While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame,
the speed of the tennis ball is
km/h

Answer:

1st answer B. Bromine

2nd answer B. magnesium

Explanation:

Hello There!

Which of the following is a non metal that remains liquid at room temperature? "OPTION B"

Chlorophyll is a naturally occurring chelate compound in which central metal is "OPTION B"

To find the number of molecules in 3.6 grams of NaCl, convert the grams to moles of NaCl using its molar mass and then multiply the number of moles by Avogadro's number (6.02 x 10^23). The result is approximately 3.7 x 10^22 molecules.

To find out how many molecules are in 3.6 grams of NaCl, first calculate the number of moles of NaCl. Each mole of NaCl has a mass of 58.44 grams (sum of atomic masses of Na and Cl). So, 3.6 grams corresponds to 3.6/58.44 = 0.0616 moles.

Now, use the Avogadro's number which states that one mole of any substance contains 6.02 x 10^23 molecules. So, 0.0616 moles of NaCl would contain approximately 0.0616 x 6.02 x 10^23 = 3.7 x 10^22 molecules.

In conclusion, the number of molecules in 3.6 grams of NaCl is approximately 3.7 x 10^22.

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To find the number of molecules in 3.6 grams of NaCl, first calculate the number of moles (0.0615 moles), then convert this to molecules using Avogadro's number, resulting in approximately 3.70 x 10²² molecules.

To determine the number of molecules in 3.6 grams of NaCl, follow these steps:

              Number of moles of NaCl = 3.6 g / 58.5 g/mol ≈ 0.0615 moles

         Number of molecules = 0.0615 moles x 6.022 x 10²² molecules/mole ≈ 3.70 x 10²² molecules

Therefore, there are approximately 3.70 x 10²² molecules in 3.6 grams of NaCl.

Answer:

[tex]\boxed{\text{pH = 5.00}}[/tex]

Explanation:

Step 1. Calculate the pOH

pOH =-log[OH⁻]

pOH =-log(1.0 × 10⁻⁹)

pOH = 9.00

Step 2. Calculate the pH

pH + pOH = 14.00

pH + 9.00 = 14.00

[tex]\boxed{\textbf{pH = 5.00}}[/tex]

Final answer:

The pH of a solution with a hydroxide ion concentration of 1.0 × 10⁻⁹ M is 5, indicating the solution is acidic.

Explanation:

To calculate the pH of a solution with a known hydroxide ion concentration, we can use the relationship between the concentration of hydroxide ions ([OH-]) and hydrogen ions ([H+]), which is given by the ionic product of water (Kw = 1.0 × 10⁻¹⁴ at 25°C). The pH is defined as the negative logarithm of the hydrogen ion concentration, pH = -log([H+]).

Since we have the hydroxide ion concentration ([OH-] = 1.0 × 10⁻⁹ M) we can find the hydrogen ion concentration from Kw:

Kw = [H+] × [OH-]

[H+] = Kw / [OH-]

[H+] = (1.0 × 10⁻¹⁴ M2) / (1.0 × 10⁻⁹ M)

[H+] = 1.0 × 10-5 M

Now we can calculate the pH:

pH = -log([H+])

pH = -log(1.0 × 10⁻⁵)

pH = 5

A pH of 5 indicates that the solution is acidic, as a pH less than 7 is characteristic of an acidic solution.

Answer:

141.1g

Explanation:

The formula of ammonia is written as NH₃

Given parameters:

Number of particles = 5.0 x 10²⁴atoms

To calculate the mass of the substances that makes up this number of ammonia particles, we follow use the mole concept to derive it.

1. We know that a mole is the amount of a substance that contains the Avogadro's number of particles i.e 6.02 x 10²³

From this, we can then derive the number of moles using the expression below:

Number of moles =

number of particles/6.02 x 10²³

2. With the number of moles, we can deterime the mass using the expression below:

Number of moles= mass/molar mass

Mass(g) = number of moles x molar mass

Solution

From step 1:

Number of moles = 5.0 x 10²⁴ / 6.02 x 10²³

No of moles of NH₃ = 0.83 x 10 = 8.3mol

Step 2:

Molar mass of NH₃:

Atomic mass of N = 14gmol⁻¹

H = 1gmol⁻¹

Molar mass = 14 + (1x3) = 17gmol⁻¹

Using the expression:

Mass(g) = number of moles x molar mass

Mass of NH₃ = 8.3 x 17 = 141.1g

Answer:

It would be 30km

Explanation:

The approximate straight-line distance between Red Bank and Belleville, presumably in New Jersey, USA, is about 30 kilometers, making 'option D: 30 km' the correct choice from the given options.

The distance between Red Bank and Belleville can vary based on the specific locations in each place, the method of travel, and the route that is chosen. However, to determine the approximate distance between these two locations, one might use a mapping service or tool. Assuming these are the towns in New Jersey, USA, and using a direct path (as the crow flies), the distance is about 30 kilometers. Therefore, out of the options provided, the answer would be option D: 30 km. Note that real-world road distances might be different because roads do not always make straight, direct paths between locations.

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Metals- • Lustrous (shiny)

• Good conductors of heat and electricity.

• High melting point.

• High density (heavy for their size)

• Malleable (can be hammered)

• Ductile (can be drawn into wires)

• Usually solid at room temperature (an exception is mercury)

• Opaque as a thin sheet (can't see through metals)

Non-metal- • High ionization energies.

• High electronegativities.

• Poor thermal conductors.

• Poor electrical conductors.

• Brittle solids—not malleable or ductile.

• Little or no metallic luster.

• Gain electrons easily.

• Dull, not metallic-shiny, although they may be colorful.

Metalloid-Are generally solids

Metals are lustrous, malleable, ductile, good conductors of heat and electricity,Non-metals are brittle, dull, and poor conductors of heat and electricity,Metalloids they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.

Metals are lustrous, malleable, ductile, good conductors of heat and electricity,Non-metals are brittle, dull, and poor conductors of heat and electricity,Metalloids they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.

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Answer:

Homogeneous because if you were to take a sip it would be the same all throughout the juice, nothing changes. Hope this helped, please mark me the brainliest answer? Have a good day :)

Answer:

Explanation:

heterogeneous

Answer:

what are the options because a graduated cylinder is a science mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid

Explanation:

Answer: The molar mass of magnesium nitrate is 148.3148 g/mol.

Explanation:

The molar mass of [tex]Mg(NO_3)_2[/tex] is approximately 148.33 grams/mole.

Calculating the total mass of one mole of the chemical [tex]Mg(NO_3)_2[/tex] (magnesium nitrate) is necessary to determine its molar mass. The molar mass is determined by adding the atomic masses of all the components of the compound, taking into account the value of each subscript.

The elements involved have the following atomic masses:

Magnesium (Mg) = 24.31 grams/mole

Nitrogen (N) = 14.01 grams/mole

Oxygen (O) = 16.00 grams/mole

Magnesium nitrate [tex](Mg(NO_3)_2)[/tex] consists of one magnesium atom (Mg), two nitrate ions [tex](NO^3^-)[/tex], and their respective subscripts.

This formula can be used to obtain the molar mass:

Molar mass of [tex]Mg(NO_3)_2[/tex]=  (1 × Mg) + (2 × (N + (3 × O)))

Molar mass of [tex]Mg(NO_3)_2[/tex]= (1 × 24.31) + (2 × (14.01 + (3 × 16.00)))

Molar mass of [tex]Mg(NO_3)_2[/tex]= 24.31 + (2 × (14.01 + 48.00))

Molar mass of [tex]Mg(NO_3)_2[/tex]=24.31 + (2 × 62.01)

Molar mass of [tex]Mg(NO_3)_2[/tex]=24.31 + 124.02

Molar mass of [tex]Mg(NO_3)_2[/tex]= 148.33 grams/mole

Therefore, the molar mass of [tex]Mg(NO_3)_2[/tex] is approximately 148.33 grams/mole.

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I think C is the perfect answer. This is because if the govermental funding do not provide a way to control the scientific research, then scientists might done their jobs illegally as they can do anything to complete their experiment and research.

Answer:

Explanation:

Specifically, scientific research can be defined as an activity developed by researchers, aiming at new discoveries and thus contributing to the quality of intellectual life. Still, the research includes some of the activities developed during academic life, which requires from the researcher some skills necessary for the full development of their functions, such as planning, knowledge and adaptation to scientific norms.

Scientific research is very important for the development of the country, and for a scientific research to be completed and to achieve good results, this research needs funding, to buy equipment and other elements necessary for the research to be carried out. It is very important for research to receive government funding, as government usually provides more funding than private companies, especially in research done in underdeveloped countries.

Answer:

191.4 g.

Explanation:

Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g),

It is clear that 1.0 mole of Fe₂O₃ react with 3.0 mole of CO to produce 2.0 moles of Fe and 3.0 moles of CO₂.

Using cross multiplication:

2.0 mol of Fe produced with → 3.0 mol of CO₂, from stichiometry.

2.9 mol of Fe produced with → ??? mol of CO₂.

∴ The no. of moles of CO₂ produced = (3.0 mol)(2.9 mol)/(2.0 mol) = 4.35 mol.

∴ The mass of CO₂ produced = no. of moles x molar mass = (4.35 mol)(44.0 g/mol) = 191.4 g.

Answer:

D. sulfur dioxide and nitrogen oxides dissolve in rainwater

Explanation:

Sulfur dioxide and nitrogen oxides are by products of fossil fuel combustion. The bulk of these gases are released into the atmosphere. When these gases gets to the atmosphere, they combine with rain water to form acid rain.

The oxides, sulfur dioxde and nitrogen oxides are non-metallic oxides. They are acid oxides that combines with water to produce an acid.

Burning of fossil fuels release these gases and they combine with rain water to form acid rain.

Acid rain is very corrosive and greatly affects the ecosystem.

Answer:

the answer is elevation

Answer: C. Elevation

Answer:

Nuclear Chain Reactions. A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).

Explanation:

A nuclear chain reaction occurs when an initial reaction causes more reactions, generating recurring secondary reactions, forming a self-sustaining chain, much like a domino effect. This process is common in nuclear fission and fusion.

In a nuclear chain reaction, an initial reaction causes excess neutrons to be emitted. These neutrons then cause other similar nuclear reactions, generating more neutrons and thus, more nuclear reactions. This sequence forms a self-sustaining chain. This is common in both nuclear fission, as seen in nuclear power plants and atomic bombs, or in a controlled manner in nuclear fusion, as is being researched for future clean energy solutions. It's like a domino effect but with atomic nuclei and neutrons.

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Answer:

The train is moving at the speed of 22.36 meters per second

Explanation:

Speed of the train  = 50 .0 miles/hour

1 mile = 1.61 km

50 miles = [tex]50.0\times 1.61 km=80.5 km[/tex]

1 km = 1000 m

1 hour = 3600 seconds

So,the speed of the train in meter per seconds:

[tex]=\frac{80.5\times 1000 m}{3600 s}=22.36 m/s[/tex]

D. Neutron-emitting material

Answer: The correct answer is Option D.

Explanation:

Nuclear control rods are defined as the rods which are used in nuclear reactor plants to control the fission rate of uranium and plutonium.

These rods are made up of few chemical elements like boron, silver, indium and cadmium. These rods have the capability of absorbing many neutrons without getting fissioned itself.

Thus, from the above information, the correct answer comes out to be Option D.

Answer:

c

Explanation:

If chemical equation neads heat to happen it's caled endothermic

eg. CaCO3 ---> CaO + CO2 (there is supposed to be a little t above the arrow)

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products. Hence, option C is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products

In an endothermic reaction, the products are higher in energy than the reactants.

Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the reaction.

Hence, option C is correct.

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Answer:

B. A chemical change occurred which caused the liquid's physical properties to change.

Explanation:

The reduction of the temperature of the system meant that the reaction absorbed heat energy from it. This shows that a chemical reaction was in progress. New products were formed, and this is proved by the change in the color to blue.  

Answer: Option (B) is the correct answer.

Explanation:

A chemical reaction in which energy is absorbed by the reactant molecules is known as endothermic reaction. In this type of reaction there occurs decrease in temperature.

For example, Justin mixed two clear liquids together during an experiment and he noticed that decrease in temperature occurs without any refrigeration or other action to change the temperature.

Then it means an endothermic reaction has occurred.

Sometimes, chemical changes also leads to change in color of the reaction mixture.

Whereas a chemical reaction in which energy is released by the reactant molecules is known as exothermic reaction. In this type of reaction there occurs an increase in temperature.

A physical change is that change which does not lead to any difference in chemical properties of a substance.

For example, mass, density, etc are all physical properties.

On the other hand, a chemical reaction is that change which leads to change in chemical properties of a substance.

For example, combustion, toxicity, etc are all chemical properties.

Thus, we can conclude that the statement a chemical change occurred, and this caused the liquid’s physical properties to change, best describes Justin’s experiment.

Final answer:

An acid-conjugate base pair is when an acid donates a proton to form a conjugate base, or when a base accepts a proton to form a conjugate acid. The strength of an acid is inversely related to the strength of its conjugate base, with strong acids having weak conjugate bases and vice versa.

Explanation:

An acid-conjugate base pair involves a unique relationship in chemical reactions, particularly in the Brønsted-Lowry acid-base theory. In this concept, an acid and a base differ by just one hydrogen ion (H+).

Essentially, if an acid donates an H+ ion, it forms its conjugate base, and if a base accepts an H+ ion, it becomes its conjugate acid.

An example of such a pair is hydrofluoric acid (HF) and fluoride ion (F−), where HF is the parent acid and F− is the conjugate base. Another example is the water molecule (H₂O) acting as a base to form the hydronium ion (H₃O+), its conjugate acid.

A general rule in acid-base chemistry is that the strength of an acid is inversely related to the strength of its conjugate base.

The relative strength of acid-conjugate base pairs is thus an important concept; strong acids have very weak conjugate bases, while strong bases form very weak conjugate acids upon acceptance of a proton.

This relationship helps predict the direction of acid-base reactions and the position of equilibrium.

Final answer:

An acid-conjugate base pair is derived from an acid losing a proton to become its conjugate base; for instance, CH₃CO₂H and CH₃CO₂⁻ make up such a pair. The strength of an acid is inversely related to its conjugate base.

Explanation:

An acid-conjugate base pair consists of two species that differ by the presence or absence of a proton (H+). According to the Brønsted-Lowry theory, an acid is a proton donor and a base is a proton acceptor. When an acid donates a proton, it becomes its conjugate base, and when a base accepts a proton, it becomes its conjugate acid. For example, when we take the acetic acid (CH₃CO₂H) and it donates a proton (H+), it forms the acetate ion (CH₃CO₂⁻), making CH₃CO₂H and CH₃CO₂⁻ a conjugate acid-base pair. Similarly, water (H₂O) can accept a proton to become hydronium (H₃O+), creating the conjugate acid-base pair H₂O and H₃O+.

The relative strength of an acid and its conjugate base is inversely related: the stronger the acid, the weaker the conjugate base, and vice versa. Therefore, the conjugate base of a strong acid like hydrochloric acid (HCl) is a weaker base (Cl⁻), and the conjugate acid of a strong base like hydroxide (OH⁻) is a weaker acid (H₂O).

A decrease in temperature [E] is generally not a cause of chemical reactions. Other factors like the transfer of electrons, formation of a solid, water or gas are common causes.

The most common factors that can cause chemical reactions to occur include the transfer of electrons, formation of a solid, formation of water, and formation of a gas. However, the option that does not generally cause a chemical reaction to occur is a decrease in temperature [E]. In fact, an increase in temperature typically facilitates chemical reactions as it increases the energy of the particles involved, making them more likely to react.

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Most commonly, chemical reactions occur due to the transfer of electrons, the formation of a solid, the formation of water, or the formation of a gas. A decrease in temperature is not typically a factor that facilitates chemical reactions.

The most common factors that cause chemical reactions to occur include the transfer of electrons, the formation of a solid, the formation of water, and the formation of a gas. These actions involve breaking and forming chemical bonds that result in new substances. However, a decrease in temperature is typically not a factor that causes chemical reactions. In fact, an increase in temperature is more likely to cause a chemical reaction as it provides the necessary energy for the particles to react.

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Answer:

The pendulum would stop swinging because the kinetic energy would slow down for the friction is causing it to slow. The energy would go into potential energy.

Answer:

friction/heat

Explanation:

the pendulum would eventually stop swinging dude to friction in the air. the friction makes heat even if it is the smallest amount it is still energy. the pendulum would eventually stop due to friction which makes heat

New York City is close to an ocean and to the great lakes.

Utah is one of the landlocked states.

B. New York City is close to an ocean, while Utah is landlocked.

Thanks

The answer is B. New York City is close to an ocean while Utah is landlocked (landlocked means that it has land on all sides)

If you are confused look at the map below (First pic is Utah and second one is NYC)

Hope this helped!

~Just a girl in love with Shawn Mendes

Answer:

1. Theory

2. evidence

3. theory

4. Today, natural sciences are more commonly divided into life sciences, such as botany and zoology; and physical sciences, which include physics, chemistry, geology, astronomy, and materials science.

5.In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time. Theories also allow scientists to make predictions about as yet unobserved phenomena".

7.Empirical evidence is information acquired by observation or experimentation. Scientists record and analyze this data. The process is a central part of the scientific method

8. Field research is a research conducted in the real world or a natural setting. It tends to observe, analyze, and describe what exists rather than manipulating a factor under study .On the other hand, controlled laboratory research is a research conducted in a setting specifically designed for research

10.You would say Scientific knowledge is always being changed and performed in different ways. Scientific knowledge is always being changed as scientist are experiencing and collecting new information everyday using the scientific method.

6.In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.

Answer:

0.29mol/L or 0.29moldm⁻³

Explanation:

Given parameters:

Mass of MgSO₄ = 122g

Volume of solution = 3.5L

Molarity is simply the concentration of substances in a solution.

Molarity = number of moles/ Volume

>>>>To calculate the Molarity of MgSO₄ we find the number of moles using the mass of MgSO₄ given.

Number of moles = mass/ molar mass

Molar mass of MgSO₄:

Atomic masses: Mg = 24g

S = 32g

O = 16g

Molar mass of MgSO₄ = [24 + 32 + (16x4)]g/mol

= (24 + 32 + 64)g/mol

= 120g/mol

Number of moles = 122/120 = 1.02mol

>>>> From the given number of moles we can evaluate the Molarity using this equation:

Molarity = number of moles/ Volume

Molarity of MgSO₄ = 1.02mol/3.5L

= 0.29mol/L

IL = 1dm³

The Molarity of MgSO₄ = 0.29moldm⁻³

Explanation:

Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. So, it means there is only one valence electron present in a sodium atom. This valence electron is represented by a dot in the Lewis structure.

Atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7. So, it means there are seven valence electrons present in a chlorine atom. These valence electrons are represented by seven dots in the Lewis structure.

Also, in order to attain stability sodium will lose one valence electron and this valence electron will be gained by chlorine atom.

Therefore, an arrow pointed from dot near Na to Cl shows that an electron is being donated from Na to the Cl atom.

The salt formed from the reaction between HBr and NaOH is sodium bromide (NaBr), which is the result of a neutralization reaction involving the combination of hydroxide ions from the base with hydrogen ions from the acid, and the combination of sodium ions from the base with bromide ions from the acid.

The salt formed from the acid/base reaction between HBr (hydrobromic acid) and NaOH (sodium hydroxide) is called sodium bromide (NaBr). When these two reactants combine in a neutralization reaction, the hydroxide ions (OH⁻) from the base react with the hydrogen ions (H⁺) from the acid to produce water (H₂O), and the remaining sodium ions (Na⁺) from the base combine with the bromide ions (Br⁻) from the acid to form the salt sodium bromide (NaBr).

This can be represented by the chemical equation:

NaOH (aq) + HBr (aq) rightarrow NaBr (aq) + H2O (l)

A salt is generally an ionic compound made up of the cation from a base and the anion from an acid. As HBr is a strong acid and NaOH is a strong base, the resulting sodium bromide solution has a neutral pH, similar to sodium chloride (NaCl).

The introduction of the measles vaccine in the US in 1960 led to a significant decrease in the number of measles cases.

The information on the graph shows the number of measles cases in the US between 1954 and 2008. The graph shows that the measles vaccine was introduced in 1960. From the graph, we can conclude that the introduction of the measles vaccine led to a significant decrease in the number of measles cases in the US. Prior to the vaccine, there were fluctuating numbers of cases, but after the vaccine was introduced, the number of cases dropped to almost zero.

Answer:

CH₃CH(CH₃)CH(C₃H₇)CH₂CH(CH₃)₂:

4-isopropyl-2-methylpentane.

Explanation:

Step One: Draw the structure formula of this compound. Parentheses in the formula indicate substitute groups that are connected to the carbon atom to the left.

For example, the first (CH₃) indicates that the second carbon atom from the left is connected to:

Each carbon atom in this compound is connected to four other atoms. All bonds between carbon atoms are single bonds.

The C₃H₇ in the second pair of parentheses is the condensed form of CH₃CH₂CH₂-. See the first sketch attached. Groups in parentheses are highlighted.

Step Two: Find the carbon backbone. The backbone of a hydrocarbon is the longest chain of carbon atoms that runs through the compound. See the second sketch attached. The backbone of this compound consists of seven carbon atoms and is highlighted in green. The name for this backbone shall be heptane.

Step Three: Identify and name the substitute groups.

The two substitute groups are circled in blue in the second sketch.

Step Four: Number the atoms.

Isopropyl shall be placed before methyl. Start from the right end to minimize the index number on all substitute groups. The methyl group is on carbon number two and the isopropyl group on carbon number four. Hence the name:

4-isopropyl-2-methylheptane.

Answer: A. one atom

Explanation: i did some research on it and that is what i found.

One molecule of H₂SO₄ comprises one atom of sulfur. Thus, option A is correct.

Acid rain is given as the precipitation that has been comprising the chemical compound acidic in nature, thereby the pH of the precipitation as well.

The number of atoms in a molecule can be determined with the chemical formula. The subscript to an element in the formula is corresponding to the number of atoms of element present in the molecule or atom.

In the molecule of H₂SO₄,  the subscript number to the hydrogen atom is 2, thereby 2 hydrogens are present, and the subscript to the sulfur is the representation of the number of atoms of sulfur in the molecule that stands for 1.  

Therefore, 1 atom of sulfur is present in the molecule of H₂SO₄. Thus, option A is correct.

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Solution here,

Volume(V)=67.4 L

Pressure(P)=1 atm

Temperature(T)=(0+273)K=273K

Universal gas constant(R)=0.0821 L.atm.mol^-1K^-1

No. of moles(n)=?

Now,

PV=nRT

or, 1×67.4=n×0.0821×273

or, 67.4=22.4n

or, n=67.4/22.4

or, n=3

therefore, required no. of mole is 3.