Answer: Here is why,
Explanation: Burning of wood is a example of both physical and chemical change. ... Another example is digestion of food ,first the food is chewed into small pieces this is a chemical change while in the actual digestion process it is chemically broken with the help of digestive enzymes and saliva
If 65,000 J of energy were transferred to 450 g of water at 20˚C. What would have been the final temperature of the water?
Answer:
500g
Explanation:
Answer:Suppose that during the Icy Hot lab that 65 KJ of energy were transfered to 450 g of water at 20 degrees C. What would have been the final temerpatur
Explanation:
Using the new ordering system, can we change the Lead and Silver rule to simply:
"Lead and silver salts are generally insoluble?" Why or why not?
Answer:
No, we change the Lead and Silver
Explanation:
The freezing temperature of lead decreases around the curves of AO as pure silver is applied to the lead material. Thus, in the case of platinum, AO is the freezing temperature curve of lead. Strong lead is in balance with fluid melting along this gradient (silver in lead solution).
Identifying Qualitative and quantitative Data
Sort the data collected about a colony of bacteria into qualitative or quantitative data.
spreads across plate
Qualitative Data
Qua
200 purple colonies total
circular in shape
stained purple
75 colonies did not stain purple
55 colonies grew at room temp
Answer:
qualitative data : quantitative data :
circular in shape 75 colonies ...
stained purple 200 purple ..
spreads across plate 55 colonies ...
Explanation:
i got it right :) .
Answer:
Same XD Have a bless day ^﹏^^O^^O^^O^
Explanation:
how many protons electrons and nuetrons does zn have
How many atoms of copper are in 0.137g of copper?
An aerosol can contains gas under a pressure of 2.0 atm at 20°C. Directions on
the can say that the can should be kept at less than 65°C. What would the
pressure in the can be at 65 °C?
Answer:
Explanation:
The volume is the same in both cases so the formula is
P1/T1 = P2/T2
T1 = 20 + 273 = 293 You have to convert Celcius to degrees Kelvin.
T2 = 65 + 273 = 338 degrees Kelvin
P1 = 2.0 atmospheres.
2.0 / 293 = P2/ 338
2*338 / 293 = P2
P2 = 676 / 293
P2 = 2.31 atmospheres
Helpppp fasttttttttttttttt Choose the best word to complete the sentence.
The teacher asked us to determine if the triangle was
a vegetal
C. Vertex
b. equilateral
d. negative space
Please select the best answer from the choices provided
Answer:
equilateral (B)
Explanation:
it is the only word which relates to triangles and their shape - plus, its logical and makes sense.
Answer:
its b
Explanation:
How much energy was absorbed by the water?
Explanation:
what are the two main phases of cell division
Answer:
Mitosis meiosis
Explain:
Mitosis is where the cell splits into 2 more cells (diploid)
Meiosis is where the cell splits into 2, and then split again, making 4 (haploid)
One isotope of Carbon(C) has exactly the same mass number and atomic mass since it was used as the definition of the atomic mass unit. Which isotope is it and what is it’s atomic mass?
Explain the arrangement of the first 20 elements in the periodic table.
Please help! Will give brainliest!
There are various kind of elements that are present in periodic table. Elements that are metals are kept on left side of periodic table and elements which are non metals are kept on right side of periodic table.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals and metalloids element arranges in increasing atomic number.
The first 20 elements of periodic table are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium and Calcium. Out of these Lithium, Beryllium, Sodium, Magnesium. Potassium and Calcium are metals so they are kept on the left side of the periodic table while others are non metals so they are kept on right side of periodic table.
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In step two of Experiment 4, you add sodium hydroxide to copper(II) nitrate and use a stirring rod to test if the solution is basic. How do you establish whether the solution is basic
Answer:
use litmus paper.
Explanation:
if red litmus paper turns blue solution is basic
blue litmus paper will remain blue if solution is basic
We can establish whether the solution in step two of experiment 4 is basic by carrying out litmus paper test. If the solution turns red litmus paper blue, then it is basic
In order to establish whether a solution is acidic, basic or neutral, litmus paper test could be carried out to know.
An acidic solution will turn blue litmus paper red
A basic solution will turn red litmus paper blue
A neutral solution does not have effect on blue or red litmus paper.
Therefore, in order to establish whether solution that resulted from adding sodium hydroxide to copper(II) nitrate in step two of Experiment 4 is basic, we could carry out a litmus paper test.
If the solution turns red litmus paper blue, then it is basic.
Hence, we could establish whether the solution in step two of experiment 4 is basic by carrying out litmus paper test. If the solution turns red litmus paper blue, then it is basic.
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as young adult how can you contribute in the situation on our country while we are facing the pendemic
Answer: You can give canned food to the poor or try helping people by donating money.
Explanation:
When you give canned food or packets of water the people who haven't eaten in ages or drank clean water can maybe help boost imunity.
When you give money you can help people buy things they need to survive this pandemic.
Answer:
Keep a positive attitude
Explanation:
Dont worry about thinks that put you down and try to think about something that helps keep up your spirits. For example, thinks that you are proud of.
Try to think a little less of things like this, ¨Great, now we have a pandemic, now the world is going to end¨ but to thy think more of ¨Hey, this is a time where people need help the most, lets do our best to help them. I believe I can make the world a better place because I have the power of postivity.¨
Put a smile n your face, stand up and say ¨today can be a great day!!¨
Why does water vapor
condense at higher
elevations?
A. cooling causes condensation
B. faster particle activity
C. due to a chemical change
D. due to a chemical reaction
Answer:
A. cooling causes condensation
Explanation:
air is cooler at higher altitude in the troposphere.
what are the two components present in the colloid
Answer:
the two components in colloid are dispersed phase and dispersing medium
I hope this helps
Which of the four models represents a solid
Answer:
is there an image
Explanation:
In the warm up, you reviewed the equation to calculate
kinetic energy. What question could you ask about kinetic
energy which will include the variables that affect it?
Answer:
Can be used to do work,and it can be converted to potential.
Explanation:
Answer: can it be used to do work
Explanation:
Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed.
Answer:
S²⁻(aq) + Cu²⁺(aq) ⇒ CuS(s)
Explanation:
Let's consider the molecular equation that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed.
Li₂S(aq) + Cu(NO₃)₂(aq) ⇒ 2 LiNO₃(aq) + CuS(s)
The complete ionic equation includes all the ions and the species that do not dissociate in water.
2 Li⁺(aq) + S²⁻(aq) + Cu²⁺(aq) + 2 NO₃⁻(aq) ⇒ 2 Li⁺(aq) + 2 NO₃⁻(aq) + CuS(s)
The net ionic equation includes only the ions that participate in the reaction and the species that do not dissociate in water.
S²⁻(aq) + Cu²⁺(aq) ⇒ CuS(s)
The net ionic equation includes only the ions that participate in the reaction and the species that do not dissociate in water.
S²⁻(aq) + Cu²⁺(aq) ⇒ CuS(s)
The molecular equation that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed.
Li₂S(aq) + Cu(NO₃)₂(aq) ⇒ 2 LiNO₃(aq) + CuS(s)
The complete ionic equation includes all the ions and the species that do not dissociate in water.
2 Li⁺(aq) + S²⁻(aq) + Cu²⁺(aq) + 2 NO₃⁻(aq) ⇒ 2 Li⁺(aq) + 2 NO₃⁻(aq) + CuS(s)
The net ionic equation includes only the ions that participate in the reaction and the species that do not dissociate in water.
S²⁻(aq) + Cu²⁺(aq) ⇒ CuS(s)
Thus, net ionic equation is S²⁻(aq) + Cu²⁺(aq) ⇒ CuS(s).
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You add 168.90 grams of NaCl to a container and then you add 616.00 grams of water to that same container What is the weight percent of NaCl in the containerI
Answer:
The weight percent of NaCl in the container is 21.5%
Explanation:
Given that,
Mass of NaCl = 168.90 gram
Mass of water = 616.00 grams
We need to calculate the weight percent of NaCl in the container
Using formula of percentage of weight
[tex]weight\ \%\ of\ component\ of\ the\ solution =\dfrac{weight\ of\ the\ component\ in\ the\ solution}{total\ weight\ of\ the\ solution}\times100[/tex]
Put the value into the formula
[tex]weight\ \%\ of\ component\ of\ the\ solution =\dfrac{168.90}{168.90+616.00}\times100[/tex]
[tex]weight\ \%\ of\ component\ of\ the\ solution=21.5\%[/tex]
Hence, The weight percent of NaCl in the container is 21.5%
Draw the Lewis structure for CF3PCF2 where all fluorines are bonded to a C atom
Answer:
See attached picture.
Explanation:
Hello.
As you can see on the attached picture, this Lewis structure requires all the elements to attain eight electrons after bonding, that is why the phosphorous is bonded with the two carbon atoms via a single bond with the carbon having the three fluorine atoms and a double bond with the carbon having the two carbon atoms.
Such arrangement is due to the fact that:
- P gets eight electrons by obtaining three from the two sided carbon atoms.
- The first carbon gets eight electrons from its initial four, three provided by each surrounding fluorine and one from the central phosphorous.
- Each fluorine gets eight valence electrons from their initial seven and one from the available carbon atoms.
Best regards.
What is the molar mass of Mg(ClO4)2?
Answer:
223.21 g /mol
Explanation:
To find the molar mass (g/mol) of a substance, you have to add the amu's of all the elements together. First you have to determine how of element there are:
Mg=1, Cl=2, O=8. Now you multiply the amu of each element by the number of elements in the compound. Then add them together. The amu of an element and its molar mass are the same.
1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol) = 223.31 g/mol
223.31 g/mol is the molar mass of the given compound. The molar mass of a material is a bulk attribute rather than a molecular one.
The ratio among the mass with the quantity of a substance (measured in mole) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The compound's molar mass represents an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average as well as a function of the relative distribution of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.
Molar mass=1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol)
= 223.31 g/mol
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what’s the answer??
Answer:
7.0
Explanation:
P1V1=P2V2 if temperature and moles are constant, which they appear to be
3.5*2.5=1.25x
x=8.75/1.25
x=7
a pan of boiling water on the stove is
conduction
convection
radiation
0.68 moles of calcium to calcium atoms
[tex]0.68 \: moles \: calcium \times \frac{6.02 \times {10}^{23} \: calcium \: atoms }{1 \: mole \: calcium} \\ [/tex]
The (( mole calcium ))s are simplified so the answer is based on the number of calcium atoms.
[tex]0.68 \times 6.02 \times {10}^{23} = 68 \times {10}^{ - 2} \times 602 \times {10}^{ - 2} \times {10}^{23} \\ [/tex]
[tex] = 68 \times 602 \times {10}^{ - 4} \times {10}^{23} = 40936 \times {10}^{19} \\ [/tex]
[tex] calcium \: atoms = 40936 \times {10}^{19} \\ [/tex]
_________________________________
And we're done.
Thanks for watching buddy good luck.
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Help me out i don’t not understand this
Explanation:
hope this helps!!! happy learning!!!!
How many days are in 5.75 weeks?
Answer:
There are 40.25 days in 5.75 weeks
Answer: 40.25
Hope this helped! :)
The kinetic energy of a golf ball is measured to be 143.3 J. If the golf ball has
a mass of about 47 g, what is its speed?
Answer:
V= in square root 2KE/M=2(143.3J)/0.047kg=6097.8723 in square root around 78.1 approxmete
Kinetic energy is directly proportional to the mass and square of speed of a moving body. Here, the speed of the body of mass 47 g or 0.47 kg with akinetic energy of 143.3 J is 24.6 m/s.
What is kinetic energy?Kinetic energy is a generated by virtue of motion of a body. It is half of the product of mass and square of velocity. Thus as mass is increase kinetic energy also increases.
If velocity is doubled then kinetic energy increases 4 times. Since velocity or speed is in square in the equation written as follows:
KE = 1/2 mv² . Here, m is the mass and v be the speed.
Here, kinetic energy is given 143.3 J and mass of the moving body is 0.47 kg and speed can be calculated by rearranging the equation as follows:
[tex]v = \sqrt{\frac{KE \times 2 }{m } \\\\\\ = \sqrt{\frac{43.3 J \times 2}{0.47 kg} \\\\\\\\\\\\\\ = 24.6 m/s[/tex]
Hence, the speed of the body of mass 47 g or 0.47 kg with akinetic energy of 143.3 J is 24.6 m/s.
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A student needs 1.52 moles of sodium hydroxide (NaOH). How many grams of sodium hydroxide are required? (1 mole NaOH = 40.00 grams NaOH) *
60.8 grams NaOH
1.00 grams NaOH
62.7 grams NaOH
0.038 grams NaOH
Answer:
1 molecule = 40.00 grams
1.52 molecules = 1.52*40.00
= 60.8 grams
(hurry will give brainliest)What element that has 5 Valence Electrons and 4 energy levels?
Answer:
arsenic (As)
Explanation:
A protein was previously determined to contain 16.2 wt% nitrogen. A 691 μL aliquot of a solution containing the protein was digested in boiling sulfuric acid. The solution was made basic and the liberated NH3 was collected in 10.00 mL of 0.0390 M HCl . A volume of 4.16 mL of 0.0155 M NaOH was required to react with the excess, unreacted HCl . Calculate the protein concentration of the solution in units of milligrams per milliliter.
Answer:
6.60mg N / mL
Explanation:
All nitrogen is converted in NH₃ that react with the HCl, thus:
NH₃ + HCl → NH₄⁺ + Cl⁻
In the problem, the excess of HCl reacts with NaOH, thus:
HCl + NaOH → NaCl + H₂O
The moles of NaOH = Moles of HCl in excess is:
4.16mL = 4.16x10⁻³L * (0.0155mol / L) = 6.448x10⁻⁵mol HCl in excess
Initial moles of HCl are:
10x10⁻³L * (0.0390mol / L) = 3.9x10⁻⁴moles HCl
That means the moles of HCl that reacts = Moles of NH3 = Moles of N are:
3.9x10⁻⁴ moles - 6.448x10⁻⁵moles = 3.2552x10⁻⁴ moles N.
To convert these moles to grams we need to use molar mass of N = 14.01g/mol:
3.2552x10⁻⁴ moles N * (14.01g/mol) = 4.56x10⁻³g * (1000mg / g) =
4.56mg of N
And volume in mL is:
691 μL * (1mL / 1000μL) = 0.691mL
Concentration in milligrams per mililiter is:
4.56mg N / 0.691mL =
6.60mg N / mL