Due today please please help!! :

When a metal conducts electricity, the charge is carried by electrons moving through the metal.

Answer:

Boiling/melting point

Explanation:

Some elements can’t handle the heat nor the cold, so they separate like oil & water.

Answer:

The heart

Hand

Explanation:

The part of the human body that has the same role as the power source in a computer is the heart. A power source in a computer provides energy that powers the whole system.

Also, keyboard and mouse are input devices. They are used to give instruction and perform certain tasks on the computer system.

The volume of the gas at STP = 35.01 L

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure).

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

V=17.4 L

T = 23 + 273 = 296 K

P = 2.18 atm

[tex]\tt mol=n=\dfrac{PV}{RT}\\\\n=\dfrac{2.18\times 17.4}{0.082\times 296}\\\\n=1.563[/tex]

The volume of the gas occupy at STP :

[tex]\tt 1.563\times 22.4=35.01~L[/tex]

Answer:

A.) It cannot be quickly replaced.

Explanation:

Aluminum is extremely useful to humans but is semi-difficult to produce. Because of this, your answer will be numero uno. (Or A.)

Answer:

Explanation:

Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere. Without photosynthesis, the carbon cycle could not occur, oxygen-requiring life would not survive and plants would die. ... The importance of photosynthesis in our life is the oxygen it produces

Answer:

the formation and evolution of stars and galaxies

Explanation:

One of the topic an astronomer will most likely study is the formation and evolution of stars and galaxies.

Astronomers are scientists that studies the universe, its components and how it works.

Answer:

s = 0.30 m/s

Explanation:

Given data:

Distance travel = 1.5 m

Time taken = 5 s

Average speed of box = ?

Solution:

s = d/t

s = speed

d = distance

t = time

by putting values,

s = 1.5 m/ 5 s

s = 0.30 m/s

Answer: A.HCI

Explanation:

Answer:

Select one of the readings in this unit and in at least one hundred words, discuss how immediacy, foreshadowing, and commentary work to show author's purpose, meaning, or tone and style.

Explanation:

Select one of the readings in this unit and in at least one hundred words, discuss how immediacy, foreshadowing, and commentary work to show author's purpose, meaning, or tone and style.

Substances that are chemically bond together are called compounds.

A substances may or may not consist of components that are chemically combined together.

Substances that are composed of components that are chemically combined together are called compounds. If the components are not chemically combined, the substance is called  a mixture.

Examples of chemical compounds include; CH3COOH, CaCO3 etc

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Answer:

b cause it's a mixture of two elements

Mass of Copper(I) chromate( CuCrO₄) = 19.75 g

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\tt \large{\boxed{\bold{mol=\dfrac{m(mass)}{MW(molecular~weight)}}}[/tex]

0.11 mole of Copper(I) chromate( CuCrO₄) ⇒ MW=179.54 g/mol, so mass :

[tex]\tt mass=mol\times MW\\\\mass=0.11\times 179.54\\\\mass=19.75~g[/tex]

Answer:

Manganese(II) sulfide

Explanation:

is a chemical compound of manganese and sulfur. It occurs in nature as the mineral alabandite (isometric), rambergite (hexagonal), and recently found browneite (isometric, with sphalerite-type structure, extremely rare, known only from a meteorite).

The chemical name for MnS₂ is manganese sulfide.

Ionic compounds are formed when ions with opposing negative and positive charges form ionic bonds and form compounds, which are compounds made of ions.

Ionic compounds are named by stating the cation first, followed by the anion. When a neutral atom loses one or more electrons, it acquires a positive charge and is called a cation and when an atom gains one or more electrons, it becomes an anion and acquires a negative charge.

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Answer:

im pretty sure its: homogeneous mixture

Explanation:

Answer:

Some notable differences between a main sequence star and a red giant are its sizes and color. Red Giants tend to typically be, well, red. The output of a red giant is so much greater than that of a main sequence. A red giant is the last stage of a main sequence star's life. Another difference is what occurs inside the star. Main sequence stars fuse hydrogen together in order to keep gravity from imploding the star, while red giants run short of hydrogen and fuses helium.

Diagram:

Answer: The bus traveling 200km in 6 hours is traveling the fastest.

Explanation:

Bus 1

150km/5hrs

Simplify -> 30km/hr

Bus 2

200km/6hrs

Simplify -> About 33.333km/hr

Answer:

00000

Explanation:

Answer:

Pretty sure it's Polar Covalent because they are proven to have a higher melting point than both Ionic, and Non Polar Covalent substances. That is due to the fact that it takes more energy to separate molecules from each other, which is what the molecules in Polar Covalent substances do, which is why it has a higher boiling point than the other choices.

Answer:

D dark colors absorb the sun more cause the wants to make everything bright I hope I helped :)

The statement " Darker colors absorb more energy from electromagnetic waves than lighter colors do." is correct.

When an electric field collides with a magnetic field, electromagnetic waves are created. As a result, they're called electromagnetic waves.

Light, often known as visible light, is electromagnetic radiation that falls within the region of electromagnetic wave or spectrum that the human eye can perceive.

White is a mixture of all seven colors found in the white light spectrum, including Violet, Indigo, Blue, Green, Yellow, Orange, and Red. This visible spectrum has a wavelength of 400 to 700 nanometers. When an object appears to be a particular color, such as red, it signifies that it is projecting the wavelength of red light  (620 to 750 nanometers) while absorbing all other wavelengths. Furthermore, because  light is a kind of energy, the more light a thing consumes, the more heat it consumes.

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Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.

GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)

Pls brainliest! :)

Answer:

help with what tho-

Explanation:

Answer:

2.

Explanation:

When you put the paper in a solution, it will turn blue if it is basic, or red if it is acidic. If it does not change color, it is fairly neutral.

Complete Question:

In order to help visualize an atom, a scientist may do which of the following?

Group of answer choices

A. Form a hypothesis.

B. Make a model.

C. Create a law.

D. Develop a theory.  

Answer:

B. Make a model.

Explanation:

An atom can be defined as the smallest unit of matter and it retains all the chemical properties associated with the element.

Basically, atoms are the building block of matters and essentially comprises of three (3) fundamental particles which are protons, neutrons and electrons which typically determines the charge and mass of an atom.

In order to help visualize an atom, a scientist may make a model. Due to the limitations of various human inventions in the field of science, it has become practically impossible to get an image or a picture of an atom even through the use of a microscope because of its minute nature and owing to the fact that it is much smaller than the wavelength of visible light.

However, some notable scientists have created or developed models that aids in the understanding and visualization of atoms. These atomic models are;

1. Quantum mechanics model of atom.

2. John Dalton's atomic model.

3. Neil Bohr's atomic model.

4. Rutherford's model of the atom.

5. Thomson's model of the atom.

6. Plum pudding atomic model.

Answer:

Average atomic mass  = 79.9 amu.

Explanation:

Given data:

Average atomic mass of Bromine = ?

Atomic mass of 1st isotope = 78.92 amu

Relative abundance of 1st isotope = 50.69%

Atomic mass of 2nd isotope = 80.92 amu

Relative abundance of 1st isotope = 49.31%

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (50.69×78.92)+(80.92×49.31) /100

Average atomic mass =  4000.45 + 3990.16 / 100

Average atomic mass  = 7990.61 / 100

Average atomic mass  = 79.9 amu.

Explanation:

This is a neutral beryllium atom

Answer:

0.2 moles

Explanation:

The number of moles of aluminum for 1.204 x 0²³ atoms of aluminum is 0.2 moles. Hence, The correct answer is Option (A)

Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g.

The number of particles present in one mole of any substance = Avogadro Number = 6.023 x 10²³.

Formula to calculate Mole when number of particles is given ;

n = given number /  6.023 x 10²³

n = 1.204 x 10²³ / 6.023 x 10²³

n = 0.2 moles

Therefore, The number of moles of aluminum for 1.204 x 0²³ atoms of aluminum is 0.2 moles. Hence, The correct answer is Option (A)

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Answer:

V₂ = 28 mL

Explanation:

Given data:

Initial temperature = 303 K

Initial volume = 30.0 mL

Final temperature = 283 K

Final volume = ?

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 30.0 mL × 283 K /303 K

V₂ = 8490 mL.K / 303 K

V₂ = 28 mL

Answer:

This soda is brown, sweet, has high carbonation, and is about 200 calories when consumed.

Explanation:

:)

Answer:

A rolling ball eventually slows down and comes to a stop