Answer:
As a result, the answer is
B. The sun breaks the bonds that hold liquid water's molecules together.
Explanation:
evaporation is a process by which an element or compound transitions from its liquid state to its gaseous state below the temperature at which it boils.
Here in first option, we see melting. ice to water.Here in second option we see liquid turns to gas, which is evaporation.Here in third option, we see attraction between water molecules are becoming stronger.Food deteriorates more slowly in a refrigerator because?
Answer:
as temperature increases it speeds up chemical reactions and that accelerates the spoiling process of food. Keeping food in a cold place (a fridge) slows down those processes.
[tex]\bold{Choose \: the \: correct \: Answer :D\: }[/tex]
Answer:
Option B is correct.
Explanation:
Distance refers to the distance traveled by a body.
Hope it will help you.
In order for rollercoaster to work, why does the hill the cart climbs need to be higher than the top of the loop?
Answer:
"At the top of the first and tallest hill, your potential energy is at its highest it will ever be on this ride. As you begin to descend, your potential energy decreases until it's all gone at the bottom of the hill." The shorter the hill the roller coaster climbs, the greater its kinetic energy.
Can someone help with this, i’m getting lost in the steps. Like I start off right (i think) then it just gets confusing.
Answer:
28.12 kg
Explanation:
Here we are given that the density of copper is 8.92 g/ cm³ .
[tex]\sf \longrightarrow \rho_{(copper)}= 8.92 g/cm^3\\ [/tex]
And we are interested in finding out the mass of the given block . The dimensions of the block is 0.052m × 311mm × 19.5 cm .
Firstly find out the volume in cm³ as the density is in cm³ .[tex]\sf \longrightarrow Volume_{cuboid}= length * breadth * height \\ [/tex]
1cm = 0.01 m 1cm = 10mm[tex]\sf \longrightarrow Volume = (0.052)(100) * (311\div 10) *(19.5) cm^3 \\ [/tex]
[tex]\sf \longrightarrow Volume = 5.2 * 31.1 * 19.5 cm^3 \\ [/tex]
[tex]\sf \longrightarrow Volume = 3153.54 cm^3\\ [/tex]
Now we may use Unitary Method to find out the mass of the block as ,
Mass of 1cm³ of copper is 8.92 g .
Mass of 3153.54 cm³ of copper will be 8.92*3153.54 g = 28129.57 g
And we know that 1kg = 1000g , so[tex]\sf \longrightarrow \underline{\boxed{\bf Mass_{Cu}= 28.12 \ kg }} \\ [/tex]
name any two metals having high density
Answer:
Aluminium
Potassium
Answer: Hydrogen
Sodium Magnesium Aluminium
Potassium Calcium Gallium
Rubidium Strontium Indium
Caesium Barium Thallium
Explanation:
how many moles of KCIO3 must be consumed to create 4.5 moles of KCI
Answer:
4.5
Explanation:
2KClO3 ===> 2KCl + 302
Let the number of moles of KClO3 = x
2KClO3 ===> 2KCl + 302
Since the balance numbers are the same for both chemicals KClO3 and KCl whatever you need to get for KCl will be the same as for the KCl
x = 4.5
Hi, im really confused can someone help
Answer:
Point - C
Explanation:
Ethylamine has a molar mass = 45.08 g/mol
While, HBr has molar mass = 80.91 g/mol
This means ethylamine will travel more distance than HBr in given time.
So, the white solid (Ethylammonium bromide) will form at point C.
Why Point C?
Point C is the only point which is farthest from ethylamine and closest to HBr. This point depicts that ethylamine has travelled more distance than HBr.
I need an answer now please asap and you will me marked brainiest please it's missing I need it now.
Answer:
alll of them are possible, besides the last one
Explanation:
All of them are correct compounds besides the last one. The last one isn’t a correct compound because the second element does not exist
#NaO_2
ImpossibleNa has valency 1 so O can never have 2 as subscript.Correct compound=Na_2O
#MgCl_2
PossibleValency of Mg is 2 and Cl is 1 so yes#CaF
ImpossibleCa has valency 2 not 1#NaBr
PossibleNa has valency 1 and Br has 1#KHe
ImpossibleHelium is a noble gas so can't form compounds
Which of the following are chemical
changes?
(a) Growth of a plant (b) Rusting of iron (c) Mixing of iron filings and sand (d) Cooking of food (e) Digestion of food (f) Freezing of water (g) Burning of a candle
Answer:
The chemical changes are as follows:
Explanation:
Growth of a plant Rusting of ironCooking of food Digestion of food Burning of a candle.
-TheUnknownScientist 72
Explanation:
a, b, d, e and g
hope it's helpful
Magnesium reacts with iron chloride solution.
3 Mg + 2 FeCl3 ⟶ 2 Fe + 3 MgCl2
0.120 g of magnesium reacts with excess iron chloride solution.
Relative atomic masses (Ar): Mg = 24 Fe = 56
Calculate the mass of iron produced, in mg
Show your working.
Answer:
0.1876g
Explanation:
Since iron is in excess, therefore Magnesium is the limiting reactant.
Moles of Mg = mass/molar mass
0.120/24 = 0.005 moles
Compare the coefficient ratio of Mg and iron.
Ratio is 3 : 2
To find moles of iron we take 2/3 x 0.005
Moles of iron is 0.00335 moles
Mass = moles x molar mass
= 0.00335 x 56
= 0.1876g
Taking into account the reaction stoichiometry, 0.186 grams of Fe are produced when 0.120 g of magnesium reacts with excess iron chloride solution.
Reaction stoichiometryIn first place, the balanced reaction is:
3 Mg+ 2 FeCl₃ → 2 Fe+ 3 MgCl₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 3 molesFeCl₃: 2 moles Fe: 2 molesMgCl₂: 3 molesThe molar mass of the compounds is:
Mg: 24 g/moleFeCl₃: 162.35 g/moleFe: 56 g/moleMgCl₂: 94.9 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Mg: 3 moles ×24 g/mole= 72 gramsFeCl₃: 2 moles ×162.35 g/mole= 324.7 gramsFe: 2 moles ×56 g/mole= 112 gramsMgCl₂: 3 moles ×94.9 g/mole= 284.7 gramsMass of iron producedThe following rule of three can be applied: if by reaction stoichiometry 72 grams of Mg form 112 grams of Fe, 0.120 grams of Mg form how much mass of Fe?
[tex]mass of Fe=\frac{0.120 grams of Mgx112 grams of Fe}{72 grams of Mg}[/tex]
mass of Fe= 0.186 grams
Then, 0.186 grams of Fe are produced when 0.120 g of magnesium reacts with excess iron chloride solution.
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Classify the following reaction:
CaO(s) + H₂O(l) → Ca(OH)₂(s)
A) synthesis (or combination)
B) decomposition
C) combustion
D) single displacement (replacement)
E) double displacement (replacement)
Answer:
D) I think is single displacement (replacement)
Which of the following examples describes a publicly held corporation?(1 point)
A local gaming cafe is owned and operated by the same group of friends that founded it years ago. Nobody holds stock in the gaming cafe.
A local gaming cafe is owned and operated by the same group of friends that founded it years ago. Nobody holds stock in the gaming cafe.
A local jewelry store is owned by its founders who hold but do not sell shares in the company.
A local jewelry store is owned by its founders who hold but do not sell shares in the company.
A nation-wide fast-food chain is owned and operated by the same family that founded it. Nobody holds stock in the fast-food chain.
A nation-wide fast-food chain is owned and operated by the same family that founded it. Nobody holds stock in the fast-food chain.
A small restaurant chain, founded and operated by a single family, is owned by shareholders who purchase their shares on the stock exchange.
Answer:
A small restaurant chain, founded and operated by a single family, is owned by shareholders whi purchase their shares on the stock exchange.
Explanation:
This is because publicaly help cop is usually ownership is zdetermined via shares of stovk
HOPE THIS HELPS
4. How many feet are in 3.45 km?
Answer:
11318 feet and 10.771 inches
Explanation:
there is 3280.84 in one Km
just do 3280.84x3.45
yourown definition of molecular
polarity
Answer:
Polarity is caused by the difference in electronegativity (EN) of a compound. For example, water, H2O, is polar because oxygen's EN is much higher than hydrogens. Therefore, the electrons spend more time around the oxygen and less time around the hydrogen causing a slightly positive pole at the hydrogens and a slightly negative at the oxygen. Most polar molecules are not symmetrical (like water). Non-polar molecules like CH4 (methane) do not have poles.
Hope that helps
What quantity in moles of LiBr are in 66.1 grams of LiBr?
Molar mass of LiBr
7+80=87g/mol[tex]\\ \sf\hookrightarrow No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \sf\hookrightarrow No\:of\:moles=\dfrac{66.1}{87}[/tex]
[tex]\\ \sf\hookrightarrow No\:of\:moles=0.75mol[/tex]
what do uh mean by ionic or electrovalent bond ?
thankyou ~
This is a type of bond present in electrovalent compounds.
What is Electrovalent Bond?This is a type of bond that exist in electrovalent or ionic compounds. It is formed as a result of combination between a positive cation and a negative anion. This results in the transfer of electron from the cation to the anion. This type of bond in which there's a complete transfer of electrons between both parties occurs easily as a result of the electronegative difference between the combining atoms. Compounds that show this type of bonding are combination between group 1 or 2 elements with group 16 or 17 elements.
Compound formed through this bond are strong, mostly dissolves in polar solvents due to their polar charges and also conducts electricity.
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Which of the following is a sign a chemical reaction has occurred?
Answer: Color change, fizing, bubbling, whether it’s hot or cold.
Explanation:
Which area is most likely closest to a salt marsh or an estuary?
A. A lake.
B. A prairie
C. A coastline
D. The mountains
Answer:
coastal area with very high tides deep ocean water miles from a river's mouth
Explanation:
Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges(National Geographic Society).
hope dis help
Please help me with this one true or false
Answer:
41. False
42. True
43. False
44. False
45. True
46 - 48. Unsure (I don't take Biology, sorry.)
Explanation:
41.
FeS and HCl are the reactants of the chemical equation. Hence, false.
42.
It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.
43.
Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.
44.
Fluorescence is actually the emittance of light by any substance due to radiation. Hence, false.
45.
Yes, the image produced by a plane mirror is laterally inverted. Hence, true.
Sound travel at a velocity of 333 m/s. How long does it take for sound to travel the length of a 100.0 yard football field
(1 inch = 2.54 cm)
Answer:
It takes 0.27 second to travel the distance of 100 yard
Explanation:
We can use the formula ( t = d / s )t = d / s = 91 m / 333 m/s = 0.27 s
In cold climates, rocks are broken into pieces by the action of water. This process that breaks down rocks and helps form soil can best be explained as
Oleaching of minerals from the rock.
decomposition due to the action of ice crystals.
chemical weathering due to water reacting with calcite.
mechanical weathering due to alternate freezing and thawing.
Answer:
The answer is chemical weathering due to water reacting with calcite
Explanation:
The causes of chemical weathering include the action of water, oxyen, carbon dioxide, living organisms, and acid rain.
How many moles of Sulfur (S) are equal to 1.806 x 10^24 atoms Sulfur?
a) 1.000 mole S
b) 3.000 mole S
c) 1.100 x 10^48 mole S
Answer:
b) 3.000 mol S
Explanation:
using Avogadro's constant
1 mol = 6.02 × 10^23 atoms
we need to find the number of moles for 1.806 × 10^24
x = 1.806 × 10^24
putting it together we now have:
1 mol = 6.02 × 10^23 atoms
x = 1.806 × 10^24
cross multiply
6.02 × 10^23 x = 1.806 × 10^24
divide both sides by 6.02 × 10^23
x = (1.806 × 10^24) ÷ (6.02 × 10^23) = 3 mol
The optimum drinking temperature for a Shiraz is 15.0 ∘C . A certain bottle of Shiraz having a heat capacity of 3.40 kJ∘C−1 is 23.1 ∘C at room temperature. The heat of fusion of ice is 6.02 kJmol−1 and the heat capacity of ice is 2.108 Jg−1∘C−1. Assume that no heat is lost to the rest of the surroundings. What minimum mass of ice, originally at -5.0 ∘C , is required to bring the final temperature to 15.0 ∘C ?
We have that the minimum mass of ice , required to bring the final temperature to 15.0 ∘C is mathematical given as
m=67.9gFrom the question we are told
The optimum drinking temperature for a Shiraz is 15.0 ∘C . A certain bottle of Shiraz having a heat capacity of 3.40 kJ∘C−1 is 23.1 ∘C at room temperature. The heat of fusion of ice is 6.02 kJmol−1 and the heat capacity of ice is 2.108 Jg−1∘C−1. Heat releasedGenerally the equation for the Heat released is mathematically given as
Q=cDT
Q=3.4*8.1*10^3
Q=27540J
Therefore
Heat absorded
H=m*4*2.108+m/18*6.02*10^3+m*15*4.18
H=405.58mJ
THerefore
[tex]m=\frac{27540J}{405.58}[/tex]m=67.9g
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Match these items.
1 .
water droplets
necessary organisms in nitrogen cycle
2 .
denitrification
release of nitrogen from nitrogen compounds
3 .
bacteria and plants
process of using oxygen to obtain energy from carbon-containing food
4 .
respiration
forms as water vapor condenses
5 .
people and animals
use plants for food
Mary has blue eyes (bb) and David has brown eyes (Bb), if David and Mary have four children
what will their eye color be? Will all of their children have the same eye color? Why or why not.
Answer:
If they all had the same eye color it would probably be hazel, but If they did not then it would either be blue or brown.
Explanation:
Hope this helps
How is a covalent bond formed between two atoms?
Answer:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
Explanation:
14. Through which of the following mediums is the velocity of a sound wave the greatest?
A. Air
B. Water
C. Steel
D. Lead
Option C is the right answer
The medium through which the velocity of a sound wave is greatest is: C. steel.
What is a sound wave?A sound wave can be defined as a form of mechanical wave that requires a medium for its propagation and it creates a disturbance in the medium. Thus, a sound wave needs a medium to travel and it creates a disturbance when it travels through any medium.
The parameters of sound wave.Some examples of the parameters of a sound wave include the following:
FrequencyWavelengthAmplitudeVelocityGenerally, the velocity of a sound wave is greatest in a solid medium such as steel than in liquid or gaseous medium.
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2. An elements has the atomic number of 12. A mass
number 24. Find a number of neutrons.
b. number of Elections.
a number of Protons.
serbec
Answer a) 12 neutrons
b) 12 electrons
a) 12 protons
Explanation:
The atomic number is the number of protons in an atom and is also the number of electrons
therefore, the number of protons and electrons = 12
the mass number of an element is = # of protons + # of neutrons
if we rearrange it to find # of neutrons,
# of neutrons = mass number - # of protons
so, 24 - 12 = 12 neutrons
If 550 mL of a 3.50 M KCl solution are set aside and alowed to evaporate unti the
volume of the solution is 275 ml, what will the molarity of the solution be?
1) list givens and convert if necessary
C₁ = 3.50 mol/L
V₁ = 0.550 L
C₂ = ?
V₂ = 0.275 L
2) rearrange formula
[tex]C_{1}V_{1}=C_{2}V_{2}\\\\C_{2}=\frac{C_{1}V_{1}}{V_{2}}[/tex]
3) solve
[tex]C_{2}=\frac{(3.50\ mol/L)(0.550\ L)}{(0.275\ L)}[/tex]
C₂ = 7.00 mol/L
can someone please answer this question for me? i will mark brainliest and it would also be really appreciated! :)
During an experiment water was heated in a container covered with a glass lid. The following observations were recorded.
Observation 1: Water droplets form on the inside of the glass lid.
Observation 2: Bubbles rise as the water starts boiling.
Based on the observation, justify the type of change (physical or chemical) that took place. (4 points)
Based on the observations, the change is physical.
This is because the matter is still the same composition after the change, while a chemical change would change the composition.
Based on the observations, both physical and chemical changes have occurred during the experiment.
Observation 1: Water droplets form on the inside of the glass lid. This is a physical change.
Observation 2: Bubbles rise as the water starts boiling. This is a chemical change.
A physical change is a transformation in a substance's state, shape, or form that does not alter its chemical composition or create new substances. During a physical change, the original substance remains the same, and no chemical bonds are broken or formed.
A chemical change, also known as a chemical reaction, involves the conversion of one or more substances into new substances with different chemical compositions. Evidence of a chemical change includes the production of gas, formation of a precipitate, release or absorption of heat or light, and changes in color and odor.
In observation 1, the water vapor in the air comes into contact with the cooler glass surface of the lid and condenses back into liquid water. Condensation is a physical change where a gas changes into a liquid.
Observation 2- Boiling is the process of converting liquid water into water vapor (gas) by absorbing heat energy. The heat causes water molecules to gain energy and transform into gas, forming bubbles that rise to the surface. This change involves the breaking of intermolecular forces between water molecules and is a chemical change.
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