0.50 mol SiO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
30 g SiO₂ (sand)
Step 2: Identify Conversions
Molar Mass of Si - 28.09 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of SiO₂ - 28.09 + 2(16.00) = 60.09 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 30 \ g \ SiO_2(\frac{1 \ mol \ SiO_2}{60.09 \ g \ SiO_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.499251 \ mol \ SiO_2[/tex]Step 4: Check
Follow sig figs and round. We are given 2 sig figs.
0.499251 mol SiO₂ ≈ 0.50 mol SiO₂
Answer:
[tex]\boxed {\boxed {\sf About \ 0.5 \ moles \ of \ SiO_2}}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass.
1. Molar Mass
Use the Periodic Table to find the masses of the individual elements (silicon and oxygen) in sand.
Silicon (Si): 28.085 g/mol Oxygen (O): 15.999 g/molExamine the formula for sand: SiO₂. There is a subscript of 2 after oxygen, so there must be 2 oxygen atoms. Multiply oxygen's mass by 2 and add silicon's mass to find the molar mass of sand.
SiO₂: 2(15.999 g/mol) + 28.085 g/mol= g/mol2. Calculate Moles
Use the molar mass as ratio.
[tex]\frac{60.083 \ g \ SiO_2}{1 \ mol \ SiO_2}[/tex]
Multiply by the given number of grams (30)
[tex]30 \ g \ SiO_2 * \frac{60.083 \ g \ SiO_2}{1 \ mol \ SiO_2}[/tex]
Flip the fraction so the grams of sand will cancel.
[tex]30 \ g \ SiO_2 *\frac{1 \ mol \ SiO_2}{60.083 \ g \ SiO_2}[/tex]
[tex]30 *\frac{1 \ mol \ SiO_2}{60.083 }[/tex]
[tex]\frac{30 \ mol \ SiO_2}{60.083 }[/tex]
[tex]0.499309289 \ mol \ SiO_2[/tex]
3. Round
The original measurement of grams has 1 signfiicant figure. We must round our answer to 1 sig fig.
For the answer we found, that is the tenth place. The 9 in the hundredth tells us to round the 4 to a 5.
[tex]\approx 0.5 \ mol \ SiO_2[/tex]
There are about 0.5 moles of SiO₂ in 30 grams.
Which are reasons to create a study schedule? Check all that apply.
to prevent scheduling conflicts
to help meet deadlines
to study more efficiently when tired
to maintain a consistent schedule
to set aside enough time for studying
Mark this and return
Answer - A, B, D, E
to prevent scheduling conflicts
to help meet deadlines
to maintain a consistent schedule
Can someone help me with these two questions
Please help
I will give a brainliest
THe correct answer is heat
Answer:
hi
Explanation:
heat
Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.
Answer:
Chemical Energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Chemical energy is converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's engine.
MARK BRAINLIST PLZ NEEDS ONE MORE
Explanation:
3. The two main driving forces of the water cycle are the Sun and...
1 gravity
2 wind
3 volcanoes
4 rain
1. What happens when an electric current is applied to a tube filled with a gas, like neon, electrons...
Answer:
When an electric current is passed through a gas, the gas emits light. Neon signs operate in this way; a tube having an electrode at each end is filled with a gas at low pressure and a high voltage (generally in the range of 1000 to 5000 volts) is applied to the electrodes.
Explanation:
Please help quick
1) How much heat does 23.0 g of water absorb as its temperature increases from 25.4 °C to 42.8 °C?
2) A sample of unknown metal has a mass of 120.7 g. As the sample cools from 90.5 °C to 25.7 °C, it releases 7020 J of energy. What is the specific heat of the sample?
Answer:
c = 0.898 J/g.°C
Explanation:
1) Given data:
Mass of water = 23.0 g
Initial temperature = 25.4°C
Final temperature = 42.8° C
Heat absorbed = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Specific heat capacity of water is 4.18 J/g°C
ΔT = 42.8°C - 25.4°C
ΔT = 17.4°C
Q = 23.0 g × × 4.18 J/g°C × 17.4°C
Q = 1672.84 j
2) Given data:
Mass of metal = 120.7 g
Initial temperature = 90.5°C
Final temperature = 25.7 ° C
Heat released = 7020 J
Specific heat capacity of metal = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 25.7°C - 90.5°C
ΔT = -64.8°C
7020 J = 120.7 g × c × -64.8°C
7020 J = -7821.36 g.°C × c
c = 7020 J / -7821.36 g.°C
c = 0.898 J/g.°C
Negative sign shows heat is released.
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Answer:
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
Explanation:
The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch
and carotid arteries. These send impulses to either the cardioaccelerator or
cardioinhibitor center in the hypothalamus of the brain, which in turn sends an
impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a
feedback diagram to illustrate what happens to restore homeostasis when blood CO2
rises.
How many valence electrons must Calcium lose when forming an ionic compound with Bromine?
Answer:
2
Explanation:
Describe the processes that have led to the formation of the soufriere hills volcano
Answer:
The Soufriere Hills volcano has formed where magma is actively seeping up from the mantle to the surface. Soufriere Hills volcano is part of an island chain that formed at the boundary where two oceanic plates converge. One plate subducts beneath the plate with the island chain, and the subducting plate melts in the mantle and creates magma that rises and fuels the Soufriere Hills volcano.
Explanation:
Bohr's model of the atom attempts to explain the idea that
the atom is mostly empty space
O all atoms of one type of element are identical
O energy is quantized
O protons and neutrons are found in the nucleus
Answer:
O energy is quantized
Explanation:
Bohr's model of that atom attempts to explain the idea that energy is quantized within an atomic space.
In 1913 Neils Bohr put forward his own model of the atom based on the quantum mechanics developed by Planck. He suggested that the extranuclear part consists of electrons in specific spherical orbits around the nucleus. As one moves outwards from the nucleus the energy level increases.Balance the following chemical equation by providing the correct coefficients.
Na + H2O ———— NaOH+H2
Please help!!!!!!!!
Answer:
2, 2, 2, and 1
Explanation:
I put that in and it was correct.
A vector is a quantity with magnitude and ____
Answer:
direction
Explanation:
A P E X
Suppose the body is projected from the ground at 24.5 m/s, 60* above the horizontal. Find the (a) time of flight, (b) range, and (c) maximum height.
helppppppp (ᗒᗣᗕ)՞
a. t = 4.33 s
b. R = 53.04 m
c. H = 22.97 m
Further explanationGiven
vo=initial velocity=24.5 m/s
Angle = θ = 60°
Required
(a) time of flight, (b) range, and (c) maximum height.
Solution
Parabolic motion
a. time to flight
t = (2vo sin θ) / g
t = (2 x 24.5 x sin 60) / 9.8
t = 4.33 s
b. range (horizontal range) :
R = (vo² sin2θ )/g
R =(24.5² sin 120)/9.8
R = 53.04 m
c. maximum height
H = (vo²sin²θ)/2g
H = (24.5²sin²60)/2.9.8
H = 22.97 m
The article states that amplitude plays a role in what happens to a sound
wave. Why do you think higher amplitude waves are more often
transmitted while lower amplitude waves are reflected or absorbed?
Answer:
Sound waves travel through matter
Explanation:
Higher amplitude sound waves are more likely to be transmitted through matter instead of reflected. Lower amplitude sound waves are more likely to be reflected or absorbed, resulting in a lack of an echo. Sound can travel through air, water, and solids
Which equation is balanced in an acidic solution?
Answer:
I think C but it could be D
Explanation:
I would say go for C
1pt Twins raised in different families still exhibit similar mannerisms, indicating that at least some behavior is
O A. genetis
OB. environmental
O C. instinctual
OD. learned
I will need help plz thank you
The Earth's surface is _____ water.
50 %
71 %
97 %
Answer:
71%
Explanation:
A model that describes the formation, ______________, and reformation of rocks.
What is the percent composition of nitrogen in N 2 O
Answer:
28 %
Explanation:
Mass mass N2O = 28 + 16 = 44 mass nitrogen = 2 x 14 = 28 % nitrogen Chemistry.
Newton wrote the mathematical concepts to prove the _____ shape of planet’s orbits.
spherical
circular
triangular
elliptical
Answer:
Eliptical
Explanation:
While some orbits may seem circular, like Earth's, it is still an ellipse. Planets orbit stars in an elliptical shape, but some come very close to perfect circles. As for the other two, im certain you have never seen a triangular or spherical orbit. Hope this helps.
Balance the Chemical Equations
Rb + RbNO3---> Rb2O + N2
please help me
Answer:
10Rb° + 2RbNO₃ => 6Rb₂O + N₂
Explanation:
Given: Rb° + RbNO₃ => Rb₂O + N₂
=> 1st balance rubidium in RbNO₃ against Rb₂O by inserting a '2' coefficient before RbNO₃ and a '6' coefficient before Rb₂O
=> Rb° + 2RbNO₃ => 6Rb₂O + N₂ => Oxygen and Nitrogen are balanced. All that remains is balancing Rb by inserting a '10' coefficient.
=> 10Rb° + 2RbNO₃ => 6Rb₂O + N₂
Note: In balancing chemical equations, saving an element that is not part of a compound until last frequently gives balance by inspecting the number of elements of the specific kind and boosting its coefficient to balance the equation.
Balanced equation => 10Rb° + 2RbNO₃ => 6Rb₂O + N₂
The balanced chemical reaction can be of the equation given is [tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex].
We need to make sure that the amount of atoms of each element is the same on both sides of the equation in order to balance the chemical equation [tex]Rb + RbNO_3- > Rb_2O + N_2[/tex].
By counting the atoms in each element, we may begin to balance the equation. We have one Rb, one Rb, one N, and three O atoms on the left side. We have two Rb, one N, and two O atoms on the right side.
We can add a coefficient of 2 in front of [tex]RbNO_3[/tex] to balance the Rb atoms, which gives us:
[tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex]
Thus, now, the equation is balanced with two Rb atoms on both sides.
For more details regarding chemical reaction, visit:
https://brainly.com/question/34137415
#SPJ6
If we react 5.4g of sodium chloride with an unknown amount of fluorine gas, we produce 4.9g of sodium fluoride and 3.7g chlorine gas. How much fluorine was consumed in the reaction?
Answer:
4.43 g
Explanation:
The reaction between sodium chloride and flourine gas is given as;
NaCl + F2 --> NaF + Cl2
From the stochiometry of the equation;
1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2
Mass of 1 mol of F2 = 38g
Mass of 1 mol of sodium flouride, NaF = 42g
This means 38g of flourine reacted with NaCl to form 42g of NaF
xg of F2 would form 4.9g of NaF
38 = 42
x = 4.9
x = 4.9 * 38 / 42
x = 4.43 g
at stp what is the volume of 5.35 moles of methane ch4
Answer:
22.4 L
Explanation:
What patterns do you notice between the three maps? Using the concepts
you've learned in this lesson, construct an explanation for these patterns in your
Science Notebook or in the space below.
Answer:
A spatial pattern is a perceptual structure, placement, or arrangement of objects on Earth. It also includes the space in between those objects. Patterns may be recognized because of their arrangement; maybe in a line or by a clustering of points.
Explanation:
How many atoms of beryllium are equal to 0.39 moles of beryllium?
Answer:
2.35 x 10²³atoms
Explanation:
Given parameters:
Number of moles of Be = 0.39moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem:
1 mole of a substance contains 6.02 x 10²³ atoms
0.39 mole of Be will contain 0.39 x 6.02 x 10²³ = 2.35 x 10²³atoms
The diagram below shows the apparatus used to pass a current through copper
sulfate solution.
1 x
Positive electrode
Negative electrode
Copper sulfate solution
What is the name of component X in the diagram above?
point
Fuse
Switch
оооо
Ammeter
O Battery
i think the answer is b) i.e. Switch....
according to me ammeter and battery are already there...
How can calcium oxide change directly to limewater?
Wants equation and observation
Answer:
Lime(Calcium Oxide) is a white solid with strongly basic properties.Lime reacts readily with water to produce slaked lime,which is the chemical compound calcium hydroxide.....
When carbon dioxide gas is passed through or over limewater,it turns milky due to the formation of calcium carbonate.
A closed container is the best way to measure the volume of a
A. gas
B. liquid
C. solid
D. Both A and B are correct.
Answer:
A closed container is the best way to measure the volume of a liquid
What does the salinity of seawater represent?
The concentration of salt dissolve in the ocean
The concentration of all dissolved chemicals in the ocean
The volume of salt in the ocean
the mass of salt in the ocean
Answer:
Salinity is a measure of the 'saltiness' of seawater, or more precisely the amount of dissolved matter within seawater.
