Which of the following distinguishes an element from all other elements?
Its number of protons.
O
Its color in solid form.
o
Its phase at room temperature.
Its group in the Periodic Table.
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Answer:

9.62 × 10² J

Explanation:

In this problem, we need to convert 230 calories to joules. For this, we must know the conversion from calories to joules.

1 Calorie = 4.184 Joules

To find Joules in 230 calories, multiply 4.184 by 23. So,

230 Calorie = (230 × 4.184) Joules

= 962.32 Joules

or

230 Calories = 9.62 × 10² J

So, the correct option is (A).

Answer:

heat is added making it a chemical change

Explanation:

Answer:

With pancakes, the chemical reaction is between a leavening agent – such as baking soda & baking powder – & an acidic ingredient – such as buttermilk – producing tiny bubbles of carbon dioxide gas. These bubble form throughout the pancake, and are trapped as the batter cooks and solidifies

Explanation:

since there is a chemical reaction the pancakes cant be changed back into the ingredients after done.

Each atom/element has an electron configuration

The electron configuration shows the energy level of the electron

Each electron configuration has 4 quantum numbers, namely n, l, ml, and ms

We make an example of the element Mg which is in group 2 with the atomic number 12

Electron configuration of Mg: [Ne] 3s² or 1s² 2s² 2p⁶ 3s²

if Mg removes 2 electrons then Mg will form a positive ion (cation) Mg²⁺

This cation is included in the monatomic ion because it is formed from one element (in contrast to the polyatomic ion, which is formed from two or more elements such as SO₄²⁻, ClO₃⁻)

Electron configuration of Mg²⁺ : 1s² 2s² 2p⁶

So atoms can be positively or negatively charged depending on removing or attracting electrons

Answer:

The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law). Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecules

Explanation:

Answer:

false

Explanation:

According to the laws of reflection, the speed of light is slowed down by denser media, hence the statement is false.

Reflection of light is defined as a property of light ray that when it strikes a smooth surface it bounces back .Objects can be seen due to this property of light.Reflection is produced by all types of waves namely sound waves, light waves, electromagnetic waves.

Reflection of light is governed by laws of reflection which are also called as Snell's laws. According to laws of reflection, angle of incidence and angle of reflection are equal.The incident ray , reflected ray and normal all lie on the same side of the plane.Light travels in a straight line before, after and during the process of reflection.There are 3 types of reflection which are diffuse reflection,specular reflection and glossy reflection.

Learn more about reflection,here:

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Answer: False

Explanation:

Answer:

Shape?

Explanation:

that's the only thing that would make sense

Answer:

Shape  

is the answer

Answer:

it is a compound it is a solution when they say they are ablle to seperate it give out they did not mix it

Explanation:

Answer:

an ice cube and paper cube with the same dimensions

Explanation:

an example is an ice cube and a cube with the same dimensions made of paper. these have the same volume, but different masses because the particles are packed differently and in different amounts.

Answer:

melting

Explanation:

Answer: You can use Boyle's law, which states that pressure is inversely related to volume when other variables are held constant. If the final pressure of a gas is half of the initial, the volume must double if temperature is to remain the same.

Explanation:

The oil slick thick = 1.256 x 10⁻⁴ cm

Volume is a derivative quantity derived from the length of the principal

The unit of volume can be expressed in liters or milliliters or cubic meters

The conversion is

1 cc = 1 cm3

1 dm = 1 Liter

1 L = 1.06 quart

so for 1 quart = 0.943 L

[tex]\tt 0.943~L=0.943\times 10^{-3}m^3[/tex]

Volume of oil dumped = volume of swimming pool

[tex]\tt 0.943\times 10^{-3}~m^3=25\times 30\times h(h=thick)\\\\h=\dfrac{0.943\times 10^{-3}}{750~m^2}=1.257\times 10^{-6}~m=\boxed{\bold{1.256\times 10^{-4}~cm}}[/tex]

Answer:

The mass number of an isotope is the total number of protons and neutrons in an atomic nucleus. If you know that a nucleus has 6 protons and 6 neutrons, then its mass number is 12. If the nucleus has 6 protons and 7 neutrons, then its mass number is 13.

Explanation:

Answer:

They are found the same way but use different symbols when found.

Explanation:

A supercontinent is a landmass that consists of an aggregate mass of entire earth lithospheric landmasses. Pangaea was the last supercontinent that split about 200 million years ago.

Hence the option C is correct.  

Learn more about the not an example of evidence of a supercontinent.

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Answer:

it mean i cumed

Explanation:

Answer:

with out answer choices i will assume dendrites

Explanation:

Answer: if your quiz has these options to choose from - A: baking a cake B: grinding pepper C: lighting up a grill D: toasting bread, then it would be B: grinding pepper

Explanation: i took a quiz that had this question and i got it correct

Physical change of a substance include the phase change of the substance. Melting is an example of physical change where, a solid melts to form its liquid.

The change in state or phase of a substance is called physical change such as, melting, boiling, crystallization etc. Whereas, the change that involves bond making or bond breaking is called a chemical change.

Nuclear decay is an example of chemical change a heavy unstable atom breaks into two stable nuclei by emitting certain radiation. Forming or breaking of chemical bonds are chemical changes.

Melting of a substances is its change from solid to liquid state. At this temperature, the solid state and liquid state of a substance comes in equilibrium.

This process does not involve any bond making or breaking hence, it is a physical change. Therefore, D is correct.

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Your question is incomplete. But your complete question probably was:

which option is an example of a physical change??

A breaking chemical bonds

B forming chemical bonds

C nuclear decay

D melting a substance

1. What is the chemical formula for the limiting reactant in the reaction shown?

Answer: NO

2. Write the balanced chemical equation for the reaction, using lowest whole-number coefficients.

Answer: 2NO + 2H2 —-> 2H2O + N2

Taking into account the definition of limiting reagent and balanced reaction, you get:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

The reagent in excess will be the one that is not completely exhausted during the reaction, that is, they are those that are partially consumed, "excess" amount of that reagent. This is because the amount of product obtained from the reaction will always depend on the amount of limiting reagent in the reaction.

In this case, you can see that you have two reactants: NO and H₂. Having 4 moles of NO and 5 moles of H₂, you can see that no moles of NO are present in the products, but there is 1 mole of H₂.

This indicates that NO is the limiting reagent, since it is completely consumed, while there is 1 mole of H₂ in excess.

In summary, NO is the limiting reagent.

Taking into account that the reagents are in stoichiometric proportions when the reagents are combined with each other without any of them,  you can observe that the chemical equation is:

4 NO +  4 H₂ → 4 H₂O + 2 N₂

Dividing by 2 to get the lowest whole-number coefficients, the balanced chemical reaction is:

2 NO +  2 H₂ → 2 H₂O + 1 N₂

Learn more:

Answer:

inner core

Explanation:

Answer:

The outer core.

Explanation:

There is liquid metal, like iron, which creates electric currents going through the ground. When the Earth rotates on it's axis, it creates a magnetic field.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass of metal = 300 g

density = 7.13 g/mL

We have

[tex]volume = \frac{300}{7.13} \\ = 42.07573632...[/tex]

We have the final answer as

Hope this helps you

Answer:

Energia solar: é proveniente de uma fonte inesgotável: o Sol. Os painéis solares possuem células fotoelétricas que transformam a energia proveniente dos raios solares em energia elétrica. Tem a vantagem de não produzir danos ao meio ambiente.

Energia nuclear: energia térmica transformada em energia elétrica, é produzida nas usinas nucleares por meio de processos físico-químicos.

Energia eólica (ar em movimento): ela já foi utilizada para produzir energia mecânica nos moinhos. Atualmente é usada com o auxílio de turbinas, para produzir energia elétrica. É atraente por não causar danos ambientais e ter custo de produção baixo em relação a outras fontes alternativas de energia.

A energia elétrica também pode se transformar em outros tipos de energia ao chegar às residências ou em indústrias. Exemplos:

Energia térmica: quando vamos passar roupas, a energia elétrica é transformada em energia térmica através do ferro de passar.

Energia sonora e energia luminosa: recebemos iluminação em casa pela transformação da energia elétrica que, ao passar por uma lâmpada, torna-se incandescente, e o televisor nos permite receber a energia sonora.

Energia mecânica: usada nas indústrias automobilísticas para trabalhos pesados.

Answer:

position, speed and acceleration

Answer:

I don't no sorry. ਕਿਉੁਂਕਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ 478figxigxurRyyv ਸ੍

Answer:

3.2-2.5 = 0.7 pretty small difference

Explanation:

im his bruda