Chemistry High School

Who is the Father of the Periodic Table?​

Answers

Answer 1

Answer:

Dmitri Ivanovich Mendeleev

Explanation:

Answer 2

Answer:

Dmitri Mendeleev

Explanation:

Related Questions

I'll mark brainly pls help

Answers

I feel bad that nobody answered

A space that is totally empty without any matter is called​

Answers

It’s called a vacuum

Is vegetable soup a homogeneous or heterogeneous mixture

Answers

Answer:

heterogeneous

Explanation:

have you ever started to eat veg soup and begin with a spoon full of broth, no veggies,

Then when you get to the end, there are veggies. no broth.

In a homogeneous  mixture, every sample is the same

in a heterogeneous mixture, the composition changes from sample to sample

An atom has 7 protons, 8 electrons, and 7 neutrons. What is the charge of the
atom and what type of ion is it?

Answers

Answer: An atom containing 7 protons, 8 neutrons, and 7 electrons is charge-neutral.

Explanation:

An atom is composed of protons (positively charged), neutrons (no charge) and electrons (negatively charged). The excess or defect of electrons in relation to protons determines the charge of an atom.

The atom described is an anion with -1 charge as it has one extra electron than protons.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Could someone please help me

Answers

Answer:

Whistle 2 has a lower pitch, but is louder.

Whistle 3 has higher pitch and is less loud.

Explanation:

The more frequent the arches are the higher the pitch.

The larger the amplitude the louder the sound is.

;D

household substances that contains acid​

Answers

Answer:

milk, lemon juice, toothpaste and baking soda

Soraya left some soup in the refrigerator. She looked at the soup every day, but she always decided not to eat it. After five days, she started to see mold growing on the surface of the soup. She looked up mold online and found that mold is made of fungal cells. Why didn't Soraya see the mold growing on the soup before the fifth day? Why can she see it now? ​

Answers

Explanation:

In general, the longer that moisture is present, the greater the chance for mold to grow and spread. When mold spores encounter a moist surface, it starts growing within a few hours, spreading into the material while also filling the air with thousands of mold spores.

5 Facts about Geology

Answers

1-There are 18 volcanoes in the US with the potential to erupt again, all of them in Alaska, Hawaii and the West Coast states.

2-Rubies and sapphires are actually the same mineral - corundum. The basic chemical formula of corundum is Al2O3, but traces of iron stain the mineral red (ruby) while traces of chromium or titanium stain the mineral blue (sapphire).

3-Rubies, sapphires and emeralds are all more rare than diamonds.

4-Not all diamonds are transparent. They come in a variety of colors (called "fancies"), including yellow, green, blue, orange, brown ("champagne"), purple, grey, black (called carbanado, recently shown to be meteroic), milky white, pink, and red. Red is by far the rarest.

5-Antacids taste like chalk because they ARE chalk, a.k.a. calcium carbonate.


Hope this helps, Give a thanks ! Haha

any push or pull is called
​

Answers

Answer:

A Force.

Explanation:

A force is a push or pull upon an object resulting from the object's interaction with another object. ... Forces only exist as a result of an interaction.

True or false when heat is added to atoms the molecules vibrate much more slowly

Answers

Answer:

false

Explanation:

The particles are held together too strongly to allow movement from place to place but the particles do vibrate about their position in the structure. With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly

atoms from different element combine to form

Answers

I think the answer is a new substance

Answer:

new substances

Explanation:

Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.

Which set of substances contains only compounds?

Answers

Answer:

non metals are elements and elements are pure substances

Explanation:

The density of a liquid is 6.0g/cm3 , when it fills a container of volume 300cubic centimeters . What is the mass of the liquid in the container?

Answers

Answer:

1800g

Explanation:

b/c d=m/v

m=dv

m=300×6=1800g

The mass of the liquid in the container is equal to 1800 g.

What is the density?

The density of an object can be described as the mass per unit volume of the object. The average density of any substance equals the total mass of the substance divided by its total volume.

The mathematical formula of the density can be expressed as follows:

The density of material = Mass/Volume

Mass = density × Volume

The S.I. unit of the density of any substance is Kg/m³ and it is an intrinsic property. If the size of the substance increases, the mass increases as well but the density of the substance will stay constant.

Give, the density of the liquid, d = 6.0 g/cm³

The volume of the container, V = 300 cm³

The mass of the liquid = 6 ×300 = 1800 g

Therefore, the mass of the liquid is equal to 1800 g.

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According to Democritus, which substance cannot be divided?
O A. molecules
O B. matter
O C. compounds
OD. atoms

Answers

Answer:

D.) Atoms.

I hope this helps! :)

1. A unit of mass used to express atomic and molecular weights. One proton or
neutron equals one mass unit.

Atom

Atomic mass

Nucleus

Amy

Protons

Neutrons

Uranium

Electrons

Hydrogen

Answers

Answer:

Atomic mass

Explanation:

It is the unit used o express atomic and molecular weights.

a space probe identifies a new element in a sample collected from an asteroid. successive ionization energies, in attojoules per atom, for the new element are given in the table. i1 i2 i3 i4 i5 i6 i7 0.507 1.017 4.108 5.074 6.147 7.903 8.294 to what family of the periodic table does this new element probably belong?

Answers

The element belongs to group 17 of the periodic table.

In the periodic table, elements are arranged in groups depending on their properties. Usually, elements whose atoms have the same number of valence electrons are placed in the same group.

All the elements in group 17 have seven electrons on their outermost shell. Since an ionization energies of the electrons on the valence shell of an atom are always close together, the ionization energies of the seven electrons as shown indicate that they must be on the same shell.

Hence, the new element must be a member of group 17 of the periodic table.

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a car is parked along a level road identify the forces that act upon the car

Answers

Answer: Gravity i think

Write Cadmium nitride formula using criss cross method

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Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here calcium is having an oxidation state of +2 called as Ca^{2+}Ca2+ cation and NO_3^{-}NO3− is a polyatomic anion with oxidation state of -1.. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral Ca(NO_3)_2Ca(NO3)2

In 6CH4, we have 6 molecules of CH4. What is the 6 called?

Answers

Answer:

The coeffeceient

Explanation:

Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in. Is this true or false

Answers

Answer:

what do you mean?

Explanation:

Studying the brightness of a star can indeed help scientists determine what part of the life-cycle a star is in. The brightness of a star is directly related to its stage in the life cycle.The statement is true.

During the early stages of a star's life, it is formed from a cloud of gas and dust. As the star contracts under its own gravity, it starts to heat up and emits light. This is known as the protostar stage.

As the star continues to contract, it reaches a point where the core temperature becomes hot enough for nuclear fusion to occur. At this stage, the star enters the main sequence phase, where it will spend the majority of its life. The brightness of the star in this phase is determined by its mass. More massive stars are brighter than less massive ones.

As the star ages, it exhausts its hydrogen fuel in the core and begins to evolve. Depending on its mass, a star can become a red giant, a white dwarf, a neutron star, or even a black hole. Each of these stages has a different brightness profile.

By observing the brightness of a star over time, scientists can gather information about its age, mass, and evolutionary stage. This can provide insights into the star's life cycle and help in understanding the processes occurring within it.

Thus, studying the brightness of a star is an important tool for scientists to determine what part of the life cycle a star is in. By analyzing its brightness profile, scientists can gain valuable information about the star's age, mass, and evolutionary stage.The statement is true.

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a liquid can be described as a form of matter that

Answers

Answer:

That has no fixed shape but it have fixed volume.

Finalmente responde:

- ¿Cuáles serían las características del agua filtrada que evidencie el funcionamiento del filtrador?

– Consideras que volver a filtrar la misma muestra de agua ¿disminuye la turbidez del agua?,, AYUDAAAAAAAAA

Answers

El agua se purifica a partir de un proceso de filtrado. Las características que evidencian el filtrado incluyen pH normal, color cristalino, ausencia de metales pesados y/o microorganismos, etc.

Los filtros para purificar agua son dispositivos que permiten el limpiado del agua con el objetivo de convertirla apta para consumo humano.

En general, los filtros para lograr la purificación del agua consisten de carbón activado, el cual se prensa con alta presión.

Este dispositivo de carbón activado permite secuestrar las partículas sólidas que pasan a través del filtro, con lo cual el agua sale a través del filtro completamente purificada.

Las características que permiten determinar si el agua ha sido correctamente filtrada incluyen:

El agua sale cristalina, es decir, sin ningún tipo de color que evidencie la presencia de contaminación.El pH del agua potable debe oscilar entre valores normales (6,5 a 8,5)No debe contener metales tales como plomo, arsénico o cadmio (altamente tóxicos)No debe contener microorganismos

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based on the dosages a patient receives what level of precision should a syringe have to ensure that the patient receives the proper dosage

Answers

Answer:

No.

Explanation:

The person giving the dosage should make sure there is a proper dosage. The syringe only tells you how much there is in the syringe.

I will brainless who can answer this all pleaseeeeej​

Answers

Answer:

1. FALSE

2. TRUE

3. TRUE

4. FALSE

5. FALSE

6. TRUE

7. TRUE

8. TRUE

9. TRUE

10. TRUE

Explanation:

1. Conduction occurs more readily in solids and liquids

2. Gold is used as a contact metal in the electronics industry as it is a good conductor of both electricity and heat.

3. None

4. Radiation is the fastest mode of heat transfer while conduction is the slowest mode of heat transfer

5. Heat from Sun reaches us by the process of radiation

6. None

7. It is the motion of particles that creates a form of energy called heat (or thermal) energy that is present in all matter

8. At a temperature of 0o C, the thermal energy within a given system is also zero

9. None

10. None

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how much muriatic acid to lower alkalinity in pool

Answers

Answer:

One gallon of muriatic acid

Explanation:

i think

identify two ways in which carbon-12 carbon-13 and carbon-14 are alike

Answers

Answer:

identify two ways in which carbon-12, carbon-13, and carbon-14 are alike. they each have 6 protons and neutrons and they're all carbon atoms. what is a chemical compound?

ce cantitate se solutie NaOH de cantitate 0.2 M reactioneaza total cu 300g fenol de puritate 90%?

Answers

ANSWER:

11,000

HOPE IT HELPS YOU

CAN YOU BRAINLEST ME

a 47.0 ml aliquot of a 0.400 m stock solution must be diluted to 0.100 m. assuming the volumes are additive, how much water should be added?

Answers

Answer:

141 ml

Explanation:


What is the windward side of the sand dune

Answers

Answer:

A dunes windward side is the side where the wind is blowing and pushing material up. A dunes slip face is simply the side without wind. A slipface is usually smoother than a dunes windward side. A collection of dunes is called a dune belt or dune field.

Explanation:

Hope this helps...

why can't you balance CaC2 + H2O > Ca(OH)2 + CH4?

Answers

Answer:

Balance The Chemical Equation Cac2 H2o Ca Oh 2 C2h2 Balance the chemical equation CaC 2 + H 2 O → Ca (OH) 2 + C 2 H 2 Calcium carbide react with water to produce calcium hydroxide and acetylene.

Explanation:

CaC2 + H2O > Ca(OH)2 + CH4

Ca + 2 H2O → Ca(OH)2 + H2 - Balanced equation

What is balance equation with example?

A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia

What is the balance chemical formula?

Balanced chemical equation - A chemical equation in which the number of each type of atom is equal on the two sides of the equation. Subscripts - Part of the chemical formulas of the reactants and products that indicate the number of atoms of the preceding element.

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