Can someone please tell me the answer on this. First person to answer will most definitely be marked brainliest so please just tell me the answer. The deadline is in 5 MINUTES!!

Answer:

11

Explanation:

because jrjrbd kiubsk luvs jd8uga

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:Reigns then hit two Superman punches and a spear to score the pinfall. Result: Roman Reigns defeated John Cena via pinfall to retain the title.

Explanation:

Answer: Roman Reigns I hope this helps

Explanation:

Eleven matches were contested at the event, including one match on the Kickoff pre-show. In the main event, Roman Reigns defeated John Cena to retain SmackDown's Universal Championship.

Answer:

0

Explanation:

Explanation:

more predators, less deers. also starvation, and diseases.

Answer:

I know someone that has the answer

Explanation:

I know someone that has the answer

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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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

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Answer:

[tex]\huge\boxed{\sf Q = 5880\ Joules}[/tex]

Explanation:

Given:

m = mass = 40 g = 0.04 kg

c = specific heat constant of water = 4200 J/Kg°C

ΔT = change in temperature = T2-T1 = 60 °C - 25 °C = 35°C

Required:

Q = change in heat energy = ?

Formula:

Q = mcΔT

Solution:

Q = (0.04)(4200)(35)

Q = 5880 Joules

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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:

I think it's true

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:

94448421.2201

Explanation:

multiply the value in kilometers by the conversion factor '0.62137119223684'.

So, 152000 kilometers = 152000 × 0.62137119223684 = 94448.42122 miles.

Answer:

Argon, neon, krypton, Xenon, Radon and Organesson

The most likely ion of Aluminum is Al³⁺ (group 3A) since losing three electrons is the most energetically favorable way for it to follow the octet rule.

Because the charge on ions is equivalent to their oxidation state, then +3 is the most likely oxidation number of Aluminum.

Answer:

an article or substance that is manufactured or refined for sale. or a thing or person that is the result of an action or process.

Explanation:

Answer:

product is the item offered for sale. A product can be a service or an item. It can be physical or in virtual or cyber form. Every product is made at a cost and each is sold at a price. The price that can be charged depends on the market, the quality, the marketing and the segment that is targeted.

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

Answer:

Phosphorus ( white) us highly reactive and ignites at about 30°C when exposed to moist air

Ionic solutions are known to be electrolytes due to the presence of free ions. Covalent solutions are non-electrolytes hence the decrease the conductivity of the ionic solutions.

Electrolytes are solutions that conduct electricity. The charge carriers in solution are ions. These ions are mobile. Covalent substances are molecular in nature. They do not contain ions hence they do not give ions when dissolved in water.

The conductivity of ionic solutions owes to the presence of ions in solution. The higher the concentration of ions in solution, the greater the conductivity of the solution. When covalent substances are mixed with ionic solutions, the concentration of ions decreases and the conductivity of the solution decreases.

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Answer:

No

Explanation:

The same amount of matter is present before and after chemical and physical changes. Matter cannot be created or destroyed

Answer:

none is created or destroyed. This concept is called the Law of Conservation of Mass.

Answer:

NH4Br and NH4I are both soluble in water, and they don't react with each other. So this pair will not form precipitation.

NaClO4 and (NH4)2S are both soluble in water.  While in water, they dissociate into Na+, ClO4-, NH4+ and S2- ions, which don't react with each other.  So this pair will not form precipitation.

Ni(NO3)2 and Na2CO3 are both soluble in water.  When the 2 solutions combine, NiCO3 forms.  NiCO3 is not soluble in water, so it will precipitate out from the solution. This pair will result in precipitation.

K2SO4 and Cu(NO3)2 are both soluble in water. While in water, they dissociate into K+, SO42-, Cu2+ and NO3- ions, which don't react with each other.  So this pair will not form precipitation.

Explanation:

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Answer:

Democritus was the first person to hypothesize the existence of atoms (the idea that you can't keep dividing matter forever). Scientists did eventually prove the existence of atoms. however, they aren't completley how he imagined them.

Answer:

Niels Bohr

Explanation:

Answer:

Explanation:

I'm not sure what is being asked, not the units of "1.5."  I don't know of potassium "ioxicide."  Was "dioxide" intended?

I'll assume the question is "What is the concentration, in Molar, of 1.5g of potassium dioxide in 150cm^3 of water (150cm^3 is 150 ml).

The molar mass of K2O, potassium dioxide, is 94.2 g/mole.  1.5g is (1.5g/94.2 g/mole) or 0.0159 moles of K2O.  The definition of Molar is moles/liter.  So take the moles of K2O and divide by the liters, which is 0.150L in this case.

(0.0159 moles K2)/0.150 L  = 0.106 M K2O

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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