Answer:
= 1.615 moles
Explanation:
I did it on a test and got it right
Give below are the four mixtures. Choose the correct one which can be separated by winnowing. (i) soybean and chickpeas (ii) wheat and rice (iii)cotton and cornflakes (iv)Banana wafers and chips Which of these can be separated by the method of winnowing?
Answer:
Banana wafers and chips
Explanation:
Winnowing is the process of separating heavier and lighter components of a mixture by blowing air through the mixture. This implies that the relative weight of the particles in the mixture determines whether they can be separated by winnowing or not.
However, chips are heavier than wafers. wafers refer to a very light snack which is easily blown away by a current of air. Hence banana chips and wafers can be separated using the method of winnowing.
true or false? British commander Henry Hamilton was also
known as the "hair buyer" because he paid his
soldiers to cut their own hair.
if it is false give an explanation to why it is false
That is true he was known as the hair buyer
Answer:
its true.
i did it on edg 2020
Which of the following parts of a forest ecosystem could not become a fossil?
A. twigs that dropped from trees
B. a dead mouse
C. a puddle
D. deer footprints in the soil
The parts of a forest ecosystem could not become a fossil are; deer footprints in the soil and a puddle.
A fossil is formed from the remains of plants and animals that have died. Anything that is not plant or animal material can never be turned into fossil. Fossil is rich in carbon.
A puddle just refers to a percolation of water. A puddle and deer footprints in the soil are not of plant or animal origin.
As such, deer footprints in the soil and a puddle could not become a fossil.
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Which of the following reactions would result in increased entropy?
Answer:
A option
Explanation:
Because recatants are in solid form having less enetropy and products are liquid form having more entropy
While other options reactants and products are in same phase gas phase having same entropy
The reaction that would result in increased entropy is the combustion reaction;
KNO3(s)--->K+(aq)+NO3-(aq). Option A
This is further explained below
What is a combustion reaction?Generally, a combustion reaction is simply a combustion process that occurs when a material combines with oxygen gas, producing energy as light and heat.
In conclusion, the chemical reaction KNO3(s)--->K+(aq)+NO3-(aq) is has all properties of a combustion reaction as the solid reactants gives an aq solution.
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Which graph represents the function f(x) = 2|x|?
Answer:
It will look like a v starting the at point (0,0) with a slope of 2
Explanation:
Answer:
look at the graph
Explanation:
hope this helps, pls mark brainliest :D
what do african snails eat
Answer:
hope it helps you a little
When enthalpy of reactants is higher than the product then the reaction will be.
Answer:
The reaction will be endothermic represented by a positive (+) sign
While working in the lab, you observe the following volume.
What is the value that should be recorded?
Select one:
a)17.4 mL
b)18.4 mL
c)13.4 mL
d)19.4 mL
Answer:
B 18.4L
Explanation:
Answer:
The answer is 18.4 mL
The liquid is between 19 and 17
so the answer will be 18.4 mL
which of the following gas samples would have the largest number of representative particles at STP?
a) 0.10 L Xe
b) 0.007 L SO3
c) 12.0 L He
d) 7.0 L O2
c) 12.0 L He would have the largest number of representative particles at STP
Further explanationGiven
The gas samples
Required
The largest number of particles
Solution
The largest number of particles = the largest amount of moles
At STP 1 mole = 22.4 L and 1 mole = 6.02 x 10²³ particles
Quickly we will be able to determine that option C has the largest number of particles because it has the largest number of volumes
or we can find the mole of each gas sample
Let's find each mole of the gas sample
a. 0.10 L Xe
[tex]\tt \dfrac{0.1}{22.4}=0.0045[/tex]
b. 0.007 L SO3
[tex]\tt \dfrac{0.007}{22.4}=0.00031[/tex]
c. 12.0 L He
[tex]\tt \dfrac{12}{22.4}=0.536[/tex]
d. 7 L O2
[tex]\tt \dfrac{7}{22.4}=0.313[/tex]
Part F
Based on the model, do you think a fossil can form anywhere on Earth, or does fossil formation require certain
conditions? Explain your answer.
Answer:
Yes, the process of fossilisation is a continuous one. If the conditions are right, a dead plant or animal will be preserved in the rocks of the future, just as they were in the past.
Explanation:
For a fossil to form, several conditions have to be met. First of all, the animal had to live in the given area! Animals live in many environments on Earth, but not everywhere. The water above many lake bottoms and many areas of the deep ocean bottom are stagnant. The bottom water is never exchanged with surface waters, so the water contains no dissolved oxygen. Animals cannot live without oxygen, so no animals live there. In these situations, the only possibility of fossilization is if a fish or other swimming animal dies in oxygen-rich waters above, sinks down into the stagnant muddy bottom, and is buried by sediments.
Based on the model it can be said that fossil formation require certain conditions ( i.e YES )
What is fossilisation ?Fossilisation is the process of preserving plants and animals in a solid petrified form such as rocks. Fossilisation is a continous process which is seen when dead plants and animals are left to become fossils given that the necessary conditions are met.
Hence we can concude that Based on the model it can be said that fossil formation require certain conditions ( i.e YES )
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When hydrogen gas reacts with oxygen gas, the potential energy diagram for the reaction will appear more to which of the following?
Answer:
Maybe is D....
Explanation:
When the hydrogen peroxide decomposed,it graph such as A so maybe the formation of hydrogen peroxide is opposite direction as the A....Hope can help you.....
1. How many grams are in 0.20 moles of N,?
Answer:
[tex]\boxed {\boxed {\sf About \ 2.8 \ grams \ of \ nitrogen}}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass.
1. Molar Mass
The molar mass of an element can be found on the Periodic Table. We are looking for nitrogen or N.
Nitrogen (N): 14.007 g/mol2. Convert from moles to grams
Use the molar mass as a ratio or fraction.
[tex]\frac{14.007 \ g \ N}{1 \ mol \ N}[/tex]
Multiply the given number of moles (0.20) by the fraction we just made.
[tex]0.20 \ mol \ N *\frac{14.007 \ g \ N}{1 \ mol \ N}[/tex]
When multiplied, the moles of nitrogen will cancel each other out.
[tex]0.20*\frac{14.007 \ g \ N}{1}[/tex]
The denominator of 1 can be ignored to create a simple multiplication problem.
[tex]0.20 *14.007 \ g \ N[/tex]
[tex]2.8014 \ g \ N[/tex]
3. Round
The original measurement of moles (0.20) gives 2 significant figures, the last 2 and 0.
Therefore, we must round our answer to 2 sig figs. This is the tenths place for this number of grams we found.
[tex]2.8014 \ g \ N[/tex]
The 0 in the hundredth place tells us to leave the 8 in the tenth place.
[tex]\approx 2.8 \ g\ N[/tex]
There are about 2.8 grams of nitrogen in 0.20 moles of nitrogen.
Balance the following chemical
equation by providing the correct
coefficients.
[ ]FeBr3 + [ ]Na2S → [ ]Fe2S3 + [ ]NaBr
Answer:
Explanation:
A chemical formula can be defined as a notation that is used to show which element and how many is contained in a chemical compound.
Also, in chemistry, the sum of charges of the anion and the cation of any ionic compound is always equal to zero.
A chemical equation is considered to be balanced when the amount of reactants on the left is equal to the amount of products on the right.
Therefore;
[2]FeBr3 + [3]Na2S → [1]Fe2S3 + [6]NaBr
In the above chemical equation, we will balance the reactants in the chemical equation with the smallest coefficients possible;
[tex] 2FeBr_{3} + 3Na_{3}S ----> Fe_{2}S{3} + 6NaBr [/tex]
Two (2) moles of Iron (III) Bromide reacts with two (2) moles of Sodium Sulfide to form Iron (III) Sulfide and Sodium Bromide.
What forms when two atoms combine? PLEASE HELP!!!!!!!
A. a molecule
B. a nucleus
C. a proton
D. an electron
Answer:
Option A - nucleus
Explanation:
A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.
Two atoms combine to form a molecule.
What is a molecule?
Molecule is two or more atoms connected by chemical bonds and form the smallest unit of a substance that retains the composition and properties of that substanceThe atoms can be the same like in oxygen molecule - An oxygen molecule has 2 oxygen atomsThe atoms can be different like in a water molecule - A water molecule has 2 hydrogen and 1 oxygen atomWhat is a nucleus?
The nucleus is positively charged region at the center of the atomIt consists of two types of subatomic particles packed together. The particles are protons and neutronsProton has a positive charge and neutron is electrically neutralWhat is a proton?
A proton is a subatomic particle found in nucleus of every atomProtons have a positive electric charge The number of protons in each atom is its atomic numberWhat is an electron?
It was discovered by English physicist J.J.Thomson Electron is a negatively charged subatomic particle that can be either bound to an atom or freeThey exist outside the nucleusThey are significantly smaller in mass and have both wave-like and particle-like characteristicsLearn more about Molecules at https://brainly.com/question/13348791
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Calculate the energy of a photon with a frequency of 3.20 x 10^-11 s^-1
Answer:
E = 21.22×10⁻⁴⁵ J
Explanation:
Given data:
Frequency of photon = 3.20×10⁻¹¹ s⁻¹
Energy of photon = ?
Solution:
Formula:
E = h×f
h = plancks constant = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 3.20×10⁻¹¹ s⁻¹
E = 21.22×10⁻⁴⁵ J
Which of the following is NOT a sign of a chemical reaction?
A. Change in color
B. Change in size
C. Bubble formation
D. A temperature change
aluminiuim is obtained industrially by the electrolysis of aluminium oxide heated to high temperatures. explain the meaning of the term electrolysis.
Answer: When an electric current is passed through a substance to effect a chemical change.
HURRRYYYY!!!!
Which of the following will lead to a thunderstorm?
The atmospheric factors which leads to thunderstorm are moisture, unstable air, and air way for the surface air to rise. Hence, option c is correct.
What is thunderstorm ?Thunderstorm is a natural phenomenon occurring from the collision of clouds and accompanied with electrical current and lightening. Severe thunderstorms produce convective instability .
This instability of air brings about a significant negative buoyancy in conjunction with thunderstorm downdrafts. Intense evaporation, negative buoyancy, and a powerful downdraft are produced as the dry air entrains with the cloud's wet air.
Thunderstorms also causes tilting of storms, displaces updraft from downdraft; Creates a vacuum affect at the top of storms and thus lift the air in the surface.
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Help me pleasee!!!!! (revised)
Answer:
bal2 is the correct answer hope this hlps have a great rest of your day.
Explanation:
which description shows copper at rtp?
a) stationary and closed together
b) stationary and randomly arranged
c)vibrating and in a regular arrangement
d) vibrating and in a random arrangement
Answer:
c)vibrating and in a regular arrangement
Explanation:
Copper is a chemical element represented by the symbol Cu and having atomic number 29. Copper is a transition metal which means its subshells are not completely filled and that is why they are vibrating in the room temperature. But copper is a solid at room temperature with regular arrangement of atoms.
Hence, the correct answer is "c)vibrating and in a regular arrangement".
a) Of options (a) - (d) below, highlight the (unbalanced) chemical equation that represents
the combustion reaction of cellulose (like what we see with the wood burning in a
campfire above)
a) O, + H2O → C + CH1,05 + CO2
b) C6H100, + O2 + C + CO, + H,O
c) CH4,05 + CO2 → C+ O2 + H,O
d) CO, + H2O → C.H.O. + O2
Answer:
c...............
Explanation:.............................yuuuuuuuuuuuuuuuuuuuuuwoopuuuuuuuu
explain how to find the mass of water. show your calculations as well
Answer:
You can find the mass of water by multiplying the density of water by its volume.
mass = Density x volume
Explanation:
It is very easy to find the mass of water once you know the formula of density. "Density" refers to mass per unit volume.
Density (ρ) = [tex]\frac{mass}{volume}[/tex]
Therefore, mass = ρ x volume
The density of water is 1 kg/L.
For example, if the volume of water is 500 ml, then you can get its mass by multiplying 500 ml by 1 kg/L.
Let's convert 500 ml to Liter first.
500 ml x [tex]\frac{1 L}{1,000 ml}[/tex] = 0.5 L
Now, let's compute.
mass = ρ x volume
mass = 1 kg/L x 0.5L
mass = 0.5 kg
The mass of a 500-ml water is 0.5 kg.
8.0 dm of NO is mixed with 6.0 dm3 of O, at room temperature and pressure (RTP).
The reaction below takes place until one of the reactants is used up.
2NO(g) + O2(g) + 2NO,(9)
What is the volume of the mixture at RTP after the reaction has taken place?
A)8.0 dm3
B)10.0 dm3
C)12.0 dm3
D)14.0 dm3
Answer:
B)10.0 dm3
Explanation:
Now we have to apply Gay-Lussac's law which states that gases combine in simple volumes provided the temperature and pressure remain constant.
2NO(g) + O2(g) ------>2NO
combining volumes 2 : 1 : 2
Volumes before reaction 8.0 6.0 0.0
Reacting volumes 8.0 4.0 8.0
Volumes after reaction - 2.0 8.0
Therefore;
Total volume after reaction = 2.0 + 8.0 = 10.0 dm^3
The volume of the mixture after the reaction is 10 dm³
The correct answer to the question is Option B. 10 dm³
The above is simply a demonstration of Gay-Lussac' law. The volume of the mixture after the reaction can be obtained as follow:
2NO(g) + O₂ —> 2NO(g)
Combining Vol: 2 dm³ : 1 dm³ : 2 dm³
Before reaction: 8 dm³ : 6 dm³ : 0
During reaction: 8 dm³ : 4 dm³ : 8 dm³
After reaction: 0 dm³ : 2 dm³ : 8 dm³
The Volume after the reaction = 2 + 8 = 10 dm³
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How will the calcium atom shown below achieve an octet if it takes part in an ionic bond?
a
The calcium atom will gain 8 electrons.
b
The calcium atom will lose 6 electrons.
c
The calcium atom will gain 2 electrons.
d
The calcium atom will gain 20 electrons.
e
The calcium atom will gain 6 electrons.
f
The calcium atom will lose 8 electrons.
g
The calcium atom will lose 20 electrons.
h
The calcium atom will lose 2 electrons.
Answer:
It will lose 2 electrons
Explanation:
Here we have a calcium atom, which has 20 electrons.
Those 20 electrons are in 4 shells. (2-8-8-2)
Saying there are 2 electrons in the valence shell (Shell N), to get to an octet with an ionic bond (with a group 16 element), those 2 electrons will have to go.
multiple choice-- please help!
Study the chemical reaction.
A ⟶ B + C
This reaction is second order in A.
What is the rate law for this reaction?
Rate = K [B][C]^2
Rate = K [A]^2
The rate law for the reaction : r=k.[A]²
Further explanationGiven
Reaction
A ⟶ B + C
Required
The rate law
Solution
The rate law is a chemical equation that shows the relationship between reaction rate and the concentration / pressure of the reactants
For the second-order reaction it can be:
1. the square of the concentration of one reactant.
[tex]\tt r=k[A]^2[/tex]
2. the product of the concentrations of two reactants.
[tex]\tt r=k[A][B][/tex]
And the reaction should be(for second order) :
2A ⟶ B + C
Thus, for reaction above (reactant consumption rate) :
[tex]\tt r=-\dfrac{\Delta A}{2\Delta t}=k[A]^2[/tex]
How do the trillions of cells in the human body get what they need to function
Conservation of mechanical energy is defined as
(a) Energy of motion
(b) Law of conservation of energy
(c) The sum of the kinetic and potential energies of an object remain a constant value unless there are forces acting on the object that cause a loss of energy overall, such a friction and air resistance.
(d) Potential energy added to kinetic energy
How many significant figures does 0.09749000 have
Answer:
Number of Significant Figures: 7
Explanation:
The Significant Figures are 9 7 4 9 0 0 0. Remember: the first zeros don't count!
A student spends 4.5 hours studying for a test. How much time is this equivalent to in seconds
Select one:
a)2,700 seconds
b)16,200 seconds
c)270 seconds
d)6,480 seconds
Write the name and symbol of the ion formedwhen a sulfur atom gains two electrons. a.an aluminum atom loses three electrons. b.a nitrogen atom gains three electrons. c.a calcium atom loses two electrons.
Answer:
SULFUR: S²-
ALUMINIUM: Al³†
NITROGEN: N³-
CALCIUM: Ca²†