How many moles in 5.75 x 1024 atoms of copper (Cu)? (9.55 mol)

Explanation:

Chlorine is a non metal so covalent bond. KBr has K metal and Br non metal of opp. charges so ionic bond. Na is a metal so ionic bond. NaCl has Na as metal and Cl as a non metal so ionic bond.

D is incorrect

Answer:

3.5 mol/L

Explanation:

First convert the 139.9g of LiCl into moles of LiCl.  Don't do the sig fig rule until the very end.

Second, take 930mL of LiCl and divide it by 1000 to convert it to liters.

Third use the molarity formula which is M=mol/L and divide 0.930L by 3.300773877mol and you will get 3.549219223.  This is where the sig fig rule will come into play.  3.5mol/L is a reasonable answer for this problem.

The amount of Mg(OH)2  present after the reaction is complete is 0.136 moles of Mg(OH)2.

The equation of the reaction is;

2HNO3(aq) + Mg(OH)2(aq) -------> Mg(NO3)2(aq) + 2H2O(l)

Number of moles of Mg(OH)2 = 8.00 g/58 g/mol = 0.138 moles

Number of moles of HNO3 = 0.205 M × 24.2 mL/1000 = 0.00496 moles

Given that;

2 moles of HNO3 reacts with 1 mole of Mg(OH)2

0.00496 moles of HNO3 reacts with 0.00496 moles ×  1 mole /2 moles = 0.00248 moles of Mg(OH)2

Hence, Mg(OH)2 is the reactant in excess.

The amount of Mg(OH)2 remaining = Amount present - Amount reacted

Hence; 0.138 moles - 0.00248 moles = 0.136 moles of Mg(OH)2

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The balanced equation for the production of water from hydrogen gas is

2H₂   +   O₂   →    2H₂O

Based on the balanced equation, for every mole of hydrogen, a mole of water is produced.

∴ Since the moles of water = 25 moles

25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.

Stoichiometry is an important concept which helps us use the balanced chemical equation to measures the amount of reactants and products.

The balanced chemical equation is the equation in which the number of atoms on the left hand side that is reactant side is equal to the number of atoms on the right hand side that is product side in an equation.

First we have to write the Balanced chemical equation

2H₂ + O₂ → 2H₂O

To produce 2 moles of water, 2 moles of hydrogen are required to produce 25 moles of water.

According to the Stoichiometry

[tex]\frac{2\ \text{moles of}\ H_2}{2\ \text{moles of}\ H_2O} \times 25\ \text{moles of}\ H_2O[/tex]

= 25 moles of hydrogen gas is required

Thus, from above conclusion we can say that 25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.

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Answer:

The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:

shiny.

soft.

silvery.

highly reactive at standard temperature and pressure.

readily lose their outermost electron to form cations with a charge of +1.

Explanation:

have a great day

Answer:

The velocity is zero

The interpretation of a position-time graph is required.

The correct option is The velocity is zero.

In a position time graph the y axis denotes the position and x axis denotes the time.

A horizontal line where [tex]y\neq 0[/tex].

This means that the points of the line will be for some value of x, the y value will always be constant.

The slope of a position-time graph will gives the velocity of the object.

Slope is given by

[tex]m=\dfrac{\Delta y}{\Delta x}[/tex]

Here, since the graph is a horizontal line, [tex]\Delta y=0[/tex]

[tex]\Rightarrow m=\dfrac{0}{\Delta x}=0[/tex]

The velocity of the person will be zero.

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Answer:

1.2044x10^24 atoms

Explanation:

one mole of any element has 6.022x10^23 atoms

so 2 moles is just multiplying avogadros number by 2

2 x ( 6.022x10^23)= 1.2044x10^24 atoms

Greenhouse gases such as N2O, CO2 and CH4 absorb heat. However, CH4 absorbs more heat than CO2 hence its emission must be controlled.

Green house gases are gases that when released into the atmosphere, can absorb infrared radiation and prevent it from escaping into outer space. This causes the temperature of the earth to increase steadily. Lately, the concentration of the greenhouse gases in the atmosphere has increased owing to anthropogenic activities such as burning of fossil fuels.

Green house gases include; N2O, CO2, CH4 etc. However, CH4 is capable of absorbing even greater heat than CO2. This makes it even more imperative to control the emission of methane gas.

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Answer:Infection with a pathogen does not necessarily lead to disease. Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease occurs when the cells in your body are damaged as a result of infection and signs and symptoms of an illness appear.

Explanation:

Answer:

helium

(He)

Explanation:

helium

(He)

Answer:

lattices

Explanation:

Ionic compounds are crystalline solids under normal conditions, have high melting points, and form lattices at the macroscopic level. Almost all of these solids dissolve in water and conduct electricity when dissolved. These substances are known as electrolytes because they can conduct electricity when in solution.

hope this helps

Answer:

m = 3.65 gram

Explanation:

ácido clorhídrico = HCl

M = m/Mr × 1000/mL

0.2 M = m/36.5 gr/mol × 1000/500 mL

0.2 M = m/36.5 gr/mol × 2

m/36.5 gr/mol = 0.2 M/2/L

m/36.5 gr/mol = 0.1 mol

m = 36.5 gr/mol × 0.1 mol

m = 3.65 gram

Answer:

option B it was captured by earth's gravity

Explanation:

please Brinlmark me please

Answer:

A) Oxygen

Explanation:

i just took the test.

Answer:

D

Explanation:

If your choices are:

a) Substrate analog

b) Protein kinase

c) Allosteric effector

d) Both (b) and (c).

then your answer is D :)

Answer:

Fertilization

Explanation:

Fertilization occurs when the nucleus of both a sperm and an egg fuse to form a diploid cell, known as zygote. The successful fusion of gametes forms a new organism.

Answer:

Atomic number (smaller number) =number of protons or number of electrons

mass number ( larger number) =number of protons plus the number of neutrons

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option C.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

In the given molecule NH₃, the subscript 3 that is written on the foot of element represents the number of hydrogen atoms in each molecule of ammonia.

Therefore, the correct option is option C.

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Answer: Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point. For the elements, color does not vary much from one element to the next

Answer:

Physical properties of matter include;

[tex].[/tex]

Answer:

exposure to the sun (heat and light) for long period of time and air (oxygen reacts with particles)

The characteristics of the reactivity of the periodic table allows to find the correct answers to the different questions are:

1) Metals on the right have more protons, causing valence electrons to be held more strongly.

2) They are very nonreactive.

3) Na and Br

4) Rb loses an electron

1) The reactivity of a chemical element is the tendency to combine with others, this increases as it has fewer electrons in its last layer and since they are more weakly bonded.

Consequently, halogens have seven electrons in their last shell tends to attract an electron to remain with the full level and the alkaline that an electron has in the last shell tends to lose the electron to remain with a complete shell.

If we examine the periodic table the number of electrons in the last shell decreases from right to left.

Let's review the different claims:

a) False. The elements on the right side have a higher atomic number, therefore more protons.

b) True. The elements have more protons therefore it has to attract other electrons and the reactivity decreases.

c) False. As it has more electrons, it has more energy levels, losing all the electrooens is more difficult, so the reactivity decreases.

d) False. By having more electrons it has more energy levels.

2) What is the unique characteristic of the elements of group 18

The elements of group 18 are the noble gases, they have their last full layer therefore they do not have.

the correct answer is:  They are very nonreactive.

3) The reactivity in the period table decreases with increasing period therefore the element of period 3 is the most reactive in this case Sodium and Halogen of group 5 is the most reactive in this case Bromine.

the compound Na and Br is the most reactive of all.

4) Rubidium has 1 electron in its last shell, both in a chemical reaction pole loses the electron.

the correct answer is: Rb loses an electron

In conclusion, using the characteristics of the reactivity of the periodic table, we can answer the different questions..

      1) Metals on the right have more protons, causing valence electrons to be held more strongly.

      2) They are very nonreactive.

      3) Na and Br

      4) Rb loses an electron

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The whole Patterns of Reactivity Quick Check for Honors Chemistry is

1) B. Metals on the right have more protons, causing valence electrons to be held more strongly.

2) B. by gaining electrons

3) B. They are very nonreactive

4) A. Cs and Br

5) A. Rb loses an electron

The quantities that vary in the isotopes of the same element is number of nucleons and the number of neutrons.

Isotopes are atoms of the same element that have different numbers of neutrons. The number of protons and electrons in isotopes of an element remains the same because they determine the element's chemical properties.

Nucleons refers to the collective number of protons and the neutrons present inside the nucleus. Isotopes can have different physical properties due to the varying number of neutrons.

Therefore, the isotopes differ in the quantity of number of neutrons and the nucleons present.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{4.36 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 72.425249[/tex]

We have the final answer as

Hope this helps you

Answer:

ATP

Explanation:

Answer:

mercury and gallium are two metals that are found in liquid state at NTP.

Answer:

b

Explanation:

deposition is the differentiates weathering from erosion

Answer:

nosé

Explanation:

wadsdfc evdcaedc<dc

Answer:

second one

Explanation: