Answer:
Double helix
Explanation:
Its like two starcaises intertwined.
Answer:
D
Explanation:
D is the answer had to find out the harder way
Tommy told the class that his science fair project proved that drinking three cans of soda each day will make you taller. Tommy explained that he measured his height at the beginning of the experiment and then drank three sodas each day for the next four weeks. At the end of the four weeks Tommy claimed he had grown 10 centimeters. What is needed to show that Tommy’s findings are valid?
his experiment being printed in a science journal
his procedure being reviewed by a group of his peers
his procedure being repeated with the same or similar outcome
his procedure read by scientists not involved in the experiment
Answer:
his procedure being repeated with the same or similar outcome
Explanation:
For findings to be valid, they must be reproducible. Thus, if others perform the same experiment and they get the same results, then soda might increase your height.
It's like if I claim that by saying bloody mary 3 times in mirror and I saw the ghost. For this to be valid, you and other need to do it and see if you do indeed see the ghost.
A gas has a volume of 72.1 liters at 58.3 atm. The final volume is 101.0L, what is the new pressure?
Answer:
X is an element in period 3 with two electrons in the outer shell
Because it is a polar molecule, water has _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Answer: Cohesion
Explanation: Because cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another.
Water waves in the sea are observed to have a wavelength of 300 m and a frequency of 0. 07 hz. The speed of these waves is:
The speed of water waves in the sea, which have wavelength 300 m is 21 m/s.
What is speed?
Speed is the distance travelled by an object in per unit time.
Given that, the wavelength of the waves is 300 m
The frequency of the waves is 0.07 hz
To find the speed
By the formula of speed
Speed = frequency × Wavelength
Putting the value in the equation
Speed = 300 × 0.07 = 21
Thus, the speed of these waves is 21 m/s
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What final product is formed when thorium-230 undergoes a series of two alpha (α) emissions?
The result of two alpha decay of Thorium 230 is Radon-222.
What is alpha decay?
The radioactive decay results in the release of the subatomic particles resulting in reduction in the mass number by 4, and the atomic number by 2.
The result of alpha decay of thorium 230 is given as:
First decay:[tex]\rm ^{230}_{90}Th\;\rightarrow\;^{226}_{88}Ra\;+\;^{4}_{2}\alpha[/tex]
Second decay:[tex]\rm ^{226}_{88}Ra\;\rightarrow\;^{222}_{86}Rn\;+\;^{4}_{2}\alpha[/tex]
The result of two alpha decay of Thorium 230 is Radon-222.
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A 1.0 g mixture of magnesium chloride and sodium nitrate is dissolved in water. then an excess of silver nitrate solution is added and a precipitate is collected and dried. the mass of the precipitate is 1.43 g. what is the percentage of magnesium chloride in the original mixture
The percentage of magnesium chloride in the original mixture is 25.529 %.
What is silver nitrate?Silver nitrate is an organic compound. It is used in treating wounds and infection of the skin.
A 1.0 g mixture of magnesium chloride and sodium nitrate.
The mass of the precipitate is 1.43 g.
Thus, the percentage of magnesium chloride in the original mixture is 25.529 %.
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importance achievements of chemistry
Answer:
Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy and clear air, water and soilChemistry helps you to understand the world around you Chemistry is a heart of cooking A command of chemistry can keep you safeSome important achievements of chemistry includes discovery of oxygen ;Atomic Theory; Atoms Combine Into Molecules ;Synthesis of Urea; Chemical Structure ; Periodic Table of the Elements; Electricity Transforms Chemicals ; The Electron etc.
Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.
There are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry ,industrial chemistry , pharmaceutical chemistry.
Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care. The reasons for people to pursue discoveries in chemistry because it is the most important part of daily life and related to the human health too.
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The complete question
Mention some important achievements of chemistry
Propose a reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 m ethyl 1 pentyne
A reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is proposed below.
What is synthesis reaction?The artificial execution of chemical reactions to obtain one or more products is known as chemical synthesis.
Physical and chemical manipulations, usually involving one or more reactions, are used to achieve this. The procedure is repeatable and reliable in current laboratory settings.Synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is shown in the image.
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What is a chemical bond?
A. When electrons are shared between atoms
B. When protons are shared between atoms
D. When neutrons are shared between atoms
Determine the molar concentration of cl- ions in a 1. 00 m solution of agcl2- with no excess silver ions
The molar concentration of Cl⁻ ions in a 1. 00 m solution of AgCl₂ with no excess silver ions is 0.020M.
How do we determine the molar concentration?Molar concentration of Chloride ions present in the silver chloride solution will be calculated by using the formation constant equation as:
Kf = [AgCl₂] / [Ag²⁺][Cl⁻]²
For AgCl₂ value of Kf is 2.5×10⁵.
Chemical reaction with ICE table is:
Ag²⁺(aq) + 2Cl⁻(aq) → AgCl₂
Initial: 0 0 1
Change: +x +2x -x
Equilibrium: x 2x 1-x
On putting all the values on the Kf equation, we get
2.5×10⁵ = (1-x) / (x)(2x)²
x is negligible as compared to 1 so the term 1-x becomes 1,
2.5×10⁵ = 1 / 4x³
x = 9.97 × 10⁻³ M
Concentration of chloride ions = 2x = 2(9.97 × 10⁻³) = 0.020M.
Hence the molar concentration of chloride ions is 0.020M.
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SEP math! Each day, the average person's
kidneys filter around 200 quarts of blood.
About 2 quarts of urine is produced in the
process. How many quarts of blood will the
average person's kidneys filter in one year?
How many quarts of urine will the average
Derson's kidneys produce in the same amount
of time?
Answer:
Quarts of blood = 72000
Quarts of urine = 720
Explanation:
Given;Each day, the average person'skidneys filter around 200 quarts of blood.About 2 quarts of urine is produced in theprocess. To Find;In one year the average person's kidney filter quarts of blood and quarts of urine.Here, we know that
1 year = 365 days
For blood
200 × 365 = 72000
For urine
2 × 365 = 720
Thus, The average person's kidney filters 72000 quarts of blood and 720 quarts of urine.
A solution is made by dissolving 50. g of ethyl alcohol in 336 g of water. what is the percent by mass of ethyl alcohol in the solution? (round your answer to 2 sig figs)
Answer:
13 %
Explanation:
(50 g) / (50 + 336 g) = .1295 or 13 %
When a strong acid such as hcl is added to the carbonic acid buffer system, _________
When a strong acid such as HCl is added to the carbonic acid buffer system, more carbonic acid is formed.
What is a buffer system?A buffer system prevent the pH change and resist it when an acid or base is added to the solution.
A buffer system is prepared by weak acid or weak base and their salts. There are three types of buffer system present.
Carbonic acid bufferPlasma protein bufferPhosphate bufferThus, the correct option is b. More carbonic acid is formed.
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is the earth getting hotter
[OH-] = 9.8 x 10^-11M
Is this acidic or basic?
Answer:
Acidic
Explanation:
pOH = - log (9.8 x 10^-11)
pOH = 10
pOH + pH = 14
pH = 14-10
pH = 4
Anything below pH of 7 is acidic.
PLEASE HELP!!
What is the activation energy of this reaction?
50 kJ
100 kJ
150 kJ
200 kJ
Answer:
50 kJ
Explanation:
Activation energy is the energy to go from reactants at 150 to 200 kJ
= 50 kJ
Question 1-6
What is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?
1. 0.029 molal
c. 0.11 molal
b. 29 molal
d. 1.1 x 10 4 molal
Answer:
Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent.
Water is an amphoteric substance, meaning it can serve as both an acid and a base,
True
False
Answer:
given statement is completely true
e.g . water H2O
Answer:
True
Explanation:
Water is amphoteric, which means it can act as both a Braonsted-Lowry acid and a Bronsted-Lowry base. Strong acids and bases ionize completely in aqueous solution, while weak acids and bases ionize only partially. The conjugate base of a Brønsted-Lowry acid is the species formed after an acid donates a proton.
What is a solution?
A. A mixture in which the parts are chemically combined
a
B. Any combination of a liquid and a solid
C. A liquid that contains solid particles unevenly distributed
throughout it
D. A mixture that has the same composition throughout
Answer:
A !!
it a mix where everything is combined together
What would be the properties of the 5th state of matter? (bosse-instein condensate)
Answer:
a state of matter created when particles, called bosons, are cooled to near absolute zero (-273.15 degrees Celsius, or -460 degrees Fahrenheit).
Explanation:
hope this helps
pls mark brainliest
rank the following pressures from highest to lowest a)736 mmHg b)0.928 atm c
)1.12*10^5 Pa d)728 torr
The rank of the pressure from highest to lowest are c, 1.22 x 10⁵ Pa < a, 736 mm hg < b, 0.928 < d, 728 torrs.
What is pressure?The force applied perpendicular to any object is the pressure.
First, we convert all the quantities into atm.
1. 1 mmHg = 0.00131579atm/mmHg
736mmHg = 0.96843 atm
2. 1 torr = 0.00131578947 atm/ torr
728 torr = 0.9579 atm
3. 1 pascal = 9.87 x 10⁻⁶
1.12 x 00000pa = 1.105 atm
So given value in atm are-a) 96843 atm b) 0.98atm c) 0.9579 aim d) 1105 atm.
SO, the order will be c<a< b<d.
Thus, the order will be c<a<b<d.
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Yeast and sugar were added to lukewarm water and place in a flask. a balloon was stretched over the opening of the flask. small bubbles were observed rising along the side of the flask as the balloon slowly began to inflate. it can conclude that ...
Answer:
Bubbles indicate change
Explanation:
i don't know if i'm right but if im not its fine
Hope it helps<3
- How many grams of nitrogen (N2) are needed to react with 435.2 g of oxygen (02) in the following equation?
N2 + O2 → 2NO
N2= 28.02
02= 32
Explanation:
I think the answer is this for a better check mass- mass ratio in stoichiometry lesson
Identify the atom below.
a.) H
b.) He
c.) Bе
d.) С
If I have Oxygen gas at a pressure of 36.0 kPa, a volume of 38 L, and a temperature of 82 °C, how many moles of gas do I have? (Equation: K= 273+C),
PV=nRT
O 0.50 moles
O 0.40 moles
O 0.60 moles
O 0.46 moles
Answer:
.46 moles
Explanation:
PV = n RT make sure you use the correct R = 8.31446 L-kPa/(K-mol)
36 * 38 = n * 8.31446 * (273.15 + 82)
n = .463 moles
100 POINTS!!
Based on what we have learned match the correct items with their counterparts.
Answer:
I beileve it is NORTH KOREA!! XD actually D.
Explanation:
If I have 5.00g of solid CO₂ that is allowed to sublimate (turn to gas) in an empty balloon. How many moles of CO₂ are present in the balloon? If the gas has a temperature of 293. K at a pressure of 0.995 atm, what is the volume of the gas in the balloon?
56g is the coreect acsnw
How many moles of solute are in 125 mL of a 2.0 M hydrochloric acid (HCI) solution?
if answer 1 point . plsss fast daddddy
[tex]\sf\large \green{\underbrace{\red{Answer⋆}}}:[/tex]
0.250 moles
Explanation:
First we will convert quantity of solution into liters
[tex] \implies \sf 125 \: ml \times {10}^{ - 3} = 0.125 \: l[/tex]
Now we will use morality formula
[tex] \sf molarity = \frac{no \: of \: moles}{volume} \\ \\ \sf no \: of \: moles = molarity \times volume[/tex]
Here volume(quantity) = 0.125 l
AND no. of moles(given) = 2.0M
[tex] \sf \implies no \: of \: moles = 2 \times 0.125 \\ \\ \sf \implies no \: of \: moles = 0.250 \: moles \: of \: HCl[/tex]
[tex]~~~~~~w = \dfrac{SVM}{1000}\\\\\\\implies nM = \dfrac{SVM}{1000}\\\\\\\implies n= \dfrac{SV}{1000}\\\\\\\implies n = \dfrac{125 ~ \text{mL}\times 2.0~ \text{M}}{1000}\\\\\\\implies n = \dfrac{250}{1000}\\\\\\\implies n = 0.25~ \text{mol.}\\\\\text{The number of moles is 0.25.}[/tex]
True or false. Wet objects allow electricity to pass through them easily
Answer:
true
Explanation:
Because water has a ability to flow electricity through it
Can I get help in #5 ?
a. pressure increases
Gay Lussac's Law
When the volume constant, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
