feeling generous today thank you guys so much

Answer:

A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.

Answer:

What is it has fixed boiling point substance or mixture? A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.

Explanation:

lol they got it from go ogle

Answer:

The answer is 2.

Explanation:

Answer:

Explanation:

Whether the electrons are added or given away makes no difference to the name given to parent atom -- It is called an ion which means that it has a charge. The word atom is reserved for something on the periodic table that has no charge.

Answer: Chemical bond formed when one or more electrons are transferred from one atom to another.

Explanation: Give me the brainiest

Answer:

B.Magnesium(Mg)

Explanation:

maybe

Measles is a communicable disease that requires immunization to prevent illness when exposed to it.

Measles is a communicable disease and highly contagious. It  is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.

It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.

The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.

Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.

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Answer:

The correct anwser would be C

Explanation:

Answer:

The answer is C. Is the source an authority on the subject?

Explanation:

Answer:

Water :H2O

Carbon dioxide :CO2

Oxygen :O2

Glocuse :C6H12O6

Answer:

water = H20

carbon dioxide = CO2

oxygen = 02

glucose= C6H1206

Explanation:

Answer:

The required mass to prepare 2.5 L of 1.0 M NaOH solution is 100 g

Explanation:

We do this by preparing the equation:

Mass = concentration (mol/L) x volume (L) x Molar mass

Mass = 1.0 M x 2.5 L x 40 g/mol

Mass = 100 g

Answer:

[tex]100\; \rm g[/tex] of [tex]{\rm NaOH}\; (s)[/tex] would be required.

Explanation:

The quantity of solute in a solution of concentration [tex]c[/tex] and volume [tex]V[/tex] would be [tex]n = c \cdot V[/tex].

It is given that volume [tex]V = 2.5\; \rm L[/tex] for the solution in this question. It is also given that the concentration of the [tex]\rm NaOH[/tex] solute in this solution is [tex]c = 1.0\; \rm M[/tex], which is the equivalent to [tex]c = 1.0\; \rm mol \cdot L^{-1}[/tex].  

Apply the equation [tex]n = c \cdot V[/tex] to find the quantity of [tex]\rm NaOH[/tex] in this solution:

[tex]\begin{aligned}n &= c \cdot V \\ &= 1.0\; \rm mol \cdot L^{-1} \times 2.5\; \rm L \\ &= 2.5\; \rm mol\end{aligned}[/tex].

Multiply the quantity [tex]n[/tex] of [tex]\rm NaOH[/tex] in this solution with the formula mass [tex]M[/tex] of [tex]{\rm NaOH}\![/tex] to find the corresponding mass:

[tex]\begin{aligned}m &= n \cdot M \\ &= 2.5\; \rm mol \times 40\; \rm g \cdot mol^{-1} \\ &= 100\; \rm g\end{aligned}[/tex].

Thus, this solution would contain [tex]100\; \rm g[/tex] of [tex]{\rm NaOH}[/tex].

It would thus take [tex]100\; \rm g[/tex] of [tex]{\rm NaOH}[/tex] to prepare this solution.

A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone in minutes molecules are 9.03 × 10 ²³ molecules.

Moles are the smallest unit of a molecule that participates in the formation of the molecules to compete in a reaction and the value will be equal to the Avogadro number 2.303 × 10 ²³.

To calculate the total number of molecules the value of one mole is 2.303 × 10 ²³. so, for 1.50 moles of hydrofluoric acid will be,

                         1.50 moles = 2.303 × 10 ²³.moles

                  hydrofluoric acid molecules = 1.50 × 2.303 × 10 ²³

                    hydrofluoric acid molecules = 9.03 × 10 ²³ molecules.

Therefore,  9.03 × 10 ²³ molecules are present in the container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone.

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Answer:

A

Explanation:

Because it milliliter and litre is used to measure volume not meter or millimeter

Answer:

it is placed over a bunsen burner to heat up and remove all bacteria

Explanation:

Answer:

I believe it's because it's based on gravity

Explanation:

mass is like your true weight while weight is your mass and some equation with gravity. it's been a few years

Answer:

You can but because it is almost 1500 lightyears away it appears blurry and somewhat hard to find. So the answer to your question is yes but not with the naked eye. You need a telescope lens to see it as more than a blurry spot in the sky.

Explanation:

Answer:

electrons are fermions, they can only access an energy level if it has not already been occupied by another electron. Thanks to this principle, there is a minimum energy level within the atom and it is not possible for an electron to collapse to the nucleus because it cannot exceed this} threshold.

Explanation:

I hope I have helped you.

Answer:

the 1st one

Explanation:

Answer:

 A FLUORINE

Explanation:

Explanation:

Option A, Fluorine is the correct answer, because it has 9 electrons in its shells.

hope this helps you.

B

Hope this helped you, have a good day bro cya)

Answer: Although metamorphic rocks typically form deep in the planet's crust, they are often exposed on the surface of the Earth.

Explanation:

Answer:

Answer:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties.

Explanation:

Answer:

a and b

Explanation:

Answer:

The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants

A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda  carbon-dioxide gas is released.

The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.

Explanation:

Chemical change is defined as those change in which arrangement of atoms present in the substance changes and leads to formation of new substance.

The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants

A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda  carbon-dioxide gas is released.

[tex]CH_{3} COOH+ NaHCO_3[/tex]→[tex]CO_2+H_2O+CH_3COONa[/tex]

The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.

[tex]Cu+O_2+CO_2+H_2O[/tex]→[tex]Cu_2(OH)_2CO_3[/tex]

Physical change is defined as those changes which leads to change in shape, size or state of the substance changes. No new substance is formed.

When there are lone pairs on the valence shell of the central atom in a molecule, the bond angle is decreased.

The shape of molecules depend on the number of electron pairs on the valence shell of the molecules. These electron pairs could be lone pairs or bond pairs. Lone pairs occupy more space around the central atom since it is attracted to only one nucleus compared to bond pairs which are attracted to two nuclei.

When lone pairs are present on the central atom in a molecule, they tend to "squeeze" the molecule thereby decreasing the bond angle in the molecule. Hence, presence of one or more lone pairs of electrons make the bond angles get smaller.

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Answer:

b

Explanation:

Answer:

force or velocity

Explanation:

I am not sure

Answer:

A positive charge in the balloon attracts the negative charges in the wall

Explanation:

The question states attract, so we know it's not going to be option C.

The wall clearly doesn't change shape, so that eliminates option B as well.

The balloon gets positively charged, and so for an attractive force to appear, you need the opposite charge from the wall, i.e. negative.

Remember: opposite charges attract

Which means, the only option that makes sense is Option D.

P.S.: You could've concluded it's option D just because it's the only one that contains the word "attract" in there!

Hope I helped! :)

Answer:

a positive charge in the ballon attract the negative charge of the wall

Explanation:

Answer:

the "goldilocks zone" is the habitable zone around a star where it's not too hot and not too cold, so liquid water and life can exist on the planets in this zone.

Explanation:

The distance Earth orbits the Sun is just right for water to remain a liquid and for life to not be frozen or fried. This distance from the Sun is called the habitable zone, or the Goldilocks zone.

Answer:

communicate the important work you have done in lab

Explanation:

Answer:1, 2, and 4

Explanation:

covalent bonds are not ionic.  the elements SHARE electrons

Which of the following are properties of compounds formed by covalent bonding (Select all that apply)  

1. When you dissolve an covalent compound in water, the solution does not conduct electricity.

2. Covalent compounds often have lower melting points than ionic compounds.

3. When you dissolve an covalent compound in water, the solution conducts electricity.

4. Covalent compounds form when combining two or more nonmetal atoms.

5. Covalent compounds form when combining a two metal atoms.

6. Covalent compounds form when combining a metal atom with a nonmetal atom.

The properties of covalent compounds are option 2, 3 and 4. Covalent bonds are weaker than ionic bonds.

Covalent bonds are formed by sharing electrons between two atoms. Non metals with comparable electronegativities forms covalent bonds. They are weaker than ionic bond. Thus have lower melting point.

Melting point depends on the bond strength that's why covalent compounds have lower melting point compared with ionic bonds.

Polar covalent bonds can conduct electricity when dissolved in water because of the presence of free electrons. Thus option 3 is correct.

Hence, the properties in option 2, 3 and 4 are correct for covalent compounds.

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Answer:

The answer would be the hawk.

Explanation:

First-order consumers directly depends on grass or plants for survival.

A hawk gets its food from eating animals.

Again, hope this helps :D