is evaporation of water a physical change or a chemical change ?​

Answer:

Endothermic reaction

Explanation:

Endothermic reactions take in energy from the surroundings.

Energy is a reactant in endothermic reactions, and the temperature of the surroundings will decrease because it took in energy.

Answer:

Explanation: The main difference between Genetic and Hereditary Diseases is that genetic disease is a condition which occurs due to an abnormality in the individual’s genome while a hereditary disease is a condition caused by a mutation of a gene which can be characteristically transmitted from one generation to another, also The main difference between these two terms lies in the fact that hereditary diseases have the potential of being carried from one generation to another whereas a genetic disease can either be hereditary or not, but there will always be a mutational change in the genome.

Answer:

2KClO3 -------> 2KCl + 3O2

Explanation:

First, in balancing a chemical reaction such as the one given in the question, you should understand that for an equation to be balanced, the number of atoms and ions on both sides of the equation that is the right and left side must be equal. This follows the law of conservation of mass which tells us that matter can neither be created nor destroyed but can be changed into another form.

Next is to begin balancing the equation by identifying and writing down the substances given:

KCl03 ---------> KCl + O2

Next is to count he number of the individual atoms on each side and find out if they are the same on both sides and if not you must follow the next step.

Add a corresponding number and use it to multiply the atoms involved

KClO3 ---------> KCl + O2

Oxygen is 3 on the left side and two on the other side, so we multiply the left hand side by 2 and the right hand side by 3

2KClO3 -----> KCl + 3O2

The potassium and Chlorine are no longer balanced, so you multiply the right had=nd side of KCl by 2.

2KClO3 -----> 2KCl + 3O2

The reactionis herefore balanced as both sides have equal number of atoms and ions.

Dimensional analysis is the unitary method that is used to determine the values by multiplication. The cost of the ice cream sandwiches for the barbecue is 367.5 $.

Dimensional analysis has been defined in maths, physics, and chemistry to solve the problem by multiplying the given numbers to determine the values of the other data. It uses the base quantities to estimate the derived values.

Given,

Number of people at barbecue = 175

Cost of ice cream sandwiches = $1.68 per dozen

The average number of sandwiches per person = 1.25

The cost to buy ice cream sandwiches for the barbecue is estimated by the dimensional analysis as:

12 ice cream sandwiches = $1.68

1.25 ice cream sandwiches = $2.1

If it costs $2.1 for each person then 175 people costs:

$2.1 × 175 = $367.5

Therefore, it will cost 367.5 $ for the barbecue.

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Answer:smashing an object into many pieces is a physical change

Explanation:

becauseee i’m not sure i’m getting points

Answer:

smashing an object into many pieces is a physical change

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

Density = 3.20 g/mL

volume = 15.0 mL

Substitute the values into the above formula and solve for the mass

That's

mass = 3.20 × 15

We have the final answer as

Hope this helps you

Answer:

The acid will be neutralized overtime

Explanation:

The presence of the pyrites leads to the leaching of large amounts of sulphuric acid, however the basic carbonates neutralizes the acid according to the reaction equation;

CaCO3 + H2SO4 ---> CaSO4 + CO2 + H2O.

This will prevent all the deleterious consequences associated with the leaching of the acid in the abandoned coal mine.

Answer:

0.085 kg

Explanation:

1 g=0.001 kg  OR 1 kg=1000 g

 so [tex]\frac{85}{1000}[/tex]=0.085 kg

Answer:

I'm not sure but I think the answer is Cathodic protection.

Answer:

B.  Na

Explanation:

To identify an atom, you simply need to look at the number of protons.  This atom has 11 protons.  On the periodic table, you can see that the element with 11 protons is sodium (Na).

Answer:

Explanation:

[tex]\frac{mass}{volume} =density\\mass=volume \times density=25.3 \times 0.75=18.975 ~gm[/tex]

Answer:

distance is 16m

displacement 4m east

Answer:

Explanation:

6CO₂ + 6 H₂O ⇄ C₆H₁₂0₆ + 6O₂

This is the chemical equation given .

1. The equation shows a __Chemical equation_______the breaking and forming of chemical bonds that leads to a change in the composition of matter.

2. In the equation, CO₂ is a___reactant_____.

3. In the equation, C₆H₁₂0₆ is a ___product________.

4. In O₂, the type of bond that holds the two oxygen atoms together is a_nonpolar_covalent bond_________.

5. In H₂O, the type of bond that holds one of the hydrogen atoms to the oxygen atom is a__polar_hydrogen bond____.

6. The number of oxygen atoms on the left side of the equation is__equal to_________ the number of oxygen atoms on the right side.

Answer:

proton

Explanation:

if it was not an isotope..

Answer:  You didn't give anything to select, however, the emission spectrum of a chemical element is frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

Probably because they think it is more accurate.

Hope it helps.

Answer: (10,-14) I think

Explanation:

Answer:

The dependent variable is the variable being tested and measured in an experiment, and is 'dependent' on the independent variable.

Answer:

variable   whose value depends on that of another Explanation:

Answer:

Hope it helps.

Explanation:

The lanthanide (/ˈlænθənaɪd/) or lanthanoid (/ˈlænθənɔɪd/) series of chemical elements[1] comprises the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium.[2][3][4] These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.

The informal chemical symbol Ln is used in general discussions of lanthanide chemistry to refer to any lanthanide. All but one of the lanthanides are f-block elements, corresponding to the filling of the 4f electron shell; depending on the source, either lanthanum or lutetium is considered a d-block element, but is included due to its chemical similarities with the other 14.[5] All lanthanide elements form trivalent cations, Ln3+, whose chemistry is largely determined by the ionic radius, which decreases steadily from lanthanum to lutetium.

They are called lanthanides because the elements in the series are chemically similar to lanthanum. Both lanthanum and lutetium have been labeled as group 3 elements, because they have a single valence electron in the 5d shell. However, both elements are often included in discussions of the chemistry of lanthanide elements. Lanthanum is the more often omitted of the two, because its placement as a group 3 element is somewhat more common in texts and for semantic reasons: since "lanthanide" means "like lanthanum", it has been argued that lanthanum cannot logically be a lanthanide, but IUPAC acknowledges its inclusion based on common usage.[6]

In presentations of the periodic table, the lanthanides and the actinides are customarily shown as two additional rows below the main body of the table,[2] with placeholders or else a selected single element of each series (either lanthanum and actinium, or lutetium and lawrencium) shown in a single cell of the main table, between barium and hafnium, and radium and rutherfordium, respectively. This convention is entirely a matter of aesthetics and formatting practicality; a rarely used wide-formatted periodic table inserts the lanthanide and actinide series in their proper places, as parts of the table's sixth and seventh rows (periods).

The 1985 International Union of Pure and Applied Chemistry “Red Book” (p. 45) recommends that "lanthanoid" is used rather than "lanthanide". The ending “-ide” normally indicates a negative ion. However, owing to wide current use, “lanthanide” is still allowed.

Answer:

D. Europium

Explanation:

I got this as a correct answer on apex

Answer:

there primary food source will still be the same

Explanation:

they will still ear mice but coyotesmay eat Humans if they are close because once they see humans they think they will be killed its there protectiong

Answer:

D. It will increase because coyotes are the competition.

Explanation:

Because Competition is When 2 organisms fight for the same thing, and sense rattlesnakes are the other competition they will increase because coyotes are being killed.

Answer:

C. The potential energy change for a chemical reaction.

Explanation:

The reaction coordinate q illustrates, graphically, the energy changes during exothermic and endothermic reactions. This graphical representation of the energy changes in the course of a chemical reaction is known as reaction coordinates. A reaction coordinate is a graphical sequence of steps by which the reaction progresses from reactants through activated complexes to products. Reaction coordinates explain how far a reaction has proceeded towards the products or from the reactants.

From the images attached below, we can see the reaction coordinates in the reaction profiles.

Answer:

1.Observation

2. Inference

3. Observation

4. Inference

5. Observation

6. Observation

7. Inference.

Answer:

Answer would be that boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid. Boiling and melting are phase changes that can happen to a substance however they differ in the process that happens.

Explanation:

Two physical properties of matter can be best compared as boiling points and melting points are similar because both involve the change in a state of matter. But they are different because melting point involves a change from a solid to a liquid and boiling point involves a change from a liquid to a gas.

A boiling point of a liquid can be described as the temperature at which the vapour pressure is equal to the atmospheric pressure of the liquid. The liquid is changed into a vapour at this temperature.

With the addition of heat, the liquid will change into vapour without any increase in temperature. The vapour pressure of the gas increases until it is equal to the pressure of the gas surrounding it. Bubbles are formed within the liquid and rise to the surface.

The melting point of a substance can be described as the temperature at which it transforms the state from solid to liquid. At the melting point, the solid phases and liquid phases exist in equilibrium. The melting point depends on pressure and is generally specified at a standard pressure such as 1 atmosphere.

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Your question is incomplete, but most probably complete question was,

Which statement best compares and contrasts two physical properties of matter?

A) Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material. Density and solubility are similar because they both involve a material’s mass and volume, but they are different because density involves floating materials and solubility involves sinking materials.

B) Boiling points and melting points are similar because they both involve changing the heat of a material, but they are different because boiling point involves adding heat to a material and melting point involves removing heat from a material. Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.

Answer:A physical property is one that can be changed without altering the identity of a substance. These set of properties is not concentration dependent. They are used to describe matter. Examples are density, solubility, melting point, color and odor. For this case, the second option seems to fit the description. It can be reshaped by a force.

Explanation:

Answer:b

Explanation:

The option that correctly shows the electron configuration for the atom with one more electron than the one shown above would be the second diagram.

According to Hund's rule, electrons are distributed into empty orbitals singly before pairing can start.

Following the rule:

The only diagram that follows Hund's rule is diagram 2.

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Answer:

3.4x10 to the power of 5

Explanation:

Answer:

My answer to the question is 3.4×10^-5.

Answer: the plasma membrane, the cytoplasm, ribosomes, and genetic material.

hope this helped

Answer:

(simple differences)Biodegradable substances are those that degrades or break down naturally...

Non-biodegradable substances are those that do not degrades easily...

Answer:

Biodegradable substances are those that degrades or break down naturally

Non-biodegradable substances are those that do not degrades easily