The number of covalent bonds that an
In a covalent bond, two atoms are held together by the attraction between
atom can form depends on the number of
in the atom.
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Answer:

Heated water begins circulating in a fish tank.

Explanation:

Answer:

Heated water begins circulating in a fish tank.

Answer:

second law

Explanation:

Answer:

D, last one.

Explanation:

In order to use solar energy, we need solar panels.  Which we need sun for it to heat up, and once there is the sun.  The heat can hit the water, and cause the water to burn/boil

(NH₄)₂S

%N=  41.18%

%H =11.76%

%S=47.06%

Mg(NO₃)₂

%Mg=32.43%

%N=18.92%

%O=(64.86%

Given

(NH₄)₂S

Mg(NO₃)₂

Required

The percent composition

Solution

(NH₄)₂S MW=68 g/mol

%N=2. Ar N  / MW (NH₄)₂S x 100%

%N= (2.14/68) x 100% = 41.18%

%H =(8.1/68) x 100%=11.76%

%S=(32/68)x 100%=47.06%

Mg(NO₃)₂ MW=148 g/mol

%Mg=(2.24/148)x100%=32.43%

%N=(2.14/148)x100%=18.92%

%O=(6.16/148)x100%=64.86%

A scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.

Creativity is a mental cognitive ability that involves the creation and/or discovery of a hidden process.

In science, creativity refers to the application of mental skills to create new experimental designs and extrapolate findings.

In conclusion, a scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.

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Answer: Positive

Explanation: Just a guess

Answer:

Positive

Explanation:

Answer:

0.105 mol/dm³

Explanation:

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

Mass of MgCl₂ = 10 g

Volume of solution = 1 dm³

Concentration of MgCl₂ =?

Next, we shall determine the number of mole present in 10 g of MgCl₂. This can be obtained as follow:

Mass of MgCl₂ = 10 g

Molar mass of MgCl₂ = 24 + (2 ×35.5)

= 24 + 71

= 95 g/mol

Mole of MgCl₂ =?

Mole = mass /Molar mass

Mole of MgCl₂ = 10 / 95

Mole of MgCl₂ = 0.105 mole

Finally, we shall determine the concentration of MgCl₂. This can be obtained as follow:

Mole of MgCl₂ = 0.105 mole

Volume of solution = 1 dm³

Concentration of MgCl₂ =?

Concentration = mole / Volume

Concentration of MgCl₂ = 0.105 / 1

Concentration of MgCl₂ = 0.105 mol/dm³

Concentration is [tex]0.105\ mol/dm^{3}[/tex]

Given:-

Mass of MgCl₂ = 10 g

Volume of solution = [tex]1\ dm^{3}[/tex]

Concentration of MgCl₂ =?

[tex]Molar mass of MgCl_2 = 24 + (2\times35.5)\\= 24 + 71\\= 95 g/mol[/tex]

 Mole of MgCl₂ =?

The number of moles is calculated by the equation as follows:-

[tex]Mole = mass /Molar massMole of MgCl_2= 10 / 95Mole of MgCl_2 = 0.105 mole[/tex]  

Determine the concentration of [tex]MgCl_2[/tex] as follows:-

Mole of MgCl₂ = 0.105 mole

Volume of solution = 1 dm³

Concentration of MgCl₂ =?

[tex]Concentration = mole / Volume\\Concentration\ of\ MgCl_2 = 0.105 / 1\\Concentration \ of\ MgCl_2= 0.105 mol/dm^{3}[/tex]

Hence the concentration of 10g of magnesium chloride is [tex]0.105 mol/dm^{3}[/tex].

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Answer:

This strong current of warm water influences the climate of the east coast of Florida, keeping temperatures there warmer in the winter and cooler in the summer than the other southeastern states. Since the Gulf Stream also extends toward Europe, it warms western European countries as well.

Answer:

warm climates in northern Europe

Explanation:

I took the test in K12 and this was the answer :)

Answer:

I think A does because there are so many letters in their so a

x CO₂  = 0.236

x H₂  = 0.764

Given

P CO₂ = 217 mmHg

P H₂ = 703 mmHg

Required

The mole fraction

Solution

Dalton's law :

The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases  

Can be formulated:  

P tot = P1 + P2 + P3 ....  

P tot for the mixture :

= 217 mmHg + 703 mmHg

= 920 mmHg

Mole fraction of each gas :

x CO₂ = 217 mmHg/920 mmHg = 0.236

x H₂ = 703 mmHg/920 mmHg = 0.764

Answer:

June 20

Explanation:

Answer:Actinide Group

Explanation:Plutonium is a member of the actinide group in the periodic table. Plutonium atoms have 94 electrons and 94 protons with 2 valence electrons in the outer shell. There are 150 neutrons in the most abundant isotope.

Answer:

2.24dm³

Explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium  = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

   Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

   molar mass of He  = 4g/mol

  Number of moles  = [tex]\frac{4}{40}[/tex]   = 0.1mole

So;

                  1 mole of gas at rtp occupies a volume of 22.4dm³

                0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³

Answer:

when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)

Answer:

2KOH + 3co2 ------->2ксоз + 2Н20

Answer: Inorganic chemistry

Explanation:

Inorganic chemistry can be defined as the branch of chemistry which studies the behavior of the inorganic compounds. Inorganic compounds are those compounds which lack carbon hydrogen bonding. The carbon monoxide, carbon dioxide, sodium chloride and water are the examples of inorganic compounds. This branch also studies the effect of these chemical compounds on the living things. The water and salts are chemicals which regulate the chemical and physiological reactions in the body.

Answer:

communicable and non-communicable?

Answer:

The frequency of coral diseases has increased significantly over the last 10 years, causing widespread mortality among reef-building corals. Many scientists believe the increase is related to deteriorating water quality associated with human-made pollutants and increased sea surface temperatures.

Explanation:

Answer:

They are different because one is someone who studies volcanoes and the other is someone who studies weather

Explanation:

Answer:

When one object is rubbed against another, static electricity can be created. This is because the rubbing creates a negative charge that is carried by electrons. The electrons can build up to produce static electricity. For example, when you shuffle your feet across a carpet, you are creating many surface contacts between your feet and the carpet, allowing electrons to transfer to you, thereby building up a static charge on your skin. When you touch another person or an object, you can suddenly discharge the static as an electrical shock.

Similarly, when you rub a balloon on your head it causes opposite static charges to build up both on your hair and the balloon. Consequently, when you pull the balloon slowly away from your head, you can see these two opposite static charges attracting one another and making your hair stand up.

Materials

• Balloon

• An object made out of wool (such as a sweater, scarf, blanket or ball of yarn)

• Stopwatch

• A wall

• A partner (optional)

Preparation

• Blow up the balloon and tie off the end.

• Have your partner prepare to use the stopwatch.

Procedure

• Hold the balloon in a way that your hand covers as little of its surface area as possible, such as by using only your thumb and pointer finger or by gripping the balloon by its neck where it is tied off.

• Rub the balloon on the woolly object once, in one direction.

• Hold the balloon up on the wall with the side that was rubbed against the wool facing the wall, then release it. Does the balloon stay stuck on the wall? If the balloon stays stuck, have your partner immediately start the stopwatch to time how long the balloon remains bound to the wall. If the balloon does not stick, move to the next step.

• Touch the balloon to a metal object. Why do you think this is important to do?

• Repeat the above process but each time increase the number of times you rub the balloon on the woolly object. Rub the balloon in the same direction each time. (Do not rub the balloon back and forth.)

Observations and results

In general, did the balloon stick to the wall for a longer amount of time as you increased the number of times you rubbed the balloon on the woolly object?

Wool is a conductive material, which means it readily gives away its electrons. Consequently, when you rub a balloon on wool, this causes the electrons to move from the wool to the balloon's surface. The rubbed part of the balloon now has a negative charge. Objects made of rubber, such as the balloon, are electrical insulators, meaning that they resist electric charges flowing through them. This is why only part of the balloon may have a negative charge (where the wool rubbed it) and the rest may remain neutral.

When the balloon has been rubbed enough times to gain a sufficient negative charge, it will be attracted to the wall. Although the wall should normally have a neutral charge, the charges within it can rearrange so that a positively charged area attracts the negatively charged balloon. Because the wall is also an electrical insulator, the charge is not immediately discharged. However, because metal is an electrical conductor, when you rub the balloon against metal the extra electrons in the balloon quickly leave the balloon and move into the metal so the balloon is no longer attracted and does not adhere.

HOPE IT HELPS

PLEASE MARK ME BRAINLIEST

The test variables and the control variable and the outcome variables are Balloons, the electrical insulators, and resist electric charges flowing through them.

When we brush a balloon against our head, the hair and balloon both develop opposing static charges. We can see how these two opposing static charges attract one another and make our hair stand up as the balloon is gently dragged away from our head.

When a balloon is rubbed to the wall, it will be attracted to the wall. Because the wall is an electrical insulator, the charge is not quickly discharged.

The excess electrons in the balloon immediately leave the balloon and go into the metal when it is rubbed against metal. As a result, the balloon is no longer attracted to the metal and does not adhere.

Therefore, Balloons, which act as electrical insulators and prevent the flow of electric charges, serve as the test, control, and outcome variables.

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Answer:

 2Li   +   F₂    →    2LiF

Explanation:

The reaction expression is given as:

          Li   +   F₂    →     LiF

We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.

 Let use a mathematical approach to solve this problem;

  Assign variables a,b and c as the coefficients that will balance the expression:

             aLi   +  bF₂    →     cLiF

Conserving Li: a  = c

                   F:  2b  = c

          let a = 1, c  = 1 and b  = [tex]\frac{1}{2}[/tex]  

  Multiply through by 2;

        a  = 2, b = 1 and c  = 2

               2Li   +   F₂    →    2LiF

Solution :

Given :

length of silver cube = 2.28 cm

length of gold cube = 2.75 cm

Initial temperature = 82.8°C

Volume of silver cube is

Volume [tex]$=(\text{edge length})^3$[/tex]

               =    [tex]$(2.28)^3$[/tex]

                [tex]$= 11.8 \ cm^3$[/tex]

mass of silver cube

Mass, [tex]$m_s = \text{density} \times \text{volume} $[/tex]

                = 10.5 x 11.8

                = 123.9 g

Similarly, the volume of gold cube is

Volume [tex]$=(\text{edge length})^3$[/tex]

               =    [tex]$(2.75)^3$[/tex]

                [tex]$= 20.79 \ cm^3$[/tex]

mass of gold cube

Mass, [tex]$m_g = \text{density} \times \text{volume}$[/tex]

                = 19.3 x 20.79

                = 401.247 g

Now

heat lost by silver and gold cube = heat gained by water

∴[tex]$m_g .c_g \Delta T + m_s .c_s \Delta T = m_w.c_w \Delta T$[/tex]

[tex]$m_g .c_g (82.8- T) + m_s .c_s (82.8- T) = m_w.c_w (T - 20.2)$[/tex]

[tex]$401.247 \times 0.1264 (82.8- T) + 123.9 \times 0.2386 (82.8- T) = 111.5 \times 4.184 (T - 20.2)$[/tex]

Now solving the equation

[tex]$50.71 (82.8- T) + 29.56 (82.8- T) = 466.51 (T - 20.2)$[/tex]

Final temperature, T = 31.27°C

Answer:

Answer choice c  = 174

Explanation:

If you divide 30% into 580 you get 174. You can also check your work by doing 580 divided by 70%

30% divided by 580 = 174

they are found on the crust

Answer:

crust

Explanation:

Answer:

D.the metal atom use their positive charges to gain additional electrons until every atom has eight valence electrons.

The statement which best describes the metallic bonding is (B). The valence electrons between the metals become decoalized and can move freely between the metallic cations.Hence the correct option is (B).

Chemical bonds known as metallic bonds are produced by the electrostatic attraction of positively charged metal ions and conduction electrons.

A structure of positively charged ions may be thought of as sharing free electrons.

Atoms in a metallic substance are held together by a force called the metallic bond. Atoms in such a solid are packed closely together. Each metal atom's outermost electron shell typically overlaps with a significant number of its nearby neighbors.

Therefore, The statement which best describes the metallic bonding is (B). The valence electrons between the metals become decoalized and can move freely between the metallic cations.Hence the correct option is (B).

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1.63 M

Math

Pre-Algebra

Order of Operations: BPEMDAS

Equality Properties

Chemistry

Unit 0

Aqueous Solutions

Step 1: Define

1.43 mol NaCl (sodium chloride)

0.875 L solution

Step 2: Find M

Step 3: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.63429 M ≈ 1.63 M

Answer:When acids react with carbonates,---CO2--------gas is liberated.

Explanation:

Acids liberate Carbon IV oxide when they react with  Carbonates  bicarbonate

For examples

Acid +carbonate  ⟶ Salt + Water + Carbon dioxide

Calcium carbonate + Hydrochloric acid  will give Calcium chloride with the liberation of CO2 gas and water

CaCO3 + 2HCl →CaCl2 + CO2 + H2O

To Test for the presence of the CO2 Liberated, we pass the gas through lime water, if the lime water turns milky, then C02 gas is confirmed.