Answer:
We have,
Initial volume is V
1
Initial temprature is T
1
=75
0
C
Initial pressure is P
1
So, final temprature is T
2
=273+75=348K
V
2
=V
1
−
100
15
V
1
=
100
85V
1
Applying the gas formula,
T
1
P
1
V
1
=
T
2
P
2
V
2
348
P
1
V
1
=
T
2
×100
2P
1
×85V
1
T
2
=
100
2×85×348
T
2
=591.6K
In order for an organism to survive, what must it do?
stay healthy
select a habitat
regenerate
reproduce
Answer:
Stay Healthy/ A
Explanation: k12
Answer: stay healthy
Explanation: got it in k12 have a g day
Round 9.9100881 × 101 to 6 significant digits in decimal form.
Answer:
Round to six significant = 1000.92
Explanation:
Given data:
Given value = 9.9100881×101
Round given value to six significant figures
Solution:
Significant figures:
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
How to round the digits:
First we will look at the six digit of given values.
we will draw a line after six digit then we will look the digit after line.
It the digit after line which is 7th digit is 5 or more than 5 then one will be added to the six digit.
If it it is less than five then six digit remain same.
After this we will add zeros to the right till decimal point.
In given measurement:
9.9100881×101 = 1000.9188981
1000.9188981
Six digit is 1 and 7th is 8 thus 1 is converted into 2.
Round to six significant = 1000.92
Explain why non ionic compounds are soluble in water ?
Studying the solar system helps scientists learn about the universe. Why might a scientist use a model to represent the solar system? A. The actual solar system moves too slowly B. The actual solar system is too large O C. The actual solar system is too simple D. The actual solar system is too small
Answer:D- the actual solar system is too large
Explanation: just took the quiz
Answer: The actual solar system is to large.
Explanation: well it's not because its to small and definitely not because it's too simple. and because it moves slowly doesn't make sense. so its B. hope this helps :)
What is the molar mass of an unknown gas with a density of 2.00g/L at 1.00 atm and 25.0C
Answer:
Explanation:1. A 2.650-g sample of a gas occupies a volume of 428 mL at 0.9767 atm and 297.3 K. What is its molar mass?
2.
a. A sample of nitrogen gas has a volume of 10.0 L at 2.50atm and 50.0℃. If the pressure is increased to 5.00 atm and the temperature decreases to 25.0℃, what volume does the gas occupy?
(a). 5.00L, (b).4.61L, (c).2.50L, (d).5.42L
b. Using the average bond energy, calculate the enthalpy of the above reaction. draw Lewis structures of the reactants and products first to determine the exact bond order. N2(g)+3H2(g)→2NH3(g)
A gas in a large syringe has a volume of 300ml at 45°C. The temperature is lowered to 30°C. What is the new volume of the gas in the syringe? (N and p are constant). Hint:Convert temperature to kelvin before calculating (°C+273=K)
Answer:
V1=300ml
V2= x ml
T1= 45 Celsius
T2= 30 celcius
Do the math....
you will get
318x=90900
divide by 318
x=285.8 ml (rounded)
Explanation:
you have to add 45 and 30 (separately because the temp. has to be in kelvin) to 273... so V2 equals 2858.8 ml
1. Why is the metal heated in a dry test tube rather than just putting it straight into the boiling water?
Answer:
Students heat up a metal sample by placing it into a test tube suspended in boiling water. Since the water is boiling, the metal evnetually reaches the same temperature as the boiling water: 100oC. ... Putting the metal sample directly into the water – obviously – gets it wet.
The metal is heated in a dry test tube in order to measure the capacity of the metal.
When performing a chemical experiment, it is important to
Have your materials readyMake sure that the mixtures and elements are in the right amountTry as much as possible to have a controlled experimentInstead of putting the metal straight into the boiling water, it is necessary to measure the capacity by heating it in a dry test tube first.
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This is how manganese appears in the periodic table.
What is the arrow is pointing to?
period symbol of manganese
isotope symbol of manganese
group symbol of manganese
atomic symbol of manganese
Answer:d
Explanation:took the test
The arrow in the statement is likely pointing to the atomic symbol of manganese, which is the letter "Mn." Therefore, option (D) is correct.
In the periodic table, elements are organized based on their atomic number, which corresponds to the number of protons in the nucleus of an atom. Manganese has an atomic number of 25, indicating that it has 25 protons. The atomic symbol is a shorthand representation of the element's name, allowing for easy identification and reference.
Therefore, the arrow is pointing to the atomic symbol of manganese, "Mn," indicating its position in the periodic table and distinguishing it from other elements. The atomic symbol is a fundamental component of the periodic table, enabling scientists to communicate and study elements and their properties more efficiently.
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1. The elements in a compound
a. Combine by reacting with each other
b. Join in a specific ratio
c. Can be separated using chemical means
d. All of the above
Answer:
d.All of the above
Explanation:
They can do all of the above
what type of consumer are bears?
Calculate the number of moles in 144 g of P. Please show your work to receive credit.
Answer:
144 g of phosphorus contain 4.65 moles.
Explanation:
Given data:
Mass of phosphorus (P) = 144 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of phosphorus is 31 g/mol
Now we will put the values in formula.
Number of moles = 144 g/ 31 g/mol
Number of moles = 4.65 mol
Thus, 144 g of phosphorus contain 4.65 moles.
What term describes the ability of something to float on water
A) density
B) buoyancy
C) magnetism
D) solubility
Answer: (B) Buoyancy
Explanation: Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy
Answer:
[tex]\boxed {\tt B. \ Buoyancy}[/tex]
Explanation:
Let's define each answer choice.
A. Density
The amount of mass in a certain spaceB. Buoyancy
The tendency of an object to float on a fluid/waterC. Magnetism
The ability of objects to product attracting or repulsing fieldsD. Solubility
The ability to dissolveThe definition that matches "the ability for something to float on water" is buoyancy. Therefore, the correct answer is B. Buoyancy
Use the solubility rules from the Lab 4 introduction and your knowledge of qualitative separation schemes from the lab to answer the following questions.
The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+.
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl? (Hint: HCl is a source of chloride ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(b) After the addition of HCl, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4? (Hint: H2SO4 is a source of sulfate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(c) After the addition of H2SO4, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2CO3? (Hint: H2CO3 is a source of HCO3− and carbonate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(d) Choose one of the cations above and write the net precipitation reaction that occurs. (Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.)
Cu2+(aq) + (CO3)2-(aq) → CuCO3(s)
Your answer contains an improperly or incompletely formatted chemical formula. Your answer contains improper superscript or subscript
Answer:
Explanation:
a ) silver chloride AgCl and lead chloride PbCl₂ Hg₂Cl₂ , are not dissolved in ware
so Ag⁺ and Pb⁺² Hg₂ ⁺² will precipitate out .
b ) BaSO₄ , SrSO₄ are insoluble
Ba⁺² and Sr⁺² will precipitate out .
c )
Al₂( CO₃)₃ , Fe₂(CO₃)₃ , CuCO₃ insoluble .
Al⁺³ and Fe⁺³ and Cu⁺² will be insoluble .
d )
2Fe⁺³(aq) + 3CO₃⁻²(aq) = Fe₂(CO₃)₃ (s)
E. Give evidence to support or dispute: "In nature, the chance of finding one isotope
of an element is the same for all elements." (this objective is completed by
responding to question 2 below)
Answer:
This question appears incomplete
Explanation:
However, the chance of finding one isotope of an element is not the same for all elements because some elements/isotopes are more in abundance than some other elements/isotopes; for example the most abundant element on earth is nitrogen-14, hence the chances of finding nitrogen-14 in nature is higher the chances of finding any isotope of Xenon.
Also, while isotopes occur naturally, some do not. Hence, the chances of finding a naturally occurring isotopes (no matter how rare like Xenon-126) is higher than the chances of finding artificial radioisotopes like technetium-95 and promethium-146 (whose chances are zero because they cannot be found naturally occurring).
Which of the following elements would be expected to have the highest electronegativity?
1. As
2. Li
3. P
4. Al
5. Ge
Answer:
option (3) P is the correct answer.
Explanation:
electronegativity of As is 2.0
electronegativity of Li is 1.0
Electronegativity of P is 2.1
Electronegativity of Al is 1.5
electronegativity of Ge is 1.6
So P (phosphorus) would be expected to have highest electronegativity.
Electronegativity measures the Capability of an atom to pull the shared paired of electrons.
Electronegativity is determined by the following factors
nuclear charge.
the number and the location of different electrons inside the atomic shells.
The size or strength of something, like a force.
Velocity
Acceleration
Magnitude
Direction
The size or strength of something like a force is acceleration. Thus, option b is correct.
What is force?
In general language we can say that push or pull is called force.
According,to newton second law of motion force is rate change of momentum it means
F= d/dt×(mxv)
Where m is mass and v is velocity
But in general case mass is constant.
So ,Force
F= mxd/dt×(v)
Since we know that rate change of velocity is acceleration.
Then we can say that
F= mass x acceleration
S.I unit of force is Newton
1 Newton = 1kg×m/sec^2.
Force and acceleration is a physical quantity which have both i.e magnitude and direct it means both are vector quantity. According,to newton second law of motion force is rate change of momentum it means
F= d/dt×(mxv)
Therefore, the size or strength of something like a force is acceleration. Thus, option b is correct.
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What is the molar mass of an unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C?
Answer:
48.9 g/mol
Explanation:
n=(atm x v)/(.08206 x 298)
The molar mass of the gas 49.0 g/mol.
Given:
Unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C.
To find:
The molar mass of an unknown gas.
Solution:
The mass of gas = m
The volume of the gas =V
The molar mass of the gas = M
The density of the gas = d = 2.00 g/L
[tex]d=\frac{m}{V}[/tex]
The pressure of the gas = P
The temperature of the gas T = 25.0 °C = 25.0+273.15 K=298.15 K
The ideal gas equation:
[tex]PV=nRT\\\\PV=\frac{\text{Mass of gas(m)}}{\text{Molar mass of gas(M)}}RT\\\\PM=\frac{m}{V}RT \\\\PM=dRT\\\\1 atm\times M=2.00 g/L\times 0.0821 atm L/molK\times 298.15 K\\\\M=\frac{2.00 g/L\times 0.0821 atm L/molK\times 298.15 K}{1 atm}\\\\M=48.96 g/mol \approx 49.0 g/mol[/tex]
The molar mass of the gas 49.0 g/mol.
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why do we fill balloons with helium gas instead of oxygen gas
Answer: cause oxegeon is harmful then helium
Explanation:
10)
Identify the correct formula for hydrochloric acid.
A)
HCL
B)
HCLO
HCLO4
D)
H2C1
What is a product made from nonrenewable resources?
a shirt made from natural plant fibers
a bookshelf made from wood
a nail made from the metal iron
a paintbrush made from horse hair
Answer:
C. a nail made from the metal iron
Explanation:
I did the test.
The product made from non-renewable resources is nail made from the metal iron.
What are nonrenewable resources?Non renewable resources are materials that do not replenish themselves but they are easily exhausted or diminished after a period of time.
Therefore, The product made from non-renewanleable resources is nail made from the metal iron.
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Please help, I will give brainliest
WILL GIVE BRANLIEST‼️
Answer:
its c
Explanation:
Answer:
The answer is.......... C!
Explanation:
Which types of particles are charged and located within the nucleus of an atom?
a. protons and electrons
b. neutrons
c. electrons
d. protons
List the official SI units
Answer:
The seven SI base units, which are comprised of:
Length - meter (m)
Time - second (s)
Amount of substance - mole (mole)
Electric current - ampere (A)
Temperature - kelvin (K)
Luminous intensity - candela (cd)
Mass - kilogram (kg)
Explanation:
Answer:
The seven SI base units, which are comprised of:
* Length - meter (m)
* Time - second (s)
* Amount of substance - mole (mole)
* Electric current - ampere (A)
* Temperature - kelvin (K)
* Luminous intensity - candela (cd)
* Mass - kilogram (kg)
Explanation:
Hope this helps :)
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does hydrogen builds all the acids??
Answer:
hydrogen builds many acids but not all
24 of 30
19
20
21
22
23
24
25
26
27
28
Which feature can distinguish between an elemental molecule and a compound molecule?
whether the molecule is formed from at least two atoms
O whether the molecule is formed by the sharing of electrons
O whether the molecule is a gas or a liquid
O whether the molecule is made from different types of atoms
Answer:
whether the molecule is formed from at least two atoms
Explanation:
A feature that distinguishes an elemental molecule and a compound molecule is whether the molecules are formed from at least two atoms.
An elemental molecule is a molecule that contains two or more of the same kind of elements.
A compound molecule contains two or more different kinds of molecules.
An example of elemental molecule is oxygen gas, O₂. An example of a compound molecule is water H₂O.A molecule is a unit of a compound that can represent such a compound.
Therefore, what distinguishes an elemental molecule from a compound molecule is whether a molecule forms from at least two atoms.
U
Question 13
4 pts
Using the formula Na + Cl2 --> NaCl, if 3.93 moles of chlorine are combined
with excess* sodium, how many moles of sodium chloride will be made? Note
that in this question, excess means extra or as much as you need.
Answer:
7.86 moles of sodium chloride are produced.
Explanation:
Given data:
Moles of chlorine = 3.93 mol
Amount of sodium = excess
Moles of sodium chloride formed = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Now we will compare the moles of sodium chloride with chlorine.
Cl₂ : NaCl
1 : 2
3.93 : 2×3.93 = 7.86
Chlorine is limiting reactant that's why we compare the NaCl with only number of mole of chlorine.
Thus, 7.86 moles of sodium chloride are produced.
How are ionic compounds named? (APEX!)
A. A number is given in parentheses after each elements name to indicate the number of atoms
B. The name of the first element is followed by that of the second element, the latter of which ends in -ide
C. The name of each element is followed by a To indicate the number of atoms
D. A prefix is used which each elements name, and the second element is change the end in -ine
The ionic compounds are named as The name of the first element is followed by that of the second element, the latter of which ends in -ide. Hence Option (B) is the correct.
What are Ionic Compound ?
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding.
The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.
Therefore, The ionic compounds are named as The name of the first element is followed by that of the second element, the latter of which ends in -ide. Hence Option (B) is the correct.
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Elements are identified by their atomic number because
A.the mass of an element changes over time.
B.the number of protons remains constant.
C.atoms of the same element have different numbers of neutrons.
D.elements in a group react in a similar way.
Answer:
The atomic number stands for the number of protons in an atom of the element.
The number of protons determines the identity of the element,
So the atomic number identifies the element. GOOD LESSONS ♡
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Answer:
32000 pounds
14741.752 kilograms
14741752 grams
16.25 tons