Explanation:
Gravitational potential energy
= mgh = (45kg)(9.81N/kg)(2m) = 882J.
The sled’s potential energy is 882 J.
Potential energy
The potential energy of the sled is calculated using the following formula as shown below;
P.E = mgh
Where;
m is the mass of the sled = 45 kgg is acceleration due to gravity h is the heightP.E = 45 x 9.8 x 2
P.E = 882 J
Thus, the sled’s potential energy is 882 J.
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Help meeee I don’t understand
Answer:
unbalanced moving to the right is the awnser
Answer:
unbalanced moving to the right i think
Explanation:
2b. 12 grams of C8H18 react with oxygen to produce carbon dioxide and water. How many grams of CO2 are produced?
12.4
13.5
11.6
37.1
Other:
Answer:
37.1g are produced
Explanation:
The combustion of C₈H₁₈ is:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
Where 1 mole of C₈H₁₈ produce 8 moles of CO₂
To find the mass of CO₂ that is produced we need to convert the mass of C₈H₁₈ with molar mass. Then, with the chemical equation, we can find the moles of CO₂ and its mass, as follows:
Moles C₈H₁₈ -Molar mass: 114.2g/mol-
12g C₈H₁₈ * (1mol / 114.2g) = 0.105 moles of C₈H₁₈
Moles CO₂:
As 1 mole of C₈H₁₈ produce 8 moles of CO₂, 0.105 moles of C₈H₁₈ produce:
0.105 moles of C₈H₁₈ * (8moles CO₂ / 1mole C₈H₁₈) = 0.84 moles of CO₂
Mass CO₂ -Molar mass: 44.01g/mol-:
0.84 moles of CO₂ * (44.01g / mol) = 37.0g of CO₂ ≈
37.1g are producedWhat is the molecule that formed between B and F?
Answer:
Hydrogen bond strengths range from 4 kJ to 50 kJ per mole of hydrogen bonds. In molecules containing N-H, O-H or F-H bonds, the large difference in electronegativity between the H atom and the N, O or F atom leads to a highly polar covalent bond (i.e., a bond dipole).
Explanation:
I need help on either question you can answer. Thank you god bless
1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons
neutrons = mass number-atomic number
Atomic mass Cl-37= 17
Mass number Cl-37=37
Neutrons = 37-17=20
2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...
[tex]\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1[/tex]
3. The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
f = c / λ, so :
[tex]\tt E\approx f\approx \dfrac{1}{\lambda}[/tex]
Energy is directly proportional to frequency and inversely proportional to the wavelength
So, as the frequency of photon increases, the energy of photon increases
4. Based on answer number 3 :
A. The wavelength becomes longer, and the energy decreases
1. Shankar and Sameer performed an experiment to differentiate primary, secondary and tertiary amines in a laboratory.Shankar correctly identified those 3 compounds but Sameer could only identify primary amine. a) What may be the reagent used by Sameer 1) Ammonical Silvernitrate solution 2) Chloroform & Caustic potash 3) Aqueous Copper Sulphate solution
Answer: 2) Chloroform & Caustic potash
Explanation:
The carbylamine reaction is a kind of chemical test which is done to detect primary amines in an unknown solution. It cannot detect secondary and tertiary amines.
The reaction involves the heating with up of the unknown solution with alcoholic potassium hydroxide or caustic potash and the chloroform.
In the presence of primary amine, the production of isocyanide results.
why can fluids flow but solids can’t?
Answer:
Fluids can flow because their molecular structure is different. Instead of being tightly packed, like a solid, there are fewer molecules per unit in a liquid than a solid. This gives the molecules of a liquid space to move around, and it flows because liquids take the shape of their container(s). These molecules usually tend to bump into each other and this causes the liquid to move as well
Answer:
Because the particles don't move, solids have a definite shape and volume, and can't flow. LIQUIDS - This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container.
Explanation:
hope this helps
What is the relationship between Force and Velocity?
Affect/Effect
Cause/Blame
Claim/Reasoning
Cause/Effect
Answer:
Cause/ effect relationship.
Explanation:
because the force is the cause of energy that is present and velocity is the effect (speed) that is present.
What is the mass of 2.25 mol of the element Iron (Fe)?
Choose the correct set up from the given choices.
a. You would divided 2.25 mol by (55.84 mol divided by 1 gram)
b. You would multiply 2.25 mol by (1mol divided by 55.84 g)
c. You would multiply 2.25 mol by (55.84g divided by 1 mol)
d. You would divide 2.25 mol by (1 mol divided by 55.84g)
Mole measure the number of elementary entities of a given substance that are present in a given sample. To find mass of 2.25 mol of the element Iron (Fe), we multiply 2.25 mol by (55.84g divided by 1 mol). Therefore option c is correct option.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance.
Mathematically,
Mole of Fe element= mass of Fe element÷ Molar mass of Fe element
mass= Mole of Fe element ×Molar mass of Fe element
Substituting the given values in above formula we get
mass= 2.25 mol× 55.84 g/mole
mass= 2.25 mol× 55.84 g/mole
To find mass of 2.25 mol of the element Iron (Fe), we multiply 2.25 mol by (55.84g divided by 1 mol).
Therefore option c is correct option.
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Choose two different particles found in the air. Explain how they are different and how they are the same
Answer:
Dust and smoke.
Explanation:
Dust and smoke are two different particles present in the air. Dust and smoke are different from one another due to their origin. Smoke formed from burning of materials while dust refers to the soil particles lifted by the wind due to their light weight. Dust and smoke are similar to each other due to their small in size, infinite number means uncountable and light weight.
Air is a mixture of gases and consists of dust particles and water vapor. It consists of small to very large size of particles. Some of them include dust pollen, soot, and liquid droplets.
Dust and soot particles of the air are different as the soot is a fine black particle of carbon and tar. It is made by the incomplete combustion of air. While dust is fine dry particles of matter.Hence they both differ.
Learn more about the two different particles found in the air.
brainly.in/question/35683807.
b. How do metals and non-metals differ chemically?
1
Careless work, fraud, biases, confirmation bias, are all examples of ________________.
Question 10 options:
poor science
good science
higher level science
popular science
Answer:
Poor Science
Explanation:
I took the quiz also just think that doesn't seem like a good, higher level scientist, or popular one, SO THERE YOU GUYS GO!!!
Answer:
poor science
Explanation:
fountain
21. Calculate the quantity of electricity
in coulombs used when a current of
2.7 ampere is passed through a
solution of silver salt for 25 minutes
20 seconds
A. 87.5
B. 206
C. 1350
D. 4050
E. 4104
Answer:
4104 Coulombs
Explanation:
charge = time(sec) *current
25*60 =1500+20=1520
2.7A * 1520 sec =4104
4104 C
In a 3.7- gram sample, there are______ atoms of gold
1.1 × 10²² atoms Au
General Formulas and Concepts:Chemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Explanation:Step 1: Define
3.7 g Au
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Au - 196.97 g/mol
Step 3: Convert
[tex]3.7 \ g \ Au(\frac{1 \ mol \ Au}{196.97 \ g \ Au} )(\frac{6.022 \cdot 10^{23} \ atoms \ Au}{1 \ mol \ Au} )[/tex] = 1.13121 × 10²² atoms Au
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
1.13121 × 10²² atoms Au ≈ 1.1 × 10²² atoms Au
Aluminium and oxygen react to produce aluminium oxide,
4 Al + 3 02 - 2 AL,O
How many kilograms of aluminium oxide are formed when 5,4 kg of aluminium react
with excess oxygen?
A 5,4 kg
B 88 kg
C 10.2 kg
D 33,6 kg
The balanced reaction is
4 Al + 3 O₂ → 2 Al₂O₃
so that for every 4 moles of Al and 3 moles of O2, you end up with 2 moles of Al₂O₃.
• Al has molar mass ≈ 26.982 g/mol
• O has molar mass ≈ 15.999 g/mol
• Al₂O₃ thus has molar mass ≈ 101.961 g/mol
You start with 5.4 kg = 5,400 g of Al, or
(5.4 kg Al) • (1/26.982 mol/g) ≈ 200.133 mol Al
Al₂O₃ is produced in a ratio of 2 moles to every 4 moles of Al, so you end up with about 100.067 mol Al₂O₃, which has a mass of
(100.067 mol Al₂O₃) • (101.961 g/mol) ≈ 10,202 g = 10.2 kg
so the answer is C.
What is the molar mass of phosphorus pentachloride and uranium hexafluoride?
Answer:
PCl₅ = 208.22g/mol. UF₆ = 352.03g/mol.
Explanation:
Find the atomic mass of each element–and if there's a subscript (you multiply the atomic mass by that much). P= 30.97g, Cl= 35.45g; 30.97+35.45(5) = 208.22g [same idea with UF₆]
Help pls!
How can you use a chemical reaction to remove a contaminant from a solution?
Answer:
reverse osmosis
Explanation:
Water treatment is often complicated because it deals with the chemical makeup of the water, which varies widely. The first step is to determine what contaminants should be removed. Unfortunately, this is not always a straightforward process. Many contaminants make themselves known in obvious ways, such as iron or hydrogen sulfide, which can cause taste and odor issues. Other contaminants, such as arsenic or pesticides, are only uncovered through a sophisticated laboratory analysis.
It is important to test the water so that the right type of treatment system can be selected. Keep in mind, however, that more than one analysis may be necessary to get a baseline because water quality fluctuates. More information on possible contaminants in a specific area can be obtained by talking to residents, the local health department, the water department, or the state geological society. In addition, your laboratory should be able to recommend appropriate tests based on a customer’s concerns and the information provided about the water source. It is important not only to address customers’ concerns but also to educate them about potential contaminants they may not have considered.
When using a light microscope, focus the specimen with the scanning objective
lens first.
Reasoning:
Answer:
The light microscope bends a beam of light at the specimen using a series of lenses to provide a clear image of the specimen to the observer.
someone help me plz :))) brainliest
Answer:
Option 2
Explanation:
what unit is a wave velocity measured in
Answer:
radians
Explanation:
Answer:
Meters per second.
Explanation:
Ap3x approved
If you have 6.02x10^23 molecules of trisulfur monoxide, how many grams would it weigh?
Answer:
112.18 g.
Explanation:
you're using stoichiometry to find the mass of the compound S₃O.
How many milliliters of sodium metal, with a density of 0.97 g/mL, would be needed to produce 34.5 grams of sodium hydroxide in the single replacement reaction below?
Unbalanced equation: Na + H2O ---> NaOH + H2
Volume of Sodium metal : 20.454 ml
Further explanationReaction(balanced) :
2Na + 2H₂O → 2NaOH + H₂
mass NaOH = 34.5 g
mol NaOH(MW=40 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{34.5}{40}\\\\mol=0.8625[/tex]
From the equation, mol ratio of Na : NaOH = 2 : 2, so mol Na=mol NaOH=0.8625
Mass Na (Ar=23 g/mol):
[tex]\tt mass=mol\times MW\\\\mass=0.8625\times 23\\\\mass=19.84~g[/tex]
Volume Na :
[tex]\tt V=\dfrac{m}{\rho}\\\\V=\dfrac{19.84~g}{0.97~g/ml}\\\\V=20.454~ml[/tex]
balance the equation KCIO3 → KCl + O2
Answer:
3kcl+ 02
Explanation:
in this way we can balance the chemical equation
Plz help I will help give brainliest the last option is 4
What property would you use to describe Oxygen and Hydrogen in their natural form?
Answer:
At standard temperature and pressure, hydrogen is a colorless, odorless, and tasteless gas. Hydrogen is very flammable and burns with an invisible flame. It burns when it comes into contact with oxygen. The byproduct of a hydrogen and oxygen explosion is water or H2 O.
Which change will produce a new substance
Answer:
Chemical change
Explanation:
Because it will be 2 mixtures of each substances making it 1 substance, and 1 change.
What would happen if a proton, an electron, and 2 neutrons were removed from Lithium (7)
Answer:
This would give us Helium 4.
Explanation:
Lithium7 has 3 protons, 4 neutrons and 3 electrons.
Removing 1 Proton 1 electron and 2 neutrons would form an element with
2 protons 2 electrons and 2 neutrons.
This is Helium 4.
Which of the following would increase the intensity of the tornado?
a. decrease in wind speed
b. decrease in condensation
c. increased rate of evaporation
d. increase of cold air
(oh no)
What is the mass of silicon when there are 1.8 x 10^21 atoms of silicon?
Answer:
Mass = 0.084 g
Explanation:
Given data:
Mass of silicon = ?
Number of atoms of silicon = 1.8 × 10²¹ atom
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1.8 × 10²¹ atom × 1 mole / 6.022 × 10²³ atoms
0.299× 10⁻² mol
0.00299 mol
Mass of silicon:
Mass = number of moles × molar mass
Mass = 0.00299 mol × 28.1 g/mol
Mass = 0.084 g
Which of the following pairs of half-reactions would have a negative total
reduction potential?
A. Copper (Cu) reduced, zinc (Zn) oxidized
B. Hydrogen (H) reduced, sodium (Na) oxidized
C. Mercury (Hg) reduced, iron(II) (Fe) oxidized
D. Silver (Ag) reduced, gold (Au) oxidized
Answer: silver reduced, gold oxidized
Explanation:
Answer:
D
Explanation:
determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
NUCLEAR CHARGE (20+)
ATOMIC MASS (40 amu)
given the relative charge of a proton =1+\ m1nucleon=1amu
Answer:
detail is given below.
Explanation:
The charged particles of nucleus are protons while neutrons are neutral having no charge.
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus.
Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.
one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.
While the atomic number is 20.