Answer: False
Explanation: False. Replication. The process of DNA copying itself begins when the two sides of the DNA molecule unwind and " separate ".
4. Two bulbs have a resistance of 20 ohms when working normally. They are placed in a series
circuit whey they operate normally. What is the combined resistance of the two bulbs?
(1 Point)
22 ohms
20 ohms
10 ohms
40 ohms
Answer:
R = 40 ohms
Explanation:
Two bulbs have a resistance of 20 ohms when working normally.
When they are placed in series, the combined resistance is given by :
R = R₁ + R₂
We have, R₁ = R₂ = 20 ohms
R = 20 +20
= 40 ohms
Hence, the combined resistance of the two bulbs is 40 ohms.
why is the sky orange and red at sunset
At sunset the light from the sun grazes across the surface of the earth, passing through a long column or pathlength of atmosphere. During its passage through the atmosphere the blue components of the light are reduced in intensity, making the transmitted beam of sunlight more yellow or even red in color.
hope this helps ^^
Answer:
Here ya go ;)
Small particles of dust and pollution in the air can contribute to (and sometimes even enhance) these colors, but the primary cause of a blue sky and orange/red sunsets or sunrises is scattering by the gas molecules that make up our atmosphere. ... In this way, clouds act as a screen on which nature's colors are painted.
Which property of metals makes them good conductors of heat
Answer:
the molecules are tightly bound together, making it easy for electric currents to jump from one molecule to the next.
Explanation:
Answer:
They are good conductors of thermal energy because their delocalised electrons transfer energy. The close packing of the metal ions in the lattice. the delocalised electrons can carry kinetic energy through the lattice.
Explanation:
The isotope 38Sr 90 is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 yrs. Calculate the half-life.
Answer:
Half-life = 28.8 years
Explanation:
The radioactive decay of an atom follows the equation:
Ln[A] = -kt + ln[A]₀
Where [A] is actual amount of isotope after time t; k is decay constant and [A]₀ initial amount of isotope
Solving for k:
Ln[0.393g] = -k*10yrs + ln[0.500]
-0.2408 = -k*10yrs
0.02408yrs⁻¹ = k
Half-life, is:
Half-life = ln 2 / k
Half-life = ln 2 / 0.02408yrs⁻¹
Half-life = 28.8 years
The isotope [tex]38Sr^{90}[/tex] is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 yrs, the half-life is - 28.78
Formula:
radioactive decay follows first-order kinetics,
k = [tex]\frac{1}{t}ln\frac{a}{x}[/tex]
Given:
a = initial amount = 0.5 g
x = amount of isomer after 10 years = 0.393 g
t= time = 10 years
Solution:
k = [tex]\frac{1}{10}ln\frac{0.5}{0.393}[/tex]
= 0.02408
k = [tex]\frac{0.693}{t/2}[/tex]
T(1/2) = half-life time
= [tex]\frac{0.693}{k}[/tex]
= [tex]\frac{0.693}{0.02408}[/tex]
= 28.78 years.
Thus, The isotope [tex]38Sr^{90}[/tex] is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 yrs, the half-life is - 28.78
Learn more:
https://brainly.com/question/1160651
Explain why air is a good conductor of heat
Answer:
Hope it helps!
Explanation:
Air molecules are too far to disperse heat energy to one another efficiently. Heat is conducted by molecules and atoms that are very closely bonded together and vibrating at high frequency.
A sample of water contains 5.24x10^22 molecules. How many moles are in this sample?
Answer:
0.087 moles of water
Explanation:
Given data:
Number of molecules of water = 5.24×10²² molecules
Number of moles of water = ?
Solution:
The given problem will solve by using Avogadro number.
1 mole = 6.022 × 10²³ molecules of water
5.24×10²² molecules × 1 mol / 6.022 × 10²³ molecules
0.87×10⁻¹ mol
0.087 mol
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
HELP ASAP I WILL GIVE BRAINLIEST
Which gas property in the chart above is extensive and cannot be used to identify the gas?
Specific heat of 0.98 J/g·°C
Density is 0.5 g/mL
Volume of 12.7 mL
Boils at -223°C
Answer
Boils at -223 degree C
Explanation:
Because gas doesn't have any boiling points
HELP ME PLEASE: The image at the left shows three stars in the constellation Orion: Betelgeuse (A), Mintaka (B), and Rigel (C). How do the appearances of stars A, B, and C compare?
Answer:
B and C look blue therefore they are hot but A and C look big
The appearance of the three stars is compared by their colors and sizes.
In the image you can see the stars of the constellation Orion.
The star Betelgeuse (A) looks yellow and large (perhaps because of its closeness).The star Mintaka (B) is small (perhaps further away) and blue in color.The star Rigel (C) looks big and blue.According to the above, it can be inferred that the three stars differ in their colors and sizes. Their colors can be determined by the chemical composition of them, while their sizes by the distance that separates them from the Earth, making the farthest ones look smaller and the closest ones, bigger.
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Vaccination _____.
is always effective in preventing disease
provides passive immunity against disease
involves injecting the body with specific medication
should be given on a regular schedule from birth
(({Multiple choice for my review but NOT THE ANSWER FOR THIS QUESTION:
provides a type of adaptive immunity
injects a weakened or inactive form of a virus into the body
must be given on a regular basis from birth to 18 years of age.
People with my review please note that it doesn't have to be given on a regular basis. I grew up just fine without one every so often.}))
If two stars had equal absolute brightness, what else would most likely be equal?
O energy
O distance from Earth
O apparent magnitude
o chemical composition
help please time timed
Answer:
C - apparent magnitude
Explanation:
How can you increase an object's kinetic energy?
How many Chorine atoms should bond with one Aluminum atom?
Answer:
three chlorine atoms
Explanation:
Which of the following is an example of a mixture?
A. Ca
B. CO2 + H2 + O2
C. NaCl
D. C6H12O6
The first one to help me will get the brainliest and 50 points UwU
Answer:
B is because their not combined
Answer:
tru it's B
Explanation:
give the person above me brainliest if u want
How do you decide which conversion factor to use?
Answer:
When a conversion is necessary, the appropriate conversion factor to an equal value must be used. For example, to convert inches to feet, the appropriate conversion value is 12 inches equal 1 foot. To convert minutes to hours, the appropriate conversion value is 60 minutes equal 1 hour
Explanation:
hope this helps have a good night/day :) ❤
What would happen to the universe if the Law of
Conservation of Matter were not upheld? If it
wasn't actually a thing?
define the term "filtration"
Answer:
the action or process of filtering something. hope this helps :D
Ari dissolves 1 gram of sugar in 10 grams of water. What will be the mass of the dissolved sugar and water ? Explain your answer.
Answer:
the answer would be 11 grams of water/sugar water
Explanation: its that because 11 grams plus 1 gram = 11 grams
even though it may seem it may just go away that mass has to go somewhere it just doesn't vanish from the earth.
Which manufacturing process is shown in the photograph?
O A. Forming
B. Combining
C. Conditioning
D. Separating
Answer:
c
Explanation:
to multiply food with the help of a simple machine
Answer:
Explanation:
Inclined Plane: Easy Lifting. An inclined plane is simply an even, sloping surface. ...
Wedge: Splitting and Separating. ...
Screw: Fastening and Moving. ...
Lever: Multiplying Force. ...
Wheel and Axle: Rolling. ...
Pulley: Hoisting Heavy Loads. ...
Scissors: Making the Cut. ...
Hand Truck: Mover's Friend.
A small portion of the periodic table of the elements is reproduced here showing eight elements and the groups to which they belong.
Based on its position on the periodic table, which column of elements would be most likely to chemically combine with lithium in 2:1 ratio?
it is 2.1 that it is his w ga hshshwu
How does a thermometer measure temperature?
Please write down the definitions of elements, compounds, mixtures, homogenous mixtures, and heterogenous mixtures.
For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?
reactants: 1; products: 1
reactants: 1; products: 2
reactants: 2; products: 1
reactants: 2; products: 2
Answer:
The balanced chemical reaction is written as follows:
bacl2 + na2so4 → baso4 + 2nacl
Therefore, the number of chlorine atoms in the reactants side and the products side would be 2 atoms in both sides which should be the case because the number of atoms in each side should have the same number.
Explanation:
Internet
Help me with this one please
Single replacement/displacement
Further explanationGiven
Type involves free element
Required
Type of reaction
Solution
Single replacement/displacement occurs when a more active element replaces another less active element in the compound to form a new compound
The activity of this element can be seen from the voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the element is more reactive (easily release electrons) and the stronger reducing agent
The general formula for single replacement :
A + BC ⇒ AC + B
From this general formula shows that there are 2 free elements on both sides (reactants and products)
18 gram of sucrose is dissolved in 180 gram of water. Calculate the number of oxygen atoms in the solution.
answer: 6.684×10^24
We know, molecular mass of sucrose is 342 g/mol.
So, number of moles in 18 g is :
[tex]n_1 = \dfrac{342\ g/mol}{18\ g}\\\\n_1 = 0.053 \ moles[/tex]
Also, number of moles of water is :
[tex]n_2 = \dfrac{180}{18} \\\\n_2 = 10 \ moles[/tex]
We know, 1 mole of sucrose contain 11 moles of oxygen.
So,
[tex]n' = 0.053\times 11\\\\n'= 0.583\ moles[/tex]
1 mole of water contain 1 mole of oxygen .
So, moles of oxygen in water are :
[tex]n'' = 10\ moles[/tex]
Total number of moles, [tex]n' + n'' = 10.583 \ moles[/tex] .
Number of oxygen atoms are :
[tex]N = 6.022 \times 10^{23}\times 10.583\\\\N = 6.37 \times 10^{24}[/tex]
Hence, this is the required solution.
The student carried out three titrations. The results are shown below (pic)
Use the student's concordant results (those within 0.10 cm of each other)
to work out the mean volume of sulfuric acid added.
Answer:
yes
Explanation:
Hydrogen ions _____.
are hydrogen atoms which have lost protons
are released by bases
have positive charges
have negative charges
are hydrogen atoms which have lost protons
help plzzzzzzzzzzzzzzz
Answer:
Blue is the metal Metals react by losing electrons from the outermost shell, which means their outermost electrons and now closer to the nucleus (one shell lower) and thus they get smaller when you go from metal atom to metal ion.
Explanation:
The law of conservation of matter states that matter is neither created nor destroyed in a chemical reaction. Which of the following must be true? *
A the mass of the products is greater than the mass of the reactants
B the mass of the products is less than the mass of the reactants
C the mass of the reactants must equal the mass of the products
Answer:
A
Explanation:
When heat from the sun turns water into water vapor this is called?
A) condensation
B) runoff
C) precipitation
D) evaporation