Answer:
pH = - log(0.000765)
= -(-3.11)
= 3.1
so the solution is basic
rest you can check values using calculator
why it is dangerous for people to continue to travel into space?
Answer:
The environment of space is lethal without appropriate protection: the greatest threat in the vacuum of space derives from the lack of oxygen and pressure, although temperature and radiation also pose risks. The effects of space exposure can result in ebullism, hypoxia, hypocapnia, and decompression sickness.
Explanation:
hope that helps love!
Explanation:
This is very dangerous because if something goes wrong while you are in space theres a 50 percenr chance you will die. As of 2020, 19 lives have been lost while in space travel.
PLZ HURRY
7. What is the measurement 1042 L rounded off to two significant digits?
A 1.0 × 103 L
B 1050 L
C 1040 L
D 1.1 x 103 L
The value 1042 L rounded to 2 significant digits is 1000 = 1.0 × 10³ L
To round to 2 significant digits :
Write out the first two digits from the left : 10The next digit after the second is rounded to 1 and added to the 2nd digit if it is greater than or equal to 5 else it is rounded to 0 Since, the third digit is 4 ; we round to to 0 ; including the other succeeding digits ; Hence, we have 10001000 could be written in scientific notation as :
1000 = 10 × 10 × 10 = 1 × 10³Therefore, 1042 = 1 × 10³ (2 significant digits)
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In hamsters, being Brown (B) is dominant to being tan (b). Two Brown hamsters produce 3 brown offspring and 1 tan offspring. What MUST be the GENOTYPES of the parents?
Answer:
Bb and Bb
Explanation:
This will give you the desired results of one homogeneous BB (brown), two heterogeneous Bb (brown), and one homogeneous bb (tan).
4. What is the specific heat of iron, if it requires 1050 J of heat energy to raise the temperature of
220,0 g of iron from 10.0.C to 20.4.C?
Answer:
0.4589J/g°C
Explanation:
Heat energy = 1050J
Mass of iron = 220.0g
Initial temperature (T1) = 10°C
Final temperature (T2) = 20.4°C
Heat energy = mc∇T
Q = mc∇T
Q = heat energy
M = mass of the substance
C = specific heat capacity of the substance
∇T = change in temperature = T2 - T1
Q = m×c×(T2 - T1)
1050 = 220 × c ×(20.4 - 10)
1050 = 220c × (10.4)
1050 = 2288c
c = 1050 / 2288
C = 0.4589J/g°C
The specific heat capacity of iron is 0.4589J/g°C
Answer:
0.4589 J g^-1 K^-1 IS THE SPECIFIC HEAT OF IRON.
Explanation:
Specific heat of iron can be calculated using the heat of reaction formulae
Heat = mass * specific heat * ( T2-T1)
H = m c (T2-T1)
c = H / m * (T2-T1)
H = 1050 J
m = 220.0 g
T2 = 20.4 ° C = 20.4 + 273 = 293.4 K
T1 = 10.0 °C = 10 + 273 K = 283 K
so therefore:
c = 1050 / 220 * ( 293.4 - 283) K
c = 1050 / 220 * 10.4
c = 1050 / 2288
c = 0.4589 J g^-1 K^-1
The specific heat capacity of iron is 0.4589 J g^-1 K^-1
Why cant we just put in subscripts?
Answer:
A subscript is a character, usually a letter or number, that's printed slightly below and to the side of another character. Subscripts are commonly used in chemical formulas. ... It's closely related to superscript, when a letter or number is printed above another character.
what is one thing that would make evidence from an experiment more reliable? A if there was no comparison group B if there was a small sample C if the source of the information was an expert D it is not D i tried D already
Answer:
Explanation:
When a scientist repeats an experiment with a different group of people or a different batch of the same chemicals and gets very similar results then those results are said to be reliable. Reliability is measured by a percentage – if you get exactly the same results every time then they are 100% reliable.
Using m1v1=m2v2,a 0.5 liters of 12 Molarity solution of NaCl was added to a 2.0 liters of water,find out the final molarity of this 2.5 liter solution
Answer:
2.4 M
Explanation:
The dilution formula, M1V1 = M2V2, states that the initial molarity times the initial volume equals the final molarity times the final volume. Plug in the values and solve for M2:
12 M * 0.5 L = M2 * 2.5 L
6 = M2 * 2.5 L
M2 * 2.5 L = 6
M2 = 6 / 2.5 = 2.4 M
Which changes occur when Pt2+ is reduced? A) The Pt2+ gains electrons and its oxidation number increases. B) The Pt2+ gains electrons and its oxidation number decreases. C) The Pt2+ loses electrons and its oxidation number increases. D) The Pt2+ loses electrons and its oxidation number decreases.
Answer:
C
Explanation:
In peas, having wrinkled pods (W) is dominant to having smooth pods (w). A heterozygous pea plant is crossed with a pea plant that has smooth pods. Create a punnett square (you do not have to include the actual square in your answer). What are the genotypes and phenotypes of the offspring (include numbers).
Answer:
Genotype: Ww, Ww, ww, ww
Phenotype: heterzygous wrinkled pods, heterzygous wrinkled pods, homozygous smooth pods, homozygous smooth pods
Explanation:
You have to cross Ww with ww and you will get the genotypes and phenotypes above.
How many moles of H+ ions are needed to neutralized 3 Liters of 8M
NaOH?*
Answer:
Answer:
0.027 mole of NaOH.
Explanation:
We'll begin by obtaining the number of mole H2SeO4 in 45mL of 0.30M H2SeO4
This is illustrated below:
Molarity of H2SeO4 = 0.3M
Volume of solution = 45mL = 45/1000 = 0.045L
Mole of H2SeO4 =...?
Mole = Molarity x Volume
Mole of H2SeO4 = 0.3 x 0.045
Mole of H2SeO4 = 0.0135 mole
Next, the balanced equation for the reaction. This is given below:
H2SeO4 + 2NaOH –> Na2SeO4 + 2H2O
From the balanced equation above,
1 mole of H2SeO4 required 2 moles of NaOH.
Therefore, 0.0135 mole of H2SeO4 will require = 0.0135 x 2 = 0.027 mole of NaOH.
Therefore, 0.027 mole of NaOH is needed for the reaction.
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Explanation:
Answer: 0.027 mole of NaOH.
Explanation:
We'll begin by obtaining the number of mole H2SeO4 in 45mL of 0.30M H2SeO4
This is illustrated below:
Molarity of H2SeO4 = 0.3M
Volume of solution = 45mL = 45/1000 = 0.045L
Mole of H2SeO4 =...?
Mole = Molarity x Volume
Mole of H2SeO4 = 0.3 x 0.045
Mole of H2SeO4 = 0.0135 mole
Next, the balanced equation for the reaction. This is given below:
H2SeO4 + 2NaOH –> Na2SeO4 + 2H2O
From the balanced equation above,
1 mole of H2SeO4 required 2 moles of NaOH.
Therefore, 0.0135 mole of H2SeO4 will require = 0.0135 x 2 = 0.027 mole of NaOH.
Therefore, 0.027 mole of NaOH is needed for the reaction.
Explanation:
Photosynthesis occurs in the ____________and cellular respiration occurs in the ___________.
Group of answer choices
Explanation:
Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria
Answer:
Chloroplast, mitochondria
Explanation:
Photosynthesis is a process that plants, algae, and some bacteria use to make their own food. They take light energy, carbon dioxide and water and produce glucose and oxygen. This process takes place in the chloroplasts.
Animals and plants both use a process called cellular respiration. This process takes glucose and oxygen, and creates ATP, carbon dioxide and water. Animals and plants use ATP to move, grow, and carry out cellular functions. This process takes place in the mitochondria.
Someone help
Please
Answer:
what is the topic
Explanation:
Which of the following are likely to form an ionic bond?
A. Carbon and hydrogen
B. Carbon and sulfur
C. Magnesium and sulfur
D. Nitrogen and oxygen
Answer:
B. Carbon and sulfur
Explanation:
Which of the following describes an object in static equilibrium?
A. A gorilla jumps straight into the air.
B.Asquid moves at a velocity of 10 m/s straight down.
C.A car drives in a circle at a constant speed of 8 m/s .
D.An elephant stands in one place without moving .
Answer:
D
Explanation:
An elephant standing in one place without moving is in static equilibrium. Therefore, option D is correct.
What is static equilibrium?Static equilibrium can be described as the sum of the exerting torques and forces on each part of the body that happens to be null.
In the static equilibrium of a body whose parts are in a state of rest. The essential condition for this type of equilibrium is that a body is not showing any form of movement.
In translational equilibrium, a body is not moving from one point to another while in rotational equilibrium is not spinning around a point. Translational equilibrium requires the sum of every outside force to be zero. Torque can be defined as a quantity that exerts the rotational movement of an object.
If two forces are acting on a body that is in the state of static equilibrium, where the total sum of forces is zero. Therefore, for the elephant standing in one place without moving there are only two forces i.e. the weight of the elephant and the normal force to balance it. Therefore, it describes in static equilibrium.
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Why is salt added to hot chicken soups during cooking besides giving the chicken soups a good taste?
The freezing point of water decreases as salt dissolves.
The freezing point of water increases as salt dissolves.
The boiling point of water increases as salt dissolves.
The boiling point of water decreases as salt dissolves.
Answer:
The answer is option 3.
Explanation:
When salt is added to the water, the boiling point increases because it needs to take in more energy from heat to break down the bonds and dissolve the salt in the water.
(Correct me if I am wrong)
Identify what type of reaction is below. Also determine what coefficients that would balance the chemical equation. ___ HCl + ___Zn → ___ H2 + ___ZnCl2 A) Double Replacement; 2, 1, 1, 1 B) Single Replacement; 2, 1, 1, 1 C) Synthesis; 1, 2, 1, 2 D) Double Replacement; 1, 2, 1, 1
Answer:
Single Replacement; 2, 1, 1, 1
Explanation:
2HCl + Zn → H2 + ZnCl2
In a single replacement reaction, one specie is replaced by another specie in a chemical reaction.
If we look at the reaction above, zinc metal reacted with hydrochloric acid. The reaction proceeds in such a manner that zinc replaces hydrogen in hydrochloric acid. This is a single replacement reaction because only one chemical specie is displaced in the reaction.
The Sl symbol for volume is
Volume = Mass / Density
Thus
Volume = kg/m³
or
[tex]Volume = kgm^{-3}[/tex]
Which best describes what happens when a neutral atom becomes a positive
ion?
O
A. The remaining electrons spread farther out.
O
B. The excess protons pull harder on the fewer electrons
O
C. The remaining electrons are more easily lost.
O
D. The excess protons push the remaining electrons away
Answer: the answer is b
Explanation:
The formula for sulfuric acid is H2SO4. A mole of sulfuric acid would have a mass of ___ grams.
Answer:
98.0795 g
Explanation:
The molar mass of sulfuric acid is 98.0795 g/mol . This means that every mole of sulfuric acid has a mass of 98.0795 g.
15.) Solar energy, wind, and geothermal are what type of energy resource?
a.) Inexhaustible
b.) Inexpensive
c.) Nonrenewable
d.) Chemical
Answer:
a,) inexhaustible energy resources
What is the same about the moon’s rotation and revolution around Earth?
Answer:
The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. ... When the moon is between the Earth and the sun, during the new moon phase, the back side of the moon is bathed in daylight.
Explanation: endg 2020 ;]
Describe the celestial object in the image. The object is called a because it is producing and has not yet .
The image, blanks and options are missing in the question. So the image is attached below and the complete question is:
Describe the celestial object in the image.
The object is called________ a because it is producing _______ and has not yet ________ .
First Blank: A.Meteor B.Meteorite C.Meteoroid
Second Blank: A. a streak of light B. An orange Horizon C. A star- Filled sky
Third Blank: A. Reached earths atmosphere B. Struck Earth C. Completed an orbit
Answer:
First Blank - A. Meteor
Second Blank - A. a streak of light
Third Blank - A. Reached earths atmosphere
Explanation:
The given image shows celestial object called meteor.
The meteor is often called shooting star as it produces a streak of light. When a meteoroid reaches Earth's atmosphere, it experiences a friction which allows the meteoroid to burn up and produce a streak of light in the sky.
Hence, the correct answer for blanks is Meteor, a streak of light and Reached earths atmosphere.
How does Q compare to Keg?
O Q> Keq
O Q< Kea
OQ = Keg
Answer:
Q<Keq
Explanation:
just found out they ask this question twice,
the one on top is right but for the second time this question is asked.
my answer is right for the first time it is asked.
thank you for your time.
In chemical equilibrium, the equilibrium constant is greater than reaction quotient that is Q< Keq.
What is chemical equilibrium?Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.
Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.
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Desert plants have to adapt to a harsh environment. Many desert plants such as the rabbitbrush have small leaves, why? A) large leaves weigh too much B) small leaves reflect the sunlight C) small leaves taste bad to the animals D) small leaves conserve water by reducing transpiration
Answer:
D
Explanation:
they conserve water using less transpiration
Answer:
Hello! Your answer would be, D)Small leaves conserve water by reducing transpiration
Explanation:
Hope I helped! Brainiest plz!♥ Have a nice morning! Hope you make a 100%! -Amelia
Big question for physicists out there:How can we be sure dark matter actually exists in our universe?
Answer:
We can see the bright matter, like stars, but we know some other matter is there(dark matter)because of how it pulls on the bright matter.
Explanation:
What is the molarity of 0.945 L of a solution that contains 0.227 moles of Fe(NO3)3?
Answer:
0.2402 M
Explanation:
0.945 L sol contains = 0.227 moles
1 L sol will contain = (0.227/0.945)*1 = 0.2402 moles
Molarity = 0.2402 moles/L or M
What mass of NaOH must be added to the solution to increase the concentration to 30.00% by mass?
Answer:1) 0.0625 g.
2) 0.0125 g.
3) 80.0 g If this right please try to help me!
Answer:0.0125
Explanation:on edge
Imagine you see a famous person.
Which best explains the process of how your nervous system “senses” the person, then instructs you to ask for an autograph?
A eyes-spinal cord-mouth
B brain-eyes-mouth
C eyes-spinal cord-brain-spinal cord-mouth
D eyes-brain-mouth
1 point
A chemical cell differs from an electrolytic cell because in a chemical cell
there is
A) a positive and negative electrode
B) an anode and a cathode
C) a redox reaction that produces an electric current
D) an electric current that causes a redox reaction
Nahi which
Answer: C) a redox reaction that produces an electric current
Explanation:
Chemical cell is a device which is used for the conversion of the chemical energy produced in a redox reaction into the electrical energy. The cell consists of the negative terminal called as anode where oxidation takes place and a positive terminal called as cathode where reduction takes place.
Electrolytic cell is a device which is used to carry out chemical reactions by the use of electrical energy. The cell consists of the negative terminal called as cathode where reduction takes place and a positive terminal called as anode where oxidation takes place.
What is the solution to the problem expressed to the correct number of significant figures?
12.0/7.11 = ?
A. 1.688
B. 1.69
C. 1.7
D. 1.70
Answer:
B
Explanation:
Answer:
B. 1.69
Explanation: