someone help asap its due in 10 mins

Answer: C

Explanation:

Answer:

D. The discovery of new evidence.

D is correct because it's the only one that would give proof and science relies on proof.

Answer:

what?

Explanation:

what the hell?

Answer:

Separation by density

Hope this helps

Answer:

Magnetic separation

Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.

Explanation:

Separation techniques makes use of the differences in the properties of components of mixtures to separate theses components, one from another.

In a moxturemof iron shavings and sawdust, a suitable separation technique would be the use of magnetic separation.

The use of this separation technique is abasednonnthe principle that when a magnetnis brought near to a mixture containing magnetic and non-magnetic materials, the magnetic materials will be separated from the non-magnetic materials due to their attraction to the magnet. Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.

Answer:

there r 118 elements in periodic table..

hope it helps.

Explanation:

there are 118 elements.

yeah same I'm bóred too -,-

Answer:

sure hi ...............................

Answer:

To find molarity we must convert grams KCl to moles KCl and mL solution to L: ... EXAMPLE: What mass of potassium chloride would be needed to prepare 250.0 mL of a 0.500 ... EXAMPLE: Silver nitrate solution is added to 25.00 mL of a 0.500 M potassium chloride ... g) 0.655 g of sodium carbonate in 100.0 mL of solution.

Explanation:

Answer: Force disadvantage and distance advantage

Explanation: When mechanical advantage is less than one the force of the strength decreases because input force is greater than output force.

The distance increases ie the object is moving over a long distance.

Example when fishing with a long fishing rod the force applied to move the fish from the water is greater than the weight of the fish itself. The advantage of using the long fishing pole is that the distance over which the fish travels is greatly increased.

Hope this helps. It took me about half an hour before I could get this answer from my various searches. The idea might not be clear but this was what I was able to understand.

Answer:

0.693 (you can round it up if you want to)

Explanation:

Density= mass ÷ volume

54.2 ÷ 78.1 = 0.693

I hope this helped☺

Answer:   Y  21.38 % , Al  32.44 % and O 46.16 %

Explanation: Molar mass of YAl5O12 is 88.91 + 5·26.98+12·16

= 415.81 g/mol

  m-% ( Y) = 88.91 / 415.81 = 21.38 % ,     m-% (Al) = 5·26.98 / 415.81 =

  32.44 %  , rest is Oxygen

Answer:

[NaCl] = 1.72 M

Explanation:

First of all, we balance the equation:

BaCl₂ + Na₂SO₄ →  2NaCl + BaSO₄

We convert mass of barium chloride to moles

45 g . 1mol / 208.23g = 0.216 moles

Ratio is 1:2. This means, that our moles of reactant may produce the double of moles, of product.

0.216 . 2 = 0.432 moles of NaCl are been produced.

Molarity is mol/L. We convert volume of water from mL to L

250 mL . 1L /1000 mL = 0.250 L

[NaCl] = 0.432 mol/0.250L = 1.72 M

Answer:

Esto se debe a que la heladera tiene mucha menor temperatura que la temperatura ambiente.

Esta menor temperatura ayuda a luchar contra los microorganismos que están en los alimentos (bacterias, hongos, etc) pues detiene en gran medida su repreduccion, la cual se ve maximizada en los rangos entre 5°C y 60°C, tal que la temperatura ambiente suele estar en el rango donde los microorganismos prosperan y se reproducen, es por ello que los alimentos se conservan mucho mejor en ambientes fríos (como la nevera) que en temperatura ambiente.

Answer:

The next step is prototype testing

Explanation:

The stages of the design process are;

1) Situation analysis

Paper based research is conducted on the situation to obtain the situation parameters

2) Brief writing

With the situation analysis developed above, the brief of the current situation is put down on paper

3) Problem research

The problem is researched and experimented on with the development of a paper based proof of the possible concept

4) Specification writing

The specifications of the problem are outlined

5) List the possible solutions

The possible solutions are brainstormed and listed

6) Preferred solution selection

The preferred solution is selected based on the constraints in the situation

7) Create working drawing/plan

The working design drawing of the selected solution or concept is completed and evaluated for applicability

8) Building of a prototype

The design is converted into a prototype which is a model of the actual solution

9) Testing of the prototype

The prototype is tested for functionality, for ability to work in the intended situation and/or in the intended system

10) Report writing

A report is made on the outcome of the tests for review before production

Therefore, after the prototype is created, stage 8, the next step is the testing of the prototype stage 9.

Answer:

The molarity of the solution is 0.29 [tex]\frac{moles}{liter}[/tex]

Explanation:

Molarity, or molar concentration, is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species. It is defined as the number of moles of solute that are dissolved in a given volume.

Molarity is calculated as the quotient between the number of moles of solutes and the volume of the solution:

[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case:

Replacing:

[tex]Molarity=\frac{2.1 moles}{7.3 liters}[/tex]

Molarity= 0.29 [tex]\frac{moles}{liter}[/tex]

The molarity of the solution is 0.29 [tex]\frac{moles}{liter}[/tex]

Answer:

M = 0.29 M

Explanation:

We are given;

Number of moles of NaCl; n = 2.1 moles

Total volume of solution; V = 7.3 L

Formula for molarity is;

M = n/L

Thus;

M = 2.1/7.3

M = 0.2878 M

Approximating to 2 decimal places gives;

M = 0.29 M

Answer:

They are similar, because one can be obtained by dilating the other about the origin with a scale factor of 1/2.

Explanation:

The image is dilated by 1/2.

Take a look.

The coordinate labels of the preimage include: A, B, C, and D.

The coordinate labels of the image include: A', B', C', and D'.

Coordinates of point A: (2, 8)

Coordinates of point A': (1, 4)

**The preimage's x and y-coordinates multiplied by 1/2 will give you the x and y-coordinates of the image.**

Answer:

0.184 mol

Explanation:

Look up molar masses for the elements that comprise H₃PO₄:

H = 1.008 g/mol

P = 30.97 g/mol

O = 15.99 g/mol

The molar mass of H₃PO₄ is a weighted sum of these (3 hydrogen + 1 phosphorus + 4 oxygen) that comes out to about 97.99 g/mol.

Then

(18 g H₃PO₄) × (1/97.99 mol/g) ≈ 0.1837 mol

Answer:

the higher the kinetic energy

Explanation:

because their will be easy movement of particles.

Answer:

i think her journey was 680 km/h long

Answer:

6.67 hours

Explanation:

(800 km) / (120 km/hr) = 6.67 hours

Answer:

3.97e24

Explanation:

For every mol of any substance there are 6.02x10^23 molecules

so

6.6(6.02x10^23)= 3.97x10^24 Molecules of ZnO

Answer:

P = 400 Lb/in²

Explanation:

We are given;

Weight of woman; W = 100 lb

Area beneath heel of shoe; 0.25 in²

Now, we want to find pressure.

Formula is;

P = F/A

Where;

F is force exerted by the object which is equal to weight of the object

A is area covered by object

Thus;

P = 100/0.25

P = 400 Lb/in²

Answer:

answer is option 2 hope it helps

The step that must be occurred in the calculation of the enthalpy of the given reaction is option B, reverse the second equation, and change the sign of the enthalpy, then add.

The enthalpy of a reaction is the heat energy absorbed or released by the reaction system. For a reaction, the reaction enthalpy can be calculated using the enthalpies of the component reactions.

Here the overall reaction is the formation of CO and H₂ from C and water. The first step is to reverse the second equation and change sign of enthalpy and double the first equation. Then add them, so that the CO₂ get eliminated.

Then, the resultant equation is halved again. Then divide the third equation by two and its enthalpy value also divided by 2. Then add it to the previous one and we get the net equation and corresponding reaction enthalpy.

Therefore, the step that must occur here is option B.

Find more on reaction enthalpy:

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Explanation:

mass number = sum of protons and neutrons

= 87 + 136

= 223

chemical symbol = Fr

ion charge = +1 (because it has one more proton than electron)

atomic mass number = sum of protons and neutrons

= 87 + 136

= 223

chemical symbol = Fr, ion charge = +1 (because it has one more proton than electron)

Atoms are the basic and smaller units of elements which cannot be broken down further chemically, atoms and elements are organized and represented onto a display called the periodic table.

Atoms are composed of protons, neutrons, and electrons, where protons and neutrons present at the nucleus center of the atom where as electron surrounds the nucleus.

The center of the atom makes up most of the mass of the atom as this is made up of protons and neutrons. Protons are positively charged particle  and neutrons  have neutral charge, respectively, and each are have a mass of 1 atomic mass unit (amu).

Electrons are negatively charged particle and Amu's are units of measurement for atomic mass, proton and neutron are both equal to 1 amu.

Atomic mass units are based on the masses of protons and neutrons band one carbon atom has only six protons and usually six neutrons in the nucleus.

For more details regarding atomic mass, visit

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Answer:

=2h20−2kmno4+2mno2+2ckl+cl2+4hko+o2

Explanation:

step-by-step.

2mno2+4koh+o2+cl2−2kmno4+2kcl+2h20

=2mno2+4hko+o2+cl2+−2kmno4+2ckl+2h20

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Oxide, or 159.6882 grams.

Answer:

I believe the answer is "increasing"

Answer:

the shielding of electrons.

Explanation: