Answer:
Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. It presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution.
What are Ion formations?
Answer:
Ions are formed when atoms lose or gain electrons, with the metal transferring electrons to the outermost shell of the non-metallic atom
Our Sun will eventually turn into a red giant and, finally, a white dwarf. Use the Hertzsprung-Russell diagram to describe how the Sun's luminosity and temperature will change as it goes through these stages.
Answer:
Most stars are rather simple things. They come in a variety of sizes and temperatures, but the great majority can be characterized by just two parameters: their mass and their age. (Chemical composition also has some effect, but not enough to change the overall picture of what we will be discussing here. All stars are about three-quarters hydrogen and one-quarter helium when they are born.)
In the chemical reaction 2CO(g) + O2 —-> 2CO2 if you react 55.0g of oxygen gas you would expect to produce what volume of carbon dioxide at stp
Answer:
13mL of CO₂ are produced
Explanation:
Based on the chemical reaction:
2CO(g) + O₂(g) → 2CO₂(g)
Where 1 mole of O₂ in excess of CO produce 2 moles of CO₂}
Thus, to solve this problem we need to convert the mass of oxygen gas to moles and, using the chemical reaction we can find the moles of CO₂ and its volume at STP:
Moles O₂ -Molar mass: 32g/mol-
55g O₂ * (1mol / 32g) = 1.72 moles O₂
Moles CO₂:
1.72 moles O₂ * (2 moles CO₂ / 1mol O₂) = 3.44 moles CO₂
Volume:
PV = nRT
V = P / nRT
Where P is pressure = 1atm at STP
n are moles = 3.44 moles of CO₂
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K at STP
V = 1atm / 3.44mol*0.082atmL/molK*273.15K
V = 0.0130L = 13mL of CO₂ are produced
the periodic table of elements has all the elements except for...?
Answer:
In the periodic table of the elements, it is expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized.
...
what type of rock can be found on the slopes of Mt. St. Helens?
Answer:
lava rock
Explanation:
Mt. St. Helens is an active volcano
Answer:
IGNEOUS
Explanation:
Igneous rock, is a rock in which is formed from molten rock and lava. The Mt st helens, is a volcano in which had spurred lava at one point converting these rocks into igneous rocks!
hope this helps! brainliest? :)
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. H2 + O2 --> H2O
b. CH4 + O2 --> CO2 + H2O
c. NaI + Br2 --> NaBr + I2
d. H2CO3 --> H2O + CO2
Answer:
C
Explanation:
Single replacement reactions is when only one element gets replaced / changed. This usually looks like this: A + BC = B + AC or A + BC = C + AB
Therefore, the number of reactants must be equal to the number of products, since no actual combinations / break ups are occurring.
Answers A and D are eliminated right away since the number of products don't equal the number of reactants.
Answer B is wrong because it does not show simply one element being replaced, instead, two compounds are being formed. It doesn't look like the example given.
Only answer C shows that one element is replaced:
The iodine is replaced with bromine to form NaBr + I2
The chemical equation NaI + Br₂ --> NaBr + I₂ is an example of single replacement reaction.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Please help with this
Dax has been learning about chemical reactions, and he now understands that chemical reactions occur at different rates. Some are very fast, while others are quite slow. Depending on the conditions, a particular reaction can happen at different rates. Describe the conditions that affect the rate of a chemical reaction
Answer:
concentrationtemperaturesurface area (for solid reactants ONLY)pressure (for gaseous reactants ONLY)catalystExplanation:
Concentration- rate of the reaction increases with the increase of concentration of the reactants. More particles per unit volume leads to the frequency of collisions to increase. The number of successful collisions thereby increase and overall, lesser time is needed to complete the reaction (upon a higher concentration)Temperature- With the increase of temperature, rate of reaction increases. Particles have more kinetic energy and they move faster. Due to this, number of successful collisions increases/number of effective collisions increases. More particles have energy greater than the activation energy and, activation energy can't change. If number of moles are changed, then number of product will vary.Surface Area- Rate of reaction increases with the increase of surface area of the solid reactant. More particles are exposed to react and the frequency of collisions increases. Less time is needed to complete the reaction and with the decrease of size, surface area increases.Pressure- Rate of reaction increases with the increase of pressure of the gaseous reactants. Gas molecules are closer/ more particles per unit volume is found. The frequency of collisions increase and number of effective collisions increases.Catalyst- Substances which can speed up a chemical reaction by lowering the activation energy by creating an alternative route are called catalysts. They take part in a chemical reaction but after the reaction, they remains chemically unchanged. Catalysts can change the value of enthalpy change and increases both forward and backward reaction rates. They can't change the yield of a chemical reaction and can't change the equilibrium composition. (ex: usage of Vanadium (V) Oxide to manufacture sulfuric acid).Any factor that increases the Collison rate definitely increase the rate of reaction, concentration, temperature, surface area, pressure and catalyst are the major factor that affect the rate of reaction.
What is rate of reaction?The rate of reaction is the study of change of concentration of reactant or product with respect to time.
There are so many factors that affect the rate of reaction
1)concentration: As the concentration of reactant increases the number of collisions increases so rate of reaction also increases.
2)temperature: As the temperature increases the movement of gaseous molecule increases hence the Collison rate increases and hence the rate.
3)surface area (for solid reactants ONLY): As the surface area of the catalyst increases, more molecule can sit on the reactive site hence more is the rate of reaction.
4)pressure (for gaseous reactants ONLY): As pressure increases the randomness increases and hence the Collison and hence the rate of reaction
5)catalyst: Catalyst increase the rate of reaction as they decrease the activation energy
Thus concentration, temperature, surface area ,pressure and catalyst are the factor that increases rate of reaction
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Bromine and nitrogen combine to form nitrogen tribromide (NBr3). How many liters of NBr3 gas are produced when 6.85 L of bromine reacts with excess nitrogen? Assume conditions are at STP.
Answer:
4.567 ltr
Explanation:
both are gases
so
N2 +Br2 =NBr3
balancing
N2 +3B2 = 2 NBr3
now
3 litr of B2 gives 2 liter of NBr3
6.85 litr of B2 gives 2/3 *6.85 litr NBr3 = 4.567ltr
Solve this word problem:
What would happen to the
acceleration of a rock that has a mass
of 3 kg and a force of 1 N if you
double the force applied?
Answer:
The new acceleration becomes twice the pervious acceleration.
Explanation:
Given that,
Mass of the rock, m = 3 kg
Force, F = 1 N
We know that the force acting on an object is given by :
F = ma
a is acceleration of the rock
Put m = 3 kg and F = 1N,
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{1}{3}\ m/s^2[/tex]
If the force is doubled, F' = 2 N
So,
F'=ma'
[tex]a'=\dfrac{F'}{m}\\\\a'=\dfrac{2\times 1}{3}\\\\a'=\dfrac{2}{3}\\\\a'=2\times \dfrac{1}{3}\\\\a'=2a[/tex]
So, the new acceleration becomes twice the initial acceleration.
[QUESTION TO EVERY SCARY MOVIE FANATIC] What is the most scary movie you ever seen? If you did see the most scary movie ever, what made it so scary for you?
Answer:evil dead 2013
Explanation:
this movie smack
Answer:
So I watched the purge which wasn't scary at all right but I watched the Nun and Anebeklle the conjuring and my cousin said that the Nun was the one possessing Anebelle after she was killed by the father of the girls during the purge and some other demon took over the Nuns soulless body since she had decided to possess the doll and the demon that possessed the Nun was Anabelle's previous owner and after hearing that I kept thinking about it for multiplretimes but I finally got over it 2 years ago.
xplanation:
what is a solid? what makes something a liquid?
Answer:
In matter a solid is anything that retains its shape and density when not confined.
a liquid is made up of a tiny particles of matter such as atom and it is also able to flow and take up a shape of any container.
Which substance is a reactant(s)
O2 only
MgO only
Mg and O2
Mg only
What is the chemical formula for aloe vera gel (or just aloe vera)?
Answer:
Aloeride is a polysaccharide that comprises only 0.015% of the crude A. vera juice material (dry weight). It has a molecular weight between 4 and 7 million Da with its glycosyl components containing glucose (37.2%), galactose (23.9%), mannose (19.5%) and arabinose (10.3%).
Answer:
Aloeride is a polysaccharide that comprises only 0.015% of the crude A. vera juice material (dry weight). It has a molecular weight between 4 and 7 million Da with its glycosyl components containing glucose (37.2%), galactose (23.9%), mannose (19.5%) and arabinose (10.3%).
Explanation:
Please help fast, I will give brainliest!
Determine the empirical and molecular formula for chrysotile asbestos. Chrysotile has the following percent composition: 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O. The molar mass for chrysotile is 520.8 g/mol
The empirical and molecular formula : Mg₃Si₂H₂O₈ and Mg₆Si₄H₄O₁₆
Further explanationGiven
28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O
Required
The empirical and molecular formula
Solution
Mol ratio : Mg : Si : H : O =
[tex]\tt \dfrac{28.03}{24}\div \dfrac{21.6}{28}\div \dfrac{1.16}{1}\div \dfrac{49.12}{16}\\\\1.17\div 0.771\div 1.16\div 3.07\\\\1.5\div 1\div 1.5\div 4\\\\3\div 2\div 2\div 8[/tex]
So empirical formula :
[tex]\tt Mg_3Si_2H_2O_8[/tex]
(Emprical formula)n=molecular formula
(Mg₃Si₂H₂O₈)n=520.8
(24.3+28.2+2.1+8.16)n=520.8
(258)n=520.8⇒n=2
The molecular formula : Mg₆Si₄H₄O₁₆
Match each type of learning to the correct definition
trial-and-error learning
the process of performing a behavior more
and more skillfully
imprinting
insight learning
the process of associating a stimulus with a
good or bad outcome
a bond to an individual or object shortly after
birth or hatching
the process of using prior knowledge to
solve a problem
conditioning
Answer:
conditioning-the process of associating a stimulus with a good or bad outcome.
trial-and-error learning-the process of performing a behavior more and more skillfully.
insight learning-the process of using prior knowledge to solve a problem.
imprinting-a bond to an indivisual or object shortly after birth or hatching.
Explanation:
Did this assignment.
Answer:
Insight learning=2 one
conditioning=4th one
Imprinting=1st one
Trial-and-error learning=3rd one
(If urs is not in the same order here is the written one)
Insight learning-the process of using prior knowledge to solve a problem
Conditioning-the process is associating a stimulus with a good or bad outcome
Imprinting-a bond an individual or object shortly after birth or hatching
Trial-and-error learning-the process of performing a behavior more and more skillfully.
Explanation: hope it helps got it right on edu 2021
What is the balanced chemical equation for the reaction of aqueous sodium hydroxide and sulfuric acid?
Select one:
a.NaOH(aq) + H2SO4(aq) = H2O(l) + NaSO4(aq)
b.NaOH(aq) + H2SO4(aq) = H2O(l) + Na(SO4)2(aq)
c.2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)
d.NaOH(aq) + H2SO4(aq) = H2O(l) + Na2SO4(aq)
Answer:
c. 2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)
Explanation:
The reaction of a strong acid as H2SO4 and a strong base as NaOH produce water, H2O, and the salt, Na2SO4:
H2SO4(aq) + NaOH(aq) → H2O(l) + Na2SO4(aq) -Unbalanced reaction-
To balance the sodium atoms:
H2SO4(aq) + 2 NaOH(aq) → H2O(l) + Na2SO4(aq)
And, to balance hydrogen:
H2SO4(aq) + 2 NaOH(aq) → 2H2O(l) + Na2SO4(aq)
Thus, right option is:
c. 2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)The ion that is formed when alkalis dissolve in water is
A:h+
B:OH+
D: Na-
C:Cl-
Answer:
OH- as alkalis produce hydroxide ions when dissolve in water
What’s the balance?
Fe + O2 > Fe2 O3
Explain pls
Answer:
Fe = 4 O=6
O = 6 Fe = 4
Explanation:
Fe + O2 > Fe2 O3
4Fe + 3O2 > 2Fe2 O3
Check
Fe = 4 Fe = 4
O = 6 O = 6
This is the balance equation.
A pipe leaks water at a rate of 1.24 mL/s. What is the rate of the water leak in L/hr?
Select one:
a)0.344 L/hr
b)4.46 L/hr
c)0.0744 L/hr
d)20.7 L/hr
Answer:
b)4.46 L/hr
Explanation:
To solve this question we need to convert the mL to liters (Using the conversion of 1000mL = 1L) and convert the time from seconds to hours (3600s = 1hr)
mL to L:
1.24mL/s * (1L / 1000mL) = 0.00124L/s
seconds to hours:
0.00124L/s * (3600s / 1hr) = 4.46L/hr
Right answer is:
b)4.46 L/hrWhich organisms use cellular respiration as a way to convert energy into usable form?
Answer:they use cellular respiration to transform the glucose molecules they make into energy they can use for carrying out life's processes
Explanation:
I'm really confused on this question, pls help
I clean six ninths in my room and my friend clean two ninths in my room how much of my room do we still have the queen
Answer:
1 ninth of the room
Explanation:
The threshold frequency for metallic potassium is 5.46×1014s-1 calculate the maximum kinetic energy and velocity that the emitted electron has the wave length of light shining on the potassium surface is 350nm(Me=9.11×1031kg)
Given :
The threshold frequency for metallic potassium is 5.46×1014 s⁻¹.
To Find :
The maximum kinetic energy and velocity that the emitted electron has the wave length of light shining on the potassium surface is 350 nm.
Solution :
We know, Maximum kinetic energy is given by :
[tex]K.E = \dfrac{hc}{\lambda}-h\nu_o\\\\K.E = h \times( \dfrac{3\times 10^8}{350\times 10^{-9}} -5.46\times 10^{14} )\\\\K.E = 6.626 \times 10^{-34}\times ( \dfrac{3\times 10^8}{350\times 10^{-9}} -5.46\times 10^{14} )\\\\K.E = 2.06 \times 10^{-19}\ J[/tex]
Hence, this is the required solution.
The kinetic energy of the electrons is 2.1 × 10^-19 J while the velocity of the electron is 6.78 × 10^5 m/s.
The work function of the metal is obtained as follows;
Wo = hfo
Wo = work function
h = Plank's constant
fo = threshold frequency
Wo = 6.63 × 10^-34 Js × 5.46 × 10^14 s-1 = 3.6 × × 10^-19 J
The energy of the incident photon is obtained from;
E = hc/λ
E = energy of incident photon
h = Plank's constant
c = speed of light
λ = wavelength of photon
E = 6.63 × 10^-34 Js × 3 × 10^8/350 × 10^-9
E = 5.7 × 10^-19 J
From the Einstein equation;
KE = E - Wo
KE = 5.7 × 10^-19 J - 3.6 × 10^-19 J = 2.1 × 10^-19 J
Since;
KE = 1/2mv^2
v = √2KE/m
v = √2 × 2.1 × 10^-19 J/9.11 × 10^-31kg
v = 6.78 × 10^5 m/s
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How many liters of NH3 can be produced from the reaction of 6.57L of N2 with an excess of H2?
N2 + H2–-> NH3
Answer:
13.14L
Explanation:
The reaction expression is given as:
N₂ + 3H₂ → 2NH₃
The given reaction is not balanced and we have balanced it as shown above in the reaction.
N₂ + 3H₂ → 2NH₃
Based on the Avogadro's law, equal volume of all gases contains the same number of molecules at the same temperature and pressure.
1 L of N₂ will produce 2L of NH₃
So 6.57L of N₂ will produce 2 x 6.57 = 13.14L of NH₃
3.
Iron can be produced when iron (III) oxide reacts with carbon monoxide gas.
Fe2O3 (s) + 3C0 (g) → 2 Fe (s) + 3CO2(g)
11.5 g of Fe2O3 reacts with 2.63 x 10 24 molecules of CO. What mass of Fe is
expected? [10]
Answer: 23 g
the mol of Fe is 11,5/56 = 23/112 (mol)
the mol of CO is [tex]\frac{2,63.10^{24} }{6.10^{23} }= \frac{263}{60}[/tex] (mol)
we have:
Fe2O3 + 3CO => 2Fe + 3CO2
23/112 69/112 23/56
=> the mol of Fe is 23/56 mol
=> the mass of Fe is 23/56.56 = 23 (g)
Explanation:
What are Convection currents powered by?
Answer:
They are powered by the heat deep within the earth.
Explanation:
Which quantity is equivalent to 1 millisecond?
A.
0.1 second
B.
1,000 seconds
C.
0.001 second
D.
100 seconds
Answer:
C. 0.001 second
Explanation:
Millisecond is a subunit of a second.
Milli depicts a unit to the power of 10⁻³
So;
1 millisecond = 10⁻³ s
Therefore,
1 x 10⁻³ = 0.001s
The solution to this problem is choice C which is 0.001 second
how are cells produced through mitosis and meiosis different?
A.They have different cell shapes.
B.They have different numbers of chromosomes
C.They have different levels of activity in the ribosomes
D. They have different components in the cell membrane
Answer:
Explanation:
I think b
