Answer:
v = 10 m/s
Explanation:
Given: An object has a kinetic energy of 250 J and a mass of 5 kg
To find: Its velocity
Formula: [tex]KE = \frac{1}{2} mv^2[/tex]
Solution: In classical mechanics, kinetic energy (KE) is equal to half of an object's mass ([tex]\frac{1}{2}[/tex] × m) multiplied by the velocity squared. In this case, an object with a mass of 5 kg (m = 5 kg) is moving at a velocity of 10 meters per second (v = 10 m/s), the kinetic energy is equal to 250 Joules, or ([tex]\frac{1}{2}[/tex] × 5 kg) × 10 m/s².
Therefore, the velocity is v = 10 meters per second.
Name the first 20 elements on the periodic table
Answer:
HYDROGENHELIUMLITHIUMBERYLLIUMBORON CARBONNITROGENOXYGENFLUORINENEON SODIUMMAGNESIUMALUMINUMSILICONEPHOSPHORUSSULFURCHLORINEARGONPOTASSIUMCALCIUMif 50g copper oxide is added to 0.5mol sulphuric acid, calculate the unreacted copper oxide
Answer: 10.3 grams of Copper oxide is left unreacted.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} CuO=\frac{50g}{79.5g}=0.63moles[/tex]
The balanced chemical reaction is:
[tex]CuO+H_2SO_4\rightarrow CuSO_4+H_2O[/tex]
According to stoichiometry :
1 moles of [tex]H_2SO_4[/tex] require = 1 mole of [tex]CuO[/tex]
Thus 0.5 moles of [tex]H_2SO_4[/tex] will require=[tex]\frac{1}{1}\times 0.5=0.5moles[/tex] of [tex]CuO[/tex]
Thus [tex]H_2SO_4[/tex] is the limiting reagent as it limits the formation of product and [tex]CuO[/tex] is the excess reagent.
moles of CuO left = (0.63-0.5) mol= 0.13 mol
Mass of [tex]CuO[/tex] left =[tex]moles\times {\text {Molar mass}}=0.13moles\times 79.5g/mol=10.3g[/tex]
10.3 grams of Copper oxide is left unreacted.
Please this is killing me I have no idea how to answer it it’s due in 10 mins please please help
How much sugar is in a 100 mL, 25% sugar solution? How much water?
When Mendel crossed a plant with green peas and a plant with yellow peas, what color peas did the offspring have? All offspring had green peas. All offspring had yellow peas. Half of the offspring had yellow peas and half had green peas. Some of the offspring had yellow peas and some had yellow-green peas.
TRSUT ME
Explanation: all offspring had yellow pees
Answer: Option B! All offspring had yellow peas.
Explanation:
I got it correct on the test. :D
what is the percentage of oxygen in Li(NO2)3
Answer:
66.2 % of O
Explanation:
Our compound is the lithium nitrite.
LiNO₂
This salt is ionic and can be dissociated: LiNO₂ → Li⁺ + NO₂⁻
We determine the molar mass:
molar mass of Li + 3 . molar mass of N + 6 . molar mass of O
6.94 g/mol + 3. 14 g/mol + 6 . 16 g/mol = 144.94 g/mol
The mass of oxygen contained in 1 mol of lithium nitrite is:
6 . 16 g/mol = 96 g
So the percentage of oxygen present is:
(96 g / 144.94 g) . 100 = 66.2 %
If you have a mixture of baking soda and water, what separation technique would you use?
Answer:
I believe you can evaporate the water.
Explanation:
If you evaporate the water, it leaves the baking soda particles.
help this is an earthquake thing
Answer:
im pretty sure its a push or pull thing
Explanation:
Tensional stress is the stress that tends to pull something apart. It is the stress component perpendicular to a given surface, such as a fault plane, that results from forces applied perpendicular to the surface or from remote forces transmitted through the surrounding rock.
A gas occupies 850.0 mL at a temperature of 37.0 °C. What is the volume at 132.0 °C?
plz help will give brainliest
Answer:
1,110.48 mL
Explanation:
37°C is 310K and 132°C is 405K
V/V' = T/T'
850/V' = 310/405
V' = (850×405)/310
=> V' = 1110.48 mL
PLEASE HELP
If a mineral can scratch a penny, what number is it on Mohs Scale?
Explanation:
z o o o m 85675494491 pwd eu3nFG
How many steps are in a scientific investigation?
explain why when iron is exposed to moist air rust but when aluminium is exposed to moist air it does not rust
Answer:
iron gets rusted as it is more reactive then aluminium and reacts faster with moisture in the air
Explanation:
What is the volume of 2.3 mol Cl2 at 290 K and 0.89 atm?
**SHOW ALL YOUR WORK**
Answer:
62 L
Explanation:
We are given that:
n = 2.3 mol
R = 0.082 L*atm/(mol*K), the ideal gas constant in the required units
T = 290 K
P = 0.89 atm.
therefor:
V = nRT/P
= [(2.3 mol)(0.082 L*atm)(290 K)/(mol*K)]/(0.89 atm)
= 62 L
The volume of 2.3 mol CL2 will be 62 L.
What is volume?A three-dimensional element's area of coverage. The measurement of volume is done in cubic units. Decibels are a unit of measurement for the volume of sound.
Calculation of volume.
Volume can be determined by using the formula.
PV = nRT
where, P = pressure, V = volume, n = number of moles, R = gas constant and T = temperature,
It is given that, n = 2.3 mol, T = 290 K and P = 0.89 atm.
Put the value of given data in volume equation,
V = n RT/ P
V = 2.3 mol × 0.082 × 290 /0.89
V = 62 L.
Therefore, the volume will be 62 L.
To know more about volume.
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Weather along most fronts is usually cloudy with precipitation because the warm air along most fronts usually
A) sinking and cooling, causing water to evaporate
B) sinking and warming, causing water to evaporate
C) rising and cooling, causing water vapor to condense
D) rising and warming, causing water vapor to condense
Cloudy with precipitation occurs due to rising and cooling causing water vapor to condense.
Causes of cloudy with precipitationWeather along most fronts is usually cloudy with precipitation because the warm air present along most fronts usually rising and cooling which causes water vapor to condense. Warm fronts often bring stormy weather as the warm air rises above the cool air mass that makes clouds and storms.
These clouds form in the warm air that is located high above the cool air. As the front passes over a region, the clouds become lower which leads to rainfall so we can conclude that cloudy with precipitation occurs due to rising and cooling causing water vapor to condense.
Learn more about precipitation here: https://brainly.com/question/1373907
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An element reacts with oxygen to give a compound with a high melting point. This compound is also
soluble in water. Name the element.
Answer:
Thus, we can say that the element is calcium. This can be clearly understood as ionic compounds have high melting and boiling points in general such as calcium oxide.
Answer:
The element is Calcium I guess.
Explanation:
Cause calcium oxide has high melting point and is soluble in water.
Which statement best explains a net force?
Answer:
D. The table pushes up on the vase with the same amount of force as gravity pulling it down
Explanation:
For the reaction 1Pb(NO3)2 + 2KI −−> 1PbI2 + 2KNO3, how many moles of lead iodide (PbI2) are produced from 300.00 g of potassium iodide (KI)?
Answer:
moles PbI₂ produced = = 0.9 mole (1 sig. fig.)
Explanation:
Given Pb(NO₃)₂ + 2KI −−> PbI₂ + 2KNO₃
300g ?moles
moles KI = 300g KI/166g/mol = 1.81 mole KI
Rxn ratio for KI and PbI₂ => 2:1
∴ moles PbI₂ produced = 1/2(1.81 mole) = 0.9036144 mole (calculator answer)
= 0.9 mole (1 sig. fig.)
whivh of the following is an example of a synthesis reaction
Answer: hewo, there! your answer is Below
d.) 2CuCl + Cl2yields 2CuCl2
Explanation:
A synthesis reaction, also known as a combination reaction, is where two (or more) compounds combine to form a single compound.
Hope this helps!!!
Have a great day!!
Plz Mark branilest!!!
What is the difference between renewable, and non-renewable resources?
write a chemical reaction which is carried out by catalyst with balanced equation
Answer:
CH2 = CH2 + 1/2 O2 -Ag--> CH2-O-CH2
Explanation:
Producing Epoxyethane by reacting ethene in presence of a silver catalyst with a limited amount of oxygen. The temperature range of the reaction is 250 - 300°C.
The balanced reaction is as follows -
CH2 = CH2 + 1/2 O2 (Reactants) -silver catalyst--> CH2-O-CH2 (Product)
what are some consequences of using land as a resource
Urban development has been linked to many environmental problems, including air pollution, water pollution, and loss of wildlife habitat. Urban runoff often contains nutrients, sediment and toxic contaminants, and can cause not only water pollution but also large variation in stream flow and temperatures.
Will reaction Fe(OH)2 + BaCl2 be going in water?
yes/no and explanation please
Answer:
yes it will react in water as the chem
Based on this experiment which substance has the highest specific heat capacity?
Select one:
a. lead
b. ice
c. granite
d. copper
If red is the color on the top of the spectrum being emitted from the prism, what is the color on the bottom?
violet
yellow
green
blue
Answer:
violet
Explanation:
hope this helps!
Question 5
1 pts
A vinegar solution has a hydrogen ion concentration of 4.0 x 10-4 M. What is the pH?
7.8
5.6
3.4
2.4
Answer:3.4
Explanation:
Which characteristic is shared by Earth and the Moon?
Answer:
The Earth and the Moon both rotate on an axis. They are both terrestrial objects, which means they have a solid, rocky surface. They both receive light and heat energy from the Sun.
Which of the above molecules? how did you know?
1. Sodium Nitrate
2. Carbonic Acid
3. Methane
4. Ammonia
5. Table salt
6. Carbon Dioxide
7. Atmospheric oxygen
8. Hydrochloric Acid
9. Hydrogen peroxide
Answer:
I know Sodium Nitrate,Methane,Carbon Dioxide,Atmospheric Oxygen and Hydrochloric Acid
A balloon is placed in a vacuum chamber (a container that all of the air can be pumped out of) and as the air is removed, the balloon increases in size/volume. This is an example of which gas law? *
Charles' Law
Boyle's Law
Gay-Lussacs Law
Grant's Law
Answer:
Boyle's Law
Explanation:
"Boyle's law, also referred to as the Boyle–Mariotte law, or Mariotte's law, is an experimental gas law that describes how the pressure of a gas tends to increase as the volume of the container decreases."
Calculate the number of grams in 3.99 x 10 20atoms of aluminum.
Answer:
0.018 grams
Explanation:
The number of moles (n) in such number of atoms of Aluminum must be calculated by dividing the number of atoms (nA) by Avagadro's number i.e.
n = nA ÷ 6.02 × 10^23atoms
The number of atoms of Aluminum in this question has been given as: 3.99 x 10^20 atoms.
n = 3.99 x 10^20 ÷ 6.02 × 10^23
n = 3.99/6.02 × 10^(20-23)
n = 0.663 × 10^-3
n = 0.000663moles
Next, we convert the mole value to mass in grams by using the formula;
mole = mass/molar mass
mass = mole × molar mass
Molar mass of Al = 27g/mol
mass (g) = 0.000663 × 27
mass = 0.0179
mass of Aluminum is 0.018grams
Select all types of muscles.
Skeletal
ℍ
Cardiac
Stretch
Smooth
Answer:
Skeletal
Cardiac
Smooth
Explanation:
The body contains three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscl
How many moles are present in 1.25x1023 molecules of salt (NaCl)?
Answer:
0.21 mole of NaCl
Explanation:
From the question,
using Avogadro's Constant,
1 mole of every compound contains 6.02×10²³ molecules of that compound.
I.e
1 mole of NaCl ⇒ 6.02×10²³ molecules of NaCl
x moles of NaCl ⇒ 1.25××10²³ molecules of NaCl
Solving for x,
x moles of NaCl = (1 mole of NaCl)×(1.25×10²³ molecules of NaCl)/(6.02×10²³ molecules of NaCl)
x moles of NaCl = (1×1.25×10²³)/6.02×10²³
x = 0.208 mole of NaCl
x ≈ 0.21 mole of NaCl