Why would a laptop, a car, a cellphone, and a watch all contain chemical energy?

Answer:

Maybe its because they need some sort of energy to work, a car is quite straight forawrd but im not sure about a watch :/

What is an ellipse please help)

Match the term to its definition (Lessons 6.03, 6.04 and 6.05)
(i can't fit this all without confusion)

In your words, explain why water is higher salinity is denser than water with a lower salinity?

In self heating cans, the chemicals in two compartments react with each other and forms……..

1. the rate of change in an object's position over time is called what
2. the type of energy that is the sum of kinetic and potential energy at any given time is what
3. A push Or pull that can change the motion of an object (examples: magnetic force, frictional force. Please Help me this is due tomorrow

In the 1700s, Isaac Newton determined that the force of gravity between two objects depends on the mass of the objects and distance between them. He reasoned that things fall toward Earth because it has so much mass. Then in the 1900s, Albert Einstein worked with new discoveries, such as the fact that light always travels the same speed, and he determined a new explanation of how and why gravity works. Mass and distance still matter in Einstein’s explanation, but speed also matters. Newton’s explanation still works for objects close to Earth, but Einstein’s explanation works for all of the objects in the universe.

As scientists have learned more about atoms, models of atoms have changed. One of the first atomic models was a solid ball, such as a marble. What are two limitations of using a marble to model an atomic?
A. The model does not move or behave like a real atom.
B. The model is not made of commonly available materials or objects.
C. The model is much harder to see than a real atom.
D. The model does not show the true size of an atom.

Which of the following is a chemical change?
A. boiling of water
B. melting a cube of ice
C. mixing water and oil
D. splitting water into hydrogen and oxygen

Figure A and Figure B are built with unit cubes of the same size. Explain how to use the volume of Figure A to find the volume of Figure B.

ig this is chemistry but pls help i took a test and think i failed it so im doing more work to have my grade higher just in case i failed it

What are fossil fuels made from?

a. non-organic material
b. radioactive material
c. harmful poisons
d. organic material

In 3-5 sentences, explain the role of the digestive system in animals, as well as how the system works.

(science but there wasnt a science option) HELP!!!! PLEASEEEEEEEE

Max and Jimmy want to jump on a trampoline. Max begins jumping in a steady pattern, making small waves in the trampoline. Jimmy starts jumping on the trampoline too. Suddenly, Max goes twice as high even though he did not put any extra effort into jumping.

What type of wave interaction is this? Explain how it occurred.

How is the momentum of an object determined?
What happens every time one of the boys playing ping pong hits the ball?
How could the boy playing ping pong keep from hitting the ball off the table?
I GIVE 20 PTS PLS HEELP

How does this model explain the causes of seasonal changes in the Northern Hemisphere?
In your response include the following information:

- Identify which stage (number) of the model represents summer and which represents winter in the Northern Hemisphere.

- Describe how Earth's tilt on its axis affects the intensity of solar energy during the summer versus winter months.

- Explain how the orientation of Earth and its positions in its orbit around the Sun causes the change in seasons in the Northern Hemisphere.

What measures the energy of a wave?

The corn crop in an area is prone to infestation by larvae from moths that feed on the cornstalks and ears of corn. The techniques used by two farmers to protect the corn crop are described below.

Technique A: Sprayed his corn crop with an insecticide. The insecticide is known to kill all honeybee, butterfly, and moth larvae.
Technique B: Used a genetically modified variety of corn. The plant produces an insecticide which selectively kills only the moth larvae as it feeds on the corn.

Which technique is likely to have less of an impact on the environment?

Technique B because it may help humans who consume corn to fight bacteria
Technique A because it kills a broader variety of insects to protect the corn
Technique B because it preserves the harmless insects and targets only the moth larvae
Technique A because insecticide use is better for preserving the environment.

Jenna notices that the speed of the wind has increased throughout the day. What is causing the faster wind?

There has been no precipitation.
The difference in air pressure has decreased.
The difference in air pressure has increased.
The direction of the wind has changed to the south.

Mimicry is a pattern of coloring that makes an organism resemble another organism. Milk snakes, which are harmless, resemble coral snakes, which are deadly. Milk snakes with which of the following characteristics are most likely to survive?

help me with this I only have one more
1156 g/L
= ________ kg/mL

science help please 20 points

Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()Na2HPO4 → ( )Na4P2O7 + ( )H2O

Question This is a Science Test 15 POINTS OR MORE POINTS!

The following picture contains four beakers with four different colored solutions, light blue to dark blue. Which solution is the most concentrated?

A. the second solution from the left
B. the first solution (left-most)
C. the fourth solution from the left (right-most)
D. the third solution from the left

Ionic Bonds are formed when two elements _________________.

Frank has an eraser It has a mass of 4g and a volume of 2ml What is its density hint Density equals mass and volume

what is a chemical change of a juicy burger and a waffle fry

Follow these steps:

Carefully measure out 3 Tablespoons of cold water into the jar.

Now measure out 1/8 teaspoon of salt and put it into the jar with the water. Put the lid on the container and shake it. Keep shaking until the salt is completely dissolved. To determine whether it has completely dissolved, hold the container up to the light and look carefully at the bottom, or open the lid and look into it. If you see little grains of salt there, it is not completely dissolved, so keep shaking until it looks the same each time you look.

If the salt does not dissolve completely after five minutes of vigorous shaking, write this in your notebook and go on to step 4. If the salt dissolves completely, add another 1/8 teaspoon of salt and repeat the process. Repeat over and over, keeping track of how many 1/8 teaspoons you add. Stop when you can’t get the salt to dissolve no matter how hard or long you shake the container.

Record how much salt you were able to dissolve in the 3 Tablespoons of water in the solubility data table.

Repeat steps 1-4, but this time using very warm or hot water. Before you do it, run the jar under hot water to warm it up so the water doesn’t cool off right away. Be sure to use the same amounts of water and salt as you did the first time. The only variable should be the temperature of the water.

Record your results, and then compare them with your previous results.
Were there any differences in the amount of salt that dissolved in the warm water versus the cold water?

Please help me por favor :'(

What was one was one important impact of Supreme Court's ruling in Bush v. Gore