1. In a compound, chemical energy is contained in the (1 point)a. nuclei of the atoms.
b. unbonded electrons.
c. bonds.
d. movement of the electrons.
2. Which of the following statements is true about what happens during a chemical reaction? (1 point)
a. Bonds of the reactants are broken, and bonds of the products are formed.
b. Bonds of the reactants are formed, and bonds of the products are broken.
c. The bonds of both the reactants and the products are broken.
d. The bonds of both the reactants and the products are formed.
Answers
1. Potential of a chemical substances to undergo transformation in a chemical reaction is known as chemical energy. The chemical energy is stored in the bonds of chemical compounds.
Hence, in a compound, chemical energy is contained in bonds.
2. The process in which one or more substance known as reactants are converted to one or more completely new substances known as products are formed is known as a chemical reaction.
Hence, during a chemical reaction bonds of the reactants are broken, and bonds of the products are formed.
1.C 2.A are the answer to the following questions.
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Which is a cause of polarity in water molecules? partial negative charge on the hydrogen atoms partial positive charge on the oxygen atom high electronegativity difference between oxygen and hydrogen low electronegativity difference between oxygen and hydrogen
An example of an atom that has no charge is one that hasA. 1 proton, 2 electrons, and 3 neutrons. B. 3 protons, 1 electron, and 3 neutrons. C. 2 protons, 2 electrons, and 1 neutron. D. 3 protons, 2 electrons, and 1 neutron.
How many atoms are present in 4.0 Mol of sodium
Answers
b. The reaction always spends equal time in the forward and reverse direction.
c. There is equal processing for the concentration of reactants and products.
d. The reaction could spend more time in the reverse direction than in the forward direction.
Answers
The statement that is untrue concerning a reversible reaction is The reaction always spends equal time in the forward and reverse direction. The answer is letter B. The reset of the statements are true concerning the reversible reaction.
492 mm Hg
740 mm Hg
805 mm Hg
Answers
Answer:
805 mmHg is the pressure when the container is compressed
Explanation:
Initial Volume of the gas, V = 55.0 L
Initial Moles of the gas, n = 2.4 mol
Initial Pressure of the gas ,P=760 mmHg
initial temperature of the gas, T = 280 K
Using an Ideal gas equation:
...(1)
Final Volume of the gas, V '= 43.0 L
Final Moles of the gas, n' = 1.8 mol
Final Pressure of the gas = p'
Final temperature of the gas, T' =36 °C = 309 K
Using an Ideal gas equation:
..(2)
(1)=(2)
P' = 805 mmHg
805 mmHg is the pressure when the container is compressed.
PV=nRT
Pressure, Volume, n=moles, R gas constant, Temperature in Kelvin
P=nRT/V
(1.8mol)(62.36)(309K)/43.0L = 805mm Hg
light with any intensity above a certain frequency
light with any frequency below a certain intensity
light with any frequency above a certain intensity
Answers
The correct answer: (b) light with any intensity above a certain frequency
The explanation:
when Energy of a photon : E = hf
- The photoelectric effect works like this:
- If you shine light of high enough energy on to a metal, electrons will be emitted from the metal. Light below a certain threshold frequency, no matter how intense, will not cause any electrons to be emitted. Light above the threshold frequency, even if it's not very intense, will always cause electrons to be emitted.
Answer:
b
Explanation:
b. False
Answers
A) This fact is always true
Answers
The scientists use one of their five senses to gather information, they are making an observation.
What is an observation ?
The active gathering of data from a primary source is observation. Observation of living things makes use of the senses. Using scientific tools to perceive and record data is another way that observation may be used in science.
A technique for gathering information through observation of individuals, situations, or physical qualities as they are occurring naturally.
Using one or more senses, our observational abilities provide us with knowledge about things, occasions, attitudes, and occurrences. Being able to see and learn about the outside world is crucial because it forms the basis of effective communication.
Thus, option A is correct.
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Final answer:
In scientific endeavors, when one of the five senses is used to gather information, it constitutes making an observation. Observations can involve both qualitative and quantitative data, and they provide evidence that scientists use to form conclusions.
Explanation:
When scientists use one of their five senses to gather information, they are A. making an observation. Scientists usually perform observations by using one or more of their five senses to gain an understanding of the properties or behaviors of a substance or a system. These data can be qualitative (descriptive) or quantitative (consisting of numbers). For instance, seeing a plant growing (observation) and measuring its growth over weeks (data collection). From these observations, the scientist can infer conclusions based on the evidence collected. In brain studies, the activity in the brain during specific tasks is observed, which could be the basis for conclusions about brain functionality.
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