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2 years ago

Which of the following is true about gravity? Select all that apply.

Chemistry

2 answers:

romanna [79]2 years ago

7 0

Answer:

A and B are the correct answers.

Svetach [21]2 years ago

3 0

Answer:

A and B are correct

Explanation:

<em>A</em> and <em>B</em> are the most logical answers from the 4 given. This is because just like the moon and Earth, Earth keeps the moon in its orbit with gravity.

A gravitational force can happen with any two objects in the universe. An example of this is a passing asteroid being pulled into Jupiter's atmosphere, because of the gravitational pull. Even two asteroids can have a gravitational pull/force on each other. If there is a big asteroid with smaller asteroids surrounding it, the smaller asteroids will "follow" the larger asteroid.

C is false, because the bigger the mass the bigger the pull (gravitational)

D is also false because if the gravitational force could only exist if there was contact, logically then the moon wouldn't still be orbiting Earth. In other words "Does the moon touch the Earth?" No, it does not "Is the moon still orbiting around Earth without contact?" Yes it is

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What would the unit of measurement be for the density of a regular solid?

balu736 [363]

Answer:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

7 0

3 years ago

Refer to the following unbalanced equation:

user100 [1]

Mass of Oxygen (O₂) : = 88.16 g

<h3>Further explanation</h3>

Given

Reaction(unbalanced)

C₆H₁₄+ O₂ → CO₂ + H₂0

25 g C₆H₁₄

Required

mass of oxygen (O₂)

Solution

Balanced equation

2C₆H₁₄ + 19O₂ ⇒12 CO₂ + 14 H₂O

mol C₆H₁₄ (MW=86,18 g/mol) :

= mass : MW

= 25 g : 86.18 g/mol

= 0.29

From the equation, mol ratio of C₆H₁₄ : O₂ = 2 : 19, so mol O₂ :

= 19/2 x mol C₆H₁₄

= 19/2 x 0.29

= 2.755

Mass O₂(MW=32 g/mol) :

= 2.755 x 32

= 88.16 g

6 0

3 years ago

What does a molecule of a substance that is made up if three elements look like

nasty-shy [4]

Answer:

Whether something is a molecule or not depends on the type of bond that is formed when its atoms join together. In general, electrons can be shared between atoms (a molecular bond) or electrons can be completely removed from one atom and given to another (an ionic bond). Molecules have molecular bonds.

Explanation:

8 0

3 years ago

Identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chlo

Otrada [13]

Answer:

Explanation:

Solvent-Solvent interactions:

The existing bonding or interactions between the molecules of water are a dipole-dipole interaction. When NaCl solutes are dissolve in water it disturbs this existing dipole-dipole bond between the molecules of water.

Solute-Solute interactions: the solute-solute interaction is bond between molecules of the solute NaCl, NaCl is an ionic compound so the existing interaction between NaCl is ion-ion (NA+Cl-) interaction. When dissolved in water, the molecules of water tends to break this ion-ion interaction of NaCl.

Solute-Solvent interactions: this is the interaction that results to dissociation of NaCl. When NaCl is dissolved in H2O the ion-ion interaction of NaCl is broken, the molecules of the solvent interact with the molecules of the solute. This forms interactions between Na+ and O-, and interaction between H+ and Cl-

6 0

3 years ago

Consider the mixture of ethanol, c2h5oh, and o2. how many molecules of co2, h2o, c2h5oh, and o2 will be present if the reaction

Natali [406]

The reaction between ethanol and oxygen must be a combustion reaction to give carbon dioxide and water as products.

The reaction between ethanol, $C_2H_5OH$ and oxygen, $O_2$ is as follows:

$C_2H_5OH+O_2\rightarrow CO_2+H_2O$

In order to balance the reaction (the number of atoms of each element in the reaction are same on both the sides that is product and reactant), $O_2$ is multiplied by 3 in the reactant side and $CO_2$ is multiplied by 2 and $H_2O$ is multiplied by 3 on product side.

So, the balanced reaction is:

$C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O$

From the balanced reaction it is clear that 1 mole of $C_2H_5OH$ reacts with 3 moles of $O_2$ to give 2 moles of $CO_2$ and 3 moles of $H_2O$ .

Since, 1 mole = $6.022\times 10^{23}$ molecules (Avogadro's number)

So,

Number of molecules of $C_2H_5OH$ = $6.022\times 10^{23}$ molecules.

Number of molecules of $O_2$ = $6.022\times 10^{23}\times 3 = 18.066\times 10^{23}$ molecules.

Number of molecules of $CO_2$ = $6.022\times 10^{23}\times 2 = 12.044\times 10^{23}$ molecules.

Number of molecules of $H_2O$ = $6.022\times 10^{23}\times 3 = 18.066\times 10^{23}$ molecules.

3 0

3 years ago

Read 2 more answers