na+F2-> naF a chemical reaction. the synthesis of sodium fluoride noF is shown above all chemical reactions involve a change to an atoms number of protons neutrons electrons

Answer:

D.) Atoms.

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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.

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

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

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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Answer:

A group is a vertical row on the periodic table and a period is a horizontal row on the periodic table.

Explanation:

Answer:

A group on the periodic table refers to the vertical arrangement of the elements while a period refers to the horizontal rows of elements

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

Answer:

That has no fixed shape but it have fixed volume.

Answer: Gravity i think

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.

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.

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

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Answer:

One gallon of muriatic acid

Explanation:

i think

As a chemist, the classification of substances as elements, mixtures, or compounds is of more importance than the state of the substances.

The state of substances is mostly obvious to the eyes, even to those that are not chemists. In other words, the state of matter of substances is just a physical property that can be easily discerned.

Whether a substance is an element, mixture, or compound, however, is something that may not be discerned physically without carrying out some chemical analyses.

Thus, a chemist would be more interested in the classification of substances as elements, compounds, or mixtures.

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Answer:

0

Explanation:

Answer:

The number of electrons, in turn, determines the chemical properties of the atom.

Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element.

Electrons have a negative charge. Since the atom is electrically neutral, the number of electrons must equal the number of protons.

The electrons arrange themselves in energy levels around the nucleus. The outermost or valence electrons of an atom are the ones that take part in chemical reactions. An element’s chemical properties depend on its valence electrons.

Explanation:

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.

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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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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Answer:

Atomic mass

Explanation:

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

Answer: Substances giving off heat and light, themselves, is always chemical. What we see in the sky are new colors and light. 1. Changing the size and shapes of pieces of wood would be a chemical change. 2. In a physical change, the makeup of matter is changed.

Explanation:

Answer:

The periodic table is also split into four blocks: s = red, p = green, d = yellow, and f = blue.

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

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Answer:

The coeffeceient

Explanation:

Answer:

non metals are elements and elements are pure substances

Explanation:

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

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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Answer:

Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

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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