Answer:
What is this please send questions properlythen i will answer it properly
In class we made salt crystals. To do this we put a supersaturated solution of salt into a glass of water. After a few days the water evaporated and the salt crystals were left on the paper cutouts. When the salt dissolved in the water was this a physical change or a chemical reaction? Please explain your answer in detail.
Answer:
Dissolving a solid in liquid, such as table salt in water, is a physical change.
Explanation: Its a physical change because only the state of the matter has changed
How does gravity act on an object?
1. exerts force upward on an object
2. repels objects
3. pulls objects towards the Earth
4. restores an object to its original position
Need answer asap!! First one to answer will get a brainliest!!
Answer:
3 can i have brainliest?
Explanation:
A submarine fills a special storage area known as ballast with water in order to increase its density. This allows it to dive deeper into the ocean. When a submarine needs to rise rapidly, compressed air is used to push the water out of the ballast. What effect does replacing the water in the ballast with air have on the submarine?
Answer:
The submarine will rise.
Explanation:
To get a submarine to surface, the main vents in the top of the tank are closed and high-pressure compressed air is blown into the ballast tanks, forcing the water out through the flood ports at the bottom of the tank. This increases the vessel's displacement.
Happy Hollidays!! :)
PLS HELP DUE SOON(Ignore that wet thingy on my paper it’s my matcha latte it go on it lol)
Answer:
well for
1. Because cytoplasm is made of a jelly like consistent
and
2. wastes product are transported by endoplasmic reticulum ,from organelles to outside cell ,so if cell size is big ,it will take more time in transportation and vice versa
Answer: Hello
Explanation: Hello
6 CO₂ + 6 H₂0 → C₆H₁₂O₆ + 6 O₂
A. 6 CO₂
B. →
C. 6 H₂0
B. C₆H₁₂O₆
What are the evidences for suspecting the presence of waves?
Answer:
Well,
Conducting rods are good for detecting oscillating electric fields and conducting loops are good for detecting the presence of radio waves.
What causes the seasonal changes viewed in the night sky?
Answer:
If you look at the night sky different
times of the year you see different
constellation.This change due to the
motion of the earth in it's orbit around
the sun.The shift of the sky is really
the motion of the earth around the sun.
Explanation:
Hope it helps
Explanation:
the factors which bring about the chemical reaction
Help!!!!! 30 points!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer: Hubble's brilliant observation was that the red shift of galaxies was directly proportional to the distance of the galaxy from earth
Explanation:
Slow cooling of hot magma leads to the formation of ___________ crystals
Answer:
Slow cooling leads to the formation of large crystals. If the crystals remain undisturbed while cooling, they grow according to a regular pattern. Magma closer to the surface cools much faster than magma that hardens deep below ground. With rapid cooling, there is no time for magma to form large crystals.
Explanation:
Hope it's help
Answer:
large
Explanation:
Please help me with this
I HAVE A D- IN SCIENCE PLEASE HELP
Complete the sentence.
In chemical reactions, a product is _________.
A. any substance that is to the left of the arrow
B. any substance that is made of the greatest number of atoms
C. any substance that is made from the least number of atoms
D. any substance to the right of the arrow
Answer:
D - Any substance to the right of the arrow.
Explanation:
A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Iodine-138 decays by beta decay. What element does it produce?
[tex] {xe}^{138} [/tex]
Explanation:
the bottom number would be 54. This is because you add one to 53 to make it 54 and you add 0 to 138.
A submarine fills a special storage area known as a ballast with water in order to increase its density. This allows it to dive deeper in the ocean. When a submarine needs to rise rapidly, compressed air is used to push the water out of the ballast. What effect does replacing the water in the ballast with air have on the submarine?
Answer:
the submarine floats after replacing the water with the compressed air
Answer:
The submarine will rise.
Explanation:
To get a submarine to surface, the main vents in the top of the tank are closed and high-pressure compressed air is blown into the ballast tanks, forcing the water out through the flood ports at the bottom of the tank. This increases the vessel's displacement.
In a chemical reaction, the mass of the reactants is 13.3 grams. Which of the following could represent the mass of the products?
A. 26.6 grams.
B. 13.3 grams.
C. 39.9 grams.
D. 3.3 grams.
Answer:
Hi the answer should be 13.3
Explanation:
Hope this helps! :D
What is inertia?
1 . the tendency of an object to stay at rest or in motion
2. the energy of an object because of its position
3. a force that pulls objects toward each other
4. a force that slows an object down
Answer:
A. The tendency of an object to stay at rest or in motion.
Explanation:
Interna makes stuff stay on motion or in place.
Answer:
the tendency of an object to stay at rest or on motion
Plz help! Please write your answer in complete sentences and write a proper answer!
FIrst on to answer will get a brainliest!!! Thx!
Answer:
When launching a rocket in space, the rocket's fuel starts burning and is pushed downward in the form of a gas. Due to which an external force is generated on the rocket in an upward direction which is a reaction of the force of burning fuel gas.
Explain the green house effect (make sure that you explain the role of the Nitrogen and Carbon cycle)
Answer:
Nitrogen emissions such as ammonia, nitrogen oxide and nitrous oxides contribute to particulate matter and acid rain. Nitrous oxide is a particularly potent greenhouse gas as it is over 300 times more effective at trapping heat in the atmosphere than carbon dioxide.
Explanation:
Martin slowly pours an unknown liquid into a container that originally had some water in it. He is measuring the temperature in the container as he does this.
The temperature in the container rises very fast.
What kind of change is likely to be happening in the container?
A. A physical change.
B. A chemical change.
C. Neither a chemical nor a physical change, only a temperature change.
D. No evidence of any type of change.
HELP ME PLEASE!!! ASAP
it's c I believe
Explanation:
I believe
Answer: chromium and carbon monoxide
Explanation:
Mixing baking soda and vinegar is an example of an endothermic reaction. This means...
A. baking soda and vinegar are products in this reaction.
B. energy is taken in during the chemical reaction.
C. energy is released during the chemical reaction.
D. there is no change in energy during the chemical reaction.
Answer: think a
Explanation:
How does the law of conservation of mass apply to this reaction: Mg + HCl → H2 + MgCl2?
A.) Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side
B.) The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.
C.) Only the hydrogen needs to be balanced. There are equal numbers of magnesium and chlorine.
D.) The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
Answer: The correct answer is A. Hydrogen and chlorine need to be balanced. There's an equal amount of magnesium on each side.
Is gravity alone sufficient to explain the behavior of the tinsel in the Levitating-orb system? Explain why.
Answer:
The object is moving forward
Explanation:
Hop this helps :)
speed =________
ate divided by time
rate divided by distance
distance divided by time
time divided by rate
I need answer asap! Plz someone help ! Ill give brainliest!
Answer:
Distance divided by time is the answer. :)
Explanation:
PLS HELP (science)
Match the following molecules with the number of atoms they contain.
1. 2Fe
seven
2. 2Al 3O 2
eight
3. 4O 2
two
4. 5C
five
5. H 2SO 4
ten
Answer:
hello I will answer ur question if u answer mine
Explanation:
This is the chemical formula of Nitrogen gas.
N₂
Which of the following is NOT true of nitrogen gas?
A. It is made of two atoms.
B. It is a molecule.
C. It is an element.
D. It is a compound.
Answer:
D
Explanation:
N₂ is not a compound because it is not made up of two or more different elements - it is only made up of nitrogen atoms
Hope this helps!
What type of fossil forms when the impression from the remains of an organism is filled in with soil and hardens into the shape of the original organism?
Answer:
i belive its a "Mold fossil"
Explanation:
Based off of the simulation pulley gizmo; how many people did it take to lift the armchair with a fixed pulley? (Look at Activity A question 2)
Question 5 options:
1
3
4
5
Answer:
IN WHICH GRADE YOU ARE????
What will a soccer player need to do to change a ball’s position?
1. He must apply gravity to the ball so that the ball will move.
2. He must weigh the ball to determine the motion that needs to occur.
3. He must set the ball in motion by applying a force in the desired direction.
4. He must identify the location of the ball.
First one to answer will get brainliest!
Answer:
He must set the ball in motion by applying force in the desired direction.
Explanation:
That is how the soccer player will change the ball's position.
Have a good day :)
Answer:
4. He must identify the location of the ball.
Explanation:
If a soccer player needs to change his position, then he will need to identify the location of the ball.
hope this helped.
glacial striations in the bedrock of south africa indicate that glaciers once moved across the african continent the presence of glaciers on the surface of africa is evidence that
The presence of glaciers on the surface of Africa is evidence that it moved outwards from a central point in southern Africa.
What is a Glacier?This is defined as the persistent body of dense ice that is constantly moving under its own weight.
Glaciers being found on African surface depicts that the movement occurred outward from Southern Africa during the period.
Read more about Glaciers here https://brainly.com/question/6666513
You have been given the task of designing a heat pack to relieve soreness in muscles by combining oxygen and iron. The more oxygen that is added to iron, the more it will heat up. Which of the following temperature changes would you be looking for?
A.There will not be a reaction
B.An increase in temperature, showing an endothermic reaction
C.You should not expect a temperature change because this is a physical reaction
D.An increase in temperature, showing an exothermic reaction
Answer:
an increase in temperature showing an endothermic reaction
Explanation:
the atmospheric oxygen is supplied to the iron .An endothermic reaction is any chemical reaction that absorbs heat from its environment.