Water molecules are __________.
a. composed of atoms joined by stable polar covalent bonds
b. attracted to each other because of their polar nature
c. capable of interacting with ions and polar molecules because of water being a polar molecule
d. all of the above are true

Answers

Answer 1
D the reason is that they are all true

Related Questions

How many moles of magnesium chloride are formed when 55 ml of 0.70 m hcl is added to 42 ml of 1.204 g mg(oh)2?

Answers

I'm not sure, you might have to double check, but 0.019 mol
Final answer:

To find the moles of magnesium chloride formed, first calculate the moles of HCl and Mg(OH)2. Then, use the stoichiometry of the balanced chemical equation to determine the moles of MgCl2. The moles of MgCl2 formed will be half of the moles of HCl.

Explanation:

To calculate the moles of magnesium chloride formed when 55 mL of 0.70 M HCl is added to 42 mL of 1.204 g Mg(OH)2, we need to determine the limiting reactant and use stoichiometry. First, let's calculate the moles of HCl:

Moles of HCl = concentration (M) x volume (L) = 0.70 M x 0.055 L = 0.0385 moles HCl

Next, let's calculate the moles of Mg(OH)2:

Moles of Mg(OH)2 = mass / molar mass = 1.204 g / (24.31 g/mol + 2(16.00 g/mol) + 2(1.008 g/mol)) = 0.0100 moles Mg(OH)2

From the balanced chemical equation, we know that 2 moles of HCl reacts with 1 mole of Mg(OH)2 to form 1 mole of MgCl2. Therefore, the moles of MgCl2 formed will be half of the moles of HCl, which is:

Moles of MgCl2 = 0.0385 moles HCl / 2 = 0.0193 moles MgCl2

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Which electron in magnesium is most shielded from nuclear charge?

Answers

An electron in the 3s orbital. The order of electron orbital energy levels starting from lowest to highest is as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

Explanation:

The sum of total charge of all the protons present inside the nucleus of an atom is known as the nuclear charge.

As the size of an atom increase there occurs a decrease in nuclear charge. This is because number of shells increases as the size of an atom increases. Therefore, force of attraction between the nucleus of the atom and its outermost electrons decreases.

It means electrons are shielded by the number of shells.

Due to this valence electrons can be easily lost by the atom in a chemical reaction.

Atomic number of magnesium is 12 and its electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}[/tex].

Hence, nuclear charge felt by the electrons present in 3s sub-shell will be the least.

Thus, we can conclude that electron is 3s subshell in magnesium is most shielded from nuclear charge.

If your lab procedure instructs you to add two parts of acid to each one part of water and you start with 25 ml of water, how much acid will you add, and how will you add it

Answers

When the ratio is given in parts, there is no strict rule on the units of measurement. It is a general term that is applicable to any unit. For example, the unit here is in mL. Since the ratio is 2 parts acid to 1 part water, that is also equivalent to 2 mL acid to 1 mL water. Hence, you have to add 2 mL of acid to water, not vice versa. Other acids are highly reactive to water. So, you have to add the acid slowly to avoid violent reactions.

What is a solid in which electrons are able to move about easily from one atom to another?

Answers

A conductor can move from one atom to another

What is the cost of 1.5 pound of sugar if sugar costs $1.37 per 5.0 pounds?

Answers

Set it up like a proportion. Answer: about $.41

What is the most important change in a chemical change?
1) identity
2)shape
3)size
4)form
5)state

Answers

5) state
when the state of the chemical changes that is the most important 

The density of a mystery solid is 1.00 g/cm3. will this float or sink in pure water?

Answers

Answer: The mystery solid will sink.

Explanation:

Density is defined as the ratio of mass and volume of the object. The formula used to calculate density is:

[tex]\text{Density of object}=\frac{\text{Mass of the object}}{\text{Volume of the object}}[/tex]

If the density of an object is less than the density of the liquid, the object will float in the liquid.If the density of an object is more than the density of the liquid, the object will sink in the liquid.

We are given:

Density of mystery solid = [tex]1.00g/cm^3[/tex]

We know that:

Density of pure water = [tex]0.9982g/cm^3[/tex]

As, the density of mystery solid is more than the density of water. So, the object will sink into the pure water.

Final answer:

The mystery solid will neither float nor sink in pure water.

Explanation:

The density of a mystery solid is 1.00 g/cm3. To determine whether it will float or sink in pure water, we need to compare the density of the solid with the density of water. If the density of the solid is less than the density of water (1.00 g/cm3), it will float. However, if the density of the solid is greater than the density of water, it will sink.

In this case, since the density of the mystery solid is equal to the density of water, 1.00 g/cm3, the solid will neither float nor sink in pure water. It will remain suspended at the water's surface.

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What should be done with an unused or used chemical once it has been taken from the original container?

Answers

If there is any unused Chemicals left in the container it should be properly disposed and chemicals taken out of the original container should not be poured back into the container because it can be contaminated

Scientific notation 0.000002

Answers

2x10^-6 Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10.

The exponent just on ten will be the amount of decimal points you advance. The scientific notation of 0.000002 is 2x10⁻⁶.

What is scientific notation?

Scientific notation is indeed a method of communicating numbers that are either too large or too little to be represented in decimal form. It is also known as 'scientific form' in the United Kingdom, and it is often used among scientists, mathematicians.

The first is merely the digits, with both the decimal place put after the very first digit, and the second is multiplication by 10 to a components impacting of decimal points, which places the decimal place where it used to be. Shift the decimal towards left of decimal point to ensure that there is 1 non-zero digit. The exponent just on ten will be the amount of decimal points you advance. The scientific notation of 0.000002 is 2x10⁻⁶.

Therefore, the scientific notation of 0.000002 is 2x10⁻⁶.

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5. for the following measurements is expressed to three significant figures? a) 0.007 m b) 7077 mg c) 7.30 x 10^-7 km d) 0.070

Answers

the answer is c
a) 1 sf
b) 4 sf
d) 2 sf

In which group do all atoms have two valence electrons in the ground state?

Answers

Alkaline Earths hope this helps

In the measurement 0.503 L , which digit is the estimated digit ?

Answers

The estimated digit is dependent on the least count of the instrument being used. If the least count is 0.1 and the reading is between two divisions of the least count, then the estimated digit will be in the tenths, or 0.1 place. In this case, the estimated digit is 3, meaning the least count is 0.001.

The estimated digit in the measurement 0.503 L is the last digit, 3.

In the measurement 0.503 L, the digit that is estimated is the last digit, which is 3. This is because precision in measurement dictates that the final digit reported is always the one that has some level of uncertainty or estimation. Therefore, in 0.503 L, the precise digits are 0, 5, and the estimated digit is 3.

What ability allows carbon atoms to form a large number of molecules?

Answers

Carbon bonding is the ability that allows carbon atoms to form a large number of molecules. The carbon atom is able to share four electrons in its outer shell with other atoms. The most common type of bond formed by carbon is a covalent bond.

What two substances are indicated by the cobalt chloride and limewater tests?

Answers

Cobalt chloride is most frequently used to test the presence of water. This is used to detect leaks in pipes and other supposed to be close containers like porcelain. The limewater test is used for testing the presence of carbon dioxide (CO2). This is used most commonly by the students to learn the chemistry of the common gases. 

Identify the species oxidized. 2 al3+(aq) + 2 fe(s) → 2 al(s) + 3 fe2+(aq)

Answers

To know the answer, compare the oxidation number of the element in the reactant and the product side. The oxidation number of Al was originally +3, then became 0 after the reaction. On the other hand, Fe was originally 0, then became +2 after the reaction. When the element is oxidized, it oxidation number increases. Thus, the element oxidized is Fe.

The species oxidized in the reaction is Iron Fe.

The oxidation number assigned to Al is +3

The  oxidation number assigned to Fe is +2

Here, in the reaction the oxidation number of iron Fe is increased to +3

Hence, we can conclude that the species oxidized in the reaction is Iron Fe.

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NH3 is nitrogen trihydride (ammonia) and BF3 is boron trifluoride. What is the name for AlCl3 and why?

Answers

its called aluminum chloride because it is actually is a molecular compound and has a valency of 3, making it stable.

Explanation:

In [tex]AlCl_{3}[/tex] compound, three chlorine atoms are attached to an aluminium atom.

Since atomic number of aluminium is 13 and it has three extra electrons. So, it donate single electron to each chlorine atom.

Therefore, octet of chlorine gets complete.

As, three chlorine atoms are attached to aluminium so, name of [tex]AlCl_{3}[/tex] is aluminium trichloride.

The softest and hardest minerals are?

Answers

The softest and hardest minerals are:

hardest: Diamond
softest: Talc

hope this helps
 

1. Talc 
2. Gypsum
3. Calcite
4. Fluorite
5. Apatite
6. Feldspar
7. Quartz
8. Topaz
9. Corundum
10. Diamond 

A mixture of 2 or more substances in which the molecules of the substances are evenly mixed

Answers

The answer is a Homogeneous Mixture.

Hope this helps

Almonds may be small, but they pack a great number of nutrients, including protein, vitamin E, and vitamin B2. Almonds also contain antioxidants and monounsaturated fat, a “good” type of fat that, like the omega-3 fatty acids, reduces the risk of heart disease.

Review the graph that represents the whole class data. Notice that the almond samples provide a large amount of chemical energy. What is the BEST explanation for this large amount of available energy?

A) Vitamins, like vitamin E and B2, contain large amounts of usable chemical energy.

B) Fats and proteins are molecules with many chemical bonds; the bonds release much energy when broken.

C) The energy provided by the almonds is related to mass rather than the chemical composition of the almond.

D) Monounsaturated fats, the good fats, contain many chemical bonds that release large amounts of chemical energy.

Answers

The answer B. Fats and proteins are molecules with many chemical bonds; the bonds release much energy when broken. Typically, our bodies would use the fat for energy. Proteins are used to build and run (enzymes) our body. But they can still be used as a source of chemical energy.

Option B is correct.

Why is the huronian supergroup rock formation particularly interesting to scientists

Answers

scientists enjoy the rocks
Final answer:

The Huronian Supergroup is interesting to scientists due to its age, the presence of primitive rock, and evidence of past watery environments. It gives unique insight into the planet's early history.

Explanation:

The Huronian Supergroup rock formation is particularly interesting to scientists for many reasons. This rock formation is known for being one of the oldest exposed rock formations available for study, providing crucial insights into the early history of the Earth.

One significant feature is the presence of primitive rock, which has largely escaped chemical modification by heating. This kind of rock is usually only found in comets, asteroids, and small planetary moons, so its presence on Earth in the Huronian Supergroup is of particular interest to scientists because this material represents the original material out of which the planetary system was created.

The presence of layered sedimentary rock with evidence of evaporation also suggests that this area was once underwater, possibly a shallow saltwater lake. The presence of hematite within the rocks, which forms only in watery environments, also supports this theory. This information is vital to creating accurate models of the past climates and environments of the planet.

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What is the mass of a sample of a substance with a volume of 120 ml and a density of 0.75 g/ml?

Answers

Answer:

Density=mass / volume.

0.75= mass / 120.

mass= 0.75×120.

mass=90g

Put the steps of the scientific method into the correct order.

Answers

The scientific method is a systematic way of questioning about the world around us and answering questions. The number of steps varies from one description to another, mainly when data and analysis are separated into separate step, but this is a fairly standard list of 6 scientific method steps, which you are expected to know for any science class:

1. Form a Hypothesis. This is a sort of educated guess about what you expect. 
2. Design an Experiment to test your hypothesis. An experiment has an independent and dependent variable. You change or control the independent variable and record the effect it has on the dependent variable.
3. Conduct Experiment
4. Record data and observations and analyze what the data means. Often, you'll prepare a table or graph of the data.
5. Form a Conclusion. Conclude whether to accept or reject your hypothesis. Communicate your results.

Answer:

Make a hypothesis ---> Conduct an experiment --->Analyze the experimental data ---> Communicate the results

Explanation:

How many additional valence electrons does bromine need to have a full valence shell?

Answers

The electron configuration of BROMINE is 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d¹⁰4p⁵, wherein the electrons with the highest quantum number are the 4s²4p⁵ electrons. Thus, Br has seven valence electrons.

By also searching for BROMINE on the Periodic Table, we could see from there that it belongs to Group 17 (in which all elements have seven valence electrons.)

Now that we know the number of valence electrons in all, we then apply the rule that inorder to achieve stability, the valence shell must have eight electrons.

7 + x = 8
x = 8 - 7
x = 1

Thus, BROMINE needs only ONE valence electron to have a full valence shell.

Answer:

one

Explanation:

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. how many kcal of energy does the cheeseburger contain? (the accepted caloric values for foods are 4.0 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.) report the answer to 2 significant figures.

Answers

We simply get the sum of the product of each mass and caloric values.

Total energy = 19 g * 9 kcal / g + 20 g * 4 kcal / g + 28 g * 4 kcal / g

Total energy = 363 kcal

 

Rounding of f to 2 significant fig:

Total energy = 360 kcal

The measure of heat and energy present in the fuel and food is called the calorific value. The calorific value is measured in kilojoule per kilogram (KJ/Kg)

The total energy of one meal is calculated by directly adding the energy given by carbohydrates, fats and proteins.

The energy can be calculated as:

Energy from 1 gm of carbohydrate = 4.0 kcal/g

       Then, the energy from 20 g of carbohydrate = 20* 4 kcal/g

       = 80 kcal/g

Energy from 1 gm of fats = 9.0 kcal/g

       Then, the energy from 19 g of fats= 19* 9 kcal/g

       = 171 kcal/g

Energy from 1 gm of protein = 4.0 kcal/g

       Then, the energy from 28 g of protein = 28* 4 kcal/g

       = 112 kcal/g

Now add the energy from all the constituents:

      Total energy = 80 kcal/g + 171 kcal/g + 112 kcal/g

       = 363 kcal/g

Therefore, the total amount of kcal of energy present in the cheeseburger is 363 kcal.

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Ted wants to hang a wall clock on the wall by using a string. If the mass of the wall clock is 0.250 kilograms, what should be the tension of the string so that it can sustain the weight of the wall clock?

Answers

the tension should be 0.25
T=mg+ma the formula for tension when object not moving.
T=tension
m=mass
g=acceleration of gravity
a=acceleration

a=0 since its not moving.

Since heat transfers take place only between systems with different temperatures, explain why the third law of thermodynamics is supported by our current understanding of matter

Answers

Final answer:

The third law of thermodynamics is aligned with our understanding of matter and heat transfer because it is consistent with the tendency of energy to spontaneously transfer from hotter to colder systems, a concept supported by the second law of thermodynamics and energy conservation principles.

Explanation:

The student's question addresses why the third law of thermodynamics is supported by our current understanding of matter, particularly considering that heat transfers occur only between systems with different temperatures. The third law of thermodynamics implies that as the temperature of a system approaches absolute zero, the entropy, or disorder, of the system approaches a minimum value. This law is supported by the fact that matter has a property called thermal conductivity, meaning that energy is transferred spontaneously from a higher temperature system to a lower temperature system because the disorder is more probable, and there is a tendency towards energy dispersion.

These concepts are also tied to heat, which is the process of energy transfer due to temperature differences, and the second law of thermodynamics, highlighting that energy transfers are never completely efficient and some energy is always lost as heat. Furthermore, the concept of energy conservation within the first law of thermodynamics states that the total energy of a system is conserved during such interactions. Overall, this understanding is crucial for comprehending the limitations and behaviors in the transfer of energy between systems.

By making two covalent bonds, an o atom (with 8 protons) fills its valence shell. why does the atom's charge stay close to zero

Answers

The electrons which are shared are no always near oxygen. Oxygen keeps six electrons to itself. And the four shared electrons travel between oxygen and other atoms and contributing four half-charges to oxygen. This provides oxygen about eight units of negative charge and this causes balance the number of protons in the atom. So this is the reason that by making two covalent bonds, an o atom (with 8 protons) fills its valence shell and atom's charge stay close to zero.

What is the density of a piece of wood that has a mass of 2.74 g and a volume of 3.10 cm3?

Answers

Density = Mass / Volume
Density = 2.74g / 3.10cm³
Density = 0.88 g/cm³
Final answer:

The density of the piece of wood is approximately 0.88 g/cm³.

Explanation:

The density of a substance can be calculated by dividing its mass by its volume. In this case, the mass of the piece of wood is 2.74 g and the volume is 3.10 cm³. To find the density, we divide the mass by the volume:



Density = Mass/Volume



Density = 2.74 g/3.10 cm³



Using a calculator, we find that the density of the piece of wood is approximately 0.88 g/cm³.

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Nickel metal is added to a solution of copper(ii) nitrate. express your answer as a chemical equation. identify all of the phases in your answer. enter no reaction if no reaction occurs.

Answers

Nickel is the 28th chemical in the periodic table and the chemical symbol of copper (II) nitrate is Cu(NO₃)₂. The chemical reaction that occurs between these compounds is a single-replacement reaction.

From the activity series of metals, nickel is able to replace copper in the compound and this is expressed in the balanced equation,

                      Ni(s) + Cu(NO₃)₂(aq) --> Cu(s) + Ni(NO₃)₂(aq)

The phases are also written in the equation. 

The chemical equation will be[tex]\rm \bold{Ni\;(s)+\;Cu(NO_3)_2\;(aq)\rightarrow\;Cu\;(s)+Ni(NO_3)_2\;(aq)}[/tex].

Nickel and Copper belong to group 4 of the periodic table. According to the trend, nickel has been more reactive than copper and has been able to displace copper in the compound.

The reaction between copper nitrate and nickel will be the displacement reaction.

The reaction will be:

[tex]\rm Ni\;+\;Cu(NO_3)_2\;\rightarrow\;Cu\;+Ni(NO_3)_2[/tex]

The reaction has nickel in the solid state, and copper nitrate in the aqueous state, the nickel nitrate solution will be formed with precipitated solid copper.

The reaction will be:

[tex]\rm \bold{Ni\;(s)+\;Cu(NO_3)_2\;(aq)\rightarrow\;Cu\;(s)+Ni(NO_3)_2\;(aq)}[/tex]

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Which of the following is an example of kinetic energy? (2 points) Select one: a. chemical energy b. gravitational energy c. nuclear energy d. thermal energy

Answers

Thermal energy: 
About to submit this quiz ill comment if I'm wrong

It would be Thermal Energy.
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