Answer:
The prediction of the student about the amount of reactant and product is incorrect.
No, I do not agree with the student’s prediction because the amount of reactant is always equals to the amount of product. According to the Law of Conservation of Mass, mass cannot be created nor destroyed. Therefore in any chemical reaction the mass of the products must equal or same to the mass of the reactants so according to this law, the prediction of the student is incorrect.
Explanation:Give brailiest please
Answer:
The chemical reaction that occurs when vinegar and baking soda (sodium bicarbonate) are combined, creates a gas that is known as carbon dioxide (or CO2). I would agree with the student's prediction because the atoms rearrange themselves to create the product.
Explanation:
Hope this helps! Pls give brainliest!
A cup of coffee cools to 15 °C from 30 ° C. What is the change in temperature?
Answer:
15° C
Explanation:
30-15=15
checking* 15+15=30 or 15x2=30
3.7x10^45 molecules of hydrogen gas = how many grams of hydrogen gas
Since we weren't given the moles of hydrogen, we have to find it. However, we can do it all in one step if we set up the equation correctly.
Since Mass = moles × molar mass
& Moles = #molecules ÷ Avogadro's Number
∴ mass = (#molecules ÷ Avogadro's Number) × molar mass
= (3.7 × 10⁴⁵ mcules ÷ (6.022 × 10²³ mcules/mole)) × 1.008 g/mol)
= 6.19 × 10²¹ g
the symbol for the element in period 2 group 13 is
Answer:
Boron
Explanation:
Using the periodic table we can see that Period 2 represents the second row. Group 13 indicates the 13th column.
please answer this question correctly
What are epimers?
How are glucose and manose epimers?
Please Help!
Answer:
Epimers are carbohydrates which vary in one position for the placement of the -OH groupExplanation:
they have a specific type of stereoisomers which have multiple stereo center's but differ from one another, they differ from each other by configuring at the c-2" atom . so, they are epimersCompare and contrast Dalton's atomic theory with modern atomic theory.
Answer:
Postulates of Dalton's Atomic Theory:
1) Atoms can neither be created nor destroyed.
2) During chemical reaction, atoms combine or separate or re-arrange. They combine in simple ratios.
3) All elements are composed of the indivisible particles called atoms.
4) Atoms of a particular element are identical. They have the same mass and volume.
Postulates of modern atomic theory:
1) All matter is composed of atoms.
2) Atoms consist of protons, electrons and neutrons.
3) Atoms of an element may differ in masses. (as in isotopes)
4) The ratio in which elements combine may not be simple.
Similarities:
1) All elements/matter are/is composed of atoms.
2) Atoms can neither be created nor destroyed.
3) During chemical reactions, atom combine or separate or rearrange.
Differences:
1) Dalton's theory said that atoms are indivisible particles but modern theory denies it and calls atom a divisible particle consisting of sub-atomic particles, protons, electrons and neutrons.
2) Dalton's theory said that atoms of the same element have same mass and volume but according to modern theory, it is said that atoms of the same element can differ in mass (as in isotopes).
3) Dalton said that atoms combine in simple ratio but modern theory denies it.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807rutherford called the region that deflected alpha particles
Answer:
Rutherford concluded that these particles were striking... a tiny region of positive charge. Rutherford called the region that deflected alpha particles... a nucleus. The total volume of the nucleus of an atom is... very small compared with the rest of the atom. Except for in the simplist type fo hydrogen atom, all nuclei consist of...
Explanation:
isotopess! help pleasee 20pts
Answer:
For lithium -6
Proton neutron and electron are
3, 3, 3
For lithium -7
It is 3, 4, 3
Explanation:
Proton is atomic number
Neutron is mass num - atomic num
Electron is the same number with proton
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?
We have that the time that will have elapsed when 25.00 grams remains is
T=72hours
From the question we are told
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?
Generally the equation for the Half life is mathematically given as
Where
[tex]X=\frac{25}{100}\\\\X=0.25\\\\Therefore\\\\\frac{1}{2}^n=0.25\\\\n=2 half lives[/tex]
Therefore
T=2*36
T=72 hours
Hence
the time that will have elapsed when 25.00 grams remains is
T=72hours
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the ribosome catalyzes the formation of which bond?
Answer:
the ribosome catalyzes the formation of which bond peptide bonds, peptidyl transfer, the formation of a peptide bond during protein synthesis
at 20°c, a 0.376 m aqueous solution of ammonium chloride has a density of 1.0045 g/ml. what is the mass % of ammonium chloride in the solution? the formula weight of nh4cl is 53.50 g/ml.
At 20°c, a 0.376 m aqueous solution of ammonium chloride has a density of 1.0045 g/ml. The mass percent of the ammonium chloride in the solution is 2.003%.
The number of moles of a substance can be estimated as:
[tex]\mathbf{number\ of\ moles = \dfrac{mass}{molar \ mass}}[/tex]
Given that:
number of moles = 0.376 Mmolar mass of ammonium chloride = 53.50 g/mlMass = number of moles × molar mass
Mass = 0.376 × 53.50
Mass = 20.116 grams
In one mL of ammonium chloride; the grams of ammonium chloride is:
[tex]\mathbf{= \dfrac{20.116 \ grams}{1000 \ mL}}[/tex]
= 0.020116 g/mL
The mass of ammonium chloride in the solution can be computed as:
[tex]\mathbf{=(\dfrac{mass \ of \ NH_4Cl}{density \ of \ the \ solution})\times 100}[/tex]
[tex]\mathbf{=(\dfrac{0.020116 }{1.0045})\times 100}[/tex]
= 2.003%
Therefore, we can conclude that the mass percent of the ammonium chloride in the solution is 2.003%.
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If yuo put hand sanitizer in a bottle, light a match, drop it in the bottle, what will happen?
Answer: As hand sanitizer dries, it evaporates into gas, which can also catch fire. That’s why the experts recommend that people avoid lighters, matches and fires after using hand sanitizer.
Explanation:
Explanation:
A medida que se seca el desinfectante de manos, se evapora en gas, que también puede incendiarse. Es por eso que los expertos recomiendan que las personas eviten los encendedores, fósforos y fuegos después de usar desinfectante para manos.
MAKE A POSTER OR SLIDES OF THE FOLLOWING INFORMATION
Important Details:
Due Date: October 8, 2021
Maximum group size: 2
Information to Include:
Origin –
ð Date of discovery
ð Discoverer
Background – Use these aspects of your element to describe your superhero (if you can’t think of how to show one of these, you could always use it as decoration on their costume):
ð: Name of the element
ð Element symbol
ð Atomic number
ð Atomic mass
ð Number of protons
ð Number of electrons (in a neutral atom)
ð Number of neutrons
ð Drawn picture of atom (YOU MUST DRAW IT)
ð Boiling point
ð Melting point
ð State of matter (at room temperature)
ð Uses for element
ð Type of element (metal, nonmetal, metalloid)
ð Group name (halides, lanthanides, noble gases, etc.)
ð Other elements in group
MUST BE COLORFUL AND DETAILED
Project Format (choose ONE):
Poster
Slides
flyer
Pamphlet
Criteria
4-5
3-3.99
2-2.99
0-1.99
Origin
All of the components for the origin criteria are present, explained fully, and are related to the context in an appropriate manner.
One component is missing; or, some components are not clearly explained.
Two components are missing; or, several components are not clearly explained.
More than two components are missing, or all components are not clearly explained.
Background
All of the components for the background criteria are present, explained fully, and are related to the context in an appropriate manner.
One component is missing; or, some components are not clearly explained.
Two components are missing; or, several components are not clearly explained.
More than two components are missing, or all components are not clearly explained.
Powers
All of the components for the criteria of the power are present, explained fully, and are related to the context in an appropriate manner.
One component is missing; or, some components are not clearly explained.
Two components are missing; or, several components are not clearly explained.
More than two components are missing, or all components are not clearly explained.
Other Heroes/Villains
All of the components for the other heroes/villains criteria are present, explained fully, and are related to the context in an appropriate manner.
One component is missing; or, some components are not clearly explained.
Two components are missing; or, several components are not clearly explained.
More than two components are missing, or all components are not clearly explained.
Work Quality
The work is of high quality, clean, neat, and easy to follow.
One component is missing; or, some components are not clearly explained.
Two components are missing; or, several components are not clearly explained.
More than two components are missing, or all components are not clearly explained.
Individual Contribution
The individual participated equally with their partner in the project with little to no drama and minimal prompting.
The individual participated in the project but was slightly less than an equal partner. May have required prompting to participate.
The individual participated, but was less than an equal partner, or required multiple prompts to participate.
Little to no participation in the project, requiring many prompts.
Score:
/30
Answer:
This is something you have to do yourself. The teacher is even letting you have a partner. Nobody is going to do this project for you because it´s your responsibility to finish it on your own.
Explanation:
Which statement best describes the charges of the particles involved?
(1 point)
O A neutral particle is striking a positive particle, breaking it into more
O A negative particle is striking a positive particle, breaking it into mor
O A positive particle is striking a neutral particle, breaking it into more
O A neutral particle is striking a negative particle, breaking it into more
The statement that best describes the charges of the particles is : ( A ) A neutral particle is striking a positive particle, breaking it into more
Production of Negative and Positive particlesThe collision of Neutral and postitve particles leads to the production of more negative and positive particles. Due to the neutral force and this leads to the production of an electrical charges.
Hence a neutral particle striking a positive particle will lead to the production of more positive particle.
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How many kilojoules are equivalent to 10 Joules?
A) 0.001 kJ
B) 0.01 kJ
C) 1000 kJ
D) 10,000 kJ
Answer:
It should be B: 0.01 kJ
Answer:
Hey...The answer is B) 0.01 kJ
What is the difference between a molecule and compound?
A compound is a special type of molecule where the atoms that form the molecule are of different elements.
hydrogen is grouped with the alkali metals because it
Answer:
Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.
Explanation:
List 5 physical properties of matter. How many atoms of each type of element in C6H12O6?
what is a acid and how does it react with metals (chemical reaction)?
Explanation:
Acids are substances whose ph is lower than 7.Acids react with most metals to form a salt and hydrogen gas.
A school bus travels 270 km in 6 hr. What is its average speed for the trip in km/hr?
Answer:
45km/hr
Explanation:
270/6=45
Which characteristics of sedimentary rocks allow them to preserve fossils?
O A. high heat, high pressure
O B. high heat, low pressure
O C. low heat, high pressure
O D. low heat, low pressure
I NEED HELP ASAP PLEASE
Answer: I am sorry i couldnt answer but this question is beyond me
Explanation:
why are magnesium fluoride and calcium allowed in water
Answer:
calcium allowed in
Explanation:
Why are magnesium, fluoride, and calcium allowed in water?
✓ They’re naturally occurring elements in many springs & aquifers used for water supply purposes - calcium and magnesium are also essential minerals
Draw the circuit symbol that would represent the 9V battery
what is the strongest intermolecular force to be overcome when ethanol is converted from a liquid to a gas?
Answer:
hydrogen bonding
Explanation:
The strongest among them is hydrogen bonding, and the weakest are London dispersion forces.
The strongest intermolecular force to overcome when ethanol is converted from liquid to a gas is hydrogen bonding.
Intermolecular forces are forces that are a weaker force of attraction than intramolecular forces.
Intermolecular forces are forces between molecules and hold these molecules together.
Hydrogen bonding is an example of intermolecular forces between the OH group in the alcohol.
During the conversion of ethanol from liquid to gas state, hydrogen bonding occurs between the partial negative charge in the oxygen and the partial positive charge in the hydrogen.
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Carbon burns with oxygen to produce carbon dioxide gas.
Which of these shows the correct chemical reaction?
O C+0=CO2
O CO, CO2
C +02 + CO2
CO2 = C+0
Answer:
it will help you , but I am not sure it is correct
A ball exerts a force of 10 newtons on an area of 5 cm2 find the pressure with the formula : pressure = force/area
Answer:
2
Explanation:
10/5
answer false or true for each question, (1-5). thanks!
which tissue carrys messages to and from the brain
Answer:
nervous tissues
Explanation:
Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities. ... The cells in nervous tissue that generate and conduct impulses are called neurons or nerve cells. These cells have three principal parts: the dendrites, the cell body, and one axon
credits to the person who provided this info.
Please help!! Need asap due at 11:59
There are more than 118 naturally occurring elements.Seventy five percent of the universe is Carbon .The earths's crust and human body are made of different elements.But Carbon is an element which is abundant in both.Most objects are made of Carbon with approximately one million Compounds known and over being developed and discovered every year.