Describe how predation is good for overall health of an ecosystem

The most chemically reactive element among the listed elements is Radium (Ra). The correct option is C.  radium (Ra)

The elements listed are alkaline earth metals, that is, they belong to group 2 of the period table.

The reactivity of alkaline earth metals increases down the group. That is, the reactivity increases with increase in atomic mass.

Among the listed element, radium (Ra) has the greatest atomic mass and it is the last element as we go down the group.

Hence, the most chemically reactive element among the listed elements is Radium (Ra). The correct option is C.  radium (Ra)

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Answer: Nuclear fusion

Explanation:Nuclear fusion is the process by which two or more atomic nuclei join together to form a single heavier nucleus and large amounts of energy.

Answer:

1800V

Explanation:

Given parameters:

Power in the resistor  = 180W

Current  = 0.1A

Unknown:

Potential difference  = ?

Solution:

The power in a circuit is given as:

         P = I V

P is the power

I is the current

V is the potential difference

  Now insert the parameters and solve for V;

       180  = 0.1 x V

           V  = 1800V

Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. Solutions of HF are colourless, acidic and highly corrosive. It is used to make most fluorine-containing compounds; examples include the commonly used pharmaceutical antidepressant medication fluoxetine (Prozac) and the material PTFE (Teflon).

Answer:

500g because 300g is less dense than 500g its kinda like a weight

Explanation:

i

Answer:

In this chemical equation, there are two main elements. Those elements are magnesium (Mg) and oxygen (O). Molecules are a group of atoms bonded together, and in this case, the oxygen molecules is O2, but not 2MgO because there are two different molecules in this compound. Coefficients are a number that multiply an entire molecule, and are also placed in front of it. In this case, O2 has no coefficient, but a subscript of 2. But, every molecule in this equation must have a coefficient and if add a coefficient of 1 to the oxygen molecule, it does nothing to the overall balancing of equations.

So, the answer: coefficient to the oxygen molecule is 2.

Have a great day/night, stay safe, and merry christmas!

Answer:

2. The unit could be gram or kilogram ⇒ answer f

3. The larger unit is kilogram and measures weight (mass)

Step-by-step explanation:

Let us revise the SI units of measuring

The SI unit of measuring distance is meter

The SI unit of measuring volume is liter

The SI unit of measuring mass is kilogram

2.

When this pet hamster is placed on a digital scale, the  scale reads 1.5

∵ The SI unit of measuring weight (mass) is kilogram

∵ The scale reads 1.5

∴ The unit is kilogram

The unit could be gram or kilogram

3.

∵ The larger unit of measure is kilogram

∵ Kilogram measures the weight (mass)

∴ The unit measures weight (mass)

The larger unit is kilogram and measures weight (mass)

Explanation:

Answer:

i believe its d

Explanation:

Answer:

I checked and I too think its D

Answer:

Density = [tex]20\ g/cm^3[/tex]

Explanation:

Given that,

Mass of the object, m = 1000 g

Volume of the block, V = 50 cm³

We need to find the density of the object. Density is equal to mass per unit volume.

d = m/V

[tex]d=\dfrac{1000\ g}{50\ cm^3}\\\\=20\ g/cm^3[/tex]

So, the density of the object is [tex]20\ g/cm^3[/tex].

Answer:

because the gravity of the ball can't go that high

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, some energy is lost  to the environment as sound or heat.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. As the ball impacted the ground, the energy would have been lost to the environment as sound or heat.

Therefore, some energy is lost  to the environment as sound or heat.

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Answer:

Explanation:

Excess hci

Answer:

Switch is the 2 circles

battery is the 2 lines

bulb is the x-men sign

Explanation:

Answer:

hope it helped you

have a nice day

Answer:

3 times ....

group 2

Explanation:

Answer:

3.3 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

120 g HCl

Step 2: Identify Conversions

Molar Mass of HCl - 36.5 g/mol

Step 3: Convert

[tex]120 \ g \ HCl(\frac{1 \ mol \ HCl}{36.5 \ g \ HCl} )[/tex] = 3.28767 mol HCl

Step 4: Check

We are given 2 sig figs as our lowest. Follow sig fig rules and round.

3.28767 mol HCl ≈ 3.3 mol HCl

Answer:

im not sure man

Explanation:

Answer:

CH3O

C6H18O6

Explanation:

Porcentaje de masa de oxígeno = 100% - (33,002% + 9,063%) = 57,935%

Divida el porcentaje en masa de cada elemento por su masa atómica relativa;

H- 9.063 / 1, C- 33.002 / 12, O - 57.935 / 16

H- 9.063, C- 2.75, O- 3.62

Dividir por la proporción más baja;

H-9.063 / 2.75, C- 2.75 / 2.75, O- 3.62 / 2.75

H- 3, C-1, O- 1

Fórmula emperical = CH3O

Dado que la masa molecular es 191 g / mol

Sea n el número de cada átomo de la molécula

Por tanto, su fórmula molecular es; (CH3O) n = 191

[12 + 3 (1) + 16] n = 191

31n = 191

n = 191/31

n = 6

Por lo tanto, la fórmula molecular del compuesto es; (CH3O) 6 que es C6H18O6

Answer:

3

Explanation:

I think so, let me know if its wrong.

Answer:

105%

Explanation:

El porcentaje de rendimiento se define como la masa obtenida del producto (En este caso, en términos de H2CO3), dividida en la masa teórica que debe ser producida.

La masa real se obtiene con las moles del otro producto que fueron producidas (Que son las mismas moles producidas de H2CO3)

Y la masa teórica se obtiene a partir de las moles de reactivo adicionadas:

Masa teórica:

2.36g NaHCO3 * (1mol / 84g) = 0.0281 moles de NaHCO3

0.0281 moles de NaHCO3 * (1mol H2CO3 / 2 moles NaHCO3) =

0.014 moles de H2CO3 son producidas. La masa es:

0.014 moles de H2CO3 * (62g / mol) = 0.871g es la masa teórica

Masa real:

1.57g Na2CO3 * (1mol / 106g) = 0.014 moles de Na2CO3

0.0148 moles de Na2CO3 * (1mol H2CO3 / 1 moles Na2CO3) =

0.0148 moles de H2CO3 son producidas. La masa es:

0.0148 moles de H2CO3 * (62g / mol) = 0.918g es la masa real producida

Así, el porcentaje de rendimiento es:

0.918g / 0.871g * 100 =

105%

Number of electrons in a Ca²⁺ = 18

In an atom there are levels of energy in the shell and sub shell  

This energy level is expressed in the form of electron configurations.  

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is  

• s: 2 electrons  

• p: 6 electrons  

• d: 10 electrons and  

• f: 14 electrons  

Charging electrons in the sub shell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20

Electron configuration of Ca : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²

When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:

[tex]\tt 20-2 = 18[/tex]

and the electron configuration (Ca²⁺ ) becomes:

1s², 2s², 2p⁶, 3s², 3p⁶

Answer: The universe consists of all physical objects on earth in space

Explanation:

Answer: 1, magnesium & mg

2, two energy shells

Explanation:

Answer:

Semiconductor

Explanation:

Semiconductors conduct electricity as the temperatures increase.

Hope this helped.

Answer:

Explanation:

__________________________________________________________

Mean = 14.2 or 14

Median = 14

Mode = 16

Range = 6

__________________________________________________________

Here are all the numbers from least to greatest order: 11, 12, 13, 13, 14, 14, 16, 16, 16, 17.

__________________________________________________________

Hope this helps! <3

__________________________________________________________

The answer is 2

2H2 + O2 ---> 2H2O

Answer:

High mass star.

Explanation:

The mass of a star defines its life span. the least massive stars will live the longest and the most massive stars will use their fuel in a few million years and end in a spectacular supernova.