Answer: Organic acids form when a carboxyl group (−COOH) is substituted for one of the hydrogen atoms in a hydrocarbon.
how does this data provide evidence for base pairing in dna
Answer:
There are chemical cross-links between the two strands in DNA, formed by pairs of bases. They always pair up in a particular way, called complementary base pairing: thymine pairs with adenine (T–A) guanine pairs with cytosine (G–C)
Explanation:
Hope it helps u
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.Which best describes the structure of 2-butene?
A. a four-carbon hydrocarbon with a double bond between the second and third carbon atoms
B. a four-carbon hydrocarbon with a branching point at the second carbon atom in the chain
C. a four-carbon hydrocarbon with a double bond between the first and second carbon atoms
Answer:
A.
Explanation:
The 2 - butene is an alkene with the formula C4H8, which can be used as the polybutene monomer or co-polymer. It is a compressed liquefied gas colorless, highly flammable characteristic odor. Prolonged exposure to this gas can cause frostbite causing a lowering of consciousness. Its formula is C4H8 and it is made up of 4 carbon atoms.
The best structure that describes 2-butene is that of Option A.
DUE TONIGHT!
I need help doing this question and please type an ACTUAL answer. I don’t want none of that “aNsWeR iN FiLe”. Thank you!
Calculate the specific heat (Cp) for indium metal given a 1.0 mole absorbs 53.0 J
while increasing in temperature from 297.5K to 299.5K.
Answer:
27J/Kmol
Explanation:
Heat = number of moles times the Moeller heat capacity chimes the change in temperature.
^ Q = nC△T
^ C = Q/ n△T = +53J / (1mol) (299.5K - 297.5K)
^ = 26.5 (rounded to 27)
What is the specific heat of ethanol if 4650 j are required to raise the temperature of 250.0g of ethanol from 22.0oc to 29.6 degrees Celsius
Answer:
[tex]C=2.45\frac{J}{g\°C}[/tex]
Explanation:
Hello there!
In this case, since the thermodynamic definition of heat in terms of mass, specific heat and temperatures is given by:
[tex]Q=mC(T_2-T_1)[/tex]
We are to calculate the specific heat of the ethanol as shown below:
[tex]C=\frac{Q}{m(T_2-T_1)}[/tex]
Thus, by plugging it the given data we can obtain:
[tex]C=\frac{4650J}{250.0g(29.6-22.00\°C)} \\\\C=2.45\frac{J}{g\°C}[/tex]
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Evidence of a chemical change would be
A) melting
B) spinning top
C) spilled bucket of water
D)rusting car fender
WHAT IS THE PH OF LEMON JUICE IF IT HAS A HYDROGEN ION CONCENTRATION [AT]ON[H^ + ]=5.0*10^ -2 M.
Can somebody help me please !!!!!!
Answer:
ph=2
Explanation:
Which substance is the BEST example of a compound?
Orange Juice
Salt Water
Hydrogen
Water
Answer:
I think hydrogen because Hydrogen combined with one atom with oxygen and in hydrogen peroxide. It has two atoms of hydrogen and 2 atoms of oxygen. Therfore it should be a compound.
How many moles does 21.7 L of gas at STP represent?
Answer:
The number of moles represented by 21.7 L is 0.96875 moles
Explanation:
The volume occupied by one mole of a gas which consists of (approximately) 6.022 × 10²³ elementary at STP is 22.4 L. The volume is known as the molar volume of gas
Therefore, the number of moles, 'n', present in 21.7 L of gas at STP is given as follows;
The number of moles represented by 22.4 L = 1 mole
∴ The number of moles represented by 21.7 L = 1 mole/22.4 L × 21.7 L = 0.96875 moles
The number of moles represented by 21.7 L = 0.96875 moles.
what are the chemical symbols of the particles found in the calcium chloride crystal (lattice)
Answer:
Formula and structure: The chemical formula of calcium chloride is CaCl2, and its molar mass is 110.983 g/mol. It is an ionic compound consisting of the calcium cation (Ca2+) and two chlorine anions (Cl-). The bivalent calcium metal forms an ionic bond with two chlorine atoms, as shown below.
Based on the ionic nature of calcium chloride, the chemical symbols of the particles found in the calcium chloride crystal is Ca²⁺ and Cl⁻.
What are ionic compounds?
Ionic compounds are compounds which are composed of ions.
Calcium chloride is an ionic compound composed of the ions, calcium ions and chloride ions.
The chemical formula of calcium chloride is CaCl2, and its molar mass is 110.983 g/mol.
The symbol for calcium ion is Ca²⁺
The symbol for chloride ion is Cl⁻.
Therefore, the chemical symbols of the particles found in the calcium chloride crystal is Ca²⁺ and Cl⁻.
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How does every single cell in the body get the substances it needs to carry out the chemical reaction that provides it energy?
PLEASE HELP!!
Which statement describes the first step in soil formation?
A: Small, simple plants begin to grow.
B: Parent rock breaks into smaller pieces.
C: Humus begins to mix with sediment.
D: Organic material starts decomposing.
Answer:
B: Parent rock breaks into smaller pieces.
Explanation:
Weathering the first step in the process of soil formation. The process of breaking up off the parent rocks into simple forms, is termed as weathering. The formation of soil is a very gradual and slow process. It takes millions of years for the rocks to become soil. The dead and decaying matter of plants and animals are also included in the rocks. Water, sun, climatic conditions and rain are some of the factors that effect weathering.
Answer:
32
Explanation:
I found it
What is the name of the element represented in the model?
O A. Beryllium
B. Boron
O C. Oxygen
O D. Flourine
Answer:
Your answer is B
Boron
Good luck
Explanation:
What volume of a 40.0 % by volume acetone solution can be
made with 20.0 mL of acetone?
Answer:
50 milliliters of acetone solution
Explanation:
If a solution is 40% by volume of acetone, then we have 40 mL of acetone in a 100 mL solution. So if we have 20 mL of acetone, we get: 100 mL solution 40 mL ( CH3) 2CO⋅
20mL (CH3) 2CO =50mL solution
The volume percent of 40% indicates that 40 ml of acetone is present in 100 ml solution. Then, 20 ml acetone can be made into 50 ml solution.
What is volume percentage ?Volume percentage is a common term used to express the concentration of a solution. Volume percentage of a solution is the ratio of the volume of the solute to the volume of the solvent multiplied by 100.
The volume percentage of the solution measures how much volume of the solute is present in 100 ml of the solution. Thus a 50% by volume solution is 50 ml solute in 100 ml solution.
Given that volume percentage of acetone = 40%.
that is 40 ml of acetone is present in 100 ml of the solution.
Therefore, the volume of the solution containing 20 ml of acetone is :
(20 × 100)/40 = 50 ml.
Therefore, 50 ml of 40% by volume o solution can be made by 20 ml of acetone.
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Science please help. I will add you and please don’t give me any random websites
Answer:
C
Explanation:
Answer:
D)
Explanation:
On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.
How many mililiters are there in a .5 M solution in which 60 grams of Li?
Answer:
10
Explanation:
how many grams of chromium are needed to react with of cuso4 to produce 10.2g cu
Answer:
14.7 g of chromium
Explanation:
determining the molecular formula of a hydrocarbon with a relative molecular mass of 54
Answer:
C₄H₆
Explanation:
A hydrocarbon is a molecule that only contains atoms of Carbon and Hydrogen. As you remember, the molar mass of Carbon is 12g/mol and the molar mass of Hydrogen is 1g/mol.
To solve this question we can find the amount of Carbons necessary that doesn't exceed the 54g/mol. That is:
54g/mol / 12g/mol = 4.5
As the molecular formula must be given in whole numbers, the amount of Carbons is 4. This 4 carbons have a mass of:
12g/mol*4 = 48g/mol
And the hydrogens necessaries to suply the molecular mass are:
54 - 48 = 6 hydrogens
That means molecular formula is:
C₄H₆How to know the state of elements in a reaction
Answer:
each compound or molecule is indicated in subscript next to the compound by an abbreviation in parentheses. For example, a compound in the gas state would be indicated by (g), solid (s), liquid (l), and aqueous (aq).
Explanation:
can someone do this for me i wasent there when we learned it
2Fe(OH)3 Fe2O3+3H2O how many grams of Fe2O3 are produced if 10.7 grams of Fe (OH)3 react in this way
Answer: 7.98 grams of [tex]Fe_2O_3[/tex] are produced if 10.7 grams of [tex]Fe(OH)_3[/tex] are reacted.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Putting values in equation 1, we get:
[tex]\text{Moles of} Fe(OH)_3=\frac{10.7g}{106.87g/mol}=0.100mol[/tex]
The chemical equation for the reaction is
[tex]2Fe(OH)_3\rightarrow Fe_2O_3+3H_2O[/tex]
By Stoichiometry of the reaction:
2 moles of [tex]Fe(OH)_3[/tex] produce = 1 mole of [tex]Fe_2O_3[/tex]
So, 0.100 moles of [tex]Fe(OH)_3[/tex] produce= [tex]\frac{1}{2}\times 0.100=0.05mol[/tex] of [tex]Fe_2O_3[/tex]
Mass of [tex]Fe_2O_3[/tex] =[tex]moles\times {\text{Molar Mass}}=0.05mol\times 159.69g/mol=7.98g[/tex]
Hence 7.98 grams of [tex]Fe_2O_3[/tex] are produced if 10.7 grams of [tex]Fe(OH)_3[/tex] are reacted.
The heart works directly with which
Liver
Lungs
Kidneys
Brain
Answer:
Lungs.
Explanation:
They bring the blood throughout the body, to help it function properly
A sample of Xe gas is observed to effuse through a pourous barrier in 4.83 minutes. Under the same conditions, the same number of moles of an unknown gas requires 2.29 minutes to effuse through the same barrier.
The molar mass of the unknown gas is
_____ g/mol.
Answer:
28.93 g/mol
Explanation:
This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]
We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.
Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.
[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]
The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.
[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]
[tex]{\frac{M2}{131} } = (0.47)^2[/tex]
[tex]{\frac{M2}{131} } = 0.22[/tex]
M2= 0.22 x 131
M2= 28.93 g/mol
what is the difference between isotopes and allotrope not more than three line
Answer:
An allotrope is one way that atoms can be arranged in a solid. An isotope is one way that protons and neutrons can form the same atomic element.
2. Energy that is stored in an object because of its temperature is called ___________________. *
Answer:
Thermal Energy
Explanation:
The thermal energy of an object increases as the temperature increases, causing atoms and molecules to move faster. When the temperature decreases, the thermal energy decreases, causing atoms and molecules to move slower. Another term for thermal energy is heat energy.
What is the density of a block of wood with a volume of 16.5 ml and mass of 6.39g?
Answer:
0.38
Explanation:
The formula for finding density is mass/volume. So the equation becomes 6.39/16.5 which gives you 0.38
Which of the following groups of chemical elements would you expect to
be most alike in their physical and chemical properties?
A. Chromium, rhodium, zinc, silicon
B. Magnesium, strontium, radium, barium
C. Lithium, beryllium, boron, oxygen
D. Sulfur, selenium, chlorine, krypton
Answer: B. Magnesium, strontium, radium, barium
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Magnesium (Mg) , Strontium (Sr) , Radium (Ra) and Barium (Ba) are elements which belong to Group 2. They have 12, 38, 88 and 56 electrons respectively and contain 2 valence electrons each and need one electron to complete their octet.
The chemical reactivity of elements is governed by the valence electrons present in the element and thus they are alike in physical and chemical properties.
You have 1 1/2 moles of 1 kg bottles of O2. What is the mass of O2 that you have?
A. 9.033x10^23 kg
B. 9.033x10^23 atoms
C. 1.80x10^27 kg
D. 1.806x10^24 moles
It is not B as I have already tried it :(
Answer:
A: 9.033 × 10^(23) kg
Explanation:
According to avogadro's number, we know that;
1 mole = 6.022 × 10^(23) kg
Thus;
1½(1.5) mole of O2 will produce;
(1.5 × 6.022 × 10^(23))/1 = 9.033 × 10^(23) kg
Looking at the options, the correct one is Option A.
How many atoms are in 14 moles of I? Watch your significant figures.
A. 8.4 x 10^24 atoms of l
B. 8.43 x 10^24 moles of l
C. 8.4 x 10^23 atoms of I
D. 8.43 atoms of l
Answer:
8.43 x 1024 moles of I
Explanation:
Which reaction occurs when equivalent quantities of H" (or H30) and OH" are mixed?
1.
oxidation
2.
reduction
3
hydrolysis
4.
neutralization
Answer: A reaction which occurs when equivalent quantities of H" (or [tex]H_{3}O^{+}[/tex]) and OH" are mixed is a neutralization reaction.
Explanation:
When acid and base chemically combine together to form sat and water then it is know as neutralization reaction.
An acidic substance gives hydrogen ions [tex](H^{+})[/tex] on dissociation and a basic substance gives hydroxide ions [tex](OH^{-})[/tex] on dissociation.
For example, [tex]H^{+} + OH^{-} \rightarrow H_{2}O[/tex] is a neutralization reaction where an acid and base are mixed together to form water.
No salt is formed as because here the reactants are not present as compounds.
In a hydrolysis reaction, water molecule(s) is added to the reactant molecules.
For example, [tex]CH_{3}COOCH_{3} + H_2O \rightarrow CH_{3}COOH + CH_{3}OH[/tex]
Oxidation is the process of addition of oxygen to a molecule and removal of hydrogen.
Reduction is the process of addition of hydrogen in a compound and the removal of oxygen atom.
Therefore, we can conclude that reaction which occurs when equivalent quantities of H" (or [tex]H_{3}O^{+}[/tex]) and OH" are mixed is a neutralization reaction.
1. Friction acts in a direction
to the
direction of an object's motion.
a. unrelated
b. opposite
c. equal
d. perpendicular
Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.
What is Friction?Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.
Friction can be described as a force that is dependent on external factors. Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.
Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.
The force of friction acts in the opposite direction to the direction of an object's motion.
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