Answer:
Amount = 0.0027 mol
Explanation:
The molecular formula of vitamin C is: C₆H₈O₆. Therefore, its molar mass will be:
Molar Mass = 6(Mass of carbon) + 8(Mass of Hydrogen) + 6 (Mass of Oxygen)
Molar Mass = 6(12 g/mol) + 8(1 g/mol) + 6(16 g/mol)
Molar Mass = 176 g/mol
Molar Mass = 176000 mg/mol
Now, for the amount of Vitamin C in 1 tablet
Amount = Mass of Tablet/Molar Mass
Amount = (475 mg)/(176000 mg/mol)
Amount = 0.0027 mol
Which of the following terms best reflects the process by which humans store memories ?
Answer:
there are no term
Explanation:
what are the term
We can see water change state, from ice to steam. This is a ———-
change in matter.
A)
chemical
B)
combustion
C)
physical
D)
solubility
Answer:
C
Explanation:
its physical change.
What makes metals, in particular, good conductors of electricity?
A.
the ability of electrons to flow throughout the metal
OB.
the absence of charged particles
O c.
the high temperatures required to break metallic bonds
D.
the presence of positive and negative ions
Answer: I believe the answer is A
Something used to represent a complex idea or process in science is a what
Answer:
a model?
Explanation:
im not sure! i think so
Answer:
Yes, It is a model
Explanation:
A complex idea or a process can be demonstarated by using a Model because you can see things easier and its basically a copy of anything from forests to volcanoes but smaller to make it easier to see.
Hope This Helps
If you weigh 118 lbs, how many kilograms is this
Answer:
the answer is 53.524 kg
Students want to gather evidence for the claim that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction. They decide to react vinegar and baking soda in a sealed plastic bag. Which of the following would provide evidence the students need
Answer:
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Explanation:
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, the reaction shows the law of conservation of mass.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier.
Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved. The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Therefore, the reaction shows the law of conservation of mass.
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Question 3 of 8
Which two characteristics are needed to describe a force?
A. Direction
B. Speed
C. Resistance
D. Size
SUBT
Answer:A. Direction
C. Resistance
Explanation:
Forces are due to an interaction of at least two objects. It may change the state of motion of an object. It may change the shape of an object. Forces applied on an object in the same direction add to one another and the resultant is in the same direction.
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You add 168.90 grams of NaCl to a container and then you add 616.00 grams of water to that same container What is the weight percent of NaCl in the containerI
Answer:
The weight percent of NaCl in the container is 21.5%
Explanation:
Given that,
Mass of NaCl = 168.90 gram
Mass of water = 616.00 grams
We need to calculate the weight percent of NaCl in the container
Using formula of percentage of weight
[tex]weight\ \%\ of\ component\ of\ the\ solution =\dfrac{weight\ of\ the\ component\ in\ the\ solution}{total\ weight\ of\ the\ solution}\times100[/tex]
Put the value into the formula
[tex]weight\ \%\ of\ component\ of\ the\ solution =\dfrac{168.90}{168.90+616.00}\times100[/tex]
[tex]weight\ \%\ of\ component\ of\ the\ solution=21.5\%[/tex]
Hence, The weight percent of NaCl in the container is 21.5%
A protein was previously determined to contain 16.2 wt% nitrogen. A 691 μL aliquot of a solution containing the protein was digested in boiling sulfuric acid. The solution was made basic and the liberated NH3 was collected in 10.00 mL of 0.0390 M HCl . A volume of 4.16 mL of 0.0155 M NaOH was required to react with the excess, unreacted HCl . Calculate the protein concentration of the solution in units of milligrams per milliliter.
Answer:
6.60mg N / mL
Explanation:
All nitrogen is converted in NH₃ that react with the HCl, thus:
NH₃ + HCl → NH₄⁺ + Cl⁻
In the problem, the excess of HCl reacts with NaOH, thus:
HCl + NaOH → NaCl + H₂O
The moles of NaOH = Moles of HCl in excess is:
4.16mL = 4.16x10⁻³L * (0.0155mol / L) = 6.448x10⁻⁵mol HCl in excess
Initial moles of HCl are:
10x10⁻³L * (0.0390mol / L) = 3.9x10⁻⁴moles HCl
That means the moles of HCl that reacts = Moles of NH3 = Moles of N are:
3.9x10⁻⁴ moles - 6.448x10⁻⁵moles = 3.2552x10⁻⁴ moles N.
To convert these moles to grams we need to use molar mass of N = 14.01g/mol:
3.2552x10⁻⁴ moles N * (14.01g/mol) = 4.56x10⁻³g * (1000mg / g) =
4.56mg of N
And volume in mL is:
691 μL * (1mL / 1000μL) = 0.691mL
Concentration in milligrams per mililiter is:
4.56mg N / 0.691mL =
6.60mg N / mLhow many moles of tin (II) fluoride will be produced if 22.9 grams of hydrogen fluoride react
Answer:
From 22.9 g of HF 0.575 moles of tin(II) fluoride are produced.
Explanation:
Given data:
Moles of tin(II) fluoride produced = ?
Mass of hydrogen fluoride react = 22.9 g
Solution:
Chemical equation:
SnO + 2HF → SnF₂ + H₂O
Number of moles of HF:
Number of moles = mass/ molar mass
Number of moles = 22.9 g/ 20 g/mol
Number of moles = 1.15 mol
Now we will compare the moles of SnF₂ with HF.
HF : SnF₂
2 : 1
1.15 : 1/2×1.15 = 0.575 mol
Thus, from 22.9 g of HF 0.575 moles of tin(II) fluoride are produced.
the valency of nitrogen is 3 . Give reason
Answer:
The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.
Be sure to answer all parts. Consider the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g)ΔH = −198.2 kJ/mol How would the concentrations of SO2, O2, and SO3 at equilibrium change if we were to (a) increase the temperature? [SO2]: The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change. [SO3]: The concentration increases. The concentration decreases. There is no change. (b) increase the pressure and decrease the volume? [SO2]: The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change. [SO3]: The concentration increases. The concentration decreases. There is no change. (c) add a catalyst? [SO2]: The concentration increases. The concentration decreases. There is no change. [O2]: The concentration increases. The concentration decreases. There is no change. [SO3]: The concentration increases. The concentration decreases. There is no change.
Answer:
a)
[SO2]: The concentration increases
[O2]: The concentration increases.
[SO3]: The concentration decreases.
b)
[SO2]: The concentration decreases.
[O2]: The concentration decreases.
[SO3]: The concentration increases.
c)
[SO2]:There is no change.
[O2]: There is no change.
[SO3]: There is no change
Explanation:
For an exothermic reaction, increase in temperature decreases the concentration of products and increases the concentration of reactants since increase in temperature shifts the equilibrium position to the left hand side.
Increase in pressure and decrease in volume will shift the equilibrium position towards the right hand side which means more SO3 in the system.
Catalyst increases the rate of forward and reverse reaction simultaneously hence at equilibrium, the concentration of reactants and products remain unchanged.
Help me please answer this with solution....A piece of granite weighing 250g is heated in a boiling water to 100°C. When a granite is place in a calorimeter containing 400g water, the temperature of the water increases from 20°C to 28.5°C. What is the specific heat of the granite, assuming all the heat is transferred to the water?
The specific heat capacity of the granite is 0.796 J/gºC
We'll begin by calculating the heat absorbed by the water. This can be obtained as follow:
Mass of water (M) = 400 g
Initial temperature of water (T₁) = 20 °C
Final temperature (T₂) = 28.5 °C
Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 20 = 8.5 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat absorbed (Q) =?Q = MCΔT
Q = 400 × 4.184 × 8.5
Q = 14225.6 JThus, the heat absorbed by the water is 14225.6 J
Finally, we shall determine the specific heat capacity of the graniteHeat absorbed = Heat released
Heat absorbed = 14225.6 J
Heat released = –14225.6 JMass of granite (M) = 250 g
Initial temperature of granite (T₁) = 100 °C
Final temperature (T₂) = 28.5 °C
Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 100 = –71.5 °C
Specific heat capacity of granite (C) =?Q = MCΔT
–14225.6 = 250 × C × –71.5
–14225.6 = –17875 × C
Divide both side by –17875
C = –14225.6 / –17875
C = 0.796 J/gºCTherefore, the specific heat capacity of the granite is 0.796 J/gºC
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adding hot water to your cold bath water is
conduction
convection
radiation
Answer:convection
Explanation:
Answer: B. Convection
Explanation: I hope this helps! :)
Enter the cycle number, n, in the x column and the number of radioactive atoms in the y column. When you finish, resize the window.
An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be
If it loses 2 electrons, the net charge on the atom will be 2. You should first see if the question is already answered next time.
three students measured the volume of water with three different devices they report the volumes
large cylinder 164 ml
small cylinder 39.7 ml
calibrated buret 18.16 ml
if they pour it into a single container what is the volume
Answer:
The total volume of water is 222 ml.
Explanation:
Given that,
Volume of water by different devices are,
First large cylinder =164 ml
Second small cylinder = 39.7 ml
Third calibrated burette = 18.16 ml
We need to calculate the total volume of water
Using given data
volume of total water=volume by large cylinder+volume by small cylinder+volume by calibrated burette
Put the value into the formula
[tex]V_{w}=164+39.7+18.16[/tex]
[tex]V_{w}=221.8\approx 222\ ml[/tex]
Hence, The total volume of water is 222 ml.
Which of the following could result from a substance that undergoes a physical change
Answer:
B. It undergoes phase change.
Explanation:
why is earth often referd as a blue planet ?
A-When viewed from space, the biosphere always looks blue.
B-Most people like blue.
C-The sky is blue.
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
NEED ANSWER ASAP
Answer:
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
Explanation:
What is the mass of a single atom, which is approximately equal to the total mass of the protons and neutrons in an atom called?
Answer:
Mass number or relative atomic mass number.
helpppp in a chemical equation, in which direction does the "yields" arrow point, and what factor does it indicate?
It points to the left, toward the reactants.
It points to the left, toward the products.
It points to the right, toward the reactants.
It points to the right, toward the products.
Answer:
It points right, towards the reactants
Explanation:
In a chemical equation, the arrow indicating the yield is to the right towards the arrow. The reactants are written in the left side and the product are written in the right side.
What is a chemical equation?A chemical equation represents the reaction between two or more elements or compound. The reaction describes the chemical combination between atoms.
A general chemical equation representing a chemical reaction is written below:
A + B ⇒ C.
Here, A and B are reactants and C be the product.
The yield of a reaction is the amount of product obtained. The theoretical yield might differ from the actual yield. Therefore, the arrow of a reaction points to the right towards products.
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Enter the symbol of a sodium ion, Na+
N
a
+
, followed by the formula of a sulfate ion, SO42−
S
O
4
2
−
. Separate the ions with a comma only—spaces are not allowed.
Express your answers as ions separated by a comma.
Answer:
Na⁺,SO₄²⁻
Explanation:
Sodium sulfate is formed by the sodium and sulfate ion.
Sodium is present in group one thus it has only one valence electron. Sodium lose its one valence electron to get complete octet and thus form cation with +1 charge.
On other hand sulfate ion is an anion it carries -2 charge so when it react with sodium there are two sodium atom combine with one sulfate ion inorder to make the compound neutral.
2Na + SO₄²⁻ → Na₂SO₄
Sodium sulfate is actually form when sodium react with sulfuric acid and hydrogen gas is liberated.
Chemical equation:
Na + H₂SO₄ → Na₂SO₄ + H₂
Balance chemical equation:
2Na + H₂SO₄ → Na₂SO₄ + H₂
7. Baking soda is a common household chemical compound. The chemical formula
NaHCO3 represents the matter needed to produce baking soda. Baking soda is
considered a compound because. WILL GIVE BRAINLIST
pls help me with this!!
Answer:
B. 65
Explanation:
arrange your numbers as:
63,64,66,69
add 64 and 66 together to get 130 then divide by 2
-or just think about what number is between 64 and 66
3. True or False. A compound is formed when two or more elements are
False
True
which of the substances created a chemical change
Answer:
It is one and two
Explanation:
When you burn something it lights up
Define energy transformation.
Answer:
Enery transformation is when a forn of energy changes into another.
Explanation:
An example of this would be a lamp. The lamp gets its energy through electricity. This electricity is later turned into light energy. Electrical energy to light evegy.
PLEASE HELP IMMEDIATELY
Which statement best describes how nearly all rock is formed?
A. Soil gradually hardens beneath Earth's surface
B. A different type of rock is broken down or changes in
in some way
C. Fire, water, or air cools into layers of rock
D. A mixture of minerals separates into several pure minerals.
Answer:
B
Explanation:
The rock cycle is a series of processes that create and transform the types of rocks in Earth’s crust. A different type of rock is broken down or changes in some way. The correct option is B.
What are types of rocks?Sedimentary, igneous, and metamorphic rocks are the three main categories of rocks. Each of these rocks is the result of physical processes that are a part of the rock cycle, such as melting, cooling, eroding, compacting, or deforming.
Rock fragments from other types of existing rocks or organic material are used to create sedimentary rocks. Clastic, organic (biological), and chemical sedimentary rocks are the three different types of sedimentary rocks.
Rocks that have undergone extreme heat or pressure and changed from their initial state are known as metamorphic rocks. When molten, heated material cools and solidifies, igneous rocks are created (their name is derived from the Latin word for fire).
Thus the correct option is B.
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What are two ways nitrogen fixation occurs
Explanation:
natural process
biological fixation
What are the physical properties of chlorine?
Answer:
The Physical Properties of Chlorine are as follows:
Color: Greenish-yellow.
Phase: Gas.
Odor: Disagreeable, suffocating smell.
Density: About two and one-half times as dense as air.
Solubility: Is soluble in water. ...
Boiling Point: The boiling point of chlorine is –34.05°C.
Melting Point: The melting point is –101°C.
Explanation:
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