Answer:
Tara does not get the same results when she conducts the experiment
Explanation:
The most likely reason Tara suggested to Victor to perform the experiment again before publication would be because she did not get the same results when she conducted the experiment.
A good scientific research or experiment should have an element of reproducibility. In order words, the claim made in published scientific research should be reproducible by any other scientist that decides to replicate the research. Tara repeated Victor's experiment in order to check its reproducibility and when she could not reproduce the results, she had to tell Victor to conduct the experiment again before deciding to publish it.
Radiation is when heat is transferred through
A.
the
air
B. the object
O
C. the sun
D. the liquid
Answer:
I think its C
Explanation:
because it travels from the sun to earth
What is the molecular formula of the compound with a molecular weight of 112 g/mol and percent composition: 85.6% C and 14.4% H?
Select one:
a.C2H4
b.CH2
c.C4H8
d.C8H16
Explanation:
Mass of C = 112g * (85.6/100) = 95.87g
Moles of C = 95.87g / (12g/mol) = 8
Mass of H = 112g * (14.4/100) = 16.13g
Moles of C = 16.13g / (1g/mol) = 16
Hence the compound is C8H16. (D)
1) Why are most fossils found in sedimentary rocks? *
10 points
A. Sedimentary rocks are not very old.
B. Organisms live only in areas with sedimentary rock
C. Organisms can be preserved in sedimentary rock
D. Sedimentary rocks are found only if the surface of the ground.
Answer:
i think it might be c
Explanation:
i'm not positive though
Answer:
C
Explanation:
Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.
For the reaction 2H 2 +O 2 2H 2 O calculate the percent yield if 860. of water is produced when 100. g of hydrogen react with an excess of oxygen?
The percent yield : 95%
Further explanationGiven
Reaction
2H₂+O₂ ⇒2H₂O
Required
The percent yield
Solution
mol of Hydrogen(as a limiting reactant) :
[tex]\tt \dfrac{100}{2}=50[/tex]
mol H₂O based on H₂ , and from equation mol ratio H₂:H₂O=2 : 2, so mol H₂O = 50
Mass of water(theoretical yield) :
[tex]\tt mass=50\times 18=900~g[/tex]
[tex]\tt \%yield=\dfrac{860}{900}\times 100\%=95\%[/tex]
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
How many moles of HNO3 must react to form 14.5 moles of H2O?
Answer:
43.5 moles of HNO₃.
Explanation:
The balanced equation for the reaction is given below:
S + 6HNO₃ —> H₂SO₄ + 6NO₂ + 2H₂O
From the balanced equation above,
6 moles of HNO₃ reacted to produce 2 moles of H₂O.
Finally, we shall determine the number of mole of HNO₃ required to produce 14.5 moles of H₂O.
This can be obtained as illustrated below:
From the balanced equation above,
6 moles of HNO₃ reacted to produce 2 moles of H₂O.
Therefore, Xmol of HNO₃ will react to produce 14.5 moles of H₂O i.e
Xmol of HNO₃ = (6 × 14.5)/2
Xmol of HNO₃ = 43.5 moles
Therefore, 43.5 moles of HNO₃ is required to produce 14.5 moles of H₂O.
I need help with my homework i don't understand nothing
Answer:
ok so im gonna go and do some for your latest questions then if thats alright with you
Explanation:
i need points so im trying to help as many people as i can before the end of the day.
but you have to make the questions forst so i can help you understand them
types of hardness water
Answer:
A water repellent protein that divides into hard and soft types
what is the mass of 3.20x10^23 formula units of iron (III) oxide (Fe2O3)?
The mass of iron (III) oxide (Fe2O3) : 85.12 g
Further explanationGiven
3.20x10²³ formula units
Required
The mass
Solution
1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol of Fe₂O₃ :
[tex]\tt n=\dfrac{3.2.10^{23}}{6.02.10^{23}}=0.532[/tex]
mass of Fe₂O₃ (MW=160 g/mol)
[tex]\tt mass=mol\times MW=0.532\times 160=85.12~g[/tex]
We have 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] in 3.20*10^23 particles.
Data;
number of particles = 3.20*10^23molar mass = 159.69g/molAvogadro's number = 6.023*10^23 particles.To solve this problem, we need to relate Avogadro number to the molar mass.
From molar mass - Avogadro's number relationship;
[tex]159.69g = 6.023*10^2^3\\xg = 3.20*10^2^3\\x = \frac{159.69*3.20*10^2^3}{6.023*10^2^3} \\x = 84.84g[/tex]
From the above calculations, 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] is present in 3.20*10^23 particles of Fe[tex]_2[/tex]O[tex]_3[/tex].
Learn more on Avogadro's number here;
https://brainly.com/question/20091306
Read the scenario, then answer the questions. A 2 kg ball is thrown upward with a velocity of 15 m/s. What is the kinetic energy of the ball as it is being thrown? J
Answer:
225 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 2 \times {15}^{2} \\ = 1 \times 225 \\ = 225 \: \: \: \: \: \: \: \: [/tex]
We have the final answer as
225 JHope this helps you
Answer:
225 J for both answers
Explanation: :)
Plastic is used to cover the copper wire in the power codes of appliances because plastic differs from copper in _________
Answer:
in copper from different plastics because appliances of codes to power day in wire copper the cover to use to plastic
What is true about elements that are in the same column group or family
The given question is incomplete. The complete question is:
Which is true of Elements on a periodic table in the same group (family)?
A; Elements in the same family have similar chemical properties because they have the same number of electron shells.
B; Elements in the same family have similar chemical properties because they have the same number of valence electrons.
C; Elements in the same family have few similar properties as they have different numbers of electron shells.
D; Elements in the same family are always the same type of Elements and have the same number of protons.
Answer: B; Elements in the same family have similar chemical properties because they have the same number of valence electrons.
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons. The chemical reactivity of elements is governed by the valence electrons present in the element.
Example: Flourine, chlorine and bromine are elements which belong to Group 17. They have 9, 17 and 35 electrons respectively and contain 7 valence electrons each and need one electron to complete their octet.
Draw a Lewis structure showing how two oxygen atoms share two pairs of electrons.
Answer:
See explanation
Explanation:
A Lewis or dot structure shows the electrons on the valence shells of the bonding atoms as dots.
The method was developed by Sir G.N Lewis.
Oxygen is a diatomic molecule as shown in the image attached to this answer. There are two unshared electrons on each oxygen atom as well as four shared electrons
The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.
Oxygen has been a group 6A element consisting of 6 valence electrons. In order to attain the stable configuration, the atom of oxygen has been required to gain two electrons.
The oxygen shares its electrons with another oxygen atom and forms a covalent bond. The resulted bond has been able to stabilize the structure.
The image attached shows the lewis dot structure of the oxygen atom. The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.
For more information about the lewis dot structure, refer to the link:
https://brainly.com/question/4144781
How can you turn mechanical energy into electrical energy
Answer:
In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.
Explanation:
Hope this helps!
Brain-List?
How do you find the precipitate in chemistry?
Answer: An ionic solution is when the ions of a compound have dissociated in an aqueous solution. A reaction happens when you mix two aqueous solutions. This is when you find out if a precipitate will form or not. A precipitate forms if the product of the reaction of the ions is insoluble in water.
Explanation: I think ;>;
A compound with the empirical formula CH2 was found to have a molar mass of approximately 84g. What is the molecular formula of the compound?
Answer:
C6H12
Explanation:
Molar mass of C =12.0 H=1.0
12x + 2(1x) = 84
x = 6
so it should be C6H12
The molecular formula of the compound will be C₇H₁₄.
What is the empirical formula?The empirical formula of the compound gives the simplest ratio of the number of different elements present in a compound. The molecular formula of the compound provides the actual number of each element present in a compound. This formula is generally used and can be determined as a multiple of the empirical formula of a compound.
The empirical formula offers the ratio of the number of each atom in a given compound. The composition of a compound is directly determined by its empirical formula.
Given, the empirical formula of the compound is CH₂.
The empirical formula mass of the compound = 12 + 2 = 14 g
The molar mass of the compound = 84 g
The multiple will be = 84/12 = 7
The molecular formula of the compound = (CH₂)₇ = C₇H₁₄
Therefore, the molecular formula of the compound is C₇H₁₄.
Learn more about the empirical formula, here:
brainly.com/question/14044066
#SPJ2
SHOW WORK
A person weighs 150 lbs, what is that weight in kg?
What is the name of: CH3-CH(CH3)-CH2- alky group?
isopropyl
propyl
sec-butyl
butyl
Answer:
propyl
Explanation:
CH3-CH(CH3)-CH2 is a propyl group, the halogen is bromine thus the common name is propyl bromide
please help. thank you!
Find an interesting chemical reaction. It can be a simple one but please have some facts and info about it. Thank you!
Answer:
Elephant Toothpaste
When hydrogen peroxide and potassium iodide are mixed in proper proportions, the hydrogen peroxide decomposes very quickly.The soapy water traps the oxygen, a product of the reaction, and creates many bubbles. Foam is a kind of a mixture called a colloid - gas bubbles in a liquid.It produces foam but it also can produce heat.Extra
Make Elephant Toothpaste
Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you won't mind getting wet foam everywhere.
In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about five minutes to activate before proceeding to the next step.
When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast.
I don't know if this will help but here you go.
if you cant see the image please let me know. last time i put an image someone said its blurry.
Answer:
no , it's clear like a mirror
there's is nothing blurred
Which of the four elements is most likely to form cations in its reactions?
OA Nh
OB Ts
Oc Mc
OD. Og
Answer: It’s Nh !!!
Explanation:
Alkali metals and alkaline earth metals always produce cations, while halogens always produce anions. so, option A is correct.
What is cation ?A cation has a net positive charge because it contains more protons than electrons. One or more electrons must be lost in order for a cation to develop normally, these electrons are drawn away by atoms having a larger attraction for them.
Main-group elements often produce cations with a charge equal to the group number as they move from the extreme left to the right on the periodic table. To put it another way, group 1 elements produce 1+ ions, group 2 elements produce 2+ ions, and so on.
Cations, which have a positive charge, are created when electrons are lost. Anions, which have a negative charge, are created when electrons gain energy.
Thus, option A is correct.
To learn more about cation refer the link below;
https://brainly.com/question/1333307
#SPJ2
identify the names of the reactants and products in the reaction.
CaCO3 -> CaO + CO2
Answer:
Name of the reactant --- Calcium CarbonateName of the product --- Calcium oxide and Carbon dioxideThe names of the reactant and products are:
1. The name of the reactant is calcium trioxocarbonate (iv) (CaCO₃)
2. The names of the products are:
a. Calcium oxide (CaO)
b. Carbon (iv) oxide (CO₂)
In a chemical equation, the reactants are located on the left hand side (LHS) while the products are located on the right hand side (RHS)
With the above information, we can determine which is the reactant and which is the product in the question given above. This can be obtained as follow:
CaCO₃ —> CaO + CO₂
Reactant => CaCO₃Products => CaO and CO₂The name of CaCO₃ is calcium trioxocarbonate (iv).
The name of CaO is calcium oxide.
The name of CO₂ is carbon (iv) oxide
Learn more: https://brainly.com/question/11764613
Help me asap it’s for my chem
You have 1.2 moles of NH 4 NO 3 in a 6 M solution. How many liters is that?
A) 0.5 L
B) 0.72 M
C) 0.72 L
D) 2 L
Answer:
Volume = 0.2 L
Explanation:
Given data:
Number of moles of NH₄NO₃ = 1.2 mol
Molarity of solution = 6 M
Volume of solution = ?
Solution:
Formula:
Molarity = number of moles / volume of solution
by putting values,
6 M = 1.2 mol / Volume
Volume = 1.2 mol / 6 mol/L
Volume = 0.2 L
convert 0.0054 Megasec (Msec) to Hectosec (Hsec)
i'm very confused with conversions in general but if someone could solve this and explain a little that'd be SO SWAG.
An airplane traveling 245 m/s east experienced turbulence, so the pilot decided to slow down to 230 m/s. It took the pilot 7 seconds to get down to this speed. What is the acceleration of the plane? (Round your answer to the nearest integer.)
–2 m/s2
2 m/s2
67 m/s2
–67 m/s2
The acceleration of the plane : -2 m/s²(negative=deceleration)
Further explanationGiven
vo=245 m/s
vt=230 m/s
t = 7 s
Required
The acceleration
Solution
Motion with constant acceleration
[tex]\tt v_t=v_o+at[/tex]
Input the value
[tex]\tt 230=245+a.7\\\\-15=7a\Rightarrow a=-2.14\approx rounded~-2~m/s^2[/tex]
Answer:
-2m/s²Explanation:
Edge 2020
How many moles are in 1.806 x 1024 molecules of bromine?
2.999 mol Br
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
1.806 × 10²⁴ molecules Br
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 1.806 \cdot 10^{24} \ molecules \ Br(\frac{1 \ mol \ Br}{6.022 \cdot 10^{23} \ molecules \ Br} )[/tex] = 2.999 mol Br
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
Our final answer is already in 4 sig figs, so there is no need to round.
Answer:
[tex]\boxed {\boxed {\sf About \ 2.999 \ moles \ of \ bromine}}[/tex]
Explanation:
To convert from moles to molecules, we must use Avogadro's Number.
[tex]6.022*10^{23}[/tex]
This tells us the number of particles (atoms, molecules, ions, etc) in 1 mole. In this problem, the particles are molecules of bromine in 1 mole of bromine.
[tex]6.022*10^{23} \ molecules \ Br / 1 \ mol \ Br[/tex]
1. Convert from moles to molecules
Use Avogadro's number as a fraction or ratio.
[tex]\frac{6.022 *10^{23} \ molecules \ Br}{1 \ mol \ Br}[/tex]
Multiply this fraction by the given number of bromine molecules.
[tex]1.806 *10^{24} molecules \ Br *\frac{6.022 *10^{23} \ molecules \ Br}{1 \ mol \ Br}[/tex]
Flip the fraction so the molecules of bromine can cancel out.
[tex]1.806 *10^{24} \ molecules \ Br* \frac{1 \ mol \ Br}{6.022 *10^{23} \ molecules \ Br}[/tex]
[tex]1.806 *10^{24} * \frac{1 \ mol \ Br}{6.022 *10^{23}}[/tex]
Multiply and condense the expression into 1 fraction.
[tex]\frac{1.806 *10^{24} \ mol \ Br}{6.022 *10^{23} }[/tex]
Divide.
[tex]2.999003653 \ mol \ Br[/tex]
2. Round
The original measurement, 1.806*10^24 has 4 significant figures (1, 8, 0, and 6). We must round our answer to 4 sig figs. For the answer we found, that is the thousandth place.
[tex]2.999003653 \ mol \ Br[/tex]
The 0 in the ten-thousandth place tels us to leave the 9 in the thousandth place.
[tex]\approx 2.999 \ mol \ Br[/tex]
There are about 2.999 moles of bromine in 2.806 *10^23 molecules.
Which type of matter would transmit sound
waves fastest?
A. air at 5°C
B. air at 20°C
C. ice at 0°C
.D. seawater at 20°C
C.ice at 0 degree
Explanation:
because sound transmit faster in solid medium as there molecules are cosely packed
Answer:
The Answer to this question is given below in this explanation section.
Explanation:
"C" option is correct
"ice at 0°C"
sound waves can only travel through a solid,liquid or gas medium.They travel fastest in solids,then liquid and slowest in gases.
Three phases of matter(gas,liquid and solid) sound wave travel in the slowest through gases fastest through solids.Sound wave need to travel through a medium such as solid liquid and gases.The sound wave move through each of these medium by vibrating the molecule in the matter.The molecule in solid are packed very tightly.Liquid as not packed are tightly.And gases are very loosely packed.This enables sound to travel much faster through a solid than gas.Sound travel about four time faster and further in water than it does in air.Sound waves travel about thirteen times faster in wood than air.They also travel faster on hotter days as the molecule bump into each other more often then when it is cold.Sound travels more quickly through solid then through liquids and gases because the molecules of a solid are closer together and,therefore can transmit the vibration faster.sound travels most slowly through gases because the molecule of a gas are farthest apart.
Refer to the electron distribution to answer 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹. What would be the period or series number of the atom?
A.6
B.5
C.4
D.3
I need the answer now plss help
C.5
Given:
Electron distribution: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹.
A number of electrons present in valence shell of penultimate Shell represents the group of elements.
For s block elements: No. of group=number of valence shell electron.
p block elements: no. of group= 2 + 10 + number of valence electrons.
d block elements: no. of group= number(n-1)d electrons + number of electrons in nth shell.
Here, the differential electron is in p orbital hence, it belongs to p block
No. of group= 2+ 10 + 3=15 i.e. 15th group or VA group.
Therefore, the correct option is B.
Learn more:
brainly.com/question/749030
What is at the center of every atom?
an electron
a compound
a molecule
a nucleus
#2 - Which two particles make up the nucleus of an atom? *
protons and electrons
protons and neutrons
molecules and compounds
neutrons and electrons
#3 - What is the role of an electron in an atom? *
electrons live inside the nucleus and carry a neutral charge
electrons circle the nucleus and have a positive charge
electrons circle the nucleus and have a negative charge
electrons live inside the nucleus and have a negative charge
#4 - In an atom, what is the number of protons equal to? *
the number of electrons
the number of neutrons
the number of molecules
the number of nuclei
#5 - Which of the following determines the type of element that an atom makes? *
the size of the nucleus
the number of protons
how much the atom weighs
the number of neutrons
#7 - What is a compound? *
the center of an atom that is formed by neutrons, protons, and electrons
a tiny particle that makes up all matter
a molecule that is formed from two or more different types of atoms.
a molecule that is formed from the same type of atoms
The annswer are -
1. the center of an atom is a nucleus
2. protons and neutrons
3. electrons circle the nucleus and have a negative charge
4. the number of electrons
5. the number of protons
7. a molecule that is formed from two or more different types of atoms.
What is the explanation for these?1. The nucleus is at the center of every atom and contains protons and neutrons, while electrons orbit around the nucleus.
2. Protons and neutrons make up the nucleus of an atom, providing mass and stability.
3. Electrons circle the nucleus in specific energy levels and have a negative charge, playing a role in chemical bonding and interactions.
4. The number of protons in an atom is equal to its atomic number and determines the element it belongs to.
5. The number of protons in an atom specifically determines the type of element it represents.
7. A compound is a molecule formed from different types of atoms, combining chemically to create a new substance.
Learn more about atom at:
https://brainly.com/question/17545314
#SPJ6
PLEASE HELP!! ASAP!! WILL MARK BRAINLIEST!!!
Which physical property is found in alkali metals that isn't found in alkaline earth metals?
Question 6 options:
Alkali metals have two electrons in their outer orbital.
Alkali metals bond directly with carbon to form carbides.
Alkali metals are soft and have low melting points.
Alkali metals are diamagnetic.
Answer:
Alkali metals are soft and have low melting points.