Answer:
1. Blood sugar will decrease because glucagon increases blood sugar when it falls too low.
Acceleration usually has the symbol a. It is a vector. What is the correct way
to write the symbol to show that it is a vector?
A. â
B. a
C. a
D. ā
Answer: D
The correct way of writing a vector is to put a bar (-) on it.
Acceleration usually has the symbol a. It is a vector. The correct way
to write the symbol to show that it is a vector is â. Option A is correct.
Acceleration refer to the rate of change of velocity with time. That is velocity divided by time.
Uniformly accelerated motion refer to the movement of velocity in a straight line and when the amount increase in velocity is in equal interval with amount increase in time.
Vector quantity is the quantity that have both magnitude and direction. Example include acceleration.
Scalar quantity refer to quantity with magnitude and no direction.
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which noble gas has the highest first ionization energy
Answer:
Helium has the highest First Ionization Energy in the Noble Gases group. Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms.
Final answer:
Helium (He) has the highest first ionization energy among the noble gases, attributed to its stable valence shell configuration and minimal electron shielding effect.
Explanation:
The noble gas with the highest first ionization energy is Helium (He). This can be understood considering the general trend that ionization energy increases as one moves across a period from left to right in the periodic table. Noble gases, situated at the far right of the periodic table, consequently have the highest ionization energies within their respective periods due to their stable electronic configurations, with filled valence shells.
Among the noble gases, Helium, being the lightest and having the least number of electron shells, demonstrates the least shielding effect. This results in its valence electrons being more strongly attracted to the nucleus compared to other noble gases, thereby requiring more energy to remove an electron, i.e., higher ionization energy. In contrast, heavier noble gases like Xenon (Xe) and Radon (Rn) exhibit relatively lower first ionization energies due to increased electron shielding from inner electrons.
What is the velocity of a rocket that goes 700 km north in 25 second
Answer: 28000m/s
Explanation:
Displacement = 700 km due north = 700000m
Time = 25secs
Velocity =?
Velocity = Displacement / Time
V = 700000 / 25 = 28000m/s
What best describes the goals of scientific investigation and technological development?
Both scientific investigation and technological design aim to solve problems by making more cost
products.
Both scientific investigation and technological design aim to conduct experiments to uncover new i
results.
Scientific investigation aims to design products that can make use of new information, whereas tec
aims to conduct experiments to improve affordability and availability.
Scientific investigation aims to design and implement an experiment to learn new information, where
development aims to design a product to solve a problem.
Answer:
Scientific investigation aims to design and implement an experiment to learn new information, where
development aims to design a product to solve a problem.
Explanation:
Answer:
D
Explanation:
Scientific investigation aims to design and implement an experiment to learn new information, whereas technological development aims to design a product to solve a problem.
What is the oh- given the value of h30+=(9.61x10^-2) M?
Answer:
OH⁻ = 1.05×10⁻¹³ M
Explanation:
Given data;
H₃O⁺ = 9.61×10⁻² M
OH⁻ = ?
Solution:
First of all we will calculate the pH.
pH = -log [H⁺]
pH = -log [H₃O⁺]
Because pH is also the hydronium ion concentration.
pH = -log [ 9.61×10⁻²]
pH = 1.02
It is known that,
pH + pOH = 14
1.02 + pOH = 14
pOH = 14 - 1.02
pOH = 12.98
Concentration of OH⁻.
pOH = -log [OH⁻]
12.98 = -log [OH⁻]
OH⁻ = 10∧-12.98
OH⁻ = 1.05×10⁻¹³ M
Visible light that reaches the Earth from the Sun is known as white light. Which of the following statements about white light is true?
A.
White light is made up of only one color.
B.
White light falls within the microwave portion of the electromagnetic spectrum.
C.
White light is made up of a spectrum of many different colors.
D.
White light is made up mostly of ultraviolet and infrared light
PLEASEEEE PLEASEEE HELPPPPP
Answer:
C, hope this helps you!
The statement about white light which is true is: C. White light is made up of a spectrum of many different colors.
Light energy can be defined as an electromagnetic wave that does not require a medium of propagation, for it to travel through a vacuum (space), where no particles exist.
Also, light energy is mainly different from both sound and heat energy because light energy can exist independent of matter.
A white light can be defined as any form of visible light reaching planet Earth from the Sun. For example, the visible light energy from distant galaxy of stars and the Sun.
Generally, white light is a visible light that comprises a spectrum of several different colors such as red, orange, yellow, green, blue and violet.
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in which atmosphere layer does 80% of the gas in the atmosphere reside
Answer:troposphere
Explanation:The troposphere is the layer that holds 80 percent of the total gas in the atmosphere.
Which best explains the purpose of a worker slowdown?
prevent the employer from hiring strikebreakers
demonstrate the importance of worker-employer cooperation
make sure that the employer doesn't make any profit
pressure the employer to increase the minimum wage
Answer: B) Demonstrate the importance of worker-employer cooperation.
Explanation: Slow down or strike is a demenstration to the employer just how important the workers are to the corp and work place. Nothing can function or run properly without them.
If this is the best answer please mark brainilest. Hope this helps, have a great day!The statement that explains the purpose of a worker slowdown.
B) Demonstrate the importance of worker-employer cooperation.
What is Slow down?A slow down might be utilized as either an introduction or an option in contrast to a strike, as it is viewed as less problematic as well as safer and exorbitant for laborers and their association. Striking laborers typically go neglected and risk being supplanted, so a slow down is viewed as a method for coming down on administration while keeping away from these results.
Thus, correct option is B.
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Which best explains why the game of economics does not have a single goal?
Most people do not know what economics is about.
• Some economic goals are not compatible with each other.
• Different people want different things out of life.
Economics is a game without winners or losers.
Answer: Different people want different things out of life
Your Welcome ^_^
A light wave traveling through an unknown medium strikes the boundary with
water at a 45° angle and then refracts toward the boundary. What could the
unknown medium be?
O
A. Glass
O
B. Air
O
C. Water
O
D. Diamond
Answer:
hello im breanna and i believe your answer is b.
Explanation:
Chemistry
How many water molecules are in 1.9 moles of water?
Use 6.022 X 1023 for Avogadro's Number!
Use "e-notation" when answering. 6.022 X 1023 would be entered as 6.022e23
Answer:
11.442E23molecules
Explanation:
Given data:
Number of moles of water = 1.9 mol
Number of molecules of water = ?
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
In 1.9 moles:
1.9 mol × 6.022 × 10²³ molecules / 1 mol
11.442 × 10²³ molecules
In e notation:
11.442E23 molecules
What is true of greenhouse gases
Let us explain about green house gases
Explanation:
Green house effect
It can be explained as :
The sun emit radiations that consist of infra red rays , ultra violet rays and visible light .The infra red rays (responsible for heating ) when come from sun , it travels through atmosphere and reaches earth surface .On striking the earth surface , it gets reflected and reflected infra red ray has greater wavelength .Then this reflected rays moves back through atmosphere .On doing so , they encounter certain gas molecules like carbon dioxide , methane etc .This gases absorb these rays and do not let them to escape through them .As a result, they get trapped .As we have already mention that they cause heating effect , due to this property they raise the temperature of atmosphere leading global warming .The molecular weight of calcium carbonate, CaCO3, is 100.09 3.
mol
How many moles of calcium carbonate are in 63.8 g of calcium carbonate?
Express the answer using 3 significant figures.
Answer:
Number of Moles = Reacting mass / Molecular mass
= 63.8 / 100.09
= 0.637g
Hence, the moles of calcium carbonate in 63.8 g of calcium carbonate is 0.637g
Explanation:
The number of moles of a compound is the ratio of weight given to the molar mass. One mole calcium carbonate is 100.09 g/mol. Then, the number of moles in 63.8 g of calcium carbonate is 0.638 moles.
What is one mole of a substance ?One mole of a substance is its amount containing 6.02 × 10²³ number of its atoms. This number is called Avogadro number. Hence, one mole of any element contains Avogadro number of atoms. The mass of one mole of an element is called atomic mass.
Similarly one mole of any compound contains Avogadro number of molecules. The mass of one mole of the compound is called its molar mass.
Molar mass of calcium carbonate = 100.9 g/mol
given mass = 63.8 g
then, number of moles = 63.8 /100.9 g = 0.693 moles.
Therefore, the number of moles of 63.8 g of calcium carbonate is 0.693 moles.
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Give an example of a solution that can be seperated by simple distilation.
Answer: Evaporation of salt water
Explanation: During the process of evaporating salt water which involves simple distillation, pure water is separated with salt molecules.
When heated water evaporates from the solution since it is less dense. When condensed it becomes pure water and salt is left out since it is more denser.
Why is the outermost shell of an atom significant?
Answer:
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons
Explanation:
What are the 4 results of cell division?
Answer:
Metaphase
prophase
anaphase
telophase
Explanation:
A metal cylinder is placed in a graduated cylinder which has been filled with water to the 70.0 mL mark. The water level rises to the 78.0 mL mark. What is the volume of the metal cylinder?
Answer:
Explanation V= New mL displaced water - original old water that was already in the grad. cylinder basically 8.0 mL:
The volume of the metal cylinder is found by calculating the difference between the initial and final water levels in a graduated cylinder, which is 8.0 mL in this instance.
Explanation:The volume of the metal cylinder can be determined using the water displacement method, where the initial volume of water in the graduated cylinder is recorded, and then the volume after placing the metal cylinder inside is measured. The difference between these two readings gives the volume of the metal cylinder. In this case, the initial volume is 70.0 mL, and after the cylinder is placed, the new volume is 78.0 mL.
The rise in water level, from 70.0 mL to 78.0 mL, indicates that the volume of the metal cylinder is 8.0 mL, since the volume of water displaced is equal to the volume of the submerged part of the cylinder.
It's important to consider factors such as the meniscus and potential distortions of the graduated cylinder's calibration when estimating and reading the volumes to ensure accuracy.
The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how
has the pressure of the gas changed?
It has increased to two times its original value.
It has increased to four times its original value
It has decreased to one-half its original value.
It has stayed the same.
Answer:
Option D is correct: It has stayed the same.
Explanation:
Data Given:
fixed amount of gas
volume = 2x
Absolute temperature = 2x
effect on Pressure according to ideal gas law.
Solution:
To know the effect we will made calculation by ideal gas law
As,
we know that pressure for ideal gas law = 1 atm
Now we look for this change in pressure from 1 atm
new pressure can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for Pressure
P = nRT / V . . . . . . . . . (1)
where
P = pressure
V = Volume
T= Temperature
n = Number of moles
R = ideal gas constant
Standard values
T = 273 K and its double will be
T= 2 (273 K) = 546 KFixed amount of gas
n = 1 moleR = 0.08206 L.atm / mol. K
V = 22.42 L/mol and its double will be
V = 2(22.42 L/mol) = 44.84 L/mol
Now put the value in formula (1) to calculate Pressure
P = 1 x 546 K x 0.08206 L.atm/mol.K / 44.84 L/mol
P = 44.772 L.atm/mol / 44.84 L/mol
P = 0.9996 atm
So,
P ≅ 1 atm
It means there is no change in the pressure by double amount of temperature and volume.
Option D is correct. It has stayed the same.
Answer:
D
Explanation:
im taking the final rn too
How do you balance a chemical reaction?
Answer:
write down the number of atoms in each element, which is listed in the subscript next to each atom. Then, add coefficients to the atoms on each side of the equation to balance them with the same atoms on the other side.
Explanation:
Final answer:
To balance a chemical equation, write the correct formulas, count the atoms of each element, adjust coefficients to balance the atoms, use polyatomic ions as units, eliminate fractional coefficients for whole numbers, and check that all elements are balanced.
Explanation:
To balance a chemical reaction, one must ensure that the number of atoms for each element is equal on both sides of the equation. This is key to upholding the law of conservation of mass. The following steps are a simplified guide:
Write the skeleton equation with the correct formulas for reactants and products.
Count the number of atoms of each element in the reactants and in the products.
If the equation is not balanced, adjust the coefficients before the formulas, not the subscripts within them, to balance the atoms of each element.
Balance polyatomic ions as a unit if they appear unchanged on both sides of the equation.
Use fractional coefficients if necessary, and then multiply the entire equation to eliminate fractions and have whole number coefficients.
Perform a final check to ensure that all elements are balanced.
Throughout this process, one may use a trial-and-error approach to fine-tune the balancing, adjusting coefficients as needed until the number of atoms for each element is the same on both sides of the equation.
2zns(s)+3o2(g)—>2zno(s)+2so2(g)
This is an example of displacement reaction
Explanation:
The chemical reaction in which the one element replaces the other element in a compound is called a displacement reaction. This reaction is also called a replacement reaction.AB + C -----> AC +B
2ZnS + 3O2 -----> 2ZnO + 2SO2
This happens when A is more reactive than B and gives a stable product. Here the zinc sulfide compound reacts with the oxygen element to the stable product of zinc oxide and sulfur dioxide.In short, the more reactive element displaces the less reactive element is called a displacement reaction.How many grams of water are produced from the reaction of 1.26 mol of oxygen according to this equation?
2h2(g)+o2(g)=2h2o(g)
Answer:
45.4 g
Explanation:
Data given:
mole of oxygen = 1.26 mol
mass of water = ?
Reaction Given:
2H₂ (g) + O₂(g) --------> 2H₂O (g)
Solution:
To solve this problem we look for mole mole ratio oxygen to water we look for the chemical reaction
2H₂ (g) + O₂(g) ----------> 2H₂O (g)
1 mole 2 mol
So,
It is clear from the reaction that 1 mole oxygen gives 2 mole water then how many mole of water will produce by 1.26 moles of oxygen.
So apply unity formula
2 moles H₂O ≅ 1 mole O₂
X moles H₂O ≅ 1.26 mole O₂
Do cross multiplication
X moles H₂O = 2 mol x 1.26 mole / 1 mole
X moles H₂O ≅ 2.52 mol
So,
1.26 mole of oxygen produce 2.52 mole of water.
Now convert moles of water to mass
Formula will be used
mass in grams = no. of moles x molar mass
molar mass of water (H₂O)
molar mass of H₂O = 2(1) + 16
molar mass of H₂O = 2 + 16 = 18 g/mol
put value in above equation:
mass in grams = 2.52 mole x 18 g/mol
mass in grams = 45.4 g
So,
1.26 moles oxygen produce 45.4 g water
A liquid in lab has a density of 1.24g/cm3. What is the mass in grams of 254mL of the liquid?
Answer:
Mass= 314.96 grams
Explanation:
The density of the substance is defined as mass per unit volume of it.
The formula is :
[tex]density=\frac{mass}{Volume}[/tex]
Unit conversion:
1 liter = 1000 ml
[tex]1dm^{3}=1Liter[/tex]
So
[tex]1dm^{3}=1000ml[/tex]....(1)
[tex]1dm^{3} = (10cm)^{3}[/tex]
[tex]1dm^{3}=1000cm^{3}[/tex]
Replace The dm3 by cm3 in (1)
[tex]1000cm^{3}=1000mL[/tex]
[tex]1cm^{3}=1mL[/tex]
Volume = 254 mL = 254 cm3
Calculation of mass
[tex]density=\frac{mass}{Volume}[/tex]
[tex]1.24=\frac{mass}{254cm^{3}}[/tex]
[tex]mass=1.24\times 254[/tex]
Mass= 314.96 grams(or 315 grams)
Note: Always makes same units before solving the question. You can not determine the mass if Volume is in mL and Density is in g/cm3. Change mL into cm3 first
The mass of 254 mL of the liquid is [tex]\( 314.96 \)[/tex] grams.
To find the mass of 254 mL of liquid with a density of [tex]1.24 g/cm³[/tex], we can use the formula.
[tex]\[ \text{Mass} = \text{Density} \times \text{Volume} \][/tex]
Given.
- Density = [tex]1.24 g/cm³[/tex]
- Volume = 254 mL
Convert the volume from milliliters mL to cubic centimeters cm³ because 1 mL = 1 cm³.
[tex]\[ 254 \text{ mL} = 254 \text{ cm³} \][/tex]
Now, plug in the values into the formula.
[tex]\[ \text{Mass} = 1.24 \text{ g/cm³} \times 254 \text{ cm³} \][/tex]
Calculate the mass.
[tex]\[ \text{Mass} = 1.24 \times 254 \][/tex]
[tex]\[ \text{Mass} = 314.96 \][/tex].
6.755 mol Pb(SO4)2
How many atoms
Answer: 4.07x 10²⁴ atoms Pb( SO4)2
Explanation: Solution:
6.755 moles Pb(SO4)2 x 6.022x10²³ atoms Pb(SO4)2 / 1 mole Pb(SO4)2
= 4.07x10²⁴ atoms Pb(SO4)2
rank from the greatest to the least 1.43*10^6, 5.17*10^2, 2.34*10^5, 3.25*10^4, 4.56*10^3
Answer:
1.43×10⁶ > 2.34×10⁵> 3.25×10⁴>4.56×10³> 5.17×10²
Explanation:
First of all we will write these values in simple notation.
1) 1.43×10⁶
1.43×1000000
1430000
2) 5.17×10²
5.17×100
517
3) 2.34×10⁵
2.34×100000
234000
4) 3.25×10⁴
3.25×10000
32500
5) 4.56×10³
4.56×1000
4560
Rank from greatest to least.
1.43×10⁶ > 2.34×10⁵> 3.25×10⁴>4.56×10³> 5.17×10²
What is the mass of 5.43x1045 molecules of Beo
Answer:
2.255 x 10²³ g
Explanation:
Data Given:
no. of molecules of BeO = 5.43 x 10⁴⁵ molecules
mass of BeO = ?
Solution:
first we will find no. of moles
Formula used
no. of moles = no. of molecules / Avogadro's number
Where
Avogadro's number = 6.022 x 10²³
Put values in above equation
no. of moles = 5.43 x 10⁴⁵ molecules / 6.022 x 10²³ (molecules/mol)
no. of moles = 9.02 x 10²¹ mol
So,
There are 9.02 x 10²¹ moles of BeO of 5.43x10⁴⁵
Now we will find the mass
For this formula will be used
No. of moles = Mass in grams/ molar mass
Rearrange the above equation
mass in grams = no. of moles x molar mass . . . . . (1)
molar mass of BeO = 9 + 16 = 25 g/mol
Put values in equation 1
mass in grams = 9.02 x 10²¹ moles x 25 g/mol
mass in grams = 2.255 x 10²³ g
So,
Mass of 5.43 x 10⁴⁵ molecules of BeO = 2.255 x 10²³ g
The mass of 5.43x10^45 molecules of BeO can be calculated using the atomic masses provided in Appendix A.
Explanation:The mass of 5.43x10^45 molecules of BeO can be calculated using the atomic masses provided in Appendix A. The atomic mass of BeO is given by the formula BE = {[2m(^1H) + 2mn] - m(ª X)}c². We can substitute the atomic masses of ^1H (1.007825 u) and mn (1.008665 u) into the formula to calculate the binding energy (BE). By rearranging the formula, we can solve for the mass of 5.43x10^45 molecules of BeO.
Will make Brainliest
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
Nitrogen (N)
Sulfur (S)
Arsenic (As)
Silicon (Si)
Answer:
Arsenic (As)
Explanation:
Phosphorus is present in the group fifteen. It is belongs to the nitrogen family.
This group consist of Nitrogen, Phosphorus, Arsenic, Antimony and Bismuth.
As we move down the group the atomic number increased so in given list of elements Arsenic is present after the phosphorus it means its atomic number if greater than the phosphorus. The elements present in the same group having similar properties.
Thus nitrogen and arsenic having properties similar to the phosphorus but as it is mentioned that atomic number must be greater than the phosphorous so it will not nitrogen because the atomic number if nitrogen is 7 and that of phosphorus is 15 and Arsenic is 33.
While sulfur and silicon are belongs to other groups that's why their properties are not similar to the phosphorus.
Sulfur is present in group 18 while silicon is present in group 14.
Answer:
Arsenic
Explanation:
According to the periodic table, how many elements are a liquid at room tempreture
If an atom gains an electron, what overall charge will it have?
Answer:
The atom will have a negative charge.
Explanation:
Electrons are subatomic particles with a negative charge, protons are subatomic particles with a negative charge, and neutrons have no charge. When a neutral atom's balance is disrupted by an extra electron, the atom becomes negatively charged.
Answer:
it will have a negative charge
Explanation:
Categorize each compound as exhibiting ionic bonding or covalent bonding.
2. Lif
3. Cl2
4. NH3
5. CaCl2
6. NaOH
7. Feo
8. NO2
9. H2O
a. ionic bonding
a. ionic bonding
a. ionic bonding
a. ionic bonding
a. ionic bonding
a. ionic bonding
a. ionic bonding
a. ionic bonding
b. covalent bonding
b. covalent bonding
b. covalent bonding
b. covalent bonding
b. covalent bonding
b. covalent bonding
b. covalent bonding
b. covalent bonding
C
Answer:
Explanation:
ggg
From the given compounds, the compounds having ionic bonding are LiF, CaCl₂, NaOH, FeO and the compounds having covalent bonding are Cl₂, NH₃, NO₂ and H₂O.
What are Ionic and Covalent bonding?Ionic bonding is a type of chemical bonding which involves a transfer of electrons from one atom or molecule to another.
Ionic bonding is between a metal and a non metal.
A covalent bond indicates the sharing of electrons between atoms. Compounds that contain carbon (also called organic compounds) commonly exhibit this type of chemical bonding.
Covalent bonding is usually between two non metals.
Therefore, From the given compounds, the compounds having ionic bonding are LiF, CaCl₂, NaOH, FeO and the compounds having covalent bonding are Cl₂, NH₃, NO₂ and H₂O.
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2
How
12.6
Sn + 2 HF - Snf a + H₂
many moles of tin (11) Fluoride will be produced
grams of hydrogen fluoride react?
if
Answer:
12.6 gram of HF will produced 0.315 moles of SnF₂
Explanation:
Given data:
Mass of HF = 12.6 g
Moles of Tin fluoride produced = ?
Solution:
Chemical equation:
Sn + 2HF → SnF₂ + H₂
Number of moles of HF:
Number of moles = mass/ molar mass
Number of moles = 12.6 g/20.01 g/mol
Number of moles = 0.63 mol
Now we will compare the moles of HF with SnF₂.
HF : SnF₂
2 : 1
0.63 : 1/2×0.63 = 0.315 mol
So 12.6 gram of HF will produced 0.315 moles of SnF₂.