Ionic compounds dissolved in water are better conductors of electricity than when they are in solid form. Why is this true?

Answer: In their bonded, solid states, molecules like salt don't conduct electricity. But when they're dissociated in a solution or through melting, they can carry a current. This is because electrons can't move freely through water (in the same way they do in a conductive wire), but ions can move freely

Explanation:

What is the charge on the Cr in Cr2O72-

?What statement best describes the arrangement of the atoms in an ethylene molecule?

Why is it necessary to ensure that unreacted chlorine gas is passed into a fume cupboard when reacting with alumnium?

HELP ME PLEASE : !! WORTH 15 POINTS !!

What is the difference between a conductor and an insulator of electricity?

Insulators cause electricity to heat up, and conductors block the flow.

Conductors slow electricity down, and insulators speed it up.

Conductors allow the flow of electricity, and insulators block the flow.

Insulators allow the flow of electricity, and conductors block the flow.

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.

The products of a reaction are NaCl and H2O. What does the law of conservation of matter reveal about the reactants in the reaction? A. At least some of the reactants will include NaCl and H2O. B. The reactants will contain only Na, Cl, O, and H in some amounts. C. Na, Cl, O, H, and three other elements were the reactant elements. D. The reactants will have one Na, one Cl, one O, and two H atoms.

Which of the following statements fully describes what an object may do when it experiences unbalanced forces? Select the two best answers.

A. It may change directions.

B. It will move at a constant speed.

C. It may slow down.

D. It may slow down or speed up.

E. It will stay stationary.

Ravi and Tina were working on a project based on ‘Changes around us’, for which they were observing different changes occurring in their daily life. They went to kitchen where they saw their mother was cooking food on LPG stove. Ravi said that burning of LPG in LPG stove involves chemical change. But Tina argued that both physical and chemical changes are involved in this process. According to you who is correct and why?
Note: will mark Brainliest but Please do not copy answers from the internet!

Is the size of the country an important factor in how much helium that can be found there?

Is there a relationship between CO2 levels rising and heavy precipitation? If so, what is it?

In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.

How might a living and a nonliving element in a forest interact?

A deer eating the leaves from small bushes

B a bird building a nest in a tree

C a bear living in a hollowed-out log

D a hawk scooping up a snake to eat

Students find another rock that is sandy and white. They drip hydrochloric acid on the rock, but it does not fizz. Describe the processes that contributed to the formation of this rock.

pleasee help!

Which simple machines make up scissors?

A) one lever and one wedge
B) two levers and two wedges
C) one inclined plane and two pulleys
D) two inclined planes and two levers

I need help quickly, this assignment is due in a few hours. I have a few 8th grade science questions I need help with. These is not need to explain your answer, just tell me if the answer is a,b, or c. Also, please answer all of the questions listed not just some of them. I will be giving 20 points if you answer, and brainly to the first person to answer. The questions look really complicated but it is mainly just a long description. The questions themselves seem simple.

QUESTION ONE : Miranda was learning to bake bread at home. Her first few batches of dough did not rise, or expand, as much as they should have. Miranda's mother noted that the kitchen was cold and suggested that the dough might not be warm enough to rise. Miranda decided to test her mother's suggestion. She made a large batch of dough and divided it into six equal-sized balls. Then, she put each ball into a bowl. She left three bowls on the counter in the kitchen, where the temperature was 63oF. She left the other three bowls on her desk in her upstairs bedroom, where the temperature was 80F. After one hour, Miranda measured the size of each dough ball.

Which of the following was the dependent variable in the experiment?
a. the temperature where the dough was left to rise
b. the ingredients used to make the dough
c. the size of each dough ball

QUESTION TWO: Jada liked to make guacamole, but she could often find only unripe avocados at the grocery store. In biology class, Jada learned that ripe fruits produce a gas called ethylene that can cause other fruits to ripen. Jada wondered whether storing ripe bananas with unripe avocados would make the avocados ripen faster. Jada prepared four paper bags with five unripe avocados in each bag. She added on ripe banana to two of the bags. Then, Jada sealed all four bags. After three days, she opened each bag and counted the number of ripe avocados in each bag.

Which of the following was the independent variable in this experiment?
a. the type of paper bag used
b. the number of bags with a ripe banana
c. the number of ripe avocados

QUESTION THREE: Colette was using steel to make rusted sculptures. After building each sculpture, she caused the steel in the sculpture to rust by placing it into tub filled with salt water for eight hours. Colette wondered if steel would rust faster submerged in vinegar instead of salt water. To find out, Colette cut ten squares of steel sheet metal and split them into two equal groups. She put one group of squares into a tub filled with salt water and the other group of squares into a tub filled with vinegar. Once an hour for eight hours, Colette counted the number of rusted steel squares in each group.

Which of the following was a variable that was held constant (control variable) in this experiment?
a. the type of liquid used
b. the size of the squares of steel sheet metal
c. the number of rusted steel squares

QUESTION FOUR: David divided 40 unripe bananas evenly among eight paper bags and sealed the bags. He poked 20 small holes in four of the bags and left the other four without holes. He kept the bags at room temperature for three days. Then, David opened the bags and counted the number of brown spots on each banana. He compared the average number of brown spots on bananas from bags with holes to the average number of brown spots on bananas from bags without holes.

Identify the question that David's experiment can best answer.
a. Do bananas develop more brown spots when they are kept at room temperature compared to in a cold refrigerator?
b. Do bananas develop more brown spots if they are kept in bags with holes compared to bags without holes?
c. Do bananas develop more brown spots when they are kept in brown paper bags compared to in a plastic bag?

QUESTION FIVE: Ten groups of chemistry students combined three solutions that, when mixed, chemically reacted and turned blue. Before mixing, five groups of students heated the solutions to 25C, and five other groups heated the solutions to 50C. The students recorded how many seconds it took for the mixtures to turn blue. Then, the groups shared their results, and the class compared the time it took for the mixtures to turn blue at 25C and at 50C.

Identify the question that the students' experiment can best answer.
a. Does the type of color the mixture produces depend on the temperature of the solutions?
b. Does the mixture of solutions release more gas when they are mixed at 25C compared to 50C?
c. Does the mixture's color change faster when the solutions are mixed at 25C or 50C?

1. Using D10W and a vial of NaCl 4 mEq/mL, how many mL of NaCl are needed to prepare 250 mL of a
D10/NS solution?
a. 4.8mL
b. 9.6ml
c. 19.6mL
d. 154mL

A new element called Oganesson (Og) with an atomic number of 118 was created in a science lab in Russia. The properties of Og are currently unknown.

Based on its location in the Periodic Table, which properties can be predicted?

mildly reactive with metals

highly reactive with metals

unreactive with nonmetals

highly reactive with nonmetals

Which type of selection is shown in the graph above?
A. Disruptive selection
B. Stabilizing selection
C. Disaster Selection
D. Directional selection

Most cells have a(n) in the center of the nucleus which stores materials to make ribosomes.

The forces from below the surface that change the surface of the earth are

Erosion
Earthquakes
Volcanoes
Living things
Weathering
Faulting
Folding
Glaciers

I NEED HELP ASAPPPPPPPPPPPPPPPP

Compare your predicted ranking of the objects’ volumes with their final ranking based on their measurements. What are the advantages of quantitative observations – using measurements – over qualitative observations – without measurements?

write a short story using the characteristics of the subatomic particles and their locations in the atom. For example, you need a positive character, a neutral character, and a negative character. You need two different locations. One to be the center location of the story and the other to be outside the center. At a minimum you should have at least 1 paragraph with about 5 sentences. Make sure that you use complete sentences.
Make sure it is school appropriate!!

Properties of cotton ball

Which of the following is an example of work being done?

A) You push hard on a boulder, but it won't budge.
B) You push a box and it slides across the room.
C) You stand in line with your arms full of groceries.
D) You hang on tight to a rope with your feet off the ground.

There are 2 main types of _______. One is a _______, where electrons are shared between atoms. The other is an _______, where one atom loses an electron to become a _______ charged ion, and the other atom gains the elctron to become a _________ charged ion.

Who would most likely need thermal clothing?

A. a tourist on a tropical beach

B. an explorer at the South Pole

C. a dancer performing in a classical ballet

D. a woman attending a religious service

Match these items.

1. imprint of plant or animal
original-remains fossil
2. undecayed plant or animal part
carbonized fossil
3. replaced by a mineral
petrified fossil
4. only carbon remains
cleavage
5. mountain
geology
6. from magma
metamorphic
7. from physical and chemical changes
igneous
8. sandstone
print fossil
9. helps identify rocks
landform
10. science of Earth
sedimentary

pls help and look at both ily

(WHOEVER DOES THIS GETS BRAINLEST!!) describe the structure of the earth in your own words. (pls add some detail and pls dont make it too short thx)