CHEMISTRY MIDDLE SCHOOL

Why can’t alpha particles penetrate deeply into solids

Answers

Answer 1
Answer:

Because, alpha particles have low velocity.


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MIDDLE SCHOOL

In plants, carbon dioxide and water combine to form glucose and oxygen. This process is known as photosynthesis. Which of the following is the balanced equation for this process?
A.
B.
C.
D.

Answers

Answer:

Explanation:

Since the equation is not given, let us write and balance it:

  Reactants: Carbon dioxide (CO₂)

                      Water(H₂O)

 Products: Glucose(C₆H₁₂O₆)

                   Oxygen(O₂)

The reaction equation is shown below:

                  CO₂ + H₂O → C₆H₁₂O₆ + O₂

But the equation is not balanced:

    to balance the equation

          aCO₂ + bH₂O → cC₆H₁₂O₆ + dO₂

  for C:

         a = 6c, if c = 1 then a = 6

  for O:

        2a + b = 6c + 2d

  for H:

       2b = 12c, since c = 1, b = 6

In 2a + b = 6c + 2d, solving for d:

   2(6) + 6 = 6(1) + 2d

      18 = 6 + 2d

         d = 6

Therefore, the balanced equation is:

                       6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

HIGH SCHOOL

Can an ionic compound ever consist of a cation-cation or anion-anion bond?

Answers

No, it is impossible. By definition, an ionic compound is a combination of two elements, one of which is a metal while the other is a nonmetal. Together, they form an ionic bond, which is a complete giving and accepting of electrons to satisfy their full octet individually. A cation-cation or anion-anion bond is a different type of bond called covalent bond. This involves sharing of electrons.
COLLEGE

How many moles of bromine atoms are in 2.60 × 102 grams of bromine? 1. 0.0152 mol 2. 79.9 mol 3. 10.5 mol 4. 3.25 mol 5. 2.29 mol 6. 0.308 mol 7. 48.6 mol?

Answers

Moles  =mass/ molar  mass  of  the  bromine  atom
the  molar  mass of  bromine  atom  is  79.904g/mol
mass=2.60  x10^2
therefore  the  moles  of  bromine  atom=
2.60  x10^2g/ 79.904g/mol  =3.25gmoles(answer  4)
There are 3.25 mol of bromine atoms in 2.60 x 102 grams of bromine. I reached this answer by converting grams to moles. To do this, I divided the number of grams that I have of bromine by the weight of bromine. The weight of bromine is 80 grams. So my equation looks like this when it is all set up: 2.6 x 10^2 g/80g. The answer to the equation is 3.25 mol.
COLLEGE

The nonvolatile, nonelectrolyte sucrose, C12H22O11 (342.3 g/mol), is soluble in water H2O. Calculate the osmotic pressure (in atm) generated when 12.8 grams of sucrose are dissolved in 278 mL of a water solution at 298 K.

Answers

Answer: The osmotic pressure of the solution is 3.29 atm

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

or,

where,

= osmotic pressure of the solution = ?

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of sucrose = 12.8 grams

Molar mass of sucrose = 342.3 g/mol

Volume of solution = 278 mL

R = Gas constant =

T = temperature of the solution = 298 K

Putting values in above equation, we get:

Hence, the osmotic pressure of the solution is 3.29 atm

HIGH SCHOOL

What determines the chemical properties of an element?

Answers

Answer:

The chemical properties of an element are determined by the configuration of its electrons in orbit around its nucleus. The number of electrons in orbit is equal to the number of protons in the nucleus (each proton has an an electrical charge of plus one, while each electron has the same charge only negative one).

Explanation:

MIDDLE SCHOOL

Active transport occurs through which type of biomolecules​

Answers

In primary active transport, the proteins involved are pumps that normally use chemical energy in the form of ATP. ... These proteins have receptors that bind to specific molecules (e.g., glucose) and transport them across the cell membrane. Because energy is required in this process, it is known as 'active' transport.

MIDDLE SCHOOL

What are two ways to tell if a chemical reaction is taking place?

Answers

A chemical reaction is observed by physical effects that cannot be undone, for Ex. If an object give off heat or light, thats a chemical reaction. If theirs a change in an objects color it can be a chemical reaction, like rust. Metal turning silver to brown. 
1) temperature change
2)odor or smell change
Hope this helps
MIDDLE SCHOOL

The lowest stratum of the atmosphere is the ______________. stratosphere

troposphere

mesosphere

2.

Most of the earth's ozone is located in the _______________.

stratosphere

troposphere

mesosphere

3.

Earth's coldest temperatures occur in the _______________.

stratosphere

mesosphere

troposphere

Answers

1) Troposphere 2) Stratosphere 3) Mesosphere
The answer is Tropusphere, Struosphere, and Mesosphere
:)
MIDDLE SCHOOL

Using the knowledge of kinetic particle theory, when salt is dissolved in a glass of water without stirring, all of the water soon tastes salty.

Answers

According to the concept of solubility and kinetic particle theory, when salt is dissolved in a glass of water without stirring, all of the water soon tastes salty because salt and water particles are colliding.

What is solubility?

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

Learn more about solubility,here:

brainly.com/question/29589228

#SPJ5

Explanation:

This is because the salt particles are colliding with the water particles

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