Answer.1 B
Explanation:
Student's proposed procedure includes repetitions because in his procedure he had mentioned that he had repeated the same experiment by making his sister wear different diapers from another four brands after each hour. And also repeated the same whole experiment for a week.
Answer.2 D
Explanation:
Procedure is not replicable as there were many independent and dependent factors which cannot be replicated.
Answer:
B
Explanation:
Select the atomic models that belong to the same element.
Left Panel
The trick is to look at the protons, all other things being equal. The yellow spheres are neutrons we are led to believe. All the diagrams show the same number of electrons(2), so there is no help there.
The upper left
The upper right
The Lower left
All have 2 protons and 2 electrons. <<<< Answer Read the 3 lines above.
The center one has only 1 proton And the lower right has 3. Both of them are wrong.
Right Panel
You have answered this one correctly
Calculate the number of moles of bromine present in 20.5 mL of Br2(l), whose density is 3.12 g/mL.
There are 0.400 mol Br₂ in the sample..
Mass of Br₂ = 20.5 mL Br₂ × 3.12 g Br₂/1 mL Br₂ = 63.96 g Br₂.
Moles of Br₂ = 63.96 g Br₂ × (1 mol Br₂/159.81 mol Br₂) = 0.400 mol Br₂
The 20.5 ml of bromine sample has been consisted of 0.4 mol.
Density can be defined as the mass of an element per unit volume. The density (D) can be expressed as:
[tex]D=\dfrac{M}{V}[/tex]
Where, m has been the mass of the compound
V has been the volume of the compound.
The given Bromine has:
[tex]D=3.12\;\text {g/ml}\\V=20.5\;\rm ml[/tex]
The mass of bromine has been calculated by substituting the values as:
[tex]3.12=\dfrac{m}{20.5}\\\\m=3.12\;\times\;20.5\;\text g\\\\m=63.96\;\text g[/tex]
The mass of bromine sample has been 63.96 g. The moles of the sample has been calculated as:
[tex]M=\dfrac{m}{mwt}[/tex]
Where, mass of the substance, [tex]m=63.96\;\text g[/tex]
Molecular weight of the substance, [tex]mwt=159.81\;\text{g/mol}[/tex]
Substituting the values for calculating moles (M) as:
[tex]M=\dfrac{63.96}{159.81}\;\text{mol}\\\\M= 0.4\;\text{mol}[/tex]
The number of moles of [tex]\rm Br_2[/tex] present in 20.5 ml has been 0.4 mol.
For more information about density, refer to the link:
https://brainly.com/question/952755
when a flower is ready to become a fruit here would the instruction be found A.Plant ovum B.Nucleus C.Mitochondria D.Ribosomes
Answer:
Answer is A. Nucleus.
Flower is the reproductive organ of a flowering plant that contains male reproductive organ ( stamen) and female reproductive organ (carpel). Anther of the stamen produces male gamete and within the ovary of the carpel produced female gamete. After fertilization male gamete and female gamete fuses to form zygote. Zygote is a single cell whose nucleus has chromosomes, where all the genetic information regarding development of fruit and seed are stored.
Explanation:
In a longitudinal wave, the _________ is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. WILL MARK BRAINLIEST
The wavelength in a longitudinal wave is the distance between consecutive compressions or rarefactions. Compressions are analogs to peaks, and rarefactions to troughs of transverse waves, while amplitude refers to the particle displacement from equilibrium.
In a longitudinal wave, the wavelength is the distance from one compression to the next compression or from one rarefaction to the next rarefaction.
Most longitudinal waves consist of areas of higher pressure, known as compressions, where the particles in the medium are closest together, and areas of lower pressure, called rarefactions, where the particles are furthest apart. Therefore, the wavelength of a longitudinal wave can be defined as the distance between two consecutive compressions or two consecutive rarefactions.
The compression in a longitudinal wave is analogous to the peak of a transverse wave, while the rarefaction is analogous to the trough. The amplitude in longitudinal waves represents the extent of displacement of the medium's particles from their equilibrium position, occurring at both compressions and rarefactions.
The reaction between zinc and hydrogen chloride produces zinc chloride, hydrogen gas, and heat. If more heat is removed from the reaction, how does the rate of reaction change to counter the action?
When more heat is removed from the reaction, the rate of reaction slows down to counteract the heat loss. This can be controlled by changing the temperature or using a catalyst.
Explanation:When more heat is removed from the reaction between zinc and hydrogen chloride, the rate of the reaction slows down to counteract the heat loss. This is because the reaction is exothermic, meaning it releases heat as a product. By slowing down the reaction rate, less heat is produced, helping to maintain equilibrium in the system.
One way the rate of reaction can be controlled is by changing the temperature of the system. When heat is removed, the temperature decreases, which decreases the kinetic energy of the reactant molecules. As a result, the frequency of successful collisions between reactant molecules decreases, slowing down the overall rate of the reaction.
Another way the rate of reaction can be controlled is by using a catalyst. A catalyst is a substance that speeds up the rate of a reaction without being consumed in the process. By providing an alternative pathway for the reaction to occur, a catalyst can help overcome the activation energy barrier, allowing the reaction to proceed at a faster rate.
whats the answer and how you got it please :-)
What is the density of a 22.91 irregularly shaped object if the initial volume of water was 22.3 and the volume rose to 66.8mL after the object was added?
The density is 0.515 g/cm³.
Mass = 22.91 g
Volume = 66.8 mL – 22.3 mL = 44.5 mL = 44.5 cm³
Density = mass/volume = 22.91 g/44.5 cm³ = 0.515 g/cm³
what is a golf ball and a bowling ball are moving the ball and both have the same kinetic energy which one is moving faster
If they are moving on a plane, the bowling ball would be moving faster if applied the same amount of force as the golf ball.
This is because the bowling ball has a greater mass, and therefore greater kinetic energy.
The greater the kinetic energy, the faster the object will move.
Hope this helps and have a nice day! :)
What happened during the Renaissance that encouraged progress in the study of matter?
During the dark ages-All that wasn't around the christian religion were lost. Knowledge and discoveries before the Dark Ages were mainly in Greek ideas. Biblic scripts however were in Latin. Therefore all inventions up to the dark ages were lost and only religious scripts preserved in the churches. Outside the church, no one knew how to write, read or even communicate.
The Renaissance period has been encouraged the progress in study with the emergence of Italian masters, and new world.
Renaissance has been a French word that means rebirth. The period has been started in the early 13th century and has been lasted up to 16th century.
Progress during Renaissance periodThe period has been started in France. It has been the reconstructive period for the literature and art.
The period has been marked with the emergence of Italian masters such as Leonardo da Vinci, Raphael and Michelangelo. There has been the discovery of the new world with the work of Columbus.
Thus, the Renaissance period has been encouraged the progress in study with the emergence of Italian masters, and new world.
Learn more about Renaissance period, here:
https://brainly.com/question/14474139
Give me your best explanation on graphene carbon metal
Will give brainliest
Graphene is a semimetal with small overlap between the valence and the conduction bands. It is an allotrope of carbon consisting of a single layer of carbon atoms arranged in a hexagonal lattice (figure 1).It is the basic structural element of many other allotropes of carbon, such as graphite, diamond, charcoal, carbon nanotubes and fullerenes.
Graphene Carbon along metal:
Metal oxides such as TiO2 and ZnO are large-band-gap semiconductors, and they are photocatalytically active under UV irradiation. These oxides are capable of interacting with graphene oxide via carboxylic acid functional groups. Thus, mixing of two suspensions of GO and TiO2 or ZnO results in the binding of oxide particles to graphene oxide flakes. These particles remain suspended in suspension, minimizing any aggregation effects.
Graphene Oxide-Metal Nanoparticle Composites
Reduced graphene oxide serves as a support material to stabilize metal nanoparticles. For example, the synthesis of silver and gold nanoparticles stabilized by graphene oxide sheets has been reported by several research groups.These composites have also been assembled as ultrathin films using a layer-by-layer self-assembly technique.30 The procedure to make these composites consists of mixing of GO and a metal salt solution (AgNO3, HAuCl4, or H2PtCl6) and adding a dilute borohydride solution. The chemical reduction process reduces both GO and metal ions. The RGO acts as a support to stabilize metal nanoparticles.
Applications:The resulting G-carbon composite exhibited competitive catalytic activity and superior methanol tolerance compared to a commercial Pt/C catalyst. Furthermore, it demonstrated significantly higher catalytic efficiency than a Pt/C catalyst.
Which group of elements shares characteristics with both metals and nonmetals?
metalloids
salts
halogens
alloys
The answer to your question is,
Metalloids. They are a mix of elements that are both metals and non-metals in one.
-Mabel <3
which of the follow are pure substances
the answer is v
hope it helps!
Pure substances in Chemistry are either elements or compounds. Elements are the simplest form of pure substances, examples include gold or oxygen. Compounds are made up of two or more different types of elements in a fixed ratio, such as water or carbon dioxide.
Explanation:In Chemistry, pure substances are substances that are made up of only one type of particle and have a fixed or constant structure. They are classified into elements and compounds. Elements are the simplest form of pure substances and cannot be broken down any further.
Examples include gold, copper, oxygen and carbon. Compounds are pure substances that are made up of two or more different types of elements that are chemically combined in a fixed ratio. Examples include water (H2O), carbon dioxide (CO2), and sodium chloride (NaCl).
Learn more about pure substances here:https://brainly.com/question/33442681
#SPJ2
Which statements describe molecules? Check all that apply.
Molecules are made of two or more atoms. A
Molecules are all the same size B
Molecules range in size. C
Molecules are only made of atoms of the same element. D
Molecules are only made of atoms of different elements. E
Molecules are made of atoms of the same element or different elements.F
The following answers are A, C, and F
Molecules are composed of two or more atoms and can vary greatly in size. They can be made of either the same or different elements. Examples include O₂ for the same element and H₂O for different elements.
Let's review each statement to determine whether it accurately describes molecules:
Molecules are made of two or more atoms. (Correct) - Molecules are composed of two or more atoms bonded together chemically. For example, an oxygen molecule (O₂) consists of two oxygen atoms.Molecules are all the same size. (Incorrect) - Molecules vary in size depending on the number of bonded atoms and their arrangement. Smaller molecules, like O₂, have only a few atoms, whereas larger molecules, like DNA, can have millions of atoms.Molecules range in size. (Correct) - As mentioned, molecules can range from very small, like hydrogen molecules (H₂), to very large, like DNA.Molecules are only made of atoms of the same element. (Incorrect) - Molecules can consist of atoms of the same element or different elements. For instance, a water molecule (H₂O) consists of two hydrogen atoms and one oxygen atom.Molecules are only made of atoms of different elements. (Incorrect) - While some molecules, like CO₂, have different elements, others, like O₂, are made of the same element.Molecules are made of atoms of the same element or different elements. (Correct) - Molecules can be formed from either the same element, like O₂, or different elements, like H₂O.how do new scientific discoveries affect our everyday life
It affects our everday life because of new inventions and easier ways to make/produce different stuff!
why was the mass lost when the reaction was done in the normal setup but stayed the same when it was done in the gas collection setup
The law of conservation of mass states that in any reaction mass is neither created nor lost it has to remain constant in a system.
In this case, when the reaction setup was done in normal way the mass was lost in surrounding was not considered nor being calculated; whereas when the reaction was studied in a closed system where the gas was collected after the reaction the mass changes was noted down which helped to prove the point of law of conservation of mass and energy.
One can consider an example of soda can where the carbonated drink contains pressurized carbon dioxide gas. when opened the gas bubbles gets lost into the surroundings and we don't measure the mass changes. Instead if the soda can was opened in such a way where the gas evolved was measured then the mass changed would remain the same.
The discrepancy in mass during a normal setup versus a gas collection setup in a chemical reaction is due to the escape of gaseous products in the former, while the latter contains gases ensuring mass is conserved in accordance with the law of conservation of mass.
Explanation:The phenomenon you are describing is related to the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. When you observed a loss of mass in the normal setup, it's likely due to the escape of gas which was not contained. However, in the gas collection setup, no mass is lost because the gases produced are collected and their mass is taken into account, ensuring that the total mass remains the same, which adheres to the conservation of mass.
During chemical reactions, the total mass should always remain constant, as mass is conserved. If there is a difference in mass, as in the loss of -0.1834 g, it usually indicates that a gaseous product has escaped into the atmosphere and was not measured. In contrast, reactions like nuclear fusion and fission create such a vast amount of energy that there may be a measurable decrease in mass since some matter is converted into energy following Einstein's equation, E = mc², though this is not typically observable in chemical reactions.
Learn more about conservation of mass here:https://brainly.com/question/13383562
#SPJ3
Correct forms of the equation of Charles’s law is (are)
According to Charles' Law the volume of an ideal gas is directly proportional to its absolute temperature in Kelvin keeping the pressure constant.
V∝ T, P is constant
where V, T and P are volume, temperature and pressure
[tex]\frac{V1}{T1 }[/tex] = [tex]\frac{V2}{T2}[/tex]
where V₁, T₁, V₂ and T₂ are initial volume, initial temperature, final volume and final temperature.
how are physical properties used to describe matter?
If a yes or no question, Yes
Physical properties are used to observe and describe matter. Physical properties can be observed or measured without changing the composition of matter. These are properties such as mass, weight, volume, and density.
Identify the positively-charged sub-atomic particle in the nucleus. A) electron B) neuron C) neutron D) proton
The PROTON (option D) is the positively charged sub-atomic particle in the nucleus.
Answer:
D) proton
Explanation:
The electron is not found in the nucleus. Neurons are not sub-atomic particles. The nucleus is made up of the two particles. The neutral, or no-charge, neutron and the positively charged proton.
please help question is attached
20 POINTS!
ANSWER THESE 5 QUESTIONS!
why do the gas gaints have many moons
The planet forms, it is massive enough that it collects other objects that come near it and that's why they CAN have so many moons.
Gas giants dont have to stay so far from their sun. ... In our solar system, the outer planets vacuumed up all the available materials from Jupiter on out.
How many atoms are in 1.45 mol of pure aluminum
There are approximately 8.7319 × 10²³ aluminum atoms in 1.45 mol of pure aluminum, calculated by multiplying the moles of aluminum by Avogadro's number.
To determine the number of atoms in 1.45 mol of pure aluminum (Al), we use Avogadro's number, which states that one mole of any substance contains 6.022 × 10²³ atoms.
The calculation is as follows:
Identify the amount in moles: 1.45 mol of Al.
Multiply the amount in moles by Avogadro's number: 1.45 mol × 6.022 × 10²³ atoms/mol.
Perform the multiplication to find the total number of atoms: 1.45 × 6.022 × 10²³ = 8.7319 × 10²³ atoms of Al.
The SI defining constant Avogadro constant, often known as NA or L, has a precise value of 6.02214076×10²³ mol⁻¹. It serves as a normalisation factor for the amount of substance in a sample and is defined as the number of constituent particles per mole.
Therefore, there are approximately 8.7319 × 10²³ aluminum atoms in 1.45 mol of pure Al.
Which layer of the sun is only seen during the height of a total solar eclipse? A. Photosphere B. Corona C. Convection zone D. core
Question:Which layer of the sun is only seen during the height of a total solar eclipse?
Answer: Corona
Explanation:During a total solar eclipse parts of the Sun that we normally can't see become visible but during it we can see the corona
question answered by
(jacemorris04)
The layer of the Sun which is only seen during the height of a total solar eclipse is: B. Corona.
An eclipse refer to an astronomical event that usually takes place when a celestial body in space gets in between the Sun and another celestial body, leading to the total or partial obscuration (blocking) of light to the celestial body.
In Science, there are two (2) main types of eclipse and these are;
Lunar eclipse: this is an astronomical event that takes place when planet Earth comes in between the Moon and the Sun thereby causing it to cover the Moon with its shadow.Solar eclipse: this is an astronomical event that takes place when the Sun is obscured (blocked) by the Moon and engulfing a portion of the Earth.Total solar eclipse involves the total obscuration (blocking) of the Sun is obscured (blocked) by the Moon causing a complete engulfment of the Earth.
During the height of a total solar eclipse, Corona is the layer of the Sun that is only seen while the core, Photosphere, and Convection zone are not seen.
Read more: https://brainly.com/question/21828533
Texture provides clues about how igneous rocks were formed A. true B. False
Copper has an atomic number of 29.
That means that there are 29 protons in the nucleus of each copper atom. That's what the atomic number is; the number of protons in an atom of a certain element.
If one copper atom contains 29 protons, how many ELECTRONS are there in in 3 atoms of copper?
Yeah basically, you just have to multiply the protons (29) and the number of atoms of copper (3) together. So, 29 times 3 is equal to 87.
Hydrogen (atomic number 1) has three isotopes: ¹H, ²H, and ³H. What is the number of protons in an atom of hydrogen with the highest mass number?
(a) 2
(b) 1
(c) 0
(d) 3
Hydrogen, regardless of its isotopes, always has 1 proton. This is due to its atomic number being 1. Therefore, even the isotope of hydrogen with the highest mass number (³H) still has only 1 proton.
Explanation:The atom of hydrogen with the highest mass number is ³H. The number before 'H' represents the mass number, which is the total number of protons and neutrons in the nucleus. However, regardless of its isotopes, hydrogen's atomic number is 1, indicating that it always has 1 proton. So, in response to your question, the hydrogen atom with the highest mass number still has just 1 proton.
Learn more about Hydrogen Isotopes here:https://brainly.com/question/36946467
#SPJ2
Calculate the frequency of a wave with a wavelength of 8.00x10 m. In what region of the electromagneti spectrum is this?
The frequency of the wave with a wavelength of is 3.748 × 10 ⁶ /s.
I attached the working and the answer to the question below. I hope I was able to help.
Please note that C = speed of light (2.998 × 10⁸ m/s), ν = frequency and λ= wavelength.
Is gold an element , compound , or a mixture ?
Correct answer=
gold is an element, it has a symbol of An
Hope it helped
Gold is an element, not a compound or a mixture. It is represented on the periodic table by the symbol Au and cannot be broken down into a simpler substance.
Explanation:Gold is an element, not a compound or a mixture. It's one of the 118 known chemical elements, and it's represented on the periodic table by the symbol Au (from the Latin 'aurum'). As an element, gold consists of only one type of atom and cannot be broken down into a simpler substance. It differs from a compound, which is formed from two or more elements bonded together, and a mixture, where you can physically separate the individual components that make it up.
Learn more about Gold as an element here:https://brainly.com/question/34709156
#SPJ6
As the speed increases how does the potential kinetic and total energy levels change
As speed increases, the potential energy in the object decreases, while the kinetic energy increases. Both of those are forms of mechanical energy. Hope this helps!
Give the masses of the three most abundant Cl2O molecules
Chlorine has the following % abundance and mass:
Cl-35 = 75.76 %, 34.9688 amu
Cl-37 = 24.24 %, 36.9659 amu
Oxygen has the following % abundance and mass:
O-16 = 99.757 %, 15.9949 amu
O-17 = 0.038 %, 16.9991 amu
O-18 = 0.205 %, 17.9991 amu
Based in the % abundance O-16 is the most abundant oxygen isotope and Cl-35 is the most abundant chlorine isotope
So the most abundant molecule of Cl2O and their respective mass are as follows:
1) Cl-35, Cl-35, O-16
Mass = 34.9688 amu + 34.9688 amu + 15.9949 amu = 85.9325 amu
2) Cl-35, Cl-37, O-16
Mass = 34.9688 amu + 36.9659 amu + 15.9949 amu = 87.9296 amu
3) Cl-37, Cl-37, O-16
Mass = 36.9659 amu + 36.9659 amu + 15.9949 amu = 89.9267 amu
Mass is the quantity of matter present in a substance. The masses of the most abundant molecule of [tex]\rm Cl_{2}O[/tex] are 85.9325, 87.9296, and 89.9267 amu.
What are isotopes?Isotopes are the elements of the same species with the same atomic number but differ in atomic mass and physical properties.
% abundance and mass of chlorine are:
Cl-35 = 34.9688 amu
Cl-37 = 36.9659 amu
% abundance and mass of oxygen are:
O-16 = 15.9949 amu
O-17 = 16.9991 amu
O-18 = 17.9991 amu
O -16 is the most abundant form of the oxygen isotope and Cl -35 of chlorine.
The masses of the most abundant molecule are given as:
Cl-35, Cl-35, O-16:
[tex]34.9688 \;\rm amu + 34.9688 \;\rm amu + 15.9949 \rm \;amu = 85.9325\;\rm amu[/tex]
Cl-35, Cl-37, O-16:
[tex]34.9688 \;\rm amu + 36.9659 \;\rm amu + 15.9949 \;\rm amu = 87.9296 \;\rm amu[/tex]
Cl-37, Cl-37, O-16:
[tex]36.9659 \;\rm amu + 36.9659 \;\rm amu + 15.9949 \;\rm amu = 89.9267 \;\rm amu[/tex]
Therefore, 85.9325, 87.9296, and 89.9267 amu are the masses of the most abundant form of the molecule.
Learn more about mass here:
https://brainly.com/question/5137820