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
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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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.
Is this true of false
Apples and Onions taste the same if you plug your nose?
Answers
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.
Answers
The force exerted by the thrusters caused the pod to change direction. It depends on the direction and the strength of the force exerted.
Which boxes represent pure substances?
Answer Choices
A and D
A, B and D
All of these
D only
Answers
Can someone tell me the answer to this?
Answers
Answer:
A
Explanation:
Answer:
A
Explanation:
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.
Answers
Answer:
Explanation:
Object A moves with variable speed and Object B moves with constant speed.
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)
The equation shows a chemical reaction using 64 grams of calcium, 162 grams of zinc carbonate, and 152 grams of calcium carbonate.
calcium + zinc carbonate → calcium carbonate + zinc
According to the law of conservation of matter, how much zinc is present in the product?
Group of answer choices
74 grams
98 grams
88 grams
64 grams
Answers
162-152=10
64+10=74
So 74 grams is the answer
1 The drop of food coloring spreads slowly.
2 The drop of food coloring spreads very quickly.
A student places a drop of food coloring into two water samples. Her observations are shown in the table. Which statement best explains the observations in the table?
(1 point)
The water molecules of sample 1 are transferring more kinetic energy.
The water molecules of sample 1 are moving faster.
The temperature of sample 2 is close to freezing.
The temperature of sample 2 is higher.
Answers
Answer: The water Molecules of sample 1 are moving faster
Explanation:
The temperature of the sample in which the color spreads quickly is higher than sample 1. Hence, statement d is correct.
What is kinetic energy?Kinetic energy of a substance is the energy generated by virtue of its motion. It is dependent on the mass and velocity of the substance. Temperature of the system also affects the kinetic energy of substance.
According to kinetic theory of matter, as thermal energy increases, kinetic energy of the particles also increases leading to more effective collisions results in reactions.
Here, the color spreads more easily in sample 2 because the higher temperature of the solution provide enough thermal energy for the liquid particles to gain kinetic energy to easily move through the solution. Thus, statement d is correct.
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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.
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
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
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?
Answers
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:
Examples of positive effects of fluid forces
note: and pls I don't want the definition
Answers
Answer:
slider,topspin,hook,curveballs
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.
PLEASE HELP!! IM TIMED!! WILL MARK BRAINLIEST!! 13 POINTS!! SCIENCE!!
What best explains the source of light energy and heat energy produced by a star?
A. Dense metals, such as iron, explode in the core of a star.
B. Explosions from a nearby supernova provide fuel to the star.
C. Nuclear reactions involving the fusion of atoms occur in the core of a star.
D. High-energy radiation from nearby stars penetrate the core of a star.
Answers
Answer:
C
Explanation:
What are the 4 things you can do to change the strength of an electromagnet.
Answers
Answer:
1. wrapping the coil around a piece of iron (such as an iron nail)
2. adding more turns to the coil.
3. increasing the current flowing through the coil.
4. turn it off
Explanation: I really hope it helps
12 POINTS PLUS MARKF BRAINILEST
Answers
Answer:
gas
Explanation:
What is true about the force acting on the cars at the end of a roller coaster ride as they slow down right before stopping?
Answers
The cars will slow down as a result of unbalanced forces and negative acceleration.
What is Inertia?Inertia is the ability of an object to continue its current motion until and unless some external force causes its speed or direction to change. Inertia is described in the Newton's first law of Motion.
The cars are slowed due to negative acceleration of the object eventually to a stop, because of these unbalanced forces due to friction which are acting on them. The riders, which have inertia, are also acted on by the unbalanced forces throughout the ride causing them to change their state of motion.
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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.
HELP FAST ONLY CORRECT ANSWERS 15 PT
Research the Moon to understand why only one side of the Moon is observable from Earth. If this was the case with the Earth-Sun system, what would be Earth’s period of rotation?
Answers
Answer:
We only see one side of the moon due to the synchronous rotations and the earth rotation ration is approximately 27 days
Explanation:
can u plzz help meee
Answers
h: sB and Sb
hd : sb
hr : SB
Hd:sb
Hr:sb
Describe the units used to measure mass and volume.
Answers
Answer:
Mass measures the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg). Volume measures the amount of space that a substance or an object takes up. The basic SI unit for volume is the cubic meter (m3)
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:
friction = 49 N, a = 2.5 m/s/s
Explanation:
big brain
A force of 1000 pounds drags a truck 50 feet in 10 seconds.
How much work is accomplished?
How much power was required?
Work = 50, 000 ft-lbs, Power = 5000 ft-lbs/sec
Work = 50,000 ft-lbs, Power = 500 ft-lbs/sec
Work = 5,000 ft-lbs, Power = 500 ft-lbs/sec
Answers
Answer:
The first one (Work = 160,000 Nm, Power = 160, 000 Nm/sec)
Explanation:
hope this helps :)
A force of 1000 pounds drags a truck 50 feet in 10 seconds. then the work accomplished is 50000 lbs feet and the power required was 5000ft-lbs/sec.
What is Force ?Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force. Balanced forces are those forces which are opposite in direction and equal in magnitude. When Net force acting on a body is zero then we call it as balanced force. Balanced force is not responsible for the motion of the body. ex. when two persons pulling rope on both end with equal magnitude which cause them to be balanced force have 0 net force. Unbalanced forces are those when resultant of all the forces is not equal to zero is called as unbalanced force. unbalanced force is responsible for the motion of the body.
Given,
F = 1000 pound
s = 50 feet
t = 10 s
Work = F.s = 1000 * 50 = 50000 lbs feet
Power = Work/time = 50000/10 = 5000ft-lbs/sec
Hence option A is correct.
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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.
PLEASE HELP IM TIMED!! THIS IS SCIENCE!! WILL MARK BRAINLIEST 13 POINTS
Which statement best explains how galaxies are held together?
A. Thermal energy generated by stars holds galaxies together
B. Magnetic forces among the components of galaxies holds galaxies together
C. Electrical energy generated by planets holds galaxies together
D. Gravitational forces among stars and other components of galaxies holds galaxies together
Answers
Answer:
D
Explanation:
Gravity pulls objects together
Explanation: Gravity holds things in place. Therefore the answer is gravity. Also, without gravity there would be nothing to hold planets in place which would make it to where there are no galaxies.
Hope this helps!:)
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
Answers
In the word "hydroelectricity," which of the following does the prefix "hydro-" relate to? Choose the best answer.
Answers
We didn't get any answer options but here's my answer anyways...
Hydro power is electrical energy produced through the power of moving water. Power obtained from the (typically gravitational) movement of water., Hydropower plants derive energy from the force of moving water and harness this energy for useful purposes...
Hope is helped!