Need help with #1 and #2

Answer:

I remember doing this in 7th,

1. D

2. B or D, more leaning on B though

3. A

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:

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:

the 1st one

Explanation:

The formula equation is more meaningful than a word equation because the word equation only defines what the reactants and products are, whereas the formula equation defines which and how much of each element is present in the chemicals and also give some indication as to their structure.

Answer:

The formula equation is more meaningful than a word equation because the word equation only defines what the reactants and products are, whereas the formula equation defines which and how much of each element is present in the chemicals and also give some indication as to their structure

Explanation:

The formula equation is more meaningful than a word equation because the word equation only defines what the reactants and products are, whereas the formula equation defines which and how much of each element is present in the chemicals and also give some indication as to their structure

Answer:

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: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 "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.

The characteristics of the Bohr model allow you to find that the correct answer for the distribution of particles in the atom is:

   b) Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.

The bohr model was initially developed for hydrogen, where it manages to fully explain the spectrum of the hydrogen atom, it was quickly spread to other multi-electronic atoms with the characteristic of having a single electron in their last orbit.

The extension to atoms with more than one electron in the last shell the model results are not completely correct.

The Bohr model uses Rutherford's knowledge that the atomic nucleus is a very small part of an atom that contains all its mass, that is, it contains the protons and neutrons and the electrons are in circular orbits around the nucleus.

In the case presented of Neon, its electronic configuration is

    1s² 2s² 2p⁶

Let's examine the different claims:

a) False. Protons and neutrons form the mass of the atom, therefore they are both in the nucleus.

b) True. The protons are in the nucleus and the electrons are in circular orbits.

c) False. All protons and neutrons must be in the nucleus, plus neon only has 10 neutrons.

c) False. The number of protons determines the type of atom. An atom with twenty protons is Calcium atom .

In conclusion, using the characteristics of the Bohr model we can find that the correct answer for the distribution of particles in the atom is:

  b) Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.

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Answer:

chemical stability is important to consider in the comprehensive assessment of pharmaceutical properties, activity, and selectivity during drug discovery.

Answer:

In general, molecules are stable because all their constituent atoms have sufficient "valence" electrons-that is, electrons that participate in chemical bonding. Such electrons reside in the outer, or valence, "shell," which must fill up with the appropriate number of electrons for the bound atoms to be come stable.

Explanation:

Answer:

pressure doubles

Explanation:

they are inversly preportional

Answer:

B.Magnesium(Mg)

Explanation:

maybe

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:

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:

Explanation:

here is the answer attached

Answer:

argan can exist freely in nature because it has stable configuration whereas sodium atom cannot exist freely nature because do not have stable configuration.

Explanation:

brainiest!!!!!

Because that's the correct answer

Answer:

communicate the important work you have done in lab

Explanation:

Answer:

A

Explanation:

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

Answer:

The correct anwser would be C

Explanation:

Answer:

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

Explanation:

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: both are mixtures , Brainliest please

Explanation:

Answer:

C) is the correct answer

Gas

Gas particles got the most energy because of how freely the molecules move

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

The correct answer is Option (C) An unbalanced force moving everyone in Daniel and Maria's direction.

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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.

Answer:

Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water s hydrogen bonds.Water will not do this so the oil is forced to stay separate from the water.

Oil are the lipid molecule do not Mix With Water Because of Polarity. Oil and water don’t mix as it  is made up of non-polar molecules while water molecules are polar.

Lipids are organic biomolecule made up of carbon, hydrogen and oxygen with some other elements like phosphorus and nitrogen may be present.

A fatty acid which is an organic acid having hydrogen and general formula R-COOH where R represents hydrogen or a group of carbon and hydrogen atoms, for example stearic, palmitic and oleic acids.

Glycerol is another component which is a thick sweetish liquid, soluble in water and  can react with a fatty acid. where one molecule of glycerol combines with three molecule is fatty acids by formation of a bond called ester, here ester is also known as triglyceride.

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Answer:

Water :H2O

Carbon dioxide :CO2

Oxygen :O2

Glocuse :C6H12O6

Answer:

water = H20

carbon dioxide = CO2

oxygen = 02

glucose= C6H1206

Explanation: