Battery
Lightbulb
Metal
paper
clips
Wood
Motal noodle
Wire
Why does the bulb light when the needle touches a paper clip?
point
1. convection cells are produced
2. vibrations set up wavelike disturbances
ОООО
3. a circuit is completed
4. a phase change occurs

Answer:

yes eating the food involves both physical and chemical changes. The chewing of food is a physical change, while the mixing of saliva with food triggers chemical reactions

Explanation:

Once the food mixes with the saliva in our mouth, chemical reactions start taking place in the food, leading to its breakdown and changes in its chemical composition. An evidence of the chemical changes is the taste that we feel when we eat something sweet or sour etc.

Answer:

a chechimal

Explanation:

Answer:

a\c enables the protons so therefore we duplicate the neutrons making for the first one 80 squared then subtracted by 201 and then do that for all

Answer:

a

Explanation:

relative formula mass of Ca(C2H3O2)2=158

% for Ca=25.3

% for C=30.4

% for H=3.8

% for O=40.5

Answer:

Choice a. The compound [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] contains approximately [tex]25.3\%\; \rm Ca[/tex], by mass, approximately [tex]30.4\%\; \rm C[/tex] by mass, approximately [tex]3.8\%\; \rm H[/tex] by mass, and approximately [tex]40.5\%\; \rm O[/tex] by mass.

Explanation:

Look up the relative atomic mass of these elements on a modern periodic table:

The relative atomic mass of an element gives the numerical value of the mass (in grams) of one mole of the atoms of this element. For example, the relative atomic mass of hydrogen is [tex]1.008[/tex]. Therefore, the mass of one mole of hydrogen atoms would be (approximately) [tex]1.008\; \rm g[/tex].

One mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units include:

Inside each mole of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions, there are:

Therefore, that [tex]2\; \rm mol[/tex] of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions in one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units would include:

In summary, each mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units would contain:

Calculate the mass of these atoms using their relative atomic mass data.

For example, the mass of one mole of [tex]\rm H[/tex] atoms is (approximately) [tex]1.008\; \rm g[/tex] because the relative atomic mass of hydrogen is [tex]1.008[/tex]. Therefore, the mass of that [tex]6\; \rm mol[/tex] of hydrogen atoms would be approximately:

[tex]6\; \rm mol \times 1.008\; \rm g \cdot mol^{-1} = 6.048\; \rm g[/tex].

Similarly, calculate the mass of the other three elements in one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units:

The sum of these masses is [tex]158.166\; \rm g[/tex].

In other words, the mass of one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units is (approximately) [tex]158.166\; \rm g[/tex]. Approximately [tex]40.078\; \rm g[/tex] of that is [tex]\rm Ca[/tex]. Therefore, the percentage of [tex]\rm Ca\![/tex] by mass in [tex]\rm Ca(C_2 H_3 O_2)_2\![/tex] would be approximately:

[tex]\begin{aligned}&100\%\times \frac{40.078\; \rm g}{158.166\; \rm g} \quad \genfrac{}{}{0pt}{}{\leftarrow\text{mass of $\mathrm{Ca}$ in $\mathrm{Ca(C_2 H_3 O_2)_2}$}}{\leftarrow\text{mass of $\mathrm{Ca(C_2 H_3 O_2)_2}$}}\\ & \approx 25.3\% \end{aligned}[/tex].

In other words, [tex]\rm Ca[/tex] accounts for approximately [tex]25.3\%[/tex] of the mass of [tex]\rm Ca(C_2 H_3 O_2)_2\![/tex].

In a similar way, calculate the percentage of the other three elements by mass.

Answer:

the nominal density of a golf ball is to be approximately 0.65 ounces per cubic inch.

Explanation:

Answer:

Akash

Explanation:

it could be a magnet with the same poles facing eachoher

Answer:

The peripheral nervous system can be further divided into the autonomic system, which regulates involuntary actions, and the somatic system, which controls voluntary actions.

Explanation:

mark as brainly plz and thanks

Answer: voluntary actions.

Explanation:The peripheral nervous system can be further divided into the autonomic system, which regulates involuntary actions, and the somatic system, which controls voluntary actions.

Answer:

219 mmHg

Explanation:

The partial pressure of a gas refers to the pressure exerted by one of the gases in a mixture of gases.

The total pressure of a gas is the sum of all the partial pressures of all the gases in the mixture.

Since the total pressure = 745 mmHg

The partial pressure of helium is;

745 - (125 + 214 + 187)

Partial Pressure of helium gas= 219 mmHg

Answer:

When you lower the temperature, the molecules are slower and collide less. That temperature drop lowers the rate of the reaction. When you increase the pressure, the molecules have less space in which they can move. That greater density of molecules increases the number of collisions.

Explanation:

would u like to do a zoom?

If u can...

im just bored and my friend fell asleep on me :/

Temperature measures the average kinetic energy of particles of the substances. Therefore,  reducing the temperature of chemical reaction reduces  rate of reaction.

Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.

Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source.

When the temperature is reduced, the molecules move more slowly and collide less. The reaction's pace is slowed as the temperature drops. When the pressure is increased, the molecules have much less area to travel in. The number of collisions rises as the density of molecules increases.

Therefore,  reducing the temperature of chemical reaction reduces  rate of reaction.

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Answer: 1400 mL

Explanation:

The change in volume with change in pressure and change in temperature can be calculated using combination of gas laws. Here, the change in volume is 5600 ml.

Boyle's law, Charles's law and Gay- Lussacs law all relating the temperature, pressure and volume of an ideal gas. The relation between these three parameters from the combination of these laws at conditions is written as:

P1 V1/T1 = P2 V2/ T2.

From this, the change in volume V2 can be calculated.

Given , P1 = 760 mmHg

T1 = 20 k and V1 = 1400 mL.

T2 = 40 k and P2 = 380 mmHg.

The new volume V2 = P1 V1 T2 / T1 P2.

                                  = (760 mmHg × 1400 ml × 40K) / (20 K × 380 mmHg)

                                  = 5600 mL.

Therefore, the change in volume of the gas is 5600 ml.

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Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]a = \frac{f}{m} \\ [/tex]

f is the force

m is the mass

From the question we have

[tex]a = \frac{5}{0.25} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Yep i think so.

Explanation:

Pretty sure molecules examples of things in matter...you might wanna double check tho

For condensation to take place there should be noticeable difference between the temperature of the system and the atmosphere. Thus condensation is the reason for clinging of water particles to the side of the glass.

Condensation is a process in which the vapor state converts to liquid state. Condensation is the reverse process of evaporation. Condensation occur at dew point. Dew point is the temperature at which condensation starts.

When the hot air particles collides with the surface of the glass having ice water, then the hot particles that had so much energy or kinetic energy suddenly reduces its energy and converts to water due to the change in temperature and pressure .

Thus condensation is the reason for clinging of water particles to the side of the glass having ice water.

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Answer:

Stress

Explanation:

Stress increases along faults and leads to rock breaking. Therefore option D is correct.

Along faults, stress builds up in the rocks due to the movement and interaction of tectonic plates. Stress is the force applied to the rocks, and it can occur in various forms, such as compression, tension, or shear. As the stress increases, the rocks become more strained and are pushed to their breaking point.

When the stress exceeds the strength of the rocks, they can no longer withstand the applied forces and break, resulting in an earthquake. The release of accumulated stress along the fault causes the rocks to rupture and generate seismic waves, leading to ground shaking and the propagation of energy throughout the Earth's crust.

Therefore, stress is the primary factor that increases along faults and ultimately leads to rock breaking and the occurrence of earthquakes.

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Explanation:

use the term electron sheilding, the more electrons between the valence el3ctron and nucleus the easier to lose the valence electron (more sheilding = easier to lose)

Answer:

A Punnet Square...the second I am not sure.

Explanation:

Unfortunately the second could be many things. You'd have to have more background information.

Answer:

PUNNETT....,MAKE SURE U HAVE 2 T,s

Explanation:

punnett and cross

Answer:

metal and non metal-electrovalent

500 mL of He at 98 kPa expands to 750 mL. Find P2.

P₂ = 65.3 kPa

Given

V₁=500 ml

P₁=98 kPa

V₂=750 ml

Required

P₂

Solution

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

Input the value :

[tex]\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_1=\dfrac{98.500}{750}\\\\P_2=65.3~kPa[/tex]

Answer:

✔ semiarid

✔ desert

✔ semiarid

✔ steppes

.

Explanation:

The deserts and steppes comprise the regions that are characterized by dry climates. The dry climates are characterized by very little rainfall, hot summers, and mild winters. The correct option is B.

The areas which are very dry and where the water escapes and leaves the area drier than other places is known as the dry climate. Most dry climates have summers very hot, winters cool and warm and the air is very dry.

The main characteristic feature of the dry climate is the low and infrequent rainfall. Arid and semi desert areas have only about 35 cm rainfall per year.

Thus the correct option is B.

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Answer:

0.001 mole of NaF.

Explanation:

From the question given above, the following data were obtained:

Volume of solution = 100 mL

Molarity = 0.01 M

Mole of NaF =?

Next, we shall convert 100 mL to litre (L). This can be obtained as follow:

1000 mL = 1 L

Therefore,

100 mL = 100 mL × 1 L / 1000 ml

100 mL = 0.1 L

Thus, 100 mL is equivalent to 0.1 L.

Finally, we shall determine the number of mole of NaF present in the solution. This can be obtained as follow:

Volume of solution = 0.1 L

Molarity = 0.01 M

Mole of NaF =?

Molarity =mole /Volume

0.01 = mole of NaF / 0.1

Cross multiply

Mole of NaF = 0.01 × 0.1

Mole of NaF = 0.001 mole.

Thus, 0.001 mole of NaF is present in 100 mL of the solution.

Mass of water vapor = 193 g

Given

435 kJ of heat are released

Required

mass of water vapor

Solution

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lv for water = 2256 kJ/kg or 2256 J/g or 40.7 kJ/mol

So the mass of water vapor :

[tex]\tt m=\dfrac{Q}{Lv}\\\\m=\dfrac{435000~J}{2256~J/g}\\\\m=192.8\approx 193~g[/tex]

Answer:

The answer will be A

Explanation:

A scientific law is based on repeated experiments or observations, that describe or predict a range of natural phenomena. A scientific law is something that is unexpected

Answer:

B

Explanation:

It just is.......

Answer:

B

Explanation:

Answer:

b

Explanation:

Answer:

c or d it measures smallest to biggest and biggest to smallest

Answer:

your answer is a

Explanation:

Answer:

D-  Y -Z -X -W

:)

The solution with lowest pH are more acidic and those with higher pH values are basic. The given solutions can be ranked from the strongest to weakest acid as Y Z X W.

pH of a solution is the measure of its H+ ion concentration. Mathematically it is the negative logarithm of H+ ion concentration of the solution. The acidic solutions contains more H+ ions.

A pH value of 7 represents a neutral solution. The pH above 7 is basic solution and a solution with pH below 7 is acidic in nature. A pH scale can be used to measure the range.

The pH of 1  and 3 indicates strong acidic solutions and 5 and 6 are weakly acidic . The lowest value of pH indicates highest acidity. Therefore, the correct order is Y Z X W.

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B, C

verified just did it

B. State

C. Melting Point

Thus, options B and C are correct.

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Answer:

A

Explanation:

27 us the number of protons when we subtract 27 from 59 it will be 32 because a mass number is the sum of proton and neutron but tell u more on the comment

Answer: A - An atom of cobalt contains more neutrons than protons.

Explanation: The atomic number is the number of protons in an atom. The atomic mass is the sum of protons & neutrons in an atom. So, with simple math we can figure out the number of neutrons. Total 59 - 27 protons = 32 neutrons. Which means that A is the only right answer in this case.

Little Extra: A & B would both be correct if Cobalt was a negatively charged ion. An atom is an ion if it is charged, and an ion is either negatively charged or positively charged. For example, if Cobalt had 27 protons & 26 electrons it's overall charge would be positive since it has more protons than electrons. And it would be negatively charged if Cobalt had 27 protons & 28 electrons. No charge if there are 27 protons & 27 electrons because proton +1 and electron -1. Imagine 27-27=0 no charge, 27-26= +1 charge, 27-28= -1 charge

I hope this made you smarter.

Answer:

238g

Explanation:

Molar Mass (1 mol) of H2O2 = 34.0147 g/mol

7.00 mol = 35.0147*7

= 238.1029g

= 238g (rounded to 3 sig figs because 3 sig figs in 7,00)

Answer:

answer in picture

Explanation:

Answer:

Iron wood is very dense and will sink in water. B

Explanation:

Hope this helps!!

Answer:

B

Explanation: