An atom has 30 protons, 30 neutrons, and 30 electrons. What is the charge of the atom’s nucleus?
A: +30
B: +60
C: -30
D: -90
Answer:
+30
Explanation:
The nucleus holds both protons and neutrons. Since a neutron is neutral there is no charge. Protons are a positive charge. so the atoms nucleus is +30.
The charge on an atom's nucleus is the same as the number of protons in the nucleus. The charge on the nucleus of the atom is +30.
The nucleus houses positive particles called protons. Each proton carries a charge of +1.
The magnitude of charge of the nucleus is the same as the number of protons in the nucleus.
Since there are 30 protons, the magnitude of charge of the nucleus is expected to be + 30.
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At present, fusion reactions... Group of answer choices produce the energy in some nuclear power plants. cannot be used to produce energy in reactors. produce the energy in all recent nuclear power plants. produce the energy in most nuclear power plants.
Answer:
cannot be used to produce energy in reactors.
Explanation:
Currently, there is no reactor that can allow the use of nuclear fusion, although nuclear plants use nuclear fission reactors.
Nuclear fusion happens when thousands of atoms collide with each other when they are in the midst of extreme conditions of literature and pressure. This collision causes the atoms to fuse, creating another element. The process releases amounts of light and heat, promoting a high release of energy. This whole process occurs without the release of CO2 into the atmosphere, without the release of toxic waste and without the risk of explosions, which makes nuclear plants have a strong interest in building a reactor to use this type of energy. For this reason, scientists from different countries have collaborated with each other on a project called Iter, which seeks to build a reactor and achieve the first reaction in 2025.
What is one example of reusing water?
taking shorter showers each day
watering the yard in the morning
watering flowers with dirty dishwater
turning off water in the sink while brushing teeth
Answer:
C-watering flowers with dirty dishwater
Explanation:
Montrel takes a trip to Central America during the winter. He finds out that the temperature in Central America is about the same year round. Which of the following could explain why?
Options:
A: Central America is near the North Pole.
B: Central America is near the South Pole.
C: Central America is near the equator.
D: Central America is near sea level.
Answer:
C
Explanation
Because My teacher told me that for an example Florida is hot but in Central America is cold or hot and you don’t need a jacket. I don’t remember much
The Central America is near the equator could explain the above statement.
What is equator?Equator is an imaginary line that passes through the centre of the globe at 0 degrees latitude and at equal distance between the North and South Poles.
Some countries of Central America are situated near the equator. The places near equator have little seasonal variation. These places have same amount of daylight and darkness throughout the year and remain warmer year round. These places near the equator have an alternating dry and rainy seasons.
Hence, we can conclude that option C is the answer.
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9 POINTS PLEASE HELP ASAP!!
determine the mass of butane that burned when 2.46g water were produced
Complete combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O
Combustion of butane (C₄H₁₀) :
[tex]\tt 2C_4H_{10}+26O_2\rightarrow 8CO_2+10H_2O[/tex]
2.46 g water(H₂O) were produced
mol of water[tex]\tt \dfrac{2.46}{18}=0.137[/tex]
mol of butane[tex]\tt \dfrac{2}{10}\times 0.137=0.0274[/tex]
mass of butaneMW : 58,12 g/mol
[tex]\tt mass=mol\times MW\\\\mass=0.0274\times 58.12\\\\mass=\boxed{\bold{1.592~g}}[/tex]
what are the stages of breast cancer and what happens in each stage?
actually anatomy & physiology
own words pls i need it now
Answer:
There are 5 stages of breast cancer: stage 0 (zero), which is non-invasive ductal carcinoma in situ (DCIS), and stages I through IV (1 through 4), which are used for invasive breast cancer. The stage provides a common way of describing the cancer, so doctors can work together to plan the best treatments.
Explanation:
In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __________.
a.Electromagnetic radiation
B.Convection
C. Solar flares
D. Conduction
Answer:
solar flares
Explanation:
We have that The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as
Solar flaresOption D
From the question we are told
In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __
Generally
When the sun give off Heat energy it does this by the rising of hot plasma and sinking of cooler plasma
This Process is defined by scientist around the world as Solar flares and this
is the reason why the rays if the sun reaches earth.
Therefore
The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as
Solar flares
Option D
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The half-life of a radioisotope
a
gets shorter with time
b
is constant
c
get shorter with increasing temperature
d
decreases by a factor of two each time
e
become longer over time
Answer:
b is constant
Explanation:
The half-life of a radioisotope is constant throughout its life cycle.
Half-life is the time taken for half of the radioactive nuclei to disintegrate.
Every radionuclide has its characteristic half-life and it is independent of the number of radioactive atoms.
The half-life does not depend on any variable. It is an inherent property of a radioactive isotope. The shorter the half-life, the faster a radionuclide decays. Nuclides with a long half life are fairly stable for a long period of time. The decay of a radioactive element is usually characterized by its half-life.Therefore, the most ideal statement about half-life is that it is constant.
What happens to the density of a substance when it is heated? Explain your answer.
Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density.
From: www.middleschoolchemistry.com
Can someone please definition of atomic radius using , nucleus, valence electrons and energy.❤️
Answer:
Explanation:
-The Atomic Radius of an element is the distance between the center of an atom
-nucleus and its outermost, or valence electrons. ... These changes are caused by the interaction between the positive charge of the protons
- nucleus and the negative charge of all the atom's electrons.
how much is 3.5 gallons in cups
Answer:
3.6 gallons are equal to 56 cups
Which characteristic influences the polarity of these molecules?
(Molecules are; CCI4, NH3, CH4, H20, CO2) P.S WILL GIVE BRAINLIEST AND 5 STARS+ THANKYOU! :)
Answer: electronegativity,
Explanation:
The maximum potential energy of a box sliding from the top of a ramp to the bottom is at the top. Potential energy is stored energy. The box has the most stored energy at the top and it decreases as it slides down the hill.A box slides from the top of a ramp to the bottom, its maximum potential energy is located
A) at the top.
B) at the bottom.
C) equal at all locations.
D) at the exact middle of the ramp.
A:The top of the Ramp
1. A student measures the height of a small lamp to be 32cm. According to the factory specifications,
the lamp is actually 30cm. What is the percent error of the student's measurement?
Answer:
6.67 %
Explanation:
Given that,
Measured height of a small lamp, l = 32 cm
Actual height, l' = 30 cm
We need to find the percent error of the student's measurement. Percent error is given by :
[tex]\%=\dfrac{|l-l'|}{l'}\times 100[/tex]
Putting all the values, we get :
[tex]\%=\dfrac{|32-30|}{30}\times 100\\\\\%=\dfrac{2}{30}\times 100\\\\\%=6.67\%[/tex]
So, the percent error of the student's measurement is 6.67 %.
How many atoms are in 0.0745 mol K?
1. 27159200000000000000000
2. 37035300000000000000000
3. 35710500000000000000000
4. 45526300000000000000000
5. 13489300000000000000000
6. 40889400000000000000000
7. 44863900000000000000000
8. 23425600000000000000000
9. 42394900000000000000000
10. 25172000000000000000000
Answer:
44863900000000000000000
Two substances each have a
temperature of 23 degrees Celsius.
After they are combined the
temperature rises to 27 degrees
Celsius. What evidence proves a
chemical reaction occurred?
List the following elements in order of increasing atomic radius:
1. sulfur II. hydrogen III. strontium IV. iodine
V. oxygen
Answer:
sulfur
hydrogen
iodine
oxygen
strontium
Explanation:
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.
In general, the size of an atom will decrease as you move from left to the right of a certain period.
Order of increasing atomic radius:
O < H < S < I < Sr
Describe the trend of atomic radius.The atomic radius measures the separation between an atom's nucleus and its farthest electrons.
The trend across a periodAtoms' atomic radii typically decrease from left to right.As electrons are added to the same primary energy level, protons are gradually added to the nucleus. Because of the increased positive charge on the nucleus, these electrons are gradually drawn closer to it. Atomic sizes shrink as the strength of attraction between nuclei and electrons grows.The trend down the groupWithin a group, atoms' atomic radii typically increase from top to bottom. Again, the positive nuclear charge rises as the atomic number decreases inside a group. The number of major energy levels that are occupied is increasing as well, though. The orbitals from higher primary energy levels have greater sizes than the orbitals from lower principal energy levels. Atomic radius increases down a group as a result of the stronger impact of the major energy levels outweighing the increase in nuclear charge.Learn more about atomic radius here:
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one of the materials delivered by blood in the body. what is it?
Answer:
sugar and oxygen and nutrients
Explanation:
Blood brings oxygen and nutrients to all the parts of the body so they can keep working. Blood carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system to be removed from the body.
the difference between a scientific theory and a scientific law?
A scientific law is the description of an observed phenomenon. The explanation of a phenomenon is called a scientific theory.
Anyone get this please help me, can you do it step by step please
Answer:
approx 17.1429 days rounded up = 18days
Explanation:
400÷70 =5.7143 × 3 = 17. or rounded up = 18days
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _________________ volume and _________________ shape. With each passing minute, _________________ is added to the substance. This causes the molecules of the substance to _________________ more rapidly which we detect by a ________________ rise in the substance. At point B, the temperature of the substance is __________°C. The solid begins to ________________. At point C, the substance is completely _______________ or in a _______________ state. Material in this phase has _________________ volume and ________________ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a __________________ to a _________________. This heat energy is called the latent heat of fusion. (An interesting fact.)
Between 9 and 13 minutes, the added energy increases the ____________________ 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 _______________ to 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
Unobtainium
40 °C
140 °C
Foosium
70 °C
140 °C
Which of these three substances was likely used in this phase change experiment?
Answer:
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _____fixed____________ volume and ______________fixed___ shape. With each passing minute, ______________heat___ is added to the substance. This causes the molecules of the substance to _____collide____________ more rapidly which we detect by a ______temperature__________ rise in the substance. At point B, the temperature of the substance is __________°C. The solid begins to ______melt__________. At point C, the substance is completely ______liquid_________ or in a _______________ state. Material in this phase has _______fixed__________ volume and ______no definite______ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a ________solid__________ to a __________liquid_______. This heat energy is called the latent heat of fusion. (An interesting fact.)
Answer:
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _____fixed____________ volume and ______________fixed___ shape. With each passing minute, ______________heat___ is added to the substance. This causes the molecules of the substance to _____collide____________ more rapidly which we detect by a ______temperature__________ rise in the substance. At point B, the temperature of the substance is __________°C. The solid begins to ______melt__________. At point C, the substance is completely ______liquid_________ or in a _______________ state. Material in this phase has _______fixed__________ volume and ______no definite______ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a ________solid__________ to a __________liquid_______. This heat energy is called the latent heat of fusion. (An interesting fact.)
Explanation:
A cubic object has a volume of 250 cm. What is its density if its mass is 5 points
257.3 g?
Answer:
The answer is 1.03 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 257.3 g
volume = 250 cm³
We have
[tex]density = \frac{257.3}{250} \\ = 1.0292[/tex]
We have the final answer as
1.03 g/cm³Hope this helps you
An example of a solution is vinegar because it has 5% acid and 95% water True orFalse
Answer:
The answer is true!
Explanation:
How can you relieve stress?
Plz help, have a quiz on this plz PLZ
Answer:
20.82
Explanation:
You need to determine the
volume piece of chalk using water
displacement. The graduated cylinder
filled with water measures 8.7 mL
before the chalk is added. After the
chalk is added the water level rises
and now reads 12.4 mL. Determine the
volume of the piece of chalk in mL.
Answer:
3.7 mL
Explanation:
Step 1: Given data
Volume of water before the chalk is added: 8.7 mL
Volume of water after the chalk is added: 12.4 mL
Volume of the chalk: ?
Step 2: Calculate the volume of the chalk
The volume of the chalk is equal to the volume of water after the chalk is added minus the volume of water before the chalk is added.
V = 12.4 mL - 8.7 mL = 3.7 mL
Describe how the organelles in a cell work together to keep an organism alive
Answer:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Explanation:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Which one is it First to answer (correct) gets brainlist
Answer:
D
Explanation:
A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. ... While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented
titsssss is the answerr mateeee
plss
tell
the
ans
.............
Answer:
b option will be the answer because in b option the light rays are coming in the eyes and you will be able to see the thing written on the sheet of paper
i hope you got it if yes please mark it as brainliest
what's the answer plz help
Answer:
C.. one enegry level..