Answer: A = atomic number = 12
Explanation: A (atomic number) defines the chemical element. It is the numbervof protons or electrons. Neutron numbers may vary, produving isotopes of differing atomic mass. This isotope has atomic mass 28. The atomic number 12 = carbon. C28 does not really exist. If it could be produced it would be radioactive with an almost zero halflife.
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:
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.
In the sodium-potassium pump, sodium ion release causes two K ions to be released into the cell. __________________ True False
Answer:
false
Explanation:
As we know that in sodium-potassium pump .
sodium potassium move 3Na+ outside the cells
and moving 2k+ inside the cells
so that we can say that given statement is false
Answer FALSE
1. What does the atomic number of an element represent? What does the mass number of an
atom represent?
HELP BRAINLIEST Question 18
How many moles are in 20.0 g of CaCl2?
Link to Periodic Table of the Elements
0.180 mol
110.98 mol
5.55 mol
0.265 mol
Answer:
0.18mol
Explanation:
Given parameters:
Mass of CaCl₂ = 20g
Unknown:
Number of moles = ?
Solution:
To solve this problem;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CaCl₂ = 40 + 2(35.5) = 111g/mol
Number of moles = [tex]\frac{20}{111}[/tex] = 0.18mol
Identify each layer of Earth as a solid or a liquid.
crust
mantle
outer core
inner core
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:
Discuss the importance of Icaming social anthropology for university students
Answer:
what is the importance of anthropology as a student?
Social anthropology plays a central role in an era when global understanding and recognition of diverse ways of seeing the world are of critical social, political and economic importance. Social anthropology uses practical methods to investigate philosophical problems about the nature of human life in society.
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.
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
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!!!)
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.
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
please answer right need today not hard
Answer:
A
Explanation:
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 moles are present in 16 grams of carbon dioxide?
Answer:
n = 0.36 mol
Explanation:
We need to find number of moles present in 16 grams of carbon dioxide.
Let there are n number pf moles,
n = given mass/molecular mass
The molecular mass of carbon dioxide = 44 g/mol
So,
[tex]n=\dfrac{16\ g}{44\ g/mol}\\\\n=0.36\ \text{mol}[/tex]
So, there are 0.36 moles in 16 grams of carbon dioxide.
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.
how much does a 22 lb child weigh in kilograms?
Answer:
48 kg
Explanation:
1 kilogram = 2.2 pounds
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
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.
2. Phosphorus has an atomic number of 15, atomic mass of 31 and has a charge of -3. How many protons does Phosphorus has
Answer:
15
Explanation:
since atomic number=proton number so phosphorus has as proton number 15
Answer:
6.2
Explanation:
4. If the density of seawater at a depth of 10,000 m is 1.071 g/mL and a 25.0 g sample of water from that depth contains 99.7 mg K , what is the molarity of potassium ions in the sample
Answer:
0.11 M.
Explanation:
Hello!
In this case, since the molarity is computed as the moles of solute divided by the volume of solution in L, we first need to compute the moles of potassium in 99.7 mg as shown below:
[tex]n_K=99.7mgK*\frac{1gK}{1000mgK} *\frac{1molK}{39.1gK}=0.00255molK[/tex]
Moreover, given the density of the seawater (mixture containing the K and other solutes), we can compute the liters as shown below:
[tex]V=25.0g*\frac{1mL}{1.071g}*\frac{1L}{1000mL}=0.0233L[/tex]
Therefore, the molarity turns out:
[tex]M=\frac{0.00255mol}{0.0233L}\\\\M=0.11M[/tex]
Best regards!
I need the answer please
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.
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:
HELP ILL MARK BRAINLIEST PLS
Chemical compounds
A.
can be made up of a combination of different elements.
B.
are always made up of several atoms with the same number of protons.
C.
are always made up of one type of element and one type of atom.
D.
can be made up of one atom with several different elements in it.
Answer:
a.
can be made up of a combination of different elements.
Which option shows the correct conversion of units from 3 L to mL?
3 L ∙ 100 mL1 L
3 L ∙ 1,000 mL1 L
3 L ∙ 1 mL100 L
3 L ∙ 1 mL1,000 L
Answer:
345
Explanation:
Which of the following products would be counted in a countries GDP?
Answer:
consumption, investment, government consumption, and gross investment, and net exports.
Explanation:
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
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 person standing waist-deep in a swimming pool may appear to have shorter legs then they actually have because of which process?
1. Refraction
2. Absorption
3. Diffraction
4. Reflection
Answer: Refraction
Explanation: i took the test
