1. An Element is determined by the number of ________ and it’s nuclear ( Also known as atomic number).
2. Each chemical element is made up of only one kind of...

Answer:

si

Explanation:

trye

teen

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kaisksd

Answer:

A synthesis reaction is a reaction that occurs when two or more reactants combine into one product.

Explanation:

A reaction that occurs when two or more reactants combine into one product is called a synthesis reaction.

A reaction that occurs when one element within a compound is exchanged with another element is called a single replacement reaction.

A reaction that occurs when a substance combines with molecular oxygen, releasing light and energy is called combustion.

A reaction that occurs when a single substance breaks apart and forms two or more new substances is called decomposition.

Answer:

5

Explanation:

Answer:

Explanation:

The first two are easy:

H2O, H3O+ and OH- all exist in an equilibrium

[H3O+] = [OH-] = 10^-7 M

HCl is a strong acid so 1M of it will disassociate completely

[H3O+] = [Cl-] = 1 M

The third one is also an equilibrium as HNO2 is a weak acid. Ka is given so [HNO2] and [NO2-] can be calculated.

The fourth one is a buffer solution so its pH can be looked up to give the concentrations.

Answer:

Explanation:

H20 has pH of 7

1st reaction [H30+] = 10^-7M

[OH-] = 10^-7M

1M HCl has pH of 0

2nd reaction [H3O+] = 1M

[Cl-] = 1M

given Ka = 4.6x10^-3 = [H3O+]x[NO2-] / [HNO2]

and [HNO2] + [NO2-] = 1M

each concentration can be solved

beaker D is a buffer solution n requires more info 2 solve

Answer:

It makes them splash more.

Explanation:

Answer:

Tidal force

Explanation:

The moon's gravitational pull generates the tidal force. The tidal force causes Earth, more specifically Earth's water to bulge out on the side closest and farthest from the moon. These are high tides.

hope this helps:)

Answer:

Ecosystems, the interactive system of living and nonliving organisms in a specific location, change slowly over time. When new plants and animals arrive in an area, they either thrive or struggle. Thriving species sometimes displace native species. When this happens, the system as a whole begins to change.

Answer:

rahul's weight

Explanation:

internet

The force is equal to the force Rahul exerts on Earth is Rahul's weight.

Force is that thing which cause a change in the motion of an object

So, Rahul exerts a force on the Earth equal to his weight.

Thus, the force is equal to the force Rahul exerts on Earth is Rahul's weight.

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Answer:

D

Explanation:

Answer: A

Explanation:

Answer:

Limiting reactant is FeCl3; 1.7 g of Mg remain.

Explanation:

From the question;

The equation is;

3Mg(s) + 2FeCl₃(s) → 3MgCl₂(s) + 2Fe(s)

Amount of Mg = 41 g/24.31 g/mol = 1.687 moles

The limiting reactant yields the least amount of MgCl2

3 moles of Mg yields 3 moles of MgCl2

Hence 1.687 moles of Mg yields yields 1.687 moles of MgCl2

FeCl₃ = 175 g/162.2 g/mol = 1.0789 moles

2 moles of FeCl3 yields 3 moles of MgCl2

1.0789  moles of FeCl3 yields 1.0789  * 3/2 = 1.61835 moles of MgCl2

Hence FeCl3 is the limiting reactant

3 moles of Mg reacts with 2 moles of FeCl3

x moles of Mg reacts with 1.0789  of FeCl3

x = 3 * 1.0789  /2 = 1.61835 moles of Mg

Mass of Mg reacted = 1.61835 moles * 24.31 = 39.342 g

Mass of excess Mg = 41 g - 39.342 g = 1.7 g

Answer:

hi

Explanation:

Answer:

0.0038 mole s-1

Explanation:

La velocidad de una reacción se refiere a la rapidez o la lentitud con que avanza una reacción. Se mide por la cantidad de reactivos que desaparecen por unidad de tiempo o por la cantidad de productos que aparecen por unidad de tiempo.

Número de moles de zinc = 5g / 65.37gmol-1 = 0.076 moles

Velocidad de reacción = 0.076 moles - 0 moles / 20 s - 0s = 0.0038 mole s-1

Answer:

Final temperature, T2 = 381.28°C

Explanation:

Given the following data;

Mass = 6.23 g

Initial temperature = 30.4°C

Heat capacity = 282 J

Specific heat capacity = 0.129 J/g°C

To find the final temperature;

Heat capacity is given by the formula;

[tex] Q = mcdt[/tex]

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

Making dt the subject of formula, we have;

[tex] dt = \frac {Q}{mc} [/tex]

Substituting into the equation, we have;

[tex] dt = \frac {282}{6.23*0.129} [/tex]

[tex] dt = \frac {282}{0.8037} [/tex]

dt = 350.88°C

Now, the final temperature T2 is;

But, dt = T2 - T1

T2 = dt + T1

T2 = 350.88 + 30.4

Final temperature, T2 = 381.28°C

Answer: The concentration of given solution is 11.68 M.

Explanation:

Given: Mass of solute = 10 g

Volume of solution = 25 mL

Convert mL into L as follows.

[tex]1 mL = 0.001 L\\25 mL = 25 mL \times \frac{0.001}{1 mL}\\= 0.025 L[/tex]

Number of moles is the mass of substance divided by its molar mass. The moles of sugar (molar mass = 342.3 g/mol) is as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{10 g}{342.3 g/mol}\\= 0.0292 mol[/tex]

Molarity is the number of moles of solute present in a liter of solution.

Hence, concentration of given solution is calculated as follows.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.0292 mol}{0.025 L}\\= 11.68 M[/tex]

Thus, we can conclude that the concentration of given solution is 11.68 M.

Scientific processes are the steps that are done to research and draw conclusions. The results of the experiments are the proposed answer to a question. Thus, option 4 is correct.

The scientific process initiates when there is a question that needs to answer and presented with observations and facts. It includes defining the question and making observations.

From the observations, the hypothesis is formed and an experiment is designed and conducted. From the research, the conclusion and the results are drawn.

Therefore, option 4. the proposed answer is called the result.

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Answer:

Hypothesis

Explanation:

Hypothesis is an educated guess as to what the answer to the question is.

(*) Sorry for my late answer but I hope this helps others that are looking for this.

I got 100%   ;)

Answer: Employments of friction based electricity incorporate contamination control, Xerox machines, and painting. They utilize the property that inverse electrical charges pull in. There are different utilizations including the properties of aversion and the making of electricity produced via friction flashes

friction based electricity is an awkwardness of electric charges inside or on the outside of a material. The charge stays until it can move away through an electric flow or electrical release.

In view of similar kinds of examinations like the one you performed, researchers had the option to set up three laws of electrical charges: Inverse charges pull in one another. Like charges repulse one another. Charged items pull in nonpartisan articles.

Answer:

Explanation:

One test for Alkenes is testing with bromine water. This test can be used to tell the difference between an Alkanes and Alkenes. On a normal, any Alkene will turn brown bromine water to colourless because the bromine reacts with the double carbon-carbon bond. Also, the reaction takes place with unsaturated compounds that contains the double carbon-carbon bonds.

Conversely, when Alkanes go through the same test, there is no reaction with bromine water.

Answer: Green.

Explanation: Because object appears to be blue in sunlight, it absorbs counter colour of blue, also orange-red colour. So, when illuminated with

red-green colour, red light is more absorbed and object appears to be green.

Answer for a apple it would be happle

xplanation:

Answer:

0,11,7,8

Explanation: hope this helps!