what makes a substance a molecule? it’s 7th grade science

Answer:

Granite Solid

Milk Liquid

Neon is gas

Wood Is solid

Paper is solid

Helium is Gas

Water is liquid

Air is Gas

Alcohol is liquid

Metal is solid

Nitrogen is gas

Juice is liquid

Oil is liquid

Water Vapor is Gas

Brick is Solid

Propane is Gas

Fabric is solid

Gasoline is Liquid

Explanation:

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Answer:

Nitrogen

Explanation:

The element nitrogen cannot be a product in the given reaction.

  The reaction is;

    HCl  + CaCO₃

According to the law of conservation of matter, "matter is neither created nor destroyed in the cause of a chemical reaction".

The law suggests that, in a chemical reaction, we end up with the same species we started with. Although due to rearrangement of bonds,  new compounds can form;

Starting atoms

     H

     Cl

     Ca

      O

These species will also be found in the product.

Answer:

in mountainous regions

Explanation:

The rivers usually begins in mountainous regions. A river's source is typically located in a high area, such a mountain or a hill. A river may have several sources. Some rivers start where an underground natural spring discharges water.

A mountain is an elevated area of the crust of the Earth, typically with steep sides that reveal a substantial amount of bedrock that has been exposed.

Although definitions vary, a mountain is often taller than a hill, rising normally at least 300 meters above the surrounding terrain, and differs from a plateau in having a constrained peak region.

Every river has a beginning place where the water flow starts. We refer to this source as a headwater. Some rivers have their beginnings in hills or mountains, where rainwater or snowmelt gathers and creates little channels.

It is possible for the headwater to originate from mountain snowmelt or rainfall, but it is also possible for it to bubble up from the ground or develop at the edge of a lake or big pond.

Thus, option C is correct.

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Answer:

Barium Sulfite

Explanation:

Barium Sulfite

The IUPAC name for BaSO₃ is barium sulfite.

"Ba" stands for barium, which is the chemical symbol for the element with atomic number 56. Barium is an alkaline earth metal and belongs to Group 2 of the periodic table.

"SO₃" stands for sulfite, which is a polyatomic ion composed of one sulfur atom (S) and three oxygen atoms (O). The chemical formula for the sulfite ion is SO₃²⁻. The sulfur atom in the sulfite ion has a +4 oxidation state.

When barium (Ba) reacts with the sulfite ion (SO₃²⁻), they combine to form barium sulfite (BaSO₃). The balanced chemical equation for the reaction is:

Ba²⁺ + SO₃²⁻ → BaSO₃

Barium sulfite is an ionic compound, where the Ba²⁺ ion and the SO₃²⁻ ion are held together by electrostatic attractions (ionic bonds). In its solid form, barium sulfite appears as a white crystalline powder.

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Answer: b) Crash 2; the force on the cart was stronger in this crash, so the force on the skateboard was also stronger.

Explanation:

Answer:

mirar respuesta abajo

Explanation:

Muy bien. Antes de responder lo que piden en el problema, vamos a calcular la concentración inicial de la solución A:

1) Concentración de la solución A:

En este caso, se sabe que se usaron 3,5 g de la sal, se puede calcular los moles usando el peso molecular y la masa:

n = m/PM  (1)

Aplicando tenemos:

n = 3,5 / 98 = 0,0357 moles

Conociendo los moles, podemos calcular la concentración:

M = n/V (2)

Aplicando la formula tenemos:

M = 0.0357 / 0.200 = 0.1785 M

Esta es la concentración del ácido etiquetado como "Solución A".

Ahora podemos ver la concentración de la solución B, para luego calcular las concentraciones molares de los iones en solución y sus respectivos pH.

2) Concentración del ácido en la solución B:

Con la concentración de "A", se puede determinar la concentración de la solución B. Aqui podemos esperar que sea un valor mas bajo, puesto que es una dilución la que estamos haciendo. Por lo tanto.

Si se toma 5.5 mL de la solución A, entonces:

n = 0.1785 * 0.0055 = 0.00098 moles

Con esto, se calcula la nueva concentración:

M = 0.00098 / 0.070 = 0.014 M

Esta es la concentración de la solución B. Ahora para calcular pH y concentraciones de los iones en equilibrio, hay que plantear la reacción acido base en equilibrio. Como es el mismo compuesto, usaremos la misma ecuación.

3) pH de las soluciones A y B:

Planteamos la reacción de equilibrio:

CH₃COO⁻ + H₂O <------> CH₃COOH + OH⁻     Kb

Calculando el Kb, sería asi:

Kb = Kw/Ka

Kb = 1x10⁻¹⁴ / 1.8x10⁻⁵ = 5.56x10⁻¹⁰

Ahora reescribimos la ecuación y hacemos una tabla de equilibrio:

       CH₃COO⁻ + H₂O <------> CH₃COOH + OH⁻     Kb = 5.56x10⁻¹⁰

i)        0.1785                                    x              x

eq)    0.1785-x                                  x              x

Kb = [OH⁻] [CH₃COOH] / [CH₃COO⁻]

Reemplazando nos queda:

5.56 * 10⁻¹⁰ = x² / (0.1785-x)      

Y como Kb es muy pequeño, se asume que el valor de x será también pequeño, asi que podemos redondear la resta a simplemente 0.1785, quedando tan solo:

5.56 * 10⁻¹⁰ = x² / (0.1785)

x² = 5.56*10⁻¹⁰ * 0.1785

x = √9.9246*10⁻¹¹

x = 9.96*10⁻⁶ M

Esta es la concentración de [OH⁻] y [CH₃COO⁻] en la solución A.

Aplicando lo mismo para la solución B (Cambiando solo el dato de concentración) nos queda:

x = √5.56*10⁻¹⁰ * 0.014

Finalmente, para calcular pH, se calcula primero el pOH y luego el pH:

pH = 14 - pOH

pOH = -log[OH⁻]

Para la solución A:

pOH = -log(9.96*10⁻⁶) = 5

pH = 14 - 5

En el caso de la solución B:

pOH = -log(2.79*10⁻⁶) = 5.55

pH = 14 - 5.55

Espero te ayude

Answer:

2.67 x 10⁷km

Explanation:

Given parameters:

    Time of arrival of p-waves  = 2: 10: 00

    Time of arrival of s-waves = 2: 15: 20

Unknown:

Distance of wave from epicenter  = ?

Solution:

 To find the distance of the wave from the epicenter;

     Distance = 3 x 10⁸ x time interval

Time interval = Time of arrival of p-waves  - Time of arrival of s-waves

                       =  2: 10: 00 - 2: 15: 20

                       = 5min 20s

                       = 320s

Now, we need to convert the time to hrs;

        3600s  = 1hr

         320s  = [tex]\frac{320}{3600}[/tex]  = [tex]\frac{4}{45}[/tex]hr

So,

   Distance =  3 x 10⁸  x [tex]\frac{4}{45}[/tex]   = 2.67 x 10⁷km

Answer:

Granite and Titanium​ will sink

Explanation:

Granite and Titanium will sink in water.Granite and Titanium will sink in water because density of Granite and Titanium is higher then water. Also there raw shape does not help them to float on water.

Answer:

explanations below

Explanation:

The alkaline earth metals are the 6 chemical elements that can be found in group two of the periodic table. These elements have a lot of properties in common, in the sense that they are generally shiny, reactive at standard temperature and pressure and they are also silvery-white. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)

These metals have two electrons at their orbits, which can be easily lost to form cations (with charge +2, and an oxidation state of +2)  

Below are some of their details

Name: Beryllium  

Number of Protons/Electrons: 4  

Number of Neutrons: 5  

Name: Magnesium  

Number of Protons/Electrons: 12  

Number of Neutrons: 12  

Name: Calcium  

Number of Protons/Electrons: 20  

Number of Neutrons: 20  

Name: Strontium  

Number of Protons/Electrons: 38  

Number of Neutrons: 50  

Name: Barium  

Number of Protons/Electrons: 56  

Number of Neutrons: 81  

Name: Radium  

Number of Protons/Electrons: 88  

Number of Neutrons: 138  

Answer:

there would be no effect

Explanation:

The chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, [tex]Co^+[/tex], [tex]Ni^{2+}[/tex]

Explanation:

So, from this, we can write chemical symbols for three different atoms or atomic cations with 26 electrons are Fe, [tex]Co^+[/tex], [tex]Ni^{2+}[/tex].

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this is lithium ion with a +1 charge

Answer: A.

Explanation:

The molecular formula for glucose is C6H12O6. This means that there are 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms bonded together to make one molecule of glucose.

Hopes this helps!

Answer:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

Explanation:

Answer:

Sulfur

Explanation:

Answer:

Detail is given below.

Explanation:

Calcium is alkaline earth metal. It has two valance electron. Thus calcium needs six more electron to complete the octet. Thus, its very easy for calcium to remove its two electron and get complete octet.

Electronic configuration of Ca:

Ca₂₀ = [Ar] 4s²

While,

Fluorine is halogen. It has seven valance electrons. It needed only one electron to complete the octet. When it combine with calcium , calcium loses two electrons thus two atom of fluorine combine with one atom of fluorine and stable compound calcium fluoride is formed.

Electronic configuration of F:

F₉  = [He] 2s² 2p⁵

Chemical equation:

Ca  + F₂     →     CaF₂

Ayour anwerser

Explanation

Answer:

chlorine manoxside

co2

Explanation:

Answer:

two

Explanation:

There are two atoms in 2 Fe, more correctly written as 2Fe or Fe2. Both atoms are from the same element, iron.

Answer:

2

Explanation:

There are two atoms of the same element in 2Fe.

Hope this helps! :)

Answer:

The answer is A

Explanation:

Answer:first one

Explanation:

A pure substance has same chemical properties throughout , it cannot be  separated by any means and it is made up of one kind of atom.

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

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you should

MOL × NA(Avogadro Constant)

Mol = 4

HNO3 = 5 Atome ( 1H + 1N + 3O)

NA = 6.02 × 10* ( * = 23)

[tex]4 \times 5 \times 6.02 \times {10}^{23} = 20 \times 6.02 \times {10}^{23} = 120.4 \times {10}^{23}atom [/tex]

Answer:

2.408 x 10^24

GREETINGS!

One mole of a substance is equal to 6.02 × 10²³ units of that substance. The number 6.022 × 10²³ is known as Avogadro's number.

so if one mole of molecule is equal to that number so,

                              for 4 moles of [tex]HNO_{3}[/tex]= 4 x ([tex]6.02x10^{23}[/tex])

so answer is,

                      2.408 x 10^24

HOPE IT HELPS YOU.

Answer:

Explanation:

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

From the question

volume = 2.45 mL

density = 4.255g/mL

We have

mass = 2.45 × 4.255 = 10.42475

We have the final answer as

Hope this helps you

Answer: Two hydrogen atoms

Explanation:

A water molecule (formally known as dihydrogen monoxide) is composed of two hydrogen atoms and one oxygen atom. But you can't simply take two hydrogen atoms and stick them onto an oxygen atom. The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy.

Answer:

n=c/v.

1.5=3×10^8/v

v=3×10^8/1.5

v=2×10^8 m/s

Hope this helps :)

The index of refraction for plastic, when speed of light in plastic is 1.5.

Refraction index of any substance will be calculated by using the below equation:

n = c/v, where

c = speed of light in vaccum = 3×10⁸ m/s

v = speed of light in plastic = 2×10⁸ m/sec

On putting values in the above equation, we get

n = 3×10⁸ / 2×10⁸ = 1.5

Hence the refractive index of plastic is 1.5.

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Answer:

101

Explanation:

Answer:

Explanation:

Answer:

kldja

Explanation:

A.) primary

B.) tertiary

C.) secondary

D.) ammonia

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