admin

admin

Chemistry Middle School

How are the structures of a plant cell different from an animal cell?

How are the structures of a plant cell different from an animal cell?

2 months ago

Solution 1

Guest

Guest #4052

2 months ago

Animal cell doesn't have cell wall

📚 Related Questions

Question

Definition: One of a class of elements having properties intermediate to metals and nonmetals.

Solution 1

Answer:

Metalloids

Explanation:

Metalloids are compounds whose properties are intermediate between those of metals and non metals. That is, they do not behave as pure metals, neither do they behave as pure nonmetals. For instance, the electrical conductivity of metals decreases with temperature while nonmetals do not conduct electricity at all under any condition. However, metalloids conductivity increases with increase in temperature because they conduct electricity in a manner slightly different from the manner in which metals conduct electricity.

Solution 2

Metalloids are a class of elements having properties intermediate to metals and nonmetals.

Question

Why does decreasing the temperature of orange juice increase its pH level? Is it something to do with the chemical equilibrium?

Solution 1

Because you are getting rid of the acid in the juice so you are balancing the equilibrium because you have lesd acid and the base is the same making it more equal

Question

Gas in a balloon occupies 3.3 L. What volume will it occupy if the pressure is changed from 100.0 kPa to 90.0 kPa (at constant temperature).

Solution 1

Boyle's law says "the pressure of a fixed amount of an ideal gas is inversely proportional to its volume when the temperature is constant".

P α 1/V

Where P is pressure of the gas and V is the volume of the gas.

Hence, we can use Boyle's law for two different situations as,

P₁V₁ = P₂V₂

P₁ = 100.0 kPa = 1 x 10⁵ Pa
V₁ = 3.3 L
P₂ = 90 x 10³ Pa
V₂ =?

By substitution,
1 x 10⁵ Pa x 3.3 L = 90 x 10³ Pa x V₂
V₂ = 3.7 L

Hence, if the pressure drops from 100 kPa to 90 kPa, then the volume of the gas will be 3.7 L.

Here, we made an assumption as the gas is an ideal gas.

Question

How is a circle different from an ellipse

Solution 1

A circle is a closed curved shape where all the lines from the edge to the center are the same length. An ellipse varies in length.

Question

Which aqueous solution of Kl freezes at the lowest temperature? a) 2 mol of Kl in 1,000. g of water b) 1 mol of Kl in 1,000. g of water c) 2 mol of Kl in 500. g of water d) 1 mol of Kl in 500. g of water

Solution 1

Answer:

c) 2 mol of Kl in 500. g of water

Explanation:

Colligative properties such as melting and boiling points and osmotic pressure all depend on the amount of solute present. The more the concentration of solute present, the greater the degree of display of colligative properties by a solution

Considering the options given, 2 mol of Kl in 500. g of water has the highest concentration and is expected to freeze at the lowest temperature.

Solution 2

The correct answer is B.
Lowering of the freezing point can be a colligative property. The greatest concentration of mass of salt in the water will have what we call the lowest freezing point.
For example the least amount of water in the greatest amount of salt.

Question

Why is a hydraulic system useful?

Solution 1

Hewoooo!!!

Hydraulics are used in the braking system of a car. They cause a relatively small force from the driver's foot to be multiplied to produce a greater force, which acts equally on all four brake pads. ... The transmitted pressure acts on this larger area to produce a larger load force on the brake pads.

i think they are helpful, it just depends what your using them for :D

Question

What is "carbon neutral"

Solution 1

its is making no net release of carbon dioxide to the atmosphere,especially through offsetting emissions by planting trees

Solution 2

Carbon Neutral means making no net release of carbon dioxide to the atmosphere, especially through trees. (●´ω｀●)

Question

State one advantage of building a space station in orbit instead of sending it all up in one piece.

Solution 1

Building a space station in orbit is a safety measure. If a rocket fails to bring up the entire space station in one piece it would be extremely expensive to build a new one. Bringing it up in multiple places ensures less money would be lost if the rocket fails.

Question

Extreme (1, 2, or 3) in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The (4, 5, or 6) of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei. 1. expansion 2. heat 3. density 4. size and luminosity 5. force and speed 6. mass and temperature

Solution 1

Extreme (Heat) in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The (force and speed) of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei.

Solution 2

Answer:

2. heat

5. force and speed

Explanation:

Nuclear fusion in stars causes the hydrogen atoms to collide with each other and form the heavier helium atom. The fusion reaction is therefore:

₁H² + ₁H² → ₂He⁴

Extreme heat in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The force and speed of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei.

Question

Why is radioactive decay a good method of measuring the absolute age of ancient fossils

Solution 1

radioactive decay is a good method of measuring the absolute age of ancient fossils because radioactive decay could be measure and confront again time in the most trusted and verifiable way, as it allows to have a degree of certainty that other measurements have not yet reached. it is also easy to test and compare with other methods.

Solution 2

Answer:

All ancient fossils contain C-14

Explanation:

All living things contain more than one isotope of carbon, the most prominent being, carbon -12 and carbon-14.

Carbon-14 is a radioactive isotope of carbon. When the artifact is retrieved, the activity of carbon-14 in that sample is matched with the carbon-14 activity of a living organism. When this is done, the age of the fossil can easily be accurately calculated.

📂 Subjects

Mathematics 2647929

History 842281

English 748681

Biology 586256

Social Studies 406852

Chemistry 368373

Business 348603

Physics 324927

Health 199835

Spanish 130075

Geography 112100

Computers and Technology 106146

Arts 77164

Advanced Placement (AP) 23675

World Languages 23213

French 22589

Engineering 19607

Law 17108

Medicine 13966

SAT 10987

German 3389

🔢 Grades

High School 3423409

Middle School 2092250

College 1518097