Answer:
7.17 g/mL
Explanation:
Density = Mass / Volume
Given mass of object : 80.4g
We are not given the objects volume, however we are given that when put inside of a container with 20.0mL water, the level of the water rises to 31.2 mL.
31.2 - 20 = 11.2
The water level rose 11.2 mL when the object was placed inside of the cylinder containing the water therefore the object has a volume of 11.2mL
Now to find it's density
recall that density = mass / volume
mass = 80.4 and volume = 11.2mL
so density = 80.4/11.2 = 7.17 g/mL
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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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 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.
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]
Which nitrogen bases are needed to complete the DNA strand pictured below? Give your answer in order from top to bottom.
cytosine, thymine, cytosine, guanine
cytosine, thymine, guanine, guanine
thymine, cytosine, thymine, adenine
adenine, cytosine, adenine, guanine
Answer: Cytosine, Thymine, Cytosine, Guanine (option A)
Explanation:
In DNA strands, you must use base-pairing rules to complete strands.
The base-pairing rules are:
Adenine (A) bonds with Thymine (T)
Guanine (G) bonds with Cytosine (C)
By using these rules, you can pair the sequence GAGC with CTCG
The sequence CTCG is also represented as the bases Cytosine, Thymine, Cytosine, and Guanine, making A the correct answer.
I hope this helps!
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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Crystals most often form in igneous and metamorphic rocks. According to the rock cycle, which processes and features do these rocks share that likely promote the formation of crystals?
The features that are shared by the rocks include the melting and cooling of rocks.
What is a rock?It should be noted that a rock simply means a relatively hard naturally occurring mineral material.
Crystals most often form in igneous and metamorphic rocks. The processes that these rocks share that likely promote the formation of crystals is the melting and cooling of rocks.
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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]
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
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:
This is a diagram of fossils found in the same area. Jamie wanted to know which layer of fossils is the oldest, so he
asked his mom. Which layer of fossils did Jamie's mom tell him was the oldest?
A)
Layer 1
B)
Layer 2
C)
Layer 3
D)
Layer 4
Answer:
D
Explanation:
The bottommost layer is always the oldest.
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
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 are atoms related to balancing a chemical equation?
Atoms are related to balancing equations because the amount of atoms on the left of the equation (reactants) needs to be the same amount on the right (products).
For example, 2H₂ + O₂ → 2H₂O
If you count the amount of hydrogen atoms on both sides each, there would be 4 (make sure to multiply the coefficient by the subscripts).
If you count the amount of oxygen atoms on both sides each, there will be 2 of them (2 in a molecule of oxygen)
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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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I have a container of gas at a pressure of 2.4 atm and a temperature of 343 K with a moveable piston and a small opening that has an initial volume of 36 liters. If I raise the pressure to 4.1 atm, decrease the temperature to 313 K, and measure the final volume to be 51 liters, what is the final number of moles present inside the container if the container held 3.7 moles to begin with? Give your answer in 2 decimals places.
Answer: RAWRR
Explanation:RAWRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
[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.
hey guys pls answer this question
Answer:3. B 4. C
Explanation:
Answer:
Explanation: have a nice day
SOMEONE HELP NO LINKS PLZ answer Questions 1–6 based on Figure 1.
1. How many protons are shown? _____________________________________
2. In the periodic table, elements are ordered by atomic number, the number of protons in an atom’s nucleus. Using the periodic table in your textbook, identify the element shown. ________________________________________
3. How many electrons are shown? ____________________________________
4. How many electrons are in the outermost energy level? _____
5. If the number of electrons equals the number of protons, then there is no charge, and the model shows a neutral atom. If the numbers are not equal, then you have an ion. Use this reasoning to determine if Figure 1 shows an ion or a neutral atom. _______________________________
To determine a particle’s charge, you must compare the number of protons with the number of electrons. Use the spaces to the right to subtract the number of electrons from the number of protons. (Remember, if the number of electrons is greater than the number of protons, the charge will be negative.)
Answer:
element argon, protons 18 , electrons 18 , outer most energy level 8
An atom has 6 electrons in its outer orbit. It will most likely form an ion with a charge of:
(a) 6-
(b) 6+
(c) 2-
(d) 2+
Answer:
c
Explanation:
A student reads the volume in a buret as 7.89 ml. The teacher checks the buret, and the actual value for the volume is 7.77 ml. What is the student's percent error?
Answer:
1.54%
Explanation:
Percent error is found as finding the value of measured value versus actual value, dividing it by the actual value written in absolute notation (percent error, the accuracy of the measured value cannot be negative) times 100 to find it as percent.
This is how we express it as a formula:
[tex]percent~error=\frac{|measured-actual|}{actual} * 100%[/tex]
Plugging in the numbers means we have to understand what goes where. Measured value is what the student measured, and the actual value is the correct answer.
Given this information,
[tex]percent~error=\frac{|7.89-7.77|}{7.77} * 100\\percent~error=\frac{|0.12|}{7.77} *100\\percent~error=0.015444*100\\percent~error=1.54%[/tex]
Found of to three significant figures 35.7823 m
[tex]\\ \tt\bull\rightarrowtail 35.7823[/tex]
Round one by one[tex]\\ \tt\bull\rightarrowtail 35.782[/tex]
[tex]\\ \tt\bull\rightarrowtail 35.78[/tex]
[tex]\\ \tt\bull\rightarrowtail 35.8[/tex]
Done
If the reaction 2HgO --> 2Hg + O2 is endothermic, which bonds are the strongest?
The bonds between Hg atoms in the solid metal.
The bond between Hg & O.
The bond between O & O.
Now
HgO is Omitted from our solution option.Hg is a atom so no bonds hence no bond strength occurs.
O_2 is a molecule and so it's our answer .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
Explain the relationship between the speed of atoms and the state of matter of a substance
Answer:
The faster the molecules of a substance move, the higher the kinetic energy, and the higher the temperature. The slower the molecules move, the lower the kinetic energy, and the lower the temperature.
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
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
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 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
Which of the following is a sign a chemical reaction has occurred?
Answer: Color change, fizing, bubbling, whether it’s hot or cold.
Explanation:
