Which of the following most likely happens when astronauts go to space?

1. Their heart rate speeds up because the blood vessels have less blood to circulate.

2. Their heart rate speeds up because the blood vessels have more blood to circulate.

3. The blood vessels in their neck caves in because the heart pumps less blood per beat.

4. The blood vessels in their neck bulges out because the heart pumps more blood per beat.

Question: A 14.630 g milk chocolate bar is found to contain 9.315 g of sugar

How many milligrams of sugar does the milk chocolate bar contain

Answer:

"9315 mg" of sugar has the milk chocolate bar

Explanation:

Given that the  14.630 g milk chocolate has  9.315 g of sugar

We have to convert 9.315 grams to milligrams

We know that 1 gram  =  1000 mg

So

9.315 gram =  [tex]9.315 \times 1000[/tex]

9.315 gram =  9315 mg                          

Therefore, the milk chocolate bar has 9315 mg of sugar.

The law of conservation of matter, a key principle in chemistry, dictates that the total mass of reactants equals the total mass of products in a chemical reaction. It's applied by balancing chemical equations so that the number of atoms of each element remains constant before and after the reaction. Balancing in terms of moles also reflects this law, ensuring the same amount of each element is present throughout the reaction.

The law of conservation of matter is a fundamental principle in chemistry, stating that matter is neither created nor destroyed during a chemical reaction. In other words, the total mass of the reactants must be equal to the total mass of the products. This law is applied when balancing chemical equations, ensuring that there is the same number of each type of atom on both the reactant and product sides of the equation.

To illustrate, consider a simple chemical reaction where hydrogen gas reacts with oxygen gas to form water:
2 H₂ (g) + O₂ (g) -> 2 H₂O (l).
Balancing this equation, we ensure that there are four hydrogen atoms and two oxygen atoms on both sides, reflecting the conservation of matter. No matter is lost or gained in the process; it is simply rearranged into a different form.

When dealing with stoichiometry and balancing chemical equations in terms of moles, the same principle applies. The number of moles of each element must be conserved across the reaction. This means that for a reaction balanced in moles, the total number of moles of each element in the reactants will equal the total number of moles of each element in the products, satisfying the law of conservation of matter.

Answer:

X = ²³⁵₉₂U

Explanation:

The isotope of plutonium-239 undergo alpha decay and produced uranium-235.

Nuclear equation:

²³⁹₉₄Pu    →   ²³⁵₉₂U + ⁴₂He

Alpha decay:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Answer:

[tex]235 \atop 92} \right.[/tex] U.

Explanation:

Answer:

675 joule

Explanation:

mass of the branch=15 kg

gravity=9. 8 m/s^2

height=4. 5 m

now,

potential energy=mass×gravity×height

=15kg ×9. 8 m/s^2 ×4. 5 m

=675 j

Answer: PE = 662 J

Explanation: Potential Energy is the product of mass, gravity and height.

PE = mgh

= 15 kg x 9.8 m/s² x 4.5 m

= 662 J

Answer:

1) mass ZnO = 55.155 g

2) V SO2(g) = 18.289 L

Explanation:

1) Zn + H2O  → ZnO + H2

∴ mass Zn = 41.6 g

∴ mm Zn = 65.38 g/mol

⇒ mol Zn = (41.6 g)(mol/61.38 g) = 0.678 mol Zn

⇒ mol ZnO = (0.678 mol Zn)(mol ZnO/mol Zn) = 0.678 mol ZnO

∴ mm ZnO = 81.38 g/mol

⇒ mass ZnO = (0.678 mol ZnO)(81.38 g/mol) = 55.155 g ZnO

2) S(s)  + O2(g)  →  SO2(g)

∴ mass S(s) = 24 g

∴ T = 25°C ≅ 298 K

∴ P = 1 atm

∴ mm S(s) = 32.065 g/mol

⇒ mol S(s) = (24 g)(mol/32.065 g) = 0.7485 mol S(s)

⇒ mol SO2(g) = (0.7485 mol S(s))(mol SO2(g)/mol S(s)) = 0.7485 mol SO2(g)

ideal gas:

⇒ V SO2(g) = ((0.082 atm.L/K.mol)(298 K)(0.7485 mol))/(1 atm)

⇒ V SO2(g) = 18.289 L SO2(g)

Answer:

87.5

Explanation:

1300-950=350

350/4 =87.5

The difference between 1300 and 950 is 350. When you divide this difference by 4, you find that the answer is 87.5.

In this mathematics problem, you are tasked with finding the difference between two numbers: one thousand three hundred (1300) and nine hundred fifty (950). The difference between these two numbers is 350. The next step as described in the question is to divide this difference by 4. So, 350 divided by 4 equals 87.5. Therefore, the solution to this problem is 87.5.

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Answer:

C

Explanation:

Cheese is rotten milk

Answer:

The answer is C, Cheddar Cheese

Answer: the relative molecular mass of the compound

Explanation:

Answer:

5.41 x 10²² g

Explanation:

Data Given:

no. of moles of sodium = 2.35 x 10²¹ moles

mass of sodium = ?

Solution:

Formula used

         no. of moles = mass in grams / molar mass

To find mass rearrange the above equation:

   mass in grams = no. of moles x molar mass. . . . . . (1)

Put values in equation 1

          mass in grams = 2.35 x 10²¹ moles x 23 g/mol

          mass in grams =  5.41 x 10²² g

So,

mass of Sodium (Na) =  5.41 x 10²² g

Answer:

The bucket with 50 degrees Celsius because it is more compact energy moving around faster in a smaller space, while the water in the bathtub is colder so it is moving slower but it also has more space so the protons don't bounce off of each other or the walls as much.

Explanation:

The bucket of water at 50°C would feel warmer to the touch. However, the bathtub filled with water at 25°C contains more energy due to its larger mass.

To determine which would feel warmer to the touch, we need to consider the temperature difference between the object and our body. The bucket of water at 50°C would feel warmer because it has a higher temperature compared to our body temperature. In terms of energy, the bathtub filled with water at 25°C contains more energy because it has a larger mass.

Heat energy is given by the formula Q = mcΔT, where Q represents heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Since the bathtub contains more water and has a larger mass than the bucket, it has more energy.

Therefore, while the bucket of water would feel warmer to the touch, the bathtub contains more energy due to its larger mass.

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Answer:

21.4 ×10²³ particles

Explanation:

Given data:

Number of moles of aluminium sulfate = 3.55

Number of particles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 3.55 moles of aluminium sulfate:

3.55 mol × 6.022×10²³ particles / 1 mol

21.4 ×10²³ particles

The electron configuration for Boron (B) is given as [tex]1s^2 2s^2 2p^1[/tex] or [tex][He] 2s^2 2p^1[/tex]

Answer:

Boron (B) has an atomic number equal to 5 and is an element from Group 13 of the periodic table. It has a total of 5 electrons of which 3 are valence electrons.

The electron configuration for Boron can be written with the first two electrons in the 1s orbital. Since 1s orbital can hold only two electrons, out of the remaining three electrons; two electrons will go in the 2s orbital. The remaining one electron in the 2p orbital. Therefore the Boron electron configuration will be [tex]1s^2 2s^2 2p^1[/tex]

Since [tex]1s^2[/tex] is the electron configuration for Helium, Electron configuration for Boron can also be written as [tex][He] 2s^2 2p^1[/tex]

(Refer attached figure)

Answer:

I think the answer is D a ray of violet light

Hope it helps!

Protostars are less dense than other stars.  

Explanation:

Protostars are very young ‘stars’ made from hydrogen clouds that are beginning to coalesce and collapse under their weight. The hydrogen has not even begun fusing. Therefore, they are mainly made of hydrogen which is the lightest element in the universe.

Stars, however, have begun fusing hydrogen to other heavier elements like helium, carbon, oxygen, and iron. The elements are much heavier than hydrogen making other stars much denser than protostars.

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Answer:

16

Explanation:

FIRST AND FOREMOST, BALANCE YOUR EQUATION.

Al + S8 ➡️ Al2S3

Numbers of Al=1. ➡️ Numbers of Al = 2

Numbers of S =8. ➡️ Numbers of S. = 3

USE COEFFICIENT TO BALANCE THE EQUATION.

16Al + 3S8 ➡️ 8Al2S3

Now the Numbers of Al and S in both sides of eqn. is balanced

The Answer Is 16

Answer: 16 Al

Explanation: If we balance the chemical equation the result is this:

16 Al + 3 S8 => 8Al2S3

Sulfur both have 24 electrons in the reactant and product side

While for Al contains 16 on both sides.

To calculate the density of the cube, we first determined the cube's volume by cubing the side's length and then divided the mass by the volume, resulting in a density of 6.179 g/cm³.

To find the density of the cube, we need to use the formula:

Density = mass/volume.

The mass of the cube is given as 0.92 grams. To calculate the volume of the cube, we cube the length of one side:

Volume = side3 = 0.53 cm x 0.53 cm x 0.53 cm.

Volume = 0.148877 cm3 (rounded to six decimal places).

Now, we can calculate the density:

Density = 0.92 g / 0.148877 cm3

Density = 6.179 g/cm3 (rounded to three decimal places).

Therefore, the density of the cube is 6.179 g/cm3.

Answer:

its b

Explanation:

The mass of the salt is 8.00 grams.

To find the mass of the salt, we need to know the molar mass of NaCl. The molar mass of NaCl is calculated by adding the atomic mass of sodium (Na) to the atomic mass of chlorine (Cl). The atomic masses of Na and Cl are 22.99 grams/mole and 35.45 grams/mole, respectively. Adding these two values, we get a molar mass of 58.44 grams/mole for NaCl.

Now, we can use the given number of molecules (8.24 x 10^22) to calculate the mass of the salt. To do this, we first need to convert the number of molecules to moles by dividing it by Avogadro's number (6.02 x 10^23 molecules/mole). So, the number of moles of NaCl is 8.24 x 10^22 / 6.02 x 10^23 = 0.1368 moles.

Finally, we can calculate the mass of the salt by multiplying the number of moles (0.1368) by the molar mass of NaCl (58.44 grams/mole). The mass of the salt is therefore 0.1368 moles x 58.44 grams/mole = 8.00 grams.

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Explanation:

Mutations on DNA create genetic variation and diversity on which natural selection acts upon. Mutation can be advantageous, disadvantageous or neutral. Those mutations that confer advantage are preserved in the population while those that are DISadvantageous are weeded out. This occurs because advantageous traits that give a particular advantage to individuals in the environment, however slightest, give them an increased chance of survival and passing their genes to subsequent generations.

An example is mutation that causes sickle cell-shaped blood cells. Individuals with sickle cell blood are less likely to contract malaria. Therefore in an environment where malaria is endemic, the population will have a higher allele frequency for sickle cell alleles that populations in non-endemic areas.

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Answer:

They’re correct it is 10 seconds

Explanation:

Answer: 10 seconds

Explanation:

Answer:

Yes

Explanation:

Sulfur in its pure do not have any taste and odor but many foods rich in sulfur can have a distinct odor and taste. The foods contains sulfur in very small amounts but some of the foods which are known for rich in sulfur are onion, garlic, egg, flex seeds, walnuts, meat, red bell pepper, cheese, green vegetables etc.

The foods rich in sulfur helps in fighting skin acne and fights skin infection which makes our skin brighter because of this property of sulfur it is used in skin antiseptic creme and medicines.

The intake of the excess sulfur can cause burning sensation, diarrhea, tonsils and even can cause brain damage if taken in too excess and death of the brain cells. So, the sulfur is good for health and is a remedy for our skin if taken by the natural source of food in a healthy amount.

Answer:

He is right, sulfured food dose taste different

Answer:

Round

Explanation:

Answer: Protons = 13

Electrons= 10

Neutrons = 14

Explanation: This problem is an ion of Al which has a charge of +3

For this ion the atomic number for Al is 13 and its mass number is 27.

The atomic number indicates the number of protons which is 13. The number of electrons is changed due to loss of electrons since it was ionized. It loses 3 electrons so the total number of electrons is 13-3 = 10.

The number of neutrons can be calculated using

Atomic mass - atomic number

27- 13 = 14 neutrons

Aluminum ion (Al³⁺) has thirteen protons, thirteen protons, and ten electrons.

Aluminum ion (Al³⁺) is formed by the loss of three electrons from the neutral aluminum atom.

The neutral aluminum atom has thirteen protons, thirteen electrons, and thirteen protons.

During the formation of the Aluminum ion (Al³⁺), three electrons are removed from the valence shell of the neutral aluminum atom, leaving it with only ten electrons.

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Answer:

126.18 hr

Explanation:

Data given:

1 mL of water = 20 drops

count rate = 10 drops/s

time in hours for one gallon = ?

Solution:

First we calculate number of mL (milliliter) of water in gallon

As we know

1 gallon = 3785.4 mL

As,

1 galon consist of 3785.4 mL of water, so now we count number of drops that contain 3785.4 mL of water

As we Know 1 mL water contain 20 drops then 3785.4 mL of water contain how many drops:

Apply unity formula

                    1 mL water ≅ 20 drops

                    3785.4 mL water ≅ X drops

Do cross multiplication

                 X drops of water = 20 drops x 3785.4 mL / 1 mL

                 X drops of water = 75708 drops

So, we come to know that one gallon contain 75708 drops of water and we have to calculate the time in hour to count these drops

First we calculate time in seconds

As we Know 10 drops water count in one second then how many seconds it will take to count 75708 drops

Apply unity formula

                    1 second ≅ 10 drops

                    X second ≅ 75708 drops

Do cross multiplication

                 X second  = 1 second x 75708 drops / 10 drops

                 X second = 7570.8 second

So it take 7570.8 second to count 1 gallon water drops

Now convert seconds to hours

As,

60 seconds = 1 hr

7570.8 second  =  7570.8 / 60 = 126.18 hr

So it take 126.18 hr to count 1 gallon water drops.

Final answer:

It will take approximately 2.1 hours to count the number of drops in 1.0 gallons of water, given a counting rate of 10 drops per second.

Explanation:

To determine how long it will take to count the number of drops in 1.0 gallons of water, we need to establish some conversions. First, 1 gallon is equivalent to 3.785 liters, and 1 milliliter is equivalent to 20 drops of water. Given that the counting rate is 10 drops per second, we calculate the time needed as follows:

Convert gallons to milliliters: 1.0 gal = 3.785 L = 3,785 mL

Calculate the total drops of water in the volume: 3,785 mL × 20 drops/mL = 75,700 drops

Determine the time to count the drops: 75,700 drops ÷ 10 drops/s = 7,570 seconds

Convert seconds to hours: 7,570 s ÷ 3,600 s/hour = 2.1025 hours

Therefore, it will take approximately 2.1 hours to count the number of drops in 1.0 gallons of water at a rate of 10 drops per second.

Answer: option D. 3:1

Explanation:

the answer to this question is C 2:1

Answers:

a. Moles of oxygen formed: 0.670 mol

b. Moles of water formed: 1.34 mol

c. Mass of water formed: 24.1 g

d. Mass of oxygen formed: 21.4 g

Explanation:

Dihdyrogen dioxide is the chemical name for a compound made of two hydrogen atoms and two oxide atoms, i.e. H₂O₂, which is also known as hydrogen peroxide or oxygenated water.

The decomposition reaction of dihydrogen dioxide into water and oxygen gas is represented by the balanced chemical equation:

[tex]2H_2O_2(l)\rightarrow 2H_2O(l)+O_2(g)[/tex]

The mole ratios derived from that balanced chemical equation are:

a. Moles of oxygen formed

[tex]2\text{ mol }H_2O_2/1\text{ mol }O_2=1.34\text{ mol }H_2O_2/x[/tex]

When you solve for x, you get:

b. Moles of water formed

[tex]2\text{ mol }H_2O_2/2\text{ mol }H_2O=1.34\text{ mol }H_2O_2/x[/tex]

When you solve for x, you get:

c. Mass of water formed

Using the number of moles of water calculated in the part b., you calculate the mass of water formed, in grams, using the molar mass of water:

       ⇒ mass in grams = number of moles × molar mass

       ⇒ mass in grams = 1.34 mol × 18.015 g/mol = 24.1 g

d. Mass of oxygen formed

Using the number of moles of oxygen determined in the part a., you calculate the mass in grams using the molar mass of O₂.

Answer: 100kPa

Explanation:

P1 = 3.00 x 10² kPa , P2 =?

T1 = 30°C = 30 +273 = 303k

T2 = —172°C = —172 + 273 = 101k

P1/T1 = P2/T2

3 x 10² / 303 = P2 / 101

P2 = (3 x 10² / 303) x 101

P2 = 100kPa

Final answer:

The final pressure in the container when the temperature is lowered to -172°C is calculated using Gay-Lussac's Law. By converting temperatures to kelvin and applying the formula P2 = (P1 x T2) / T1, we find the final pressure to be approximately 99.5 kPa.

Explanation:

The question is related to the behavior of gases under changes in temperature, which can be described by the Gas Laws, specifically the Gay-Lussac's Law. According to Gay-Lussac's Law, the pressure of a gas is directly proportional to its temperature in kelvins, provided that the volume and amount of gas remain constant. The law can be expressed as P1/T1 = P2/T2, where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

To solve the problem, first convert the initial and final temperatures from Celsius to Kelvin:

Now using Gay-Lussac's Law:

The formula P2 = (P1 x T2) / T1 will give us the final pressure P2.

Substituting the known values:

P2 = (3.00 x 10² kPa x 101.15 K) / 303.15 K =approx 99.5 kPa

Therefore, the final pressure in the container will be approximately 99.5 kPa when the temperature is lowered to -172°C.

Answer: The new penny is not pure copper

Explanation:

Density [tex]\rho[/tex] is defined as a relation between the mass [tex]m[/tex] and the volume [tex]V[/tex]:

[tex]\rho=\frac{m}{V}[/tex]

Now, we are told the density of pure copper is:

[tex]\rho_{copper}=8.96 g/cm^{3}[/tex]

And we are given the mass and volume of the new penny, with which we can calculate its density:

[tex]\rho_{penny}=\frac{m_{penny}}{V_{penny}}=\frac{2.49 g}{0.349 cm^{3}} [/tex]

[tex]\rho_{penny}=7.13 g/cm^{3}[/tex] As we can see the density of this penny is not equal to the density of pure copper, hence the new penny is not pure copper.

Answer:

The pressure of the gas will  "increases by a factor of four."

Explanation:

The absolute zero in other words called as the absolute temperature. Whereas the absolute zero is the least possible temperature. In which nothing will remain cold and no heat can be released or present in the substance. When it is described in the figure it will be, –273.15 degrees Celsius on the Celsius scale. and  0 K on the Kelvin scale. This absolute temperature concept has been raised from the third law of the thermodynamics.

Answer:

the answer to this question if dealing with biology should be;

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation:

this is due to the way scientists tend to write traits. this is the likely result of the box method of doing so

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation: This is due to the way scientists tend to write traits. this is the likely result of the box method.