Answer:
d. can be separated into components
it's the answer and i hope it helps you
1. . Are these physical or chemical changes? a) slicing cheese
b) acid reacting with baking soda to make carbon dioxide
c) emptying a gas cylinder of air
d) cooking eggs
Answer:
physical change
slicing cheese
acid with baking soda
.......cookoing eggs
The pungency of chillies is due to ____________.
Answer:
The hotness or pungency of chilli is due to presence of a group of compounds called capsaicinoids. Among capsaicinoids, capsaicin and dihydrocapsaicin are present in major quantities, while homocapsaicin, nordihydrocapsaicin and homo-dihydrocapsaicin are present in very small quantities.
The pungency of chillies is due to the presence of certain compounds called capsaicinoids.
Which statement describes a physical property of steel? O A. Steel is formed from an alloy of iron and carbon. O B. Steel has a density of 8050 kg/m3. O C. Steel is oxidized by air to form rust. O D. Steel reacts with sulfuric acid to form hydrogen gas.
Answer:
A
Explanation:
9.Out of the following which is a poly atomic molecule. (H2, CI 2.03.)
Please Please help
Answer:
H2 is poly atomic molecule
Please help ASAP!!!!!!!!
Answer:
Explanation:
I believe the answer to the blank would be pesticides
Certain pesticides contain specific chemicals that are able to attack the targeted pest. An example of this would be ant killer. Broad spectrum pesticides cause more collateral damage because they basically kill everything, including beneficial insects like bees.
Hope this helps! Best of luck <3
Determine the mass in grams of 2.25 × 10²¹ atoms of copper.
Answer:
0.373 g
hope i helped yaWhich of the following
figures has all sides
equal? A. Square, B. Rectangle
c.Circle, b. cube
Answer:
the answer should be square, because by it's area formula (l²)we can tell that all it's sides are equal.but for a circle it just has a circumference and not sides.a rectangle on the other hand has only two sides equal.
but I also think the answer could be cube because all it's faces are equal.
I hope this helps
What subatomic particles determine the mass number?
Explanation:
the protons and neutrons contribute to the mass of an element . This is because they are both found in the nucleus where the mass is mostly concentrated is
1.3499999995 rounded to three significant figures.
After rounding off to three significant figures :
[tex] \boxed{ \boxed{1.35}}[/tex]Salt solution is homogeneous mixture.Give reason
Answer:
because mixed particles are invisible in this mixture.
topic: Nomenclature and Formula Writing.
reward: up to 200 POINTS!
how?
...
Answer: Writing Formulas for Ionic Compounds Using Nomenclature Another important concept to master is the ability to write a chemical formula using the compound's systematic name.
Explanation:
why the nucleus is the densest part of atom
Answer:
it is where the dna is
Explanation:
We are driving to Orlando. The sign says
that it is 145 kilometers to Orlando.
How many meters is it to Orlando?
A: 0.145
B: 145,000
C: 14.5
D: 14,500
Answer:
b
Explanation:
there is 1000m in 1 km so the ans is literally just 145x1000 m which is 145000m
Answer:
B! 145,000
Explanation:
your welcome love!
. Why is it necessary to carry out melting point on a finely powdered sampLe
Who believed and tested his idea that microorganisms are carried through the air?
Subtract to find the temperature changes
for the water and the metal.
I
°C
AT (water) =
AT (metal) = -1
°C
Copper
Answer In picture
Answer:
1.9
Then
-75.4 C
Explanation:
In tHe PiCtuRe
A galvanic cell is constructed of one half cell in which a silver wire is placed into a 1.00 Maqueous solution of silver nitrate and the other half cell is made of a zinc wire in a 1.00 M aqueous solution of zinc nitrate. calculate gibbs free energy
Answer:
https://www.plps-k12.org/site/handlers/filedownload.ashx?moduleinstanceid=2482&dataid=3257&FileName=Ch%2017%20Electrochemistry%20Practice%20Problems%20I%20-%20key.pdf
Explanation: This is all the answers just go to this link to help is a bunch of pages to help and with answers on them too! Can I get brianliest plz
Describe what each letter and number
means in the chemical formula below.
C.H₂O
Answer: c is carbon h is hydrogen with the 2 means 2 hydrogen and o is oxygen
In conclusion alphabets represent elements and numbers represent how many elements
A cylinder fitted with a movable piston and filled with a gas has a volume of 188.5mL at 26.7 °C when the applied pressure is 755.2 torr. The temperature of the oil bath surrounding the cylinder was increased to 165.2 °C, and the load on the piston was changed. Careful measurement now gave a value of 210.5mL for the volume. What was the final pressure in the system, in torr? Select one:
O a. 715.5 tor O b. 576.9 torr Oc. 988 6 torr O d. 1233 torr 462.6 tor
Answer:
C
Explanation:
To find the new pressure, we will use this formula: P₁V₁/T₁ = P₂V₂/T₂
P₁ = Original pressure (755.2)
V₁ = Original volume (188.5)
T₁ = Original temperature in kelvins (26.7 + 273.15 = 299.85)
P₂ = Final Volume (?)
V₂ = Final volume (210.5)
T₂ = Final temperature in kelvins (165.2 + 273.15 = 438.35)
Here is our equation
(755.2)(188.5)/(299.85) = (210.5)P₂/(438.35)
Hopefully, you have a calculator handy because this equation will end up looking like this:
474.75471 = (0.48021)P₂
Divide both sides by the coefficient
474.75471/0.48021 = (0.48021)P₂/0.48021
P₂ = 988.64
When copper is changed to copper(II) nitrate by the nitric acid, it is an example of a(n) ______-_______ reaction. (two words, include the hyphen with no spaces)
Answer:
oxidation- reduction
Explanation:
where gaining electronic reduces one element and losing them oxidize the other nitric acid is not only strong it is also a oxidizing agent
Oxidize: copper = Cu+2When copper is changed to copper(II) nitrate by the nitric acid, it is an example of an oxidation-reduction.
What is molecule?
Molecule is defined as number of atoms combined together, that shows the most smaller chemical compound's fundamental unit that participate in chemical reaction. In the combination of atoms attractive forces play a vital role and it helps to bound the atoms by a chemical bond.
Liquid consist of small range of order and the reason behind this is intermolecular attractive force which is very strong and due to this reason molecules are packed together tightly. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly with one another.
Water is considered to be the simpler molecule and it consist of hydrogen and oxygen atom bounded together and due to the reason of high electronegativity of the oxygen's atom the bonds present are polar as well as covalent. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly with one another.
Therefore, When copper is changed to copper(II) nitrate by the nitric acid, it is an example of an oxidation-reduction.
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What is the vapor pressure of a solution of sucrose (C12H22011) prepared by
dissolving 40.0 g of sucrose in 400.0 g of water at 100°C? The vapor pressure of
pure water at 100°C is 760 Torr. Assume 3 sf.
a) 760 Torr
b) 10.00 Torr
c) 756 Torr
d) 2.00 Torr
The vapour pressure of the solution is 752 Torr from Raoult's law .
Mass of solute (m1) = 40.0 g
Mass of solvent(m2) = 400.0 g
Vapor pressure of solution (p) = ?
vapor pressure of pure water (p°) = 760 Torr
From Raoult's law
p = X p⁰
X = number of moles of solvent / number of moles of solution
number of moles of solvent, n₁ = mass in grams / molar mass = 400.0 g /18g/mol = 22.22 moles
number of moles of solute, n₂ = mass in grams / molar mass = 40.0 g/ 342.3 g/mol = 0.12 moles
total number of moles, n₁ + n₂ = 22.22 moles + 0.12 moles = 22.34 moles
moles fraction of water, X = 22.22 moles/22.34 moles = 0.99 moles
From Raoult's law;
p = p⁰ X
p = 760 Torr * 0.99 moles
p = 752 Torr
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You are starting a new item and after reading the first part you realize you have no idea how to go about answering it. What should you do
1) Guess randomly and hope for some useful feedback.
2) Request the solution immediately.
3) Use the available hints.
Answer: 3
Explanation: You may not always get feedback that would be helpful and requesting the answer would be cheating
Please help me please find the answer
Please do this
Please do this
Plzz
Total distance=60m+40m=100m
Total Time=6+4=10s
#a
[tex]\boxed{\sf Speed=\dfrac{Distance}{Time}}[/tex]
[tex]\\ \sf\longmapsto Speed=\dfrac{100}{10}[/tex]
[tex]\\ \sf\longmapsto 10m/s[/tex]
#b
Displacement=AC=60m
[tex]\\ \sf\longmapsto Velocity=\dfrac{Displacement}{Time}[/tex]
[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{10}[/tex]
[tex]\\ \sf\longmapsto 6m/s[/tex]
#C
Distance=60mtime=5s[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{5}=12m/s[/tex]
#d
The velocity of A to C is greater than Velocity from C to A
Katie's teacher has asked her to identify an unknown
substance. She thinks about the properties of matter that will
help her identify the substance. She knows it is a colorless
liquid. She thinks it may be water but knows there are many
colorless liquids that are not water.
Which of the following statements would inform Katie that the
liquid is NOT water?
a The liquid freezes at 32°C.
b The liquid is clear.
C The liquid boils at 100°C.
d The volume of the sample is 100 ml.
Silver has two naturally isotopes and has an atomic mass of 107.868 amu. One isotope is Ag-109 isotope (108.905 amu) and has a natural abundance of 48.16%. What is the mass in amu of the other isotope
Answer: 106.905
Explanation: If there are only 2 isotopes, and 1 of them is 48.16%, the second must, by default, be (100 - 48.16%) = 51.84% The final, averaged, atomic mass is 107.868. This is made up of each isotope's atomic mass times the percentage of that isotope in the total sample. The weighted value of the known isotope (109) plus that of the unknown must come to the observed value of 107.868 amu. (107.868 - 52.45 = 55.42). Divide that by the % for that isotope (55.42/0.5184) = 106.90 amu for the second isotope.
Atomic Mass % of Sample Weighted Value
108.905 48.16% 52.45
X 51.84% 55.42
107.87
X = (55.42/0.5184) = 106.90 amu
What is the formula of the compound in which the atom combining ratios are:
magnesium : bromine = 1:2
Enter elements in the order given:
Please help me with this
Answer:MgBr2
Explanation:
Why are intensive properties useful for identifying a substance?
A.They do not depend on the amount of substance you have.
B.They are chemical properties.
C.They are physical properties.
D.They describe the amount of substance you have.
The intensive properties are useful for identifying a substance because it does not depend upon the amount of substance present in the sample.
The points regarding properties are the following:
The intensive properties are defined as the properties which do not depend on the amount of the substance present in the matter but depend only on the type of the matter.The colour, solubility, texture, etc. are the intensive properties. •The properties which depend upon the amount of the substance present in the sample is called the extensive properties.The mass, density etc. are the extensive properties.Therefore, the correct answer is the A. They do not depend on the amount of substance you have.
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Determine the number of protons, neutrons, and electrons in the following isotopes
that are used in medical diagnoses:
a. atomic number 9, mass number 18, charge of 1-
b. atomic number 43, mass number 99, charge of 7+
C. atomic number 53, atomic mass number 131, charge of 1-
d. atomic number 81, atomic mass number 201, charge of 1+
e. Name the elements in parts (a), (b), (c), and (d).
Answer: In table below.
Explanation:
A.N. (atomic number) = protons
Mass (Total AMU)
Charge
P= Protons, same as atomic number
N = Neutrons, Atomic Mass Number - Protons
E = Electrons. (Atomic Number - Charge)
Element = Defined by atomic number
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
What is the atomic number?Atomic Number (Z)= number of protons = number of electrons
Mass number (A) = number of protons + number of neutrons.
For ions with a positive net charge:
Number of electrons = Z - net charge
For ions with negative net charge:
Number of electrons = Z + net charge
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
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What is the product of the unbalanced combustion reaction below?
C3H2(g) + O2(g) →
The Periodic Table
A. 04Hg(s) + C(s)
B. C(s) + H2(g) + O2(g)
C. CO2(g) + H2O(g)
D. C3H802(s)
What does it mean if your hypothesis is wrong? What do you do?
Answer:
The purpose of a science experiment is to prove or deny a hypothesis. One's experiment is not a failure if the results do not match the hypothesis. When the data does not support the hypothesis, record it as though it did.
Answer:
when the findings do not aligh with the hypothesis
