Answer:
c2h6o
Explanation:
find the hcf of the numbers and divide each number by the HCF eg
HCF of 4,12,2 -> 2
4÷2=2
12÷2=6
2÷2=1
therefore
c2h6o
How many grams of 02 are present in 7.49 L of oxygen gas?
Answer:
10.70grams
Explanation:
Density of a substance = mass/volume
At STP of a gas (standard temperature and pressure), the density of oxygen gas is 1.429 g/L
Hence, according to this question, in 7.49 L of oxygen gas, there would be:
Using D = m/V
1.429 = m/7.49
m = 1.429g/L × 7.49L
m = 10.70g
What's the purpose for a graduated cylinder
Answer:
Graduated cylinders are long, slender vessels used for measuring the volumes of liquids. They are not intended for mixing, stirring, heating, or weighing. Graduated cylinders commonly range in size from 5 mL to 500 mL.
Trust me mark me as brainliest trust me
Which functional group identifies a compound as an alcohol
Answer:
-OH functional group
Trust me
How many liters of water would you need to add to 4.36 moles of NaCl to create a 9.4 M solution?
Answer:
0.464 L
Explanation:
Molarity (M) = number moles (n) ÷ volume (V)
According to the information given in this question:
number of moles (n) = 4.36 moles
Molarity = 9.4M
Volume = ?
Using M = n/V
9.4 = 4.36/V
9.4V = 4.36
V = 4.36/9.4
V = 0.464 L
Hence, 0.464L of water are needed the volume of water.
ASAP
A chemical equilibrium between gaseous reactants and products is shown.
N2(g) + 3H2(g) ⇌ 2NH3(g)
How will the reaction be affected if the pressure on the system is increased?
It will shift toward the reactant side as there is lower pressure on the reactant side.
It will shift toward the product side as there is higher pressure on the product side.
It will shift toward the reactant side as there are a greater number of moles of gas on the reactant side.
It will shift toward the product side as there are a fewer number of moles of gas on the product side
The chemical equilibrium is the state at which the rate of reaction is constant. The increase in pressure shifts the reaction towards the product side, as fewer moles of the product are there.
What are the factors affecting the chemical equilibrium?The chemical equilibrium is shifters with the change in the concentration, temperature, pressure, and volume of the reaction.
The increase in the pressure results in more contact between the reactant molecules, as they are more in number and moles in the reaction.
The increased collision of the reactant molecules tried to reach the equilibrium condition, and the increased formation of the product is observed.
Thus, the increase in the pressure shifts the chemical equilibrium towards the product, as there were few moles of the product in the reaction.
Learn more about chemical equilibrium, here:
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Answer:
its C
Explanation:
just took the test
A bond that occurs between metals and nonmetals is called a/an:
Answer:
Ionic Bond
Explanation:
The bond between metals and non-metals is an ionic bond. This is due to the large difference in electronegativity between the non-metal and metal. Metals give up electrons easily, so they will have lower electronegativities. Non-metals can easily gain electrons, so they have high electronegativities. If you look at valence electrons, they will extensively/exclusively surround the non-metal.
A bond that occurs between metals and non-metals is called an [tex]\sf\purple{ionic\: bond}[/tex].
Explanation:-
Ionic bonds usually involves the transfer of electrons from a metal atom to a non-metal atom.
The metals lose electrons and form cations while the non-metals accept the lost electrons and form anions.
[tex]\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{❦}}}}}[/tex]
What happens te energy in an open system
A Energy can ex but not enter an open system,
B Energy cannot enter or exit an open system
6. Energy can enter but not exit an open system,
D Energy can enter er alt an open system
Answer:
A
hope its helpful please mark brainliest
How many atoms are present in 44.89 moles of Be?
Answer:
I hope that helps. I did not round the answer at the end. Maybe you want the final answer in a specific decimal place.
calculate the percentage of oxygen in Al(NO3)3
Answer;
4.29%
Explanation:
molecular weight of Al(NO3)3 is
27+(14+16*3)3=213 amu
total mass of oxygen is 3*3=9 amu
percentage is 9/213*100=4.25%
Question 3 (4 points)
The concentration of hydroxide ions in a solution that has a poH of 6.0 is
a
10-6 M.
Ob
106 M.
Ос
101 M.
Od
10-8 M.
Answer:
a. 1.0 × 10⁻⁶ M (≈ 10⁻⁶ M)
Explanation:
Step 1: Given data
pOH of the solution: 6.0
Step 2: Calculate the concentration of hydroxide ions ([OH⁻]) in the solution
We will use the definition of pOH.
pOH = -log [OH⁻]
[OH⁻] = antilog -pOH
[OH⁻] = antilog -6.0
[OH⁻] = 1.0 × 10⁻⁶ M
Since [OH⁻] > 10⁻⁷ M, we can conclude that the solution is basic.
2. (05.02 MC)
What is the mass of a sample of NHz containing 7.20 x 1024 molecules of NH3? (5 points)
161 grams
187 grams
203 grams
214 grams
HELPPPPPP
Solution :
We know, molecular mass of NH₃ is , M = 17 g/mol .
Number of moles of NH₃ in 7.2 × 10²⁴ are :
[tex]n = \dfrac{7.2 \times 10^{24}}{6.022 \times 10^{23}}\\\\n = 11.96\ moles[/tex]
So, mass of NH₃ present in 11.96 moles is :
m = 11.96 × 17 gram
m = 203.32 gram
Hence, this is the required solution.
Classify each of the following elements as a metal, nonmetal, or metalloid.
Na, Ge, Si, Br, Ag
Metal
Nonmetal
Metalloid
Multiple Choice
Which statement is not part of Dalton's atomic theory?
All atoms of a given element have the same mass and other properties.
Certain groups of elements have similar properties.
Each element is composed of indestructible particles called atoms.
Atoms combine in simple whole-number ratios to form compounds.
Which of the following statements is true about the properties of protons, neutrons, and electrons?
One positive charge cancels (neutralizes) another positive charge.
One negative charge cancels (neutralizes) another negative charge.
Positive and negative charges attract.
Protons have much less mass than neutrons and electrons.
ig i i i i i i i i i ii i i i i i ii i i i i i
1. Na is metal
Ge is Metalloid
Si is Metalloid
Br is Nonmetal
Ag is Metal
2. Each element is composed of indestructible particles called atoms.
3. Positive and negative charges attract.
What is Chemistry?Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.
In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. primary chemical bonds—e.g., covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); metallic bonds—and 2. secondary chemical bonds—e.g., hydrogen bonds; Van der Waals force bonds; ion-ion interaction; ion-dipole interaction.
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A 59.0 mL portion of a 1.80 M solution is diluted to a total volume of 258 mL. A 129 mL portion of that solution is diluted by adding 183 mL of water. What is the final concentration
Answer:
0.170 M
Explanation:
As this is a series of dilutions, we can continuosly use the C₁V₁=C₂V₂ formula to solve this problem:
For the first step:
59.0 mL * 1.80 M = 258 mL * C₂C₂ = 0.412 MThen for when 129 mL of that 0.412 M are diluted by adding 183 mL of water:
V₂ = 129 mL + 183 mL = 312 mLUsing C₁V₁=C₂V₂:
129 mL * 0.412 M = 312 mL * C₂C₂ = 0.170 MHow many moles are in 153.00 grams of KCL3?
Explanation:
you have to use the formula
number of moles=mass/molar mass
=153/145.5
=1.05g/mol
I hope this helps
A solution is prepared by mixing 0.10 of 0.12 M sodium chloride with 0.23 L of a 0.18 M magnesium chloride solution. What is the pCl- of the resulting solution?
Answer:
pCl⁻ = 0.54
Explanation:
First we calculate how many Cl⁻ moles are coming from each substance, using the given volumes and concentrations:
0.12 M NaCl * 0.10 L = 0.012 mol NaCl = 0.012 mol Cl⁻0.18 M MgCl₂ * 0.23 L = 0.0414 mol MgCl₂ = (0.0414 * 2) 0.0828 mol Cl⁻The final volume of the mixture is = 0.10 L + 0.23 L = 0.33 L
Now we calculate [Cl⁻], using the total number of Cl⁻ moles and the final volume:
[Cl⁻] = (0.012 mol + 0.0828 mol) / 0.33 L = 0.29 MFinally we calculate the pCl⁻ of the resulting solution:
pCl⁻ = -log[Cl⁻]pCl⁻ = 0.54What is the molar mass of H2SO4?
(Molar mass of H = 1.0079 g/mol; S = 32.065 g/mol; O = 15.999 g/mol)
Answer: 98.08 g/mol
Explanation:
i just took this test and got it right
Answer:
A
Explanation:
he specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be
Complete question is;
The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The specific heat capacity of a certain substance has been measured to be 3.52 J/g°C. Suppose 420.0 g of the substance is heated until the temperature of the sample has changed by 43.8 °C.
Write an equation that will let you calculate the last Q that was needed for this temperature change. Your equation should contain only symbols. Be sure to define each symbol.
Answer:
Q = m•c•Δt
Q = 64753.92 J
Explanation:
We are given;
Mass (m) = 420 g
Change in temperature; (Δt) = 43.8 °C
Specific heat capacity (c) = 3.52 J/g °C
The last Q is simply the heat energy that caused that temperature change.
This is given by the formula;
Q = m•c•Δt
Plugging in the relevant values;
Q = 420 × 3.52 × 43.8
Q = 64753.92 J
Give the definition for diffusion. Group of answer choices gas molecules mix equally average distance between collisions gas molecules escape from a container into a vacuum through a small hole gas molecules mix unequally gas molecules spread out in response to a concentration gradient Next
Answer:
gas molecules spread out in response to a concentration gradient.
Explanation:
Diffusion can be defined as the movement of gas molecules from a region of high concentration to a region of lower concentration until an equilibrium is attained or reached. This mixing of gas molecules in the liquid or gaseous state is due to their kinetic energy of random motion i.e without requiring bulk motion.
This ultimately implies that, diffusion is a phenomenon through which gas molecules in either a gaseous or liquid state spread out in response to a concentration gradient, which is simply the difference in concentration of the gases across a space.
In conclusion, increasing the surface area of a gas increases its collision rate and it's considered to be an evolutionary strategy that maximizes the diffusion of gas molecules by catalysing the rate of a gaseous reaction.
(BRAINLIEST AWARD!! LAST QUESTION!!) Jean-Baptiste Lamarck's theory of evolution stated that an organism could pass on to its offspring all characteristics it had acquired in its lifetime. Which of these statements best explains why this theory is considered invalid at present? (1 point)
Modern scientists accept only new scientific theories.
Most of the scientists worldwide do not accept this theory.
All old theories change into new theories over a period of time.
Newspapers and science magazines do not publish this theory any more.
Answer:
Most of the scientists worldwide do not accept this theory.
Explanation:
Lamarck's theory states that acquired traits can be passed on from parents to offspring. This theory can not be sufficiently substantiated by indisputable scientific evidences hence it is not accepted by majority of scientists worldwide.
Since science is empirical and the theory is mostly based on vague speculations rather than concrete evidence, it was long rejected by many biologists.
This theory suggests that all life forms will gradually evolve from simple to complex organisms while the simple organisms gradually disappear. This is not the case.
Which is a group of tissues that work together to carry out a common function?
cell
organ
organelle
organ system
Answer:
Organ as a group of tissues working together is an organ.
Using dimensional analysis convert 238.0 cm3 to L
Answer:
= 0.238 L
Explanation:
From the given information:
To convert cm³ to L(liter), we utilize the advent of a unit fraction that comprises a liter in the upper part of the fraction(numerator) and a cubic centimeter in the lower part of the fraction(denominator)
Recall that:
1000 cm³ = 1 liter
∴
238.0 cm³ = [tex]\dfrac{238.0 \ cm^3}{1} \times \dfrac{1 \ L}{1000 \ cm^3}[/tex]
= 0.238 L
If I contain 3 moles of gas in a container with a volume of 60 liters and at a temperature of 400 K, what is the pressure inside the container in mmHg?
Answer:
n = 3.0 moles
V = 60.0 L
T = 400 K
From PV = nRT, you can find P
P = nRT/V = (3.0 mol)(0.0821 L-atm/K-mol)(400 K)/60.0L
P = 1.642 atm = 1.6 atm (to 2 significant figures)
Explanation:
Identify The compound with the highest vapor pressure
Answer:
I think the answer will be A
Answer:
ch3och3
Explanation:
The pH of a 0.0001 M NaOH solution is (note: For strong bases such as NaOH, the hydroxide ion concentration is the same as the concentration
of the base)
10
5
а
Ob
о с
Od
3
8
Answer:
pH = 10
Explanation:
As the problem states, with strong bases the hydroxide ion concentration [OH⁻] is equal to the concentration of the base. That means that in this case:
[OH⁻] = 0.0001 MWith [OH⁻] we can calculate the pOH of the solution:
pOH = -log[OH⁻]pOH = 4Then with the pOH, we calculate the pH of the solution:
pH = 14 - pOHpH = 10A fungicide was used to kill the mushrooms in a
lawn. Some mushrooms were not affected by the
fungicide. The resistant mushrooms reproduced.
The resistance of some of the mushrooms to the
fungicide was
Answer: a
Explanation:
One atom of chromium (Cr) has a mass of 52.00 amu. How many chromium atoms does it take to equal a mass of 52.00 g?
1 chromium atom
Explanation:
number of (Cr) atom =
[tex] \frac{mass \: of \: cr}{molar \: mass \: (amu)} [/tex]
n = m/M
n = 52/52
n= 1g
Once formed, how many valence electrons does an anion hold?
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
Define electronegativity
Answer: Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.
Explanation: Hope this helps!
PLEASE HELP NEED IT ASAP
A solution has a [H3O+] of 1 × 10−3 M. What is the [OH−] of the solution?
11 M
14 M
1 × 10−14 M
1 × 10−11 M
Answer:
1 × 10−11 M
Explanation:
I took the test :) guy above me is right
What characteristic of a light wave in a medium determines the index of refraction of that
medium?
Answer:
The refractive index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values: the speed of light in a medium is v = c/n, and similarly the wavelength in that medium is λ = λ0/n, where λ0 is the wavelength of that light in vacuum.
Explanation: