Answer: C. q < 0
Explanation: sorry if I'm wrong
Which compound has the strongest hydrogen bonding at STP?
1. H2O 3. H2Se
2. H2S 4. H2Te
All matter has both physical and chemical properties.
True or False
Answer:
F
Explanation:
what do you understand by valency electron and valency shell?
Answer:
total no. of electron present in Valency shell is called valency electron ___________________valency shell is that in which last electron is presentCan gravity be considered a force?
Answer: Gravity is considered a universal force because it acts between any two masses anywhere in the universe.
Answer:
Gravity (from Latin gravitas 'weight'[1]), or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light[2]—are brought toward (or gravitate toward) one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
what is this i need help please
Answer:
umm probly glucose and oxygen.??
Explanation:
what are three ways the plates can move
Question 1
2 pts
The area around a charged object where the object can exert a force on
other charged objects is an electric
field
charge
induction
force
Answer:
A. electric field
Explanation:
took test
Answer:
electric field
Explanation:
Which of the following is considered the first receiver for the nicotine in a smoking person?
1.left atrium
2.right atrium
3.left ventricle
4.right ventricle
Answer:
i think right artrium but not full aure
2. what is the molarity of a 300ml solution which is 25%by mass H2S04?
the solutions mass is 353.4g
Answer:
3 M
Explanation:
Molarity is calculated by dividing the moles of the solute by the liters of solution. In this problem, we are given that the mass of the solution is 353.4 g and that the mass of the solute (H2SO4) is 25% of this.
Thus, you get that the mass of the solute is 88.35 g.
Next, you must convert the mass of the solute into moles. You must use the periodic table to find the molar mass of the solute in order to do the conversion.
Thus, you get that the number of moles of solute is 0.90.
Molarity is then = 0.90 mol/.300 L = 3 M.
The molarity of a 300ml solution of mass 353.4 g which is 25%by mass H₂SO₄ is 2.94 molar.It is calculated from the number of moles of sulphuric acid.
What is molarity?Molarity is a term used to represent the concentration of a solution. Mathematically it is the ratio of the number of moles of solute to the volume of solution in liter.
The mass percent of substance is the ratio of mass of that substance to the total mass. Here, the total mass of the solution is 353.4 g and the solute acid is 25% by mass. Thus mass of the solute is :
353.4 × 25 /100 = 88.3 g.
The molar mass of sulphuric acid is 100 g/mol. Thus number of moles of solute is 88.3 g/100 g/mol = 0.88 moles.
The volume of the solution is 300 ml or 0.3 liter. Now, the molarity of the solution can be calculated as follows:
Molarity = no.of moles of solute/volume in L
= 0.88 mol / 0.3 L
= 2.94 mol/L.
Hence, the molarity of the solution is 2.94 molar.
To find more about molarity, refer the link below:
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Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules.
Which statement best describes changes to food during digestion?
A. The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.
B. The muscle contractions result in chemical changes, while the peptidase results in physical changes.
C. The muscle contractions and the action of the peptidase both result only in physical changes.
D. The muscle contractions and the action in the peptidase both result only in chemical changes.
Answer:
The answer is: A
Explanation:
The wave-like contractions are to be considered a physical change as they do not take part in the breaking-down of the food. The peptidase is a chemical change because it is used to chemically break down the food to retrieve nutrients and such.
Copper carbonate (CuCO3) reacts with hydrochloric acid (HCl) according to this equation:
CuCO3(s) + 2HCl(aq) → CuCl2(aq) + H2O(l) + CO2(g).
Which statement correctly describes the substances in this reaction?
A.
Exactly one product and two reactants are either liquid or dissolved in water.
B.
Exactly one of the reactants is in a water-based solution, but none of the products are.
C.
The reactants include both a liquid and a gas.
D.
Exactly one reactant is a solid, and exactly one product is a gas.
E.
The products include a solid, a liquid, and a gas.
Answer:
d
Explanation:
plato
Answer:
d
Explanation:
Whats the answer marking brainliest :-)
Answer:
A
Explanation:
hope this helps you have a good day
Because of this, railroads use the reaction to provide molten steel to weld steel rails together when laying track. When 23.00g of iron(III) oxide reacts with aluminum metal, how many moles of molten iron (Fe) are formed
Answer:
0.288 mole of Fe.
Explanation:
We'll begin by calculating the number of mole present in 23.00g of iron(III) oxide (Fe2O3). This can be obtained as follow:
Mass of Fe2O3 = 23 g
Molar mass of Fe2O3 = (56×2) + (16×3)
= 112 + 48
= 160 g/mol
Mole of Fe2O3 =?
Mole = mass /Molar mass
Mole of Fe2O3 = 23 / 160
Mole of Fe2O3 = 0.144 mole
Next, we shall write the balanced equation for the reaction. This is given below:
2Al + Fe2O3 —> Al2O3 + 2Fe
From the balanced equation above,
1 mole of Fe2O3 reacted to produce 2 moles of Fe.
Finally, we shall determine the number of mole of Fe produced by the reaction of 23 g (i.e 0.144 mole) of Fe2O3. This can be obtained as illustrated below:
From the balanced equation above,
1 mole of Fe2O3 reacted to produce 2 moles of Fe.
Therefore, 0.144 mole of Fe2O3 will react to produce = 0.144 × 2 = 0.288 mole of Fe.
Thus, 0.288 mole of Fe is obtained from the reaction.
A sample of 2.00 moles of oxygen at 45°C and 98.6 kPa occupies what volume?
Answer:
V = 53.83 L
Explanation:
Given data:
Number of moles = 2.00 mol
Temperature = 45°C (45+273 = 318 K)
Pressure = 98.6 KPa (98.6/101 = 0.97 atm)
Volume of gas = ?
Solution:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
0.97 atm × V = 2.00 mol × 0.0821 atm.L/mol. K × 318 K
V = 52.22 atm.L/0.97 atm
V = 53.83 L
Why do atoms become larger as you move down a group?
O The numbers of energy levels increase.
O Electron shielding increases.
O The decrease in ionization energy.
O The mass of the atom increases.
Explanation:
option C is the correct answer of this question
A sample of neon gas occupies a volume of 752 mL at
298K. What volume will the gas occupy at 320.K?
please helppppp
Answer:
815mL am 10000000% sure
What is responsible for the blue sky?
Answer:
well for me it's
Explanation:
The reflection of the seas
What is the energy required to go from a solid to a liquid called?
A. The latent heat of fusion
B. The thermal energy of a substance
C. The latent heat of vaporization
D. The specific heat capacity
Answer:
enthalpy of fusion also called heat of fusion
HELP PLSSS FASTTTTTT!!!!!!!!!!!!!!!!
Answer:
with what?
Explanation:
Special thanks to anyone who answers this...
Answer:
94.74 moles of NO₂ are produced.
Explanation:
Given data:
Volume of oxygen gas = 3714 L
Temperature = 273 K
Pressure = 1 atm
Moles of NO₂ produced = ?
Solution:
Chemical equation:
4NH₃ + 7O₂ → 4NO₂ + 6H₂O
Number of moles of oxygen:
At STP one mole of any gas occupy 22.4 L volume. Thus, 3714 L gas contain,
3714 L× 1 mol / 22.4 L
165.8 mol
now we will compare the moles of oxygen and nitrogen dioxide.
O₂ : NO₂
7 : 4
165.8 : 4/7×165.8 = 94.74 mol
Thus, 94.74 moles of NO₂ are produced.
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the CO2 molecule has which of the following characteristics
Answer:
The carbon dioxide molecule is linear and centrosymmetric at equilibrium. The carbon–oxygen bond length is 116.3 pm, noticeably shorter than the bond length of a C–O single bond and even shorter than most other C–O multiply-bonded functional groups. Since it is centrosymmetric, the molecule has no electrical dipole.
Explanation:
Answer:
The carbon dioxide molecule is linear and centrosymmetric at equilibrium. The carbon–oxygen bond length is 116.3 pm, noticeably shorter than the bond length of a C–O single bond and even shorter than most other C–O multiply-bonded functional groups. Since it is centrosymmetric, the molecule has no electrical dipole.
Carbon dioxide | CO2 | CID 280 - structure, chemical names, physical and chemical ... It is a one-carbon compound, a gas molecular entity and a carbon oxide. ... Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. ... These actions are exploited clinically in the use of hyperventilation to diminish ...
Molecular Formula: CO2
PubChem CID: 280
Molecular Weight: 44.009 g/mol
Chemical Safety: Laboratory Chemical Safety
MARKING BRAINLIEST!
plant or animal and to explain the reasoning for their conclusion. What is the correct response?
The cell is an animal cell because it has a cell membrane and no cell wall. Cell walls are unique to plant cells.
The cell is a plant cell because it has cytoplasm, which helps the plant make their own food from sunlight.
The cell is a plant cell because it has chloroplast, which helps the plant make its own food from sunlight.
The cell is an animal cell because it has chloroplast used for making useable energy.
Answer:
The cell is a plant cell because it has chloroplast, which helps the plant make its own food from sunlight.
Explanation:
Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant.
13. What is the frequency of a wave that has a wavelength of 2.73 x 10-7m?
Answer:
f = 1.09 × 10¹⁵ Hz
Explanation:
Given data:
Frequency of wave = ?
Wavelength of wave = 2.73 ×10⁻⁷ m
Solution:
Formula:
Speed of light = frequency × wavelength
speed of light = 3× 10⁸ m/s
by putting values,
3× 10⁸ m/s = f × 2.73 ×10⁻⁷ m
f = 3× 10⁸ m/s / 2.73 ×10⁻⁷ m
f = 1.09 × 10¹⁵s⁻¹
s⁻¹ = Hz
f = 1.09 × 10¹⁵ Hz
How many grams of water would require 2250 joules of heat to raise it’s temperature from 34.0 C to 100.0 C ?
Answer:
8.117grams
Explanation:
its obtained from Q=MCT where
Q-HEAT REQUIRED
C-SPECIFIC HEAT CAPACITY OF WATER
M-MASS OF WATER
T-TEMPERATURE CHANGE(100C-34C)
HELP PLEASEE I WILL GIVE BRAINLIEST
Classify each characteristic according to whether it is true for an amoeba, a clock, or both.
Answer:
Amoeba: reproduces
clock: lacks genetic material
both: has defined boundary, use energy, and have an internalized organization.
Explanation:
Amoeba is a single cell organism known as amoeboid which is a eukaryotic cell and has all the eukaryotic features such as membrane-bound organelles including the nucleus. The nucleus contains the genetic material of the amoeba cells and which is transferred to the offspring by reproduction. The cell membrane is the outer boundary of the cell use energy to perform its cellular functions.
A clock is a non-living thing that contains many small parts to make it work properly and requires energy to work. It is not a living thing so does not have genetic material. However, it has a defined boundary in it.
D
Magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide as
shown.
MgCO3 → MgO + CO2
How much magnesium carbonate is needed to make 5.0g of magnesium oxide?
А
3.5g
B 4.09
C 6.5g
D 10.59
The amount of 10.5 g magnesium carbonate is needed to make 5.0g of magnesium oxide.
So, option D is correct.
Given that, Magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide as
MgCO₃ → MgO + CO₂
Molar mass of MgCO₃ = 24 + 12 + 48 = 84 g/mole
Molar mass of MgO = 24 + 16 = 40g/mole
40 gram MgO is produced from 84 gram of MgCO₃
1 gram of MgO produced from [tex]\frac{84}{40}=2.1[/tex] gram of MgCO₃
Therefore, 5 gram of MgO produced from [tex](5*2.1=10.5gram)[/tex] of MgCO₃
Thus, option D is correct.
Learn more about molar mass here:
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YO SOMEONE ANSWER DIS ASAP I GOT 2 MINUTES
Answer:
Solids 1 and 3
Explanation:
Their melting points are almost identical and each element has a unique melting point.
0.500 L of a gas is collected at 2911 MM and 0°C. What will the volume be at STP?
Answer:
V₂ = 1.92 L
Explanation:
Given data:
Initial volume = 0.500 L
Initial pressure =2911 mmHg (2911/760 = 3.83 atm)
Initial temperature = 0 °C (0 +273 = 273 K)
Final temperature = 273 K
Final volume = ?
Final pressure = 1 atm
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
by putting values,
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 3.83 atm × 0.500 L × 273 K / 273 K × 1 atm
V₂ = 522.795 atm .L. K / 273 K.atm
V₂ = 1.92 L
Why the graph isn't just a single sloped straight line.
Answer:
the equation could have mulitplication and square roots which may change the function of the line
