Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. ... All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.
Answer:
Explanation: Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. ... All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.
if i have 2.4 moles of gas held at a temperature of 97 c and in a container with a volume of 45 L , what is the pressure of the gas
Answer:
1.62 L
Explanation:
T= 97+273.15= 370.15
R= 0.08206 atm/mol⋅K
V= 45 L
n= 2.4 mol
P= (n⋅R⋅T)/V
= (2.4 x 0.08206 x 370.15)/(45) = 1.61997 = 1.62
The pressure of the gas is 1.62 atm. This can be calculated by using ideal gas law that gives direct relation between P,V and T
Ideal gas Law:This law states that pressure and volume are directly proportional to the temperature of the gas.
What information do we have?
T= 97+273.15= 370.15 K
R= 0.08206 atm/mol⋅K
V= 45 L
n= 2.4 mol
To find:
P=?
Ideal gas law is given by:
PV=n.R.T
P= (n⋅R⋅T)/V
P= (2.4 x 0.08206 x 370.15)/(45)
P= 1.61997
P= 1.62 atm
Thus, the pressure of the gas is 1.62 atm.
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ancient hunters used obsidian rock to make spears. given this information, what can you conclude about the minerals in obsidian rock? explain your reasoning.
it must have been light, so it can be more mobile, and strong to penetrate skin and flesh, and easy to carve so they can put it on a spear.
your welcome and a brainliest would be nice if you can
Bonds are broken in an____
reaction.
a). Endergonic
b). Exergonic
Answer:
Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions.
Explanation:
Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions. These reactions where chemicals are broken down are called “catabolism” – the destructive part of metabolism. By contrast, reactions where chemical bonds are formed are often endergonic.
A 2.70g vitamin C tablet is found to contain 0.0109 mol of
ascorbic acid (C6H806}. The molar mass of C6H806 is 176.12 g/mol. What
is the mass percent of C6H806 in the tablet?
We are given:
Mass of the tablet = 2.7 grams
Number of moles of Ascorbic acid present in the tablet = 0.0109 moles
Molar mass of Ascorbic acid = 176.12 g/mol
Mass of Ascorbic Acid present in the tablet:
Mass of a given number of moles = number of moles * molar mass
replacing the variables
Mass = 0.0109 * 176.12
Mass = 1.92 grams (approx)
Mass percent of Ascorbic acid:
Mass% = ([tex]\frac{Mass of Ascorbic Acid}{Mass of the Tablet}[/tex]) * 100
replacing the variables
Mass% = (1.92 / 2.7) * 100
Mass% = 192 / 2.7
Mass% = 71.12 %
Therefore, the tablet has 71.12% Ascorbic Acid by mass
Answer:
71.1
to 3 sig figs
Explanation:
from Khan Academy
Bohr’s model of the atom compares electrons to ____________________ .
Answer:
The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus (think of planets orbiting around the sun). ... He said that the energy of an electron is quantized, meaning electrons can have one energy level or another but nothing in between.
Explanation:
H= aC+ b what does this mean?
Answer:
I think it's Hydrogen is equal to aCalcuim plus b
Pls answer quickkk :)))
Answer:
c turns back when iodine is added result indicated a chemical reaction
Select the sentences in the paragraph that explain only the dark lines that are produced in the absorption spectra. Select all that apply.
A light is shown through a cold, dilute gas. Over time, excited atoms revert to their original lower energy state. Photons emitted travel in different directions that the original photon. Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons. Dark lines in an absorption spectrum of light can be seen when the gas lies between the light source and observer.
Answer:
Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons.
Explanation:
When electrons in atoms absorb energy, they move from a lower energy level to a higher energy level. With time, they revert to the their original energy state emitting a photon of light of appropriate wavelength.
The absorbed photons do not show up in the spectrum. They appear as dark lines in the spectrum. Hence, the absorption spectrum is the exact inverse of the emission spectrum. The dark lines in the spectrum indicates that the colors that ought to occupied those points there have been absorbed.
alison measured the temperature of benzene as 26.1K if the correct value is 24.9K what is the percent error
Answer:
Percent error = 4.8%
Explanation:
Given data:
Measured value = 26.1 K
Actual value = 24.9 K
percent error = ?
Solution:
Formula:
Percent error = [ measured value - actual value/ actual value] × 100
Percent error = [26.1 K - 24.9 K/24.9 K] × 100
Percent error = [ 1.2K /24.9K]× 100
Percent error = 0.048 × 100
Percent error = 4.8%
By titration, it is found that 47.5 mL of 0.146 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
Answer:
The correct answer is 0.277 M HCl
Explanation:
NaOH is a strong base and HCl is a strong acid. NaOH reacts with HCl to form a salt (NaCl) and water via a neutralization reaction, as follows:
NaOH + HCl → NaCl + H₂O
At the equivalence point, the moles of NaOH added is equal to the moles of HCl present in the solution to be titrated. Moreover, the moles can be calculated as the product of the concentration of base or acid (Cb or Ca) and the volume (Vb and Va), as follows:
moles NaOH = moles HCl
Cb x Vb = Ca x Va
Thus, we calculate the concentration of HCl (Ca), as follows:
Ca = (Cb x Vb)/Va = (0.146 M x 47.5 mL)/(25.0 mL)= 0.277 M
Which rock type is an example of igneous glass?
1. lava
2, gabbro
PLS HURRY
3. obsidian
4. rhyolite
Answer:
obsidian
Explanation:
because it is an igneous rock which is smooth
Answer:
B) Obsidian
Explanation:
Since the igneous glass last not very long like you could say obsidian compared to normal ones.
Can a bearded dragons eat a Hammerhead worm
Answer:
Definetly not they would choke on it
Answer:
no please do not do that
Explanation:
In the laboratory you are asked to make a 0.721 m potassium chloride solution using 255 grams of water.
How many grams of potassium chloride should you add?
_____ grams.
Answer:
Mass = 13.42 g
Explanation:
Given data:
Molality of potassium chloride solution = 0.721 m
Mass of water = 255 g (255 g /1000 = 0.255 Kg)
Potassium chloride added = ?
Solution:
Molality:
Molality = number of moles of solute/ Kg of solvent
0.721 m = moles / 0.255 Kg
m = mol/Kg
Moles = 0.721mol/Kg×0.255 Kg
Moles = 0.18 mol
Mass of potassium chloride:
Number of moles = mass/molar mass
0.18 mol = Mass /74.55 g/mol
Mass = 0.18 mol × 74.55 g/mol
Mass = 13.42 g
Which describes an effect that ocean currents have on short term climete change
Answer:
ocean
Explanation:
Na₂S
Naming ionic compound
Answer:
Sodium Sulfide
Explanation:
I looked it up
Joan has four containers. The chart below shows the mass and volume of each of the containers. Two of the containers are filled with solids, one is filled with a liquid, and one is filled with a gas.
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, it should be noted that if the containers are compared with an equal average volume, the containers having solids will have larger masses than that containing liquid which will also have a larger mass than that containing gas. This is because solids have there molecules touching each other in compact manner which makes the molecule exert a certain combined force/mass. The molecules of liquid are also close to one another but are not compact like the solids and are hence exerting a lesser force/mass than solids. Gases have free molecules that are far apart and thus are usually the lightest when they occupy the same volume as liquids and solids.
How does the reactivity down group 1 and 7 differ and how is this related to the
atomic radius of these elements?
Answer:
Explanation:
Group 1 elements have a single electron (called the valence electron) in there outermost shell. Reactivity of group 1 elements (alkali metals) increases down a group; this is because as one moves down the group, the atomic radius increases thus causing the outermost electron/valence electron to be found further away from the nucleus, which makes it (the electron) to be easily lost due to weaker force of attraction between the single valence electron and the central nucleus.
However, in the case of group 7/halogen elements, as one moves down the group, the atomic radius also increases, but the reactivity reduces. This is because as one moves down the group and the atomic radius increases, the nucleus ability to attract an electron lowers, because of the increased number of electrons that shields against the pull of the nucleus (this is referred to as nuclear shielding). This is the reason fluorine is the most reactive halogen.
Is N2 a compound or an element
Answer:
Element.
General Formulas and Concepts:
Chemistry
Reading a Periodic TableDiatomic ElementsExplanation:
Diatomic Elements are elements that are bonded to themselves. Naturally, these elements are not found alone in nature.
Diatomic Elements:
Hydrogen
Nitrogen
Oxygen
Fluorine
Chlorine
Bromine
Iodine
Since Nitrogen is a diatomic element, we would find Nitrogen in nature as N₂.
Plz help!!!!!!!!!!!!!
Answer:
message on messenger johnpatrick , so I can give help you
If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom in each case, is the molecule polar, nonpolar, or does it depend on the identity of the outer atom?
Answer:
It depends on the identity of the outer atom
Explanation:
We must recall that the polarity of a molecule depends on difference In electronegativity between atoms as well as the shape of the molecule.
When a central atom has no lone pairs and all the groups in the molecule are bonding, the identity and arrangement of the outer atoms will determine the polarity of the molecule.
A polar molecule is formed by certain types of outer atoms arranged in certain ways around the periodic table and vice versa.
The identification of the outer atom determines whether the molecule is polar or non-polar. The CH4 compound, for illustration, is a non-polar compound.
There really is no dipole present here because the net dipole moments cancel one another out. As a result, the dipole moment is negligible.
The molecule CH3Cl, for instance, is a polar molecule. There is indeed a dipole force here, and the net polarization isn't zero.
As a result, it exhibits a dipole moment. As a result, the identification of the exterior atom determines whether the molecule is polar or non-polar.
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If you have 45.0g of mercury Il perchlorate, how many moles do you have?
Answer:
Approx. 0.1126 mol
What determines a molecules shape?
Answer:
the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize
Explanation:
hope this helped
Which of the following processes is exothermic?
a.
sublimation of carbon dioxide
b.
evaporation of ammonia
c.
fusion of ethanol
d.
condensation of water
e.
vaporization of water
Answer:
d. condensation of water
Answer:
I believe the answer is D). condensation of water.
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The percent composition of oxygen in XeO3 is
Answer:26.771%
Percent composition by element
Element Symbol Mass Percent
Xenon Xe 73.229%
Oxygen O 26.771%
9. How many protons, neutrons, and electrons does 35C1l- have?
O 17 protons, 16 electrons, 18 neutrons
O 16 protons, 17 electrons, 18 neutrons
017 protons, 18 electrons, 18 neutrons
O 17 protons, 17 electrons, 18 neutrons
What is the balanced chemical equation for the reaction of solid calcium metal and aqueous aluminum nitrate?
Answer:
3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)
Explanation:
Let's consider the single displacement reaction between solid calcium metal and aqueous aluminum nitrate. The unbalanced chemical equation is:
Ca(s) + Al(NO₃)₃(aq) ⇒ Ca(NO₃)₂(aq) + Al(s)
We have 3 nitrates on the left and 2 nitrates on the right, so we will multiply Al(NO₃)₃(aq) and Ca(NO₃)₂(aq) by 2 and 3, respectively, to balance them.
Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + Al(s)
Finally, we have to add coefficients before Ca(s) and Al(s) to balance the equation.
3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)
What are some properties that can be used to describe a solid, liquid and gas?
Answer:
Solids have a defined shape and volume.
Liquids have a definite volume but can take the shape of a container.
Gas has no definite volume or shape.
Answer:
See Explanation for more details...
Explanation:
Solid: defined form, minimal potential energy, it is not compressible, defined mass.
Liquid: No defined form, has more potential energy than the solids, it is not compressible, defined mass.
Gas: No defined form, high potential energy, it is compressible, defined mass.
Calculate the mass of water produced when 1.36 g of butane reacts with excess oxygen.
Answer:
Mass of water produced= 1.8 g
Explanation:
Given data:
Mass of water produced = ?
Mass of butane = 1.36 g
Mass of oxygen = excess
Solution:
Chemical equation:
2C₄H₁₀ +13 O₂ → 8CO₂ + 10H₂O
Number of moles of butane:
Number of moles = mass/molar mass
Number of moles = 1.36 g/ 58.12 g/mol
Number of moles = 0.02 mol
Now we will compare the moles of butane with water.
C₄H₁₀ : H₂O
2 : 10
0.02 : 10/2×0.02 = 0.1 mol
Mass of water produced:
Mass = molar mass × molar mass
Mass = 0.1 mol × 18 g/mol
Mass = 1.8 g
which isotope has 30 neutrons and 32 protons
Answer:
Germanium
Explanation:
What is the molarity of a solution containing 18.2 g of KCl in 215 mL of KCl solution?
Answer:
The sum would be 69109.4944 ml if that's what you were asking