Explanation:
In a normal heart, there is a balance between calcium and potassium ion levels in both the outer and inner walls of the heart. That balance keeps electrical energy flowing correctly through the heart, and allows the heart muscle to expand and contract as the heart beats.10-Nov-2005
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The color of the explosive mixture is yellow, green, and red-orange. Explain how the colors are formed and which three metals were most likely present in the rocket??
Answer:
m
Explanation:
11) What is the relationship between temperature and the speed of sound? Include the concept of molecule
vibration in your explanation.
Answer:
Temperature is another condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy and can vibrate faster and allow sound waves to travel more quickly. The speed of sound at room temperature air is 346 meters per second.
what kind of state is a roller coasters are the best use of Newton's laws of motion
I am slightly unsure on the question, but if you are asking what kind of "statement" is "roller coasters are the best use of Newton's laws of motion" then the following should answer your question:
Answer:
An opinion.
Explanation:
In physics, Sir Isaac Newton's first law of motion is known as law of inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
The statement, "Roller coasters are the best use of Newton's laws of motions" is an opinion because it is not based on any evidence, facts, or proof to back it up.
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Examine the molecules below.
Circle the molecules that can also be classified as compounds.
Answer:
the last one is an element rest all are compounds
Explanation:
compounds are 2 or more different atoms that are joined chemically in a fixed proportion
hope it helps : )
2HCI total bond energy
Answer:
It's the oxygen + hydrogemity =the 2 +2=4 but the 4 is a oxygen so its 5
Balance the equation:
Ca(PO4)2 + SiO2 = P4O10 + CaSiO3
Answer:
2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3.
Which of these human activities is most likely to cause the excessive growth of Phytoplankton in the world’s oceans? Choose the best 2 answers.
The use of chemical fertilizers that are carried by runoff into rivers
The use of chemical fertilizers that are carried by runoff into rivers
The mining of fossil fuels, which requires digging underground tunnels
The mining of fossil fuels, which requires digging underground tunnels
The spraying of chemical herbicides that reduce carbon dioxide in the air
The spraying of chemical herbicides that reduce carbon dioxide in the air
The logging of old-growth forests, which results in erosion
The logging of old-growth forests, which results in erosion
Using fertilizers on your lawns
Answer:
The use of chemical fertilizers that are carried by runoff into rivers
The use of chemical fertilizers that are carried by runoff into rivers
Draw diagrams to show the arrangement of particles in a
Salid a liquid, and a gas
Answer:
solid(particles are rightly packed)
liquid(particles are losely packed)
gas(particles move freely)
Explanation:
there u go, hope it helps
Please help one of my friends is trying to be cool but I'm scared that they could get really hurt!
can your skin get burnt if you light hand sanitizer on fire on your skin!
Answer:
The answer is :No It won't burn.
1. New ground begins as barren rock. This rock is covered in lichens, mosses, and ferns. Eventually soil forms. This is the beginning of which process?
Aquatic Succession C Primary Succession
B Secondary Succession D Eutrophication
Answer: ion no cant cap
Explanation:
Multicellular plants and animals have organs with specific functions.
Which structures do eukaryotic cells have for performing specific functions? ASAP!! PEOPLE! PLZ
Answer:
Organelles.
An organelle in a cell is sometimes compared to an organ or organs in organisms.
Which of the following is a limitation of Bohr's model?
Bohr's model failed to explain the behavior of any atom
Bohr's model could not explain how electrons became excited
Bohr's model was able to explain the chemical behavior of only non-metals
Bohr's model was not able to explain the chemical behavior of any atom besides hydrogen
Answer:
The answer is:
The first option
Explanation:
QUICK QUESTION: why is there 2 hydrogen in the periodic table? I noticed that there’s one hydrogen in group 1 and another in group 17.
Answer:
one is H and the other is HE
Explanation:
H (in group one) stands for Hydrogen, as for He (group 18) stands for Helium
why do atoms emit light energy according to the bohr model?
Answer: According to the Bohr model, atoms emit light because excited electrons are returning to lower energy states, emitting the energy difference. This energy always has a specific wavelength because the electrons can only exist in set orbits. ... An emission spectrum is the frequencies of light emitted from an atom.
Explanation:
Atoms emit light energy because electrons transit between energy levels by absorbing energy and relaxing by emission of radiation.
What is Bohr's model of atom?According to Bohr model of atom the electrons are revolving around the nucleus through the circular paths of fixed energies. These circular paths are called orbits.
Using this model the momentum and velocity of an electron and the atomic radius can be determined. Bohr, states the electrons are able to transit between these energy level and the energy difference between the two energy levels will be equal to the energy of a photo absorbed by the atom.
Electrons excite to higher energy level by by absorbing energy and they cant stay there for long while and relax back to the ground state by emitting a the radiation which is complementary wavelength to the absorbed one. That's why the atoms emit light.
To find more on Bohr's model , refer here:
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The products of a neutralization reaction are ________ and ________ a salt.
Answer:
Neutralization reaction is a type of chemical reaction in which an acid and a base react together to form a salt and water as product.
Explanation:
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If a material is at. the particles in the material are not moving and do not have kinetic energy.
Answer:
Equilibrium
Explanation:
Definition: "A particle is in equilibrium provided it is at rest if originally at rest or has a constant velocity if originally in motion. Most often, static equilibrium is used to describe an object at rest"
Using the periodic table, explain which pair of the following gases have the most similar properties and why. Nitrogen (N), Fluorine (F), Neon (Ne), Krypton (Kr), and Oxygen (O).
Elements that belong to the same group of the periodic table (column) have similar properties. This is because elements of the same group have the same amount of valence electrons. This means that chemically and especially in a chemical reaction (or lack thereof), they will behave similarly.
Neon and Krypton are the only two gases in the list given that belong to the same group of the periodic table (Group 18 - Noble Gases) and as such have similar properties.
Similar Properties of Neon and Krypton:
- Both have 8 valence electrons - They both are very stable and almost unreactive- Both are gases at RTP-Both are odorless, colorless, and tasteless until interaction with an electrical charge.A skateboarder is going down a ramp. Which statements about the energy of the skateboarder are correct
I couldnt see any choices but if any of the awnsers mention the skateborder having pontential energy turning into kinetic energy that one would be right
Oil is less dense than water. What happens when you mix the two liquids together?
(A) Oil sinks to the bottom of the container.
(B) The two become one smooth mixture.
(C) The oil floats on top of the water.
(D) The water turns to gas inside the oil.
Answer:
(C) The oil floats on top of the water
Explanation:
If an object/substance is less dense than water it will float on the water.
If an object/substance has the same density as water it will stay submerged in the water, but will not sink to bottom.
If an object/substance is more dense than the water it will sink to the bottom.
Calculate the mass of 1.5 moles of calcium atoms
Answer:As we know that, one mole is equal to the one gram atom which is also equal to the molar mass. Therefore, the mass of 1.5 gram atom of calcium is 60 gram.
Explanation:
Brailiest pls
An example of a small region that geographers might study is Chinatown
in San Francisco.
Answer: san francisco
Explanation:
NEED HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
C- Na Al wouldnt make sense so it would be either mg or Na but Na has only one electron
Two raw materials used in the manufacture of polythene
crude oil and natural gas
Describe Bohr's atomic model
Answer:THE Bohr's atomic model is an atom as a smal, positively charged nucleus surrounded by electrons . have a good day
Convert 2.68 mol H2O to molecules H2O
Timed test
the two main division of solid structures are crystalline and what?
Answer:There are two main categories of solids—crystalline solids and amorphous solids. Crystalline solids are those in which the atoms, ions, or molecules that make up the solid exist in a regular, well-defined arrangement.
Explanation:
brainliest pls
Combustion produces carbon dioxide which is a greenhouse gas
O True
O False
Answer:
true
Explanation:
Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
If an airplane has parts that function like
a person's parts, then what part of the body does the pilot represent?
Explain your reasoning.
Answer:
Obtaining a Medical Certificate. Most pilots must have a valid medical certificate to exercise the privileges of their airman certificates. Glider and free.
Explanation:
Aviation safety relies heavily on maintenance. When it is not done correctly, it contributes to a significant proportion of aviation accidents and incidents. Some examples of maintenance errors are parts installed incorrectly, missing parts, and necessary checks not being performed.
Change Worksheet
answer the following questions.
The graph was drawn from data collected as a substance was heated at a constant rate. Use the graph to
180
160
Phase Change Diagrarn
140
120
Temperature (°C)
100
D
B
स
80
60
40
2
4
6
8
16
18
20
22
10 12 14
Tim e (minutes)
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has
Deontz_ volume and __ha2_shape. With each passing minute,
is added to the
substance. This causes the molecules of the substance to me more rapidly which we detect by a
t2 Maturise in the substance. At point B, the temperature of the substance is __°C. The solid
begins to_A
At point C, the substance is completely or in a mate state.
Material in this phase has_Det volume and
shape. The energy put to the substance
between minutes 5 and 9 was used to convert the substance from a 3D
This heat energy is called the latent heat of fusion. (An interesting fact.)
to a
to a
Between 9 and 13 minutes, the added energy increases the du of the substance. During the
time from point D to point E, the liquid is
By point E, the substance is completely in the
phase. Material in this phase has
volume and
shape. The energy put to the substance between minutes 13 and 18 converted the substance from a
state. This heat energy is called the latent heat of vaporization. (An
interesting fact.) Beyond point E, the substance is still in the
phase, but the molecules
are moving
as indicated by
the increasing temperature,
Substance Melting point Boiling point
Bolognium
20°C
100 °C
Which of these three substances was likely used in this
Unobtainium
40°C
140 °C
phase change experiment?
Foosium
70 °C
140°C
ONUS: For water, the value for the latent heat of vaporization is 6.8 times greater than the latent heat of fusion. Imagine we were
ding heat at a constant rate to a block of ice in a beaker on a hot plate, and it took 4 minutes for the ice to melt completely. How
uld it take, after the water started boiling, for the beaker to be completely empty (the liquid water totally converted to water van
what is the charge of the cadmium cation
Answer:
In its compounds cadmium exhibits almost exclusively the +2 oxidation state, as in the colourless Cd2+ ion, which forms a number of stable complex ions, especially halide complexes.
Explanation: