pls help me tell me how to do this question. i only need the answer for the first 2.pls

Answer:

This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change. To conclude, color change is a great indicator that change has occurred.

Explanation:

This is since there are examples of color change being an indicator for both of them. For instance, when you heat the blue copper(II) hydroxide solution, you'll eventually end up with a black copper oxide ( Cu O ) solution. This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change.

To conclude, color change is a great indicator that change has occurred. However, it does not tell you which type of change might have occurred. You will want to use better indicators - like release of heat - to guide you with that.

Hope that helped :)

Answer:

1. changing from liquid to gas state

Evaporation

2. the combining substances in a reaction

Reactants

3. radiation

Gamma Rays

4. slow oxidation

Rust

5. melting point of water

0˚ C (0 degrees Celsius)

6. a reaction between a substance and oxygen

Oxidation

7. pertaining to the nucleus of an atom

Nuclear

8. to fuse or join together

Fusion

9. rapid oxidation

Burning

10. heat

Thermo-

The change in liquid to gas state is called evaporation.  Evaporating a liquid will energize the molecules and converts them to the gaseous state.

A change in state or phase of a substance is called a physical change where, one state changes to the other like liquid vaporize to form gases.

Thus, first option is matching with 4th one evaporation.

The combining substances in a reaction is called reactants.

One example of radiation given here is gamma rays.

An example of slow oxidation is rusting that is the formation of red iron oxide on corroding metals.

Melting point of water is 0 ⁰C.

A reaction between a substance and oxygen is called oxidation.

A common  term pertaining to the nucleus and of an atom is nuclear.

The process of fusing or joining of two species together is called fusion.

Thermal process are involving rapid oxidation.

Heat is a form of energy where overheating anything causes burning.

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Answer:

its a

Explanation:

Answer:

The Answer is  B

Explanation:

I hope this helps ;)

The process by which the organisms give rise to offspring is defined as the reproduction. It is mainly of two types, they are sexual and asexual. The daughter cell DNA is identical to the DNA from the parent cell in asexual reproduction. The correct option is A.

The mode of reproduction in which a new offspring is produced by a single parent is defined as the asexual reproduction. The newly formed individuals are genetically and physically identical to each other. They are called the clones of their parents.

Asexual reproduction occurs in both unicellular and multicellular organisms. This process does not involve any kind of gamete fusion and there is no change in the number of chromosomes either. It will obviously inherit the same genes as the parent.

In asexual reproduction, single parent is involved, the offspring is genetically similar, and this process occurs in a very short time.

Thus the correct option is A.

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Explanation:

This is due to the reason that in case of inert gases, the outer shell is complete and it has hence maximum electronic repulsion. Moreover in case of inert gases, the atomic size is expressed in terms of Vanderwaal’s radius because, noble gases do not form covalent bonds while other form covalent bonds and hence their atomic radii is expressed in covalent radius. Generally atomic size decreases while moving from left to right in the periodic table. But in the case of noble gases, they have comparatively higher atomic size than corresponding halogens because of the reason that vanderwaal’s radii (present in noble gases) is much larger than ionic and covalent radii (present in other elements). Thus as, Vanderwaal’s radius is greater than covalent radius, the atomic size of noble gases is larger than other elements of same period.

Explanation:

d. nitrogen gas because of weak intermolecular force

Answer:

-3

Explanation:

What is the overall charge of anion that has 15 protons, 18 electrons and 17 neutrons?

ONLY CHARGED PARTICLES CONTRIBUTE TO THE OVERALL CHARGE, SO

+15 -18 = -3 OVERALL CHARGE

Remember

Total charge

Answer:

Helium is a noble gas and shares many properties with the other noble gases in the last column.

Explanation:

got it right

also it is classified as a noble gas, and hydrogen is a nonmetal so obviously they don't fit together, as the group is for alkali metals which Helium obviously isn't.

refer to the example pic for ur reference !!

Answer:

"Acids produce hydrogen ions, H+, in water. Bases produce hydroxide ions, OH-."

Explanation:

Answer:

Explanation:

Acids and bases release what kind of ions in water?

Acids release hydrogen ions,  bases release hydroxide ions.

the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid'

the monovalent anion OH− consisting of one atom of hydrogen and one of oxygen

— called also hydroxide ion

Answer:

Explanation:

Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture.

Answer: 21

Explanation:

Answer:

both have cell membranes

Explanation:

the animal cell has small  or temporary vacuoles.

animal cell does not have chloroplast or cell wall.

Answer:

Volume stays constant

Explanation:

Answer:

me

Explanation:

me

Answer:

The term matter refers to anything that occupies space and has mass.

Explanation:

Answer:matter

Explanation:

Answer:

H2 + 3N2 ⇒ 2NH3

Explanation:

Remember when balancing chemical equations you are trying to make sure that each side of the equation has a equal number of atoms, and when one sides number of atoms is odd you need to multiply to get a even number.

H2 + N2 = NH3

N = 1 × 2 = 2

H = 3 × 2 = 6

N = 2 × 1 = 2

H = 3 × 2 = 6

H2 + 3N2 ⇒ 2NH3

Hope this helps.

Answer:

9.18 L

Explanation:

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What volume of H2(g) is produced when 7.40 g Al(s) reacts at STP?

first write, then balance the equation

Al + HCl-------------> AlCl3 + H2

2Al + 6HCl-----------> 2AlCl3 + 3H2 2 MOLE  

2 moles of Al produce 3 moles of H2

Al is 7.4/27 =

0.27 moles of Al.

this will produce

0.27 X 3/2 moles of H2 =

0.41 moles of H2

PV =nRT

for STP, P = 1 atm, T = 273.2, R IS 0.082

V= (0.41) X 0.082 X 273,2/1 = 9.18 L

CHECK 1 mole of gas at STP has a volume of 22.4 L

0.41 moles then has a volume of 00.41 X 22.4L = 9.,18 L

Answer:

4) It disrupts the normal excretion of solid wastes.

Answer:

4

Explanation: Took the test

Answer:

The one you currently picked. The last one i think

Explanation:

The voltage for the equation CuCl₂ + Zn —> ZnCl₂ + Cu is -1.1 Vol.

The response is CuCl₂ + Zn —> ZnCl₂ + Cu, which means that it's miles a dry mobile battery, in which the anode, zinc reacts with chloride this is the cathode. within the dry battery cellular, the chemical power is stored in it, which converts into electrical power.

calculation:-

using an electrochemical chart;

⇒Reduction potential of Zn²⁺ = -0.76

⇒Reduction potential of Cu²⁺ = 0.34

Eo ( voltafe) = Ecathod - Eanode

                   =    -0.76 -  0.34

                   = -1.1 Volt

Measured redox potentials depend upon the capacity power of valence electrons, the concentrations of the species inside the reaction, and the temperature of the device. the reduction capacity for the opposite of the oxidation 1/2-response and opposite the signal to obtain the oxidation capability. For the oxidation half-response, Eooxidation = - Eoreduction. upload the potentials of the half-cells to get the overall trendy cellular capacity.

Reduction potential (Eo) is defined as a bent of a chemical species to be reduced by way of gaining an electron and is defined with the electrochemical reference of hydrogen.

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Answer:

Sodium chloride, I think

Explanation:

Salt's compound name is sodium chloride

Answer:  Holmium-165 = Er-165 + electron

Explanation:

Beta decay is the decay of a neutron into a proton and electron.  This will increase the number of protons in the Holmium nucleus by one, making it Er, Erbium, with the same atomic mass.  

Holmium-165 = Er-165 + electron

The mass is essentially the same, as the proton is assigned the same mass as the neutron it came from.

Answer:

24 hours of thawing it out in the fridge for every 5 pounds

Explanation:

Answer:

Explanation:

The pH scale goes from 0 to 14, where pH 7 is neutral. If the pH is above 7, the water is basic; if it is below 7 the water is acid. The optimum pH for pool water is 7.4, since this is the same as the pH in human eyes and mucous membranes. A pH of 7.4 also gives good chlorine disinfection.

Answer:C

Explanation:

Answer:

mole

Originally, a mole was the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. That number of particles is Avogadro's Number, which is roughly 6.02x1023. A mole of carbon atoms is 6.02x1023 carbon atoms.

Explanation: