Answer:
They reduce the bond angle to be slightly lower than the tetrahedral bond angle, approximately 104.45 degrees.
Explanation:
The unshared pair of electrons or lone pair electrons in order to have the minimum repulsion possible with each other pushes the other bonding pairs closer together making the bond angle smaller or bent.
The bond angle is slightly lower than the tetrahedral bond angle of 108 degrees, leaving the water molecule with a bent molecular geometry.
In plants, algae, and some bacteria, energy is produced by the:
A. nucleus
B. chloroplast
C. vacuole
D. mitochondria
Answer: D?
Explanation: The mitochondrion (plural mitochondria) is a membrane-bound organelle found in the cytoplasm of eukaryotic cells. It is the power house of the cell; it is responsible for cellular respiration and production of (most) ATP in the cell.
Rank the electronegativity values of lithium, oxygen, potassium, and selenium from lowest to highest
Answer:
Potassium < lithium < Selenium < Oxygen
Explanation:
Oxygen has the highest electronegativity value from the given choices.
Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons.
It is a measure of the relative tendency with which atoms of the element attracts valence electrons in a chemical bond.
Down a group, electronegativity reduces and across the period from left to right, it increasesPotassium and lithium are in group 1 , selenium and oxygen are group 7;
So group 1 elements will have lower electronegativity value.
Potassium is below lithium in group 1 and its electronegativity value will be lower.
Selenium is below oxygen and also, its electronegativity value is lesser.
The electronegativity values of lithium, oxygen, potassium, and selenium from lowest to highest is potassium, lithium, selenium and oxygen.
The electronegativity of an element is a measure of the tendency of an atom of element to attract bonding pair of electrons. Electronegative elements have the ability to attract shared electrons of covalent bonds to itself.
The most electronegative element is fluorine. Electronegativity increases across the period in the periodic table .
Electronegativity decreases down the group in the periodic table. Generally metallic elements are have lower electronegativity. This is because they mostly give out there electrons.
Therefore, the electronegativity values of lithium, oxygen, potassium, and selenium from lowest to highest is potassium, lithium, selenium and oxygen.
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The substance on which the enzyme acts is called the _____ chemical.
A. Substrate
B. Complex
C. Catalyst
Answer:
the answer is A
Explanation:
it is substrates because ,Enzymes are specialized proteins that catalyze or speed up chemical reactions within cells. The substance upon which an enzyme acts is called a substrate. Substrates are small molecules.
The substance on which the enzyme acts is called the substrate chemical. Therefore, the correct option is option A.
Enzymes are biological molecules that function as catalysts, facilitating and speeding up chemical reactions without being devoured or irreparably changed. The term "substrate" refers to the material that the enzyme reacts with.
An enzyme forms an enzyme-substrate complex when it comes into contact with its particular substrate and attaches to it at a location known as the active site. This contact makes the chemical reaction more rapid than it would be in the absence of the enzyme by lowering the activation energy necessary for the reaction to occur.
Therefore, the correct option is option A.
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What is Newton's First Law known as? The Law of
____
Answer:
inertia
Explanation:
Answer:
Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Explanation:
hope it helps, please mark brainliest
If the half-life of substance A is 1.5 years, how long would it take an 8.0 gram sample of stances A to decay such that only 1.0 gram remained?
Answer: 4.5 Years
Explanation:
8 -> 4 -> 2 -> 1
Substance goes through 3 Half-Lives
3 Half-Lives x 1.5 Years = 4.5 Years
Answer:
4.5 i think
Explanation:
In the above picture, suppose the rod was follow instead of solid. Which statement is correct?
Due to convection, glob A will melt faster
Due to conduction, glob C will melt first
Due to convection, glob A will take longer to melt
Due to conduction, glob A will melt faster
Answer:
Due to conduction, glob A will melt faster
Nuclear fusion, like the example here, produces huge amounts of energy. Consider the statements below. BUT ONE statement provides more information about nuclear fusion
Answer:
Explanation:
Nuclear fusion of a form of nuclear reaction in which two small atomic nuclei combines to form larger ones with the release of a large amount of energy.
For example;
²₁H + ²₁H → ⁴₂He + Energy
The energy released in a nuclear reaction provides the needed temperature for another set of ²H atoms to fuse. This process in turn yields another ⁴He with the release of a lot of energy. Thus, enormous release of energy accompanies a nuclear reaction.
It is based on this principle that an hydrogen bomb is formed.
Answer:
Where are the answer choices.......
Explanation:
Help please
When you have two
isotopes of an atom, Carbon-12 and Carbon-13 for example, what has changed in the atomic structure?
A. Number of protons
B. Number of electrons
C. Number of neutrons
Using the periodic table, choose the more reactive nonmetal.
Br or As
Answer:
Br
Explanation:
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.
HEEEEeEELP PLEasE! IS SCIENCE
What is the difference between absorption and scattering
Answer:
scattering is the direction of transmission absorption is the particle absorbs the energy of the photon
Explanation:
Which is more acidic – milk of magnesia or lemon juice? What is the difference in acidity between the two? (milk of magnesia = pH 10.5, lemon juice = pH 2.5)
Answer:
Lemon juice because it has more of a sour taste to it than a watery taste like milk
Explanation:
what makes electrons jumo to other orbits around the nucleus then fall again?
Answer:
The higher the excitation state, the more energy the electron contains. When an electron absorbs energy, it jumps to a higher orbital. ... An electron in an excited state can release energy and 'fall' to a lower state.
Answer:
the higher the excitation state, the more the energy the electrons contains. when an electrons absorbs energy , it jumps to a higher orbital.
Explanation:
the electrons with its extra packet of energy becomes excited , and promptly moves out of its lower energy level and takes up a position in a higher energy level
HY
Warm
Cool
Is this a land or a sea breeze?
Answer
Explanation:
Recall that the land surface cools quicker than the water surface at night. Therefore, the warmer air over the ocean is buoyant and is rising. The denser cool air over the land is flowing offshore to replenish the buoyant warm air and is called a land breeze.
Contour plowing, conservation plowing and crop rotation are ways to __________ soil. a. prevent c. lose b. conserve d. none of the above
Explanation:
prevent becoz crop rotation means using it by planting the crop according to nuetrients so ur soil is prevented
What is the name of the compound (NH4)2SO4
Na+ is an ion give reasons
Answer:
Na+ represents a sodium atom that has lost an electron.
Explanation:
An atom that has gained or lost electrons is called an ion.
Answer:
I think because of the positive radical it's carrying
The curved upper surface of a liquid in a column of liquid?
Answer:
The answer would be meniscus.
how many protons neutrons and electrons does Francium have?
What would red litmus paper be used to determine?
A. If a solution is acidic or neutral
B. If a solution is basic or neutral
C. If a solution is acidic
D. If a solution is supersaturated
Answer:
determines if a solution is acidic.
Explanation:
Which chemical equation is balanced?
OA CO, + H,0 - H,CO,
O8 Mg0+ 2HCI - MgCly + H,0
O0 Ca0, + HCI CaCl, + H,0
O0K H,0- K,0 +H,
The chemical balanced : A and B
Further explanationGiven
Chemical equation
Required
Balanced equation
Solution
A chemical equation is said to be balanced if the number of atoms in the reactants and the number of atoms in the product are the same
a. CO₂+H₂O⇒H₂CO₃
balanced
b. MgO+ 2HCI ⇒ MgCl₂ + H₂O
balanced
c. CaO + HCI ⇒ CaCl₂ + H₂O
the elements H and Cl are not balanced
d. K + H₂O ⇒ K₂O +H₂
element K is not balanced
Capture energy from sunlight and use it to produce food for the cell; perform
photosynthesis
O cell membrane
O cell wall
O Mitochondria
O chloroplasts
Answer:
The answer is option 4.
Explanation:
Chloroplast is the place where they absorb sunlight to perform photosynthesis to produce food.
The density of lead is 11.3g/ml. What is the volume in ml of 50.75g of lead?
Answer:
4.49 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{50.75}{11.3} \\ = 4.491150...[/tex]
We have the final answer as
4.49 mLHope this helps you
2. Vessels that carry blood back to the heart are called
O a. capillaries
b. arteries
O c. veins
O d. both band c
Answer:
the answer for your question is veins
Answer:
blood vessels aka veins
How many moles of CO2 are found in 2.5 L of CO2?
Answer: 2.5L x 1mol/22.4 = 0.112 mol
Explanation:
Diffraction is a wave property that electrons possess
- true
- false
Answer:
The given statement is "True". A further explanation is provided below.
Explanation:
Diffraction occurs mostly with general noise, with electro-magnetic radioactive material, such as visible region, x-ray, but mostly gamma rays, and with very small moving molecules, such as atomic nuclei, as well as electrons, that also have wavelike characteristics. Yet another side effect of diffraction is because there are no dramatic or rapid shadows.Therefore this obvious response is the right one.
Base your answers to questions 74 through 76 on the data table below and on your knowledge of Earth
science. The data table shows the mass of a sample of radioactive carbon-14 remaining after each half-life.
Data Table
Number of Half-lives Mass of Carbon-14 (9)
0
64
1
32
2
16
8
3
4
4
5
2
6
1
74 On the grid in your answer booklet, construct a line graph by plotting the data for the mass of carbon-14 in
the sample for each half-life shown on the data table. Connect the plots with a line. [1]
75 Identify the stable disintegration product of the radioactive isotope carbon-14. [1]
76 Determine the number of grams of carbon-14 remaining in this sample at 17,100 years. [1]
Answer:
See explanation
Explanation:
Now we have, the graph attached.the stable disintegration product of C-14 is N-14.
Then;
Since the mass of C-14 originally present is 64g, at a time t= 17100 years, we will have;
N/No = (1/2)^t/t1/2
N = mass of C-14 at time t
No= mass C-14 originally present
t = time taken for N amount of C-14 to remain
No = mass of C-14 originally present
t1/2 = half life of C-14
N/64 = (1/2)^17,100/5730
N/64 = (1/2)^3
N/64 = 1/8
8N = 64
N = 8 g
Which of the following describes scientists?
A. People with perfect understanding of science
B. People from different backgrounds
C. People with only one perspective
D. People with similar personalities
Answer:
A. People with perfect understanding of science
An atom of nitrogen would be stable if it bonded with how many atoms of chlorine?