Answer:
Explanation:
It changes from a liquid to a solid. This change occurred due to the change in temperature. As the mixture cooled, the molecules condensed and the mixture formed a solid shape.Which formed the jelly.
Draw the major product for the reaction of 1-butyne with water in the presence of catalytic TfOH (i.e., CF3SO3H). Then answer the additional question regarding this transformation.
Answer:
2-Butanone
Explanation:
From the given information:
The presence of mercury as an acid catalyst brings about the addition of water to the triple bond which yields enol. Then, according to Markownikov's rule and after tautomerism has occurred, we have a methyl ketone ( 2- Butanone) as the product.
The answer regarding the transformation is addition and hydration.
A percent composition analysis yields 52% carbon (C), 13% hydrogen (H), and 35% oxygen (O). What is the empirical formula for the compound?
Answer:
[tex]C_2H_3O[/tex]
Explanation:
Hello!
In this case, since the percent composition analysis provide the by-mass percent of each atom in the molecule, we can assume we have 52 g of carbon, 13 g of hydrogen and 35 g of oxygen, so we are able to compute the moles based on their atomic masses:
[tex]n_C=\frac{52g}{12.01g/mol} =4.33\\\\n_H=\frac{13g}{2.02g/mol}=6.44\\\\n_O=\frac{35g}{16.00g/mol}=2.19[/tex]
Now we divide all the moles by those of oxygen as the fewest ones in order to obtain their subscripts in the empirical formula:
[tex]C=\frac{4.33}{2.19} =2.0\\\\H=\frac{6.44}{2.19} =3.0\\\\O=\frac{2.19}{2.19} =1[/tex]
Thus, the empirical formula is:
[tex]C_2H_3O[/tex]
Best regards!
Answer:
c2h6o
Explanation:
explain why we do not see this side product. write the reaction that removes side product as its formed
Answer:
See explanation
Explanation:
Looking at the structure of the starting material, we can see that the carbocation intermediate is a tertiary carbocation.
The tertary carbocation is very stable. Indeed, it is the most stable carbocation intermediate. As such, none of this other product is obtained due to this intermediate.
The mechanism of this reaction is shown in the image attached to this answer.
Name some acidic and alkaline substances that you use at home
Answer: write anything given below in the diagram except for the neutral substances
Explanation:
Answer:
Alkaline
1 drain cleaner
2 oven cleaner
3 baking soda
4 drain unblocker
Acid
1 drain cleaner
2 bowl cleaner
3 house bleach
4 diluted soap
What is the overall charge of an atom with 18 protons, 18 neutrons, and 19 electrons?
Answer:
as no. of protons is equals to the no. of electrons so, it is a neutral atom.
but, as Atomic No. = Mass No. - No. of neutrons
Atomic No. = No. of protons = 18
so, Mass No. = Atomic No. + No. of Neutrons= 18 + 20 = 38
so, correct option is C.
Explanation:
Calculate the mass of butane needed to produce 97.4 g of carbon dioxide. Express your answer to three significant figures and include the appropriate units. g
Answer:
32.1 g
Explanation:
Step 1: Write the balanced combustion reaction
C₄H₁₀ + 6.5 O₂ ⇒ 4 CO₂ + 5 H₂O
Step 2: Calculate the moles corresponding to 97.4 g of CO₂
The molar mass of CO₂ is 44.01 g/mol.
97.4 g × 1 mol/44.01 g = 2.21 mol
Step 3: Calculate the moles of butane that produced 2.21 moles of carbon dioxide
The molar ratio of C₄H₁₀ to CO₂ is 1:4. The moles of C₄H₁₀ required are 1/4 × 2.21 mol = 0.553 mol
Step 4: Calculate the mass corresponding to 0.553 moles of C₄H₁₀
The molar mass of C₄H₁₀ is 58.12 g/mol.
0.553 mol × 58.12 g/mol = 32.1 g
What kind of ions does metal form?
* ionic bond
* covalent bond
* anions
* cations
* melting point
* boiling point
conductivity
* Polyatomic Ions
* Valence electron
* Metal
* Nonmetal
* Metaloids
Answer:
Option D: Cations
Explanation:
Do you need only one answer .
22.17 grams of Mercury (II) Nitrate, Hg(NO3)2, reacts with an excess of Potassium, K.
How many grams of Mercury is formed.
Hg(NO3)2 + 2 K = 2 KNO3 + Hg
Answer:
Mass = 14.0 g
Explanation:
Given data:
Mass of mercury nitrate = 22.17 g
Mass of mercury formed = ?
Solution:
Chemical equation:
Hg(NO₃)₂ + 2K → 2KNO₃ + Hg
Number of moles of mercury nitrate:
Number of moles = mass/molar mass
Number of moles = 22.17 g / 324.6 g/mol
Number of moles = 0.07 mol
Now we will compare the moles of Hg(NO₃)₂ and mercury.
Hg(NO₃)₂ : Hg
1 : 1
0.07 : 0.07
Mass of mercury:
Mass = number of moles × molar mass
Mass = 0.07 mol × 200.6 g/mol
Mass = 14.0 g
Approximately 13.70 grams of mercury (Hg) will be formed in the reaction.
Calculating the molar masses of the reactants and products in the balanced chemical equation and using stoichiometry will give us the mercury mass.
[tex]Hg(NO_{3})_2[/tex] molar mass:
Mercury (Hg) weighs 200.59 g/mol.
Nitrogen (N) weighs 14.01 g/mol.
O (oxygen) weighs 16.00 g/mol.
Since[tex]Hg(NO_{3})_{2}[/tex] has two nitrate ions ([tex]NO_{3}[/tex]), we double the molar mass of [tex]NO_{3}[/tex] (62.00 g/mol) by 2.
The molar mass of [tex]Hg(NO_{3})_2[/tex] is 324.61 g/mol: 200.59 g/mol + 2(14.01 g/mol + 3(16.00 g/mol)) = 200.59 g/mol + 2(48.00 g/mol) = 200.59 + 2(62.01 g/mol) = 200.59 + 124.02 = 324.61.
From the balanced equation, Hg(NO3)2 and Hg have a 1:1 molar ratio. Hg(NO3)2 creates one mole of Hg.
Calculate [tex]Hg(NO_{3})_2[/tex]moles:
22.17 g [tex]Hg(NO_{3})_2[/tex]
22.17 g/324.61 g/mol = 0.0682 mol.
Hg forms 0.0682 mol due to the 1:1 molar ratio.
Hg mass:
Hg's mass is 0.0682 mol × 200.59 g/mol = 13.70 g.
The process will produce 13.70 grammes of mercury (Hg).
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I need the answer please
All composites are made up of two main components, a ________ and ___________.
Answer:
Matrix and Fibre.
Explanation:
The two main components composites are made up of are matrix and fibre. The matrix is the base material while the fiber is what reinforces the material.
Question 3
Which organism in a food web does not get its energy from other organisms?
A. decomposer
O
B. producer
O
C. primary consumer
D. secondary consumer
O
Hi there!
[tex]\large\boxed{\text{B. Producer}}[/tex]
The only organisms in a food web that do not get energy from other organisms are producers. These are autotrophs (ex: plants or phytoplankton) that use photosynthesis to produce energy. This means that these organisms only intake water and sunlight rather than nutrients from other organisms (consumers).
Where are valence electrons located in an atom?
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom.
Answer: The outermost shell
Explanation:
Valence electrons are located in the outermost shell of the atom, or the energy level as it is also known.
A person has a mass of 70.0 kg on Earth,
what would their mass be on the Moon,
which has 1/6 the gravity of Earth?
A. more than on the Earth
B. less than on the Earth
C. the same as on Earth
An unknown element X has the following isotopes: ²⁵X (80.5% abundant) and ²⁷X (19.5% abundant). What is the average atomic mass in amu of X?
Answer:
25.39
Explanation:
Given parameters:
Abundance of X-25 = 80.5%
Abundance of X - 27 = 19.5%
Unknown:
Average atomic mass of X = ?
Solution:
The average atomic mass of X can be derived using the expression below:
Average atomic mass = (abundance x mass of X - 25) + (abundance x mass of X - 27)
Average atomic mass = (80.5% x 25) + (19.5% x 27) = 25.39
Please for the love of jesus help. );
Identify the molecule containing the least oxygen atoms.
A) 12.044 × 10^23 molecules of CO2.
B) 12 g of O3.
C) 0.1 mol of V2O5.
D) 10 mL of H2O.
I am one of the elements. I am a metal that can form a cation. My atomic number is Z. My atomic radius is smaller than the atomic radius of the element Z-1 but is larger than the atomic radius for Z-2. Of the two elements in my group that have biological importance, I am the one with lower atomic mass. Who am I
Answer:
Beryllium
Explanation:
From the information given: Beryllium has the ability to form a monoatomic divalent metal cation. The atomic number (Z) is 4 and the mass number is 9. The atomic element of (Z-1) is Li and that of (Z-2) is He. The elements they are referring to that share the same similar biological importance within Beryllium are Magnesium and Calcium because they are in the same group.
The atomic radii of He = 140
The atomic radii of Li = 182; &
The atomic radii of Be = 153 pm
Given the balanced equation 2C+ 3H2
Answer:
Explanation:
The answer is (4) 4.0 mol. This is a stoichiometry problem. You start with 2.0 mol of C2H6 and obtain the moles of C by multiplying 2.0 by the mole ratio, in this case 2. 2.0*2=4.0mol.
Out of the given four mixtures, the one that appears clear and transparent is:
a) Chalk powder and water
b) Sand and water
c) Starch and water
d) Sugar and water
Answer:
d) Sugar and water
Explanation:
The sugar and water solution will have a clear and transparent outlook.
When we look at a solution of a mixture of sugar and water, it a homogenous one.
A homogenous solution have their solution in one phase.
The solute is sugar and the solvent is water.
The solution obtained is colorless therefore, light will pass through without any obstruction.
The other solutions will be translucent or opaque
26. Which statements would be expected to be true for Organesson (Og)? Select all that apply.
A It is relatively unreactive.
B. It has a high electron affinity.
C. It has a full valence shell of electrons.
D. It has the largest atomic radius of the four new elements.
E. It has the lowest effective nuclear charge of the four new elements.
The central charge is another name for the effective nuclear charge that an electron experiences.. It has the lowest effective nuclear charge of the four new elements.
What is element ?An element is a type of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei.
Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules. The oxidation number of the atom can be used to calculate the strength of the nuclear charge.
The metals and non-metals are the other two basic categories into which the elements may be separated. Metals are frequently bright, malleable, and carry electricity.
All living and non-living things are made up of elements, which are fundamental building blocks. They serve as the universe's center. Elements make up every particle, no matter how little or large. Our body is composed of five main components are Calcium, Carbon, Hydrogen, Oxygen, and Nitrogen
Thus, option E is correct.
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When the concentration of A in the reaction A ..... B was changed from 1.20 M to 0.60 M, the half-life increased from 2.0 min to 4.0 min at 25°C. Calculate the order of the reaction and the rate constant.
Answer:
2
[tex]0.4167\ \text{M}^{-1}\text{min}^{-1}[/tex]
Explanation:
Half-life
[tex]{t_{1/2}}A=2\ \text{min}[/tex]
[tex]{t_{1/2}}B=4\ \text{min}[/tex]
Concentration
[tex]{[A]_0}_A=1.2\ \text{M}[/tex]
[tex]{[A]_0}_B=0.6\ \text{M}[/tex]
We have the relation
[tex]t_{1/2}\propto \dfrac{1}{[A]_0^{n-1}}[/tex]
So
[tex]\dfrac{{t_{1/2}}_A}{{t_{1/2}}_B}=\left(\dfrac{{[A]_0}_B}{{[A]_0}_A}\right)^{n-1}\\\Rightarrow \dfrac{2}{4}=\left(\dfrac{0.6}{1.2}\right)^{n-1}\\\Rightarrow \dfrac{1}{2}=\left(\dfrac{1}{2}\right)^{n-1}[/tex]
Comparing the exponents we get
[tex]1=n-1\\\Rightarrow n=2[/tex]
The order of the reaction is 2.
[tex]t_{1/2}=\dfrac{1}{k[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{t_{1/2}[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{2\times 1.2^{2-1}}\\\Rightarrow k=0.4167\ \text{M}^{-1}\text{min}^{-1}[/tex]
The rate constant is [tex]0.4167\ \text{M}^{-1}\text{min}^{-1}[/tex]
Label the diagram by placing the names on the correct positions on the picture.
Label the diagram by placing the names on the correct positions on the picture.
Answer:
Show diagram so we can see
Explanation:
How many atoms in 3.6 g of lead (Pb) ? image attached , will give brainliest
Answer:
1.05 x 10²²atoms
Explanation:
Given parameters:
Mass of Pb = 3.6g
Unknown:
Number of atoms in Pb = ?
Solution:
Some very essential constants;
1 mole of a substance contains 6.02 x 10²³atoms/mole
Molar mass of Pb = 207.2g/mol
First, we convert the mass to number of moles then to number of atoms.
Number of moles = [tex]\frac{mass(g)}{number of moles(g/mol)}[/tex]
3.6g x [tex]\frac{1}{207.2}[/tex] x [tex]\frac{g}{g/mol}[/tex] x 6.02 x 10²³ x [tex]\frac{atoms}{mole}[/tex] = 1.05 x 10²²atoms
After 3 half lifes go by, there are 26g of Sodium-24 left. The parent sample of Sodium-24 is
grams.
NUMBERS ONLY FOR THIS ANSWER
Blank 1:
Answer:
208 grams
Explanation:
Half life is the time it takes for a sample to reduce to half it's initial concentration.
In this question, 3 half lives go by. This is given as;
Let original mass be represented by x
First Half life;
Starting mass = X
Remaining mass = X/2
Second Half life;
Starting mass = X/2
Remaining mass = (X/2) / 2 = x/4
Third Half life;
Starting mass = X/4
Remaining mass = (X/4) / 2 = X/8
Since 26g was left, it means;
X/8 = 26
X = 26 * 8 = 208 grams
Environmental Science-JMajors-GEO-220029.001: Mastery Assess It_2 5. Most of the concentration of which gas results from the activity of producer organisms?
Answer: Oxygen
Explanation:
Producer organisms include plants and algae and refer to organisms that are able to produce their own food by synthesizing it from inorganic matter. This is what plants and algae are able to do through the process of photosynthesis.
During photosynthesis, these organisms produce food for themselves and in doing so produce oxygen as a by-product. This is what contributes mostly to the concentration of oxygen in the atmosphere.
When you go to the doctor for an illness, the doctor asks you how you feel. You describe all your symptoms. Then, the doctor makes hypotheses about which organ system is having problems.
Drag each set of complaints below to the organ system most likely to be having problems.
stomach ache,
gassy,
no appetite
sneezing all the time
, runny nose,
trouble breathing,
coughing
having a very hard time remembering people's names,
feeling sad and anxious
seem to be catching every disease that comes around, taking a long time to get a better Respiratory system
Nervous system
Immune system
Digestive system
Answer:
1. Digestive system.
2. Respiratory system
3. Nervous system
4. Immune system
Explanation:
When you go to the doctor for an illness, the doctor asks you how you feel. You describe all your symptoms. Then, the doctor makes hypotheses about which organ system is having problems.
1. Digestive system: stomach ache, gassy, no appetite.
2. Respiratory system: sneezing all the time, runny nose, trouble breathing, coughing.
3. Nervous system: having a very hard time remembering people's names, feeling sad and anxious.
4. Immune system: seem to be catching every disease that comes around, taking a long time to get a better
14. A pediatric vitamin drug product contains the equivalent of 0.25 mg of fluoride ion in each milliliter. How many milligrams of fluoride ion would be provided by a dropper that delivers 0.6 mL
Answer:
[tex]m=0.15mg[/tex]
Explanation:
Hello!
In this case, since the concentration of the fluoride ion in the vitamin drug product is:
[tex]0.25\frac{mg}{mL}[/tex]
Now, since the used volume of product was 0.6 mL, the following grams are going to be present:
[tex]m=0.25\frac{mg}{mL}*0.6mL \\\\m=0.15mg[/tex]
Best regards!
1. What does the atomic number of an element represent? What does the mass number of an
atom represent?
Identify each layer of Earth as a solid or a liquid.
crust
mantle
outer core
inner core
How can u change cm to dm
Suppose a molecule with six electron groups is confined to two dimensions and has a hexagonal planar electron geometry. A molecule with six electron groups arranged in a hexagonal planar geometry. The top and bottom groups are labeled 1 and 4, respectively. The two groups next to 1 are labeled 2 and the two groups next to 4 are labeled 3. If two of the six groups are lone pairs, where would they located?
Answer:
Above and below the plane of a square
Explanation:
The number of electron groups often determine the shape of a molecule. When we have a coordination number of six, one of the possible arrangement of groups is the hexagonal planar geometry. In this arrangement, six electron groups are arranged in the same plane.
If two among the groups are replaced by lone pairs, the substituents will arrange themselves at the corners of a square while the lone pairs will be found above and below the plane of the square. This is the square planar geometry.
The two lone pairs will be located at the top and at the bottom of the plane.
The VSEPR theory is a model that helps to predict the shape of a molecule based on the repulsions associated with the electron groups on the central atom.
Given that a hexagonal planar electron geometry possibly has 6 electron groups. The description of how the electron groups are arranged can be seen in the first image below.
If two of the six groups are lone pairs, we know that lone pairs repel each other. As such, in this arrangement, the lone pairs will occpy the opposite direction which is the top and the bottom of the plane in order to have minimum repulsion as possible.
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