CHEMISTRY HIGH SCHOOL

Which is a property of a base? (Chemistry test need help please) A. Unreactive

B. Strong Color

C. Watery feel

D. bitter taste

Answers

Answer 1
Answer: The answer is C . Watery feel

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COLLEGE

Which of the following chemical reactions is an oxidation-reduction reaction? a. CuSO4 + BaCl2 yields BaSO4 + CuCl2
b. Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3
c. N2 + 3H2 yields 2NH3
d. K2SO4 + BaCl2 BaSO4 + 2KCl

Answers

C. N₂ + 3H₂ → 2NH₃
In a redox, or oxidation-reduction, reaction, one of the reactants must be reduced, which means its oxidation number decreases, while the other reactant must be oxidized, which means its oxidation number increases. The oxidation number of nitrogen in the reactants is 0 and is -3 in the products, so it is reduced. Similarly, the oxidation number of hydrogen is 0 in the reactants but it is +1 in the products.
MIDDLE SCHOOL

Use the drop-down menus to identify the definition of radiation and the different types of radioactive emissions. ______is the process of emitting radiant energy in the form of waves or particles.
______is two protons and two neutrons bound together into a particle identical to a helium nucleus. is a negatively charged electron emitted by the nucleus.
______is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus.

Alpha particle

Beta particle

Gamma ray

Radiation

Help me quickly please! I don't get it! T.T

Answers

radiation :

-> is the process of emitting radiant energy in the form of waves or particles.

alpha particle :

-> is two protons and two neutrons bound together into a particle identical to a helium nucleus.

beta particle :

-> is a negatively charged electron emitted by the nucleus.

gamma ray :

-> is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus.

I just took it, these are the correct answers ;)

Explanation:

Radiation is defined as an electromagnetic energy which travels in space in the form of waves or particles.

An alpha particles is basically a helium nucleus and it contains 2 protons and 2 neutrons.

Symbol of an alpha particle is .

A beta particle is a particle with a negatively charged electron. Symbol of a beta particle is .

A gamma particle is basically a photon of electromagnetic radiation with a short wavelength.

Symbol of a gamma particle is .

Therefore, we can conclude that the definition of radiation and the different types of radioactive emissions are as follows.

  • Radiation is the process of emitting radiant energy in the form of waves or particles.
  • Alpha particle is two protons and two neutrons bound together into a particle identical to a helium nucleus.
  • Beta particle is a negatively charged electron emitted by the nucleus.
  • Gamma ray is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus.
HIGH SCHOOL

On Earth, the white colored paper represents areas that are A) covered with snow and reflect sunlight. B) heavily populated and use the sunlight. Eliminate C) covered with water and reflect sunlight. D) covered with concrete and absorb sunlight.

Answers

In an ecosystem model of earth , white colored paper represents areas that are covered with snow and reflect sunlight.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

Learn more about ecosystem,here:

brainly.com/question/13979184

#SPJ5

Option A, covered in snow.
COLLEGE

The bond between carbon and hydrogen is one of the most important types of bonds in chemistry. The length of an H—C bond is approximately 1.1 Å. Based on this distance and differences in electronegativity, do you expect the dipole moment of an individual H—C bond to be larger or smaller than that of an H—I bond?

Answers

Answer:

The dipole moment of H-C bond will be smaller than that of an H-I bond.

Explanation:

The electronegativity of iodine is greater than that of hydrogen.As a result the iodine atom tends to attract the bond electron pair of H-I bond towards itself creating a bond dipole which does not occur in case of H-C bond as the electronegativity of carbon and hydrogen are almost same.

   That"s why dipole moment of H-C bond is smaller than that of H-I bond.

MIDDLE SCHOOL

Why is the periodic table called the periodic table

Answers

The periodic table is called the periodic table because it repeats. All the elements on the periodic table are arranged by atomic number so the elements repeat. It’s almost like in school when you have switch classes they repeat as well. It’s very fascinating to see all these elements organized it the way that that they are.

The periodic table is named as such as it is split into groups with the same number of electrons in the outer shell. These groups can also be called periods which is where the table gets its name from.
MIDDLE SCHOOL

Which option is an example of a chemical property? A. density


B. toxicity


C. size


D. color

Answers

Answer:

B. Toxicity

Explanation:

Answer:

Heyoo!

The correct answer is B (Toxicity)

Explanation:

Hope this helps!!

HIGH SCHOOL

Which of the following shows a possible evolution of a cave formation? a.) soda straw > stalactite > column

b.) stalactite > soda straw > column

c.) soda straw > column > stalactite

d.) column > soda straw > stalactite

Answers

Answer:  The possible evolution of a cave formation is a.) soda straw > stalactite > column

Explanation:

The Soda straws represent the earliest growth of stalactites, these ones are known as tubular stalactites; they are hollow mineral cylindrical tubes that are formed of calcite.

When the hole at the bottom is blocked, or water begins flowing on the outside surface of Soda straws, then, a new formation is done, that is called Stalactite.

When a Stalactite joins to a Stalagmite, a new fomation is done, that is called Column.

The answer is column>soda straw>stalactite
MIDDLE SCHOOL

2.2 liters at 20 degrees Celsius if the pressure doesn’t change what is the new temperature at 2.6 liters

Answers

The temperature would be 21 degrees Celsius
MIDDLE SCHOOL

Match the element with its number of valence electrons. Match Term Definition: Helium Aluminum Fluorine Sodium A) 1 B) 2 C) 3 D) 7

Answers

Explanation:

Valence electrons are defined as the electrons that are present in the outermost shell of an atom.

  • Helium is the 2nd element of the periodic table having electronic configuration of

This element has 2 electrons in its outermost shell. So, it has 2 valence electrons. The correct answer is Option B.

  • Aluminium is the 13th element of the periodic table having electronic configuration of

This element has 3 electrons in its outermost shell. So, it has 3 valence electrons. The correct answer is Option C.

  • Fluorine is the 9th element of the periodic table having electronic configuration of

This element has 7 electrons in its outermost shell. So, it has 7 valence electrons. The correct answer is Option D.

  • Sodium is the 11th element of the periodic table having electronic configuration of

This element has 1 electron in its outermost shell. So, it has 1 valence electron. The correct answer is Option A.

Helium- 2

Aluminum- 3

Fluorine- 7

Sodium- 1

Hope I helped.

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