the link:
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Just wanted to know what the response time is :)
An overhead view of two people at the start of a maze. The person in a purple shirt has a line running forward, right, backward, right, forward, ending with an arrowhead pointing to a large gold star. The person in a green shirt has a line running forward, right, backward, right, forward, right, backward, right, forward, ending with an arrowhead pointing to a small gold star.
Zamir and Talia raced through a maze. Zamir walked 2 m north, 2 m east, 4 m south, 2 m east, 4 m north, 2 m east, 3 m south, 4 m east, and 4 m north. Talia walked 2 m north, 6 m east, 3 m south, 4 m east, and 4 m north.
Compare their distances:
Zamir walked
meters and Talia walked
Answer:
Zamir walked
27
meters and Talia walked
19
meters.
Explanation:
27 and 19
Answer:
zamir:27 Talia:19
Explanation:
i got it right on my test :)
Naming inconic compounds and lots of iconic naming
if you just look up the answer it comes up btw!!
have a great day
In which statement does the word theory mean scientific theory?? A) In theory, the experiment will work as planned. B) She has a theory about why the storm arrived later than predicted. C) The atomic theory explains that material objects are made up of atoms. D) The doctor’s prescription for curing a cold is based on his best theory or guess.
Answer: C
Explanation:
I took a quiz on this.
True or False: Scientists use what they know about the properties of different molecules to separate mixtures. *
Answer:
True
Explanation:
Mixtures are substances with indefinite composition. They consist of two or more elements and or compounds in any proportion by mass.
Their constituents retain their identities i.e. physical properties are retained. Their constituents reacts differently to changed conditions. They can easily be separated into constituents by physical methods.From these properties we can clearly identify that to separate mixtures, we use the differences in the chemical properties of the constituents of the mixtures.
Choose all the answers that apply.
Which of the following energy forms are involved in a nuclear power plant?
heat
sound
mechanical
electrical
nuclear
Answer:
heat, electrical, mechanical, nuclear,sound
Explanation:
The power plant is mechanicalised so it produce heat which is in form of electrical and then we start hearing sound
Help with 3.A and B image provided below
a. P=0.971 atm=737.6 mmHg
b. n=2.88 x 10⁻³
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
[tex]\tt P_T=P_1+P_2+..P_n[/tex]
A. vapor pressure of water at 22.5 = 20.4 mmHg
Pt=P H₂ + P H₂O
758 = P H₂ + 20.4
P H₂=737.6 mmHg=0.971 atm
B.Ideal gas Law = PV=nRT
P = 0.971 atm
V = 72 ml = 0.072 L
R = 0.082 L/atm mol
T = 22.5 + 273.15 =295.65
[tex]\tt n=\dfrac{0.971\times 0.072}{0.082\times 295.65}=2.88\times 10^{-3}[/tex]
How many electrons are in the nucleus of an atom with an atomic number of
16?
O None. Electrons are not in the nucleus
08
O 16
O 32
Answer:
None. Electrons are not in the nucleus.
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral .
The atom having atomic number 16 have 16 electrons and these electrons are present out side the nucleus.
The correct chemical formula for aluminum (Al+3) plus chlorine (Cl-1) is what.
Answer:
AlCl₃
General Formulas and Concepts:
Elemental ChargesReading a Periodic TableExplanation:
Step 1: Define
Al³⁺ and Cl¹⁻
Step 2: RxN
Al³⁺ (s) + Cl¹⁻ (g) → AlCl₃
Need to have the same amount of charge (should add to 0)We need 3 Cl's to balance the positive 3+ charge3(-1) for Cl + 1(3+) for Al = 0Answer:
The answer is: AlCl₃
Hope this helped :)))
Explanation:
what is normality and molarity of the concentration of solution?
Answer:
Normality is the number of gram equivalents of solute divided by the volume in liters.
The molarity is the amount of moles in solute divided by the volume in liters.
Moles are the molar mass times grams if you're curious
I hope this helps and good luck!
Answer:
Molarity and normality describe the numbers (moles) of reactants or products dissolved in one liter of solution. Molarity: M = moles of solute contained in one liter of solution. ... Normality is always a multiple of molarity. It describes the “equivalent” moles of reactants involved in chemical reactions.
Explanation:
Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Gram equivalent weight is the measure of the reactive capacity of a molecule. The solute's role in the reaction determines the solution's normality. Normality is also known as the equivalent concentration of a solution.
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Formula for Molar: M = [tex]\frac{n}{v}[/tex]
22. In 4f12, the 12 stands for the
The 12 stands for the number of electrons that fill the f orbital
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
4f¹² :
4 : number of shell
12 : the number of electrons that fill the f orbital
Which structure could a scientist look for in a plant that would identify it as a club moss rather than a liverwort?
O phloem
O spores
O rhizoids
O flowers
Answer:
what e said
Explanation:
How many atom of oxygen are in 2mole of O2
Answer:
12.044 × 10²³ atoms of oxygen
Explanation:
Given data:
Number of atoms of oxygen = ?
Moles of oxygen = 2 mol
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms of oxygen
2 mole × 6.022 × 10²³ atoms of oxygen / 1 mole
12.044 × 10²³ atoms of oxygen
Consider the two electron arrangements for neutral atoms A and B. What is the atomic number of A?
A - 1s?, 2s 2p6,35
B - 1s2, 2s 2p, 5s
Please help!!!!!
Please help!!!!!
Answer:
1.B
2.A
3. B
Explanation:
1. A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing
2. so 2 is electrons of one atom are transferred permanently to another atom.meaning the answer is A
3. is When atoms combine by forming covalent bonds, the resulting collection of atoms is called a molecule. We can therefore say that a molecule is the simplest unit of a covalent compound.
A chemical bond is an attraction between two atoms.
A ionic bond is A bond formed when atoms transfer electrons.