11. (03.03 MC)
What best describes the bonding in a water molecule? (5 points)
O An oxygen atom shares an electron pair with each H atom.
O An oxygen atom shares a single electron with each H atom.
) An oxygen atom receives an electron from each H atom.
O An oxygen atom transfers an electron to each H atom.
Answer:
A) An oxygen atom shares an electron pair with each H atom.
Explanation:
One of your classmates tells you, “Since atoms are the basic building blocks of matter, all atoms have to be the same. Do you agree or disagree with this statement? Explain your reasoning.
Physical properties of reactants: Physical properties of products: 12.
When you mix baking soda (a white powder) and vinegar (a clear liquid), you produce carbon dioxide gas. Describe the properties of the reactants and products to show that a chemical change has occurred.
Answer: The reactants are baking soda and vinegar. Baking soda is a white powder, and vinegar is a clear liquid. The products of this reaction are carbon dioxide, water, and sodium acetate. Carbon dioxide is a colorless gas, water is a colorless liquid, and sodium acetate is a white crystalline powder.
A chemical change can be seen in how the molecular formulas of the products are different from the reactants, since the reactants have chemically changed into completely different molecules.
Hope this helps
i need help with the one that asks what a genotype is and phenotype and how they are related i’ll give brainliest on whoever is right
Answer:
See the answer below
Explanation:
Genotype refers to the genetic composition of a trait while phenotype refers to the physical representation of a trait in relation to the environment. The genotype of a trait' or of an organism largely determines how the trait would be physically expressed, barring some environmental influence. It gives instructions on how a trait is physically represented.
Complete the nuclear equation
42 K → 0 e
19____-1
Answer:
42 19 K→42 20 Ca+e−
Explanation:
Naturally-occurring potassium atoms have a weighted average atomic mass of 39.10 (as seen on most modern versions of the periodic table.) Each potassium atom contains 19 protons p+ and thus an average potassium atom contains about 39.10−19≈20 neutrons n0.
This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.
What is the molarity of a solution prepared by dissolving 1.25g of HCl gas
into enough water to make 30cm3 of solution
The molarity of a solution : 1.13 M
Further explanationMolarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
mass HCl = 1.25 g
mol HCl(MW=36.5 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{1.25}{36.5}\\\\mol=0.034[/tex]
Volume of solution = 30 cm³ = 0.03 L
The molarity :
[tex]\tt M=\dfrac{0.034}{0.03}\\\\M=1.13[/tex]
TIME REMAINING 02:39:32 Carla draws two circuit diagrams that connect the same components in different ways, as shown. Which statement about the circuits is correct? The total resistance in Circuit A is greater than that in Circuit B. When a bulb in Circuit A goes out, the other bulbs keep shining. The bulbs in Circuit A shine brighter than those in Circuit B. When a bulb in Circuit B goes out, the other bulbs go out.
Answer: The total resistance in Circuit A is greater than that in Circuit B.
Explanation:
The statement which is true about the circuit is that the total resistance in Circuit A is greater than that in Circuit B.
What is circuit?An electronic circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires through which electric current flows.It can also be referred to as an electronic circuit.
It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.
There are three types of circuits , an analog circuit ,a digital circuit and a mixed circuit which is combination of digital and analog circuits , even semiconductors are used in circuits.
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Willie has fewer than normal bacteria in his gut microbiome. How will this affect his health?
Answer:
Indegestion I believe as there isn't as much bacteria to break down his food.
Explanation:
Tbh, dont complain if you don't like a food, because when you chew it, its gonna turn into some white mush anyways, and when it comes out, its brown.
Dont blame me, blame your tooth.
Which statement describes Newton’s law of universal gravitation?
Mass has little effect on gravity between objects.
Gravity pushes objects away from Earth’s center.
Gravity does not act between Earth and the moon.
Every object in the universe attracts every other object.
Answer: Its D the last one.
Explanation:
Answer: I believe it’s d but I will come back and tell you if it’s wrong
Explanation:
60 POINTS! PLEASE ANSWER!
In the bicarbonate buffering system, carbon dioxide and water join to form ___________, which dissociates into hydrogen and ________________.
In the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.
A buffer solution resists the changes in acidity by combining with the hydrogen ions that were added and inactivates them. It is a solution of weak acid and its conjugate base, (carbonic acid and bicarbonate). The natural conversion of carbon dioxide into carbonic acid is slow.
Bicarbonate buffer absorbs hydrogen ions and forms carbonic acid. The total number of hydrogen ions and hence the pH of the solution does not change. Bicarbonate is consumed and carbonic acid is produced when hydrogen ions are added.
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I NEED HELP ASAP ILL GIVE 10 POINTS
MY ELEMENT IS RHENIUM
1. Summarize the physical and chemical properties of the element you selected.
2. In the lesson, many models were used to depict the atom. How did these models help you understand atomic structure?
3. How do protons, neutrons, and electrons differ in terms of their electrical charges and locations within the atom?
4. Describe the four fundamental forces. Which of these forces are involved in chemical bonding?
Please answer these questions or at least one.
The element Rhenium is an inner transition element having 75 electrons, 75 protons and 111 neutrons.
What is rhenium?The element rhenium is one of the elements that belongs to the inner transition series. The element is known to have total 75 electrons, 75 protons and 111 neutrons. The relative atomic mass of the element have been placed at 186 g/mol.
The element is known to be massive and does form very massive complexes. The complexes of rhenium are very useful in industry. The models of the atom have helped to show the arrangement of the electrons, protons and neutrons in the element.
The protons are positively charged and they are found in the nucleus while the electrons are found shells and are negatively charged. The neutrons in the atom have no charge.
The four fundamental forces are metallic forces that holds atoms of metals together. The ionic bond that holds ions together, the covalent bond that holds atoms together in molecules and the dative bonds that leads to the formation of coordinate compounds.
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calculate the percentage of iron in iron (III) sulphate
Answer:
28.01 percent
Explanation:
Iron (III) sulphate, [tex]Fe_2(SO_4)_3[/tex], has 2 atoms of Fe.
One atom of Fe has a molar weight of 56. Hence, 2 atoms of Fe would have a total molar weight of 56 x 2 = 112 g/mol
Molar weight of [tex]Fe_2(SO_4)_3[/tex] = 399.88 g/mol
Percentage Fe in [tex]Fe_2(SO_4)_3[/tex] = 112/399.88 x 100%
= 28.01%
The percentage of iron is iron (III) sulphate is, therefore, 28.01 percent.
A theory has enough scientific support to be solidly accepted in the scientific community.
a.
A theory can be disproven.
b.
With further testing, a theory can become a law.
c.
A theory has enough scientific support to be solidly accepted in the scientific community.
d.
A theory explains why or how a phenomenon occurs.
e.
More than one of the four statements is false.
All the options from a) to d) are correct. Theory is a principle which explains a particular subject, or provides us with a general idea relating to it.
A theory can be disproven too if the stated principle or phenomenon does not fit with the explanation given by the theory. If a theory is accepted universally and tested properly, it can become a law too. A theory can be accepted or even rejected in a scientific community.
A theory can be modified overtime if more accurate predictions are given related to it, is based on facts, ideas and hypotheses.
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Which of the following is NOT one of the four pieces of evidence Wegener
used to validate his continental drift hypothesis?
Current global warming trends
O Apparent fit of the continents as a "puzzle"
O Past climate of the Earth seen in glaciers
O Correlation of fossils
Correlation of rocks and mountains
A liquid boils when its vapour pressure becomes equal to:
Answer:
atmospheric pressure
Explanation:
a liquid boils when its vapour pressure becomes equal to: atmospheric pressure
Answer:
equal to one atmosphere, the boiling point of a liquid is called the normal boiling point.
Explanation:
Use the periodic table above to help you compare the elements cesium (Cs, #55) and Calcium (Ca, #20). Which of the following statements is true about the valence electrons of these two elements? (1 pt)
*
1 point
Cesium has more valence electrons and they are in a higher energy level than calcium's valence electrons.
Cesium has fewer valence electrons but they are in a higher energy level than calcium's valence electrons.
Cesium has more valence electrons and they are in a lower energy level than calcium's valence electrons.
Cesium has fewer valence electrons and they are in a lower energy level than calcium's valence electrons.
The statement which is true about the valence electrons of cesium and calcium is as follows:
Cesium has fewer valence electrons but they are at a higher energy level than calcium's valence electrons.Thus, the correct option for this question is B.
What are Valence electrons?
Valence electrons may be defined as the number of electrons that are present in the outermost shell of any element. For example, Sodium has an atomic number of 11. Its electronic configuration is 2, 8, and 1. Here, one electron is present in the outermost shell, so, sodium has only one valence electron.
According to the electronic configuration, it is found that cesium has only one valence electron, while calcium has two. So, the number of valence electrons is more in calcium as compared to cesium.
But, the valence electron found in cesium is at a higher energy level due to the completed d-orbital.
Therefore, the correct option for this question is B.
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In a chemical reaction, it is the action of the___that is responsible for the changes taking place.
A. Protons
B. electrons
C. atoms
D. neutrons
A 1.87 mol sample of Ar gas is confined in a 45.5 liter container at 23.6 °C.
If the temperature of the gas sample is raised to 46.1 °C holding the volume constant, the average kinetic energy will
a. increase
b. remain the same
c. not enough information to answer the question
d. decrease
Answer:
a. increase
Explanation:
Based on the kinetic molecular theory of gases, the average kinetic energy of the system will increase.
The average kinetic energy is heat If temperature increases, heat of a system will also rise. According the kinetic molecular theory "the temperature of the gas is a measure of the average kinetic energy of the molecules"Therefore, due to the increase in temperature, the average kinetic energy of the system increases.
Non-living factors in an ecosystem are ______.
A. biotic
B. abiotic
C. antibiotic
PLEASE HELP!!!
Answer:
B. abiotic
Explanation:
in biology and ecology, abiotic components or abiotic factors are non living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.
A household cleaner has a pH around 10. It would be considered
a base.
an acid.
neutral.
a liquid.
What is a formula unit in an iconic bond
Answer:
A formula unit indicates the lowest whole number ratio of ions in an ionic compound. Because the positively and negatively charged ions in an ionic compound are arranged in a crystal lattice, there is no discrete particle comparable to a molecule.
Explanation:
Answer:
A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. ... Ionic compounds do not exist as individual molecules; a formula unit thus indicates the lowest reduced ratio of ions in the compound.
Explanation:
What is the energy of an object in motion depends on?
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measurements also show that a certain sample of the unknown compound contains of nitrogen and of oxygen. write the complete chemical formula for the unknown compound.
The chemical formula is the representation of the atoms of the molecule and compound involved in the reaction. The chemical formula for oxygen and nitrogen-containing atoms are N₂O₃.
What is the chemical formula?Chemical formulas are the representation of the coefficients or proportions of the atoms of the elements involved in the molecule or the chemical compound. It uses letters, symbols, numbers, arrows, etc.
Given,
Moles of oxygen = 6.2 mol
Moles of nitrogen = 4.1 mol
The moles of oxygen and nitrogen are divided by 4.1 as it is the smallest number:
N ÷ O = (4.1 ÷ 4.1) ÷ (6.2 ÷ 4.1)
= 1 ÷ 1.5
= 2 : 3
Therefore, N₂O₃ is the chemical formula.
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Your question is incomplete, but most probably your full question was, Measurements also show that a certain sample of the unknown compound contains 6.2 mol of oxygen and 4.1 mol of nitrogen. Write the complete chemical formula for the unknown compound.
one studrnt rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?
The Transfer of energy from one object to another through direct contact
Answer:
Conduction
Explanation:
Conduction is the transfer of energy from one molecule to another by direct contact.
Based on the information in the passage,
what can be determined about carbon as
a gas, liquid, and solid?
All three can be captured from fossil fuel
emissions.
Each one causes a negative chemical reaction in
other substances.
All three can be disposed of in ocean water for safe
storage.
Each one takes up a different amount of physical
space.
A gas, liquid, and solid can all be captured from fossil fuel emissions.
What is fossil fuel?
The term fossil fuel refers to the kind of fuel that is obtained from carbonaceous materials. This is the kind of material that serves as a source of energy for automobiles and for heating. It could also be used in the production of electricity.
The burning of fossil fuels leads to the emission of carbon which hurts the environment. Thus, from the passage, we can deduce the a gas, liquid, and solid can all be captured from fossil fuel emissions.
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6. Experiments are usually conducted one time and by one team to speed
up the scientific process.
True
False
Answer: false
Explanation:
If you wanted to take a solid nugget of silver and make it flow so that it can be shaped, how could you do it? you could...
Answer:
It should be heated
Explanation:
To change the solid nugget of silver to liquid so that it can be shaped, the solid mass should be heated to the melting point.
This change is a phase change from solid to liquidWhen the melting point of a substance is reached, the fixed lattice structure collapses. This allows for the particles to slide and flow relative to one another.Therefore a phase change from solid to liquid is attained by heating of the solid to melting point.