Answer:
40.5% is abundance of X-122
Explanation:
we know there are two naturally occurring isotopes of X, X-120 and X-122.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 122
1-x for isotopes having mass 12 0
The average atomic mass of X is 120.81 amu
we will use the following equation,
122x + 120 (1-x) = 120.81
122x + 120 - 120x = 120.81
122x- 120x = 120.81 -120
2x = 0.81
x= 0.81/2
x= 0.405
0.405 × 100 = 40.5%
40.5% is abundance of X-122 because we solve the fraction x.
now we will calculate the abundance of X-120.
(1-x)
1 - 0.405 = 0.595
0.595 × 100 = 59.5 %
59.5 % for X-120.
Identify each layer of Earth as a solid or a liquid.
crust
mantle
outer core
inner core
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!
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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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.
what is 4.50+3.4+12.09 ?
Answer:
19.99
Explanation:
The steps are what I did, so no need to do it the exact same!
1. Add 4.50 and 3.4
4.50 + 3.4 = 7.9
2. Add 7.9 and 12.09
7.9 + 12.09 = 19.99
Hope this helps!
Answer:
The answer to this equation is 19.99. If you round the number, it is 20.
Explanation:
4.50
3.40 (0 as a place holder)
+ 12.09
-------------------
19.99 because . . .
4.5 + 3.4 = 7.9
7.9 + 12.09 = 19.99.
19.99 ≅ 20.00 or 20 (IF YOU NEED TO ROUND IT, IF NOT, IT IS JUST 19.99!!!)
I need the answer please
If I use warm water on my plants then they will grow faster as hot water increases metabolism this is an example of
Answer:
The options are
A. a hypothesis
B. a theory
C. a research question
D. a scientific explanation
The answer is A. a hypothesis
Explanation:
A hypothesis is referred to as a brief explanation on the occurrence of an event.
In the example above using of warm water on plants was inferred to make it grow faster as hot water increases the metabolism.
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
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.
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
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:
1. What does the atomic number of an element represent? What does the mass number of an
atom represent?
Type the correct answer in the box. Spell all words correctly.
What forms the backbone of a DNA strand?
A DNA molecule is made up of building blocks known as nucleotides. Each nucleotide consists of deoxyribose, a phosphate group, and one of the chemical bases. The nucleotides join together to form a _______
, which form the backbone of a DNA strand.
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:
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:
Which orbital diagram represents nitrogen (atomic number = 7 )
Answer:
Option A
Explanation:
The choice A accurately specifies and illustrates the orbital diagram of a Nitrogen atom with 7 electrons.
Based on the number of electrons in a Nitrogen atom, there are two energy levels, the s and p sub-levels:
Nitrogen = 2, 5
The first energy level, S will take up two electrons with opposite spin.
The second energy level will have 5 electrons in an S and P orbital.
Configuration 1 is correct because, it satisfies the premise that half and fully filled orbitals are also stable.
A solution of 100.0 mL of 0.200 M KOH is mixed with a solution of 200.0 mL of 0.150 M NiSO4. (a) Write the balanced chemical equation for the reaction that occurs. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
Answer:
2KOH(aq) + NiSO₂(aq) → K₂SO₄(aq) + NiOH₂(s)
Explanation:
This reaction is an example of a double-replacement reaction where the cations of two compounds exchange with its anions. In the reaction:
KOH(aq) + NiSO₄(aq)
There are produced K₂SO₄ and NiOH₂ salts (The last one is insoluble, its state is (s) but K₂SO₄ is very soluble, its state is (aq). The unbalanced reaction is:
KOH(aq) + NiSO₄(aq) → K₂SO₄(aq) + NiOH₂(s)
To balance the potassiums:
2KOH(aq) + NiSO₂(aq) → K₂SO₄(aq) + NiOH₂(s)And now, the reaction is balanced
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
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.
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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Which of the following products would be counted in a countries GDP?
Answer:
consumption, investment, government consumption, and gross investment, and net exports.
Explanation:
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 .
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.
Describe and explain how molecules of oxygen behave when the temperature is so low that the oxygen becomes a liquid. ( This is science )
Please tell me
Answer/Explanation: Oxygen becomes liquid at -183°C.
Liquid nitrogen has a lower boiling point at −196 °C (77 K) than oxygen's −183 °C (90 K), and vessels containing liquid nitrogen can condense oxygen from air.
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
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
how much does a 22 lb child weigh in kilograms?
Answer:
48 kg
Explanation:
1 kilogram = 2.2 pounds
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
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
