Answer:
survival
Explanation:
Organisms actually compete for food , water and slot but all this things lead to survival . so organisms are actually competing for survival
How many iron atoms are in Fe2O3?
Answer:
2 iron atoms in Fe2O3
A car travels at 60 m/s for 8 seconds. Calculate the distance it traveled.
480 meters
hope this helped!
what is the mass of 0.200 mol of calcium
How
many
molecules are in 8.55x10-15 moles of a substance
Answer:
Know this
1mole of a substance contains 6.022x10²³molecules
Now
8.55x10^-15moles x 6.022x10²³molecules/1mole
=5.15x10^9molecules.
Brakes are to a car as
to a nuclear-fission chain reaction.
A. fuel rods are
B. proliferation is
C. free neutrons are
D. control rods are
Answer:
D. control rods are
I hope dis helps :3
Brakers are to a car as control rods are to a nuclear-fission chain reaction. The correct option is D.
What is a nuclear-fission chain?A chain reaction occurs when neutrons generated during fission cause subsequent fission in at least one more nucleus.
This nucleus creates neutrons, and the cycle continues.
The process can be either controlled (nuclear power) or uncontrolled (nuclear weapons) (nuclear weapons).
Thus, the correct option is D. control rods are.
Learn more about nuclear-fission chain
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What would be the volume, in liters measured at STP, of 9.75 moles of carbon monoxide?
I
How does the composition of the nucleus change during fission, fusion, and radioactive decay?
The composition and mass of the nucleus changes during fission, fusion and nuclear decay process. During fission the nuclei breaks to light nuclei and in fusion the mass of nuclei formed is increased and in radioactive decay, the nuclear mass decreases.
What is nuclear fission?Nuclear fission is the process of breaking of a heavy nucleus into light nuclei with the release of energy. Hence, fission changes the identity of the atomic nuclei and form to light nucleus.
In nuclear fusion, two light nuclei fused up to form a heavy nucleus. Hence, the new composition changes the identity of the product. The number of protons, neutrons or electrons are differed in both fusion or fission.
Radioactive elements undergo nuclear decay by the emission of charged particles and it will reduce the atomic number or mass number or both based on the type of decay.
To find more on radioactive decay, refer here:
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3. 7moles of Ba(NO3)2 is dissolved in 75kg of distilled water.
What is the boiling point of this solution? Hint: Find molality first.
Answer:
100.14°C
Explanation:
The boling point elevation is a colligative property that describes the increasing in boiling point of a solution regard to the boiling point of the pure solvent. The equation is:
ΔT = Kf*m*i
Where ΔT is boiling point elevation
Kf is boiling point elevation (0.51°C/m for water)
m is molality of the solution (7moles Ba(NO3)2 / 75kg = 0.09333m
i is Van't Hoff factor = 3 for Ba(NO3)2 (Because its dissolution produce 3 ions = Ba²⁺ and 2 NO₃⁻
Replacing:
ΔT = 0.51°C/m*0.09333m*3
ΔT = 0.14°C is the boiling point elevation
As the boiling point of water is 100°C, the boiling point of the solution is:
100°C + 0.14°C =
100.14°C
Calcula cuantos mililitros de oxigeno se necesitan para quemar 3.5 ml de C₆H₆ a CNTP, la reacción sin balancear es la siguiente: C₆H₆ + O₂ → CO₂ + H₂O
Answer:
[tex]26.25mL \ O_2[/tex]
Explanation:
¡Hola!
En este caso, dado que se nos da reacción de combustión del benceno, primero debemos balancearla como se muestra a continuación:
C₆H₆ + ¹⁵/₂ O₂ → 6CO₂ + 3H₂O
Vemos que hay una relación molar entre el benceno y oxígeno de 1:¹⁵/₂, por lo que la relación de volúmenes es:
[tex]3.5 mL\ C_6H_6*\frac{15/2\ mL\ O_2}{1mL\ C_6H_6} \\\\=26.25mL \ O_2[/tex]
¡Saludos!
Please help me out!!!
Larissa is making sautéed purple cabbage. First, she washes and cuts the cabbage into long thin strands. Then, she puts a pan on the stove and adds butter. She allows the butter to melt and turn to liquid. Next, she adds the cabbage to the butter, sprinkles some salt on it, and stirs it. Larissa watches as the cabbage sizzles, releases steam, and softens. To finish the side dish, she adds a squeeze of lemon juice to it, which causes it to change from purple to pink. Finally, Larissa empties the cabbage into a bowl and puts it on the dinner table.
Which of the events involves a chemical reaction?
Larissa washes and cuts some purple cabbage into long thin strands.
Larissa adds the cabbage to the butter with a sprinkle of salt and stirs it.
Larissa adds butter to a pan and allows it to melt and turn to liquid.
Larissa adds a squeeze of lemon juice to the cabbage, and it turns pink.
Larissa empties the cabbage into a bowl and puts it on the dinner table.
Larissa watches as the cabbage sizzles, releases steam, and softens.
Answer:
what even is the question?
PLS HELP ASAP NO LINKS PLS
If a person wanted to engineer a new type of communication device, what field of study would be the most useful?
chemical engineering
electrical engineering
optical engineering
mechanical engineering
Answer:
electrical and mechanical engineering
Answer:
electrical engineering
Explanation: i took quiz
What word describes different compounds which are found together but not combined chemically?
A compound contains two or more elements chemically joined together. A mixture contains two or more different substances that are not chemically joined together. The different substances in a mixture can be elements and/or compounds.
Alex built a model to show how light bends when placed into water. To do this, Alex filled a fish tank up with water, and shined a green laser through the water. The angle he shined the laser into the fish tank is the line above the water, and the angle that the light bent is seen below the water. What is a limitation of this model? The model cannot show how light bends. The model is unable to use different colors of light The model cannot calculate the speed of light The model is not 3 dimensional
Answer:
The model cannot show how light bends.
Explanation:
How would you find the density of a can of soda pop?
A. Find the mass of the can of soda pop and then multiply by the number of cubic centimeters in the can
B. Find the mass of the can of soda pop and then divide by the number of cubic centimeters in the can
C. Convert a gallon into cubic centimeters and then divide by the mass of the can of soda pop
D. Convert a gallon into cubic centimeters and then subtract the mass of the can of soda pop
Answer:
it's A.
Explanation:
have uh good day ma :)))))))
Which solution will provide the LOWEST freezing point? Group of answer choices 1.2 M MgCl2 1.60 M KI 1.0 M Na2CO3 1.5 M NaCl
Answer:
KI 1.0 M
Explanation:
Freezing point of a substance is a colligative property. This means that it depends on the amount of substance present is the system.
The freezing point is given by; T - Ta = K * m * i
Where;
T = freezing point of the pure solution
Ta = freezing point of the solution containing the solute
K = freezing point constant
m = molality of the solution
i= Van't Hoff factor
If we look at all the options provided, KI has only two particles in solution and a molality of 1.0 m hence it should exhibit the lowest freezing point of solution.
HELP ASAP!! 12pts!
What is the molarity of an aqueous solution containing 7.5 moles of
calcium chloride in 12.75 L of solution?
A. 0.59 M
B. 1.7M
C. 7.5M
D. 95.6 M
Answer:
The correct answer is 0.59M
Calculate the mass of Iron in 40g of Fe203
Answer:
Explanation:
What is the standard atomic notation for an atom that has an atomic number of 4 and has 5 neutrons
Blank O2 + blank Mg arrow blank MgO
Select the coefficients that balance the equation:
MgO *
A) 1,1,1
B) 1,2,2
C) 2,3,4
D) 1,4, 2
Answer:
its a
Explanation:
a
¿Cómo se llama el grupo IIA de la tabla periódica?
Answer:
los metales alcalinotérreos: berilio (Be), magnesio (Mg), calcio (Ca), estroncio (Sr), bario (Ba) y radio (Ra).
o simplemente llamado grupo 2A
Explanation:
When iron combines with oxygen in a moist environment, rust forms because of a
A.
change in density.
B.
chemical reaction.
C.
change in temperature.
D.
physical reaction.
Students performed an investigation on how aluminum cans taken to a recycle center were able to be reused. They found out an aluminum can undergoes which type of change?
A.
a physical change because the material remains the same
B.
a chemical change because new metal is formed
C.
a physical change because the can is heated
D.
a chemical change because an old can is changed into a new can
Which of the following is an example of a compound?
A.
carbon
B.
copper
C.
water
D.
iron
A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon dioxide provided evidence that
A.
only a loss of mass occurred.
B.
only a physical change occurred.
C.
the formation of an element occurred.
D.
a chemical change occurred.
As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?
A.
a cake that was baked from many ingredients
B.
using heat to burn a log in a fireplace
C.
using light to produce sugar in plants
D.
a bottle that was broken into many small pieces
What is formed when a sodium atom and chlorine atom react chemically?
A.
an electron
B.
a neutron
C.
a compound
D.
an element
Which substance is composed of only one type of atom?
A.
salt
B.
water
C.
gold
D.
sugar
A mixture that has the same composition throughout is what kind of mixture?
A.
Taco Salad
B.
Heterogeneous
C.
Sharknado
D.
Homogeneous
John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and salt was visible at the bottom of the jar. This is an example of a
A.
solute being dissolved.
B.
chemical change.
C.
new substance being formed.
D.
physical change.
Which term correctly describes all of the following materials?
salt water, vinegar, bronze, air, beach sand
A.
solutions
B.
mixtures
C.
compounds
D.
elements
In which classification of matter are the components chemically combined?
A.
alloy
B.
compound
C.
mixture
D.
colloid
Since sodium chloride is classified as a compound, a sample of it contains
A.
matter that cannot be reduced to atoms.
B.
atoms that are gases, liquids, and solids.
C.
a solution of atoms and molecules.
D.
more than one kind of atom.
Which is the best example of a chemical change?
A.
paper tearing
B.
butter melting
C.
egg cooking
D.
water evaporating
Which is a physical change?
A.
rust forming on an iron fence
B.
a copper roof changing color
C.
a sheet of paper shredding
D.
a piece of wood burning
What is needed to change ice into water?
A.
stirring
B.
energy
C.
chemicals
D.
air
A group of students observed the formation of bubbles when water boiled. What happened to matter because of the physical change to the water?
A.
Matter was conserved when it changed form.
B.
New matter was created in the bubbles.
C.
Old matter was destroyed as the water turned to gas.
D.
The composition of the matter changed.
Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?
A.
a compound
B.
a solution
C.
a precipitate
D.
a mixture
What is the smallest unit of an element that still retains the element’s properties?
A.
an atom
B.
a crystal
C.
a molecule
D.
a proton
Which type of matter can be separated by physical means?
A.
compound
B.
element
C.
mixture
D.
atom
Which state has a definite shape and volume?
A.
Sharknado 2: The Second One
B.
Gas
C.
Solid
D.
Liquid
Answer:
A. change in density.
What will the change in temperature be when 90 J are applied to 15 g of gold. (Cgold = 0.126 J/gºC)
Round your answer to the nearest whole number.
°C
E
3
4
5
Next
O
I 17
Answer:
48 °C
Explanation:
q = 90J
m = 15 g
C = 0.126 J/gºC
q = mct
90 = (15)(0.126)t
t = 47.62 °C = 48 °C
Answer:
Explanation:
Formula
E = m * c * Δt
Δt is what you seek.
Givens
E = 90 joules
m = 15 grams
c = 0.126
Solution
90 = 15 * 0.126 * Δt Divide by 15
90/15 = 15/15 * 0.126 * Δt
6 = 0.126 * Δt Divide by 0.126
6/0.126 = Δt
47.619 = Δt
Δt = 48 oC
A hot object will have ___ kinetic energy
Answer:
More/ Alot? I think is what you are looking for?
Explanation:
It will definitely have some but I'm not sure on what word you are looking for.
why dil. sulphuric acid cannot be used instead of dil.hcl in lab preparation of carbon dioxide gas?
Answer:
Because Sulphuric acid(H2SO4) is one of the substance which have a very high vigourous reaction if mix with chemicals thats why we take the same sulphuric acid but having lighter effects known to be as Dil.Sulphuric And so it is generally use for precaution while during experimentations Thats why we use it.
Hope it helps
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H,
and 51.12% O. What is the molecular formula for glycerol?
Answer:
Molecular formula => C₃H₈O₃
Explanation:
From the question given above, the following data were obtained:
Carbon (C) = 39.12%
Hydrogen (H) = 8.75%
Oxygen (O) = 51.12%
Molar mass of compound = 92.09 g/mol
Molecular formula =?
Next, we shall determine the empirical formula of the compound. This can be obtained as follow:
C = 39.12%
H = 8.75%
O = 51.12%
Divide by their molar mass
C = 39.12 / 12 = 3.26
H = 8.75 / 1 = 8.75
O = 51.12 / 16 = 3.195
Divide by the smallest
C = 3.26 / 3.195 = 1
H = 8.75 / 3.195 = 2.7
O = 3.195 / 3.195 = 1
Thus, the empirical formula is CH₂.₇O
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:
Empirical formula = CH₂.₇O
Molar mass of compound = 92.09 g/mol
Molecular formula =?
Molecular formula = Empirical formula × n
Molecular formula = [CH₂.₇O]ₙ
92.09 = [12 + (2.7×1) + 16] × n
92.09 = 30.7n
Divide both side by 30.7
n = 92.09 / 30.7
n = 3
Molecular formula = [CH₂.₇O]ₙ
Molecular formula = [CH₂.₇O]₃
Molecular formula = C₃H₈O₃
Balance the following Chemical Equation:
NaBr +CaCl2-> NaCl+ CaBr2
Alanna spots a bird in her back yard. The bird is sitting on a tree. Explain how the outer coverings of the bird and tree are different and have different functions.
Answer:
A bird's feathers are supposed to keep the bird warm and help them fly. A tree's bark is supposed to protect the inside of the tree.
Explanation:
If a tree has no bark, the inside of it is exposed. If a bird has no feathers, the bird is cold and cant fly.
The total pressure of two unknown gases is 5 kPa. The partial pressure of one of the gases is 2.345 kPa, what is the partial pressure of the other gas?
Answer:
[tex]p_2=2.655kPa[/tex]
Explanation:
Hello there!
In this case, according to the Dalton's law, which states that the total pressure is equal the sum of the pressures of the gases in the mixture, we write the following for this system:
[tex]P_T=p_1+p_2[/tex]
Thus, we solve for the partial pressure of the gas #2 as shown below:
[tex]p_2=P_T-p_1\\\\p_2=5kPa-2.345kPa\\\\p_2=2.655kPa[/tex]
Best regards!
4. A blue light is shined on objects X and Y. Object X appears to be blue, and object Y appears to
be black. Which of the following is correct?
A. Object X absorbs blue light, and object Y reflects blue light.
B. Object X reflects blue light, and object Y absorbs blue light.
C. Object X must be black, and object Y must be blue.
D. Object X must be blue, and object Y must be black.
A blue light is shined on objects X and Y. Object X appears to be blue, and object Y appears to be black when Object X reflects blue light, and object Y absorbs blue light. Hence option B is correct.
What is light ?Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.
When we pass white light through a prism, as white light enters in the prism all the colors having different wavelength travels with different velocity in the prism due to that there is separation of colors from the white light. Therefore we get different colors of white light in the prism this phenomenon is know as dispersion of light.
Light can be reflected, absorbed, transmitted diffracted and scattered etc.
α + β + ν = 1 where α, β, ν are coefficient of absorption, reflection and transmission.
When any object appears to be black it means that radiation has been absorbed by that body, it has high absorption coefficient. and when a body appears to be colored, it means that object has reflected the particular color, it having high reflection coefficient.
Hence option B is correct.
To know more about light :
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For many purposes, we can treat propane (C3H8) as an ideal gas at temperatures above its boiling point of -24C Suppose the temperature of a sample of propane gas is lowered from 14.0c to -1.0c and at the same time the pressure is changed.
If the initial pressure was0.75 kPa and the volume decreased by55.0% what is the final pressure? Round your answer to the correct number of significant digits.
it's 75 k bro thats the answer