Answer:
Atoms have a central nucleus with positively charged protons and neutral neutrons; negatively charged electrons circle the nucleus. The electrons that are involved in chemical bonding are those electrons in the outermost orbit, referred to as valence electrons.
Explanation:
Chemical bond refers to the way in which atom bond with each other
What is chemical bond?A chemical bond is a form of attraction or bond that exist between atoms, ions or molecules. This bond allows the formation of chemical compounds.
The bond can be as a result of electrostatic force of attraction.
Therefore, Chemical bond refers to the way in which atom bond with each other
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What is the charge of an electron?
A-negative
B-neutral
C-positive
D-none of these
Homeostasis refers to what in regards to living organisms?
Question 4 options:
The chemical processes maintaining balance within the living organism
The way an organism makes food
The organisms Home status
The way an organism captures and uses energy
Ni
Answer:
I think that the answer is B or a
Explanation:
The recommended dally allowance (RDA) of selenium in your diet is 55 micrograms. how many atoms of selenium is this?
Answer: 4.19 x 10^17 atoms Se
Answer:
4.2 × 10¹⁷ atoms of Se
Explanation:
Step 1: Convert the mass to grams
We will use the conversion factor 1 g = 10⁶ μg.
55 μg × 1 g/10⁶ μg = 5.5 × 10⁻⁵ g
Step 2: Calculate the moles corresponding to 5.5 × 10⁻⁵ g of Se
The molar mass of Se is 78.96 g/mol.
5.5 × 10⁻⁵ g × 1 mol/78.96 g = 7.0 × 10⁻⁷ mol
Step 3: Calculate the atoms in 7.0 × 10⁻⁷ moles of Se
We will use Avogadro's number: there are 6.02 × 10²³ atoms of Se in 1 mole of Se.
7.0 × 10⁻⁷ mol × 6.02 × 10²³ atom/1 mol = 4.2 × 10¹⁷ atom
Steel is an alloy that is used in making strong roofs because of its enhanced mechanical and chemical properties. Do you consider steel to be more or less malleable than the elements that make it? Explain your answer. Use in your answer the term lattice energy.
Answer:
Steel is less malleable.
Explanation:
Steel is less malleable than the elements that make it because of the presence of carbon in it. Steel is an alloy of iron and carbon which is harder than iron because of the presence of carbon. Iron in its pure form is softer that able the atoms slip over one another. If carbon is added, they stop the iron atoms from sliding apart so easily. This makes the metal stronger and harder.
The combination of all the forces on an object is called?
Answer:
net force
Explanation:
Rust forms when the iron is exposed to water and oxygen.
True
False
Answer: true
Explanation:
Nonliving and living things are made of matter.which of the following statements is true about matter
Answer:
list the statements so i can help
Explanation:
Answer :Nonliving and living things can be made up of combined elements
Explanation:
4. List if each of the following data is qualitative or quantitative:
a. ________________ Green
b. ________________ 5.7 grams
c. ________________ Large
d. ________________ 120 lbs
Explanation:
a. qualitative
b. quantitative
c. quantitative
d. quantitative
Hope this helps you.
what is the mass of 5.8 moles of H2S
Answer:
Mass = 197.78 g
Explanation:
Given data:
Number of moles = 5.8 mol
Mass of H₂S = ?
Solution:
Formula:
Mass = number of moles × molar mass
molar mass of H₂S = 34.1 g/mol
by putting values,
Mass = 5.8 mol × 34.1 g/mol
Mass = 197.78 g
Thus, 5.8 moles of H₂S have 197.78 g mass.
what displays the number of atoms, nature and bond types in organic compounds
Answer:
Structural formula
Explanation:
Various type of formulae describe an organic compound. The empirical formula only shows the ratio of atoms of each element present. The molecular formula shows the exact number of atoms of each element present.
Lastly, the structural formula shows us the arrangement of these atoms in space. It shows us the number of atoms, nature and bond types in organic compounds.
The structural formula enables us to picture what the real molecule must look like.
Are most snakes venomous or nonvenomous?
Answer:
nonvenomous
Explanation:
Answer:
Around a quarter of all snake species are identified as being venomous. Most are harmless, but others have potent venom and at least five species, including the boomslang (Dispholidus typus), have caused human fatalities.
Explanation:this what go ogle has to say
Magnesium ions for ionic bonds with fluoride ions in a 1:2 ratio. Explain how electrons are transferred between atoms and how the ionic bonds form in this compound.
I hope this helps......
Due to its low-density styrofoam isn't economically feasible to recycle and is becoming a widespread pollutant. Styrofoam is polymerized from which starting molecule?
A. Septane
B. Ethylene
C. Styrene
D. Acetylene
PLS HELP THANK YOU!!!
Answer: Polystyrene (PS) is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum.
Explanation:
Help due at 11:59 I really need to pass this year
Answer:
i think its eye color
hope its right and this helps
Consider four elements from Group 17: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy? A. fluorine B. chlorine C. bromine D. iodine E. You need more data to predict the first ionization energy of these elements.
Answer:
A. Fluorine
Explanation:
I got it right on Plato.
50 POINTS TO WHO ANSWERS THIS!!!
Select from the drop-down menu to correctly complete the sentence.
In order for a chemical reaction to take place, a certain amount of must be present.
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature
Answer:
Temperature
Explanation:
How many hydrogen molecules are in 1.2 moles of hydrogen?
Answer:
7.22 x 10²³molecules
Explanation:
Given parameters:
Number of moles of hydrogen = 1.2moles
Unknown:
Number of molecules of hydrogen = ?
Solution:
From the concept of moles, a mole of a substance contains the Avogadro's number of particles.
1 mole of a substance = 6.02 x 10²³ molecules;
So; 1.2 moles of hydrogen = 1.2 x 6.02 x 10²³ molecules;
= 7.22 x 10²³molecules
In the Martian movie, how did the NASA discover Watney is alive?
Answer:
In the film version, they discover that he is still alive by noticing two things on the satellite imagery:
The Rover has been moved from where it was parked originally (prior to the evacuation)
The solar panels had been cleaned.
They also spotted tents attached to the hab for growing potatoes. In the film, the potatoes were grown completely inside the HAB, so no external tents would have been seen by the satellite.
A 475 cm3 sample of gas at standard temperature and pressure is allowed to expand until it occupies a
volume of 600. cm3. What temperature would be needed to return the gas to standard pressure?
The final temperature : 345 K
Further explanationGiven
475 cm³ initial volume
600 cm³ final volume
Required
The final temperature
Solution
At standard temperature and pressure , T = 273 K and 1 atm
Charles's Law :
When the gas pressure is kept constant, the gas volume is proportional to the temperature
V₁/T₁=V₂/T₂
Input the value :
T₂=(V₂T₁)/V₁
T₂=(600 x 273)/475
T₂=345 K
Calculate the mass of a
molecule of sulfur (IV) oxide
and express it in grams,
kilograms and daltons.Please help
Answer:
10.63 × 10^(-24) g
10.62 × 10^(-27) kg
64 daltons
Explanation:
Formula for sulfur (IV) oxide is; SO2
Now,
Atomic mass of Sulphur is 32 while atomic mass of oxygen is 16.
Thus;atomic mass of SO2 is;
32 + (16 × 2) = 64 amu
Now,
1 mole of a substance has 6.02 × 10^(24) molecules
Therefore mass of 1 molecule of SO2 will yield;
Mass(g) = 64/(6.02 × 10^(24)) = 10.63 × 10^(-24) g
Converting to kg, we have;
10.63 × 10^(-24) ÷ 1000 = 10.62 × 10^(-27) kg
Now, converting to Dalton, we know that;
1kg = 6.022 × 10^(26) amu
Thus; 10.62 × 10^(-27) kg will yield;
(10.62 × 10^(-27) × 6.022 × 10^(26))/1 ≈ 64 amu
Now, from conversion;
1 amu = 1 Dalton.
Thus, 64 amu = 64 daltons
The statement that "Newton knew what gravity did but he could not explain why gravity did it is the basic difference between?
A. A scientific law and a scientific theory
B. A scientific theory and a societal law
C. A scientific law and societal law
D. A hypothesis and scientific law
B. A scientific theory and a societal law
Newton's law states that:
Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.Newton could not explain:
Newton could describe gravity, but he didn't know how it worked. In Principia, Newton described gravity as an ever-present force, a tug that all objects exert on nearby objects. The more mass an object has, the stronger its tug. Increasing the distance between two objects weakens the attraction.Thus, correct option is B i.e. the difference between a scientific and societal law.
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How do ion charges differ
for the fourth main group
column and the transition
metals?
Answer:
How do ion charges differ for the fourth main group column and the transition metals? Do not have common charges. Transition metals tend to form positive ions, but the number of electrons that are lost varies. Describe how atoms with a large difference in electronegativity form ionic bonds.
Explanation: ?
Can someone help me determine the name of the formula
Which of the following is the smallest particle of matter?
A. Atom
B. Cell
C. Molecule
D. Organ
Answer:
A. Atom
Explanation:
Hope this helps !
Consider the double replacement reaction given below: HgNO3(aq) + KBr(aq) → HgBr (??) + KNO3(??)The state of matter for HgBr would be
Answer: The state of maater for HgBr is solid.
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]HgNO_3(aq)+KBr(aq)\rightarrow HgBr(s)+KNO_3(aq)[/tex]
When two atoms are bonded and have a large difference in electronegativity:
HELP PLEASEEE
Answer:
Second option - The bond is very polar
Explanation:
Electronegativity of an basically refers to the degree at which an electron is able to attract electrons to itself.
There are different types of bonds between atoms, depending on the electronegativity of the atoms.
When there is a large difference in electronegativity, it pretty much means that one atom would draw electrons more than the other. When this happens, the bond is said to be polar because there is uneven distribution of the charges.
The second option is the correct answer in thus question.
PLeas hurry
Which of the following matches a human action with its impact?
Construction of dam : Scarcity of water for animals
Use of fertilizers : Increase in the population of aquatic animals
Decrease in honeybee population : Increase in plant population
Construction of roads : Improvement in quality of water in local lakes
Answer:
construction aka A
Explanation:
got 100
Physical and chemical properties are used to describe and identify matter. Physical properties can be observed without changing the identity of the substance. Chemical properties can be observed by attempting to change the identity of a substance. What are two physical and chemical properties that you can use to help you identify a substance?
Extensive properties, such as mass and volume, depend on the amount of matter that is being measured. ... Both extensive and intensive properties are physical properties, which means they can be measured without changing the substance's chemical identity
When 80.0 grams of calcium chloride react with silver nitrate, how many grams of silver
chloride are produced?
CaCl2 + 2 AgNO3 - Ca(NO3)2 + 2 AgCI
Answer:
Mass = 206.38 g
Explanation:
Given data:
Mass of calcium chloride = 80.0 g
Mass of silver chloride formed = ?
Solution:
Chemical equation:
CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl
Number of moles of CaCl₂:
Number of moles = mass/molar mass
Number of moles = 80.0 g/ 110.98 g/mol
Number of moles = 0.72 mol
Now we will compare the moles of CaCl₂ and AgCl
CaCl₂ : AgCl
1 : 2
0.72 : 2/1×0.72 = 1.44 mol
Mass of silver chloride:
Mass = number of moles × molar mass
Mass = 1.44 mol × 143.32 g/mol
Mass = 206.38 g
A 5.0 g sample of metal was heated to a temperature of 100.0 °C then placed into a calorimeter containing 35 mL of water at 20.0°C.
The final temperature was 26.5°C What is the specific heat capacity of the metal?
The specific heat capacity of the metal : c = 2.59 J/g °C
Further explanationGiven
5 g sample
35 ml water = 35 g
Required
The specific heat capacity of the metal
Solution
Heat can be formulated :
Q = m.c.Δt
Q in = Q out
Q absorbed = Q released
Q water = Q metal
35 g x 4.184 J/g °C x (26.5-20)= 5 x c x (100-26.5)
951.86 J = 367.5 x c
c = 2.59 J/g °C