At a high concentration do you have more or less particles per unit volume

Answer:

Explanation:

Completely turn off equipment like televisions and stereos when you're not using them.

Choose energy-efficient appliances and light bulbs.

Save water.  

Lower your shades or close your curtains on hot days, to keep the house cool and reduce the use of electric fans or air-conditioning.

Let clothes dry naturally.

Keep lids on pans when cooking to conserve energy.

Use rechargeable batteries.

Don’t use “throw away” products like paper plates and napkins, or plastic knives, forks and cups.

Send electronic greetings over email, instead of paper cards.

Answer: Answer is in the Explanation.

Explanation: At noon the sun is directly above in the sky, the sun's rays are falling on the body making the shadow smaller. While in the evenings and mornings the sun is at a inclined position, so the sun's rays are falling at a inclined position making the body's shadow larger.  

I looked it up on the internet and reworded it as good as I could.

Answer:

here's the answer hope it helps

Answer:

The number of animals greatly exceeded the carrying capacity, destroying the food sources and causing the population to decline.  

ALSO

Overpopulation means that there are too many members in the population and that in the end, this will severely hurt their chances for survival.

Explanation:

The statement relates to overpopulation as overpopulation means that there are too many members in the population and that in the end, this will severely hurt their chances for survival.

Overpopulation means an increase in the number of a specific population in a specific place.

Overpopulated species harm other species. It competes for the food and place.

It also decreases the number of species that are its prey.

Thus, the correct option is B.

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Answer:

The three methods used to treat water are

Explanation:

These methods used include physical processes, biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination; and the use of electromagnetic radiation such as ultraviolet light.

Answer:

C. So electrons can flow from one electrode to another

Explanation:

An electrochemical cell is any cell in which electricity is produced by reason of a chemical change.

An electrochemical cell consists of two electrodes, these two electrodes are connected using a wire.

Usually, electrons flow from one electrode to another via this wire thereby enabling the electrochemical processes of oxidation and reduction in the cell to proceed effectively.

Answer:

.0016

Explanation:

For specific heat problems you use the formula :

Q = mcΔT

They've given you the m, c and delta T, so you can plug in those values. (for the temperature change subtract 10 from 40 to see that it grew 30 degrees)

You're looking for Q so leave that variable in the equation. Then solve.

.Q = (8.00)(.384)(30)

Q = 92.16

92.16 J energy will be absorbed by a copper sample.

Given:

Specific heat  capacity, C= 0.384 J/g °C

Temperature, T₁ = 10.0°C and T₂= 40.0°C

Mass, m=8.00 g

We know that,

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (g) of the material when its temperature increases or 1 °C, and its unit is J/g °C.

Heat energy in terms of specific heat energy can be calculated by using this formula:

Q= m. C. ΔT

∵ΔT= change in temperature,

ΔT=40.0-10.0°C=30°C

Now substituting the values in the above formula.

[tex]Q= 8.0*0.384*30=92.16J[/tex]

Hence, 92.16 J energy will be absorbed by a copper sample.

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Answer:

vocla cords

Explanation:

Answer: NaOH and Ca(OH)2 are bases. HCl and H2SO4 are acids

Explanation:

Answer:

(A) Heat energy

Explanation:

Temperature can be defined as a measure of the degree of coldness or hotness of a physical object. It is measured with a thermometer and its units are Celsius (°C), Kelvin (K) and Fahrenheit (°F).

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

Any material or object that allow the conduction (transfer) of electric charge or thermal energy is generally referred to as a conductor. Conductors include metal, steel, aluminum, copper, frying pan, pot, spoon etc.

In this scenario, Energy is added to cool water in a beaker. The energy causes the temperature of the temperature to rise. Thus, the term which best describes the energy is heat energy because the object becomes hotter due to an increase in temperature and heat applied.

Answer:

Surface currents in the ocean are driven by global wind systems that are fueled by energy from the sun. Patterns of surface currents are determined by wind direction, Coriolis forces from the Earth's rotation, and the position of landforms that interact with the currents

Answer:

0.5 M

Explanation:

Molarity = moles of solute / liters of solution

i dont know I hope someone knows soon take care

According to molar concentration, 100 ml of 10 M solution is needed to make 1 liter of a 1 M solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of two solutions, molar concentration is found out by, M₁V₁=M₂V₂.

On substitution in above formula, V₁=1×1/10=0.1 L=100 ml.

Thus, 100 ml  of a 10 M solution is needed to make 1 liter of a 1 M solution.

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Answer:

distance traveled divided by the time it traveled

Explanation

this is just an equation for how to find speed. you can also just use like a meterstick and a stopwatch

Answer:

For O: atomic number = 8 # neutrons = 8

For Al: atomic mass = 27, # electrons = 13

Answer: b

Explanation: alpha decay or particle consist of two protons and two neutrons hence it is a helium nucleus.

An alpha particle [tex]\binom {4} {2}[/tex]He is produced in alpha decay reactions, while the parent nucleus' atomic number and mass number drop by 2 and 4 correspondingly.

Therefore, the final answer is "Option B".

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Answer:

I believe its compaction

Explanation:

Compaction is how sedimentary rock is formedm

Answer:

243L of SO2

Explanation:

You'll want to use the Ideal Gas Law for this problem.

First, determine your formula. V=nRT/P

Next, determine your factors.

V = ?

n = 847g

R = 0.0821L.atm/mol.k

T = 313k (40+273)

P = 89.4kPa

Now just plug it in!

847g x 313k / 89.4kPa  x  0.0821L.atm / mol. K

243L of SO2. Hope this helps!

Answer:

Do you mean acids?

Due to chemical reaction

Explanation:

Acids are only stored in glass containers because glass containers rarely react with any substance.They dont react with acids and prevent chemical reaction so the acids can be kept. If acids were kept in metal containers it would react .

Answer:

D

Explanation:

Answer:

B

Explanation:

(Usually give an explanation, but doing an exam, so just trust)

i) KMnO4

lets calculate using x method

1+x+ 4(-2) = 0

1+x-8 =0

x= 7

ii)MnO4‐

x+4(-2) = -1

x-8 = -1

x = 7

Answer:

when you have a fever your body is trying to fight off a virus or some other kind of bad Bacteria  

Explanation:

I think this because everyone has at least had a fever when they were sick and when you are sick you are likely to have a fever because your body is fighting off a bad bacteria