are magnesium and calcium more reactive with oxygen in the air than aluminum?

Answer:

At high temperature and pressure, reactions become faster

Explanation:

Collision theory or reaction particle model state that reacting particles must collide before reactions occur.

Reaction rate of reaction is dependent on the frequency of collision.

Kinetics of gases increases at higher temperature and pressure.

As the temperature and pressure of nitrogen and oxygen increased, they bound to move more faster, collide more frequently as to attain activation energy easily thereby increasing the reaction rate or making the reaction to complete faster.

Also at higher pressure, gaseous reactants are closer to each other.

Answer:

in a solid particles or still but as it gets hot the particles will move around rapidly

As a solid heats to its boiling point, it undergoes phase changes from solid to liquid to gas. At each stage, the particles' movement changes from fixed vibrations to free movement. These changes occur at constant temperatures known as the substance's melting and boiling points.

The movement of particles in a solid substance as it is heated to its boiling point involves different states of matter: the solid, liquid, and gas phases. In the solid phase, the particles of the substance are closely packed together and vibrate about fixed positions. As the temperature of the solid rises due to the heat, the vibrations of the particles increase. Upon reaching the melting point, the solid begins to transform into a liquid, a process known as melting.

The temperature remains constant during this phase transition until the entire solid has melted. In the liquid phase, the particles are not as closely packed as in a solid and can move more freely. As the temperature continues to rise, the liquid will eventually reach the boiling point, where it starts transforming into a gas in a process called vaporization. During this phase change, the temperature again remains constant until all the liquid has become a gas.

In the gas phase, the particles move most freely, colliding with each other and filling the available space. The behavior of these phase transitions is determined by the substance's unique melting and boiling points, which are affected by the environment's pressure. Phase changes also involve changes in the amount of heat in the substance, with heat absorbed during melting and vaporization, and released during condensation and freezing.

https://brainly.com/question/21594831

#SPJ2

1.) Carbon Dioxide.

2.) Sulfur Trioxide.

3.) Dinitrogen trioxide.

4.) Dinitrogen pentoxide.

5.) Phosphorus trichloride.

6.) Ammonia.

7.) Sulfur Hexachloride.

8.) Phosphorus Pentoxide.

9.) Carbon Tetrachloride.

10.) Silicon Dioxide.

11.) Carbon Disulfide.

12.) Phosphorus tribromide.

13.) I don't have notes on this one so I don't know.

14.) Aluminum Oxide.

15.) Dichloride Heptoxide. (Not 100% sure if that was a 2 or a 7 at the end.)

Hope this helps and sorry it took so long I had to search through my chemistry notes from awhile ago. But I tried as best I could. :)

Covalent compounds' formulas are represented with symbols for each element involved and subscript numbers indicating the quantity of each element. Lewis structures can be used to visualize the bonds formed by shared electrons. Hydrate ionic compounds have additional notation for water molecules in their formulas.

The formula for covalent compounds is written using the symbols for each element involved, followed by subscript numbers to indicate the quantity of each element in the compound. For example, the compound composed of sulfur (S) and fluorine (F) is represented as SF₆, which shows that one sulfur atom is bonded with six fluorine atoms to form a molecule of this compound. Another example is N₂O₃, representing that two nitrogen (N) atoms and three oxygen (O) atoms are bonded together. Similarly, Cl₂O₇ indicates that two chlorine atoms bond with seven oxygen atoms to form this compound.

By using the Lewis structure, we can visualize how the atoms share electrons in order to form covalent bonds. When these molecules are formed, each atom shares its electrons with the others to create a stable connection, or bond, between them. The quantity of shared electrons is determined by the valence of each atom.

In terms of hydrate ionic compounds, the formula is written by adding a dot and the number of water molecules to the formula. For instance, if a compound includes water molecules, it will include a term such as '·2H₂O' included in the formula.

https://brainly.com/question/10748806

#SPJ3

Answer:74 calories to kilocalories  =0.074

Hope this helps

The pressure of helium gas in the given condition is 948.45 mm of Hg.

Explanation:

As per ideal gas law, the product of pressure and volume will be equal to the product of number of moles, gas constant and temperature of gas molecules. This is formed by the combination of three basic laws of kinetic theory of gases.

[tex]PV = nRT[/tex]

As the pressure P is unknown, but the volume V, temperature T and number of moles n is given for helium gas.

R = 8.314 J mol⁻¹ K⁻¹ = 62.363 mmHg L mol⁻¹ K⁻¹.

Then, pressure can be found as

[tex]P = \frac{nRT}{V}[/tex]

As T = 50°C = 50 + 273 K = 323 K and volume V = 223 mL = 0.223 L and n = 0.0105 mol

Then, [tex]P = \frac{0.0105*62.363*323}{0.223}=948.45 mm of Hg[/tex]

So, the pressure of helium gas in the given condition is 948.45 mm of Hg.

Answer:

15 moles of  ammonium sulfate would be formed from 30 moles of ammonia.

Explanation:

Given data:

Number of moles of ammonium sulfate formed = ?

Number of moles of ammonia = 30.0 mol

Solution:

Chemical equation:

2NH₃  +   H₂SO₄  →  (NH₄)₂SO₄

Now we will compare the moles of ammonium sulfate with ammonia.

                           NH₃           :           (NH₄)₂SO₄

                             2              :               1

                            30.0          :              1/2×30.0 = 15.0 mol

So 15 moles of  ammonium sulfate would be formed from 30 moles of ammonia.

c. 1.5 moles of Cu will contain a total of 9.0 * 10 ^ 23 atoms.

Explanation:

To convert moles into atoms,  the molar amount and number of atom is multiplied by Avagadro's number.

Avagadro's number is 6.022×[tex]10^{23}[/tex]  

So applying the formula in the given sample:

A) 0.5×6.022×[tex]10^{23}[/tex]

   3.01×[tex]10^{23}[/tex] atoms.

B) 0.75 mole of H20

O.75×6.022×[tex]10^{23}[/tex]

= 4.5166×[tex]10^{23}[/tex]  atoms.

C) 1.5 moles of Cu

  1.5×6.022×[tex]10^{23}[/tex]

  =  9.033×[tex]10^{23}[/tex]

D). 1.5 moles of H2

1.5 × 2 × 6.022 × [tex]10^{23}[/tex]

= 18.066 × [tex]10^{23}[/tex] atoms   because H2 is 2 moles of hydrogen.

Atom is the smallest entity of matter having property of the element to which it is a part.

The sample that contains 9.0 x [tex]10^2^3[/tex] atoms would be 1.5 moles of Cu.

1 mole of a substance contains 6.0 x  [tex]10^2^3[/tex] atoms of the same substance. Thus:

Hence, the only sample that contains  9.0 x  [tex]10^2^3[/tex] atoms is 1.5 mole of Cu.

More on number of atoms of substances can be found here: https://brainly.com/question/10614569?

Answer: your answers are between d or b

Explanation:

The Cosmic Microwave Background (CMB), a remnant heat from the Big Bang, supports the theory's predictability. Its discovery provided strong evidence for the beginning of the universe as theorized in the Big Bang Theory.

The predictability of the Big Bang Theory was proven by the presence of the Cosmic Microwave Background (CMB). The CMB refers to the thermal radiation that is presumed to be leftover from the 'Big Bang' – the explosion that marked the beginning of the universe approximately 13.8 billion years ago. This residual heat was predicted by the Big Bang Theory, and its eventual discovery provided strong evidence supporting the theory. Thus, it is the CMB that validated the predictability of the Big Bang Theory more than the other phenomena listed in your options.

https://brainly.com/question/32367575

#SPJ11

Answer:

28.45L

Explanation:

1mole of a gas occupy 22.4L at stp. This implies that 1mole of He also occupy 22.4L at stp.

Now if 1mole of He occupied 22.4L at stp, then, 1.27mol will occupy = 1.27x22.4 = 28.45L

Answer:

28.45L

Explanation:

Answer:

73818.9

Explanation:

for an approximate result, multiply the speed value by 197

Answer:

Two types of substances will dissolve in water: ionic compounds, such as sodium chloride (NaCl, or table salt) and compounds composed of larger molecules that have a net charge due to the arrangement of their atoms. Ammonia (NH3) is an example of the second type.

Explanation:

Answer:

sugar

salt

Explanation:

Answer:

Pressure is directly proportional to the density of a substance.

Explanation:

Pressure is a measure of force per unit area. Density is defined as mass per unit volume i.e the ratio of mass of a substance to it's volume.

Thus, it means that an increase in pressure results in an increase in density and vice-versa.

Explanation:If the mass of the object stays the same but the volume of the object decreases then its density becomes greater. If the volume of the object stays the same but the mass of the object increases then its density becomes greater.

Answer: M = 3 M

Explanation: Molarity is the ratio between the number of moles per unit Liter of volume.

M = n / L

= 6 mole / 2 L

= 3 M

Answer:

your answer is D -_- bc they want the approximate

Answer:

Option A. 3 × 10^21 molecules

Explanation:

From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules. This means that 1mole of H20 also contains 6.02x10^23 molecules.

1mole of H2O = (2x1) + 16 = 2 + 16 = 18g

If 1mole(i.e 18g) of H2O contains 6.02x10^23 molecules,

Therefore 0.1g of H2O will contain = (0.1 x 6.02x10^23) /18 = 3 x 10^21 molecules

Answer:

= 6.56 × 10²⁴ ions

Explanation:

We are given;

10.9 moles of Iron (iron doesn't exists as a molecules, so we can't have 10.9 molecules but we can have 10.9 moles)

We are required to determine the number of ions

We need to know that;

1 mole of iron = 6.022 × 10²³ ions

Therefore;

10.9 moles of iron will contain;

= 10.9 moles × 6.022 × 10²³ ions/mol

= 6.56 × 10²⁴ ions

Hence, 10.9 moles of iron contains 6.56 × 10²⁴ ions

In an endothermic reaction products are HIGHER than reactants in potential energy and LESS stable.

Explanation:

Energy is input into the reaction in an endothermic reaction. This means the products are of a higher energy level than the reactants. Therefore the reaction increases Gibb's free energy and reduces entropy. Remember in thermodynamic stability involves an increase in entropy and a decrease in Gibbs free energy. Therefore the products are less stable than the reactants. This is why endothermic reactions do not occur spontaneously like exothermic reactions.

A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs.

A mixture can usually be separated back into its original components. Some examples of mixtures are a tossed salad, salt water and a mixed bag of M&M's candy.

Answer:

a. pH paper can tell you the pH. pH paper only can turn a variety of colors that represent different pH numbers.

B. Litmus paper only tells you acid or base in order to turns red or blue color.

Explanation:

pH paper is a type of paper which is used for the identification of pH of the substance. On pH paper, colors are present which shows pH numbers of a solution while litmus paper is a type of paper which is used for the identification of solution whether it is acidic or basic. There are two colors i. e. Red and Blue. If the litmus paper turns red, the solution is acidic or if the litmus paper turns blue, the solution is alkaline or basic.

Answer:

False

Explanation:

The temperature at which a solid melts, known as its melting point is highly characteristic of a compound and element.

The melting point of pure substances, compounds and elements is definite and not varied.

Therefore, melting point of most solids is characteristic of compounds and elements.

Answer:

false

Explanation:

it can be differ when the concentration,surface area and when the rate of reaction is changed

Final answer:

The statement is false. Reaction rates are affected by the size of the reactant particles because smaller particles have a greater surface area, which increases the number of collisions and the rate of reaction.

Explanation:

The statement that chemical reactions occur at the same rate no matter what the size of the reactant particles is false.

The rate of a chemical reaction is influenced by various factors. One of these factors is the state of subdivision of the reactants, which pertains to the size of the reactant particles. A reaction between two reactants, for example, will often occur at a faster rate if one reactant is in the form of many small particles rather than one large lump. This is because many small particles have a greater surface area, leading to more collisions, which increases the reaction rate.

Other factors affecting the rate include the chemical nature of the reacting substances, temperature, concentration of the reactants, and the presence of a catalyst. Each of these can have a significant impact on how quickly a reaction proceeds.

Answer:

Volume will goes to increase.

Explanation:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

So when the temperature goes to increase the volume of gas also increase. Higher temperature increase the kinetic energy and molecules move randomly every where in given space so volume increase.

Now we will put the suppose values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 4.5 L × 348 K / 298 k

V₂ = 1566 L.K / 298 K

V₂ = 5.3 L

Hence prove that volume increase by increasing the temperature.

The correct answer is a reference point.

To determine whether or not an object moves, one must have a reference point. A reference point is a fixed point that is used to determine if an object has changed its position. Without a reference point, it is impossible to ascertain whether an object is moving or at rest because motion is relative. An object may appear to be moving when observed from one reference point, but it could be stationary when observed from a different reference point.

Distance alone does not indicate motion; it only specifies the amount of space between two points. Displacement is the change in position of an object, which requires a reference point to be measured. Standard units are necessary for quantifying distance or displacement but do not themselves indicate motion.

In summary, while distance, displacement, and standard units are important for describing the motion of an object, a reference point is the fundamental requirement to determine whether an object is moving.

Answer:

Different atmospheric pressure. When there is a different atmospheric pressure, air moves from the higher pressure to the lower pressure area which results in what you call WIND but can result in various speeds and pressure.

Hope this helped and if it did, please give my answer a brainliest.

Answer:

Wind is caused by differences in the atmospheric pressure.

Explanation:

When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds.

Answer:

8.46mph

Explanation:

Given parameters:

Distance run = 1500m

Time taken to cover distance = 403s

Unknown:

Average speed in mph = ?

Solution:

The average speed of a travel is the rate of change of the total distance with time.

Speed is a scalar quantity that specifies magnitude of the travel but no direction.

    Average speed = [tex]\frac{Total distance covered }{Time taken}[/tex]

we need to covered distance to miles from m and time in seconds to hours.

       1609m = 1 mile

       1500m = [tex]\frac{1500}{1609}[/tex] =  0.93miles

                       3600s = 1hr

                        403s  = [tex]\frac{403}{3600}[/tex]  = 0.11hr

Average speed = [tex]\frac{0.93}{0.11}[/tex]   = 8.46miles per hour

Answer:

There are 55, 49 g of CaCl2

Explanation:

We calculate the weight of 1 mol of CaCl2:

Weight CaCl2=Weight Ca + 2x(Weight Cl)= 40,08g+ 2x 35, 45g=110,98 g/mol

1000ml-----2 mol of CaCl2

250ml------x= (250 ml x 2 mol of CaCl2)/1000ml= 0,5 mol of CaCl2

1mol -----110,98g

0,5mol ---x= (0,5molx110,98g)/1 mol= 55,49 g

We have that For the Question"What kinds of elements form an ionic bond"

We see from the Definition that this kind of bond is formed b/w metals and non-metals

From the question we are told

What kinds of elements form an ionic bond

Generally

The Other Name for Ionic bond is covalent bond and it is formed when two ions of variant charge converge  and this kind of bond is formed b/w metals and none metals

Therefore

For the Question

What kinds of elements form an ionic bond

We see from the Definition that this kind of bond is formed b/w metals and non-metals

For more information on this visit

https://brainly.com/question/17756498

Answer:

rain acts like a light prism which displays rainbow colors when light is shown through

Answer:

We see rainbow when the sun is behind us and and falling rain is in front of us

Explanation:

when sunlight strikes a falling drop of water it is retracted , changed indirection, by the surface of the water