Which phrase justifies why the theory of evolution is a theory and not a law?
1. Describes the relationship between an organism and its environment
2. Makes accurate predictions based on only a small amount of empirical evidence
3. Explains diversity based on the principle of natural selection
4. Cannot be modified with the discovery of new evidence
Answer:
2. Makes accurate predictions based on only a small amount of empirical evidence
Explanation:
For a phrase or scientific finding to be considered a law, there has to be clear evidence and facts to support that specific finding. In the case of the evolution theory, the evidence is not clear enough to make it a law
Answer:
2. Makes accurate predictions based on only a small amount of empirical evidence
Explanation:
A nuclear reaction in which the nuclei of atoms join together is called nuclear fission.
true or false
Answer:
That is true!
Explanation:
A species of kangaroo has a diploid chromosome number of 16. After meiosis, to develop the kangaroo’s sperm or egg, the haploid number would be
. When fertilization occurs, the zygote would again have 16 chromosomes.
Answer:
Just to prove that the persons answer on top of mine is correct :D
Explanation:
Answer:
Explanation:
8
For the reaction Halg) + 12/8) = 2HI(g), K = 50.2 at 445°C. If
[H2] - [62] - [HI] = 1.75 x 10 Mat 445°C, which of the
following is true based on the above?
Qc
equilibrium
Qc - Kc, the reaction is currently at equilibrium
Qc > Kc, the reaction proceeds from left to right to reach
equilibrium
QC > Ke the reaction proceeds from right to left to reach
equilibrium
C) Qc < Kc, the reaction proceeds from left to right to reach equilibrium
Further explanationGiven
K = 50.2 at 445°C
[H2] = [I2] = [HI] = 1.75 × 10⁻³ M At 445ºC
Reaction
H2(g) + I2(g) ⇔2HI(g)
Required
Qc
Solution
Qc for the reaction
[tex]\tt Qc=\dfrac{[HI]^2}{[H_2][I_2]}\\\\Qc=\dfrac{(1.75.10^{-3})^2}{1.75.10^{-3}\times 1.7\times 10^{-3}}=1[/tex]
Qc < Kc ⇒ reaction from left(reactants) to right (products) (the reaction will shift on the right) until it reaches equilibrium (Qc = Kc)
A jeweler heated a sample of silver from 22.0°C to 46.0°C. The specific heat of silver is
0.235 J/gºC. If the silver absorbed 26.0 J of heat, what is the mass of the silver?
please help me!
The mass of the silver : 4.6 g
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
∆T = temperature difference :
[tex]\tt 46-22=24^oC[/tex]
The specific heat of silver is 0.235 J/gºC
Q = heat = 26 J
The mass :
[tex]\tt mass(m)=\dfrac{Q}{c.\Delta T}\\\\m=\dfrac{26}{0.235\times 24}\\\\m=4.6~g[/tex]
How many valence electrons does Florine have?
O 5
O 7
3
9
Answer:
When forming ions, elements typically gain or lose the minimum number of electrons necessary to achieve a full octet. For example, fluorine has seven valence electrons, so it is most likely to gain one electron to form an ion with a 1- charge
Explanation:
Answer:
7
Explanation:
a-P-e-X
What elements does lithium resemble when it loses 1 electron?
Answer:
helium
Explanation:
By losing an electron, they look like the noble gas that immediately precedes them on the periodic table.
Help with this question
Answer:
So the number of protons equals the number of electrons.
Explanation:
Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
Which set of statements best explains the relationship between the parts of the respiratory system?
Answer:
The description of that same scenario is listed mostly in the explanation portion following.
Explanation:
This same respiratory system involves several lungs, as well as the systemic circulation concerning this same human heart, which operates in conjunction to pick up more oxygen as well as expel CO2 from the body.
These same lungs encourage O2 to pass both through alveoli via the blood capillaries surrounding off the front of the alveoli, that are otherwise interconnected to the arterial circulation, which carries O2 rich blood something to human heart through which O2 rich blood was indeed transported to many other blood vessels via the arteryConsequently, those system works together to promote the transmission of gas throughout tissues and organs and also to ensure sustainable the tissue functions required during metabolic functions.I do not know the answer. Please help
What pieces of evidence do scientists use to support the current theory of rapid expansion?
I am sorry I don't know, points are points though
This drawing shows a human body system.
What is the primary function of this body system?
A. The transport of nutrients, water, and oxygen to body cells.
B. The chemical breakdown of food into smaller pieces.
C. The protection of vital organs from injury.
D. The production of hormones that regulate growth and metabolism.
Answer:its A ( the transport of nutrients,water,oxygen to body cells
Explanation:
I just did it :)
Answer:
A. The transport of nutrients, water, and oxygen to body cells.
Explanation:
The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by the reaction?
Use q equals m C subscript p Delta T..
140 J
418 J
1,470 J
5,170 J
Answer:
The correct answer is 5,170 J
Explanation:
The heat absorbed by the reaction (Qr) is equal to the heat released by the calorimeter (Qcal):
Qr = - Qcal
We calculate Qcal from the mass of the calorimeter (m), the specific heat (Cp), and the change in temperature (ΔT), as follows::
Qcal = m x Cp x ΔT
We have the following data:
m = 1.400 kg x 1000 g/1 kg = 1,400 g
Cp = 3.52 J/g°C
Initial T = 28.50°C + 273 = 301.50 K
Final T = 27.45°C + 273 = 300.45 K
ΔT = Final T - Initial T = 300.45 K - 301.50 K = -1.05 K
So, we introduce the data in the mathematical expression for Qcal:
Qcal = m x Cp x ΔT = 1,400 g x 3.52 J/g°C x (-1.05 K) = -5,174.4 J ≅ -5,170 J
Therefore, the heat absorbed by the reaction is:
Qr = - Qcal = -(-5,170 J) = 5,170 J
Answer:
D
Explanation:
Just took the test.
How much energy is required to melt 2 kg of copper? Use the table below and
this equation: Q = mLfusion:
414 kJ energy is required to melt 2 kg of copper. Hence, option B is correct.
What is energy?Energy is the capacity for doing work.
Given parameters:
Mass of copper = 2kg
Unknown:
Amount of energy required to melt the copper =?
Solution:
To solve this problem, we use:
Q = m L
m is the mass
L is the latent heat of fusion of copper = 207kJ/kg
So;
Q = 2 x 207 = 414kJ
Hence, option B is correct.
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What is the electron structure of sodium?
Answer:
2,8,1
Explanation: This is the number of electrons sodium has on each electron shell
PLEASE HELP!!!! 60 points
Answer:
Have a nice Day , I would appreciate it if you could mark my answer brainliest
if 1 teacher cant teach all subjects how come 1 student can learn all subjects ?
Answer:
d
d.d.d.d.d.d..d.d.d.d.d.d.d.d..d.d.d.d.d.d.d
Explanation:
calculate the mass in gram of binormal solution in NAOH
Answer:
80 grams
Explanation:
Normality is one of the units of concentration and it is derived by dividing the gram or mole equivalent of the solute in a solution by the volume (in liters) of the solution.
The equivalent weight of NaOH is derived by dividing the molecular weight of the compound by 1. Hence, the equivalent weight of NaOH in 1 normal solution is 40/1 = 40 g.
If 1 normal NaOH solution contains 40 g of NaOH in 1 liter of the solution, then a binormal (2 normal) solution of NaOH would contain;
2 x 40 = 80 g of NaOH.
Please help me:(
Mr. Jacob is teaching his class about the various changes of Earth’s Surface over time. He wants his students to explain the evidence that supports the claim that fossils can show proof of the changing of Earth’s surface. Which of the following statements best explains how students can use fossils as evidence?
Question 4 options:
Plant fossils can be used as evidence of Earth’s surface changing because similar fossils found in various locations supports that Earth was once a supercontinent.
Plant fossils can be used as evidence of Earth’s surface changing because different fossils found in one specific location on earth supports that earth was once a supercontinent.
Animal fossils can be used as evidence of Earth’s surface changing because different fossils found in various locations supports that Earth was once a supercontinent.
Animal fossils can be used as evidence of Earth’s surface changing because similar fossils found in one specific location of earth supports that Earth was once a supercontinent.
Answer:
A
Explanation:
Organism that consist of many cells?
Answer:
Multicellular Organisms.
Explanation:
Hi
Question 2
How does an object become negatively charged
Answer:
It gains electrons.
Explanation:
Got it right on a quiz.
When electrons are added to or taken away from an object, an electrical charge is produced. An object acquires a negative charge when electrons are introduced to it because electrons have a negative charge. An object acquires a positive charge when its electrons are removed.
When a thing picks up electrons, it becomes negatively charged. Non-metals gain electrons at the atomic level to fill their outer electron orbitals. An atom that is negatively charged and has more electrons than protons is said to be an anion.
Some atoms have the ability to draw in more electrons, making them negatively charged. Ions are defined as atoms that are not electrically neutral.
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find the mass of electron
Answer: mass of electron is
9.10938356 × 10^-31 kilograms
Explanation:
What is another name for the galvanic cell?
O A. The voltaic cell
O B. The salt bridge
O C. The potential cell
O D. The redox cell
Answer:
The Voltaic Cell
Explanation:
Answer: A
Explanation: i just took the test :)
i will give brainliest
Which statement best describes the direction of force shown by the magnetic
field lines around a bar magnet?
A. Away from both the magnet's north and south poles
B. Toward both the magnet's north and south poles
C. From the magnet's north pole to its south pole
D. From the magnet's south pole to its north pole
Answer:
I believe the amswer is a hope this helps
Answer:
c
Explanation:
hope you can redo it to get it right
Pedro is heating sugar to make caramel for an investigation. As the sugar is heating, he is looking for evidence of a chemical change. Select the observation that Pedro made about the chemical change.
Answer:
The sugar atoms formed new atoms after caramelization.
Explanation:
When sugar is heated to a certain temperature, it becomes caramel. Te formation of caramel from the sugar is a chemical process.
In the context, Pedro is doing an investigation by heating sugar to make caramel. Burning of the sugar crystal is a chemical change as different chemicals are present in both. The caramel formed cannot be revered back to sugar crystal, this also proves the chemical change of caramelization of sugar cubes. Sugar consists of carbon, oxygen and hydrogen atoms. It reacts with atmospheric oxygen atoms to form new groups of atoms and forms caramel.
a)Calculate the mass of NaNO3 that heated strongly and produced 4.5 dm3(cubic decimeter) of O2 gas.
The chemical equation for a chemical reaction is given below (2)
2NaNO3 ---> 2NaNO2 +O2
b) Calculate the concentration of HCl solution formed by dissolving 200 g HCl in 300 CM3 of water.(2)
Answer:
a) 34 g
b) 18.33 moldm^-3
Explanation:
a) The equation of the reaction is;
2NaNO3----------> 2NaNO2 + O2
Let us recall that 1 mole of a gas occupies 22.4 dm^3. Since 1 mole of O2 is produced in the reaction, we can write;
2 moles of NaNO3 yields 22.4 dm^3 of O2
x moles of O2 yields 4.5 dm^3 of O2
x = 2 * 4.5/22.4
x = 0.4 moles of NaNO3
But number of moles = mass/molar mass
molar mass of NaNO3 = 85 g/mol
Mass of NaNO3 = 0.4 moles * 85 g/mol
Mass of NaNO3 = 34 g
b)
Number of moles in 200g of HCl = mass/molar mass
molar mass of HCl = 36.5 g/mol
Number of moles = 200g/36.5 = 5.5 moles
From;
Number of moles = concentration * volume in dm^3
concentration = Number of moles/ volume in dm^3
But volume = 300 cm^3 or 0.3 dm^3
concentration = 5.5/0.3 = 18.33 moldm^-3
4 gramos de cafe soluble, 20 gramos de azucar y agua hasta completar 200 ml, Calcula la concentración (%m/v) de todas las sustancias que forman el refresco
Answer:
2 % de cafe, 20% de azucar, 100% de agua.
Explanation:
Un clásico problema de soluciones:
- Nuestros solutos son 4 g de cafe y 20 g de azúcar.
- en 200 mL de agua
Podemos asumir que los 200mL es el volumen de solución.
%m/v es un tipo de concentración que señala los gramos de soluto en 100 mL de solución.
% m/v de cafe → (4/200) . 100 = 2 %
% m/v de azucar → (20/200) . 100 = 20 %
Si tomamos al agua como sustancia que forma parte de la solución sería
(200/200) . 100 = 100 %
Lo que podríamos leer 100 g de agua en 100 mL de agua, dado que la densidad del agua es 1 g/mL
Which of the following have metallic bonding? 1. Magnesium chloride 2. Hydrogen chloride. 3. Magnesium. 4. Chlorine
Explanation:
Magnesium chloride has Ionic bonding.
Hydrogen chloride has Covalent bonding.
Chlorine has Covalent bonding.
Only Magnesium has metallic bonding (3).
Can a larger, cooler object have more TOTAL kinetic energy than a smaller, warmer object?
Answer:Hotter objects have a higher average kinetic energy and a higher temperature ; cooler objects have a lower average kinetic energy and a lower temperature.
Explanation:
How do unbalanced forces cause a change in speed, direction, and position of an object?
Answer:
But its motion is not changing. This is because the forces acting on it from opposite sides are exactly the same size. An unbalanced force can change an object's motion. ... An unbalanced force acting on a moving object could make the object change direction, change speed, or stop moving.
The unbalanced forces are unequal in magnitude. They change the state of motion of the object. The pushing or pulling of an object can generate unbalanced forces and cause change in the direction, and position of an object.
What is an unbalanced force?The two forces of unequal magnitudes and they act on an object simultaneously such that the net force is not zero are defined as the unbalanced forces. The body acted upon by the unbalanced forces changes its state of motion.
The unbalanced forces are the opposite of a balanced force. An unbalanced force causes a change in motion, speed, direction, or movements. Because of unequal force or strength which is applied to one side of an object.
In the case of unbalanced forces, one side has more energy than the other. Opposite sides have forces acting against them.
Thus the unbalanced forces are out of balance and are not equal, it causes body's position to change.
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1. In a Stock system name such as iron(III) sulfate, the Roman numeral tells us (a) how many atoms of Fe are in one formula unit. (b) how many sulfate ions can be attached to the iron atom. (c) the charge on each Fe ion. (d) the total positive charge of the formula unit. 2. Changing a subscript in a correctly written chemical formula (a) changes the number of moles represented by the formula. (b) changes the charges on the other ions in the compound. (c) changes the formula so that it no longer represents the compound it previously represented. (d) has no effect on the formula.
Answer:
See explanation
Explanation:
1) The formula of the compound is Fe2(SO4)3. There are two ion atoms in any formula unit as we can see here. Three sulphate ions are attached to iron. Each iron ion carries a +3 charge as we saw in the formula. The total positive charge in each formula unit is +6.
Changing a subscript in a correctly written chemical formula changes the formula so that it no longer represents the compound it previously represented. Hence FeSO4 is a different compound from Fe2(SO4)3.
how many protons neutrons and electrons does Francium have?
