Answer: Using a dry tea towel to grab a hot pan puts the heat into the towel fibers, which are poor conductors of heat, and which serve to separate your hand from the hot pan by a set of air gaps.
A dry towel is a better insulator than a wet towel. Because the water in the wet towel fills the empty spaces between the fibers of the towel and helps to conduct heat. Therefore, it is much safer to pick up hot dishes with a dry cloth than a wet one.
What is thermal conduction?Conduction can be described as the process by which heat is transferred from the hotter to the colder end of an object. The capability of the object to conduct heat is its thermal conductivity.
Heat flows along a temperature gradient. Heat is conducted from the hot plate of a stove to the bottom of a saucepan in contact with it, which is an example of thermal conduction.
In solids, conduction is the combination of vibrations and collisions of molecules, propagation and collisions, and diffusion of free electrons. In gases and liquids, conduction is due to the diffusion and collisions of molecules while their random motion. Therefore, thermal conduction will be faster in a wet towel than in a dry towel.
Learn more about thermal conduction, here:
https://brainly.com/question/10542041
#SPJ2
let's consider the effectiveness of two antacids to illustrate how chemical calculations can be important in daily life. Baking soda NaHCO3, is often used as an antacid. It neutralizes excess hydrochloric acid sereted by stomach. The balanced equation for the reaction is NaHCO3(s)+HCl(aq)=H20(l)+CO2(g). Milk of magnesia, which is an aqueous suspension of magnesium hydroxide, Mg(OH)2(s)+2HCl(aq)=2H20(l)+MgCl2(aq), Which anatacid can consume the most stomach acid, 1.00g of NaHCO3,or 1.00g of Mg (OH)2?
Answer:
Milk of Magnesia would consume the most stomach acid at almost 3 times the amount as baking soda.
Explanation:
Baking Soda = NaHCO3(s)+HCl(aq)=H20(l)+CO2(g)
NaHCO3 Molar mass of 84.007 g/mol
0.012 Moles of NaHCO3 and since an equal ratio of HCl is required
we therefore neutralize 0.012 Moles of HCl
Milk of magnesia = Mg(OH)2(s)+2HCl(aq)=2H20(l)+MgCl2(aq)
Mg(OH)2(s) Molar mass: 58.3197 g/mol
0.017 Moles of Mg(OH)2 and the ratio is 2:1, so 2 moles for each 1 mole of Mg(OH)2, so we need 0.034 Moles of HCl
explain why an indicator is used in titration
Answer:
Titrations. Because a noticeable pH change occurs near the equivalence point of acid-base titrations, an indicator can be used to signal the end of a titration. When selecting an indicator for acid-base titrations, choose an indicator whose pH range falls within the pH change of the reaction.
Hope it helped!!
Which of the following statements are true? Significant figures in a measurement are all measured digits, and one estimated digit None of the above Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements
Answer: Significant figures in a measurement are all measured digits, and one estimated digit
Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements.
Explanation:
Significant figures : The figures in a number which express the value or the magnitude of a quantity to a specific degree of accuracy or precision is known as significant digits.
The significant figures of a measured quantity are defined as all the digits known with certainty and the first uncertain or estimated digit.
Rules for significant figures:
1. Digits from 1 to 9 are always significant and have infinite number of significant figures.
2. All non-zero numbers are always significant.
3. All zero’s between integers are always significant.
4. All zero’s preceding the first integers are never significant.
5. All zero’s after the decimal point are always significant.
The true statements are
Significant figures in measurement are all measured digits, and one estimated digit
Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements.
The following information should be considered:
The figures in a number that express the value or the magnitude of a quantity is known as significant digits.The significant figures of a measured quantity refers to all the digits known with certainty.Learn more: https://brainly.com/question/1979431?referrer=searchResults
The density was of a solution of sulfuric acid is 1.285g/cm3 and it is 38.08% (by weight) acid. How many millimeters of the acid solution do you need to supply 125 grams of sulfuric acid?
Answer:
255.5cm³
Explanation:
A solution that is 38.08 % by weight has 38.08g of sulfuric acid per 100g of total solution. Thus, mass of solution you need to obtain 125g is:
125g H₂SO₄ × (100g solution / 38.08g H₂SO₄) = 328.3g of solution
As density of the solution is 1.285g / cm³, the volume of 328.3g is:
328.3g × (1cm³ / 1.285g) = 255.5cm³
Why would cooking equipment be responsible for more total fires but smoking smoking responsible for more fire deaths?
Answer:
For the last few decades fires started by any type of smoking material has been the number one leading cause for household fire fatalities. It could just be that people luckily escape in time with cooking equipment fires, and smoking related fires just result in more deaths.
Calculate the Molarity of a 0.23 mole solution of sucrose, C 12 H 22 O 11 that is dissolved in 5 liters of water.
Answer:
0.046 M
Explanation:
Molarity = mol solute/ L solution = 0.23 mol/ 5 L = 0.046 mol/L = 0.046 M
What is one way to make stored water safe?
Even though you asked for ONE WAY, I found some other good ways.
1. Thoroughly wash plastic soda bottles or milk jugs with warm, soapy water.
2. Store sealed containers in a dark, dry, and cool place.
3. If after six months you have not used the stored water, empty it from the containers and repeat steps 1 through 3 above.
In the following reaction, which are the products?
Mg + 2HCl —> H2 + MgCl2
If you could, please explain as well.
Answer: H2 + MgCl2
Explanation: As they are on the right side of the equation/ are the products being made as a result of the reaction, they are the products.
What is the chemical name of the covalent compound P4O9? A. tetraphosphorus nonaoxygen B. tetraphosphate nonoxygen C. tetraphosphide nonaoxide D. tetraphosphorus nonoxides.
Answer: The chemical name of the covalent compound [tex]P_4O_9[/tex] is, tetraphosphorous nonaoxide.
Explanation:
A covalent compound is a compound where the sharing of electrons takes place between elements where both the elements are non-metals.
The naming of covalent compound is given by:
1. The less electronegative element is written first.
2. The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.
3. If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.
Hence, the correct name for the compound [tex]P_4O_9[/tex] which is a covalent compound is, tetraphosphorous nonaoxide.
1. Look at yourself in the front of the spoon (the side where the food sits). What do you see?
The you see the image
Answer:
If you look at yourself in the front of the spoon, you see that the mirror forms an inverted real image.
Explanation:
The word 'concave' means to bend inwards.
A curved mirror is a mirror that has a curved reflecting surface.
The front side of the spoon is just like a concave mirror. If you look at yourself in the front of the spoon, you see that the mirror forms an inverted real image.
Concave mirrors produce real inverted image of an object only if it is placed further away from the mirror than the focal point.
Answer:
It shows me upside down like a ghost. OoooOooh
Explanation:
Boo
I NEED HELP PLEASE, THANKS SO MUCH! :)
Solids, liquids and gases are the three most commonly accepted phases of matter. Explain the properties of each phase, including their relative energy.
Answer:
Here's what I get
Explanation:
The molecules of a substance attract each other.
They are also in constant motion.
Their kinetic energy increases with the temperature.
1. Solids
If the temperature is low enough, the molecules will have little kinetic energy.
They will not be able to escape the attractions of their neighbours, so they will be fixed in place in a crystalline array.
All they can do is vibrate about their position in the array.
The substance will be a solid.
2. Liquids
If the temperature is higher, the molecules will have enough kinetic energy to slide past each other, but not enough to escape the attractions of nearby molecules.
The substance will be a liquid.
3. Gases
If the temperature is high enough, the molecules will have enough kinetic energy to escape from the surface and fly off into space.
The molecules will on average so far apart that they won't feel the attractions of others.
When they do collide, they will have energy to bounce off each other rather than stick together.
The substance will be a gas.
What is the definition of a scientific theory
A) A method of learning that emphasizes reason as the way to understand the world.
B) A brief statement that summarizes past observations and predicts future ones.
C) A model that explains the underlying reasons for observations and laws.
D) The equivalent of a scientific opinion which others may disagree with.
E) None of these.
Answer:
The correct answer to the following question will be Option C.
Explanation:
The theory seems to be the context within which findings are explained as well as possible predictions are made. This theoretical perspective discusses the factors behind the results as well as the laws.Theories have been used in scientific knowledge to give wide interpretations to accommodate observed facts in case the root reason is still yet to be found as well as characterized.So that Option C will be the right answer.
20 points!! Please help me! Will mark Brainliest!! complete the following word equations:) also write the balanced equation, full ionic equation, and net ionic equation. Also include the states:)
a) zinc nitrate + calcium sulphide—>
b) potassium + calcium chloride—>
A 14.00-g piece of iron absorbs 1000 joules of heat energy, and its temperature changes from 25°C to 125°C. Calculate the specific heat capacity of iron.
Answer:
THE SPECIFIC HEAT OF IRON IS 0.714 J/g °C
Explanation:
Heat absorbed = 1000 J
Mass of the piece of iron = 14 g
Temeperature changes = ( 125-25)°C= 100°C
specific heat of iron = unknown
To find the specific heat of iron in the question use the formula of heat
Heat = mass * specific heat * temperature change
Specific heat = Heat / mass * temperature change
Specific heat = 1000 / 14 * 100
Specific heat = 1000 / 1400
Specific heat = 0.714 J/g °C
So therefore, the specific heat of iron is 0.714 J/g °C
PLEASE HELP CHEM BABES I HAVE BEEN CRYING FOR A WHILE NOW
1. Calculate the mass of nitrogen dioxide (NO2) present in a 0.831 L container if the pressure is 100 kPa at a temperature of 27 oC. R = 8.31 kPa x L / mol x K. (K = oC + 273).
2. A 33.2 L tank contains 280 g of compressed helium. If the pressure inside the tank is 700.0 kPa, what is the temperature of the compressed gas? You must convert the mass of helium into moles using the molar mass of He. The conversion factor will be 1 mol / molar mass of helium. R = 8.31 kPa x L / mol x K
Answer: See below
Explanation:
1. To calculate the mass, you know you can convert by using molar mass. Since mass is in grams, we can use molar mass to convert moles to grams. This calls for the Ideal Gas Law.
Ideal Gas Law: PV=nRT
We manipulate the equation so that we are solving for moles, then convert moles to grams.
n=PV/RT
P= 100 kPa
V= 0.831 L
R= 8.31 kPa*L/mol*K
T= 27°C+273= 300 K
Now that we have our values listed, we can plug in to find moles.
[tex]n=\frac{(100kPa)(0.831L)}{(8.31kPa*l/molK)(300K)}[/tex]
[tex]n=0.033mol[/tex]
We use the molar mass of NO₂ to find grams.
[tex]0.033mol*\frac{46.005g}{1mol }=1.52 g[/tex]
The mass is 1.52 g.
2. To calculate the temperature, we need to use the Ideal Gas Law.
Ideal Gas Law: PV=nRT
We can manipulate the equation so that we are solving for temperature.
T=PV/nR
P= 700.0 kPa
V= 33.2 L
R= 8.31 kPa*L/mol*K
n= 70 mol
Now that we have our values, we can plug in and solve for temperature.
[tex]T=\frac{(700kPa)(33.2L)}{(70mol)(8.31 kPa*L/molK)}[/tex]
[tex]T=40K[/tex]
The temperature is 40 K.
Difference between rapid combustion and spontaneous combustion.
Answer: The difference between rapid combustion and spontaneous combustion...
Explanation:
Rapid combustion is a form of combustion, otherwise known as a fire, in which large amounts of heat and light energy are released, which often results in a flame.Whereas spontaneous combustion is the ignition of organic matter (e.g. hay or coal) without apparent cause, typically through heat generated internally by rapid oxidation.
the vessel in which electrolysis takes place is called
PLEASE GUYS ANSWER IT
the wavelength of a light wave whose frequency 5.0x 10^9 s^-1 is
Answer:
wavelength = 6 cm .
Explanation:
frequency given = 5 x 10⁹ .
wavelength = velocity of light / frequency
= 3 x 10⁸ / 5 x 10⁹
= .06 m
= 6 cm
The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below.
Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?
A. 35Cl1-
B. 35Cl2-
C. 35Cl1+
D. 35Cl
Answer:
A. 35Cl1-
Explanation:
Chlorine needs 1 more electron to have full octet thus will take 1 electron and possess a -1 charge.
please answer in details. what class of carbon is coal
In an ecosystem, why can only one species fill an ecological niche?
Answer:
Explanation:es porque las especies con nichos idénticos tienen las mismas necesidades, lo que significa que competirían exactamente por los mismos recursos.
Why are prefixes often added to SI units?
Answer: SI prefixes are used to form decimal multiples and submultiples of SI units. They should be used to avoid very large or very small numeric values.
Explanation: ^^^
Which phrase describes a feature of a Mercator projection? is least commonly used sizes most features to scale presents longitude lines as parallel shows most accurately near the prime meridian
QUICK
Answer:
presents longitude lines as parallel
Explanation:
The Mercator projection shows longitude lines as parallel, hence greatly distorts sizes and distances near the poles. A useful feature is that a course of constant bearing shows as a straight line.
Answer:
C.) presents longitude lines as parallel
Explanation:
Took it on E2020
which of these methods could are used to separate an insoluble solid and soluble solid
Answer:
To separate an insoluble solid from a soluble solid: Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid.
Explanation:
Element X is a solid that is brittle, lacks luster,and has six valence electrons. In which group on the Periodic Table would element X be found
Answer:
Sulfur?
Explanation:
Sulfur has 6 valence electrons and does not have luster.
What would the molecular formula be if lithium and sulfur reacted to form a neutral compound?
Answer:
Li2SExplanation:
Since Lithium gives away one electron, I believe it goes to Sulfur.
Hope this helps! :)
Answer:
Li*2S
Explanation:
ed tell chem
Can someone please help me with this question
Answer:
the second one I think...
Answer:
The answer is the first one.
Acceleration is the change of velocity
Velocity is another term for speed with direction.
Which of the following is true for a gas under conditions of very low temperature? PV ÷ nRT = 1, because all gases behave ideally at very low temperatures. PV ÷ nRT = 1, because the actual volume of the gas molecules becomes considerable. PV ÷ nRT > 1, because the low temperatures speed up the particles. PV ÷ nRT < 1, because particles are unable to overcome intermolecular attractions.
What shape would a molecule with two bound groups and two lone pairs
have?
A. Trigonal pyramidal
B. Tetrahedral
C. Linear
D. Bent
Answer:
It would have to be D, a bent shape
Explanation:
I just took the quiz
50 points - I need this really soon! plz help
The pictured compound has which bond?
A.) C = C and C −C
B.) C = C and C −H
C.) C −Cand C −H
D.) C −C, C −H, and C −O
Answer:
C.
Explanation:
Butane (C4H10) has 3 C-C bonds in the carbon chain and 10 C-H bonds
Butane ([tex]C_4H_10[/tex]) has 3 C-C bonds in the carbon chain and 10 C-H bonds
What is alkane?Alkanes are saturated hydrocarbons. This means that their carbon atoms are joined to each other by single bonds.
Based on the diagram, butane is considered to be an alkane. It not only contains single covalent bonds, but also has carbon and hydrogen atoms present in its structure.
When comparing both structures to one another, isobutane is a branched chain, while butane is a linear chain.
Learn more about alkane here:
https://brainly.com/question/4260635
#SPJ2
