How is heat transferred when a person holds a pen that is already at body
temperature?
A. From the hand to the pen
B. Heat is not transferred.
C. In both directions between the pen and the hand
D. From the pen to the hand
SUBMIT
Answers
Answer:
The answer is B.
Explanation:
Heat is not transferred.
Related Questions
Conservation of matter means that:
55
Matter is never created nor destroyed.
Matter is always created and destroyed.
Matter always turns into energy
Matter is flexible, it can be created destroyed, or turned into energy
Answers
Answer:
Matter is never created or destroyed
How many grams of iron (III) oxide are needed?
Answers
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Oxide, or 159.6882 grams.
Which statement is a scientific law?
A.Scientists use genes to explain why evolution happens.
B.Genes are long patterns that are similar to computer codes.
C.A person’s traits are controlled by different forms of a gene.
D.The discovery of genes changed how scientists think about life.
Answers
Answer:
A.Scientists use genes to explain why evolution happens.
Explanation:
:)
(b) assume that the atoms are predominantly iron, with atomic mass 55.9 u. how many atoms are there in this section?
Answers
Number of atoms = (mass of section in grams / 55.9 g/mol) x (6.022 x 10^23 atoms/mol).
A general formula to calculate the number of atoms based on the given information. The formula is:
Number of atoms = (mass of section in grams / atomic mass of iron) * Avogadro's number
Using the atomic mass of iron given as 55.9 u and Avogadro's number as 6.02 x 10^23, one can calculate the number of atoms in the section given its mass in grams. To stay within the word count limit of 100 words, I cannot provide an exact calculation. Assuming the atoms in the section are predominantly iron with an atomic mass of 55.9 u, we can calculate the number of atoms. First, we need the mass of the section in grams. Convert this mass to moles using the atomic mass of iron (1 mole of iron = 55.9 g). Finally, use Avogadro's number (6.022 x 10^23 atoms/mole) to find the number of atoms.
Number of atoms = (mass of section in grams / 55.9 g/mol) x (6.022 x 10^23 atoms/mol)
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assuming both forward and reverse reactions are elementary processes, which reaction has the larger rate constant: the forward or the reverse reaction? match the words in the left column to the appropriate blanks in the sentences on the right.
Answers
If the equilibrium constant (Kc) has a value of 3.1 × 10⁻⁴ (which is much less than one), we would expect the rate constant (k) to be larger than kr.
Matching the words to the appropriate blanks:
smaller Kc: much less than one
k: larger
kr: much more than zero
Assuming both the forward and reverse reactions are elementary reactions, we can make some general observations about the relationship between the rate constants (k and kr) and the equilibrium constant (Kc).
The equilibrium constant (Kc) is related to the rate constants of the forward (k) and reverse (kr) reactions through the equation:
Kc = k/kr
Comparing the values, we can draw the following conclusions:
If Kc is much less than one (<<1), then the value of k is larger than kr. This implies that the forward reaction is faster than the reverse reaction, leading to a higher rate constant (k) compared to kr.
If Kc is much larger than one (>>1), then the value of kr is larger than k. This implies that the reverse reaction is faster than the forward reaction, resulting in a higher rate constant (kr) compared to k.
If Kc is much closer to one, there is no definitive conclusion about the relationship between the rate constants. We would need specific numerical values of Kc, k, and kr to make further determinations.
Therefore, based on the given information, if the equilibrium constant (Kc) has a value of 3.1 × 10⁻⁴ (which is much less than one), we would expect the rate constant (k) to be larger than kr.
Matching the words to the appropriate blanks:
smaller Kc: much less than one
k: larger
kr: much more than zero
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It is estimated that the total amount of oxygen (O₂) contained in BIFs is equivalent to 6.6% of the oxygen present in the modern atmosphere. This is quite impressive given that the atmosphere during Archaean and early Proterozoic times was largely devoid of oxygen! Therefore, this reflects the photosynthetic efficiency of the early biosphere, coupled with its operation over long periods of time. Knowing that the mass of the modern atmosphere is 5.01×10¹⁸ kg, of which 21% is oxygen, what is the mass (in kilograms) of oxygen contained within BIFs?
_____ ×10¹⁶ kg of O₂ contained in BIF deposits
Knowing that the molecular mass of O₂ is 32 g/ mole (0.032 kg/ mole ), how many moles of O₂ are contained within BIFs?
____ ×10¹⁸ moles of O₂ contained in BIF deposits
Now, let us think about iron (Fe). The total mass of BIF's globally is estimated at 5.0×10¹⁷ kg, wherein iron accounts for approximately 35% by mass. The atomic mass of iron is 55.8 g/mole(0.0558 kg/mole). What is the total mass of iron in BIFs in kilograms and moles?
_____ ×10¹⁷ kg of Fe contained in BIF deposits
_____ ×10¹⁸ moles of Fe contained in BIF deposits
Finally, take the values you have computed in units of moles, and express them as the molar ratio of iron (Fe) to oxygen (O₂) of BIFs. You can do this by dividing both sides of the ratio by the larger number (Fe in this case).
FeO₂=1 _____
Your calculated ratio above should fall between the Fe: O₂ molar ratios of both Hematite (1:0.75) and Magnetite (1:0.67). Which molar ratio is your calculated value closest to (meaning which iron component, Hematite or Magnetite, is the more dominate in BIFs)?
Answers
The calculated molar ratio of iron to oxygen in BIFs is 1.452.
Comparing this ratio to the molar ratios of Hematite (1:0.75) and Magnetite (1:0.67), we can see that the calculated value of 1.452 is closest to the Hematite molar ratio of 1:0.75. Therefore, Hematite is the more dominant iron component in BIFs.
To calculate the mass of oxygen contained within BIFs, we'll use the given information:
Total mass of the modern atmosphere = 5.01×10¹⁸ kg
Percentage of oxygen in the modern atmosphere = 21%
Mass of oxygen contained within the modern atmosphere = (5.01×10¹⁸ kg) × (0.21) = 1.051×10¹⁸ kg
Percentage of oxygen contained in BIFs = 6.6% (given)
Mass of oxygen contained within BIFs = (6.6% of 1.051×10¹⁸ kg) = 6.6/100 × 1.051×10¹⁸ kg = 6.9166×10¹⁶ kg
Therefore, the mass of oxygen contained within BIFs is 6.9166 × 10¹⁶ kg.
To calculate the number of moles of oxygen contained within BIFs, we'll use the molecular mass of O₂:
Molecular mass of O₂ = 0.032 kg/mole
Number of moles of oxygen contained within BIFs = (Mass of oxygen in BIFs) / (Molecular mass of O₂)
= (6.9166×10¹⁶ kg) / (0.032 kg/mole) = 2.1614375 × 10¹⁸ moles
Therefore, the number of moles of oxygen contained within BIFs is 2.1614375 × 10¹⁸ moles.
Next, let's calculate the mass of iron in BIFs:
Total mass of BIFs = 5.0×10¹⁷ kg
Percentage of iron in BIFs = 35%
Mass of iron contained within BIFs = (35% of 5.0×10¹⁷ kg) = 35/100 × 5.0×10¹⁷ kg = 1.75×10¹⁷ kg
To calculate the number of moles of iron contained within BIFs, we'll use the atomic mass of iron:
Atomic mass of iron = 0.0558 kg/mole
Number of moles of iron contained within BIFs = (Mass of iron in BIFs) / (Atomic mass of iron)
= (1.75×10¹⁷ kg) / (0.0558 kg/mole) = 3.1367419 × 10¹⁸ moles
Therefore, the number of moles of iron contained within BIFs is 3.1367419 × 10¹⁸ moles.
Finally, let's calculate the molar ratio of iron to oxygen in BIFs:
Molar ratio of iron to oxygen = (Number of moles of iron) / (Number of moles of oxygen)
= (3.1367419 × 10¹⁸ moles) / (2.1614375 × 10¹⁸ moles)
≈ 1.452
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a ligand is select one: another name for the solvent in the reaction. an exact quantity of a substance, usually measured using a pipet. an ion or small molecule that makes a stable bond to a metal cation through sharing of unpaired electrons. is found on the product side of a reaction equation.
Answers
Answer:
The third one: An ion or small molecule that makes a stable bond to a metal cation through sharing of unpaired electrons
Explanation:
"A ligand is an ion or molecule that can form a stable complex with a metal cation by sharing a pair of electrons". This is the correct option.
This process is called coordination, and the resulting complex is called a coordination complex. It can be anions, such as chloride (Cl-) or cyanide (CN-), or neutral molecules, such as ammonia (NH3) or water (H2O).
In a chemical reaction, the ligand binds to the metal cation to form a complex. The complex can then undergo various reactions, such as oxidation or reduction, or it can dissociate back into the metal cation and the ligand.
Ligands are important in many fields, including biochemistry, inorganic chemistry, and catalysis.
Ligands are not the solvent in a reaction, as the solvent is the substance in which the reaction occurs.
Also, a ligand is not an exact quantity of a substance, as the amount of ligand present can vary.
Finally, a ligand can be found on either the reactant or product side of a reaction equation, depending on the reaction being studied.
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Which of the following indicates a strong base is present?
A) pH close to 7 B) good conductor of electricity C) low reaction rate D) indicator turns green-blue
Answers
Strong bases are bases which completely dissociate in water into the cation and OH- (hydroxide ion). The hydroxides of the Group I (alkali metals) and Group II (alkaline earth) metals usually are considered to be strong bases. These are classic Arrhenius bases. Here is a list of the most common strong bases.
LiOH - lithium hydroxide
NaOH - sodium hydroxide
KOH - potassium hydroxide
RbOH - rubidium hydroxide
CsOH - cesium hydroxide
*Ca(OH)2 - calcium hydroxide
*Sr(OH)2 - strontium hydroxide
*Ba(OH)2 - barium hydroxide
A strong base has been indicated with the ability to be a good conductor of electricity. Hence, option B is correct.
What is the base?Bases are defined as compounds that have the ability to form the release of the negative ions or the hydroxide ions in the solution. The acids release hydrogen or proton, thereby bases tend to have the ability to neutralize acids.
The pH has been the measure of the solution to be able to accept or donate the protons and electrons. The pH has been measured on a scale of 1-14 with the acids having a pH of less than 7, and the pH of bases tends to move towards 14. 7 is the neutral pH.
The strong bases form the dissociation of the ions in the solution more readily, and ions contribute as the medium, thereby forming the conduction of the electricity. Hence, option B is correct.
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Which value indicate the strongest base
A. pH of 2
B. pH of 5
C. ph of 12
D. pH of 8
Answers
Explanation:
The highest number is the strongest base. Therefore the pH of 12 is the strongest base here (C).
HELP QUICKLY PLEASEEE
Answers
Answer:
Ionic bonds are when electrons are gained/lost. Hence the valence charges.
How many valence electrons does magnesium(Mg) have?
Answers
Magnesium have two valence electrons. Because the outer energy level for the magnesium atom is 3 and it has two electron in this energy level.
The Valence electrons are defined as the electrons that located in the outermost electron shell of an atom. These valence electrons being the furthest from the nucleus and thus the least tightly held by the atom are the electrons that participate in bonds and reactions. The number of valence electrons that an element has determines its reactivity, electronegativity and the number of bonds it can form. We can use the periodic table to help to determine how many valence electrons an element specifically a neutral atom of the element has. Looking at the group that the element is in as the group number indicates the number of valence electrons that the element has.
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Fill in the blank
Potential energy is energy an object has due to its ____
or condition
Answers
Answer :position
Explanation:
Potential energy is the energy stored in an object due to its position
Module 5 Exam / 5 A Science / Module 5: Sound and Light All changes saved
What affects how sound travels? (Select all that apply.)
wavelength
pressure
medium
temperature
PLEASE SELECT MORE THAN ONE IF YOU DO I WILL GIVE BRAINLY WHEN I GET THE CHANCE
Answers
Answer:
the answer is temperature
Answer:
Medium and temperature.
Explanation:
Hope this helps others who are looking for the answer of this question :)
Kelli and Jarvis are members of the stage crew for the Variety Show. Between acts, they must quickly move a Baby Grand Piano onto stage. After the curtain closes, they exert a sudden forward force of 524 N to budge the piano from rest and get it up to speed. The 158-kg piano experiences 418 N of friction. a. What is the piano's acceleration during this phase of its motion? b. If Kelli and Jarvis maintain this forward force for 1.44 seconds, then what speed will the piano have?
Answers
If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.
Kelli and Jarvis exert a force of 524 N on a 158- kg (m) piano.
The friction force, which opposes this force, is 418 N.
The net force (F) is the difference between both forces.
F = 524 N - 418 N = 106 N
We can calculate the acceleration (a) of the piano using Newton's second law of motion.
What is Newton's second law of motion?Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.
a = F/m = 106 N/158kg = 0.671 m/s²
The piano start from rest (u = 0 m/s) and moves with an acceleration of 0.671 m/s² for 1.44 s.
We can calculate its final velocity (v) using the following kinematic equation.
v = u + a × t
v = 0 m/s + 0.671 m/s² × 1.44 s = 0.966 m/s
If Kelli and Jarvis maintain a forward force of 524 N for 1.44 seconds on a 158-kg piano, the acceleration will be 0.671 m/s² and the final velocity will be 0.966 m/s.
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A solution containing which one of the following pairs of substances will be a buffer solution? A solution containing which one of the following pairs of substances will be a buffer solution? AgBr, HBr CuCl, HCl CsI, HI KI, HI none of the above
Answers
Which of the halves that of compounds will make up the buffer solution in a solution Any of the halves that of substances, when present in a solution, will make it a buffer solution None of the above.
What exactly is a buffer solution?As a result, it's essential to have liquids whose pH doesn't really alter even when strong alkalies nor strong acids are added. These are referred to as buffer solutions. The ability of a buffer to withstand a change in pH is known as buffer capacity.
What makes it a buffer solution?it can neutralize a small amount of additional acid or base, the pH of the liquid is kept comparatively steady.
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A balloon has a volume of 1.40 L at 24.0ºC. The balloon is heated to 48.0°C. Calculate the new volume of the balloon.
A 1.50 L
B 2.10 L
C 1.70 L
D 1.80 L
Answers
Answer:I am not sure how
Explanation: sorry free trial
1. 4.5 cm = __________ Km
2. 34⁰C = __________ Kelvin
3. 195kg = __________ lb
7. 108⁰F =__________ ⁰C
8. 63.2 m =__________ mm
if you can solve this for me I'd gladly appreciate it
Answers
Answer:
1. 0.000045km
2. 307.15 Kelvin
3. 429.9014lb
7. 42.22222 celcius
8. 63200 mm
Based on what you have learned about the units for measuring thermal energy, complete the following passage.
The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is the
. We can also use this unit, as we did in this lab, for measuring
. This is a property that is quantified by the energy needed per
of material to raise the temperature by one
. The unit for this measure is therefore
.
Answers
Answer:
1.joule 2.specific heat 3.gram 4.degree Celsius 5.J/g°CExplanation:
I did the lab
Thermal energy is represented in the units joules J. It is the energy needed to raise the temperature by one degree celsius.Per gram this energy is called as specific heat capacity with the unit J/°Cmol.
What is heat capacity?Heat capacity of a substance is the heat energy required to raise the temperature of the substance by one degree celsius.
If the heat capacity is measure per one mole of a substance it is called specific heat capacity. It is an intensive property whereas heat capacity is an extensive property.
The given passage can be completed as follows:
The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is Joule (J). We can also use this unit, as we did in this lab, for measuring heat capacity.
This is a property that is quantified by the energy needed per one gram of material to raise the temperature by one degree celsius.The unit for this measure is therefore J/°Cg.
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Write a hypothesis that answers the lesson
question, "While observing a chemical reaction,
how can you tell which reactant is limiting?"
Hypothesis: If a substance is the limiting
reactant, then..
Answers
Answer:
the reaction will come to a halt and the other reactant will still be present.
what term is used to describe the thick mixture of liquid and solid used to form the chromatography column?
Answers
Thick liquid layer that interacts with an inert carrier gas or mobile phase and is chemically linked to the inside of a capillary column
What is a chromatographic example?
Chromatography Methods
Some forms of liquid chromatography include high-performance liquid chromatography (HPLC), size exclusion chromatography, and supercritical fluid chromatography. Ion-exchange, resin, and paper chromatography are a few other varieties of chromatography.
What is the chromatography's fundamental tenet?
Chromatography is one more method for separating and analyzing chemical mixtures. The method is based on the interaction of polarity between the sample and two additional components, the solid (or stationary) phase, and the mobile phase, which can be either a liquid or a gas.
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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.
Answers
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
If 115grams of a substance reacts with 84grams of another substance, what will be the mass of the products after the reaction?
Answers
what is the metal that is grouped with metalloids
Answers
Answer:
The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.
Explanation: i googled it
The metal that is grouped with metalloids are
boron, silicon, germanium,arsenic, antimony, and tellurium.A metalloid is a type of element which possesses the characteristics of both the metals and the non-metals.
Metals are those elements that are good conductors of heat and electricity while non-metals are those elements that neither conducts heat nor electricity.
The characteristics of the metalloids listed above are:
They conduct heat only at higher temperatures. The metalloids that can conduct electricity are called semi-conductors.They are shiny like metals but brittle like non-metals.Therefore, since these elements share both the properties of metals and non-metals, they are called the metalloids.
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4. The students predict that the reaction will release a lot of energy. What question could help
provide support for the prediction?
Answers
Take a reaction among lime water
\(\\ \rm\rightarrowtail CaO+H_2O=Ca(OH)_2\)
If it releases heat
The question must include
+Heat sign or ∆ symbol∆H must be +veAnswer:
hope it's helpful to you
Chemical Equations
and Formulas
4
If you start with 5 grams of
carbon on the reactant side,
how many grams of carbon
should you end with?
Reactant: 5 grams of Carbon
© The Science Duo
Answers
Answer:
You will end up with 5g of carbon
Explanation:
If one starts a reaction with 5g of carbon, they will end up 5g of carbon at the end of the reaction.
Chemical reactions obey the law of conservation of mass.
Based on this law "mass is always conserved as matter is neither created nor destroyed in a chemical reaction". Therefore, whatever the reactants we start with, we end with the same amount. Though species recombine to give a different compound in the product, the mass is still always conserved.i dont know the answer pls help me
Answers
Answer:
Unicellular
Explanation:
Unicellular organisms are made up of only a single cell
What do we call the phenomena when plants bend towards the light?
Photomorphogenesis
Auxin
Phototropism
Photosynthesis
Answers
A sample of 250 g of water are heated from 40°C to 121°C, calculate the amount of heat energy absorbed.
552,000 Joules
100,416 Joules
638, 555 Joules
73,885 Joules
Answers
Answer:
the anwser isn't in the choices
Explanation:
H=MC(change of temp.)
M=mass of water=250g
C=specific heat of water = 4.186 j/g
change in temperature is 121-40= 81
H= 250x4.186x81=84766.5J
pls help i'll mark you the brainlest
What is the independent variable shown on this graphA. only volume (cm³) is the independent variable
B. both volume (cm³) and mass (grams) are independent variable
C. not enough information
D. the slope of the trend line
E. only mass (grams) is the independent variable
Answers
Answer: The answer is A. Volume is the independent variable.
Which way would CCI2F2 orient in an electric field?
Answers
Answer:
See explanation
Explanation:
In looking at molecules to determine whether they are polar or not we have to look at two things basically;
i) presence of polar bonds
ii) geometry of the molecule
Now, we know that CCI2F2 is a tetrahedral molecule, but the molecule is not symmetrical. It has four polar bonds that are not all the same hence the molecule is polar.
In an electric field, polar molecules orient themselves in such a way that the positive ends of the molecule are being attracted to the negative plate while the negative ends of the molecules are attracted to the positive plate.
So the positive ends of CCI2F2 are oriented towards the negative plate of the field while the negative ends of CCI2F2 are oriented towards the positive ends of the field.