Answer:
0.5kg
Explanation:
Given parameters:
Speed of the object = 12m/s
Kinetic energy = 36J
Unknown:
Mass of the object = ?
Solution:
Kinetic energy is the energy due to the motion of a body. It is mathematically expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
Insert the parameters and solve;
36 = [tex]\frac{1}{2}[/tex] x m x 12²
36 = 72m
m = 0.5kg
mass in grams of 3.32 mol k
Answer:
129.8 grams
Explanation:
Im a bit confused of what your are asking but if your are asking the mass in grams of K (Potassium) it is very easy dont worry
You multiply mols x Molecular weight.
So
3.32x 39.1= 129.8 grams
What does oxygen to do to iron
how many moles are in 8.32 times 1024 molecules of CO2
Answer:
13.8 mol CO₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
8.32 × 10²⁴ molecules CO₂
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]8.32 \cdot 10^{24} \ molecules \ CO_2(\frac{1 \ mol \ CO_2}{6.022 \cdot 10^{23} \ molecules \ CO_2} )[/tex] = 13.816 mol CO₂
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
13.816 mol CO₂ ≈ 13.8 mol CO₂
calculate the number of atoms in 2.5 mol manganese.
Answer:
1.5 × 10²⁴ atoms Mn
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
2.5 mol Mn
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]2.5 \ mol \ Mn(\frac{6.022 \cdot 10^{23} \ atoms \ Mn}{1 \ mol \ Mn} )[/tex] = 1.5055 × 10²⁴ atoms Mn
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
1.5055 × 10²⁴ atoms Mn ≈ 1.5 × 10²⁴ atoms Mn
1-calculate the mass of 4 moles of Na
2-what is the mass of 0.3 moles of water H2o H:1 O:16
3-compute the number of moles found in 10g of ethanol C2H5OH C:12 O:16
please help me as fast you can
1. 92 g
2. 5.4 g
3. 0.217 moles
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt n=\dfrac{m}{MW}[/tex]
1. the mass of 4 moles of Na(MW= 23 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=4\times 23\\\\mass=92~g[/tex]
2. the mass of 0.3 moles of water(MW=18 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=0.3\times 18\\\\mass=5.4~g[/tex]
3. the number of moles found in 10g of ethanol C2H5OH(MW=46 g/mol) :
[tex]\tt mol=\dfrac{10}{46}\\\\mol=0.217[/tex]
I will mark brainliest
Answer:
d
Explanation:
it's the only one that seems to make sense
Write one equation each for the decomposition reactions where energy is supplied in the form of (a) electricity and
Answer:
Electrolysis of water
Explanation:
The electrolysis of water is a decomposition reaction in which electricity is used to break down a compound into simpler molecules.
Decomposition of water is carried out in the Hofman Voltameter.
This process is achieved by passing current through an acidified water.
The expression is given as:
2H₂O → 2H₂ + O₂
Write the complete and net ionic equation for the following reaction:
Al2(SO4)3(aq) + Mg(OH)2(aq) → MgSO4(aq) + Al(OH)3(s)
Answer:
Al2(SO4)3 + 3Mg(OH)2 → 2Al(OH)3 + 3MgSO4
Explanation:
Marcel conducts an experiment to test which stain remover works best on mustard stains. He wants to make sure that he does not make mistakes and has correct data in his experiment. What should Marcel do to make sure that his data are correct? conduct a similar experiment with a different washing machine ask other students to conduct related experiments at their homes ask his sibling to conduct the same experiment using his washing machine repeat the experiment several times with the same variable and constants
Answer: Repeat the experiment several times with the same variable and constants.
Explanation: The experimental procedure should be performed many times so as to determine the effect of the stain remover on mustard stain in different conditions and while using different variables such as water and type of machine used. This will tell how useful the stain remover in all conditions provided to check the accuracy of the stain remover.
Hope this help!!! :)
Answer:
C
Explanation:
if his brother does the expire end it is replication if he was to do the same expirement with the same variables then the same outcome would come out
Which order shows decreasing wavelength?
gamma → ultraviolet → infrared → radio
infrared → gamma → radio → ultraviolet
radio → infrared → ultraviolet → gamma
ultraviolet → radio → infrared → gamma
Answer:
The answer is c radio --> infrared --> ultraviolet --> gamma
Explanation:
I just did it
Answer:
C
Explanation:
just did it
A 1.87 mol sample of Ar gas is confined in a 45.5 liter container at 23.6 °C.
If the temperature of the gas sample is raised to 46.1 °C holding the volume constant, the average kinetic energy will
a. increase
b. remain the same
c. not enough information to answer the question
d. decrease
Answer:
a. increase
Explanation:
Based on the kinetic molecular theory of gases, the average kinetic energy of the system will increase.
The average kinetic energy is heat If temperature increases, heat of a system will also rise. According the kinetic molecular theory "the temperature of the gas is a measure of the average kinetic energy of the molecules"Therefore, due to the increase in temperature, the average kinetic energy of the system increases.
CHOOSE ONE AND I WILK GIEV YOU BRAINLIEST AND DONT GUESS PLEASE!!!..
Answer:
c
Explanation:
Calculate the pH when 25.0ml of 0.90M CH3COOH is mixed with 25.0ml of 0.45M NaOH.
pH of mixed solution = 4.3
Further explanationA buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solution consists of weak acids and their salts.
[tex]\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}[/tex]
valence according to the amount of salt anion
mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol
mol NaOH = 25 ml x 0.45 = 11.25 mlmol
ICE method :
Reaction
NaOH + CH₃COOH ---> CH₃COONa + H₂O
11.25 22.5
11.25 11.25 11.25 11.25
11.25 11.25 11.25
mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵
Then [H⁺]=
[tex]\tt [H^+]=5.10^{-5}.\dfrac{11.25}{11.25\times 1}\rightarrow salt~valence=1\\\\(H^+]=5.10^{-5}\\\\pH=5-log5=4.3[/tex]
Why does the reaction proceed more quickly when the surface area is increased?
The reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
What is Collision theory?Collision theory states that for a chemical reaction to proceed, it should achieve these conditions-
Molecules/atoms must collideThe particles must collide in right orientationThe particles must collide with enough energyIncreasing the surface area increases the probability of effective collisions. It thus increases the probability of the three conditions being achieved and results into increase in the frequency of collision and thus increases the rate of reaction.
Therefore, the reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
Learn more about Collision Theory, here:
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two students noted that the acceleration of a car was =40 k/m squared . the fiesta student , "that can't be right . you can't have a negativo acceleration ."second student said , "that can't be right , you can't have seconds squared .
what would you say to each student to help them More better understand how acceleration Is described
PLEASE ANSWER ASAP,FOR MY SCIENCE TEST
Answer:
First one: Yes, It can be negative.
Explanation:
First one: The reason you can have negative acceleration is that acceleration can slow down, or decelerate, causing the negative acceleration.
What is the order of complexity of solids from least to greatest?
Explanation:
The solids can be classified on the basis of bond they are joined with. There are four types of solids on the basis of bond. There are four type of crystalline solids: namely, molecular solids, network solids, ionic solids, and metallic solids. The molecular and the structure of the solid determines its properties likes conductivity, solibility, heat conductivity, and density. Solids are incompressible and rigid as there molecules are fixed in place.
Answer:
Atoms, Molecules, Extended Structures, and Substances
Explanation:
High arky of solids
Which element has the smallest atomic radius?
A-Na
B-H
C-Li
D-K
Answer:
B Hydrogen
Explanation: Hydrogen is the smallest element.
You need 150g of pure lithium for an experiment you're doing. You have 675g of lithium oxide (Li2O). Can you extract all the lithium you need from the amount of compound you have? Show your reasoning.
Answer: Yes we can extract all the lithium from the amount of compound we have.
Explanation:
To calculate the moles :
[tex]moles=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Moles of} Li=\frac{150g}{7g/mol}=21.4moles[/tex]
[tex]\text{Moles of} Li_2O=\frac{675g}{30g/mol}=22.5moles[/tex]
[tex]2Li_2O\rightarrow 4Li+O_2[/tex]
According to stoichiometry :
2 moles of [tex]Li_2O[/tex] produce 4 moles of [tex]Li[/tex]
Thus 22.5 moles of [tex]Li_2O[/tex] will produce=[tex]\frac{4}{2}\times 22.5=45moles[/tex] of Li
As 21.4 moles is a lesser quantity than 45 moles, thus it can be produced
Yes, you can extract all the lithium you need from the compound
We'll begin by calculating the mass of lithium, Li in 1 mole of Li₂O. This can be obtained as described below:
1 mole of Li₂O = (2×7) + 16
1 mole of Li₂O = 14 + 16 = 30 g
SUMMARY
30 g of Li₂O contains 14 g of Li.
With the above information in mind, we can determine the mass of Li in 675 g of lithium oxide, Li₂O. This can be obtained as follow:30 g of Li₂O contains 14 g of Li.
Therefore,
675 g of Li₂O Will contain = (675 × 14)/30 = 315 g of Li.
From the calculation made above, we can see that there are 315 g of Li in 675 g of Li₂O. Thus, we can conclude that 150 g of Li can be extracted from the compound (i.e 675 g of Li₂O)Learn more: https://brainly.com/question/15381525
In which direction is this wave traveling?*
(1 Point)
A. up
B. down
C. to the left
D. to the right
Answer:up
Explanation:
What volume (liters) of aqueous 0.325 M nitric acid is required to react completely with 3.68 g barium hydroxide?
Volume (liters) of aqueous 0.325 M nitric acid is 0.132 L
Further explanationReaction
2HNO₃ + Ba(OH)₂ → Ba(NO₃)₂ + 2H₂O
mass of Ba(OH)₂ = 3.68 g
mol Ba(OH)₂(MW=171,34 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{3.68}{171,34 g/mol}\\\\mol=0.0215[/tex]
From the equation, mol ratio of HNO₃ : Ba(OH)₂ = 2 : 1, so mol HNO₃:
[tex]\tt mol~HNO_3=\dfrac{2}{1}\times 0.0215=0.043[/tex]
Molarity of HNO₃ = 0.325, then the volume of HNO₃ :
[tex]\tt V=\dfrac{n(mol)}{M(molarity)}\\\\V=\dfrac{0.043}{0.325}\\\\V=0.132~L[/tex]
A chemist has 3.55x1022 molecules of nitrogen monoxide. How
many moles of nitrogen monoxide does the chemist have?
Answer:
0.059 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.55 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.05897...[/tex]
We have the final answer as
0.059 molesHope this helps you
A pH of 1 there are a lot of ______ in a solution. 2.A pH of 14 there are a lot of ______ in a solution.
Answer:
Hydrogen or hydroxonium ions in the solution
Hydroxyl ions in the solution
Explanation:
A pH of 1 shows there is a lot of hydroxonium ions in the solution and a pH of 14 shows there is a lot of hydroxyl ions in the solution.
The pH scale ranges from 1 to 14 As the values tends towards 1, the acidity increases due to concentration of hydroxonium ions in the solution. As the pH tends towards 14, the basicity increases due to the concentration of hydrogen ions in the solution.What is the name of cells that have the ability to develop into different
kinds of cells?
Answer:
stem cells
Explanation:
hope it helps
What type of chemical reaction has only one product?
Answer:
synthesis reactions
Explanation:
Just as synthesis reactions can only form one product, decomposition reactions can only start with one reactant
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Which group has the greatest metallic character?
Answer:
Group 1 metals or the alkali metals
Explanation:
The group 1 elements are all metals except for hydrogen, the first element in the group. Group 1 metals have one valence electron in their outermost shell. The metallic character increases as one goes down the group.
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Group 1 metals have the greatest metallic character due to the ease with which they donate or lose their one valence electron. As the atomic radius increases on going down the group, their metallic character increases. Also, due to screening effect of the inner electrons on the valence electron from the positive nuclear charge of the nucleus, metallic property increases on going down the group.
If a 200 kg person stands next to a 100 kg person. Which person would have a larger gravitational attraction?
Answer:
200 kg
Explanation:
the 200 kg person is heavier due to gravity's force the 100 kg person has less force than the other person
Answer:
massive one that is 200kg
Explanation:
Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
. For the reaction 2HNO3 + Mg(OH), → Mg(NO3)2 + 2H20, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO,?
Mass of Magnesium nitrate produced : 593.2 g
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
2HNO₃ + Mg(OH)₂ → Mg(NO₃)₂ + 2H₂0
mol HNO₃ = 8
From the equation, mol ratio of HNO₃ : Mg(NO₃)₂ = 2 : 1, so mol Mg(NO₃)₂ :
[tex]\tt \dfrac{1}{2}\times 8=4~moles[/tex]
Mass Mg(NO₃)₂(MW=148,3 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=4\times 148,3 g/mol\\\\mass=593.2~g[/tex]
40 POINTS PLS HELP!
1. A description of what genetically modified foods are.
2. A list of crops that are typically genetically modified.
3. An explanation of why crops are genetically modified.
4. A description of how crops are genetically modified.
5. A list of how genetically modified crops affect society and the environment.
___________________________________
Same as top but these are questions:
1. What are genetically modified foods?
2. What crops are typically genetically modified?
3. Why are crops genetically modified.
4. How are crops genetically modified?
5. how do genetically modified foods affect society in the environment.
___________________________________
And PLS, don't use this just for points!
Thank you!
Answer:
1. Foods that have changes that are chemically introduced.
2. corn soybeans apples etc
3. sot they last longer or look better
4. new dna is placed in them and their seeds
5. they are not as good for humans
Explanation:
Please help ..
What is the molarity of a 0.30-liter solution containing 0.50 moles of H2SO4?
A 1.7M
B 0.6M
C 0.8M
D 0.15M
Answer:
1.7M
Explanation:
Given parameters:
Volume of solution = 0.3L
Number of moles = 0.5moles
Unknown:
Molarity = ?
Solution:
The molarity of a substance is the number of moles of solute that can be found in the volume of a solution.
Molarity = [tex]\frac{number of moles }{volume}[/tex]
Insert the parameters and solve;
Molarity = [tex]\frac{0.5}{0.3}[/tex] = 1.7M
How do the number of protons, rumber of neutrons, and the mass number relate to each other
Answer:
Protons are the atomic number and for each element they never change.
Electrons are equal to the atomic number unless it is an Ion (Positive charge means it has less negative means it has more)
Mass number is Protons+Nuetrons
Explanation: