When making toast in toast oven, the following energy transformation occur
a) electric energy is converted to heat energy which heat up the filaments of toaster, which helps in roasting of toast.
b)the heat energy is transferred to bread or toast
When making toast in a toaster oven, energy transformations occur from electrical energy to thermal energy, and from thermal energy to radiant energy.
Explanation:When making toast in a toaster oven, two examples of energy transformation that occur are:
Electrical energy to thermal energy: The electrical energy from the power source is transformed into thermal energy when the toaster oven heats up the heating elements inside.Thermal energy to radiant energy: The thermal energy produced by the heating elements is transformed into radiant energy in the form of infrared radiation, which then heats up the bread slices and transforms them into toast.Learn more about Energy transformations in a toaster oven here:https://brainly.com/question/11751233
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What is the volume(in liters at stp) of 2.50 mil of carbon monoxide
The volume of one mole of substance is 22.4 L
To find the volume of 2.50 moles of carbon monoxide at STP, you multiply the moles by the molar volume at STP (22.4 L/mol), which gives you 56.0 liters.
To calculate the volume of carbon monoxide (CO) at standard temperature and pressure (STP), we should use Avogadro's Law. At STP, one mole of any gas occupies 22.4 liters. Given the amount of carbon monoxide in moles, we can determine the volume it would occupy at STP.
To find the volume:
Volume at STP (V) = Number of moles (n) x Molar volume at STP (Vm)
We know that:
[tex]n = 2.50\ moles\\ V_m = 22.4\ L/mol\ (volume\ occupied\ by\ one\ mole\ of\ gas\ at\ STP)[/tex]
So:
[tex]V = 2.50\ moles \times 22.4\ L/mol\\ V = 56.0\ liters[/tex]
This is the volume of 2.50 moles of carbon monoxide gas at standard temperature and pressure.
iron plus lead (||)sulfate react forming iron (||) sulfate plus lead
Final answer:
Fe(s) + PbSO4(s) = FeSO4(aq) + Pb(s)
Explanation:
The question involves a reaction where iron reacts with lead (II) sulfate, resulting in the formation of iron (II) sulfate and lead. This type of reaction is a single displacement reaction where a more reactive metal (iron) displaces a less reactive metal (lead) from its compound. To balance the reaction, we would write it as:
Fe(s) + PbSO4(s) = FeSO4(aq) + Pb(s)
Here, solid iron reacts with solid lead (II) sulfate to produce aqueous iron (II) sulfate and solid lead. This reaction is guided by the activity series, which predicts whether certain chemical reactions will occur based on the reactivity of the metals involved. In this case, since iron is more reactive than lead, it can displace lead from its sulfate compound.
Hey can you please help me with this I really need y’all
What is the second step in the classification of living things?
A.) Assigning them to any of the 6 domains
B.) Assigning them to any of the 3 domains
C.) Assigning them to any of the 6 kingdoms
D.) Assigning them to any of the 3 kingdoms
Answer:
B.) Assigning them to any of the 3 domains
Explanation:
The second step in the classification of living beings is to assign them to any of the three domains. There are not six domains. Furthermore, there are neither six nor three kingdoms, there are 5 kingdoms.
The three domains are:
→ Bacteria Domain: It groups most of the unicellular prokaryotes, such as bacteria and cyanobacteria.
→ Domain Archaea: It groups prokaryotes with different biochemical characteristics and that usually inhabit regions with extreme conditions.
→ Eukaria domain: It groups all unicellular and multicellular eukaryotic organisms, such as fungi, animals, plants and organisms previously classified as protists.
Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
B) mol
C) m
D) M
Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
A) kg is your answer
"Mass" is weight without gravity, and so the SI unit would also use the weight measurement. (You solve by dividing the force of gravity from the total weight to get mass.)
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24 g of magnesium were burned in oxygen. The compound formed had a mass of 40 g. Explain why the mass had gone up.
Answer :
According to the law of conservation of mass, the mass of reactants must be equal to the mass of products.
The balanced chemical reaction is,
[tex]Mg+\frac{1}{2}O_2\rightarrow MgO[/tex]
As we know that the molar mass of magnesium is 24 g/mole, the molar mass of [tex]O_2[/tex] is 32 g/mole and the molar mass of magnesium oxide is 40 g/mole.
From the given balanced reaction, we conclude that
As, 1 mole of magnesium react [tex]\frac{1}{2}[/tex] mole of oxygen to give 1 mole of magnesium oxide.
So, the mass of Mg is 24 g, the mass of [tex]O_2=\frac{1}{2}\times 32=16g[/tex] and the mass of MgO is 40 g.
That means 24 g of Mg react with 16 g [tex]O_2[/tex] to give 40 g of MgO.
The mass increased when magnesium burnt in oxygen because magnesium combines with oxygen to form magnesium oxide. This compound is heavier than the original magnesium because it includes the mass of both magnesium and oxygen.
Explanation:The mass increased when 24 g of magnesium was burnt in oxygen because magnesium combines with oxygen in the air to form a compound. This is fundamentally due to magnesium's affinity for oxygen. The resulting compound, magnesium oxide (MgO), has a higher mass because it combines the masses of both magnesium and oxygen. The reaction can be written as: 2Mg(s) + O2(g) → 2MgO(s). Here, oxygen from the air adds additional mass, resulting in a final product that is heavier than the original magnesium.
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Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?
Answer : The correct option is, Malleable, shiny, and able to conduct heat or electricity.
Explanation:
Metals : Metals are the elements which can easily loose electrons and forms cations.
Properties of metals :
They are lustrous (shine).They are malleable and ductile (flexible).They conduct heat and electricity.The metallic oxides are basic in nature. They form cations in an aqueous solution.Non-metals : Non-metals are the elements which can easily gain electrons and form an anion.
Properties of non-metals :
They are non-lustrous.They are brittle and hard in nature.They do not conduct heat and electricity.The non-metallic oxides are acidic in nature. They form anions in an aqueous solution.Hence, from the given options the correct option for metal is, Malleable, shiny, and able to conduct heat or electricity.
Answer:
Malleable, shiny, and able to conduct heat or electricity
Hope this helps! :D
Explanation:
in sexual reproduction, of each chromosome in a pair has the same genes, how is genetic variety possible?
This answer will depend on if you are speaking about asexual reproduction or not.
Variety is possible here because the the product genes are half from the mother and half from the father. So a child might have blue eyes from his mother, but red hair from his father, etc. Different genetic mutations are the initial cause of all differentiation between genes, which are passed down from each generation to the next through this same process.
In Asexual reproduction, all reproductions are essentially clones of the parent, and no genetic variation, other than mutations will occur.
Punnet Squares, they are charts to determine genetic variation by genotype and phenotype :)
What is true of a decomposition reaction? The reactants are usually a metal and a nonmetal. The reactants are generally two ionic compounds in an aqueous solution. The addition of energy in the form of heat or electricity is often required. Water is usually one of the reactants.
Answer
In a true decomposition reaction, the addition of energy in the form of heat or electricity is often required.
Explanation
A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat or electricity to facilitate the breaking-down of the chemical bonds.
Answer:
The addition of energy in the form of heat or electricity is often required.
Water vapor is condensed steam.
True
False
The statement is false. Water vapor is the gaseous state of water, while condensed steam is liquid water. Water vapor can become 'condensed', or turned into liquid, through a process called condensation.
Explanation:The statement 'Water vapor is condensed steam' is False.
Water vapor is the gaseous state of water, which is commonly formed from the evaporation or boiling of liquid water or from the sublimation of ice. Condensed steam, on the other hand, refers to steam, or water vapor, that has been cooled down to return to its liquid state - this process is known as condensation.Therefore, condensed steam would be liquid water, not water vapor.
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List the 3 ways carbon can enter the ocean?
Final answer:
Three ways carbon can enter the ocean are through running water, atmospheric dissolution, and decomposition of aquatic organisms.
Explanation:
Carbon can enter the ocean through three main ways:
Running water: Carbon is slowly dissolved in rocks by running water and eventually ends up in the ocean.Atmospheric dissolution: The top layer of ocean water dissolves some carbon dioxide out of the atmosphere.Decomposition of aquatic organisms: Carbon enters ocean water from the decomposition of aquatic organisms.explain why subscripts cannot change when balancing a chemical equation
not be changed to balance an equationSubscripts are part of the chemical formula for reactants or products and can
Changing a subscript changes the substance represented by the formula
Subscripts are the identity of the element (the number of atoms) whereas coefficients are the number of molecules of the element.
If you change the subscript, you change the number of atoms an element has. This changes the entire element since each element in the periodic table have different atomic numbers.
BRAINLIEST HELP PLEASE!!!!
1) The table below shows the volume of two samples, X and Y, when placed in three containers of different volumes.
Volume of Samples
Volume of Container Volume of Sample X Volume of Sample Y
200 mL 200 mL 200 mL
500 mL 200 mL 500 mL
600 mL 200 mL 600 mL
Which of the following correctly describes the state of matter of one of the samples?
Y is a gas because it has a definite volume.
X is a liquid because it has a definite volume.
Y is a liquid because it fills up the entire container.
X is a gas because it fills up the entire container.
2) The table below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass
(g)
Yellow 3 135
Black 2 48
Which cube is denser?
Black, because it has less volume and less mass.
Yellow, because it has more volume and more mass.
Black, because the product of its side and mass is lower.
Yellow, because the product of its side and mass is higher.
Answer:
1)B X is a liquid because it has a definite volume.
2)D White, because it has less volume, but a lot more matter.
Do not pick black it it wrong
take a look
(1) In the given samples of X and Y, the definite volume has been observed for sample X. Thus, X has been a liquid. Hence, option B is correct.
(2) The yellow box has been denser, as the product of mas and side has been higher. Thus, option D is correct.
The volume of the substance has been defined as the space occupied by the matter. The mass of substance has been the product of density and volume.
Volume and Density of matter(1) The state of matter has been based on the intermolecular attractions. The solid state has definite shape and volume.
Liquid has definite volume, but no defined shape. While gases have no definite volume and shape.
In the given samples of X and Y, the definite volume has been observed for sample X. Thus, X has been a liquid. Hence, option B is correct.
(2) The density has been defined as mass per unit volume.
The volume of cube has been given as:
[tex]\rm Volume=a^3[/tex]
Where, a has been the side of the cube
The density has been expressed as:
[tex]\rm Density=\dfrac{Mass}{Volume}[/tex]
Thus, the object with lower volume and more mass has been denser than the other.
The yellow cube has mass 135 g, and volume 27 cubic centimeters
The black cube has mass 48 g, and volume 8 cubic centimeters.
The yellow box has been denser, as the product of mas and side has been higher. Thus, option D is correct.
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A substance which produces hydroxide ions when placed in water is a(n) _____.
A:dehydrate
B:base
C:solvent
99 points to whoever best answer.
The answer you're looking for is B:base
The base is disestablished in the water, and the molecules form into ions and produces OH- ions.
Like your profile picture
Hope this helped:D
Question: A substance which produces hydroxide ions when placed in water is a _____.
Answer: base
Explanation: a substance that contains hydrogen causes to produce hydrogen ions
question answered by
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What are the differences between thermoplastics and thermosetting plastics? Give examples and draw a simple diagram to show what kind of linkages are there in the polymer chains.
on the basis of the reaction of heat in plastic , their are two types of plastics :
Thermoplastic & Thermosetting plasticsThermoplastics : Plastics which easily get deformed (become soft )on heating and also get bend easily are known as thermoplastics .
examples : polythene , polyvinyl chloride and polystyrene .
thermosetting plastics : plastics which once moulded into a shape do not become soft on heating and cannot be moulded again are called thermosetting plastics .
examples : bakelite , melamine and formica
how many individual atoms make up one unit of aluminum chloride, ALCL3?
4 atoms make up aluminium chloride: 1 aluminum atom and 3 chlorine atoms
Write a balanced equation for double replacement of KOH+ZnCl2
Answer :
Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as a product.
[tex]AB+CD\rightarrow AD+CB[/tex]
In this, A and C are the cations and B and D are the anions.
When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.
The balanced chemical reaction is,
[tex]KOH+ZnCl_2\rightarrow Zn(OH)_2+2KCl[/tex]
What salt is formed by the reaction of potassium hydroxide and hydrochloric acid?
Potassium hydroxide (KOH) is formed when Potassium forms ionic bonds with OH-ions while Potassium Oxide (K2O) is formed when potassium forms ionic bonds with the Oxide (O2-) ions. i.e. This reaction is a neutralization reaction and occurs when an acid (HCl) reacts with a base (KOH).
Answer: potassium chloride
Explanation:
Double displacement reaction is one which involves exchange of ions. Neutralization is a type of double displacement reaction in which an acid combines with a base to form salt and water, the reaction is called as neutralization reaction.
[tex]KOH+HCl\rightarrow KCl+H_2O[/tex]
Thus the salt formed is potassium chloride which has the chemical formula [tex]KCl[/tex].
between sour soup,melting of candle wax,rusting, and burning which is not a chemical reaction
Sour soup is not a chemical reaction
A metal has higher reactivity than mag esoum where would the metal be on a periodic table
Answer is: below magnesium in group 2 or in group 1 (left from magnesium).
Reactivity series is an empirical progression of a series of metals, arranged by their reactivity from highest to lowest (alkaline metals have highest reactivity and Noble metals lowest reactivity).
This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.
Sodium and potassium (group 1 - alkaline metal) are more reactive than magnesium.
Strontium and barium (group 2 in periodic table) are higher in this group from magnesium. Strontium is stronger reducing agent than magnesium, gives electrons easier.
is P2I4 or Diphosphorus tetraiodide covalent or ionic?
Diphosphorus tetraiodide is a covalent compound.
It has low melting point as compared to ionic compounds
It is a rare compound where the oxidation state of Phosphorous is +2.
It is also termed as subhalide of phosphorous.
Answer: covalent bond.
Explanation:
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.
As [tex]P_2I_4[/tex] or Diphosphorus tetraiodide is made up of phosphorous and iodine which are both non metals , it is a covalent bond.
AgI + Na2S Ag2S +NaI=
The equation needs to be balanced and written as,
[tex]2AgI+1 Na_{2} S[/tex]→[tex]1Ag_{2} S+2NaI[/tex]
Both side of compound should contain equal masses.
For the following reaction if you have 13.2g of CO and 42.7g of Fe2O3, which is the limiting reagent with regards to the Fe production? Fe2O3(s) + 3CO (g) —> 2Fe(s) + 3 CO2 (g)
Answer: CO is a limiting reagent with regards to the Fe production.
Explanation:
[tex]Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)[/tex]
Moles of CO = [tex]\frac{\text{mass of CO}}{\text{molar mass of CO}}=\frac{13.2 g}{28 g/mol}=0.4714 mol[/tex]
moles of [tex]Fe_2O_3=\frac{\text{mass of} Fe_2O_3}{\text{molar mass of}Fe_2O_3}=\frac{42.7 g g}{159.7 g/mol}=0.2673 mol[/tex]
According to reaction , 3 mole of CO reacts with 1 mole of [tex]Fe_2O_3[/tex] then , 0.4714 moles of CO will react with : [tex]\frac{1}{3}\times 0.4714 [/tex] moles of [tex]Fe_2O_3[/tex] that is 0.1571 moles.
0.4714 moles of CO will react with 0.1571 moles of [tex]Fe_2O_3[/tex] which means that CO is present in limited amount acting as limiting reagent.
Mole remaining of [tex]Fe_2O_3[/tex] = 0.2673 mol - 0.1571 mol = 0.1102 mol
Hence, CO is a limiting reagent and [tex]Fe_2O_3[/tex] is an excessive reagent.
If an automobile travels at 30. m/s for 2 minutes, how far has the car traveled?
3600 miles! to get this answer you first need to know that
60+60= 120
then just times tht by 30 and you get 3600!
Final answer:
The car traveling at a constant speed of 30.0 m/s for 2 minutes covers a distance of 3600 meters.
Explanation:
To calculate the distance traveled by a car that moves at a constant speed, we can use the formula distance = speed × time. Given that the car travels at a constant speed of 30.0 m/s for 2 minutes, we first need to convert the time from minutes to seconds since the speed is given in meters per second.
There are 60 seconds in a minute, so 2 minutes equals 2 × 60 = 120 seconds.
Now, we can calculate the distance:
Distance = Speed × Time
Distance = 30.0 m/s × 120 s
Distance = 3600 meters
Therefore, the car has traveled a distance of 3600 meters.
In the formula for water (H2O), what does the subscript 2 indicate?
the answer is actually "Two hydrogen atoms in the compound" >.>
Determine the heat given off to the surroundings when 9.873 g of aluminum reacts according to the equation 2Al + Fe2O3 → Al2O3 + 2Fe, ΔH°rxn= -849.1 kJ/mol.
Answer : The heat given off to the surroundings will be, -155.38 KJ
Solution : Given,
[tex]\Delta H^o_{rxn}=-849.1KJ/mole[/tex]
Mass of aluminium = 9.873 g
Molar mass of aluminium = 27 g/mole
First we have to calculate the moles of aluminium.
[tex]\text{ Moles of Al}=\frac{\text{ Mass of Al}}{\text{ Molar mass of Al}}=\frac{9.873g}{27g/mole}=0.366moles[/tex]
The given balanced reaction is,
[tex]2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe[/tex]
From the reaction, we conclude that
2 moles of aluminum releases heat energy = -849.1 KJ
0.366 moles of aluminium releases heat energy = [tex]\frac{-849.1KJ}{2moles}\times 0.366moles=-155.38KJ[/tex]
Therefore, the heat given off to the surroundings will be, -155.38 KJ
For a 0.50 molal solution of sucrose in water, calculate the freezing point and the boiling point of the solution.
Answer:
-0.93 °C; 100.26 °C
Step-by-step explanation:
(a) Freezing point depression
The formula for the freezing point depression ΔT_f is
ΔT_f = iKf·b
i is the van’t Hoff factor: the number of moles of particles you get from a solute.
For sucrose,
Sucrose (s) ⟶ sucrose (aq)
1 mole sucrose ⟶ 1 mol particles i = 1
ΔT_f = 1 × 1.86 × 0.50
ΔT_f = 0.93 °C
T_f = T_f° - ΔT_f
T_f = 0.00 – 0.93
T_f = -0.93 °C
(b) Boiling point elevation
The formula for the boiling point elevation ΔTb is
ΔTb = iKb·b
ΔTb = 1 × 0.512 × 0.50
ΔTb = 0.256 °C
Tb = Tb° + ΔTb
Tb = 100.00 + 0.256
Tb = 100.26 °C
Answer:
Explanation:
1. If the Kf = 1.86 ºC / m for water, what is the freezing point depression for the sucrose solution?
ΔT = iKf m
i=1 for sucrose
Kf = 1.86 ºC / m
m = 0.50
ΔTf = 1.86 x 0.50 = 0.93 ºC
2. If the Kb = 0.512 ºC / m for water, what is the boiling point elevation for the sucrose solution?
ΔT = i Kb m
i=1 for sucrose
Kf = 0.512 ºC / m
m = 0.50
ΔTf = 0.512 x 0.50 = 0.26 ºC
What are the atomic number and mass number of this atom
which kind of covalent bond has unequal sharing of electrons
A polar covalent bond apex!
The type of covalent bond with unequal sharing of electrons is a polar covalent bond. This occurs when one atom in the bond has a stronger attraction for electrons, creating region of slight positive and negative charges.
Explanation:The type of covalent bond that has unequal sharing of electrons is referred to as a polar covalent bond. Covalent bonds occur when two nonmetals share electrons in order to achieve a full outer energy level. However, sometimes these electrons are not shared equally because one of the atoms has a stronger attraction for electrons - we call this atom more electronegative. The most electronegative atom pulls the electrons closer to itself, causing a slight negative charge in its area and a slight positive charge in the other area, hence it is called a polar covalent bond.
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A gas occupies volume of 30 milileters at 273 K if the temperature is increased to 364 k while the pressure remains constant what will be the volume of the gas
Answer:
40 mL
Step-by-step explanation:
The pressure is constant.
The only variables are volume and temperature, so we can use Charles’ Law.
V₁/T₁ = V₂/T₂ Multiply each side by T₂
V₂ = V₁ × T₂/T₁
V₁ = 30 mL; T₁ = 273 K
V₂ = ?; T₂ = 364 K
V₂ = 30 × 364/273
V₂ = 40 mL