Group 17 is called the halogen family, and the group to its right is called the noble gases. How are the elements in these groups alike and how are they different?

Answer: A mixture is when two or more substances combine physically together. However, in water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone. Therefore, water is not a mixture; it is a compound and it is pure. A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure. B Because its composition is not uniform throughout, orange juice is a heterogeneous mixture. A Aluminum oxide is a single, chemically pure compound. A Selenium is one of the known elements.

Hope this helps :)

Answer:

The forces are unbalanced, so there is net force on the hunter.

Explanation:

To know which option is correct, we shall determine the net force acting on the hunter.

From the question given above, the following data were obtained:

Force applied by Emilio (F₁) = 250 N

Force applied by Patrick (F₂) = 310 N

Force of gravity (F₉) = 520 N

Next, we shall determine the total force applied in lifting the hunter. This can be obtained as follow:

Force applied by Emilio (F₁) = 250 N

Force applied by Patrick (F₂) = 310 N

Total force applied (Fₜ) =?

Fₜ = F₁ + F₂

Fₜ = 250 + 310

Fₜ = 560 N

Finally, we shall determine the net force acting on the hunter. This can be obtained as follow:

Force of gravity (F₉) = 520 N

Total force applied (Fₜ) = 560 N

Net force (Fₙ) =?

Fₙ = Fₜ – F₉

Fₙ = 560 – 520

Fₙ = 40 N

Thus the net force acting on the hunter is 40 N

From the calculations made above, we can see that the net force acting on the hunter is 40 N.

Therefore, the correct answer to the question is:

The forces are unbalanced, so there is net force on the hunter.

Answer:

yes it was a one in four chance

Explanation:

Answer:

Number of protons = 82

Explanation:

Given data:

Atomic number of Pb = 82

Mass number of Pb-207 = 207

Number of protons = ?

Solution:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Atomic number of Pb = number of protons or electrons

82 = number of protons or electrons

Mass number = Number of protons + number of neutron

207 = 82 + number of neutron

Number of neutrons = 207 - 82

Number of neutrons = 125

Answer:

F

Explanation:

nonmetal doesn't conduct, is shiny and silver and is solid. Hope this helps :)

Answer:

The periodic table is useful today for finding out all the elements that exists on Earth. The elements there can be used to write down chemical formulas, calculate things like molar mass/atomic mass of each element, atomic number for each, number of valence electrons each element has, the oxidation number for each, etc. Lastly, it can be used to predict the properties of elements yet to be discovered.

Explanation:

Hope it helped!

Answer:

100 moles of KMnO₄ contain 602.2 × 10²³ formula units.

Explanation:

Given data:

Number of moles of KMnO₄ = 100 mol

Number of formula units = ?

Solution:

The given problem will be solved through Avogadro number.

1 mole contain = 6.022 × 10²³ formula units

100 mol  × 6.022 × 10²³ formula units / 1 mol

602.2 × 10²³ formula units

Thus, 100 moles of KMnO₄ contain 602.2 × 10²³ formula units.

Answer:

31.64...

Explanation:

The formula is volume is equal to mass over density.

So 25/0.79=31.64...

The volume of ethyl alcohol is 31.645mL.

Volume is the amount of space the matter occupies.

Ethyl alcohol is a clear, colourless liquid and the main ingredient in alcoholic beverages.

Density = mass/volume

D = m/v

v x D = m

On multiply both sides by D,

 v x D/D = m/D

            v = m/D

               = 25g/0.79g/mL

               = 31.645mL

Hence, the volume of ethyl alcohol is 31.645mL.

To learn more about volume and ethyl alcohol here

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Answer:

The answer is B!

Explanation:

Answer:

B

Explanation:

Answer:b

Explanation:

don’t listen to the guy in the comments

The element contains 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number).

The atomic number for any component exists as the number of protons in its atomic nuclei. In a neutral atom, the number of electrons exists exactly as the number of protons. The atomic mass (mass number) exists as the totality of the protons and neutrons in the nucleus. The mass number can change due to the particular that the number of neutrons can vary. Isotopes exists called for their mass numbers.

So, this element contains 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number).

This isotope exists phosphorus - 31, which contains atomic number 15.

Therefore, the correct answer is option B. 15 protons, 16 neutrons, and 15 electrons.

To learn more about protons, neutrons and electrons refer to:

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Answer:

Convection currents are caused by the movement of the magma in the mantle.

Explanation:

Answer:

correct

Explanation:

thanks for being a smarty pants

Hi there,

My answer would be False.

Please mark

Thanks

The statement is false that if one person reacts to something in a certain way, that means ALL people will react to the same situation in the same way (Johnny gets stung by a bee, now he kills every bee he sees).

According to this question, if one person reacts to something in a certain way, that means ALL people will react to the same situation in the same way.

An example then states that Johnny gets stung by a bee and begins to kill every bee he sees.

This statement is false because when Johnny gets stung by a bee, everyone should react to the situation the same way Johny Johnny did.

Learn more about false statements at: https://brainly.com/question/24701431

Answer:

B. Convection oven

Explanation:

The following are all in a kitchen tool category;

I. Measuring: this includes tools such as tapes, scale (balance), graded-cup, teaspoon, which are used for taking measurements of food items in the kitchen.

II. Food preparation: it comprises of various tools used in the kitchen for the preparation of food. This includes pots, cooker, spoon, turner etc.

III. Cutting: these are tools used for cutting food items and it include knives, chopping board, grinder etc.

A convection oven is typically designed and developed with multiple fans for circulation of air and as such it is used for baking. It is mainly used in big industries and restaurants.

The mass of an atom is given by the sum of the number of PROTONS and the number of NEUTRONS since ELETRON'S mass is negligible.

The mass is 24+28 = 52.

Answer:

0.54 moles of N2

Explanation:

First remember to find the volume in moles, 1 mole equals 22.4 liters.

So now use the dimensional analysis to show your work.

12 liters of N2 *  1 mol /22.4 liters of N2

Now calculate this. 12 * 1/22.4 or 12/ 22.4

12/22.4 = 0.535714286.

12 has two significant digits.

With that, The answer rounds to 0.54.

So that the final answer is 0.54 moles.

Hope it helped!

Answer:

I. Concrete sidewalks

Explanation:

One of the factor that affects the infiltration of water into the surface of the soil is the use of concrete sidewalks.

Concrete is impermeable and non - porous media

When concrete pavements are used, water will not be able to move into the ground. They run on the surface and collects into nearby streams and water bodies.

Answer:

A

Explanation:

When the strip of silver is heated, the silver particles move farther apart.

Answer: true

Explanation:

4. describe three ways carbon dioxide was removed from the Earth's atmosphere.

Answer: Forests: Photosynthisis helps clear carbon dioxide naturally, Soils naturally store carbon, but agricultural soils are running a big deficit due to intensive use. Because agricultural land is so expansive, Bio-energy with Carbon Capture and Storage (BECCS) is another way to use photosynthesis to combat climate change. However, it is far more complicated than planting trees or managing soils — and it doesn’t always work for the climate.

5. Explain why there is now 21% Oxygen in the Earth's atomosphere compaired to little or no Oxygen in the Earth's atmosphere 4.5 billion years ago.

Answer: cientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.

Sorry its soooo long TwT

uhm they use gas/fuel to run

Answer:

Blank 1: 1

Blank 2: 1

Blank 3: 2

Explanation:

I think the question is like this __Na2O +___H2O =___NaOH

I used "á" this word as equal sign. Is there any wrong with that?

Answer:

Density = 0.32g/mL

Explanation:

Density of a substance can be calculated using the formula:

Density (g/mL) = mass (g)/volume (mL)

According to the information provided in this question, mass of the substance = 80grams, volume = 250cm³/mL

Note that, the pressure and temperature are not needed to calculate the density of the substance.

Density = 80/250

Density = 0.32g/mL

Answer:

The atomic mass of each element is listed below the symbol of the element in the periodic table: Cu =

63.55 amu, Hg = 200.59 amu, S = 32.07 amu, and He = 4.00 amu. The mass of Avogadro’s number of atoms

is the atomic mass expressed in grams. Therefore, 6.02 × 1023 a

Explanation:

Answer:

K₅Mn₅O₁₆

Explanation:

From the question given above, the following data were obtained:

Potassium (K) = 27.5 %

Manganese (Mn) = 37.5 %

Oxygen (O) = 35 %

Empirical formula =?

The empirical formula for the compound can be obtained as follow:

K = 27.5 %

Mn = 37.5 %

O = 35 %

Divide by their molar mass

K = 27.5 / 39 = 0.705

Mn = 37.5 / 55 = 0.682

O = 35 / 16 = 2.188

Divide by the smallest

K = 0.705 / 0.682 = 1

Mn = 0.682 / 0.682 = 1

O = 2.188 / 0.682 = 3.2 = 32/10 = 16/5

K = 1

Mn = 1

O = 16/5

Multiply by 5 to express in whole number

K = 1 × 5 = 5

Mn = 1 × 5 = 5

O = 16/5 × 5 =16

Thus, the empirical formula for the compound is K₅Mn₅O₁₆

Answer:

If your lab has litmus paper, you can use it to determine your solution's pH. When you place a drop of a solution on the litmus paper, the paper changes color based on the pH of the solution. Once the color changes, you can compare it to the color chart on the paper's package to find the pH.

Explanation:

A solution's pH will be a number between 0 and 14. A solution with a pH of 7 is classified as neutral. If the pH is lower than 7, the solution is acidic. When pH is higher than 7, the solution is basic. These numbers describe the concentration of hydrogen ions in the solution and increase on a negative logarithmic scale.

For example, If Solution A has a pH of 3 and Solution B has a pH of 1, then Solution B has 100 times as many hydrogen ions than A and is therefore 100 times more acidic.

Answer:

calcium chloride and silver nitrate

Explanation:

A precipitate is often formed in a double replacement reaction when the reaction yields an insoluble product.

Consider the reaction between calcium chloride and silver nitrate;

CaCl2(aq) + 2AgNO3(aq) -------->2AgCl(s) + Ca(NO3)2(aq)

AgCl is insoluble in water, hence the reaction leads to the formation of a precipitate.