Answer:
Van der Waals forces is defined as the force that include attraction and repulsions between atoms or molecules, and also involve intermolecular forces
Vander Waals force formed between the similar molecules and not different molecules, that means Van der Waals force exist between two water molecules and not between hydrogen and oxygen of one molecule. Hydrogen and oxygen are connected with covalent bonds.
A dolphin travels a distance 20 miles up the coastline in 153 minutes.If 1 mile is equal to 1609 meters,then what is the dolphins average speed in meters/seconds rounded to the nearest tenth?
Answer:
The dolphins average speed is 3.51 [tex]\frac{meters}{seconds}[/tex]
Explanation:
First of all, the following rules of three should be applied:
If 1 mile is equal to 1609 meters, 20 miles are equal to how many meters?[tex]distance=\frac{20 miles*1609 meters}{1 mile}[/tex]
distance=32,180 meters
If 1 minute is equal to 60 seconds, 153 minutes is equal to how many seconds?[tex]time=\frac{153 minutes*60 seconds}{1 minute}[/tex]
time= 9,180 seconds
Speed is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it. That is, speed implies the change of position of an object in space within a certain amount of time and is calculated as:
[tex]speed=\frac{distance}{time}[/tex]
So in this case the velocity is calculated as:
[tex]speed=\frac{32,180 meters}{9,180 seconds}[/tex]
Solving, you get:
Speed= 3.51 [tex]\frac{meters}{seconds}[/tex]
The dolphins average speed is 3.51 [tex]\frac{meters}{seconds}[/tex]
Brent is doing research to make a type of baby bottle out of plastic that is free from harmful chemicals. What type of research is this?
Applied
Descriptive
Quantitative
Experimental
Answer:
Applied
Explanation:
Since Brent is using his existing scientific knowledge to create a new product or invention then this falls under the category of Applied Research. Applied research includes using any theoretical or proven information in order to create something physical that can be used in our real-life world. Usually, this research focuses on solving a problem through the use of technology. Thisis exactly what Brent is trying to do by creating a new plastic that does not have harmful chemicals that can hurt babies in the long term.
Answer:applied
Explanation:
How does the number of tin atoms in the sample compare to the number of aluminum atoms in a 20 gram sample of each (Sn:Al)
The number of Al atoms is greater than the number of Sn atoms
Further explanationGiven
20 gram sample of Tin and Aluminum
Required
Number of atoms
Solution
1 mol = 6.02 x 10²³ particles (atoms, molecules, ions)
So the number of atoms of each element is determined by the number of moles. The greater the number of moles the greater the number of atoms
moles Sn-Tin(Ar = 118,71 u)mol = mass : Ar
mol = 20 : 118,71 u
mol = 0.168
moles of Al-Aluminum(Ar=26.9815 u)mol = 20 : 26.9815 u
mol = 0.741
So the number of Al atoms > number of Sn atoms
how many moles of sodium are present in a sample of sodium having a mass of 137 g? (molar mass is 23.0g)
Answer:
5.95 moles
Explanation:
No of moles = given mass / molar mass
No of moles = 137/23
= 5.95 moles
at stp what is the volume of 5.35 moles of methane ch4
Answer:
22.4 L
Explanation:
You are running late to school and need to go 1,500 m in 10 minutes. What speed will you travel?
10 m/min
15 m/min
150 m/min
O 1 m/min
Answer:
15 m/min
Explanation:
You take the 1500 divide by 10 and your answer is 15
Which combination of elements produce compounds with a large electronegativity difference and high conductivity?
Answer:
C. H2(g)
Explanation:
Help Please ! A substance that flows to the bottom of its container. Which option accurately describes this substance:
A) It can be a liquid or a solid
B) It is a solid or a gas
C) It is a gas
D) It is a liquid
Answer:
It is a solid or gas
Explanation:
solid or gas flow to the bottom of its container
Will get brainliest.
Answer:
1.00 g
Explanation:
got it on pex
1) Which electrons are involved in bonding between atoms?|
Answer:
VALENCE ELECTRONS are involved in the bonding of atoms
Explanation:
Hope that helps
Question 6
Use the mole concept to calculate the number of formula units that are in a 1.75-mol sample of NaCl.
Answer: There are [tex]10.5\times 10^{23}[/tex] formula units in 1.75 mol sample of NaCl.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
1 mole of NaCl contains = [tex]6.023\times 10^{23}[/tex] formula units
Thus 1.75 mol of NaCl contains = [tex]\frac{6.023\times 10^{23}}{1}\times 1.75=10.5\times 10^{23}[/tex] formula units
Thus there are [tex]10.5\times 10^{23}[/tex] formula units in 1.75 mol sample of NaCl.
what part of the atom determines what kind of reaction an element will have ?
Which bond is most polar?
ОА СО
ов So
Осно
ODNO
Answer:
either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize
Brianna explains to Logan the role of plants in the carbon cycle. Choose the sentence(s) that she includes in her explanation. Select all that apply.
A.
Animals get carbon from plants.
B.
Plants take carbon from the soil.
C.
Photosynthesis uses carbon monoxide.
D.
Animals take carbon from the atmosphere.
E.
Plants take carbon from the atmosphere.
Answer:
E) Plants take carbon from the atmosphere
Explanation:
Plants are a vital part in keeping the air clean. They take in CO2, H2O, and sunlight to start processing photosynthesis. The carbon taken in by the plant still remains with it after it dies, thus, fossil fuels.
Answer:
e is correct
Explanation:
Increasing the temperature of a given amount of gas at constant volume causes the pressure to increase because of _____.
1. there is less space where the molecules can move around
2. there are more molecules
3. the molecules are striking a larger area with less force
4. the molecules are moving more quickly
concept of mole chemistry question
Answer:
How many molecules of water are there in 54 g of H2O H 2 O ? Solution. Molar Mass of H2O H 2 O = 2 + 16 = 18 g/moles. So ,number of moles of H2O H 2 O = Mass/Molar Mass = 54/18 =3 moles. Now 1 moles = 6.022×1023 6.022 × 10 23 molecule.
NEED NOW!!
How does this picture represent the levels of
organization inside of plants and animals? Write atleast 2-3 sentences.
Answer:
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣧⣀⣀⣾⣿⣿⣿⣿
⣿⣿⣿⣿⣿⡏⠉⠛⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⣿
⣿⣿⣿⣿⣿⣿⠀⠀⠀⠈⠛⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⠛⠉⠁⠀⣿
⣿⣿⣿⣿⣿⣿⣧⡀⠀⠀⠀⠀⠙⠿⠿⠿⠻⠿⠿⠟⠿⠛⠉⠀⠀⠀⠀⠀⣸⣿
⣿⣿⣿⣿⣿⣿⣿⣷⣄⠀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣴⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠠⣴⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⡟⠀⠀⢰⣹⡆⠀⠀⠀⠀⠀⠀⣭⣷⠀⠀⠀⠸⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⠃⠀⠀⠈⠉⠀⠀⠤⠄⠀⠀⠀⠉⠁⠀⠀⠀⠀⢿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⢾⣿⣷⠀⠀⠀⠀⡠⠤⢄⠀⠀⠀⠠⣿⣿⣷⠀⢸⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⡀⠉⠀⠀⠀⠀⠀⢄⠀⢀⠀⠀⠀⠀⠉⠉⠁⠀⠀⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣧⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿
Explanation:
A 5.5 kg rifle fires an 11 g bullet with a velocity of 1000 m/s. (a) What is the recoil velocity of the rifle? (b) If the shooter holds the rifle firmly against his shoulder, What will be the recoil velocity? Assume the mass of the shooter is 120 kg.
Please answer seriously (;´༎ຶٹ༎ຶ`)
Given,
Mass of a rifle = 5.5 kg
Mass of a bullet = 11 g
Speed of a bullet = 1000 m/s
To find,
(a) The recoil velocity of the rifle.
(b) If the shooter holds the rifle firmly against his shoulder, What will be the recoil velocity.
Solution,
(a) Let v₁ is the recoil velocity of the rifle. We can use the conservation of momentum to find it. The momentum of the system will remains conserved.
[tex]m_1v_1=m_2v_2\\\\v_1=\dfrac{m_2v_2}{m_1}\\\\v_1=\dfrac{0.011\times 1000}{5.5}\\\\v_1=2\ m/s[/tex]
So, the recoil velocity of the rifle is 2 m/s and it is in opposite direction of he bullet.
(b) Let V is the recoil velocity if the shooter holds the rifle firmly against his shoulder. Again using the conservation of momentum.
[tex]V=\dfrac{0.011\times 1000}{120}\\\\v=0.091\ m/s[/tex]
Therefore, this is the required solution.
How many protons, neutrons and electrons are there in a neutral Cesium atom?
55 protons, 78 neutrons, 55 electrons
69 protons, 100 neutrons, 69 electrons
37 protons, 37 neutrons, 45 electrons
43 protons, 65 neutrons, 43 electrons
Answer:
55 protons, 78 neutrons, 55 electrons
Explanation:
In a neutral Cesium atom we have 55 protons, 78 neutrons and 55 electrons. This can be found on the periodic table of elements.
Protons are the positively charged particles within an atom
Neutrons do not carry any charges.
Electrons are the negatively charged particles.
The amount of these subatomic particles can be obtained from the periodic table of element.
For a neutral atom, the number of protons and electrons are the same.
Since the atomic number is 55, it is also the number of protons in the atom.
5
What substance would do the best job of cleaning pots and
pans?
A
A substance with a pH of 7
B
A substance with a pH of 2
C
A substance with a pH of 4
D
A substance with a pH of 8
Answer:
D . A substance with a pH of 8
Explanation:
pH stands for "Potential for Hydrogen." This is an indicator of a solution's acidity or alkalinity. It is also used to tell which chemicals are great for cleaning.
pH 7 and pH 8 are both considered "neutral pH," thus, solutions with these pH are often used as dishwashing detergents because they do not destroy the surfaces of objects. However, pH 8 is said to be more alkaline in nature. This allows it to destroy the residues, such as fats and oils, in pots and pans. It is the pH of baking soda.
CH4 + 202 → CO2 + 2H2O
How many moles of O2, needed to produce 36 grams of H20?
2.0 mol O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 36 g H₂O
Step 2: Identify Conversions
[RxN] 2 mol H₂O → 2 mol O₂
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 18.02 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 36 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O})(\frac{2 \ mol \ O_2}{2 \ mol \ H_2O})[/tex]Divide/Multiply: [tex]\displaystyle 1.99778 \ mol \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1.99778 mol O₂ ≈ 2.0 mol O₂
Identify one trait in a plant that could be changed with selective breeding and explain how the change would be useful? Science. I will give brainliest to people who answer correctly
The pic is the question! Please help
A photocopier is making reduced copies of a photo that measures 25 centimeters in height. The height of the first copy is 80% of the height of the original. Another copy is made using the first copy, and the height of this copy is 85% of the height of the first copy. Answer parts a and b.
Answer:The height of First Copy is 20 cm.
Step-by-step explanation:
Given:
Original Height = 25 cm
First copy is reduce to 80% of Original height.
Therefore to find the height of first copy can be find out by multiplying 80 with original height and then dividing by 100.
∴ Height of First Copy =
Hence Height of first copy is 20 cm
Now Another copy is reduce to 85% of First Copy.
Therefore to find the height of another copy can be find out by multiplying 85 with first copy height and then dividing by 100.
∴ Height of Another Copy =
Hence Height of Another copy is 17 cm
Explanation:
The first mass extinction that occurred between the Paleozoic and the Mesozoic Era,
caused the extinction of which organism?
O Wooly mammoth
O Dinosaurs
O Trilobites
Flying Reptiles
Answer:
O Trilobites
Explanation:
The first mass extinction that occurred between the Paleozoic and the Mesozoic era caused the extinction of the trilobites.
Extinction are catastrophic events that causes the loss of organisms on the earth surface. Several factors can lead to extinction.
The first mass extinction took place between the Paleozoic and the Mesozoic era. This wiped out one of the most successful organism on the earth surface at that time. They were the trilobites.When an atom is charged, it is called an ion. How many electrons are in O^2-?
Answer:
10 electrons
Explanation:
Atoms gain or lose valence electrons until they have the same number of valence electrons as the closest atmospheric gas
Calculate the heat evolved kJ for the reaction of
1.00 g of elemental sulfur.
Answer: Calculate the heat evolved (per mo SO2) for the reaction of sulfur with oxygen to form SO . Calculate the heat evolved from a reaction mixture of 13.4L SO at 1 ATM and 273K ... N-2 (g) + Os (g) → 2 NO (g) H = +180.6 kJ.
Explanation: I hoped that was helpful!
Yo can someone help me answer this
Answer:
D
Explanation:
You need both, independant and dependant variables for a hypothesis.
Which type of combination is a mixture?
A.
electrical
B.
chemical
C.
physical
D.
thermal
Answer:
C. physical
Explanation:
A mixture is a physical combination. Mixtures are combinations of compounds and molecules without any chemical reaction taking place.
Mixtures have the following properties:
They have an indefinite composition i.e they consist of two or more elements and or compounds in any proportion by massTheir constituents retains their identities i. e physical property is retained. Their constituents reacts differently to changed conditions. They are easily separated into constituents by physical methods