Answer:
C. Experiments test the scientists' ideas.
Explanation:
Experiments test the scientists' ideas. Therefore, the correct option is C.
By testing ideas and hypotheses, experiments are an essential part of the scientific method and aid scientists' understanding of the world. Science uses regulated procedures to detect particular phenomena, track results, and collect data. These studies give researchers a chance to investigate cause-and-effect relationships, detect patterns, and draw conclusions based on the data. Scientists can test their ideas, theories, and predictions by systematically adjusting various factors to see whether experimental results confirm or disprove them.
Therefore, the correct option is C.
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6 What is cell wall? where is it found? insy.
Answer:
what is cell wall?
A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea
where is it found
They are found in bacteria, archaea, fungi, plants, and algae.
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Answer:
The cell wall is the protective, semi-permeable outer layer of a plant cell. A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection.
Plzzz help do your best to answer these questions
The empirical formula is the simplest formula of a chemical compound.
To find the empirical formula, we take the following steps;
Divide the percentage by mass of each element by its relative atomic mass.Divide the quotient of each by the lowest value obtained instep 1 aboveWrite the result of step 2 above as the subscript following each atom.1) O - 88.10/16, H - 11.190/1
O - 5.5, H - 11.19
O - 5.5/5.5, H - 11.19/5.5
O - 1, H - 2
Empirical formula = OH2
2) C - 41.368/12 H - 8.101/1, N - 32.162/14, O - 18.369/16
C - 3, H - 8, N - 2, O - 1
C - 3/1, H - 8/1 N - 2/1 O - 1/1
C - 3, H - 8, N - 2, O - 1
Empirical formula = C3H8N2O
To obtain the molecular formula where n = number of atoms of each element;
Molecular weight = 174.204 g/mol
[ 3(12) + 8(1) + 2(14) + 16]n = 174
n= 174/88
n = 2 (to the nearest whole number)
Hence, we have;
[C3H8N2O]2
The molecular formula is C6H16N4O2
3) C - 19.999/12, H - 6.713/1, N - 46.646/14, O - 26.641/16
C - 2, H - 7, N - 3, O - 2
C - 2/2, H - 7/2, N - 3/2, O - 2/2
C - 1, H - 4, N - 2, O - 1
Empirical formula - CH4N2O
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Explain why the reaction between lead oxide and carbon is called a redox reaction.....
Answer:
Explanation:
It's called a Redbox reaction because when a change in oxidation number occurs in a reaction, with both an increase in number and a decrease in number, then the reaction is classified as redox. If this doesn't occur, then the reaction is non- redox.
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A new stable element with an atomic number of 120 and an atomic mass of 246 is created in a particle accelerator. Enough of this element is created to determine that it combines with chlorine in a 1:2 ratio. Element 120 should be placed in the same group as _____ on the periodic table.
Answer:
Be,Mg,Ra etc
Explanation:
It should be palced in group 2A because as it reacts with chlorine in ratio of 1:2 . It's valancy is 2 and is metal as it react with non metal donating two electrons .
one more thing it fits there orderly
why does increasing the pressure of a gas increase the reaction rate?
A. it increases the temperature of the gas.
B. it increases the reaction-rate constant.
C. it increases the activation energy.
D. if increases the number of collisions
Answer:
d it increase the number of collisions
Explanation:
cos collision is a type reaction to other particles
Hope that helps you
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Option A may be I think!!!!!
what are the useful of carbon monoxide?
Answer:
carbon monoxide is strong reducing agent.carbon monoxide used in the extraction of pure metals of their ores.
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16. The valency of sodium is +1 and that of chlorine is -1, why?
Answer:
It because ,sodium is a metal and chlorine is a non metal
write the molecular formula of nitrate using criss cross method
Answer:
NO3 that is the answer to the question
HELP URGENT PLS!1!! In what direction and how many spaces must you move the decimal point to make the following conversion?
600 L to mL
left; 6 spaces
left; 6 spaces
left; 3 spaces
left; 3 spaces
right; 6 spaces
right; 6 spaces
right; 3 spaces
To convert from L to ml, we move three spaces to the right and the decimal place moves three places.
Our task here is to convert 600 L to mL. we have to remember that to convert from L to ml, we have to multiply the value in L by 1000
In other words, the value 1000 is known as the conversion factor.
When we do this, we move the decimal place three places to the right to have 600000.00mL
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what oxide other than NO2 produce two acids when added to water?
Answer:
NO3 will produce 2 acids
Which of the following type of matter has weakest interparticle force of attraction O a. Liquid water
O b. Iron
O c. Steam
O d. sand
Answer:(b)liquid water is correct option . Because it is a molecular solid and molecular solid has weak interparticle forces of attraction
Explanation:
Read ""the Ozone Hole"" and answer the question below list at least three scientific disciplines related to chemistry mentioned or alluded to in the article
Answer:
Any 3 of the following:
atmospheric science
environmental science
climate science
biology
astronomy
human physiology and medicine
Explanation:
Got it right on edge 23
Grease is applied to the moving part of machine.
Answer:
Explanation:
The moving part won't move on its own there's a force but the force isn't enough for something like a bike chain it need grease to move smoothly or else it will just be super stuck or slow.
Answer:
because grease produce more fiction which helps moving part of machine not get jamm while working
Explain the bonding that occurs between sodium and chlorine. Specifically, what kind of bonding takes
place, what’s the name of the resulting compound, and what properties would you expect this compound to
have with respect to water?
Answer:
About bonding
Explanation:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bond.
Answer:
An ionic bond occurs between sodium and chlorine where sodium has one electron while chlorine has seven electrons. The electron from sodium is lost and transferred to a chlorine atom which results in a sodium ion with a charge of one+ and a chloride ion with a charge of one-. These oppositely charged ions attract each other making a balanced charge to make a compound that is electrically neutral.. Sodium cation (Na+) and chlorine anion (Cl-) are attracted to each another to form sodium chloride (table salt). When dissolved in water, the sodium and chloride ions are strongly attracted to the polar water molecules because of ion-dipole interactions.
Explanation:
who was the first person to go to the moon
Answer:
The first person to go to the moon
Explanation:
Neil Armstrong was the first person !
heres more info on NASAs page!
https://www.nasa.gov/audience/forstudents/k-4/stories/first-person-on-moon.html
Predict with a reason, what would happen to a packet of potato chips that is packed with air when it is taken to o high mountain.
Explanation:
If you bring an unopened bag of potato chips aboard an airplane you'll notice that the bag puffs up as the plane ascends to a higher altitude explain why this happens using the information and terminology you learned in this module
Question 2 of 10
How might the government make sure scientific research is done in an ethical
way?
A. By encouraging scientists to perform within their own ideas of
right and wrong
B. By letting public opinion determine what is ethical in scientific
research
C. By allowing scientists to do what they think is best
D. By taking away research funds if certain ethical standards are not
met
Answer: D
Explanation:
what is the product of SO2+H2O.
Answer:
H2O + SO2 → H2SO3
Explanation:
H2O + SO2 → H2SO3
Answer:
l think this is the answer .
The gases in a hair spray can are at a temperature of 27oC and a pressure of 30 lbs/in2. If the
gases in the can reach a pressure of 90 lbs/in2, the can will explode. To what temperature must
the gases be raised in order for the can to explode? Assume constant volume. Show your work.
Using Gay Lussac's Law
[tex]\boxed{\sf \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}}[/tex]
[tex]\\ \sf\longmapsto \dfrac{30}{27}=\dfrac{90}{T_1}[/tex]
[tex]\\ \sf\longmapsto T_1=\dfrac{90\times 27}{30}[/tex]
[tex]\\ \sf\longmapsto T_1=81°C[/tex]
Key Notes:-Gay Lussac's Law:-
It states that at constant volume (V),The pressure(P) of fixed amount of gas caries directly with its absolute temperature(T).
[tex]\\ \sf\longmapsto P\propto T[/tex]
[tex]\\ \sf\longmapsto \dfrac{P}{T}=Constant[/tex]
[tex]\\ \sf\longmapsto \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
[tex]\\ \sf\longmapsto P_1T_2=P_2T_1[/tex]
The final temperature of the gases with 90 lbs/in² is equal to 627°C assuming the volume is constant.
What is Gay Lussac's law?Gay-Lussac's law can be described as if the volume (V) of the gas remains constant then the pressure (P) is directly proportional to the absolute temperature (T) of the gas.
Gay Lussca's law in mathematical expression can be represented as:
P/T = k
It can be also represented as the pressure (P) being directly proportional to the temperature (T).
P ∝ T ( V of gas is constant)
or, P₁/T₁ = P₂/T₂
Given, the initial temperature of the gas, T₁ = 27°C = 27 + 273 = 300 K
The initial pressure of the gas, P₁ = 30 lbs/in²
The final pressure of the gas, P₂ = 90 lbs/in²
The final temperature of the gases in a hair spray can be determined as:
[tex]{\displaystyle \frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
[tex]{\displaystyle T_2 =\frac{P_2\times T_1}{P_1}[/tex]
[tex]{\displaystyle T_2 =\frac{90\times 300}{30}[/tex]
T₂ = 900 K = 900 - 273
T₂ = 627°C
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What is known about a reaction with a positive enthalpy?
Answer:
"Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings of the reaction."
Explanation:
When enthalpy is positive and delta H is greater than zero, this means that a system absorbed heat. This is called an endothermic reaction. When enthalpy is negative and delta H is less than zero, this means that a system released heat. This is called an exothermic reaction.
What does a high positive enthalpy mean?
The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.
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Luisa is flying from Dallas to New York to visit her cousin. Her carry-on bag weighs 39.4 lbs. However, there is a weight restriction of 18 kg per bag. Will she be permitted to bring her bag on the plane?
Which of the following is the formula for vanadium (II) oxide? Question 11 options: A) VO2 B) VO C) V2O3 D) V2O5
Answer: A. ( VO2)
Explanation:
Answer:
B) VO
Vanadium(II) oxide is the inorganic compound with the idealized formula VO.
step by step of how to convert fahrenheit and celsius to kelvins -5F to kelvins please and thank you
An atom has mass number 23 and atomic number 11.
a) How many electrons are revolving around the nucleus?
b) How many electron shells are there in the atom?
A): The closest orbital to the nucleus, called the 1s orbital, can hold up to two electrons. This orbital is equivalent to the innermost electron shell of the Bohr model of the atom. It is called the 1s orbital because it is spherical around the nucleus. The 1s orbital is always filled before any other orbital.
the volume of a gas is 568.4 ml at 23.2 if the temperature is increased to 93.4 without changing the pressure what is the new volume of the gas ?
Answer:
Do not incinerate "why the gas in the gas is initially at 23degree and 360kPa and the can has a volume of 350Ml
D
BF3 is the Lewis____in the
following reaction.
BF3(g) + F-(aq) → BF4 - (aq)
A. acid
B. base
Answer:
A
Explanation:
Its an acid.
Please help
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Answer:
this is my answer.........
potassium permanganate + water = ? which product will they form,and in which phase is it?
KMnO4 + H2O = MnO2 + O2 + KOH
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Using these metal ion/metal standard reduction potentials calculate cell potential for Cu2+(aq) + Cd(s) →Cd2+(aq)+ Cu(s) Cu2+(aq)|Cu(s) + 0.34 VNi2+(aq)|Ni(s) -0.25 Cd2+(aq)/Cd(s) -0.4V
Solution :
Cd(s) ----------------------> [tex]Cd^{+2}[/tex] (aq) + 2[tex]e^-[/tex] , [tex]E_0[/tex] = 0.34 v
[tex]Cu^{+2}[/tex] (aq) + 2[tex]e^-[/tex] ------------> Cu (s) , [tex]E_0[/tex] = -0.04 v
----------------------------------------------------------------------------------------------
Cd(s) + [tex]Cu^{+2}[/tex] (aq) -------------> [tex]Cd^{+2}[/tex] (aq) + Cu (s) , [tex]E_0[/tex] = 0.30 v
The cell potential is defined as the measure of [tex]\text{ potential difference }[/tex] between the [tex]\text{two half cells}[/tex] of an electrochemical cell.
Which kind of bond would occur between sodium (Na, Group IA) and chlorine (Cl, Group VIIA)?
Answer:
ionic
Explanation:
I'll put the rest if the answers in comments
Answer:
1. Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?
*The bonds can shift because valence electrons are held loosely and move freely.*
2. Between which types of elements do ionic bonds occur, and how do electrons act within the bond?
*metals and nonmetals, electrons transferred*
3. Which kind of bond would occur between sodium (Na, Group IA) and chlorine (Cl, Group VIIA)?
*ionic*
4. Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group VIA?
*four covalent bonds*
5. How many covalent bonds is nitrogen (Group 5A) likely to form?
*three*
These are all the answers to the Bonds Quick Check.
