Can somebody plz help answer this science questions (only 1-2 sentences is good thx !

WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST!…promise :D

Answer:

Magnesium has valency equal to 2 +

Explanation:

because the electronic configuration of Mg is [2,8,2]. The nearest noble gas to magnesium is neon with electronic configuration of [2,8], to achieve this stable electronic configuration Mg can lose 2 valence electrons, hence its valency is 2 + .

Answer:looks for it

Explanation:

Answer:

Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid).

Explanation:

Your welcome

Answer:

Number of moles = 0.51 mol

Explanation:

Given data:

Mass of CO₂ = 22.4 g

Number of moles = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Molar mass of CO₂ = 44 g/mol

by putting values,

Number of moles = 22.4 g/ 44 g/mol

Number of moles = 0.51 mol

The type of wave is shown in the image is transverse wave and the correct option is option B.

A transverse wave is a wave in which particles of the medium vibrate at right angles, or perpendicular, to the direction that the wave travels.

Transverse waves commonly occur in elastic solids, oscillations, in this case, are the displacement of solid particles from their relaxed position, in the direction perpendicular to the propagation of the wave.

Transverse waves can travel through empty space as electromagnetic waves or be mechanical waves.

Therefore, The type of wave is shown in the image is transverse wave and the correct option is option B.

Learn more about Transverse waves, here:

https://brainly.com/question/13863548

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The law of conservation of mass is directly represented in a balanced chemical equation.

In chemistry, the law of conservation of mass says that in a closed or isolated system, matter cannot be created or destroyed in a chemical reaction.

For example: If we burn wood, the mass of ashes and gases is equal to the mass of wood before burning.

Thus, the Law of conservation of mass represent a balanced chemical equation.

Learn more about, law of conservation of mass, here:

https://brainly.com/question/13383562

Answer:

Shift it to the left toward the reactants

Explanation:

The direction of movement of a reaction at equilibrium has been explained by a man called HENRY LOUIS in his principle. According to this principle, a reaction will shift in response to a stress on equilibrium. The stress can either be effects of temperature, pressure, concentration etc on the reaction equilibrium.

- An addition of a reactant or product will cause the reaction to shift towards the opposite direction of the substance added. For example, in this question, the following reaction was given:

A + B ----> C + D

C is a product, meaning that if more of product C were added to this reaction, the reaction will shift towards the left (reactant side) because there are now more products. In other words, the reactants will be favored if there is an increase in the concentration of the products.

Answer:

hi

Explanation:

hi

Answer:

a very high melting point answer

Answer:

2.8J

Explanation:

Given parameters:

Specific heat capacity  = 0.129J/g°C

Mass  = 0.7g

Initial temperature  = 53°C

Final temperature  = 22°C

Unknown:

Quantity of heat released  = ?

Solution:

To solve this problem, we use the expression below;

       H  = m c Ф

 H is the quantity of heat released

m is the mass

 c is the specific heat capacity

  Ф is the change in temperature

Now,

  Insert the given parameters and solve;

  H  = 0.7 x 0.129 x (22  - 53)  = -2.8J

The amount of heat released is 2.8J, the negative depicts the heat released.

Answer:

a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

Explanation:

Answer:

Antioxidants such as vitamin C are preservatives by inhibiting the degradation of food by oxygen. Bulking agents such as starch are additives that increase the bulk of a food without affecting its taste.

Answer:

it is a replacement reaction

Answer:

Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. Because opposite electric charges attract each other, negative electrons are attracted to the positive nucleus

Answer:

salt water heterogeneous mixture , pure substance compound,element solut8on

Answer:

i no now dethankyou

Explanation:

Answer:

Ok 15 miles NO2 you need the salt and pepper trick so mix it add water sit in it when you get cold write down uh temperature then you need to get out or it may kill you when it starts to get cold then go to the y- axis then you need to ask your teacher for help after you do the y-axis

Answer:

Metamorphic rocks can also be formed in ocean floors.

Explanation:

The ocean floor is made up predominantly of basalts and are derived by the cooling an solidification of magma in this environment.

Answer: a is incorct

Explanation:

Answer:

false

Explanation:

Because volume is in m3

Answer:

False

Correct answer: 3.75m³

Explanation:

Given parameters:

  Height of box  = 1m

  Length of box  = 2.5m

  Width of box  = 1.5m

Unknown:

Volume of the box  = ?

Solution:

The volume of the box is given as:

   Volume  = length  x height x width

 Volume  = 2.5 x 1 x 1.5

 Volume  = 3.75m³

Answer:

unit formula??

Explanation:

Answer:

made to fit a specific function

Answer:

waste energy = 30 J

Explanation:

Given that.

Input energy = 100 J

Useful energy = 70 J

We need to find the amount of waste energy.

Waste energy = total energy - used energy

= 100 J - 70 J

= 30 J

Hence, 30 J of energy is waste energy.

The empirical formula and the molecular formula are the same : C₁₇H₁₉NO₃

Given

3.22 g of carbon, 0.300 g of hydrogen, 0.221 g of nitrogen, and the rest is oxygen.

Required

The empirical formula and then the molecular formula.

Solution

Mass of Oxygen = 4.5 - (3.22+0.3+0.221)=0.759 g

Mol ratio of elements C : H : N : O =

3.22/12 : 0.3/1 : 0.221/14 : 0.759/16 = 0.268 : 0.3 : 0.016 : 0.047

Divide by 0.016 :

16.75 : 18.75 : 1 : 2.9375 = 17 : 19 : 1 : 3

(C₁₇H₁₉NO₃)n = 285

(12.17+19+14+3.16)n = 285

(285)n = 285

n = 1

Then the empirical formula and the molecular formula are the same