Find the area of a rectangle with a length of 10cm and a width of 7cm.
A.70cm
B.17 cm
C.17cm2
D.70cm2
Answer:
D
Explanation:
You would do 10*7 witch would be 70 then cm2 so the answer is 70cm2
how much electrons are present in MnO4-
calculate the atomic mass of carbon if the two common isotopes of carbon have masses of 12.000 amu (98.89% abundance) and 13.003 amu (1.11% abundance)
12.01 amu
Work:
(12.000 × .9889) + (13.003 × .0111) = 12.01
turn the precents into decimalsDoes temperature have the same effect on gases as it does on liquids when it comes to viscosity? Explain.
When the temperature of a liquid (fluid) decreases, its viscosity increases. What happens to this fluid?
As the temperature of a liquid (fluid) increases, its viscosity decreases. What happens to this fluid?
Why does ketchup flow faster when heated?
Answer: Explanation:
With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. ... With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.
liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
Summarize why error is important.
Answer:
To say to you that you've made a mistake
Explanation:
I NEED HELP WITH THIS ASAP!!!!!!!!!!!!!
Which chemical equation best represents the Law of Conservation of
Mass?
A. H+0 -> H20
B. H2 + 02 --> H20
C. 2H2 + 02 --> 2H,0
D. H2 + 02 --> 2H,02
Answer: The answer is B
Explanation:
Which particle changes to create a new element?
A.proton
B.neutron
C.electron
Answer: A
Explanation:
What is the total number of protons, electrons, and neutrons found in one atom of
iron, Fe, with a mass number of 56?
Answer:
The most common atom of iron has 26 protons and 30 neutrons in its nucleus
What would pressure be if volume was 0
Answer:
The lower the temperature, the lower the pressure inside of the sphere. If the exact values were plotted out, a linear relationship would be apparent. Extrapolating this line to the point where there would be no pressure yields absolute zero, which is about -273.15 degrees Celsius.
Explanation:
Liquids will boil at a higher temperature when they are at a lower elevation true or false ?
Which of these would have particles with the highest kinetic energy?
ice
water
water vapor
Answer:
water vapor
Explanation:
because gas molecules moves the fastest
Answer:
water vapor
Explanation:
Liquid water molecules have less freedom to move around. While molecules of water vapour have more freedom to move around as there is larger space between the molecules. Hence, the kinetic energy of water molecules is more as compared to the kinetic energy of liquid water
Part 1. Matching
Place the letter for the correct element category from the list below next to each description.
Part 2. Fill in the blank
Write the word or phrase that best completes each sentence. Choose from the following:
group, period, atomic number, periodic, metal, metalloid, nonmetal, chlorine, magnesium.
1. The elements on the periodic table are arranged in order of increasing _____________________.
2. The arrangement of the elements on the periodic table shows a predictable, repeating, ____________
pattern that allows us to predict chemical properties.
3. The elements Na, Mg, and Cu are each classified as ___________________ elements.
4. When elements are located in the same ______ they exhibit similar chemical and physical properties.
5. The element ________ is an example of an element that is classified as a nonmetal.
Part 3. Classifying
For each electron configuration identify the element and decide which group the element belongs to on the
periodic table. (Hint: Find the total number of electrons for each and refer to page 186 in your Student
Book to determine the element and group number.
Electron configuration Element Group number
1. 1s2
2s22p6.
2. 1s2
2s22p6
3s2.
3. 1s2
2s2
2p6
3s2
3p6
.
4. 1s2
2s2
2p6
3s2
3p6
4s2
.
5. 1s2
2s22p6
3s23p3.
A NATURAL APPROACH TO CHEMISTRY
_______
_______
_______
_______
_______ _______
_______
_______
_______
_______
1. ___ The element sodium (Na) belongs to this group of elements.
2. ___ These elements are not likely to chemically bond with other elements.
3. ___ These elements are located in the center of the periodic table.
4. ___ These elements tend to gain one electron to fill their outer shell and are sometimes colored gases.
5. ___ These elements have two electrons in their highest unfilled energy level.
Answer:
Try asking a friend or teacher
Explanation:
helps better than this site because alot of the answers are different even though they might of had the same test
how many particles are in 100ml
Answer:
▬▬▬.◙.▬▬▬
═▂▄▄▓▄▄▂
◢◤ █▀▀████▄▄▄▄◢◤
█▄ █ █▄ ███▀▀▀▀▀▀▀╬
◥█████◤
╩══╩═
╬═╬
╬═╬
╬═╬ Just dropped down to say
╬═╬ *add text here*(5.555 i think this right)
╬═╬
╬═╬☻/
╬═╬/▌
╬═╬/ \
:
please help its due at 2
Answer:
3. One example of condensation is dew forming on grass or leaves early in the morning when the air is cooled/cooling.
4. This is called freezing. For example, when water turns into ice (a solid) because it freezes.
5. This is called melting. The butter reached its melting point and turned into a liquid.
6. Adding or removing energy causes changes in states of matter. Temperature for example can cause melting and freezing.
7. Water which collects as droplets on a cold surface when humid air is in contact with it.
8. Evaporation/vaporization
9. before- particles are compact
during- particles vibrate
after- the particles move freely
10. condensation because it is going from gas into a liquid
11. Evaporation, I know because when liquid gets heated after a period of time and it reaches its boiling point, it will begin evaporating.
12. When a solid is heated the particles gain energy and start to vibrate faster and faster. ... Although the particles are still loosely connected they are able to move around. At this point the solid is melting to form a liquid. The particles in the liquid are the same as in the solid but they have more energy.
13. Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.
14. freezing because particles are becoming compact and getting slower because of decrease in temperature
15. Examples are mothballs, dry ice, snow in the winter months, freeze-drying (ice crystals in a frozen food bag), air fresheners, and printers that print out high-resolution images.
16. Try and think of it in terms of the molecules. The temperature is such that the molecules are all bound together into a solid. Occasionally a surface molecule picks up enough energy to break it bond,.. a statistical probability ,and drifts away. The overall temperature of the solid is reduced by that event,as temperature is just an average of the energy. A little more heat flows into the material ,from the ambient environment, and another molecule escapes, and so the process continues….. if the concentration of the molecules in the vapour space above the solid, is low the reverse process of molecules condensing onto the surface,and releasing energy back into the solid is low.
Explanation:
sorry it took a little bit, it wouldnt let me copy and paste what i had typed /:
7. Electrons that are free to move in a metal are referred to as ________ electrons.
A.magnetic
B.valence
C.electrostatic
D.cation
Answer:
D; Cation
They are the valence electrons that can move between two metal molecules.
Which particle changes to create an isotope of an atom?
A.proton
B.neutron
C.electron
Answer:
A
Explanation:
proton
what happens to the pen?what could have caused the pen's motion?
grade 8 asap
Answer:
One is tension force that acts on the string and the other one is gravitational force that is acting on the pen and is therefore, the one that pulls the pen towards the ground. Therefore, the pen's motion is caused by the unbalanced force acting on the pen.
how many grams of oxygen gas are produced when this sample is heated?
Answer: 2.92%
Explanation:
Contains elements carbon, hydrogen and oxygen, the empirical formula of butanedion is C2H3O and its molar mass is 86.09% find its empirical formula
Answer:
Molecular formula = C₄H₆O₂
Explanation:
Given data:
Empirical formula of butanedion = C₂H₃O
Molar mass of butanedion = 86.09 g/mol
Molecular formula butanedion = ?
Solution:
Formula:
Molecular formula = n(empirical formula)
n = molar mass of compound / empirical formula mass
empirical formula mass = 2×12 +1.008×3 +1×16 = 43.024
n = 86.09 / 43.024
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₂H₃O)
Molecular formula = C₄H₆O₂
When Silver (Ag) forms a metallic bond with other Silver atoms, what do the valence electrons move into? A. the all go to the same Silver atom B. the bond with the oxygen in the atomsphere C. they escape to free space D. the sea of electrons
Answer:
D. the sea of electrons
Explanation:
Metallic bonds are defined as the bonds formed between two or more metals. Silver atom form metallic bond with other silver atoms.
In metallic bond, the free electrons or valence electrons present in s and p orbitals delocalize. The valence electrons do not move around the atoms or enter the atoms whereas they form a sea of electrons in which they surround the nuclei (positively charged) of the metal ions interacting. The valence electrons are then freely move in the space between the atomic nuclei.
Hence, the correct answer is "D. the sea of electrons".
Explain how the mid-ocean ridge supports
the theory of sea floor spreading.
help plzzz:(
A substance has an atomic number of 80 and a mass number of 178. How many protons does this atom have? How many neutrons does it have? How did you determine this? Write your answer in ACES format.
Answer:
Cite (source and evidence):
Explain:
Summarize:
Answer:
This atom has 80 protons and 98 neutrons.
Explanation:
All atoms are composed of a central nucleus in which there are positively charged particles, the protons, and neutrally charged particles, the neutrons, around which other negatively charged particles, called electrons, move.
The atomic number, identified with the letter Z, indicates the number of protons that are present in the nucleus of an atom. The atomic number defines the electronic configuration of the atom and allows the ordering of the different chemical elements in the periodic table.
If a substance has an atomic number of 80, this atom has 80 protons.
The mass number indicates the total number of particles in the nucleus, that is, the sum of protons and neutrons.
mass number = number of protons + number of neutrons
In this case you know that the mass number is 178 and number of protons is 80. Then
number of neutrons=mass number - number of protons
number of neutrons= 98
So this atom has 98 neutrons.
Which of the following is NOT an example of a homogeneous mixture? a oxygen b tea c water d pizza
Urgent help meee ;(((
Answer:
C
Explanation:
A homologous series is a group of molecules with the same general formula and the same functional group.
Help please I’ll make you as brainlister 3
Answer:
It doesn't look like any of them but the best answer is SI
Explanation:
Why does a planet stay in orbit?
Answer:
Gravity
Explanation:
A planet is gravitationally pulled around the sun.
Answer:
beause of gravitys pull and because the atmosphere of the beyond lol also bcs this i hope this helps your welcome boo >3
Explanation:
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
An atom is neutral. Its nucleus contains two protons and two neutrons. How
many electrons does the atom have?
Answer: zero
Explanation:
its zero because when something is neutral is not on either team because with numbers there is positive numbers and negative numbers but zero isn't positive or negative so its neutral. ps: can I get branliest
describe the relationship between the mass volume and density of material
Answer: For a given mass and volume, how much physical space a material takes up, of an object or substance, the density remains constant at a given temperature and pressure. The equation for this relationship is ρ = m / V in which ρ (rho) is density, m is mass and V is volume, making the density unit kg/m3.
Explanation:
What is the first state of matter
Answer:
Plasma
Explanation:
Estimated to be 99.999% of the visible universe, cosmic plasma may be considered to be the first state of matter, that preceded the other states of matter in the history of the evolution of the Universe.
What is formed when a sodium atom and chlorine atom react chemically ?
Answer:
NaCl
Explanation:
NaCl is common table salt
Reacts together due to Na having a 1+ charge and Cl having a 1- charge
they bond together because their charges neutralize
Answer:
A neutron
Explanation:
WENOMECHAINSAMA TUMAJARBISAUN WIFENLOOOF ESELIFTERBRAUN
jk
its because they neutralize each other because one has a positive charge and one has a negative charge.