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
Give reasons for : The empirical and molecular formulas of methane gas (CH4) are
identical.
Answer:
Because in methane atoms of carbon and hydrogen are present in simplest ratio of 1:4 that can not be simplified further in whole number so its Emperical formula is same as molecular formula.
Explanation:
8) A 13.5 liter balloon is heated from 248 K to 324 K. What will its new
volume be?
Answer:
It's new volume will be approximately 17.637 liters.
Explanation:
Convert 1.60 x 107 cm to mm in scientific notation
please help
Answer:
4.8x10^9
Explanation:
02. Two great pe birds are morati Both birth have a ne
grams and are flying at 90 kilometers per hou BRASIL
ove the ground, and Bird is lying 25 km above the on
Bird
Answer:
I don't understand the question.
Explanation:
Please help with this question
Answer:
D
Explanation:
2 substances react making them 1
what does fire need to burn
Answer:
Fuel and Oxygen
Explanation:
effects of mg2 on enhancing luminescence efficiency for a red long persistent phosphor γ-zn3 (po4) 2: mn2
Through homogeneous co-precipitation and traditional solid-state calcining, a red long persistent phosphor of -Zn3(PO4)2: Mn2+, Mg2+ was created.
Effects of mg2 on improving luminous performance for a red long-lasting phosphor, -zn3 (po4) 2: mn2X-ray diffractions, scanning electron microscopes, X-ray photoelectron spectroscopies, decay curves, and thermoluminescence spectra were used to corroborate the crystalline structures and characteristics of the materials. The phase transition of Zn3(PO4)2:Mn2+ from to as well as the enhancement of the crystallinity of phosphors will be caused by the dopant of Mg2+, according to the XRD results. A noticeable peak at 620 nm in the photoluminescence emission spectrum of the red -Zn3(PO4)2: Mn2+, Mg2+ phosphor is due to the Mn2+ ion's 4T1g-6A1g transition. The addition of Mg2+ as a dopant can significantly improve the luminous characteristics of -Zn3(PO4)2: Mn2+. For the discussion of intrinsic flaws, TL curves are used. The suggested persistent luminescence operating mechanismlearn more about phosphor here
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Marcel conducts an experiment to test which stain remover works best on mustard stains. He wants to make sure that he does not make mistakes and has correct data in his experiment. What should Marcel do to make sure that his data are correct? conduct a similar experiment with a different washing machine ask other students to conduct related experiments at their homes ask his sibling to conduct the same experiment using his washing machine repeat the experiment several times with the same variable and constants
Answer: Repeat the experiment several times with the same variable and constants.
Explanation: The experimental procedure should be performed many times so as to determine the effect of the stain remover on mustard stain in different conditions and while using different variables such as water and type of machine used. This will tell how useful the stain remover in all conditions provided to check the accuracy of the stain remover.
Hope this help!!! :)
Answer:
C
Explanation:
if his brother does the expire end it is replication if he was to do the same expirement with the same variables then the same outcome would come out
What type of solution is formed when solid sodium hydroxide (NaOH) is dissolved in water?
A) an electrolytic solution, because NaOH will dissociate into ions
B. an electrolytic solution, because NaOH will not dissociate into ions
C) a nonelectrolytic solution, because NaOH will not dissociate into ions
D) a nonelectrolytic solution, because NaOH will dissociate into ions
The statement " an electrolytic solution, because NaOH will dissociate into ions" is correct.
What is electrolytic solution?A solution that contains ions, atoms, or molecules that already have gained or lost electrons and also is electrically conductive is known as an electrolyte solution. They're known as ionic solutions because of this.
NaOH can be considered as electrolyte because sodium hydroxide was soluble in water, it will entirely dissociate into its ions. As a result, it can classify NaOH as a strong electrolyte. When electrolytes are dissolved in water, they form a solution that conducts electricity.
The reaction can be written as:
NaOH (s) + [tex]H_{2}O[/tex] → [tex]Na^{+} +OH^{-} +H_{2}O[/tex]
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Which of the following statements best explains the type of chemical reaction represented by Jane's picture?
Answer:
There are no statements. Edit your question and state the statements.
Answer:
There should be a image
When 7.68 g of zinc react with hydrochloric acid, what volume of hydrogen gas will be collected at 20.00C and 740 mm Hg?
Answer:
V ≈ 2.9 L H₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisChemistry - Reactions
Aqueous Solutions and states of matterReaction PredictionChemistry - Gas Laws
Combined Gas Law: PV = nRT
P is pressureV is volume in litersn is amount of moles of substanceR is a constant - 62.4 (L · mmHg)/(mol · K)T is temperature in KelvinsTemperature Conversion: K = °C + 273.15
Explanation:
Step 1: Define
Unbalanced RxN: Zn (s) + HCl (aq) → ZnCl₂ (aq) + H₂ (g)
Balanced RxN: Zn (s) + 2HCl (aq) → ZnCl₂ (aq) + H₂ (g)
Given: 7.68 g Zn, 20.00 °C, 740 mmHg
Step 2: Identify Conversions
Kelvin Conversion
Molar Mass of Zn - 65.39 g/mol
Step 3: Convert
Stoichiometry: [tex]7.68 \ g \ Zn(\frac{1 \ mol \ Zn}{65.39 \ g \ Zn} )(\frac{1 \ mol \ H_2}{1 \ mol \ Zn} )[/tex] = 0.117449 mol H₂
Temp Conversion: 20.00 + 273.15 = 293.15 K
Step 4: Find V
Substitute: (740 mmHg)V = (0.117449 mol)(62.4 (L · mmHg)/(mol · K))(293.15 K)Multiply: (740 mmHg)V = 2148.45 L · mmHgIsolate V: V = 2.9033 L H₂Step 5: Check
We are given 2 sig figs as our lowest. Follow sig fig rules and round.
2.9033 L H₂ ≈ 2.9 L H₂
Which of these is an example of a description of
speed?
An airplane traveled west from New York to Los
Angeles.
A train traveled east at 200 mph from Albuquerque to
Dallas.
The average Olympic sprinter runs 8 m/s.
An apple fell from the tree and then rolled 1 m north.
Answer:
The average Olympic sprinter runs 8 m/s.
Explanation:
Speed is defined as the change of an object from one position to another position with respect to the time taken. It is independent of direction and only depends on the change of its position.
In the context, all the other sentences has direction mentioned in the sentence except the sentence "the average Olympic sprinter runs 8 m/s". In this sentence, the speed of an Olympic sprinter id given i.e. 8 meter per second.
Write the names of the following covalent compounds: SiO2
Answer:
Silicon dioxide
Explanation:
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO₂, most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand.
The name of the following covalent compound: SiO₂ is silicon oxide.
What is the name of the covalent compound?The name of the covalent compound is silicon oxide. Note that covalent compounds are known for their ability to share electrons. This is the case with the compound, silicon oxide that shares electrons with oxygen.
In the compound, there are two atoms of oxygen and one atom of silicon.. So, the name of the compound is silicon oxide.
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Titanium(IV) selenide formula
Answer:
TiSe2
iExplanation:
the iV gives you the charge of the cation (titanium) abd you want enough se to balance out the charge to 0
ionic compounds are electrically neutral overall. therefore, the sum of the charges on the cation and anion in each formula unit must be equal to .
ionic compounds are electrically neutral overall. therefore, the sum of the charges on the cation and anion in each formula unit must be equal to zero
What is ionic compound ?Ions are charged particles that form when an atom (or group of atoms) receives or loses an electron, and ionic compounds are composed of these charged particles. An anion is a negatively charged ion, whereas a cation is a positively charged ion.
The simplest way to determine whether a chemical compound is an ionic compound is to see if it only contains two elements, one of which can be a metal (belonging to either of groups 1, 2, or 3), and the other of which can be a non-metal (from group 5, 6 or 7).Learn more about Ionic Compound here:
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Which chemicals are reactants?
0: NH₃ + 0 02
0:02 0: N2 + 0:420
A. NH3 and O2
B. O, and H2O
C. N, and H2O
D. NH3 and N2
I NEED IT TODAY!!!!! (20 Points)
Base your answer on the information below and your knowledge of chemistry.
Methanol can be manufactured by a reaction that is reversible. In the reaction, carbon monoxide gas and hydrogen gas react using a catalyst. The equation below represents this system at equilibrium.
CO(g) + 2H2(g) CH3OH(g) + energy
State the class of organic compounds to which the product of the forward reaction belongs.
Answer:
I think it belongs to a gas type or a liquid type. not sure
I am sorry if you get it wrong
Name two metalloids that are semiconductors.
Answer:
Carbon silicon
Explanation:
They are very common
How many electrons are gained in the half-reaction O2 + electrons — 202?
O
A. 2
O
B. 4
o
C. O
o
D. 1
SUBMIT
Answer: B. 4
Explanation:I just took it
Light radiation travels as a wave and does ________ require a _____________ for travel
Answer:
not
medium
Explanation:
Light radiation travels as a wave and does not require a medium for travel. Like all electromagnetic radiations, light does not need medium particles for its propagation.
Light radiation can pass through a vacuum of space without particles. This carries energy from one point to another in this region of space. Such form of waves are electromagnetic waves. Electromagnetic waves can be propagated through vacuums.Why is it important for us to study isotopes?
Answer:
it is useful in diagnostics and treatment applications
What are the similarities and differences between ionic compounds and metals? Why are they important? Describe some common ionic compounds and metals and their uses in everyday life.
Answer:
Similarities:
1. Electrostatic attraction between particles of unlike charges. occurs in both ionic compounds and metals
2. Both involve metallic cations. Metallic cations are present in both ionic compounds and in metals.
3. Both ionic compounds and metals have a crystal lattice structure in their solid state.
4. Both ionic compounds and metals have high melting and boiling points
5. Both can conduct electricity although ionic compound do so only in molten or solution form.
Differences:
1. The crystal lattice of an ionic compound consists of two oppositely charged ions of two or more elements whereas metals lattices consists of metal cations and delocalised electrons of the same metal.
2. Ionic compounds are compounds whereas metals are elements.
3. Ionic compounds are brittle whereas metals are malleable and ductile.
4. Electrons are transferred from one atom to another in ionic compounds whereas in metals, are delocalised around metallic cations
5. Metals are sonorous and are shiny whereas ionic compounds are not.
Importance of ionic compounds and metals
Ionic compounds are important as salts in industries, as food additives, in detergent and soap-making, as electrolytes and in biochemical systems.
Metals are important in building and construction industry, in jewellery, as conductors in wires and electrode plates, in making parts for vehicles used in transportation
Common ionic compounds and their uses:
Sodium chloride, Potassium iodide and Sodium fluoride are used as a food additive and preservative, as electrolytes, as well as in toothpastes for healthy teeth.
Common metals and their uses
Iron, Aluminum and Gold are used in steel production, making many cooking utensils and for making jewelleries
Explanation:
Similarities:
1. Electrostatic attraction between particles of unlike charges. occurs in both ionic compounds and metals
2. Both involve metallic cations. Metallic cations are present in both ionic compounds and in metals.
3. Both ionic compounds and metals have a crystal lattice structure in their solid state.
4. Both ionic compounds and metals have high melting and boiling points
5. Both can conduct electricity although ionic compound do so only in molten or solution form.
Differences:
1. The crystal lattice of an ionic compound consists of two oppositely charged ions of two or more elements whereas metals lattices consists of metal cations and delocalised electrons of the same metal.
2. Ionic compounds are compounds whereas metals are elements.
3. Ionic compounds are brittle whereas metals are malleable and ductile.
4. Electrons are transferred from one atom to another in ionic compounds whereas in metals, are delocalised around metallic cations
5. Metals are sonorous and are shiny whereas ionic compounds are not.
Importance of ionic compounds and metals
Ionic compounds are important as salts in industries, as food additives, in detergent and soap-making, as electrolytes and in biochemical systems.
Metals are important in building and construction industry, in jewellery, as conductors in wires and electrode plates, in making parts for vehicles used in transportation
Common ionic compounds and their uses:
Sodium chloride: sodium chloride is an ionic compound composed of sodium and chloride ions. It is commonly used as a food additive and preservative, as an electrolyte, as well as the extraction of sodium metal.
Potassium iodide: it is composed of potassium and iodine ions. It is added to “iodized” salt to prevent goitre.
Sodium fluoride: it consists of sodium and fluoride ions. It is an important ingredient in toothpaste for healthy teeth.
Common metals and their uses
Iron; iron is used in steel production which is used for constructing bridges, houses, and various machinery parts
Aluminum: it is used in making many cooking utensils like pots and pans
Gold: it is used in making jewelleries and ornaments.
Iconic bonds only form with metals and non metals. They have to give up electrons and non metals want to gain electrons.
They are important as the variance electrons are transfer from the meal to the neighboring nonmetal. But the electron bonding they are free to float around within the entire solid metal. Sodium carbonate, potassium chloride an magnesium sulphate etc. are some of the common iconic compounds.Learn more about the and differences between ionic compounds.
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In an atom how many protons and electrons
Answer:
Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons.
Explanation:
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Which experiences a greater effective nuclear charge in a Be atom, the 1s electrons or the 2s electrons? Explai
The 1s electrons experience a greater effective nuclear charge in a Be atom as compared to 2s electrons due to less distance from the nucleus.
Which type of electrons experience great nuclear charge?Those electrons that are present near to the nucleus of an atom experience great nuclear charge while on the other hand, those electrons that are present far from the nucleus of an atom experience smaller nuclear effect of the nucleus. This is because the force of attraction of protons that is present in the nucleus on the electrons that is present around the nucleus in various orbits. We know that 1s electrons are present near to the protons whereas 2s electrons are present far from the nucleus.
So we can conclude that the 1s electrons experience a greater effective nuclear charge in a Be atom as compared to 2s electrons due to less distance from the nucleus.
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If an object has 25 newtons of force pushing from the left and 26 newtons of force pushing from the right the object will
A.stay in place
B.move right
C. move left
D. Fall over
Answer:
C. move left
Explanation:
The object will move towards the left direction due to the unbalanced forces that are acting on it.
The resultant force on the object will be 1N in the left direction
The resultant force on a body is that singular force that will have the same effect as the different forces that acts on a bodyWhen forces acts in opposite directions, they are subtractedThe object will move in the direction of the one with the greater forceSo;
Resultant force = 26N - 25N = 1N
The body moves 1N to the left
what element is a F-18 Atom
Answer:
Sodium Fluoride F 18 Injection is a positron emitting radiopharmaceutical, no-carrier added.
Explanation:
Element Name Fluorine
Element Symbol F
Atomic Number 9
2KCI -> K + CI2
balanced or unbalanced pls help
Answer:
unbalanced I know you should know to
what is a coefficient
Answer:
In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables.
Explanation:
At 3 atm of pressure, a cylinder with a movable piston contains 2000 ml of gas. If the pressure
is increased to 8 atm and the temperature remains unchanged, what is the new volume of the
gas?
Answer:
V₂ = 750 mL
Explanation:
Given data:
Initial pressure = 3 atm
Initial volume = 2000 mL
Final pressure = 8 atm
Final volume = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
3 atm × 2000 mL = 8 atm × V₂
V₂ =6000 atm. mL / 8atm
V₂ = 750 mL
Hi can someone please help me!
Answer:
a) 2
b) 2
c) 5
d) 5
e) 5
Explanation:
a) There is 1 Ag atom and 1 Cl atom. When there's no subscript number next to an element, it means there is only one.
b) There is 1 Ca atom and 1 O atom.
c) There are 3 Mg atoms (there's a subscript 3 next to Mg) and 2 N atoms.
d) There are 2 Al atoms and 3 O atoms.
e) There are 2 Sc atoms and 3 S atoms.