Kito puts his spoon into a helping of fresh, hot, mashed potatoes as shown in the figure. Which process takes place when the two objects come together
A. The temperature of the spoon increases, but its thermal energy does not change
B. Energy in the form of heat is transferred from the warmer mashed potatoes to the cooler spoon
C. The thermal energy of both the mashed potatoes and the spoon increases as energy in the form of heat is transferred between them
(please answer quickly, I don't want to fail this test due to being stuck on this one)
Answer:
B. is the answer
Explanation:
Energy in form of heat is transferred from the warmer mashed potatoes to the cooler spoon.
When some solid ammonium nitrate was dissolved in water the temperature decreased from 22 oC to 3 oC. What can be deduced from this observation?
The dissolving is endothermic and ∆H is positive. The dissolving is endothermic and ∆H is negative. The dissolving is exothermic and ∆H is positive. The dissolving is exothermic and ∆H is negative.
Which is a correct statement about an endothermic reaction?
A. The bonds in the reactants are stronger than in the products and ∆H is positive.
B. The bonds in the products are stronger than in the reactants and ∆H is positive.
C. The bonds in the reactants are stronger than in the products and ∆H is negative
D. The bonds in the products are stronger than in the reactants and ∆H is negative.
Which is a correct statement about the following() enthalpy level diagram of a reaction? A. The reaction is exothermic and △H is positive.
E. The reaction is exothermic and △H is negative.
F. The reaction is endothermic and △H is positive.
G. The reaction is endothermic and △H is negative.
Which statements are correct for all exothermic reactions?
I. The products are more stable than the reactants.
II. The bonds in the products are stronger than the bonds in the reactants
III. The enthalpy of the products is less than the enthalpy of the reactants
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Answer:
1. The dissolving is endothermic and deltaH is positive
2. A. The bonds in the reactants are stronger than in the products and deltaH is positive
3. I can't see the diagram so I don't know the answer (it's a glitch on my part not yours, my school district blocks images automatically on their rented chromebooks)
4. A. I, and II only
Explanation:
When we measure the temperature of a solution, and we notice that the temperature of the water is decreasing, then this is an endothermic reaction..
The dissolved solute (the "invisible" ions) are absorbing the heat, causing the water around it to be colder.. **Heat moves from hot to cold, so the water is losing it's heat and the dissolving (dissolved solute) is gaining heat, meaning that it is Endothermic.
When a reaction is endothermic, the energy that is required to break bonds and attractive forces is greater than the energy required to form bonds and attractive forces. This means that the bonds in the reactants are stronger than in the products and deltaH is positive. Since we know that the energy in the reactants is greater, there is more heat in the reactants. This is also why the dissolved solute would be gaining heat.. If the energy of the reactants is stronger, when it breaks, it will release a lot of energy that the dissolved solute will be absorbing.
Think, heat (q, released or absorbed) is measured in Joules, the higher the Joules, the hotter something will be. So, if the heat (q) is negative, that represents the amount of Joules (heat) being released. If it is positive, that is the amount being absorbed. So, if heat is being absorbed then deltaH is positive.
If the diagram shows the products being at a higher energy level than the reactants, then the diagram shows an endothermic reaction.. If we see that the energy from the products is greater, than the energy of the system increased as it absorbed energy from its surroundings.
If the diagrams shows the reactants being at a higher energy level than the products, then the diagram shows an exothermic reaction.. Think of it this way, if we see that the energy from the reactants was greater, than the energy of the system was originally greater than the surroundings, but now (observing the products), it is not, as energy was lost to the surroundings, making this an exothermic reaction.
For exothermic reactions, the energy that is required to break bonds and attractive forces is less than the energy required to form bonds and attractive forces.. This means that energy in the products are greater, so as these bonds are broken and energy is released, the surroundings gain energy/heat. This means that the energy is favorable (more stable), the more negative our potential energy (energy of the system) is, the more favorable our process is.
10. Benzene deactivating group is:
a. -OH
b. --CH3
c. -C2Hs
d.-CI
Answer:
CH3
Explanation:
Which sequence of coefficients will balance the following equation?
Na (s) + O2 (g) → 2Na20 (s).
Answer:
option c. 4,1,2
Explanation:
No. of atoms of each element in reactant is equal to that of products
A 18.5 gram sample of metal was added to a graduated cylinder that had
an initial volume of 45.50 mL. The water level raised to 54.10 mL. Using
this information, calculate the density of the metal. *
Answer:
[tex]d=2.15g/mL[/tex]
Explanation:
Hello there!
In this case, since the density of the metal is computed as shown below:
[tex]d=\frac{m}{V}[/tex]
We need to calculate the volume of the solid by subtracting the final volume and the initial volume of water:
[tex]V=54.10mL-45.50mL\\\\V=8.60mL[/tex]
Thus, we obtain:
[tex]d=\frac{18.5g}{8.60mL}\\\\d=2.15g/mL[/tex]
Best regards!
please help I really need this
Answer:
You eat a hamburger and breathe in oxygen.
Oxygen goes immediately from your lungs to blood vessels to cells.
Food molecules in the hamburger are broken down into glucose in the digestive system.
Explanation:
Which example is NOT a chemical change? *
A. Hydrogen peroxide bubbles in an open wound on your skin.
B. Piece of pizza digested when eaten.
C. Rotting Easter eggs. .
D. Dissolving salt in water.
Answer:
The answer would be D as no chemical change is occuring.
Explanation:
Answer:
D. Dissolving salt in water.
Explanation:
No chemical change is actually occurring when salt is added to water
yup help plssss.......
Answer:
D
Explanation:
because it's so hot that it's almost to the point of changing to another element
Answer:
To be honest with you I think it is A or D
Explanation:
bc I said so
Explain the following statement from the text: “Magnets exert magnetic force as a result of magnetic field.
Answer:
All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction.
Magnets exert magnetic force as a result of magnetic field attraction between opposite poles and magnetic field repulsion between same poles.
What are magnets?Magnets are the substance in which north and south poles present and they show attraction towards the different poles and repulsion towards the same pole.
Due to presence of this poles magnets have their own magnetic field and direction of this field governs from north to south pole. Due to this magnetic field magnets exert magnetic force towards some metals like iron and show attraction.
Hence, due to presence of different poles in a magnet, they exerts magnetic force.
To know more about Magnets, visit the below link:
https://brainly.com/question/14997726
If 0.332 mol of zinc reacts with excess lead(IV) sulfate, how many grams of zinc sulfate will be produced in the reaction?
Answer:
53.6 g
Explanation:
Step 1: Write the balanced equation
2 Zn + Pb(SO₄)₂ ⇒ 2 ZnSO₄ + Pb
Step 2: Calculate the moles of ZnSO₄ produced from 0.332 moles of Zn
The molar ratio of Zn to ZnSO₄ is 2:2. The moles of ZnSO₄ produced are 2/2 × 0.0332 mol = 0.0332 mol.
Step 3: Calculate the mass corresponding to 0.332 moles of ZnSO₄
The molar mass of ZnSO₄ is 161.44 g/mol.
0.332 mol × 161.44 g/mol = 53.6 g
what is the characteristics of solid
Answer:
they have there own shape that is not manipulated and they are typically hard
Explanation:
Writing Prompt/Open-Ended Question
What are limiting reactants? How can you predict how much of a product you will create if you know how much of a reactant you used?
Answer:
If you are given a chemical equation and specific amounts for each reactant in grams, you have to follow these steps, in order, to determine how much product can possilby be made:
1. Convert each reactant into moles of the product.
2. Determine which reactant is the limiting reactant.
3. Convert the moles of product, from the limiting reactant, to grams.
Explanation:
Which Kingdom does the organism belong to?
Animalia
Protista
Fungi
Plantae
pls help guys
Which of the following was a major goal of the National Association for the Advancement of Colored People when it
was formed in 1909?
to end integration
to end segregation
to support black nationalism.
O to support the accommodationist approach
When’s end
Answer:
to end segregation
Explanation:
National Association for the Advancement of Colored People (NAACP), interracial American organization created to work for the abolition of segregation and discrimination in housing, education, employment, voting, and transportation; to oppose racism; and to ensure African Americans their constitutional rights.
To end segregation was a major goal of the National Association for the Advancement of Colored People when it was formed in 1909. Therefore, the correct option is option B.
What is NAACP?
A group of individuals led by W. E. B. Du Bois, Mary's White Ovington, Moorfield Storey, and Ida B. Wells founded the National Association over the Advancement of Coloured People (NAACP) in 1909 as an interracial effort to advance fairness for African Americans. Roy Wilkins and Thurgood Marshall were among the group's leaders.
"To ensure the equal treatment in politics, schools, society, and the economy of the liberties of all persons as to eliminate ethnicity-based discrimination" is its stated objective for the twenty-first century. Political lobbying, public relations campaigns, and legal team-developed lawsuit strategies are just a few of the national NAACP initiatives. To end segregation was a major goal of the National Association for the Advancement of Colored People when it was formed in 1909.
Therefore, the correct option is option B.
To know more about NAACP, here:
https://brainly.com/question/30517849
#SPJ7
Radioactive decay follows first-order kinetics. If a sample of I-131 decays from 25.0 mg to 8.25 mg in 12.8 days, what is the rate constant, k?
Answer:
k = 0.0866 days⁻¹
Explanation:
The isotope decay of the atom follows the equation:
ln [A] = -kt + Ln[A]₀
Where [A] is the amount of the isotope after time t = 8.25mg
Time = 12.8days
k is rate constant
[A]₀ is actual amount of the isotope = 25.0mg
Replacing:
ln 8.25mg = -k*12.8days + ln 25.0mg
2.11 - 3.22 = -k*12.8days
-1.11 = -k12.8days
k = 0.0866 days⁻¹
A hot air ballon will rise in air because:
Answer: C
Explanation:
Hot air is a lot less dense for a few reasons. Hot air essentially means the particles have more kinetic energy, and move around a lot more. Cold air is dense because the particles move a lot less, have less energy, and are closer together.
Answer:
A
Explanation:
Since the balloon itself is heavier than air, it must be filled with a large volume of something much lighter—either hot air or a very light gas, such as helium. Because the combined weight of the balloon and the gas is less than the weight of an equal volume of surrounding air, the balloon rises.
yo why do females have to be so heartless to a guy who really put they all in for her?
Answer:
ikr
Explanation:
♂️ it's really sad
Answer:
sometimes the female doesn't want to be hurt, or it could be from the last relationship she was in. maybe just maybe the female feels like you are using her for her body or just to use her. Sometimes females want to stop the heartache before it begins. Tbh we all have different reasons for it.
Explanation:
Most of Earth's major earthquakes are caused by
x
seasonal heating and cooling of Earth's surface
B
x
weathering of rock at Earth's surface
C
x
earth's gravitational attraction to the Moon
D
x
faulting of rock in earth's crust
Answer:
d
When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.
How many grams of propane, C3H8, are needed to make 140 grams of water?
Answer:
85.6 g
Explanation:
Step 1: Write the balanced combustion equation
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O
Step 2: Calculate the moles corresponding to 140 g of H₂O
The molar mass of H₂O is 18.02 g/mol.
140 g × 1 mol/18.02 g = 7.77 mol
Step 3: Calculate the moles of C₃H₈ needed to produce 7.77 moles of H₂O
The molar ratio of C₃H₈ to H₂O is 1:4. The moles of C₃H₈ needed are 1/4 × 7.77 mol = 1.94 mol.
Step 4: Calculate the mass corresponding to 1.94 moles of C₃H₈
The molar mass of C₃H₈ is 44.10 g/mol.
1.94 mol × 44.10 g/mol = 85.6 g
Weathering, erosion, and deposition by water, wind, and ice are interactions between
which two of Earth's systems?
PLEEAASSEE HELP ITS ALREADY WAY PAST DUE AND ILL GIVE BRAINLIEST
Which of the following would be the evidence of a physical change?
A. unexpected change in odor
B. change in state of matter
C. formation of bubbles
D.precipitate was formed
Answer:
A. unexpected change in odor
Explanation: Common physical changes include melting, change of size, volume, color, density, and crystal form. Example the classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.
What property of water is primary for living organisms? (SC.6.E.7.4) *
1 point
It is odorless.
It does not conduct electricity.
It is tasteless
It is liquid at most temperatures on Earth.
Answer:
It is liquid at most temperatures on Earth.
How many atoms are in 4.36 moles of copper ?
Answer:
Moles of Cr in 4.36×1023 atoms of Cr?
I mass of Cr = 52.00
A's# = 6.02x10^23
I don't know how to approach this. Help?
Update:
Moles of Cr in 4.36×10^23 atoms of Cr?
Update 2:
ALSO......
moles of Cu in 9.7×10^21 atoms of Cu?
moles of C2H6 in 2.75×10^23 molecules of C2H6?
Explanation:
4.) What is atomic number.
Answer: the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Explanation:
how does a decrease in potential energy during a chemical rwaction relate to the temperature of the surroundings
Answer: If the potential energy of the reaction system decreases, then kinetic energy in the surroundings increases and the temperature of the surroundings rises
Explanation:
The decrease in the potential energy results in an increase in the temperature of the system and surroundings.
Mechanical energy has been described as the sum of the kinetic and the potential energy in the system. With the increase in the potential energy, there has been a decrease in the kinetic energy and vice versa.
The decrease in the potential energy results in an increase in the kinetic energy of the system. The kinetic energy has been termed as the energy of performing work. The rise in the kinetic energy results in an increase in the work done in the system and there has been an increase in the temperature of the system.
Thus, the decrease in the potential energy results in an increase in the temperature of the system and surroundings.
For more information about the potential energy, refer to the link:
https://brainly.com/question/21288807
Nerve impulses are picked up by a neuron’s:
(1) dendrites
(2) axon
(3) synapse
(4) neurotransmitter
(CH3CH2)2CHCH(CH3)2 Check all that apply. Check all that apply. alkane alkene alkyne cycloalkane cycloalkene cycloalkyne aromatic hydrocarbon
Answer:
Alkane
Explanation:
Alkane is a class of organic compounds that contain only carbon and hydrogen and the carbon atoms are connected to each other by single bonds.
Now, if we look at the molecule whose condensed structural formula is shown in the question, we will notice that the compound can only contain single bonds. That is, the molecule is a saturated hydrocarbon(alkane).
I have drawn out the full structure of the compound to illustrate this point.
If 0.813 g of O3 reacts with 0.605 g of NO, how many grams of NO2 will be produced?
Answer:
0.74 g O
3
=
48
0.74
=0.0154 mol O
3
0.67 g NO=
30
0.67
=0.0223 mol NO
O
3
is the limiting reagent and NO is in excess =0.0223−0.0154=0.007 mol
Thus, O
3
taken =NO
2
formed =0.0154 mol NO
2
=0.0154×46 g NO
2
Explanation:
A reaction that releases energy in the form of heat is called a/n
Answer:
Exothermic reaction!
Explanation:
Exo -> Releases Heat
Endo -> Absorbs Heat
1 This animal has a backbone, nurses its offspring: likes to gnaw, has a bushy tail: climbs trees; has reddish fur on its
back and has white fur on its belly.
Answer: American red squirrel
Explanation:
The American red squirrel is the smallest squirrel. The color of the fur may vary from season to season. The color of the squirrel can also vary depending of the environment in which it lives. In summer the black stripe appears on the sides over the white fur. It has a backbone and like other mammals nurses the offsprings. It has a bushy tail. It is a native of North America. Red fur appear on the back and white on the belly. Strong claws, strong muscles, and compact body are other key features of the squirrel.