[tex]19~ \text{kcal} = 19 \times 1000 ~\text{cal } = 19000~ \text{cal} = 19000 \times 4.184~ \text{J} = 79496~ \text{J}[/tex]
A force of 20 N
acts upon a 5 kg
block. Calculate
the acceleration
of the object.
Answer:
0.25m/s²
Explanation:
here
weight(w)-20 N
mass(m)-5 kg
acceleration (g) -?
we know
w=mg
g=m/w
=5/20
=0.25 m/s²
Answer:
acceleration=0.04g/s
Explanation:
force=Ma
20N=5kgXa
5kg=5000g
20N=5000Xa
20N=5000a
divide both sides by 5000
acceleration=0.04g/s
If you add 5.9 mL 4.00 mL of pure water to 28.752 mL 6.00 mL of 0.56 M 0.750 M NaCl solution, what is the concentration of sodium chloride in the diluted solution?
pick one volume and concentration as a sample
5.9 ml + 28.752 ml = 34.652
M1V1=M2V2
0.56 x 28.752 = M2 x 34.652
M2=0.464 M
The rules for naming alkanes, alkenes, and alkynes are
A) very different
B) almost the same
C) specific for each of them
almost the same
just different in bond
30. An astronaut's mass is 70 kg. The acceleration due to gravity on Mar is 3.73 m/s. The astronaut's weight on Mars is
most nearly
Answer:
261.1 N
Explanation:
Force = mass × acceleration due to gravity
Force is also known as weight. So:
Weight = 70 × 3.73 = 261.1 N
Net ionic equation for Calcium hydroxide reacting with ammonium Chloride?
Answer:
Step 1: Write the balanced chemical equation with the states first:
Ca(OH)₂ (aq) + 2NH₄Cl (aq) → CaCl₂ (aq) + 2NH₃ (g) + 2H₂O (l)
Step2: Write the complete ionic equation, break only the aqueous ones only :
Ca²⁺ + 2OH⁻ + 2NH₄⁺ + 2Cl⁻ → Ca⁺² + 2Cl⁻ + 2NH₃ (g) + 2H₂O (l)
Step 3: cancel the spectator ions ( the ions which stay the same like calciumn and chlorine ions here)
2OH⁻ + 2NH₄⁺ → 2NH₃ (g) + 2H₂O (l)The magnetite has a mass of
42.0 g and a volume of 8.1 cm3.
What is the density of the
magnetite sample?
Answer:
5.185 gcm⁻³
Explanation:
The formula to find density is:
Density = [tex]\frac{mass}{volume}[/tex]
Density = [tex]\frac{42}{8.1}[/tex]
Density of magnetite sample = 5.185 gcm⁻³
Answer: 5.185
Explanation: the formula to find the density is
Density = mass/volume
Density = 42/8.1
Density of magnetite sample = 5.185 g/cm3
Question 9 of 10
Why is gravity the dominant force among planets?
O A. It acts at long distances.
B. Gravity is the strongest force.
C. Gravity increases with distance.
D. It depends on charge separation.
Gravity the dominant force among planets because it acts at long distances.
Why is gravity the dominant force among planets?Gravity is the weakest force as compared to the forces but it is the most dominant force because it has the longest range.
So we can conclude that Gravity the dominant force among planets because it acts at long distances.
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WILL GIVE BRAINLIEST!
A certain reaction is endothermic in the forward direction. The reaction has less moles of gas on the product side. Which of the following stresses would increase the yield of the products (shift right)?
•Decreasing the temperature
•Decreasing the reactant concentration
•Increasing the volume
•Increasing the pressure
answer is either A or D
Answer:
A
Explanation:
Increasing the the temperature would favour the endothermic reaction which is the forward direction however increasing the pressure would make the reaction try to counteract this change by favouring the reaction that would create more products so the equilibrium will shift left instead of right.
Hope this helps.
PLEASE HELP
Predict the Eº values for all (6) combinations of the following: Cu(s) and Cu(NO3)2(aq) Fe(s) and Fe(NO3)3(aq) Zn(s) and Zn(NO3)2(aq) Pb(s) and Pb(NO3)2(aq)
Answer:
Is this math? Cause as a fourth grader, I can do Algebra, but not this.
Explanation:
The concentration of a solution refers to the amount of solute that has been dissolved in a given amount of solute. consider the solution seen. here select all the ways that this solution could be made more concentrated.
A.) increase the amount of solute
B.) decrease the amount of solute
C.) decrease the amount of solvent
D.) increase the amounts of solute and solvent
4.8 moles of Kl are dissolved in 850 mL of water. What is the molarity of the solutions?
Which statement describes thermal energy?
the energy that is associated with electric fields
the energy that is stored in chemical bonds
the energy that is associated with the pull of gravity
the energy that is associated with temperature
Answer:
"the energy that is associated with temperature" ✔️
Explanation:
Thermal Energy = Heat
Ex: The sun has thermal energy.
Ex: The oven radiates thermal energy
I hope this helps, you understand!!
The statement describes thermal energy is as
the energy that is associated with temperature.So, option D is correct one
What is the thermal energy?The energy posses by the particles or system due to their temperature is called thermal energy.
Thermal energy is produced when the atoms and molecules vibrate faster because of rise in temperature.The thermal energy cannot be converted into useful work.The source of thermal energy is fossil fuel like natural gas, coal and oil . The solar heat, electric heat, geothermal heat and heat pump are also sources of thermal energy.The simple example of thermal energy is boiling of water on stove.To learn more about thermal energy here.
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The space race was between
a.
the United States and China.
b.
Great Britain and the Soviet Union.
c.
the Soviet Union and China.
d.
the United States and the Soviet Union.
Answer:
the United States and the Soviet Union.
Explanation:
Basically we were in toe to toe with the russians for space explorations like who's gonna get to space first or moon or do such explorations
I WILL GIVE BRAINLIEST FOR THE FIRST RIGHT QUESTION
Construct an argument supported by evidence to describe the connections between the number of people in a society and the amount of plastic waste that they generate.
I will mark as brainliest if correct
Which of the following is described by the equation H2O(l) --> H2O(s) + heat?
A. Melting
B. Condensing
C. Freezing
D. Evaporating
Answer:
[A] Melting
Explanation:
From the giving it means:
H2O(s) - Solid {Ice}
H2O(l) - Liquid {water}
So the equation is:
Liquid ⇒ Solid + Heat
Water ⇒ Ice + Heat
Hence, if you add ice and heat it equal to melting.
Therefore the correct answer is [A] Melting.
Kavinsky
Answer: C. Freezing
Explanation:
6.45g of lithium reacts with 9.2g of oxygen gas to produce lithium oxide.How many grams of Li20 are formed? Hint: write the balanced chemical equation first.
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please try to keep questions acedemic related
it does no good for questions like this to be on here when others need help, try to keep your questions..
- Partained to the particular subject
- presented in the correct language and maner
- understandable and with all the information needed
no hard feelings, though this question and answer will be deleted by moderators soon so just keep all that in mind ^^
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SPEED
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1X
The ice record shows a period in Earth's history when there was an ice age and the global average temperature was
much colder. During this time, the ice record shows the amount of carbon dioxide in the atmosphere decreased, but the
amount of energy from the sun did not change. How did the the total amount of energy in the Earth system change, how
did this change happen, and how did it contribute to the ice age?
Hand Ir
Sig
The average temperature during the ice age was around 46 degrees Fahrenheit although the polar regions were far colder, around 25 degrees Fahrenheit which is colder than the global average.
What is an average temperature?The monthly mean temperature: It is calculated by adding the daily mean temperatures for each day of the month and dividing the total by the number of days in a month.
The average global temperature during the period known as the Last Glacial Maximum from roughly 23,000 to 19,000 years ago was about 46 degrees Fahrenheit (7.8 degrees Celsius), some 13 degrees Fahrenheit (7 Celsius) colder than 2019, the researchers said.
A team of scientists has nailed down the temperature at the peak of the last ice age, a time known as the ast Glacial Maximum, to about 46 degrees Fahrenheit.
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aluminum + sulfur aluminum sulfide
10.8 g 19.2 g (REACTANT/PRODUCT)??
Answer:
Al + S -> Al2S3
Al and S are the reactants, Al2S3 is the product
Explanation:
What volume of 0.194 MNa3PO4 solution is necessary to completely react with 85.5 mL of 0.109 MCuCl2 ?
Answer:
35.9 ml
Explanation:
Start with the balanced equation:
3CuCl2(aq)+2Na3PO4(aq)→Cu3(PO4)2(s)+6NaCl(aq)
This tells us that 3 moles of CuCI2 react with 2 moles Na3PO4-
∴ 1 mole CuCl2 will react with 2/3 moles Na3PO4
We know that concentration = moles/volume i.e:
c= n/v
∴n=c×v
∴nCuCl2=0.107×91.01000=9.737×10−3
I divided by 1000 to convert ml to L
∴nNa3PO4=9.737×10−3×23=6.491×10−3
v=nc=6.491×10−30.181=35.86×10−3L
∴v=35.86ml
An element P with electron configuration 2,
8, 2 combined with another element Q with
electron configuration 2, 8, 7. The chemincal
bond between P and Q is
A. covalent B. coordinate
C. metallic D. electrovalent
Answer:
Electrovalent.
Explanation:
[tex]\text{The element P is }~ _{12}Mg\\\\\text{The element Q is }~ _{17}Cl\\\\\text{The chemical bond between P and Q is ionic or electrovalent bond.}\\\\Mg^{2+} + 2\text{Cl}^{-} \rightleftharpoons MgCl_2[/tex]
CH3-CH=CH3-CH what is the name of this structure?
Answer:
if you meant CH3-CH=CH-CH3, the IUPAC name is 2-butene.
Commercial agriculture can often lead to water-quality problems. In one to two sentences, explain how two of those problems occur.
Commercial agriculture often leads to water-quality problems as a result of run-offs and agrochemical discharge.
How do water-quality problems occur in agriculture?Most commercial agriculture requires the use of agrochemicals and fertilizers.
Agrochemicals such as insecticides and herbicides are poisonous to aquatic biodiversity when run-offs are discharged from farmlands to water bodies.
Fertilizer run-offs into water bodies also cause nutrient enrichment, leading to eutrophication.
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A customer experiences worsening side effects in response to a prescription. What do you suggest to them?
Answer:
Probably stop taking the prescribed durg and contact your pharmacist and your doctor that gave you your prescription asap.
Explanation:
Both of those health professionals will assist the patient in understanding how to go about the next steps for side effect relief.
What occurs as the atomic number of the elements in period to increases
The answer is moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
What is Atomic Number ?The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus.
Atomic Number (generally ) = Number of Protons
The atomic number can be used to uniquely identify ordinary chemical elements.
In an ordinary uncharged atom, the atomic number is also equal to the number of electrons.
The atomic number increases moving left to right across a period and subsequently so does the effective nuclear charge.
Therefore, moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
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Calculate the mass in grams for 2.28 moles of N2.
228 g
63.9 g
6.39 g
2.28 g
Answer: 63.9
Explanation:
how does air pollution cause global warming
Answer:
Air pollution affects the compounds in the air, causing heat to change dramatically over time in the atmosphere.
What is the BEST explanation for how stirring the salt into the glass of water increases the rate of solution?
A) Stirring increases the surface area of the solute
B) The solute particles do not stay on the bottom of the glass
C)Stirring increases random motion and contact between solute and solvent
D) Stirring decreases the kinetic energy of the solution and aids in dissolving
Oxidation state of Nitrogen in NO ?
Explanation:
Oxidation state of Nitrogen in NO is +2
Answer:
+2
Explanation:
Convert 5.50 mol of MgO to g.
Answer:
5.50 moles of magnesium oxide is 221.6742 grams
Explanation:
to do this you multiply the number of moles by the molar mass
