According to VSEPR theory, what is the bond angle of CCl4?
a. 90
b. 109.5
c. 120
d. 180

Answer:

I think you would pretty much get the answer wrong.

You won´t get full credit. sorry for your wrong test answer, :(

Explanation:

The correct answer would be copper and mercury do NOT react with hydrochloric acid.

Answer:

There are the same number of oxygen atoms in the reactants and the products

Explanation:

However the equation is not balanced

3 Ca on one side and 1 on the other

Answer:

the atomic number of the atom can be determine through the number of protons in the nucleus

The protons are usually the atomic number.

Answer:

The balls in Pair 2 have a greater mass than the balls in Pair 1.

Answer:

103 so easy so free dogwater

Explanation:

Mass percentage does not have any unit as numerator and denominator contains the same unit. The mass of  rock is 2.56×10⁶g when it contains 1.0 x 10³ kg of iron in it.

Mass percentage represents the the percentage of each element that is making a particular compound.

Mathematically,

Percentage of mass = (component’s mass ÷ total mass) x 100%

Percentage of mass of ferric oxide is =  78% by mass in rock

From this we can interpret the following

100 g of rock contains = 78gram ferric oxide

(100÷78)g of rock contains= 1 gram of ferric oxide

mass of iron in rock =1.0 x 10³ kg = 1.0 x 10⁶ g

(100÷78)×1.0 x 10⁶ g of rock  = 1.28×10⁶g of ferric oxide

now 1 mole of ferric oxide contains 2 atoms of iron, so the total mass of iron is 1.28×10⁶g ×2=2.56×10⁶g of iron.

Therefore the mass of  rock is 2.56×10⁶g when it contains 1.0 x 10³ kg of iron in it.

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Answer:

The correct answer to your Question is B.

Explanation:

Hope you have a great day :)

The substance from the options that will dissolve most rapidly is : ( B ) Powdered sugar in hot water.

Increase in temperature, state of solute and volume will determine the rate at which solubility occurs. The powdered sugar is in less solid state when compared to sugar cubes and therefore will dissolve most rapidly in hot water than a sugar cubes in hot water.

Hence we can conclude that The substance from the options that will dissolve most rapidly is : ( B ) Powdered sugar in hot water.

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Answer: a. 249.5 g/mol

b. 1.996 g

c. Measure 1.996 g of [tex]CuSO_4.5H_2O[/tex] and dissolve in water until the volume is 400 ml

Explanation:

Molar mass is the sum of atomic masses of all the elements present.

Thus molar mass of [tex]CuSO_4.5H_2O[/tex] = 1(63.5)+1(32)+4(16)+5(18) = 249.5 g/mol

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

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{given mass of solute}\times 1000}{\text {Molar mass of solute}}\times \text{Volume of solution in ml}}[/tex]

[tex]0.02mol/L=\frac{x\times 1000}{249.5g/mol\times 400}[/tex]

[tex]x=1.996 g[/tex]

c. We need to measure 1.996 g of [tex]CuSO_4.5H_2O[/tex] and dissolve it in water to make the volume 400 ml.

Explanation:

The enzyme 's active site binds to the substrate. Increasing the temperature generally increases the rate of a reaction, but dramatic changes in temperature and pH can denature an enzyme, thereby abolishing its action as a catalyst. ... When an enzyme binds its substrate it forms an enzyme-substrate complex.

Answer:

1 = one

2 = fluorine

3 = Bromine

4 = increase

5 = first increaseas and then decreases

hope it helps

Answer:

A

Explanation:

Just took the quiz

The irregularity of the chart means that, monitoring concentrations of pollutants has been ineffective.

The EPA is the environmental protection agency which takes care of the set limits of pollutamts that are released into the environment. The chart shows the monitoring of the concentrations of pollutants over a period of time.

We can see tat the chart is so irregular. The irregularity of the chart means that, monitoring concentrations of pollutants has been ineffective.

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Answer:

Because you can see the stars everynight pretty much, but the planets you need a telescope for. Plus, the planets are moving everynight making night and day so they all move! :)

Explanation:

Hope this helps! Brainliest plz?

Answer:

C

Explanation:

Answer:

the final reaction

Explanation:

a chemical reaction is caused from the two reactants

Answer:

The structure of the atom.

Explanation:

The correct answer is - The structure of the atom.

Reason -

An atom is the smallest unit of matter that retains all of the chemical properties of an element.

In modern times, we know that the elements in a given group (also known as a family or column) have the same number of valence electrons, with ground state configurations having a consistent pattern, for instance:

F 1s2 2s2 2p5, Cl 1s2 2s2 2p6 3s2 3p5, Br 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5, etc.

Of course, the ground state configurations play a major role in determining how an element reacts and what compounds it forms. Thus, the elements in a given group have similar properties.

The structure of the table also predicts how the properties vary. For instance, atomic radius increases down a group as does metallic character.

Explanation:

Answer:

Rainforest

Explanation:

rainforests tend to have high humidity, explaining why you always sweat there. and including high temps.

Molten cryolite is used to dissolve the aluminum oxide is correct.

What is electrolysis?

Electrolysis is a process used to split molecules by passing an electric current through a solution containing ions. It works because the ions in the solution are attracted to the opposite charge of the electrodes in the electrolysis cell. The ions travel towards the electrodes and are either removed from the solution (oxidation) or released into it (reduction). This process is used in a variety of industries, such as metals refining, wastewater treatment, and electroplating.

The process of extracting aluminum from its ore, usually bauxite, involves electrolysis. In this process, the ore is dissolved in molten cryolite and an electric current is passed through it, leading to the oxidation of aluminum ions at the anode and the reduction of oxygen at the cathode. The aluminum is then extracted as a molten metal.

Therefore, option C is the correct answer.

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Answer:

1. C

2. A

3. A

Explanation:

Answer:

True

Explanation:

Generally makes sense.

Answer:

250 ml

Explanation: I got it right on the lab.

The size of the volumetric flask that would you use to create a 1.25 M solution using 29.75 g of MgCl₂ is 250mL.

How do we calculate volume of the solution?

Volume (V) in liter of the solution will be calculated by using the molarity (M) formula as:

M = n/V, where

n is the moles of the solute and it will be calculated by using mass as:

n = W/M, where

W = given mass

M = molar mass

Moles of 29.75g of MgCl₂ = 29.75g / 95g/mol = 0.313 mol

Given that molarity of solution = 1.25M

On putting values on the equation of molarity we will get the value of volume as:

V = 0.313 / 1.25 =  0.2504 L = 250mL

For the preparation of 250 mL of MgCl₂ solution we required the volumetric flask of 250 mL.

Hence volumetric flask of 250mL is required.

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Answer:

the atom is held together by the electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it, the stability within chemical bonds is also due to electrostatic attractions.

Explanation:

Answer:

Some type of bond (example: hydrogen bonds between water)

Polarity can also hold atoms together

hope this Helped!

Answer:

4s, 3d, 4p

Explanation:

(3d,4s,4p) and (4p, 3d, 4s) both are decreasing energy, while (4s,4p,3d) is incorrect order it should be (4s,3d,4p).

Answer:

2200 degrees Fahrenheit

Explanation:

700°C to 1300C where's my points at

Answer:

it disappeared loll jk

it obviously dried

well you may Mark me as brainliest

Answer:

To remove waste products

Explanation:

I think

Answer:

to remove waste products

Answer:

In a solid, they're really close together and vibrate a LITTLE, in a liquid they're kinda close together but change movement because water will change shape depending on the container they're in. For gas they are spread far from each other and vibrate A LOT

Explanation:

Answer:

answer

Explanation:

explination

Answer:

2 electrons will move from magnesium to oxygen

Explanation:

Valence electrons have higher energy than the electrons in inner orbits, valence electrons participate in chemical reactions. A certain element's chemical characteristics can also be determined by the quantity of valence electrons that are present. The correct option is C.

The amount of electrons an atom must gain or lose in order to achieve the electrical configuration of the nearby noble gas or inert gas is known as valence. "Valence electrons" are described as "non-filled electrons in the outer shells."

The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are minuscule subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.

'Mg' has two valence electrons and 'O' has six valence electrons. So 'Mg' loses its two electrons to 'O' to attain the octet.

Thus the correct option is C.

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