Answer:
hydrogen
Explanation:
In the reaction between carbon dioxide and hydrogen gas, the species which oxidized is hydrogen. Hydrogen in this reaction oxidizes from 0 to +1 oxidation state.
What is oxidation ?Oxidation is the reaction with oxygen or loss of an electron in a reaction to form the upper oxidation states. The change in oxidation state depends on the number of electrons lost.
The given reaction is written as follows;
[tex]\rm H_{2} + CO_{2} \rightarrow CO+ H_{2}O[/tex]
In this reaction, one mole of hydrogen gas reacts with one mole of carbon dioxide giving carbon monoxide and water.
In H₂ state, hydrogen is in zero oxidation state. But in water, H is in +1 oxidation state. In carbon dioxide, carbon is in +4 oxidation state and in CO it has +2. Hence, the oxidized species is hydrogen.
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If the solubility of sugar at 25ºC is 211 g/100 g H2O, what mass of sugar can be dissolved in 300 g of H2O?
633 g of Sugar
105.5 g of Sugar
422 g of Sugar
844 g of Sugar
Answer:
633 grams of sugar can be dissolved in 300 g of H₂O
Explanation:
Solubility is the measure of the ability of a certain substance to dissolve in another and form a homogeneous system. Solubility is then the maximum amount of a solute that a solvent can receive and is expressed by concentration units.
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
Then:
[tex]x=\frac{c*b}{a}[/tex]
You can apply the rule of three as follows: if by definition of solubility in 100 grams of H₂O there are 211 grams of sugar, in 300 g of H₂O how much sugar is there?
[tex]sugar=\frac{300 grams of H_{2}O *211 grams of sugar}{100 grams of H_{2}O}[/tex]
sugar= 633 grams
633 grams of sugar can be dissolved in 300 g of H₂O
Answer:
[tex]X g\ sugar=633 g \ sugar[/tex]
Explanation:
Hello,
In this case, solubility is defined as a condition wherein the amount of a solute has been completely dissolved in a certain amount of solvent and it is temperature-dependent as well. In such a way, for the given solubility at 25 °C, we understand that 211 g of sugar are completely dissolved in 100 g of water, therefore, for 300 g of water, we can compute the completely dissolved mass of sugar by using the following rule of three:
[tex]211g\ sugar \rightarrow 100 g \ water\\\\X g\ sugar \rightarrow 300 g\ water\\\\X g\ sugar =\frac{300g\ water * 211g\ sugar}{100g \ water}\\ \\X g\ sugar=633 g \ sugar[/tex]
Best regards.
what term is best associated with protons or neutrons escaping to become more stable?
A. Nucleus
B. Radioactive Decay
C. Quark Deterioration
D. Particle Transfer
Which one of the following word equations represents a neutralization reaction? A) salt + water → acid + base C) base + acid → salt + water B) base + salt → water + acid D) salt + acid → base + water
Part B is the correct answer.
When base and acid react, the result is salt and water.
Therefore....
Base+acid = salt+water
A substance that can be broken down and recycled by bacteria and other decomposes is said to be__________
Answer:The substance is Biodegradable
Explanation:
When something is biodegradable it can be broken down by organical processes or decomposers.
How do you draw acetone using a Bohr model?
Explanation:
this is the one i found.....
Elements found in the same period on the periodic table have the same...
Group of answer choices
Number of neutrons
Number of Valence Electrons
Number of Energy Levels
Properties
Answer:
valence electrons
Explanation:
Which represents the balanced nuclear equation for the beta minus decay of Co-60?
Superscript 60 subscript 27 upper C o right arrow superscript 60 subscript 26 upper F e plus superscript 0 subscript plus 1 e.
Superscript 60 subscript 27 upper C o right arrow superscript 60 subscript 28 upper N i plus superscript 0 subscript negative 1 e.
Superscript 60 subscript 27 upper C o plus superscript 0 subscript plus 1 e right arrow superscript 60 subscript 28 upper N i.
Superscript 60 subscript 27 upper C o plus superscript 0 subscript negative 1 e right arrow superscript 60 subscript 26 upper Fe.
Explanation:
Superscript 60 subscript 27 upper C o right arrow superscript 60 subscript 28 upper N i plus superscript 0 subscript negative 1 e.
Answer:
Its B
Explanation:
Did the test and got 100%
How can a scientist ensure that his or her data are reliable? by making a single observation by repeating trials during an experiment by recording values without units by keeping the results private
Answer:by repeating trials during an experiment.
Explanation:
.
Answer:
its b
Explanation:
When volcanoes errupt, they can release oxides of sulphur that react with tiny droplets of water in the air to form sulphuric acid. Sulphuric acid can be considered a(n) __________.
A)
greenhouse gas
B)
primary pollutant
C)
biofuel
D)
secondary pollutant
E)
ecotone
What is the pressure in a 5.00 L tank with 23.50 grams of oxygen gas
at 350 K?
Answer:
not sure I would 41.70
Explanation:
Which of the following is equal to 0.500 mol?
A. 32.0 g O(2)
B. 103.6 g Pb
C. 36.0 g H(2)O
D. 14.0 g CO(2)
help please
Answer:
B
Explanation:
Think about the molar masses of each.
O2 -> 32 g
So 32 g = 1 mol.
Pb -> 207.2 g
So 103.6 g = .5 mol!
H2O -> 18 g
So 36 g = 2 mol.
CO2 -> 44 g
So 14 g = .3 mol
Use the chemical equation below to answer the following two questions.
As(OH)3(aq) + H2SO4(aq) → As2(SO4)3(aq) + H2O(1)
3. When the above equation is balanced, what is the stoichiometric coefficient for As(OH)3?
(a) 1
(b) 2
(C) 3
(d) 4
(e) 5
4. When the above equation is balanced, what is the stoichiometric coefficient for H2O?
(a) 1
(b) 2
(C) 4
(d) 6
(e) 8
Raising or lowering temperature. What happens to the pressure? Is this a direct or indirect relationship?
Answer:
Explanation:
The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.
Ideal gas law is valid only for ideal gas not for vanderwaal gas. To see the relation between pressure and temperature we need ideal gas equation. Pressure is directly proportional to the temperature.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
According to above equation we can see that pressure is directly proportional to temperature. On increasing the temperature the kinetic energy of gaseous molecules increases and hence the pressure on the walls of container increases.
Therefore, pressure is dircetly proportional to the temperature.
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The dotted line between 0- and H+ represents a
-0)
A)
covalent bond between the two oppositely charged ions.
B)
o
hydrogen bond, a weak bond between a hydrogen and an electronegative
atom.
strong, short-distance bond that is responsible for the unique properties of
water.
polar covalent bond that results from the unequal and opposite charges of
the ions.
D)
Answer:
hydrogen bond, a weak bond between a hydrogen and an electronegative
atom.
Explanation:
Hydrogen bonding, is an intermolecular or intramolecular interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons; such a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces. Hydrogen bonds can exist between atoms in different molecules or in parts of the same molecule.
A hydrogen bond is a type of dipole-dipole interaction; it is not a true chemical bond. These attractions can occur between molecules (intermolecularly) or within different parts of a single molecule (intramolecularly) as explained above.
Oxygen is strongly electronegative. Hydrogen bonds are observed when hydrogen is bonded to strongly electronegative species such as oxygen. Hydrogen bonds account for the high boiling point of water.
PLS HELP!! WILL MARK BRAINLIEST TO RIGHT ANSWER!!!
1.If a substance has a large mass and a small volume, what can you conclude about it?
A.It is very dense.
B.It will float on water.
C.It is made out of rock or metal.
D.It has a low density
2. What is the difference between weight and mass?
A.Weight depends on density and mass depends on gravity.
B.Weight depends on gravity and mass depends on volume.
C.Mass depends on gravity and weight is constant.
D.Weight depends on gravity and mass is constant.
3. Which of the following units is rarely, if ever, used in science labs?
A.Centimeter
B.Gram
C.Quart
D.Milliliter
4. One side of a cube is 5 cm long. What is the cube's volume?
A.5 cubic cm
B.15 cubic cm
C.25 cubic cm
D.125 cubic cm
5. What is the best synonym for "property?"
A.Possession
B.Attribute
C.Virtue
D.Quantity
Answer:
1. A) Its very dense
2. D) weight depends on gravity and mass is constant
3. C) Quart
4. D) 125 cubic cm
5. B) Attribute
Explanation:
what is the oxidation number of sulfur in CaSO3 ( 3 is a subscript)?
Answer:
It’s +6
Explanation:
Oxidation number refers to the total number of electrons gained or lost during a chemical reaction.
In the example above sulphur has an oxidation number of +6 while the oxidation number for the calcium in CaSO4 is +2 the oxidation number for oxygen is -2.
It takes about __________________________ for Earth to rotate one time.
Answer:
24 hours
Explanation:
Therefore we have 24 hours in a day
!: (a) 20 cm: 80
10. Some mercury is poured into a capillary tube of
uniform bore and one end closed. When the tube
is held horizontally, mercury column has a length
of 4 cm and air enclosed in the closed end has a
length of 10 cm. If the tube is now held vertically,
with open end upwards, the length of the air
column will be (take atmospheric pressure at the
Tale place of experiment to be 760 mm)....
(a) 10.5 cm . (6) 8.5 cm ",JI
(c) 9.0 cm mati (d) 9.5 cm 0
Answer:
THE LENGTH OF THE AIR COLUMN IS 9.5 CM
Explanation:
Taking the atmospheric pressure to be 760 mmHg;
When the capillary tube is held horizontally, the pressure of the tube is 760 mmHg
when the capillary tube is held vertically, the pressure increases by 4 cm = 40 mm
The new pressure of the tube is hence, 760 + 40 mmHg = 800 mmHg
Using the pressure forlmula;
P1 V1 = P2 V2
P1 A1 L1 = P2 A2 L2
where A1 and A2 is the area of the capillary tube and it is equal, it cancels out.
P1 l1 = P2 l2
l2 = P1 l1 / P2
l2 = 760 * 10 / 800
l2 = 9.5 cm
The length of the air in the tube is 9.5 cm.
PLEASE I NEED HELP WITH THIS LAST PROJECT!!!!!!
1. How do the physical properties of the slime differ from the physical properties of the glue and borax alone?
2. Stretch the slime slowly. Can you make a sheet thin enough to see through?
3. Form the slime into a roll. What happens if you pull the ends of the roll quickly? What happens if you pull it slowly?
4. Put a clean beaker on a table upside down. Roll the slime into a ball and place it on top of the beaker. Describe what
has happened after 30 minutes.
5. Roll the slime into a ball. Does it bounce?
6. Do some research on polymers. Make a list of 20 items around the house that are composed of polymers. (Hint:
Read labels!)
Answer:
1.Borate ions, provided by the borax (hydrous sodium borate), cause the vinyl molecules in the glue to form cross-linked bonds. The process of cross-linking continues to alter the physical properties of the polymer. As more and more bonds are formed, the characteristics of the polymer change.
2.
If we pull the ends of the roll quickly, it will break.
If we roll the slime into a ball and place it on top of the beaker it slowly flow down.
3.When you pull slowly, your slime will stretch. However if you pull quickly it will break. Slime will slowly flow making it seem like a liquid, but it can also bounce which makes it seem a bit like a solid.
4.If we roll the slime into a ball and place it on top of the beaker it slowly flow down. After 30 minutes, slime will settle and behave as a solid, because water evaporates.
5.Yes, the slime ball will be able to bounce.
6.High Density Polyethylene, HDPE : bottle caps, folding tables and chairs, food storage containers, plastic bags, water pipes for domestic water supply. MDPE : shrink film, carrier bags, screws and enclosures. Linear LDPE : toys, lids, buckets, containers, bubble wrap.
Explanation:
In birds, having long feathers (L) is dominant to short feathers (l). A homozygous dominant bird and homozygous recessive bird mate. After creating a punnett square, give the genotypes and phenotypes of the four resulting offspring (include the number of each)
Answer:
The four are Ll
The four will have long feathers
Explanation:
A Punnett square is a graphical representation of all possible genotypes of an offspring that is likely to arise from a particular cross or breeding event. To create a Punnett square, knowledge of the genetic composition of the parents is highly required. The two things a Punnett square can tell you are the genotypes and phenotypes of the offspring. In its simplest form, the Punnett square consists of a square divided into four quadrants. A Punnett square allows the prediction of the percentages of phenotypes in the offspring of a cross from known genotypes.
The genotypes of the four offsprings are Ll, Ll, Ll and Ll. This implies that they are all heterozygous. They will all have long feathers since the long feather (L) is dominant in all the species. In terms of phenotype, they will all have long feathers.
The figure is a square. Its diagonals meet to form four right
angles. What is the approximate value of x?
O 2.8 units
O 3.3 units
O 4.0 units
O 5.7 units
Answer:
D
Explanation:
ed2020
The approximate value of x is 5.7 units. It can be determined by Pythagoras' theorem. Therefore, option D is correct.
What is Pythagoras' theorem?Pythagoras' theorem is a fundamental theorem in mathematics. It describes the relationship between the sides of a right-angled triangle. It states that the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. Mathematically it is expressed by: H² = B² + P²
Given,
Base = x units
Perpendicular = x units
Hypoteneus = 8 units
The triangle formed in the figure is a right-angle triangle.
Thus, by Pythagoras' theorem,
H² = B² + P²
8² = x² + x²
64 = 2x²
x² = 64/2
x² = 32
x = √32
x = 5.7 units
Therefore, the correct option is D.
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Take a look at this dandelion. The yellow flower on the right is _______ pollinated and the seeds on the left are transported by ___________. A) wind; water B) insect; wind C) insect; birds D) animals; water
Answer:
Insect and wind are the correct answer
Explanation:
Just took the test on USA Test Prep
During an experiment, Stephanie found 4.5 mg of iron in a 750 g water sample. How many parts per million of iron are in the water sample ?
Answer:
6ppm
Explanation
We'll begin by calculating the concentration of the solution in mg/g. This is illustrated below:
Mass of iron = 4.5mg
Mass of water = 750g
Concentration in mg/g = 4.5/750 = 6×10¯³mg/g.
Now, we can obtain the concentration in ppm as follow:
1mg/g = 1000ppm
Therefore, 6×10¯³mg/g = 6×10¯³ x 1000 = 6ppm.
Which of the following happens to a molecule of an object when the object is cooled?
O its temperature increases.
It loses kinetic energy.
O its size increases.
It moves faster
Question 16 Multiple Choice Worth 1 points)
(01.02 MC)
ro
The molecular theory states the movement and collision of the molecules in a matter. When an object is cooled, then the molecule loses its kinetic energy. Thus, option B is correct.
What is the kinetic molecular theory?The kinetic molecular theory explains the composition and the motion of the particles in matter. It assumes that the particles move constantly in the matter and have insignificant volume and intermolecular forces.
The particles show elastic collisions that use the ideal gas equation to show the effect of the temperature on the kinetic energy. The kinetic energy has a direct relationship with the temperature.
A decrease in temperature(cooling) of matter causes the particles to slow down their speed of collision which results in a loss in kinetic energy and is used as the principle to change liquid into solids.
Therefore, option B. the decrease in temperature reduces the kinetic energy.
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When Luis burns wood in a campfire, the particles in the wood break down and energy is released. What type of energy does the wood contain before Luis burns it?
heat
electrical
chemical
light
Answer:
chemical energy is stored in the wood before combustion.
8 points
11. Humans have negatively impacted the environment for years. Which
events represent ways humans have harmed the environment. (Choose all
that apply.)
burning fossil fuels
minning
planting trees
using solar power
using fertilizers
recycling
Answer:
Burning fossil fuels
Mining
Using fertilizers
What is the frequency of an electromagnetic wave that has a wavelength of
7.6 x 10^-6 m in a vacuum? (The speed of light in a vacuum is 3.00 x 10^8
m/s.)
A. 2.3 x 10^3 Hz
B. 1.3 x 10^5 Hz
C. 4.0 x 10^13 Hz
D. 2.5 x 10^-14 Hz
Answer:
D. 2.5 x 10 ^-14 Hz
Explanation:
Use wavelength formula: v = f x wavelength
Rearrange formula for frequency.
f = wavelength / v
f = 7.6 x 10 ^-6 / 3.00 x 10 ^8
f = 2.5 x 10^-14 Hz
What happens first during cellular respiration?
A. The movement of small organic molecules into a mitochondrial
B. The breakdown of food molecules into smaller organic molecules
C. The formation of many molecules of ATP
D. The breakdown and small organic molecules into carbon dioxide
Answer:
b
Explanation:
ape ex
During cellular respiration, the first step is the breakdown of food molecules, such as glucose, into smaller organic molecules, specifically in a process called glycolysis. This process occurs in the cytoplasm of the cell and does not require oxygen. The breakdown of glucose results in the formation of two molecules of pyruvate.
After glycolysis, depending on the availability of oxygen, further steps of cellular respiration occur. If oxygen is available, the pyruvate molecules enter the mitochondria, where they undergo further breakdown through processes like the Krebs cycle and oxidative phosphorylation, resulting in the production of ATP (adenosine triphosphate), which is the primary energy currency of the cell.
Therefore, option B, the breakdown of food molecules into smaller organic molecules, is the first step in cellular respiration.
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The graph below shows the electronegativities of the elements in the periodic table. A graph with the horizontal axis labeled period and marked with entries from 0 to 6, and a vertical axis labeled Chi p, with entries 0.5 to 4.5 in increments of 0.5. All data are approximate. Group 17 is represented by an orange line, with coordinates 2, 4; 3, 3.75; 4, 3; 5, 2.75. Group 16, dark red: 2, 3.5; 3, 2.5; 4, 3.5; 5, 2.25. Group 15, brown: 2, 3; 3, 2.25; 4, 2.25; 5, 2.25; 6, 2.25. Group 16, light green: 2, 2.5; 3, 2; 4, 2; 5, 2; 6, 2.5. Group 13, dark green: 2, 2; 3, 1.75; 4, 1.75; 5, 1.75; 6, 1.5. Group 2, blue: 2, 1.5; 3, 1.25; 4, 1; , 5, 1; 6, 1. Group 1, purple: 2, 1; 3, 1; 4, 0.9; 5, 0.9; 6, 0.9. Which would least strongly attract electrons from other atoms in a compound? elements of group 1 elements of group 2 elements of group 15 elements of group 17
Answer:
The elements in group one
Explanation:
The elements of group 1 would least strongly attract electrons from other atoms in a compounds.
What is Shielding Effect?The inner electrons shield the outer electrons from the nuclear force thereby reduce the nuclear hold on outermost electrons.What is the Explanation?Generally metals have more tendency to lose the electrons and non metals have more tendency to gain the electronsFor metals it is easier to lose their valence electrons because metals nuclei do not have a strong pull on their valence electrons due to sheilding effectLearn more about shielding effect here
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What is the definition of a Lewis base?
a substance that donates a proton
a substance that donates electrons to form a covalent bond
a substance that accepts electrons to form a covalent bond
a substance that when dissolved in water increases hydrogen ion concentration
Answer:
the definition is : a compound or ionic species which can donate an electron pair to an acceptor compound.
so as far as i know i know the answer is: a substance that accepts electrons to form a covalent bond.
please mark me brainliest may god bless you...
Explanation:
The definition of a Lewis base is: C. a substance that accepts electrons to form a covalent bond.
What is a Lewis base?
A Lewis base can be defined as a specie of an ionic or chemical compound that contains an empty orbital which allows it to donate an electron pair (two or more electrons) to form a covalent bond.
This ultimately implies that, a Lewis base is a chemical substance that accepts an electron pair (two or more electrons) to form a covalent bond.
Examples of a Lewis base.In Chemistry, some examples of a Lewis base include the following:
[tex]OH^-[/tex]CO[tex]H_2O[/tex]ROH[tex]NH_3[/tex]Read more on Lewis base here: https://brainly.com/question/3655338