Answers
Therefore, mass no. of sodium = 11 + 12 = 23
2. Total no. of electrons in a neutral sodium atom (has not reacted with anything, thus has not lost any electrons, thus is neutral) = Atomic no. = electron no. = 11
3. So as mass no. of magnesium is 24, and mass no. = protons+neutrons, and no. of protons is 12, then no. of neutrons= atomic no. - protons = 24-12= 12
4. Atomic no. = no. Of electrons= 13
5. Mass no. = protons+neutrons= 31
No. Of neutrons=16
Therefore, no. Of protons= Mass no. - neutrons= 31-16=15
Also- no. Of protons=no. Of electrons= 15 (another way to solve)
Related Questions
I need help with this too. (im not good at science or math)
Answers
Answer:
i belive 1 m/s
Explanation:
dividing displacement from time it should be 1 cuz 5/5 is 1
please tell me if right!
If you put food coloring in room temperature water, the coloring spreads throughout the water.
The water causes the color to spread mainly because:
•the food coloring is heavy
•food coloring molecules are small
•the water is warm
•the water molecules are in motion
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Answer: Water molecules are in motion
Summarize what you learned this week about the electromagnetic spectrum
HINT: What is it? What does it organize? How do we use these EM waves in our lives?
Answers
Answer:
I only really know the "How do we use these EM waves in our lives?" part srry
Explanation:
EM waves are used to make sure you cellphone, radio, TV, and etc. have service/ connection.
Radio waves
Microwaves
Infrared
Visible light
Ultraviolet
X-ray
Gamma ray
We use these everyday in our life however they also have dangers.
Radio waves - their long wavelength allows them to help with communication
Danger - exposure to a lot of radio waves can cause cancer or leukaemia
Microwaves - used for heating up food and transferring heat to the food.
Dangers - exposure can cause cancers and other diseases.
Infrared - can be used for remote controls and security cameras.
Danger - can cause damage to the cornea in your eye
Visible light - used for photography and optical fibres.
Danger - intense sources can cause permanent or temporary damage to the eyesight.
Ultraviolet - can be used to sterilise food and sterilise surgical equipment.
Danger - can cause skin damage and may lead to a cancer.
X-rays - used to see the internal structure of tissues and bones.
Dangers - can lead to mutations and May damage the cells
Gamma- can be used to sterilise food and surgical equipment and kill microorganisms and other bacteria.
Dangers - May reach your cells and cause cancer and cell mutations which could result in mutations.
occurs when a wave moves from one medium to another medium with diffrent properties. What is the word to this definition?
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Is this true of false
Apples and Onions taste the same if you plug your nose?
Answers
How do you think the weather and climate might change in the area around Mt. Everest?
Answers
Answer:
It does change if the weather is bad then very soon the climate will turn bad when the climate is unfavourable then the sourrounding will be affected. For example if the area around the Mt. Everest is Hot & Humind the ice would start melting & it would lead to way more issues.
Claim 2: Firing the thrusters only slowed the pod, it didn’t stop; the pod hit the space station, which made it bounce and move in the opposite direction. This would happen if.
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The force exerted by the thrusters caused the pod to change direction. It depends on the direction and the strength of the force exerted.
12 POINTS PLUS MARKF BRAINILEST
Answers
Answer:
gas
Explanation:
can u plzz help meee
Answers
h: sB and Sb
hd : sb
hr : SB
Hd:sb
Hr:sb
examples of positive effects of fluid forces
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Answer:
fluid dynamic forcesln physics fluid mechanicsPleAsE aNSwEr ,____,
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Answer:Both types involve multiple atoms coming together to form a more complex structure.Both types of bonding result in atoms becoming more stable in the group than they were individually. Both types of bonding are exothermic as the potential energy of the participants is lowered as they form the bond. Ionic bonding occurs between atoms that have opposite needs for electrons (metals and nonmetals) and results in a transfer of electrons. Covalent bonding occurs between atoms that have similar needs for electrons (two nonmetals) and results in a sharing of electrons.
By transferring electrons, ionic bonding leads to the formation of charged particles that have either an excess of protons (cation) due to the loss of electrons or an excess of electrons (anion) due to the gain of electrons. Covalent compounds contain neutral atoms.The electrostatic attraction that occurs in ionic bonding is between cations and anions. The electrostatic attraction in covalent bonding arises from a shared electron’s attraction for its original nucleus as well as the nucleus of the sharing atom.
Ions bond in a pattern that maximizes attractions between oppositely charged ions and minimizes repulsions between like charged ions. The geometric pattern that arises is called the crystal lattice and is consistent throughout the crystal. All ions are held by a network of ionic bonds which are considered strong intramolecular forces. Atoms in a covalent compound are held together by covalent bonds which are also considered strong intramolecular forces. In the solid, crystalline state, both types lead to regular, ordered patterns and structures.
Both types of compounds can undergo changes in physical state under the right conditions of temperature and pressure.
Both types of compounds have a net neutral charge.
Both types of compounds contain a fixed ratio of participants that is represented by the subscripts in their chemical formulas (they do not require a 1:1 ratio).
Explanation:This was the exact assignment I had I got a 96%
The sleigh is being pulled with a force of 800N and has a mass of 200 Kg.
What is the acceleration in m/s/s?
Answers
Answer:
a = 4m/s²
Explanation:
Given:
F = 800N
m = 200 kg
Unknown:
acceleration or a
Formula and solution:
a = F/m
a = 800 kg.m/s² ÷ 200 kg
Final Answer:
a = 4 m/s²
in the solution there's a two same unit and that is kg so the same unit will be cancelled and the rest is going to aapply in the answer that is 4 so if combine it the final answer is 4 m/s²
What question can you ask yourself if you are trying to determine if a mixture is heterogeneous or homogeneous? (This is not in the reading, so you will have to come up with your own question to tell the difference.)
Answers
Answer:
did it have more than one phase
Explanation:
this will be my question
If a horse is running at a speed of 35 m/s when it's rider pulls up on the reigns. After 5 seconds the horse slows down to a pace of 15 m/s. What is the horse's rate of acceleration?
Answers
The acceleration of the horse's speed which is running at a speed of 35 m/s when it's rider pulls up on the reigns will be -4 m/s².
What is Acceleration?Acceleration can be defined as the rate of change of velocity with respect to time. Acceleration is a vector quantity as it has both the magnitude and direction. The SI unit of acceleration is m/s² or ms⁻².
The expression for acceleration will be:
a = (v-u)/ t
v = 15m/s,
u = 35m/s,
t = 5 sec,
a = (15-35)/ 5
a = -20/ 5
a = -4 m/s²
Therefore, there will a negative acceleration of 4 meters per second square.
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Energy Transfer and Temperature Quick Check
4 of 4Items
Item 4
Use the table to answer the question.
Sample Temperature (ºC)
L 40
M 88
N 21
The table shows the temperature of three water samples. Which list shows the samples in order from greatest to least average kinetic energy of the water molecules?
(1 point)
L, M, N
N, L, M
M, L, N
N, M, L
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Amy weighs 35 kg and her dad weighs 85 kg. They are roller skating. Amy challenges her dad to race. They stand poised at the starting line. Her dad yells, “Go!” Who will go faster and why?
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Answer:
Amy because she was less than her dad and due to the dads weight being more it'll add friction to the skates which will slow him down.
Explanation:
Answer:
Amy will win because she ways less than her dad.
Explanation:
Pls Help, This is Physical science, and it involves math, and funny thing math is my weakspot, so pls help me, the pic is down below
Answers
Answer: For forces on flat rigid bodies such as a wall, it is less direct in the calculation of work done as force times distance or displacement compared to other situations. You will have to calculate the pressure exerted first which will be P = F/A, where F is the force as above in Newtons, and A is the area of the wall first. There should also be a pressure limit for the wall in question based on what it is composed of and its dimensions from structural mechanics. The exerted force must exceed the upper limit of tolerated force to break the wall. In any case even without breaking the wall, using very accurate optical technology you can estimate the displacement now a days however minute, or the change in the form of volume of displacement also due to the pressure. Here Work done can be given still as follows : W = F •d, or W = P •V, or W = (F/A)•V. Here V will be the approximate
Explanation: i hope this helps
PLS HURRY! `WILL GIVE BRAINLIEST TO FIRST ANSWER
Which factor can decrease the kinetic energy of an object? (3 points)
Increase in speed
Decrease in speed
Increase in temperature
Decrease in volume
Answers
Answer:
Decrease in speed
Explanation:
Increasing an object's velocity can decrease kinetic energy. *The velocity of an object has no effect on kinetic energy. *Increasing an object's velocity can increase kinetic energy. Increasing an object's velocity can increase kinetic energy.
HELP NEEDED
What would be an example of something being brittle? *
a fishing pole
a bowling ball
a cupcake
an airplane
Answers
Answer:
Explanation:
A fishing pole maybe?
Answer:
A aieplane
Explanation:
Because brittle means hard but liable to break or shatter easily.
PLS HELP! I WILL GIVE BRAINLIEST TO FIRST ANSWER
The distance versus time graph for Object A and Object B are shown. (3 points)
Which statement best describes the motion of Object A and Object B?
Both objects move with variable speed.
Both objects move with constant speed.
Object A moves with constant speed and Object B moves with variable speed.
Object A moves with variable speed and Object B moves with constant speed.
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Answer:
Explanation:
Object A moves with variable speed and Object B moves with constant speed.
X-Rays can reveal an objects temperature since temperature determines the wavelength of its radiation. The ________ the object, the _________ the wavelength is.
PLEASE HELP!
Answers
Answer: I think the answer is "hotter" the "bigger"
Explanation:
X-Rays can reveal an objects temperature since temperature determines the wavelength of its radiation. The HOTTER the object, the BIGGER the wavelength is because if tempeture determines wavelength then the hotter it is the bigger the wavelength would be and vice versa. Hopefully that helped. im not 100% sure.
What purpose would the sand serve?
FIRST ONE TO ANSWER CORRECTLY GETS BRAINLIEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
Answer:
Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass.
Explanation:
Interesting fact...
Why are there differences between the cooling rates of sand and water? Sand cools off faster than water because sand is a solid. Water heats up slower and cools off slower than sand. Sand heats up faster and cools off faster than water.
As a variable and to count as land. As if you were at a beach, this sand would count as the sand that the sun would be beaming on. ^^
-Answer
PLEASE. A 20 kg box is being pulled across a floor by a horizontal rope. The tension in the rope is 99 Newtons. The coefficient of friction is 0.25. What is the force of friction on the box? What is the acceleration of the box?
Answers
Answer:
Force of Friction = -50 (N)
Acceleration = 2.45 (m/s^2)
Explanation:
Force of Friction = f = N * coefficient of friction
N = m * g
=> Force of Friction = m * g * coefficient of friction
f = 20 * 10 * -0.25 = -50 (N)
------------------------------------------------------
(1) F net = F + f
(2) F = m * a
(1) F net = 99 - 50 = 49
(2) a = 49 / 20 = 2.45 (m/s^2)
write a motivational speech to someone who wants to become a scientist please write this as it is for kids :) PLEASEE HELP!!!!
Answers
Answer:
A motivational speech for a to be scientist. Crazy experiments and more you have the right to be whatever you adore. Your young yet strong everything will come along. I believe in you and so should you since your becoming a scientist you’ll acquire it soon. You’ll discover new things and sight to see when you become a scientist make sure to call me. :)
Explanation:
Hope it’s good I made up a couple words that rhyme good luck!
the spreading out of waves after passing through a small opening. What is the word to this definition? HELP!!
Answers
Answer:diffraction
Explanation:
Answer:
Refelction
Explanation:
look it up that is what it says
5.0 start thanks and plx do brainly
What does potential energy depend on?
Answers
Q: What does potential energy depend on?
A: Pontential energy depends on the mass of an object and it's distance.
find the answer and ty =
1322/243+2-365
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it’s negative ^^
Which is a valid velocity reading for an object?
A.45 m/s
B. 45 m/s north
C. 0 m/s south
D. 0 m/s
Answers
The valid option would be 45 m/s north. This option specifies a velocity of 45 meters per second in the north direction. It includes both the magnitude (45 m/s) and the direction (north) of the velocity. Hence the correct option is (A).
A. 45 m/s: This indicates a velocity of 45 meters per second without specifying the direction. It represents the magnitude of the velocity but does not indicate a particular direction.
B. 45 m/s north: This indicates a velocity of 45 meters per second in the north direction. It specifies both the magnitude (45 m/s) and the direction (north).
C. 0 m/s south: This indicates a velocity of 0 meters per second in the south direction. No velocity. It specifies both the magnitude (0 m/s) and the direction (south).
D. 0 m/s: This indicates a velocity of 0 meters per second, meaning the object is not moving. It represents zero speed and zero direction.
The correct option is (A).
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What forces hold the planets and the moon together?
Answers
Answer:
Gravity
Explanation:
Because there this is lot of mass there is a force pulling mass to it, that is gravity.
The Sun's gravity pulls the planets in orbit around it, and some planets pull moons in orbit around them. Even spacecraft are in motion through the solar system, either in orbit around the Earth or Moon, or traveling to further worlds, because of gravitational forces.
Match the parts of an atom to the colors in this picture:
Protons
Electrons
Neutrons
Answers
Red - Protons
Green - Neutrons
Answer:
The yellow circles are electrons.
The green circles neutrons
The red circles are protons.