Answer:
There are three significant figures
Explanation:
When counting sig figs you don't count the zeros unless it is between a number greater than zero. The two zeros aren't between the greater numbers so there are only 3.
How many molecules are in 100 g of C6H120,?*
Answer:
3.37 × 10²³ molecules
Explanation:
Given data:
Mass of C₆H₁₂O₆ = 100 g
Number of molecules = ?
Solution:
Number of moles of C₆H₁₂O₆:
Number of moles = mass/molar mass
Number of moles = 100 g/ 180.16 g/mol
Number of moles = 0.56 mol
Number of molecules:
1 mole contain 6.022 × 10²³ molecules
0.56 mol × 6.022 × 10²³ molecules /1 mol
3.37 × 10²³ molecules
WORTH 20 POINTS PLZZZ HELP WILL GIVE BRANLIEST PLZZZ
A toaster transforms P energy into Q energy.
What do P and Q most likely represent?
P represents electrical energy, Q represents thermal energy
P represents thermal energy, Q represents electrical energy
P represents chemical energy, Q represents radiant energy
P represents radiant energy, Q represents chemical energy
Answer: P represents electrical energy, Q represents thermal energy.
Explanation: The toaster takes electrical energy from the electrical socket through wires and converts that into thermal energy that heats up/toasts the bread.
Answer:
P represents electrical energy, Q represents thermal energy
Explanation:
I am sorry if I get this wrong, but when I put it in the sentence - A toaster transforms electrical energy into thermal energy - it made sense to me, so I think that is the answer. I am sorry if this does not help.
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed.
Which word from the selection helps you understand that physical changes can be undone?
a added
b dissociate
c recombine.
d removed
The two liquids of the mixture having the same boiling point cannot be seperation of distillation Explain.
Answer:
True
Explanation:
Two liquids of a mixture having the same boiling point cannot be separated using the process of distillation.
Distillation is one of the process of physical separation techniques.
It relies on physical property called the boiling point. In a fractionating column, a mixture is heatedAs the boiling point of the each component compound in the mixture is reached, the compound rises up within the column.So without a difference in the boiling point of the compound that makes up a mixture, the separation by distillation will not be possible.
before the quarry was dug, the land contained more vegetation . what impact has this change most likely had on the local ecosystem
If 6 grams of a hydrocarbon gas have a volume of
4.8 cubic decimeter, what would be the
approximate molecular mass of this gas?
A 30 grams
B 40 grams
C 20 grams
D 48 grams
Answer:
30 grams
Explanation:
I got 40 wrong so I picked 30
Answer:
30 grams
Explanation:
I did the ck12
student carries out a titration to determine the concentration of a solution of
nitric acid. She titrates the solution of nitric acid against a standard solution
of sodium hydroxide with a known concentration of 0.0998 mol/dm². She
finds that 21.80 cm of the nitric acid solution is needed to exactly neutralise
25.0 cm of the sodium hydroxide solution.
Calculate the concentration of the nitric acid solution. Give your answer to
three significant figures.
The equation for the neutralisation reaction is
HNO3 + NaOH → NaNO3 + H2O
The concentration of the Nitric acid solution : 0.114 M
Further explanationTitration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range
Titrations can be acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases
Reaction
HNO₃ + NaOH → NaNO₃ + H₂O
Concentration a standard solution of sodium hydroxide : 0.0998 mol/dm³ , and the volume = 25 cm³
moles NaOH=
[tex]\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles[/tex]
From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=2.495 mlmoles
The volume of HNO₃ = 21.8 cm³, so the concentration :
[tex]\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114[/tex]
The concentration of the nitric acid solution is 0.11445 mol/dm³
From the question,
We are to calculate the concentration of the nitric acid solution
The given balanced chemical equation for the reaction is
HNO₃ + NaOH → NaNO₃ + H₂O
This means 1 mole of HNO₃ is needed to completely neutralize 1 mole of NaOH
Using the formula
[tex]\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}[/tex]
Where [tex]C_{A}[/tex] is the concentration of acid
[tex]C_{B}[/tex] is the concentration of base
[tex]V_{A}[/tex] is the volume of acid
[tex]V_{B}[/tex] is the volume of base
[tex]n_{A}[/tex] is the mole ratio of acid
[tex]n_{B}[/tex] is the mole ratio of base
From the given information
[tex]C_{B}= 0.0998\ mol/dm^{3}[/tex]
[tex]V_{A} = 21.80 \ cm^{3}[/tex]
[tex]V_{B} = 25.0 \ cm^{3}[/tex]
From the balanced chemical equation
[tex]n_{A} = 1[/tex]
[tex]n_{B} =1[/tex]
Putting the parameters into the formula, we get
[tex]\frac{C_{A} \times 21.80 }{0.0998 \times 25.0} = \frac{1}{1}[/tex]
Then,
[tex]C_{A} \times 21.80=0.0998 \times 25.0[/tex]
∴ [tex]C_{A}=\frac{0.0998 \times 25.0}{21.80}[/tex]
[tex]C_{A} =\frac{2.495}{21.80}[/tex]
[tex]C_{A} = 0.11445 \ mol/dm^{3}[/tex]
Hence, the concentration of the nitric acid solution is 0.11445 mol/dm³
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Label each of the following properties of sulfur as either á physical or chemical property.
Use the definition of a physical property and chemical property to back up your answer.
1. It reacts with hydrogen when heated
2. It is a yellow solid at room temperature
3. It is soluble in carbon disulfide
4. Its density is 2.97 g/cm3
5. It melts at 113°C
Answer:
Explanation:
1. It reacts with hydrogen when heated
Chemical property
2. It is a yellow solid at room temperature
Physical property
3. It is soluble in carbon disulfide
Chemical property
4. Its density is 2.97 g/cm3
Physical property
5. It melts at 113°C
Physical property
Physical properties tells us everything about what substance is when no change is occurring to its constituents.
It can be observed using apparatus and instruments. Examples are state of matter, color, odor, taste, texture, hardness, solubility in water, density, melting point and boiling point
Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances. Examples are flammability, rusting of irons, precipitation, decomposition of water by an electric current.
Select the correct answer.
What are the oxidizing agent and the reducing agent in this chemical equation?
3FeS + 8HNO3 → 3FeSO4 + 8NO + 4H2O
A.
FeS is the oxidizing agent, and HNO3 is the reducing agent.
B.
HNO3 is the oxidizing agent, and NO is the reducing agent.
C.
FeS is the reducing agent, and HNO3 is the oxidizing agent.
D.
HNO3 is the reducing agent, and NO is the oxidizing agent.
Answer:
Its answer choice C
An object has a momentum of 5 kg m/s and a mass of 2 kg. How fast is it moving?
Answer:
2.5 meter per second
Explanation:
momentum = mass multiplied by velocity
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What is the main product of cellular
respiration?
Answer:
The main products are ATP, carbon dioxide, and water.
Which answer correctly identifies the five levels of cell organization from simple to most complex A-bone cell, bone tissue, femur, skeleton, dog B-dog, skeleton, femur, bone tissue, bone cell C-bone tissue, dog, bone cell, femur, skeleton
Answer:
A-bone cell, bone cell C-bone tissue, bone cell bone tissue, femur, skeleton, dog B-dog.
Explanation:
It is ordered from the smallest unit (tissue microstructure) to a tissue or organ that are considered macrotisular structures.
If someone gave you flour, sugar, butter, eggs, baking soda, and salt, what could those ingredients turn into?
Answer:
You can make Cake CAke Cake Cake and other stuff too Ig
Explanation:
hello can u answer these quickly?
1- If element X has 6 protons. How many electrons does it have? ______
2- If element Y has 10 protons. What is its atomic number? ______
3- If element Z has 15 protons & 17 neutrons. What are its number of electrons, atomic number & mass number? ____________
4- If element A has 7 electrons & 9 neutrons. How many protons does it have? And what is its atomic number? ____________
1- If the atomic number of an element is 15 & its mass number is 31? How many protons & neutrons does this element have? _______
2- If element B has 9 electrons. Find the number of protons & atomic number. ______________
3- If the mass number of element A is 60 & number of neutrons is 33. Find its number of protons & its atomic number. ______________
Answer:
1. 6electrons because in an a neutral atom, the number of electrons and protons are equal
2. Atomic number is 10
3. 15electrons, Atomic number 15,Mass number 32
4. 7protons, Atomic number 7
1. 15protons,16neutrons
2.Number of protons is 9, atomic number is 9
3.Number of protons is 27, Atomic number is 27
Explanation:
The mass number (A)=Atomic/proton number (Z)+Neutron number (N)
You find a ring with a mass of 89.2g. You fill a graduated cylinder up with 10mL of water
and put the ring into the cylinder. The water mark rises up to the 20mL mark. What is
the ring made of
Solids
Table of Densities
Density g/cm
Solids
2.56
Copper
264
Gold
Density g/cm
8.92
Marble
19.32
Diamond
3.52
Platinum
21.4
O Marble
O Quartz
Copper
Gold
Answer:
Ring is made up off copper.
Explanation:
Given data:
Mass of ring = 89.2 g
Volume of water = 10 mL
Volume of water + ring = 20 mL
Ring is made up of = ?
Solution:
Volume of ring = (Volume of water + ring) - Volume of water
Volume of ring = 20 mL - 10 mL
Volume of ring = 10 mL
Density:
Density = mass/volume ( 1 mL = 1 cm³)
d = 89.2 g/ 10cm³
d = 8.92 g/cm³
Thus, ring is made up off copper.
which graph above best represents the relationship between the volume and the pressure of a gas?
The graph (A) best represents the relationship between the volume and the pressure of a gas.
What is pressure?The force was applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. The relationship between pressure and volume can be understand with the aid of ideal gas law.
PV=nRT.
where, P is pressure, V is volume.
It can be seen that when temperature will kept constant then pressure will be inversely proportional to the volume. It can be shown as:
P ∝ 1/V.
Therefore, graph A represent relationship between pressure (P) and volume (V).
To know more about pressure.
https://brainly.com/question/14760196.
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can someone answer pls
If u like someone
how do u know if they like u back.
Answer:
The chemistry between you will be instant. Sometimes it may be hard to know if they like you back. Knowing that you can not live without them and that you bump in to each other everywhere you go, is fate at work. You might also just need the courage to ask them out. You never know what will happen if you try. :)
Answer:
You will feel it
Explanation:
2. Water is an example of a(n)
a. inorganic b. organic
compound.
d. none of these
c. carbon
it would be A ,inorganic Compound
Why do the electron clouds around a central atom stay as far apart as possible?
Electron pairs around a central atom arrange themselves so that they can be as far apart as possible from each other. The repulsion between negatively charged electrons pairs in bonds or as lone pairs causes them to spread apart as much as possible
Explanation:
In 2018, Micah Williams, of Benson High School, set the Oregon High School State Track meet record in the 100 meter dash by posting a time of 10.42 seconds. What was his average speed?
Answer:
Average speed = 9.59 m/s
Explanation:
Given data:
Distance = 100 m
Time taken = 10.42 s
Average speed = ?
Solution:
Formula:
Average speed = distance covered / time taken
by putting values,
Average speed = 100 m / 10.42 s
Average speed = 9.59 m/s
ОА
H+ HH
O H+ H → He
Oc He+
TH
Не
ODH +
Η
>
Ao H+HH OH
santa said he will eat shower curtian at 2 am
Calculate the molar mass of B(NO3)3 ?
The molar mass of B(NO₃)₃ - Boron nitrate : 196.822 g/mol
Further explanationIn stochiometry therein includes
Relative atomic mass (Ar) and relative molecular mass / molar mass (M)
So the molar mass of a compound is given by the sum of the relative atomic mass of Ar
M AxBy = (x.Ar A + y. Ar B)
The molar mass of B(NO₃)₃ - Boron nitrate :
M B(NO₃)₃ = Ar B + 3. Ar N + 9.Ar O
M B(NO₃)₃ = 10.811 + 3. 14,0067 + 9. 15,999
M B(NO₃)₃ = 196.822 g/mol
3Fe + 4H2O ‐----> Fe3O4 + 4H2
10 g of water vapour are passed on 16.8 g of iron which is heated till redness find the limiting reactant
The limiting reactant : Fe
Further explanationReaction
3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂
mass of H₂O = 10 g
mol H₂O (MW=18 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]
mass of Fe = 16.8 g
mol Fe(MW=56 g/mol) :
[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]
Limiting reactant : the smallest ratio between mol : reaction coefficient
Fe :
[tex]\tt \dfrac{0.3}{3}=0.1[/tex]
H₂O :
[tex]\tt \dfrac{0.56}{4}=0.14[/tex]
Fe as limiting reactant
A sample of silver metal contains 1.91 X 1021 atoms. How many moles of silver is
this?
Answer:
1.91×1021/6.023×10^23
Explanation:
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FIRST PERSON ANSWER GETS PTS, BRAINLIEST, And SUPRISE
Which has a higher melting point KF or KI?
Answer:
kf
Explanation:
A consequence of burning fossil fuels is
warming.
PLEASE I NEED HELP!!
You find a ring with a mass of 89.2g. You fill a graduated cylinder up with 10mL of water
and put the ring into the cylinder. The water mark rises up to the 20mL mark. What is
the ring made of?
Solids
Table of Densities
Density g/cm
Solids
2.56
Copper
2.64
Gold
3.52
Platinum
Density g/cm
8.92
Marble
Quartz
19 32
Diamond
214
O Marble
Quartz
Copper
Gold
Answer:
Ring is made up off copper.
Explanation:
Given data:
Mass of ring = 89.2 g
Volume of water = 10 mL
Volume of water + ring = 20 mL
Ring is made up of = ?
Solution:
Volume of ring = (Volume of water + ring) - Volume of water
Volume of ring = 20 mL - 10 mL
Volume of ring = 10 mL
Density:
Density = mass/volume ( 1 mL = 1 cm³)
d = 89.2 g/ 10cm³
d = 8.92 g/cm³
Thus, ring is made up off copper.
What characteristic do atoms in the same group of elements share?
1 - they have the same number
2 - they have similar physical property
3 - they have the same atomic mass
4 - the same number of electrons orbitals
Answer:
2 option
Explanation:
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