Answer: D
Explanation:
The car will move to the left because Sam is implying a grater force (3 N < 6 N) but it is traveling at a constant speed because there is still a force being acted upon it. <3
The result of applying forces to a toy car is required.
Option D is correct.
Force applied by Bobby is 3 N to the right
Force applied by Sam is 6 N to the left
Right is taken as positive and left is taken as negative.
m = Mass of toy
a = Acceleration
Net force applied to the toy
[tex]F=3-6\\\Rightarrow F=-3\ \text{N}\\\Rightarrow ma=-3\\\Rightarrow a=\dfrac{-3}{m}[/tex]
So, the toy will move left with a constant acceleration.
Constant acceleration means its speed will be increasing.
So, option D is correct.
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A scientist wants to test the effectiveness of a medicine in treating
headaches. He puts the medicine into cookies and then tells his subjects to
lie down and have a cookie when they have a headache. He asks them to give
him feedback about how well these relaxation techniques work to cure their
headaches. What rule of ethics does this experiment break?
O A. The subjects are not informed that they are taking a medicine.
B. It is likely to harm his subjects.
C. The scientist is taking the work of others by reviewing the
subjects' feedback.
D. It is testing more than one variable at the same time.
what will happen when the rates of evaporation and condensation are equal
A solution is prepared by dissolving 150. grams of NaCl in 500 milliliters of water. What is the
molarity of the solution?
Answer:
Explanation:
The answer should be .00500M
The molarity of the solution is = 5.12M
Molarity of the solutionThe molarity of a solution is the measures the number of moles of a solute per liter of a solution.
Molarity = moles solute/Liter solution
Molar mass of sodium (Na) = 23g
Molar mass of chlorine (Cl) = 35.5g
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
To calculate the quantity of moles in 150g of NaCl,
1mol = 58.5g
xmol = 150g
Cross multiply,
xmol= 150×1/58.5
= 2.56mol
To convert 500mL to Liters,
500/1000 = 0.5 Liters
Substituting into the equation, Molarity = moles solute/Liter solution
Molarity= 2.56/ 0.5 = 5.12M
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____ occurs when the vapor pressure of a liquid is equal to the external atmospheric pressure.
A. Sublimation
B. Compression
C. Boiling
D. Freezing
Answer:
Boiling
Explanation:
c.boiling
choice number 3
If you came upon an aqueous solution in the lab which reacted with a strip of magnesium , you could make the hypothesis that the compound in this solution is :
a . an acid
b . a base
C. a salt
Answer: A
Explanation: Bases Don't react with metals, acids do. Salt tend not to have that sort of reaction either.
Since dilute acids can react with metal strips, the solution must be an acid.
What is an acid?An acid is a substance that produces the hydrogen ions in solution. We should note that one of the properties of acids is that their dilute solutions are able to react with metals to evolve hydrogen gas.
As such, if the solution can react with a strip of magnessium then the solution must be an acid.
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What kind of intermolecular forces between an ammonia molecule and a water molecule? Note: there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force
Answer:
hydrogen bonding
Explanation:
Dipole-Dipole, Dispersion, hydrogen bonding and ion bond
Explain why all other atoms are reactive?
Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Hope this Helps!~
What is the molarity of a solution with 2 moles of HCl in 2000 mL?
Answer:
"1 M" will be the right solution.
Explanation:
The given values are:
Number of moles,
= 2 moles
Volume of solution,
= 2000 mL
or,
= 2 L
Now,
The molarity of the solution will be:
= [tex]\frac{Moles}{Liters}[/tex]
On substituting the values, we get
= [tex]\frac{2}{2}[/tex]
= [tex]1 \ M[/tex]
El carbono de calcio se descompone por la acción del calor en óxido de calcio y dióxido de carbono. a). Escribe la ecuación química ajustada. b). Calcula qué cantidad de dióxido de carbona se forma si reaccionan 150g de carbonato de calcio.
Respuesta:
1.50 moles
Explicación:
Paso 1: Escribir la ecuación química ajustada para la descomposición del carbonato de calcio
CaCO₃ ⇒ CaO + CO₂
Paso 2: Calcular los moles correspondientes a 150 g de CaCO₃
La masa molar de CaCO₃ es 100.09 g/mol.
150 g × 1 mol/100.09 g = 1.50 mol
Paso 3: Calcular los moles de CO₂ producidos a partir de 1.50 moles de CaCO₃
La relación molar de CaCO₃ a CO₂ es 1:1.
1.50 mol CaCO₃ × 1 mol CO₂/1 mol CaCO₃ = 1.50 mol CO₂
Explain how the iron pipes change into rust?
What is the mass of 1.72 moles of sodium nitrate? Use the periodic table and the polyatomic ion resource.
Answer:
[tex]\boxed {\boxed {\sf 146 \ g \ NaNO_3}}[/tex]
Explanation:
To convert from moles to mass, the molar mass is used. This tells us the grams in 1 mole of a substance.
1. Write FormulaWe know the compound is sodium nitrate.
Sodium: NaNitrate: NO₃Sodium has an oxidation state of +1 and nitrate's is -1. When they bond, sodium gives an electron to nitrate and the charges balance out. We don't need to add any additional subscripts.
Sodium nitrate: NaNO₃2. Calculate Molar MassThe molar mass is found on the Periodic Table. It is the same as the atomic mass, but the units are grams per mole. Look up the values for the individual elements.
Na: 22.9897693 g/mol N: 14.007 g/mol O: 15.999 g/molNotice that in the formula, oxygen has a subscript of 3. We must multiply oxygen's molar mass by 3 before adding the other molar masses.
O₃: 3(15.999 g/mol)= 47.997 g/molNaNO₃= 22.9897693+14.007+ 47.997 = 84.9937693 g/mol3. Calculate MassUse the molar mass as a ratio.
[tex]\frac {84.9937693 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]
Multiply by the given number of moles: 1.72
[tex]1.72 \ mol \ NaNO_3 *\frac {84.9937693 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]
The units of moles of sodium nitrate cancel.
[tex]1.72*\frac {84.9937693 \ g \ NaNO_3}{1}[/tex]
[tex]146.1892832 \ g \ NaNO_3[/tex]
4. RoundThe original measurement of moles has 3 significant figures, so our answer must have the same. For the number we found, that is the ones place.
146.1892832The 1 in the tenths place tells us to leave the 6.
[tex]146 \ g \ NaNO_3[/tex]
1.72 moles of sodium nitrate has a mass of approximately 146 grams.
What is the conjugate base of the following acids?
a) HClO4 b) NH4 + c) H2O
d) HCO3 –
3. What is the conjugate acid of the following bases?
a) CN- b) SO4 2- c) H2O
d) HSO4-
Answer:
A
Explanation:
HOPE THIS HELPS
Forensic biologist Manning is looking at a cell sample under the microscope. The cell she sees is oval, with a long tail or flagellum. Immediately, she knows that this is a ________ cell.
red blood
skin
sperm
plant
Answer:
Sperm Cell
Explanation:
PLS HELP ASAP ON BOTH
Answer:
mesosphere
I hope this helps a little bit.
A type of symbiosis where one organism benefits, while the other organism is neutral.
Mutualism
Parasitism
Commensalism
Predation
Answer:
Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected. One species typically uses the other for a purpose other than food.
Why is there an attraction between the two ions in this chemical bond?
Answer:
A metallic bond is a force of attraction between charged metal ions and the electrons that are in the delocalized bond, which covers the assembly of ions. A covalent bond is the force of attraction between the nuclei of atoms, and the electrons shared between them.
Explanation:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond can be generated by electrostatic attraction between charged ions (for example, ionic bonds) or by electron sharing (for example, covalent bonds).
I hope this helps you :)
How many moles of calcium oxide are formed when 3 moles of calcium react with oxygen?
Answer:
3 moles of calcium oxide are formed
Explanation:
Based on the reaction of Calcium Ca, with oxygen, O₂, to produce calcium oxide, CaO is:
2Ca + O₂ → 2CaO
where 2 moles of calcium produce 2 moles of Calcium oxide.
That means, if 3 moles of Ca react in presence of oxygen:
3 moles of calcium oxide are formed
If I have 0.044 mol Ammonia (NH3) molecules, how many atoms of hydrogen do I have?
Answer:
1 Answer. Before you use log you have to multiply the answer of 8.66 mol by 6.02⋅1023 by 3 because the answer of 8.66 mol by 6.02⋅1023 gives you the number of ammonia molecules and in each molecules there are 3 hydrogen atoms present.
Explanation:
HELP WILL GIVE BRAINLIEST NO WEIRD ANSWERS PLSS
Answer:
Solid
Explanation:
The reason is because the liquid aspirin has a plastic cover with a liquid inside and it doesn't take long for out stomach acid to dissolve the cover unlike the Solid aspirin where is slowly dissolves.
Which of the following could be described as exotic? *
a. a pair of sneakers
b. a rare type of flower
Answer:
Exotic is something that’s is unique and you can only find it or this thing in some places. The answer is the rare type of flower.
Explanation:
A partir de 140 g de n2 y una cantidad de h2 se obtuvo 153G de NH³. Cual es el % de rendimiento de la reacción química
Respuesta:
90.0 %
Explicación:
Paso 1: Escribir la ecuación química balanceada
N₂ + 3 H₂ ⇒ 2 NH₃
Paso 2: Calcular el rendimiento teórico de NH₃ a partir de 140 g de N₂
En la ecuación balanceada, participan de N₂: 1 mol × 28.01 g/mol = 28.01 g y de NH₃: 2 mol × 17.03 g/mol = 34.06 g.
140 g N₂ × 34.06 g NH₃ /28.01 g N₂ = 170 g NH₃
Paso 3: Calcular el rendimiento porcentual de NH₃
El rendimiento experimental de NH₃ es 153 g. Podemos calcular el rendimiento porcentual usando la siguiente fórmula.
R% = rendimiento experimental / rendimiento teórico × 100%
R% = 153 g / 170 g × 100% = 90.0 %
Students in a science class prepared flash cards so that they could quiz one another about the
arrangement of the periodic table. One of the flash cards contained information about two
elements, Element L and Element M.
Qualities:
-Atom of element M has two more balances electrons than element atoms of L
- atoms of element L are more reactive than atoms of element M
-both elements are metals
The students had to use the information on n the flash cards to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in the locations that match the information on the flash cards?
Answer:
the periodic table is G.
The periodic table has the elements placed in the locations that match the information on the flash cards is F.
What is periodic table?The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.
The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.
In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.
Thus, the periodic table has the elements placed in the locations that match the information on the flash cards is F.
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In a tug of war, the team on the left pulls with a force of 430 N and the team on the right pulls with a force of 420 N. What is the net force on the rope?
A. 10 N to the right
B. 10 N to the left
C. 420 N to the right
D. 430 N to the left
Answor
c
Explanation:
How many kilojoules of heat must be transferred to a 480-g aluminum pizza pan to raise its temperature from 22°C to 234°C? The specific heat of aluminum in this temperature range is 0.96 J/g.°С. Show your work.
Answer:
97.7 kJ
Explanation:
We'll use the formula for specifc heat: Q=mcΔT
Q= heat/energy (Joules), m= mass (grams), c= specific heat (different for each substance and is usually given)
ΔT= final temperature - initial temperature
Let's check our given units and see if they're the correct, here they all are. Let's plug in what we know.
Q=mcΔT
Q=(480)(0.96)(234 - 22)
Q=(480)(0.96)(212)
Q= 97,690 J
Before we submit an answer, let's check out units. We have our answer in Joules, but we want it it kilojoules, so we'll convert it knowing that:
1000 Joules = 1 kilojoule
97,690J x [tex]\frac{1 kJ}{1000J}[/tex] = 97.7kJ
Explanation:
the answer and the working out is shown above.
A generator can produce both _______________________ (DC), which flows in one direction,and AC current;large power plants produce ___________________.
Answer:
1. direct current. 2. electrical power
Explanation
i believe number 2 is right
It takes a season to create a hybrid, and about 15 years to create a_____.
•It takes a season to create a hybrid, and about 15 years to create a Plant variety.
may this helps you
hope it's correct
bye
What is the mass of 8.83 x 10^23 formula units of Iron (III) oxide, Fe2O3?
Answer:
234.68g
Explanation:
We understood from Avogadro's hypothesis that 1mole of any substance contains 6.02x10^23 atoms. Therefore, 1mole of Fe2O3 also contains 6.02x10^23 atoms
1 mole of Fe2O3 = (56x2) + (16x3) = 112 + 48 = 160g
Now, if 160g of Fe2O3 contains 6.02x10^23 atoms,
Therefore Xg of Fe2O3 will contain 8.83×10^23 atoms i.e
Xg of Fe2O3 = (160x8.83×10^23)/6.02x10^23 = 234.68g
3C6H206
How many atoms are there? Help ASAP!
Answer:
the answer to this is 74 :)
Calculate the percentage composition of SrBr2
Answer:
64.6% of Br and 35.4% of Sr
Explanation:
The percentage composition is obtained defining the percentage in mass of each atom in a molecule.
To solve this question we must find the mass of each atom in 1 mole:
Molar mass Br: 79.904g/mol
Molar mass Sr: 87.62g/mol
The molar mass of SrBr2 is:
79.904g/mol*2 + 87.62g/mol =
159.808g/mol + 87.62g/mol =
247.428g/mol
The percentage of Br is:
79.904g/mol*2 = 159.808g/mol / 247.428g/mol * 100
= 64.6% of Br
And percentage of Sr is:
87.62g/mol / 247.428g/mol * 100
= 35.4% of Sr
Describe what is wrong with this sentence:
"When you kick a soccer ball, you create new
kinetic energy!"
Answer:
You transfer kinetic energy from you foot to the ball.
Explanation:
Energy cannot be created or destroyed.
Answer:
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