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Answer:C

Explanation:

Because they use it so that they can find more information about it.

What scientists use to describe a constellation: C. It’s star pattern

A star is a giant astronomical or celestial object that comprises a luminous sphere of plasma and bounded together by its own gravitational force.

Generally, a star is typically made up of two (2) main hot gas and these are Hydrogen (H) and Helium (He).  Some examples of a star are;  

A galaxy can be defined as a collection (group) of many billions of stars, which are existing independently. Thus, the greatest number of stars are found in a galaxy.

A constellation can be defined as a collection (group) of visible stars forming a recognizable or perceived pattern in the sky. Also, this pattern or outline is sometimes attributed by scientists to a mythological figure.

In conclusion, scientists use the pattern of a star to describe a constellation.

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Answer:

a

Explanation:

because look at the pic of the flower

Answer:

a

Explanation:

Answer:

M=3

B=25

Equation= 3x+25

Explanation:

M is your slope and if you follow the slope- intercept formula (y=m+b) you just need to plug in the numbers.

Thus your answer:

M=3

B=25

Equation= 3x+25

Answer:

When you combine the solid (baking soda) and the liquid (vinegar), the chemical reaction creates a gas called carbon dioxide. Carbon dioxide is invisible, except as the bubbles of gas you may have noticed when the vinegar and baking soda mixture began to fizz.

Explanation:

Answer:

16

Explanation:

hope you like the answer

Answer:

i believe its gas sorry if i am wrong

Explanation:

Answer:

The cannonball model

Explanation:

Hope this helped!! :)

Answer:

NaCI + O2= NaCIO3 I think

Answer:

The kinetic energy of the molecules  

increases

.

The speed of the molecules  

increases

.

The density of the fluid  

decreases

.

The fluid  

rises

.

Explanation:

this is correct on edge

When the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.

In conclusion, when the temperature of a fluid increases, then the kinetic energy of the molecules INCREASES, the speed of the molecules INCREASES, the density of the fluid DECREASES, and the fluid RISES.

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Answer:

two hydrogen atoms

In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.

Can i get brainlisted please

Answer:

two hydrogen atoms.

Explanation:

the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms.

hope it helps : )

Answer:

. Increasing the volume of the container

Explanation:

Answer:

28.8km/h

Explanation:

Change the 5min to hours.

=5/60 =0.0833hrs

Velocity= Distance /Time

2.4/0.0833

=28.8km/h

Answer:

The ionic compound NaCl has a Face Centered Cubic unit cell

The site for atoms are Face, center and Edges corner.

Effective number of atoms

Na+

1centers + 12edges x[tex]\frac{1}{4}[/tex] = 4 Na+  

Cl-

6face x[tex]\frac{1}{2}[/tex]  + [tex]\frac{1}{8}[/tex] x8 corners = 4Cl-

This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.

Answer:

the concentration of hydrochloric acid

the temperature in heating

Answer:

The more reactive the metal, the more rapid the reaction is. A metal below hydrogen in the reactivity series will not react with dilute acids.

Explanation:

Answer:

Explanation:

Usually when an acid reacts with metal, salt and hydrogen are produced. Acid + metal = salt + hydrogen. Example calcium nitrate + hydrogen. Hope this helps

Answer:

a carbonyl group

Explanation:

Functional group can be interconverted into each there by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. The correct option is option D that is  amine group.

A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry. Functional group determine the property of a compound.

The list of functional group are as follow:

Carboxylic group COOH

Alcoholic group OH

Ammine group R-NH₂

Ketonic group R-CO_R

Aldehydic group R-CHO

Thiol group R-S-H

Cyanide group -CN

The given image represent amine group.

Therefore the correct option is option D that is  amine group.

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Answer:

4NO2 + 2Na2O + O2 → 4NaNO3

Answer:

Positive

Explanation:

For the most effective hot pack, the temperature change should be positive.

Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.

This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.

Answer:

10460J

Explanation:

Given parameters:

Mass of water sample  = 100g

Initial temperature = 35°C

Final temperature  = 60°C

Unknown:

Amount of energy absorbed by water = ?

Solution:

The amount of energy absorbed by water is mathematically expressed below;

    H  = m C ΔT

H is the amount of energy

m is the mass

C is the specific heat capacity of water  = 4.184J/g°C

ΔT  = 60°C  - 35°C  = 25°C

 Now insert the parameters and solve;

 H = 100 x 4.184 x 25  = 10460J

Answer: The chemical formulas of calcium and magnesium chloride are [tex]CaCl_2[/tex] and [tex]MgCl_2[/tex]

Explanation:

A chemical formula is the representation of a substance in terms of chemical symbols showing the elements present in a compound and their relative proportion.

Calcium is having an atomic number of 20 has electronic configuration of [tex]1s^22s^22p^63s^23p^64s^2[/tex]. It can lose two electrons to have an oxidation state of +2.

Magnesium is having an atomic number of 12 has electronic configuration of [tex]1s^22s^22p^63s^2[/tex]. It can lose two electrons to have an oxidation state of +2.

Chlorine is having an atomic number of 17 has electronic configuration of [tex]1s^22s^22p^63s^23p^5[/tex]. It can gain one electron to have an oxidation state of -1.

Thus the chemical formulas of calcium and magnesium chloride are [tex]CaCl_2[/tex] and [tex]MgCl_2[/tex]

Answer:

Kinetic energy to Electrical energy.

Explanation:

When stationary bike is pedaled the wheels of the bike rotates which is a form of kinetic energy, this kinetic energy can be converted into electricity when connected to a generator.

From _Kinetic_ energy to _Electrical_ energy.

Answer:

Answer

Explanation:

The chloroplast. Animal cells DO NOT make their own food, while chloroplasts are needed in the plant cell to carry out photosynthesis.

Answer:

A Mitochondria is the power house of the cell, So it's not A.

vacuole is the water storage, So it's not B.

the lysosomes remove Waste, Cellular Debris, and foreign particles, So it's not C.

It's D chloroplast create food for the cell .

(Hope this helps :) )

Explanation:

Answer:

phosphorous gain electron to form ions

Explanation:

Answer:

I think because Moving an object against a stronger magnetic force transfers more energy to the magnetic field. Magnetic forces

are stronger closer to magnets. The Wednesday test launch stored more potential energy, and launched the

spacecraft at a faster speed because the stronger magnetic field closer to the magnet resulted in a greater

increase in potential energy.  

Explanation:

Potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.

Reactivity of elements refers to the ability of atoms of elements to gain or lose electrons in order to form bonds with other elements.

The most reactive elements are those of group 1, 2 and 7.

Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is potassium.

They are very reactive as well and lose their two valence electrons easily to forms ions. Because of their reactivity, they do not occur free in nature but in combined forma with other elements. Example is calcium.

Therefore, potassium and calcium are rarely found as pure elements in nature but are usually combined with other substances because of their high reactivity.

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