Answer:
0.292 g/mL.
Explanation:
From the question given above, the following data were obtained:
Mass of object = 28.1 g
Volume of object = 96.2 mL
Density of object =..?
Density of an object is simply defined as the mass of the object per unit volume of the object. Mathematically, it can be expressed as:
Density = mass / volume
With the above formula, we can obtain the density of the object as follow:
Mass of object = 28.1 g
Volume of object = 96.2 mL
Density of object =..?
Density = mass / volume
Density = 28.1 / 96.2
Density of object = 0.292 g/mL
Thus the density of the object is 0.292 g/mL
Give the formula of the alkanes his molecule contains 28 hydrogen atoms
Answer:
jayfeather friend me
Explanation:
Table 1. Summary of the Straight-Chain Alkanes
Name Formula Number of Structural Isomers
Octadecane C18H38
Nonadecane C19H40
Eicosane C20H42 366,319 (!)
29 more rows
The formula of the alkanes the molecule contains 28 hydrogen atoms is [tex]C_1_3H_2_8[/tex], i.e., tridecane.
What are alkanes?Alkanes are organic compounds made up entirely of single-bonded carbon and hydrogen atoms with no other functional groups.
Alkanes have the general formula CnH2n+2 and are classified into three types: linear straight-chain alkanes, branched alkanes, and cycloalkanes.
Alkanes are important raw materials in the chemical industry and the main component of gasoline and lubricants.
Natural gas is primarily composed of methane and ethane and is used for heating, cooking, and power generation (gas turbines).
Natural gas and petroleum are separated from the alkanes. Natural gas is primarily composed of methane, with trace amounts of other low molecular weight alkanes.
All other alkanes are derived from petroleum, which is a complex mixture of many compounds.
Here, the formula for 28 hydrogen atom containing alkane is
[tex]C_1_3H_2_8[/tex]
Thus, this given formula is of tridecane.
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There are many important laws and theories in science. Which of the following is a law of science?
A living thing is made of at least one cell.
ОО
An atom is made of electrons orbiting a nucleus.
Gravity will pull two objects toward each other.
Natural selection will change species to fit their environments.
Answer: the answer is C
Explanation:
Answer:C
Explanation:I got it correct
Which types of energy transformations does a television make?
Electrical energy to energy of motion and heat energy
Electrical energy to heat energy and light energy
Electrical energy to sound energy and energy of motion
Electrical energy to sound energy and light energy
Answer:
d.
Explanation:
the electricity is why we can hear sounds from the television and see it
When going down a slope on a roller
coaster, does your stomach actually
move up?
Answer:
yes
Explanation:
due to gravity &hggggggggg%ggghhbvvvghh
1. Imagine that you need to take a medicine that the doctor has prescribed for
you. Explain why scientists who developed that medicine would need to know
whether or not the compound in that medicine is polar. How might a polar
medicine behave differently as it dissolved in the body than a nonpolar medicine
would? Answer in 1 to 2 paragraphs. (10 points) Think about how polar and
nonpolar compounds might behave differently in the watery environment of your
stomach or bloodstream
Answer: Only non-polar medicines can diffuse across the membrane. non-polar drugs are lipid soluble, while polar drugs are water soluble, so polar drugs cant absorb through biological membranes.
A kerosene stove that produces 0.8 g/hr of carbon monoxide (CO) is used in a closed room with a volume of 200 m3. Fresh air enters the room at the rate of 40 m3/hr and stale air leaves at the same rate. Assuming complete mixing and that carbon monoxide is a conservative pollutant (i.e., does not undergo decay), determine the steady state CO concentration
Answer:
20 mg/m3
Explanation:
Given -
S = 0.8 g/hr
Q = 40m3/hr
V =200 m3
As we know, the steady state CO concentration is given by
Css = S/Q
= 0.8/(40m3/hr)
= 800 mg/hr/(40m3/hr)
= 20mg/m3
Hurry I need Now!!!In which biome would the climax species be reached most quickly following a fire?
A Taiga
B desert
C Grassland
D. deciduous forest
E tropical rain forest
Answer:
D. Deciduous Forest.
Explanation:
What does the symbol (s) represent when it is next to an atom?
Answer:
The symbol for an atom indicates the element via its usual two letter symbol, the mass number as a left superscript, the atomic number as a left subscript (sometimes omitted), and the charge as a right superscript.
Explanation:
I hope that helps!! sorry if it dont!
Each of the following organs had a role in excretion, EXCEPT for the _____?
A. Lungs
B. Kidneys
C. Heart
D. Skin
Each of the following organs had a role in excretion, except for the Heart. Therefore, the correct option is option C.
What is excretion?Excretion seems to be the process throughout which an organism eliminates metabolic waste. In vertebrates, this is largely done by that of the skin, kidneys, especially lungs. When a substance is secreted, this could perform certain roles once it leaves the cell. Excretion is required by all forms of life.
Animals, for example, use the urethra, a member of the excretory, to evacuate urine. In unicellular organisms, waste products are ejected quickly via the cell surface. During biological functions, such as cellular respiration, a variety of chemical changes occur in the body. Each of the following organs had a role in excretion, except for the Heart.
Therefore, the correct option is option C.
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How many hydrogen atoms are in the compound represented by the following bond-line drawing?
ОН
Answer:
Theres no drawing
Explanation:
Show drawing
Skeletal structural diagram and bond-line drawing are similar;
Parts of the question appear missing: The number of hydrogen atoms in the attached example bond-line drawing is 6 hydrogen atoms
The reason the above value is arrived at for the attached example bond-line diagram is as follows;
A bond-line drawing is the diagram showing the molecular structure of a compound, such that covalent bonds within the molecule are represented by lines with the number of lines indicating the number of covalent bonds.
A single covalent bond is represented by one line, double bonds by two lines while three parallel lines represents a triple bond.
In bond-line drawing, the lines symbolically infer the carbon to carbon bonds while the bonds to the hydrogen atoms are implied noting that each carbon has four covalent bonds. Hydrogen atoms attached to other heteroatoms are indicated with an H.
The number of hydrogen shown in the example diagram can be found by noting that the number of covalent bonds between the carbon atoms are three, therefore, the atom of the fourth bond not shown with a line is to a hydrogen atom
There are six such carbon atoms, one of which is attached to an oxygen atom, which gives five hydrogen atoms located on the ring
There is one more hydrogen atom attached to the oxygen in the hydroxyl group, the total number of hydrogen is therefore;
5 hydrogen on ring + One hydrogen in the hydroxyl group = 6 hydrogen atoms
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The density of copper is listed as 8.94 g/mL. Two students each make three density determinations through experimentation. Student A's measurements are 6.3 g/mL, 8.9 g/mL, and 11.1 g/mL. Student B's measurements are 8.3 g/mL, 8.2 g/mL, and 8.4 g/mL. Compare the two sets of results in terms of precision and accuracy.
Answer:A) After the values are added, we determine how many significant figures are involved by looking at the decimal places of the original values. 52.13 had only 2 digits past the decimal point so the answer can only contain 2 significant numbers after the decimal point which would be 53.88 g
Explanation:
What can scientists do or use to predict when and where natural hazards could occur?
Answer:
Earth Scientists Use Fractals To Measure And Predict Natural Disasters.
Explanation:
Answer:they can use fractals
Explanation:
15 The picture shows Earth’s rotation. Which pattern listed below is caused by Earth’s rotation? A Water cycle processes B Length of shadows C Seasonal temperatures D Weathering and erosion HELP ME
Answer:
jayfeather friend me
Explanation:
Hence it is quite important to understand and learn the processes of the water cycle.
Step 1: Evaporation. The water cycle starts with evaporation. ...
Step 2: Condensation. ...
Step 3: Sublimation. ...
Step 4: Precipitation. ...
Step 5: Transpiration. ...
Step 6: Runoff. ...
Step 7: Infiltration.
Iontophoresis is a noninvasive process that transports drugs through the skin without needles. In the photo, the red electrode is positive and the black electrode is negative. The electric field between the electrodes will drive the negatively charged molecules of an anesthetic through the skin. Should the drug be placed at the red or the black electrode
Answer:
Follows are the explanation to this question:
Explanation:
When the drug is negatively charged, its negative electrolyte is annihilated to just the positive electrode. It is enticed, and it may not have a picture showing the electrode, however, We suppose that electrodes from either side of a skin slice. Its negative electrode will bypass or push thru the skin if in front of the counter terminal this becomes a red-positive electrode.
Question 1 (1 point)
Stars come in different
a:colors
b:sizes
c:temperatures
d:all of the above
PLESE HELP ANYONE HURRY!
Answer:
All of above.
Explanation:
Stars. They come in different sizes, temperatures, and colors. Not all are yellow, and not all are small or big. Some can be hot, and others can be cold. Stars can exist for a while, years on end. It just varies on how long it's been there.
I hope this helps you!
Describe the motion of a person NOT wearing a seat belt if the car stops suddenly
A the person and car will stop together
B the person will stop faster than the car because they are lighter
C the car will stop and the person will keep moving forward
D the car will stop and the person will speed up
Answer:
c the car will stop and the person will keep moving forward
Explanation:
Because since the person has no force apllied they will keep moving until force is apllied.
2. The boiling point of a solution containing 6.4 g of the hormone adrenaline in 360 g of
CCl4 is 0.49 K higher than the boiling point of pure CC14. Calculate the molar mass of
adrenaline. (K = 5.02 kg K/mol).
Answer:
MM = 182.13g/mol
Explanation:
Hello!
In this case, since the boiling point elevation is computed via:
[tex]\Delta Tb=i*m*K[/tex]
Thus, since adrenaline is nonionizing, we can compute the molality at first instance:
[tex]m=\frac{\Delta Tb}{i*K}=\frac{0.49K}{1*5.02kg\frac{K}{mol} } \\\\m=0.0976mol/kg[/tex]
Now, we compute the the moles of adrenaline in 360 g (0.360 kg) of CCl4:
[tex]n=0.0976mol/kg*0.360kg\\\\n=0.0351mol[/tex]
Finally, the molar mass:
[tex]MM=\frac{6.4g}{0.0351mol}\\\\MM=182.13g/mol[/tex]
Best regards!
Define
wheel and axel
Answer:
A wheel and axle is a simple lifting machine that consists if rope that unwind a wheel onto a cylindrical drum/ shaft to provide mechanical advantage.
wheel and axle is a simple machine having two co-axial cylinder of different radii fitted to a common axies.
Please Help! (Chemistry Molecules to Grams)
Answer:
20.95 g of caffeine, C₈H₁₀N₄O₂
Explanation:
From the question given above, the following data were obtained:
Number of molecules of C₈H₁₀N₄O₂ = 6.5×10²² molecules
Mass of C₈H₁₀N₄O₂ =?
From Avogadro's hypothesis,
1 mole of C₈H₁₀N₄O₂ = 6.02×10²³ molecules
Next, we shall determine the mass of 1 mole of C₈H₁₀N₄O₂. This can be obtained as follow:
1 mole of C₈H₁₀N₄O₂ = (8×12) + (10×1) + (4×14) + (2×16)
= 96 + 10 + 56 + 32
1 mole of C₈H₁₀N₄O₂ = 194 g
Thus,
194 g of C₈H₁₀N₄O₂ = 6.02×10²³ molecules
Finally, we shall determine the mass of caffeine, C₈H₁₀N₄O₂ that contains 6.5×10²² molecules. This can be obtained as follow:
6.02×10²³ molecules = 194 g of C₈H₁₀N₄O₂
Therefore,
6.5×10²² molecules = (6.5×10²² × 194) / 6.02×10²³
6.5×10²² molecules = 20.95 g of C₈H₁₀N₄O₂.
Therefore, 20.95 g of caffeine, C₈H₁₀N₄O₂ contains 6.5×10²² molecules
How is the effect of concentration changes on the reaction rate seen in the
rate law?
A. The effect of concentration changes on the rate constant affects
the reaction rate.
O B. A change in concentration of a reactant would change the
exponent of that reactant.
O C. The rate law does not show how concentration changes would
affect the reaction rate.
D. The exponents determine how much concentration changes affect
the reaction rate.
Answer: D. The exponents determine how much concentration changes affect the reaction rate.
Explanation: This is correct. The exponents in the rate law do determine how much the concentration changes impact the reaction rate.
Option A i.e. The effect of concentration changes on the rate constant affects the reaction rate.
what is rate constant?
The proportionality constant, which explains the link between the molar concentration of the reactants and the pace of a chemical reaction, is known as the rate constant. The rate constant, also known as the reaction rate constant or reaction rate coefficient, is indicated by the letter k. Because reactant concentrations decrease as reactants are transformed to products, reaction speeds typically decrease over time. When reactant concentrations are raised, reaction rates generally increase. The temperature has an impact. The following are two methods for calculating rate constant:
Using the Arrhenius formula.The order of the reaction and the molar concentrations of the reactants are used.To know more about rate constant here
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If H3O+ is an acid according to Brønsted-Lowry, what is its conjugate base?
Select one:
Need ASAP please
a. H4O2+(aq)
b. H+(aq)
c. H2O(aq)
d. OH-(aq)
Answer:
C. H20(aq)
Explanation:
Suppose of nickel(II) bromide is dissolved in of a aqueous solution of potassium carbonate. Calculate the final molarity of nickel(II) cation in the solution. You can assume the volume of the solution doesn't change when the nickel(II) bromide is dissolved in it. Round your answer to significant digits.
The question is incomplete, the complete question is;
Suppose 1.87g of nickel(II) bromide is dissolved in 200.mL of a 52.0mM aqueous solution of potassium carbonate. Calculate the final molarity of nickel(II) cation in the solution. You can assume the volume of the solution doesn't change when the nickel(II) bromide is dissolved in it. Be sure your answer has the correct number of significant digits. The answer is needed in M.
Answer:
0.0428 M
Explanation:
The equation of the reaction is;
NiBr2 + K2CO3 → NiCO3 + 2KBr
Number of moles of NiBr2 = mass/molar mass = 1.87 g/218.53 g/mol =
8.557 * 10^-3 moles
Now, we know that the Ni^2+ comes from the NiBr2. Also, the concentration of Ni^2+ in NiBr2 = concentration of Ni^2+ in NiCO3
So,
Concentration of Ni^2+ = 8.557 * 10^-3 moles/0.2 L = 0.0428 M
which changes when gases condense to form liquids
In condensation, matter changes from a gas to a liquid. All matter is made of tiny moving particles called molecules. Evaporation and condensation happen when these molecules gain or lose energy. This energy exists in the form of heat.
Potassium nitrate, bKNO3 , is 38.7% potassium by mass. If you have 300 grams of KNO; how many grams of potassium can you extract from it?
Mass of Potassium : 116.1 g
Further explanationGiven
38.7% potassium in Potassium nitrate
300 g of KNO3
Required
mass of potassium
Solution
%mass of element = (mass of an element in 1 mole of compound/mass of 1 mole compound) x 100%
mass of K(potassium) in 300 g KNO3 :
= 38.7% x 300 g
= 116.1 g
Fill in the coefficient needed to make the equation balanced.
1. _______ Na + Cl2 → ______NaCl
a. 2, 2
b. 2, 3
c. 2, 1
d. 2, 4
2. _______Al + _______S → Al2S3
a. 2, 2
b. 2, 3
c. 2, 4
d. 2, 6
3. ______ H2 + O2 → ______H2O
A. 2, 2
b. 2, 3
c. 2, 4
d. 2, 8
4. _______Fe + ______O2 → ______Fe2O3
a. 4, 2, 2
b. 4, 2, 1
c. 4, 3, 2
d. 4, 3, 1
Answer:
1 a
2 b
3 a
4. c
Explanation:
What is the volume, in liters, of a 0.2 M solution containing 8.5 grams of AgNO3?
Answer:
The volume of a 0.2 M solution containing 8.5 grams of AgNO₃ is 0.25 L
Explanation:
Molarity (M) is a common way of expressing the concentration of solutions. It is defined as the number of moles of solute per volume of solution. The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Being the molar mass of AgNO3 169.87 g / mol, then you can apply the following rule of three: if 169.87 grams are present in 1 mole of the compound, 8.5 grams will be present in how many moles?
[tex]amount of moles=\frac{8.5 grams*1 mole}{169.87 grams}[/tex]
amount of moles= 0.05
So, being the molarity equal to 0.2 M, replacing in the definition of molarity:
[tex]0.2 M=\frac{0.05 moles}{volume}[/tex]
and solving you get:
[tex]volume=\frac{0.05 moles}{0.2 M}[/tex]
volume=0.25 L
The volume of a 0.2 M solution containing 8.5 grams of AgNO₃ is 0.25 L
Is the study of matter and energy complete, or do you think there’s still new information to discover?
Answer:
Physical science, in turn, can be divided into chemistry and physics. Chemistry is the study of matter and energy at the scale of atoms and molecules. ... Physics is the study of matter and energy at all scales—from the tiniest particles of matter to the entire universe but i dont really know if there is new information to discover
Explanation:
hope it help and if it doesnt sorry ;)
Determine the density (in g/mL) of a substance with a mass of 105 g and a volume of 17.6 mL.
Answer:
Density, d = 5.96 g/mL
Explanation:
Given that,
Mass, m = 105 g
Volume, V = 17.6 mL
We need to find the density of the substance. So,
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{105\ g}{17.6\ mL}\\\\d=5.96\ g/mL[/tex]
So, the density of the substance is 5.96 g/mL.
6. Describe nuclear fusion reactions as they
occur in the sun.
Answer:
i wish i know
Explanation:
i wish i know
Help pls!!!!!!!!!!!!!!!!!!!
Answer:
water
Explanation:
water is made up of both hydrogen and oxygen (h2o)