Answer:
scientist never ignore the missing -parts of body
Explanation:
they take the missing bones as an opportunity to look into them as practical for pre medical student ,they are very costly sealed
Elements can be described by various properties, and identified by their boiling and melting points. For example, gold melts at 1,064ºC and boils at 2,856ºC. Does boiling point depend on the mass present?
A. No; chemical properties stay the same regardless of mass.
B. No; physical properties stay the same regardless of mass.
C. Yes; physical properties can change when mass increases or decreases.
D. No; qualitative properties like boiling point stay the same regardless of mass.
Answer:
Explanation:
Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.
If a string of Christmas lights goes out entirely when one light bulb burns out, the bulbs are connected in parallel with each other.
True
or
False
Answer:
False
Explanation:
A series circuit is one that is all connected
Write the word and balanced chemical equations for the reaction between:
Magnesium and oxygen
Word equation
Magnesium + Oxygen = Magnesium oxide
Symbolic equation
Mg + O2 = MgO
Balanced symbolic equation
2Mg + O2 = 2MgO
What material was added to powdered rock during tuttle and bowen's experiments?
Answer:
water was added to powdered rock
Explanation:
High solubility of ammonia in water what type of interaction is responsible for?
Answer:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
Answer:
Hydrogen Bonding
Explanation:
The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).
true or false amino acids and nucleic acids are both monomers containing nitrogen
Answer:
Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.
Explanation:
Amino acids and nucleic acids are both monomers containing nitrogen is a true statement as both monomers have nitrogen in them.
There are four major macromolecules that are used by the body of an organism that helps in getting energy and growth and development of the organism.
1. The building blocks of DNA or nucleic acid are nucleotides:
consist of the sugar deoxyribose, a phosphate group, and one of four nitrogenous basesNitrogenous bases are adenine (A), guanine (G), cytosine (C), and thymine (T) or Uracil (U).Uracil is present in RNA onlyThese nitrogenous bases have nitrogen in their structure2. Amino acids are the building blocks of proteins:
An amino acid is an organic molecule with 3 componentsmainly consist of the Amino group (-NH2) which means nitrogen.an acidic carboxyl group (−COOH),an organic R groupThus, the correct answer is - true.
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What is the primary intermolecular force the exist between molecules of carbon tetrachloride?
Answer:
Carbon tetrachloride is non-polar and so the only kind of force that can exist is induced dipole.
Given the following unbalanced equation:
Mg +
02-
Mgo
If you want to make 47 moles of Mgo, how many moles of Mg do you need?
C3H8+5O2 --> 3CO2 + 4H2O
If you start with 434 g O2
1. How many grams of C3H8 are needed?
2. How many grams of CO2 form?
3. How many grams of H2O form ?
please show work
Answer:
3, 4 ,1
Explanation:
Of the three intermolecular forces, the type
with the largest dissociation energy is
Answer:
Strongest intermolecular force
Hydrogen Bonding (H-Bonding)
Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen, and are the strongest intermolecular force.
Hydrogen bonds have the largest dissociation energy.
What is hydrogen bond?Hydrogen bond is formed when hydrogen is attached to some electronegative elements like O, N and F.
What is dissociation energy?The dissociation energy is the energy required to break a bond and form two atomic or molecular fragments, each with one electron of the shared pair.
Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen and are the strongest intermolecular force.
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(EASY POINTS!!!!!!!!!!!!!!!)How do we change the world... one random act of kindness at a time
Answer:
less polution
Explanation:
7. Put the following elements in order from smallest to largest atomic radius and explain
why:
C.0, Sn, Sr
Answer:
O, C, Sn, Sr
Explanation:
As per the periodic table trends, atomic radius of an atom deceases from left to right and increases down a group this is so because across a period or from left to right, number of protons increases that increases the nuclear charge and nuclear radius decreases. Down the group, atomic radius increases because energy level increases and distance between nucleus and outermost orbital increases.
The elements in order from smallest to largest atomic radius are:
O, C, Sn, Sr because as per the periodic table trends, oxygen (O) fall into right side of Carbon (C) in the periodic table and Strontium (Sn) and Tin (Sn) fall into down the group where Tin (Sn) is on the right side of Strontium (Sn).
Hence, the correct order is "O, C, Sn, Sr".
Give an example of an element which was named as honour to a scientist!!
Explanation:
1) Einsteinium
2) Albert Einstein
Answer:
Einsteinium, Rutherfordium, Nobelium, Curium etc are some examples of elements named after scientists
When a molecule is separated into its components parts it form
A. Componds
B. Atoms
C. Protons
D. Ions
When a molecule is separated into its components it forms atoms as molecules are made up of same or different kind of atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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After mixing equal amounts of the two molecules, the solution achieved equilibrium at 25 ∘ C . 25 ∘C. The concentration at equilibrium of glucose 1‑phosphate is 0.01 M, 0.01 M, and the concentration at equilibrium of glucose 6‑phosphate is 0.19 M. 0.19 M. Calculate the equilibrium constant, K eq , Keq, and the standard free energy change, Δ G ∘ , ΔG∘, of the reaction mixture.
Answer:
Keq = 19
ΔG° = -7.3kJ/mol
Explanation:
Based on the chemical reaction:
Glucose 1-phosphate ⇄ Glucose 6-phosphate
The equilibrium constant, Keq is defined as:
Keq = [Glucose 6-phosphate] / [Glucose 1-phosphate]
Where [] are equilibrium concentrations of each substance
Replacing:
Keq = [0.19M] / [0.01M]
Keq = 19
Now, standard free energy change, ΔG° is defined as:
ΔG° = -RT ln K
Where R is gas constant 8.314J/molK
T is absolute temperature (25°C + 273.15K = 298.15K)
and K is equilibrium constant = 19
Replacing:
ΔG° = -8.314J/molK*298.15K ln 19
ΔG° = -7299J/mol
ΔG° = -7.3kJ/mol
URGENT!
(a) A gas' pressure is 765 torr at 296k. At what temperature will the pressure be 560. torr?
(b) Which gas law is being represented above?
Boyle's Law, Charle's Law, Gay-Lussac's Law?
Answer !BOTH! questions.
Answer:
GAY-LUSSAC'S LAW.
Explanation:
P1 = 765 torr
T1 = 23°C = 296K
P2 = 560. torr
T2 = ?
(765 torr)/(296K) = (560. torr)/ T2
T2 = 226 K = -57°C
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore the new temperature is -57°C. the law that is used over here is Gay-Lussac's Law.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Ideal gas is only for ideal gas.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
P1 = 765 torr
T1 = 23°C = 296K
P2 = 560. torr
T2 = ?
Applying Gay-Lussac's Law
(765 torr)/(296K) = (560. torr)/ T2
T2 = 226 K = -57°C
Therefore the new temperature is -57°C. the law that is used over here is Gay-Lussac's Law.
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True or false: An atom’s valence electrons are those electrons that have the highest energy.
Answer:
False
Explanation:
Valence electrons depend of their what group they're in.
Answer: false
Explanation:
Because I looked it up
explain Alexander Volta law
Answer:
Alessandro Giuseppe Antonio Anastasio Volta (Italian: [alesˈsandro ˈvɔlta]; 18 February 1745 – 5 March 1827) was an Italian physicist, chemist, and pioneer of electricity and power[2][3][4] who is credited as the inventor of the electric battery and the discoverer of methane. He invented the Voltaic pile in 1799, and reported the results of his experiments in 1800 in a two-part letter to the President of the Royal Society
Which environmental conditions contribute most to the spread of bacteria?
O A. cold temperatures and low humidity
B. warm temperatures and low humidity
oc, cold temperatures and high humidity
O
D. warm temperatures and high humidity
Analyses of mutations show they only result in variations in?
Answer:
Genetic variation
Explanation:
measure of the genetic differences that exist within a population.
PLEASEEE HELP ME
Sulfuric acid is the most produced industrial chemical in the world. The chemical process involves many steps – the final step combines oleum (H2S2O7) with water to produce sulfuric acid (H2SO4). For the first batch of acid production, 1.20 kilograms of oleum is reacted with excess water, and 435 grams of sulfuric acid are produced.
• Write the balanced equation for the formation of sulfuric acid from oleum and water.
• Calculate the theoretical yield of sulfuric acid. Work must be shown to earn credit.
• Calculate the percent yield for the sulfuric acid production. Work must be shown to earn credit
Answer:
Balanced equation: H₂S₂O₇ + H₂O → 2H₂SO₄
Theoretical yield of H₂SO₄: 1322 g
Percent yield for the H₂SO₄ production: 33%
Explanation:
First of all, we determine the balanced equation:
H₂S₂O₇ + H₂O → 2H₂SO₄
Stoichiometry says that 1 mol of oleum reacts to 1 mol of water in order to produce 2 moles of sulfuric acid.
1.20 kg = 1200 g
We convert the grams to moles → 1200 g . 1mol/ 178.12g = 6.74 mol
Ratio is 1:2, so if we have 6.74 mol of oleum we can produce the double of moles of acid. (6.74 . 2) = 13.48 moles of acid.
This is the 100 % yield reaction, or it can be called theoretical yield.
We convert the moles to mass → 13.48 mol . 98g /1mol = 1322 g of acid may be produced.
In the problem, they said we produced 435 g of acid, so let's determine the percent yield.
Percent yield of reaction = (Produced yield / Theoretical yield) . 100
Percent yield of reaction = (435 / 1322) . 100 → 33 %
What were some of the limitations of Bohr's atomic model?
Answer:
bohr didn't mention abt sub shells that are in main shells
5. What is the charge of an atom that has lost four electrons? *
Answer:
+4
Explanation:
An atom is considered to be neutral before losing or gaining any electrons. They are neutral in charge because they initially have the same number of protons (with charge of +1 each) and electrons (with a charge of -1 each).
Consider charge in an electron like a balance, with positively charged protons on one side and negatively charged electrons on the other. When you have the same number of each, there is equal amounts of positive and negative charge so the atom is neutral with a charge of zero.
For example, potassium has 19 protons, and 19 electrons. This means it has
19 positive charges and 19 negative charges. If you take away one electron, it now has 19 positive charges and 18 negative charges. So there is one more positive charge than negative, which means it is now an ion (a charged atom) with a charge of +1. If you take away two electrons the charge becomes +2... 4 electrons the charge becomes +4.
describe Transpiration
Answer:
is the process of water movement through a plant and its evaporation from aerial parts, such as leaves stems and flowers.
Answer:
well in easy terms... its just like the loss of water from the leaves or other parts of a plant due to evaporation
Explanation:
Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism.
hello, if you can please help!
Answer:
A: False
Explanation:
B: True
C: part of earths mantle.
Convert 714 years to min using Dimensional Analysis
Answer:
We know (by definition) that: 1 yr ≈ 525948.77 min.
We can set up a proportion to solve for the number of minutes.
1 yr / 714 yr ≈ 525948.77 min / x min
Now, we cross multiply to solve for our unknown x:
x min ≈ (714 yr / 1 yr) * 525948.77 min → x min ≈ 375527421.78000003 min
Conclusion:
714 yr ≈ 375527421.78000003 min
Explanation:
Hope it is helpful....
[tex]714 \: y \times \frac{12 \: months}{1 \: years} \times \frac{30.417 \: days}{1 \: month}[/tex]
[tex] = 260612.856 \: days[/tex]
[tex]260612.856 \: days \times \frac{24 \: h}{1 \: day} \times \frac{60 \: min}{1 \: h}[/tex]
[tex] = 375282512.6 \: minutes[/tex]
describe the relationship between kinetic energy and mass
Answer:
Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. ... Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass
HELP!!!! question 2!!!
Answer:
ionic bonding
Explanation:
In ionic bonding, electrons are completely transferred from one atom to another.
Answer:Ionic bond
Explanation:
Ionic bond involves a complete transfer of electron. For eg. in NaCl, Na gives one of its electron to Cl.
Given 35.0 grams of aluminum at 22.0 °C. What will be the final temperature of the Al if 300.0 joules of heat energy is added to the Al? (The specific heat of Al is 0.217 cal/g°C)
An atom has the following electron configuration . 1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2 How many valence electrons does this atom have ?
2
3
5
11
The correct answer is 2.
Valence electrons are the electrons present in the outermost shell of the atom.
Given electronic configuration:-
[tex]1s^{2} 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2[/tex]
From the above electronic configuration, the outermost shell is the fourth shell that is [tex]4s^ 2[/tex]. The number of electrons in this shell is 2.
Hence, the atom has 2 valence electrons.
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