Put the following elements in order of increasing atomic number:

1. Strontium
2. Fluorine
3. Terbium
4. Zirconium
5. Iodine
6. Europium
7. Gallium
8. Aluminum

Answer:

Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).

Answer:

body hair

Explanation:

in the hot climate,human bodies had to adapt inscrasing the number of bodyhair on the skin to coll off the body

Answer:

Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. Gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation:

Answer:

Fresh Water is your answer

Fresh water is a direct ecosystem service. Therefore, the correct option is option B among all the given options.

An ecosystem, also known as an ecological system, is made up of all the creatures and the physical setting in which they live. The nutrition cycles and energy fluxes connect these both biotic and abiotic elements. Photosynthesis is how energy enter the system and is absorbed by plant tissue.

Animals play a significant part in the transfer of materials and energy through the system by eating plants and one another. They also have an impact on the biomass levels of the microbial and plant communities.  Fresh water is a direct ecosystem service.

Therefore, the correct option is option B.

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Answer/Explanation:

f is the number of waves produced by a source per second, it is measured in hertz (Hz). T is the time it takes for one complete oscillation, it is measured in seconds. All waves, including sound waves and electromagnetic waves, follow this equation. A radio wave has a time period of 0.0000003333333 seconds.

Answer:

B. by finding its speed and direction

Kinetic energy is the energy an object has due to its motion. As long as an object is moving at the same velocity, it will maintain the same kinetic energy. The kinetic energy of an object is calculated from the velocity and the mass of the object.

Answer:

B

Explanation:

Not C or D becuase it is data would not show a conclusion and observations does show the conclsuion of the scientists.  Not A becuase explanation does not mean they have data to support their conclusion.  Therefore, it would be B becuase results show what was the effect of something and is often supported with data

Hope that helped :)

Answer:

Balloon will burst

Explanation:

The amount of volume that can be held by the latex will reduce yet the volume of air inside does not change. therefore the air inside will force the latex to break.

Assume that you tie the balloon to prevent air from escaping and then squeeze the balloon with one hand, so there is less space inside it then balloon will burst.

latex is what latex balloons are made of. Due to tiny microscopic holes in the latex, it is porous and does not hold helium for as long as foil balloons (mylar balloons).

While latex balloons usually float for only 8–24 hours, foil balloons typically float for 4–21 days. But you can actually get a latex balloon to float longer than a foil balloon by using a product called hi-float, which extends the life of a latex balloon by 25 times the average float time.

In addition to being available in a variety of colors and prints in sizes ranging from 5" to 3 feet, latex balloons can also be printed in many colors, however if you want a detailed design you really need to use foil balloons.

Therefore, Assume that you tie the balloon to prevent air from escaping and then squeeze the balloon with one hand, so there is less space inside it then balloon will burst.

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Answer:

Released

Explanation:

they convert into a form of energy that can be used by cells

Answer: 218.4 g of [tex]CaO[/tex] will be produced from 3.9 moles of [tex]CaCO_3[/tex]

Explanation:

The balanced chemical equation is:

[tex]CaCO_3\rightarrow CaO+CO_2[/tex]  

According to stoichiometry :

1 mole of [tex]CaCO_3[/tex] produce =  1 mole of [tex]CaO[/tex]

Thus 3.9 moles of [tex]CaCO_3[/tex] will produce=[tex]\frac{1}{1}\times 3.9=3.9moles[/tex] of [tex]CaO[/tex]

Mass of [tex]CaO=moles\times {\text {Molar mass}}=3.9moles\times 56g/mol=218.4g[/tex]

Thus 218.4 g of [tex]CaO[/tex] will be produced from 3.9 moles of [tex]CaCO_3[/tex]

218.4 grams of CaO is produced using 3.9 moles CaCO₃.

Moles of any substance will be define as:

n = W / M

Given chemical reaction is:

CaCO₃ → CaO + CO₂

From the above equation it is clear that according to the concept of stoichiometry 1 mole of CaCO₃ is producing 1 mole of CaO. By using above formula we calculate grams as follow:

W = n × M, where

n = no. of moles of CaO = 3.9 moles

M = molar mass of CaO = 56 g/mole

W = 3.9 × 56 = 218.4 g

Hence, 218.4 grams of CaO is produced.

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Answer:

It released hydroxide ions (OH ¯).

Explanation:

A PH of 8.3 indicates that the solution has become a basic solution.

Now, for us to have a basic solution from the addition of an alka-seltzer to Koolaid, it means the Alka-seltzer released plenty of hydroxide ons (OH¯) to the solution.

Answer:

Tellurium Fluoride

Explanation:

Answer: [tex]33.31\times 10^{23}[/tex] molecules of [tex]OF_2[/tex]  

and 11.06 moles of Flourine

 Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

1 mole of [tex]OF_2[/tex] contains= [tex]6.022\times 10^{23}[/tex]  molecules of [tex]OF_2[/tex]

Thus 5.53 moles of [tex]OF_2[/tex] contains=[tex]\frac{6.022\times 10^{23}}{1}\times 5.53=33.31\times 10^{23}[/tex] molecules of [tex]OF_2[/tex]  

1 mole of [tex]OF_2[/tex] contains= 2 moles of Flourine

5.53 moles of [tex]OF_2[/tex] contains=[tex]\frac{2}{1}\times 5.53=11.06[/tex] moles of Flourine

Answer:

C14H30 -----> C7H14 + C2H4 +C5H10

Explanation:

Answer:

Kindly check the explanation section.

Explanation:

Without mincing words let's dive straight into the solution to the question.

The instructions given in the question above is very important as it concerns the total adsorption of the product on the silica gel. The instruction is made so that adsorption of the product is on the silica gel so as to avoid the distortion in polarity of the compound.

Part B.

If the student avoid the step, there would be problem of which the compound which is in mixture will be running out of the column. Also, the compounds won't be made pure.

In summary, for the first part adsorption is done on the silica gel thus, the instructions is to be followed.

For the second part, if the step is not avoided then the Compounds will be made pure if the step

Answer: Volume required is 0.115 L or 115 ml

Explanation:

moles of [tex]NaHCO_3[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{1.30g}{84g/mol}=0.015mol[/tex]

The balanced chemical equation is:

[tex]HCl+NaHCO_3\rightarrow NaCl+H_2CO_3[/tex]

1 mole of [tex]NaHCO_3[/tex] requires = 1 mole of HCl

Thus 0.015 mol of [tex]NaHCO_3[/tex] requires = [tex]\frac{1}{1}\times 0.015=0.015[/tex] mole of HCl

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in L

[tex]0.130=\frac{0..015}{V_s}[/tex]

[tex]V_s=0.115L[/tex]

Thus volume required is 0.115 l or 115 ml

Answer:

Examples of strong acids are hydrochloric acid (HCl), perchloric acid (HClO4), nitric acid (HNO3) and sulfuric acid (H2SO4). A weak acid is only partially dissociated, with both the undissociated acid and its dissociation products being present, in solution, in equilibrium with each other.

Explanation:

Hope this helps you

Answer:

i think its b

Explanation:

Answer:

Explanation:

Para mejor entendimiento, reeescribiremos la ley que pusiste:

S = 64t - 8t²    (1)

De acuerdo al enunciado del problema, S tiene unidades de pie y t en segundos, por lo tanto, S, que se refiere a la posición o altura alcanza de la piedra, puede ser determinado usando esa expresión a tiempos específicos.

Para el calculo de velocidad usamos la siguiente expresión:

V = -g * t     (2)      g: 32.16 ft/s

Tomando en cuenta estas expresiones, veamos los valores de posición y velocidad:

a) Para t = 2 s

S = 64(2) - 8(2)²

S = 96 ft

V = -32.16 * 2

V = -64.32 ft/s

Para t = 3 s

S = 64(3) - 8(3)²

S = 120 ft

V = -32.16 * 3

V = -96.48 ft/s

b) Para saber la altura que alcanzará, usamos la expresión de altura máxima que es la siguiente:

Smáx = -V₀² / 2g   (3)

Para el valor de la velocidad inicial, podemos asumir el valor de la velocidad dada por la formula de la ley S, que es 64. Esto porque al ser multiplicado por el valor del tiempo, queda en unidades de distancia, asi que este valor debe tener unidades de velocidad. Reemplazando este valor en la expresión:

Smáx = -(64)² / 2 * 32.16

Smáx = 63.68 ft

c) Para esta parte, usamos nuevamente la formula de la ley S, usando t = 4 s y listo:

S = 64(4) - 8(16)

S = 128 ft

Espero te sirva

Answer:

See explanation

Explanation:

The mechanism involves SN1 nucleophilic substitution reaction. The -OH group of the alcohol is first protonated. Since water is a good leaving group, -OH2 leaves the substrate creating a primary carbo cation.

A 1,2 methyl shift now occurs to create a tertiary carbo cation which is more stable leading to the major product shown in the image attached to this answer.

Answer:

1.40 moles of H₂SO₄.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below below:

2Al + 3H₂SO₄ —> Al₂(SO₄)₃ + 3H₂

From the balanced equation above,

2 moles of Al reacted with 3 moles of H₂SO₄.

Finally, we shall determine the number of mole of H₂SO₄ required to react with

0.93 moles of Al. This can be obtained as follow:

From the balanced equation above,

2 moles of Al reacted with 3 moles of H₂SO₄.

Therefore, 0.93 moles of Al will react with = (0.93 × 3)/2 = 1.40 moles of H₂SO₄.

Thus, 1.40 moles of H₂SO₄ is needed for the reaction.

Explanation:

a metal is an element that readily forms positive ions (cations) and has metallic bonds.

Group two of the periodic table comprises the elements beryllium, magnesium, calcium, strontium, barium and radium. The elements in this group, which are all shiny and silvery-white in appearance, are known as the alkaline earth metals. Like the alkali metals, they form alkaline solutions when they react with water.

Answer:

I think beaker three will take longer to boil since there is more water present,compared to the other beakers

Hello. You forgot and show the compounds. The compounds are in the attached image.

Answer:

I < II < III

Explanation:

The stability of the presented compounds must be analyzed, taking into account the free electrons to form arrangements between the atoms. In this case, the molecules of greater stability follow the concept of valence and are characterized as those that manage to reach a large number of elements that manage to obey the octet rule.

Answer:

The options are unclear, however, the correct option is:

Aqueous solutions of ionic compounds cause to dissociate, hence, ions are free to conduct electricity

Explanation:

Ionic compounds are compounds formed from ions (charged atoms). For example, NaCl is an ionic compound from the following ions; Na+ (cation) and Cl- (anion). One characteristics of ionic compounds is their ability to dissociate into the ions that form them when in an aqueous solution i.e. NaCl will dissociate into Na+ and Cl- when in an aqueous solution.

These disssociated ions are free to conduct electricity, hence, making ionic compounds good conductors of electricity.

Answer:

A. Eight

Explanation:

Although there are eight major endocrine glands scattered throughout the body, they are still considered to be one system because they have similar functions, similar mechanisms of influence, and many important interrelationships.