Answer:
8
Explanation:
Calculate the mass percent of 0.389 g of silicon (Si) that reacts with oxygen to form 0.832 g silicon dioxide (SiO 2 )
Answer:
Mass percent of silicon = 46.75% (Approx)
Explanation:
Given:
Mass of silicon = 0.389 g
Mass of silicon dioxide = 0.832 g
Find:
Mass percent of silicon
Computation:
Mass percent of silicon = Mass of silicon / Mass of silicon dioxide
Mass percent of silicon = [0.389 g / 0.832 g]100
Mass percent of silicon = 46.75% (Approx)
Elements of the same subgroup have the same number of electrons on the outer layer. Am i right?
Answer:
yes
Explanation:
because they have similar chemical properties
ANSWER ASAP PLEASE
Ball 1 has a mass of 10 g. Ball 2 has a mass of 30 g. Which prediction tells how
gravity will act on the balls when dropped?
O
A. The pull of gravity will be greater on ball 1.
B. The pull of gravity will be greater on ball 2.
C. The pull of gravity will be the same on each ball.
O
D. The pull of gravity will not act on either ball.
Answer:
c
Explanation:
i rememer this from 3rd grade
what is the median number of seeds that germinate at 32
Answer:65
Explanation:
What is the mass number of this atom ?
What is the charge of an atom that has 6 protons, 4
neutrons, and 6 electrons?
Answer:
neutral/no charge
Explanation:
Which formula is an ionic compound?
CO2
NaF
N2
NO2
Answer:
def CO2
Explanation:
hellllpppppppp mee plzzzzzzzxzzzxzxzzzzzxx
Is mass conserved when neutralisation takes place? That is, is the total mass of the acid and alkali equal to the total mass of
the products, salt and water?
Answer:
Yes
Explanation:
yes, this is in every chemical reaction (except nuclear reaction) and Is known as "law of conservation of mass"
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which sample is a pure substance
a. a test tub of zinc oxide
b. a container of zinc and oxygen
c. A flask of Pondwater
d. A jar of soil
Draw the Lewis structure for the ClO3- ion on paper. How many valence electrons are found in the ion
Answer:
25 valence electrons.
Explanation:
Hello!
In this case, based on the attached picture, you can see that the chlorate ion has three oxygen atoms and one chlorine ion, whereas you can see there is a coordination bond (two arrows) from chlorine to oxygen which means that oxygen receives two electrons from chlorine in order to complete its octet and to allow chlorine to not exceed the octet. It means there is another oxygen completes its octet via the Cl=O bond and the the last oxygen is negatively charged because it is missing one bond to attain its octet even thought chlorine actually completes its octet.
Therefore, this ion has seven valence electrons from chlorine and 18 valence electrons from the three oxygen atoms, which means it has 25 valence electrons overall.
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If 30.0 g of H2SO4 reacts with sodium hydroxide, what mass of water is produced?
11.02g
Explanation:
mole ratio between H2SO4 and water is 1:2
mole of H2SO4 is 0.306
then the mole of water is 0.612
finally the mole of water is multiplied by 18, the molar mass to get 11.02 g of water
what the type of solid materials are typically hard, have high melting pionts and poor electrical conductivities
Answer:
Ionic solids
Explanation: Ionic solids—Made up of positive and negative ions and held together by electrostatic attractions. They're characterized by very high melting points and brittleness and are poor conductors in the solid state. An example of an ionic solid is table salt, NaCl.
Answer:
Ionic solids
Explanation:
g For a given arrangement of ions, the lattice energy increases as ionic radius ________ and as ionic charge ________.
Answer:
as the charge of the ions increases, the lattice energy increases. as the size of the ions increases, the lattice energy decreases.
For a given arrangement of ions, the lattice energy increases as ionic radius decreases and as ionic charge increases.
What is ion?An atom or molecule is said to be an ion if one or more of whose valence electrons have been acquired or lost, providing it a net negative or positive electrical charge.
Faraday knew that metals disintegrated together into solution place at a single electrode and that a second metal was placed first from solution at the opposite electrode, as such matter had to be trying to move underneath the impact of an electrical current even though he was unable to identify the particles trying to move between the electrodes. For a given arrangement of ions, the lattice energy increases as ionic radius decreases and as ionic charge increases.
Therefore, for a given arrangement of ions, the lattice energy increases as ionic radius decreases and as ionic charge increases.
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two atoms bonded together will remain some distance apart minimizing the A. Number of valence electrons in the bond. B. Potential energy of the bond. C.partial charge of the bond D.bond distance
Answer:
Answer is the number of the c
The value of ΔH° for the reaction below is -336 kJ. Calculate the heat (kJ) released to the surroundings when 23.0 g of HCl is formed. CH4(g) + 3Cl2(g) → CHCl3(l) + 3HCl(g)
The heat (kJ) released to the surroundings : -70.56 kJ
Further explanationReaction
CH₄(g) + 3Cl₂(g) → CHCl₃(l) + 3HCl(g) ΔH°=-336 kJ
For 3 mol HCl formed ⇒ ΔH°=-336 kJ
23.0 g of HCl :
mol[tex]\tt \dfrac{23}{36.5}=0.63[/tex]
Heat released for 0.63 mol HCl :
[tex]\tt \dfrac{0.63}{3}\times -336=-70.56~kJ[/tex]
The heat (kJ) released to the surroundings at the given equation is 70.7KJ.
The calculation is as follows:We know that
[tex]Moles\ or\ HCl\ formed = mass \div molar\ mass\\\\= 23.0\div 36.46[/tex]
= 0.631 mole
Since energy should be related at the time when 3 moles of HCI should be generated = 336 K
Now energy released is
[tex]= (336\div 3)\times 0.631[/tex]
= 70.65 kJ
Hence we can conclude that heat released to the surrounding is 70.7 kJ.
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what is the molarity of an HCI solution if 25.0 ml of 0.185 M NaOH is required to neutralize 0.0200 L of HCI?
Answer:
Molarity of HCl solution = 0.25 M
Explanation:
Given data:
Volume of NaOH= V₁ = 25.0 mL (25/1000 = 0.025 L)
Molarity of NaOH solution=M₁ = 0.185 M
Volume of HCl solution = V₂ = 0.0200 L
Molarity of HCl solution = M₂= ?
Solution:
M₁V₁ = M₂V₂
0.185 M ×0.025 L = M₂ × 0.0200 L
M₂ = 0.185 M ×0.025 L / 0.0200 L
M₂ = 0.005M.L /0.0200 L
M₂ = 0.25 M
How many electrons are gained in the half-reaction 02 + electrons → 2029
A. 2
B. 1
C. 0
D. 4
Answer:2
Explanation:
He
If there is a total of 100J of
energy in a system and 40 of energy is kinetic,
how much potential energy is there
Answer:
60j because 100-60=40j
Cardinals are birds that do not migrate but spend the winter in New York State. Many people feed these birds sunflower seeds during the winter months. the starches present in the sunflower seeds help the cardinals to survive. Identify the building blocks of starches
Answer:
simple sugar
Explanation:
The northern cardinal is a bird of the Cardinalis genus. It s also called as the red bird. It is mostly found in Canada, United states and parts of Texas and Mexico. The Cardinal birds do not migrate in winter and spends the winter season in New York. These birds are fed with sunflower seeds by the people during the winter season. The starches in the seeds of the sunflower helps these birds to survive in the winter. The glucose or the simple sugar found in the starches are the building blocks of the starches.
Value representing the number of protons in an atom
Answer:
6
Explanation:
How many liters of volume is one mole of gas at standard temperature and
pressure?
22.7 liters
The molar volume of an ideal gas depends on the temperature and pressure. One mole of any ideal gas occupies 22.7 liters at 0 0C and 1 bar (STP).
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How to atoms share more than one pair of electrons?
Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
More than one pair of electrons can be shared between atoms to form double or triple covalent bonds. Unlike ionic bonds, covalent bonds are often formed between atoms where one of the atoms cannot easily attain a noble gas electron shell configuration through the loss or gain of one or two electrons.
Analyze how water affects mass movements by using two examples of mass
movement.-
Answer:
Types Descriptions
Flows occur when soil or rock acts like a liquid
Slumps a slice of material that moves as one piece along a curved surface
Landslides made up of unconsolidated rock; includes rockslides and avalanches
Creeps material that moves slowly down gently sloping areas
Explanation:
Googled it.
Water can affect mass movements by reducing the friction along a sliding surface and can also allow particles to slide past each other easily.
Mass movement refers to the transfer of rocks and solid downslope as a result of gravity. Mass movement is the relocation of surface material such as solid or rock from a point along a slope to a position that's further down the slope.
It should be noted that water triggers mass movement. This is done as water fills the pores that are in the sediments, this then allows the particles to slide past each other easily.
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Calculate the bond for CO2
Answer:
Bonding Order = number of bonding electrons – number of antibonding electrons/2.
So for CO2, there is a total of 16 electrons, 8 of which are antibonding electrons.
So 16 – 8 = 8; divided by 2 = 4. So, 4 is the bonding order of CO2. The molecular structure of CO2 looks like this:
..~-~~..
O=C=O
..~-~~..
Heptane (C7H16) is a hydrocarbon fuel used for gas barbecues. Balance the chemical equation (given below) for the reaction that occurs when heptane burns in air. What are the coefficients in the balanced equation
Answer:
a = 1, b = 11, c = 7, d = 8
Explanation:
aC7H16 + bO2 ------> cCO2 + dH2O
1 C7H16 + 11 O2 ------> 7 CO2 + 8H2O
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1.1
A sample of oxygen occupies 47.2 L under a pressure of 1240 torr at 25 °C. What
volume would it occupy at 25 °C if the pressure were decreased to 730 torr?
Answer:
80.2L
Explanation:
Given parameters:
Initial volume of oxygen = 47.2L
Initial pressure of oxygen = 1240torr
Final pressure = 730torr
Unknown:
Final volume = ?
Solution:
To solve this problem, we apply the Boyle's law proposed by Robert Boyle. It states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".
Mathematically;
P₁V₁ = P₂V₂
P and V are pressure and volume
1 and 2 are initial and final states
1240 x 47.2 = 730 x V₂
V₂ = 80.2L
Winds move in the same direction in both southern and northern hemispheres.
Select one:
True
False
Answer:
your answer would be false.
Explanation:
prevailing winds blow east-west rather than north-south.
What is the parent chain name of the hydrocarbon below?
a. methane
b. heptane
c. hexane
d. ethane
e. butane
Answer:
Option B. Heptane
Explanation:
To obtain the parent name of the above compound, all we need to do is to locate the longest continuous carbon chain.
The longest continuous carbon chain of the above compound is 7.
Next, we shall also consider the chain if there is any double or triple bond.
From the diagram given above, no double or triple bond is present.
Finally, the parent name of the compound is heptane since the longest continuous carbon chain is 7 and no double or triple bond is present in the compound.
From which type of clouds do hail pellets form?
Answer:
Hail pallets forms inside of cumulonimbus clouds
Explanation:
Answer: cumulonimbus hope it helps pls stay safe