PLEASE HELP!!!! ANSWER 2 QUESTIONS FOR 50 POINTS AND BRAINLIEST!

Answer:

Yes an atom is a system because,the Bohr or solar system model of the atom states that atoms consist of a nucleus with a number of electrons in orbits around that nucleus, similar to a solar system. People have speculated that perhaps atoms are tiny solar systems.

Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.

A hoodoo is indeed a tall, thin rock spire created by erosion. It is also known as a tent stone, fairy chimneys, and earth pyramid. Typically, hoodoos are made of very brittle rock that is covered in harder, less brittle stone that shields each column first from weather.

Hoodoos can have varying colors over the course of their height due to minerals deposited within various types of rock. Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.

Therefore, some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.

To know more about rock, here:

https://brainly.com/question/29767269

#SPJ3

Answer:

The ratio of the masses of gold in the two compounds = 3 : 1

Explanation:

In compound 1:

15.39 g of gold combines with 2.77 g of chlorine

mass of gold that will combine with 1 g of chlorine  = 15.39/2.77 = 5.55 g

In compound 2:

7.74 g of gold combines with 4.18 g of chlorine

mass of gold that will combine with 1 g of chlorine  = 7.74/4.18 = 1.8 g

Ratio of gold in the that combines with 1 g of chlorine in the two compounds is given as

5.55/1.85 = 3

Therefore, the ratio of the masses of gold in the two compounds = 3 : 1

Answer:

C

Explanation:

Answer:

19

Explanation:

10 + 9 protons plus neutrons

Answer:

A. Mechanical

Explanation:

Mechanical energy is the sum of an object's kinetic energy and potential energy, which are both energies of motion.

Answer:

B or D its a tuff call because

Explanation:

the cell membrane keeps toxic substances out of the cell.  they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles

Answer:

B. Contains and protects the cell

C. Is made of a double layer of phospholipids

D. Contains proteins that allow materials to pass through.

Explanation:

All are true except A. Is not a true organelle.

The cell membrane is absolutely an organelle.

Hope this helped!

Answer:

heat lost by iron bar is 168.2 kJ

Explanation:

The heat gained by the water as a result of temperature rise is given by:

Q = mCΔT

ΔT = change in temperature = final temperature - initial temperature = 89°C - 22°C = 67°C

m = mass of water = 600 g

C = specific heat of water = 4.184 J/g-K

Q = heat gained

Substituting:

Q = 600 * 4.184 * 67

Q = 168.2 kJ

The heat gained by the water is 168.2 kJ

The heat lost by iron bar = heat gained by water

heat lost by iron bar = 168.2 kJ

Answer:

A: A system of folded membranes

Explanation:

The endoplasmic reticulum is one of the organelles found in an eukaryotic cell. It is a membrane-bound organelle made up of two structures called CISTERNAE (sac) AND SHEET (membranous)

The endoplasmic reticulum is part of the endomembrane system, which is a system of folded membranes, which extends to the membrane that bounds the nucleus. It is of two types viz: rough endoplasmic reticulum and smooth endoplasmic reticulum.

Answer:A

Explanation:

The chemical formula depicts the atoms of the elements involved in the substance. In the given substance, ammonium carbonate ((NH₄)₂CO₃), there are 8 hydrogen atoms. Thus, option D is correct.

The chemical formula has been the representation of the elements involved in the chemical reaction with their relative proportions and symbols. It uses subscript to show the number of atoms involved along with the coefficients.

In a chemical compound like ammonium carbonate, there are various elemental atoms involved like nitrogen, hydrogen, carbon, and oxygen. There are two nitrogen, eight hydrogens (4 × 2), one carbon, and three oxygen atoms involved.

Therefore, in option D. there are eight hydrogen atoms in ammonium carbonate.

Learn more about chemical formulas, here:

https://brainly.com/question/16950183

#SPJ2

A chemical reaction can be expressed in terms of:

The skeleton equation is still in unbalanced form

so only chemical formulas of reactants and products so that the relative amounts of the reactants and products are not included

For example :

Ethane + Oxygen ⇒ Carbon dioxide + Water

C₂H₆ + O₂ ⇒ CO₂ + H₂O

2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O

2C₂H₆ + 7O₂ ⇒ 4CO₂(H₂0 is still missing)

Answer:

iodine is shining non metal

Explanation:

because as it is a metalloid .(shows partially metal and non metal),it shows lustor property of metal.

Answer:

C . Melting point

Explanation:

Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density

Answer:d

Explanation:

Answer:

The correct answer is D. velocity

Explanation:

I had that same question

Answer:

in my opinion its going to be B because the moles of experiment I are more than moles of experiment II

Answer:

The boiling point of water at sea level is 100 degrees Celsius, or 212 degrees Fahrenheit.

osmium, magnesium, titanium, iron

Explanation:

Answer:

The phenomenon that works here is called Total internal reflection

Explanation:

When the angle of incidence is increased past the critical angle, the refracted angle will not exit the medium and all incident light will reflect back off a boundary back into the first medium.

This phenomenon is called Total Internal Reflection. Total Internal Reflection will only occur with a large angle of incidence that is greater than the critical angle.

Now, when we talk about the second medium  

using the Law of refraction

Sini/Sinr =refractive index of medium 2/ refractive index of medium1

when the light ray passes from denser medium to rarer medium TIR happens along with angle of incident should be greater than critical angle. In this case incident angle is 45 degrees

conclusion: medium 2 is rarer here than medium 1

Answer:

See explanation

Explanation:

a) number of moles = reacting mass/molar mass

Reacting mass = 10g

Molar mass of CaBr2= 200 g/mol

Number of moles = 10g/200g/mol

b) Avogadro's number = 6.02 × 10^23

c) melting point of the CaBr2

Recall that pure substances have sharp melting points while impure substances melt over a range of temperatures.

d) They are both halide salts of calcium hence they are expected to display similar chemical properties.

Answer:

Glycogen

Explanation:

Answer:

When the bell is rung the switch closes allowing electricity to flow making the hammer hit the bell, making the sound to alert people in the house.

Explanation:

Answer:

You can convert between the various different sizes by merely moving the decimal point the correct number of places. The basic metric units are meters (for length), grams (for mass or weight), and liters (for volume).

Explanation:

Answer:

hello your question is incomplete below is the missing part of the question

A biochemist performs an experiment to study the behavior of water molecules near proteins. He concludes that water molecules occur in groups of five in the presence of proteins.

answer : Ensure that his conclusion is supported by evidence.

Explanation:

Skepticism during the conduction of an experiment is an act/trait that a scientist possess that will make him/her repeat an experiment for the purpose of verifying the data gotten from the previous experiment

hence the answer to the question is to Ensure that his conclusion is supported by evidence.

Answer:Chemical properties can be contrasted with physical

Explanation:

Answer:

+1

Explanation:

lithium is in group 1 of the periodic table and all group 1 elements have a charge of +1

Explanation:

A. Cl⁻

B. Na⁺

C. Mg⁺⁺ Or Mg²⁺

D. O²⁻

E. Al³⁺

F. N³⁻

G. Be²⁺

H. Ne (No charge because it's an noble element)