Plz, help! I need help with questions a and b! Plz, write your answer in complete sentences! And the first person to answer will get a brainliest! Plz, NO SCAM links!!! Need help ASAP!!!!!

why does atumn start in diffrent months of the year in north america and south america

Hydrogen and oxygen undergo a chemical reaction to form water. How much water will be created if hydrogen has a mass of 3.56 g and the oxygen has a mass of 25.32 g?

A food scientist is determined to create a mango that looks exactly like a mango but tastes like salmon. Can this be achieved through artificial selection? Why or why not?

Please help!!! Hydrogen and oxygen undergo a chemical reaction to form water. How much water will be created if hydrogen has a mass of 3.56 g and the oxygen has a mass of 25.32 g?

Actual answers only please :)

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

You push on an object with an applied force. What is the "reaction" force to your push?
1. the object moving forward
2. the object being pulled by Earth
3. the object pushing back on you
4. the object being lifted up

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.

Name the 5 characteristics needed for a substance to be a mineral

How do wetlands form?

- tributaries flow into rivers.
• Runoff travels down the side of a divide.
ɷ Water builds up in a depression left by an ice sheet.
• Groundwater comes to the surface and floods the land.

take your time :) !

A food scientist is determined to create a mango that looks exactly like a mango but tastes like salmon. Can this be achieved through artificial selection? Why or why not?

HELPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!! 30 POINTS!!!!!!!!!!!!!!

What type of force is known for exerting an upward force on objects in a fluid?
1. buoyant force
2. friction force
3. gravitational force
4. magnetic force
The First person to answer will get the brainliest!!!!!!

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!

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.

can someone solve this question please​

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.

PLEASE HELP
Sheila and Jerome are lab partners. They have the following materials at their table:

1 square of aluminum foil, 1 stirring rod, 1 beaker of water, 1 scoop of copper II chloride salt (blue color)


Step 1:Jerome adds all the salt to the water and stirs. The salt crystals disappears and the liquid solution turns a clear blue.

Step 2: Sheila tears up the aluminum foil into small pieces.

Step 3: Jerome dares her to put the foil in his beaker. They see the edges of the foil turn a rusty orange. As they stir, the beaker becomes warm to the touch and a vapor begins to rise from the surface of the beaker. Within a few minutes, the foil has disappeared and the liquid is now clear. There are orange-rust colored flakes floating in the liquid.


Q: Jerome claims that when the salt was added to the water it turned blue and the foil disappeared, these were chemical changes. He went on to explain that the chemical change was due to the fact that the atoms were speeding up. Sheila disagrees claiming that 1 is a physical change and 1 is a chemical change and Jerome’s evidence is incorrect. Who is correct, Jerome or Sheila? Write a scientific explanation (CER) to support your argument.

Oxygen in the air can react with wood when a match is burned. Ash is produced.

Which statement would be true?

A. The atoms of the ash did not exist before.

B. Ash has similar properties to oxygen.

C. The atoms of wood and oxygen disappear during the burning.

D. Ash is a different substance than wood.

help me pls
words from the video:

What do fireworks, a fried egg, and a rusting vehicle have in common? They all involve chemical reactions. If two or more elements or chemical compounds come into contact with one another and there is enough energy present, a chemical change may take place.

When a substance undergoes a chemical change, the chemical structure of that substance is altered. A chemical change can also be called a chemical reaction. During a chemical reaction a new substance is formed.

Observe the chemical reaction between bromine and aluminum. Pieces of aluminum are cut from a strip of foil and added to liquid bromine. At first there is no reaction because of the protective oxide coating on the aluminum. But soon an exothermic reaction between bromine and aluminum causes brown fumes of bromine to be given off. But as a new substance, aluminum bromide is produced. White smoke is produced.

The resulting residue is also aluminum bromide. When two compounds or molecules react together to form new substances, they are called reactants. They new substances created plus any resulting ash, water vapor, or carbon dioxide are called products, because they are produced by the reaction.

Some chemical reactions, such as the explosion of fireworks, can happen very fast—in less than a second.

Others, like the rusting of a car, might take years. It is important to carefully examine chemical reactions because there are many ways substances can be changed without a chemical reaction taking place.

Changes of state, for example, from a solid to a liquid or from a liquid to a gas, always involve a physical change rather than a chemical one. Melting sulfur is a good example. When solid sulfur is heated to 120 degrees Celsius it melts and first forms a pale yellow liquid.

In this form the atoms are covalently bonded and the liquid can flow easily. However, heated up beyond 150 degrees Celsius, the result is a dark red liquid that is over 2,000 times stickier. The sulfur may have changed physically but it's still sulfur.

No chemical reaction has taken place. Most of the time changes of state can be reversed by either adding or taking away heat. When water is boiled, for example, water vapor molecules are released in the process.

If you captured all the vapor molecules in a container they would reform again as water droplets once the vapor cooled. When a chemical change occurs it is more difficult to revert the substance back to its original state.

Plz, Help! Read the instructions and answer the question! First one to answer will get brainliest!

I need help with this please

Iodine-138 decays by beta decay. What element does it produce?

What causes the seasonal changes viewed in the night sky?

PLS HELP DUE SOON(Ignore that wet thingy on my paper it’s my matcha latte it go on it lol)

Place the events in the order that they must occur for a fossil to be formed in sedimentary rock.

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

Helena uses the same force to move an object that has a mass of 12 kg and an object that has a mass of 5 kg. She predicts the 12 kg object will have a greater change in motion. Is she correct?

No, the object with the smaller mass will have a greater change in motion.
No, both of the objects will have an equal change in motion.
Yes, the object with the larger mass will have a greater change in motion.
No, neither object will have a change in motion.

Which phrase describes a feature of groundwater?

-feeds rivers
--provides habitats
-makes up 75% of fresh water
--used for hydroelectric power

An object has a mass of 960 g and a volume of 15cm3 what’s the density?

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!