During an oil spill, oil coats the surface of the water, endangering sea life. Why doesn’t oil dissolve in ocean water

Answer:

It is A) A and wave B. The human ear would hear.

Explanation:

It is on Usa Test Prep and Wave A has a greater amplitude than wave B. That is perceived as a louder sound. Wave B has a higher frequency; that would be perceived as a higher pitch.

Hello! Since the object will sink in the water that has a density as 1.0, then it obviously cannot be D. If it floats at the Glycerin level at 1.26, then it cannot be C. An object or a substance can float on the exact level of density as water or liquids. The answer is B. Exactly 1.26 g/cm3. I hope I helped! Please mark me brainliest if you find suitable! Have a fantastic day! :)

It’s D honey, Object B, by 0.42 gram per cubic centimeter

Answer:

The answer is B. Place a 2 in front of the HCl

Ba + 2HCl → BaCl2 + H2

Explanation:

According to the law of the conservation of matter, no atom can create or destroy in a chemical reaction. Then the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products. Therefore, if the number of atoms is not equal, the equation must be balanced.

First you must determine the amount of atoms of each element present in both reagents and products. For that you must observe the subscripts next to each atom. In this case:

Reagents (left side of the reaction):

Products (right side of the equation):

You can see that there aren't the same number of atoms of Cl and H in reagents and products. So you have to balance the chemical reaction.

In a chemical equation, you can change coefficients, but you should never alter the subscripts. And it is always preferable not to start balancing with H. In this case, you start balancing the chlorine. For that you add the coefficient 2 to the HCl molecule to the right of the equation to balance it with the 2 Cl atoms to the left of the equation (present in BaCl2). So:

Ba + 2HCl → BaCl2 + H2

Now you must determine the amount of atoms of each element present in both reagents and products again to see if the reaction is balanced or not. Remember that by multiplying the coefficient by the subindice of each atom, you get the amount of that atom.

Reagents (left side of the reaction):

Products (right side of the equation):

You can see that you have the same amount of each atom on each side of the reaction. This means that the reaction is balanced.

So the answer is

Ba + 2HCl → BaCl2 + H2

and you placed a 2 in front of the HCL

I believe that in this case the controlled parameter is the type of animal that they are observing. There are a lot of animals in the ocean, therefore to have a scope of their study of observation, they are controlling or limiting their observations on the whale alone. Hence the controlled parameter is the type of animals, whales.

Answer:

to study the earth.

Explanation:

there are five branches.

geology-geologists- people who study the earth.

oceanography- oceanographers- people who study the oceans

environmental science- environmental scientists- people who study the environment.

meteorology- meteorologists- people who study the weather.

astronomy- astronomers- people who study the universe  beyond earth.

The energy of the X-ray photons with a wavelength of [tex]\(0.135 \, \text{nm}\)[/tex] is [tex]\(1.473 \times 10^{-18} \, \text{kJ}\)[/tex].

To calculate the energy of X-ray photons with a given wavelength, you can use the energy-wavelength relationship given by Planck's equation:

[tex]\[ E = \dfrac{hc}{\lambda} \][/tex]

Where:

Let's plug in the values:

[tex]\[ E = \dfrac{(6.626 \times 10^{-34} \, \text{J} \cdot \text{s}) \times (3.00 \times 10^8 \, \text{m/s})}{0.135 \times 10^{-9} \, \text{m}} \][/tex]

[tex]\[ E \approx \dfrac{(1.9878 \times 10^{-25} \, \text{J} \cdot \text{m})}{0.135 \times 10^{-9} \, \text{m}} \][/tex]

[tex]\[ E \approx 1.473 \times 10^{-15} \, \text{J} \][/tex]

Now, convert this energy from joules to kilojoules:

[tex]\[ E_{\text{kJ}} = \dfrac{1.473 \times 10^{-15} \, \text{J}}{1000} \][/tex]

[tex]\[ E_{\text{kJ}} \approx 1.473 \times 10^{-18} \, \text{kJ} \][/tex]

So, the energy of the X-ray photons with a wavelength of [tex]\(0.135 \, \text{nm}\)[/tex] is approximately [tex]\(1.473 \times 10^{-18} \, \text{kJ}\)[/tex].

The complete question: X-ray photons with a wavelength of 0.135 nm . express the energy numerically in kilojoules per mole.

To obtain 75 g of nickel from an ore that is 29.9% nickel by mass, approximately 0.252 kilograms of the ore would be required.

This type of problem is a matter of conversion between the mass of the ore overall and the mass of the specific component, in this case, nickel. The ore is 29.9% nickel by mass, which means for every 100 g of ore, there are 29.9 g of nickel.

To find out how much ore is needed to yield 75 g of nickel, we can set up a proportion: (29.9 g nickel / 100 g ore) = (75 g nickel / x g ore).

Solving for x, we find x = (75 g nickel * 100 g ore) / 29.9 g nickel = approximately 251.67 g ore.

This is the mass of the ore required in grams. Since the question asks for the answer in kilograms, we will need to convert this to kg. Knowing that 1 kilogram = 1000 grams, we divide the answer by 1000 and find that approximately 0.252 kg of the ore would need to be dug up in order to have 75.0 g of nickel.

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Final answer:

Gases are not a part of every chemical reaction, unlike reactants, products, and energy changes which are essential components of all reactions.

Explanation:

What is not part of every chemical reaction? The answer is C. gases. While every chemical reaction involves reactants and products, and energy changes (either absorption or release), not all chemical reactions produce or involve gases. Reactants are the substances present at the beginning of a reaction, and products are the substances formed as a result of the reaction. Energy is a fundamental component of chemical reactions, as it is either released or absorbed during the process. In contrast, the production of gases is specific to certain types of reactions and is not a universal aspect of all chemical reactions.

In every chemical reaction, energy is not always a part of the reactants or products involved. While reactants and products are essential components of a chemical reaction, gases and energy are not universally present in every reaction.

A balanced chemical equation should have same number of same kind of atoms with the same charge on both the sides of reaction.

In other words, a chemical reaction where the number of atoms for each element in the reaction and the total charge on them are the same, for both the reactants and the products is called as a balanced chemical equation.

Also, the mass and the charge should balanced on both sides of the reaction.

Final answer:

The best description of a balanced chemical equation is that it has the same number of the same kind of atoms on both sides, reflecting the conservation of matter. Balancing involves adjusting coefficients to achieve this equality.

Explanation:

The statement that best describes a balanced chemical equation is 'D. There are the same number of the same kind of atoms on either side of the reaction.' Balancing a chemical equation ensures compliance with the law of conservation of matter, indicating that atoms are neither created nor destroyed in a chemical reaction.

To balance a chemical equation, we insert coefficients in front of the appropriate reactants or products until there is the same number and type of atoms on both sides of the arrow. For instance, if a reaction produces CO₂ and H₂O, we would count the oxygen atoms in both molecules to ensure they match the total number of oxygen atoms in the reactants.

Therefore, balancing equations is a fundamental process in chemistry that illustrates the conservation of atoms during chemical reactions and ensures that the numbers of each type of atom are equal on both sides of the equation.

The density of the object can be calculated using the formula Density = Mass / Volume. With the given mass of 40g and an volume of 31 cm³, the calculated density is 1.29 g/cm³.

The essential formula to remember here is: Density = Mass / Volume (represented as p=m/v), which you can use to calculate the density of any object if you know its mass and volume.

In this scenario, the mass (m) is given as 40g and the volume (V) as 31 cm³. Substituting m and V into the density formula gives:

Density = 40g / 31 cm³ = 1.29 g/cm³

Therefore, the density of the object in question is 1.29 g/cm³.

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Final answer:

The mass of 36 dm3 of CO2 at room temperature is 66.02 grams, calculated by first determining the number of moles and then multiplying by the molar mass of CO2.

Explanation:

To calculate the mass of 36 dm3 of CO2 at room temperature, we can use the molar volume of a gas at room temperature, which is approximately 24 dm3/mol. Given that the molar mass of CO2 is 44.01 g/mol, we can first find the number of moles of CO2 by dividing the volume by the molar volume.

Number of moles = Volume / Molar volume = 36 dm3 / 24 dm3/mol = 1.5 moles

Now, to find the mass, we multiply the number of moles by the molar mass of CO2.

Mass = Number of moles × Molar mass = 1.5 moles × 44.01 g/mol = 66.02 g CO2

Explanation:

Since it is given that object A has greater mass this means that object A is heavier than object B.

Therefore, when both object A and object B is placed on a balance scale on either side then the balance scale will move downwards on the side where object of heavier mass is placed.

That is, balance scale will be in downward direction where object A is placed. Whereas balance scale will move upwards where object B is placed.

To calculate the volume of a piece of iron, we need to use the formula: Volume = Mass / Density. First, convert the density from g/cm^3 to kg/dL, then substitute the given mass and density into the formula. By converting the final volume from cm^3 to dL, the answer will be in the desired units.

To calculate the volume of a piece of iron with a given mass, we need to use the formula:

Volume = Mass / Density

First, we need to convert the density from g/cm3 to kg/dL. There are 10 g in 1 dL and 1,000 cm3 in 1 L, so:

Density = 7.86 g/cm3 x (1 dL/10 g) x (1 L/1,000 cm3)

Now, we can substitute the given mass of 3.52 kg and the converted density into the formula to find the volume:

Volume = 3.52 kg / (converted density)

After calculating the value, we can convert the final volume from cm3 to dL by recognizing that 1 cm3 is equal to 0.1 dL.

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The small, central core of an atom. The nucleus of an atom is made up of both  protons "positive charges" and neutrons "no charge."

fireworks exploding is the answer

Answer is B. Fireworks Exploding.

I would say D.  

A is incorrect by simple reasoning.

B is also incorrect. A hypothesis is made before evidence supports it, therefore, it doesn't matter if all evidence supports it,  as it shows an guess. It sometimes can also lead to more experimentation even if it's not true for the current experiment.

C is also incorrect. An untestable hypothesis isn't useful as you cannot test anything relating to it, and it cannot be proven or disproven.

Hope this helps!

The statement that is true regarding scientific hypotheses B. A testable hypothesis is valuable, even if evidence shows that it is false.

In the scientific method, a hypothesis is a proposed explanation for a phenomenon or observed behavior. A testable hypothesis is one that can be tested through experiments or observations. Even if the evidence shows that the hypothesis is false, it is still valuable because it helps researchers eliminate incorrect explanations and refine their understanding of the topic.

For example, let's say a researcher hypothesizes that a new drug will cure a particular disease. They conduct experiments and analyze the data, only to find that the drug does not have the desired effect. The hypothesis may be proven false, but the research process can still provide valuable insights and pave the way for new hypotheses or solutions.

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Final answer:

Magnetism is not an intensive physical property, while boiling point, thermal conductivity, and volume are examples of intensive physical properties.

Explanation:

An intensive physical property is a property that does not depend on the amount of the substance and physical state at a given temperature and pressure. Out of the given options, magnetism is not an intensive physical property because it depends on the presence of a magnetic field and can vary depending on the strength of the field. On the other hand, boiling point, thermal conductivity, and volume are all examples of intensive physical properties as they do not depend on the amount of the substance.

Usually the uncertainty of a graduated cylinder is given however if it is not, then it is simply assumed to be equal to half of the least interval of that instrument. In this case, the least interval is 10 ml, so half of this is 5 ml. Hence, the graduated cylinder has an uncertainty of +/- 5 ml