What physical properties do dry ice and water ice have in common?
Dry ice and water ice are both forms of solid matter, thus, they share similar properties such as having a fixed shape and being incompressible. One of their notable shared attributes is their ability to undergo the process of sublimation.
Explanation:Both dry ice (solid carbon dioxide, CO₂) and water ice are forms of solid matter, which means they are composed of atoms, molecules or ions and their particles are closely packed together. As a result, they share some physical properties. For instance, both dry ice and water ice have a fixed shape and are generally incompressible.
Both substances can also undergo sublimation which is a process where a substance transitions directly from a solid to a gas, bypassing the liquid state. For dry ice, it sublimes at room temperature and pressure, while water ice requires temperatures below its melting point to sublime. This process may be visible as mist or frost in the air.
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Red blood cells contain an enzyme called carbonic anhydrase, which catalyzes the reversible reaction whereby carbon dioxide and water are used to form carbonic acid.
If the internal energy of the products of a reaction is lower than the internal energy of the reactants, what is the sign of δe for the reaction?
If the internal energy of the products in a reaction is lower than the internal energy of the reactants, this means the reaction is an exothermic reaction and the sign of δe for the reaction is positive.
What is Internal energy?Internal energy is the property or state function which defines the energy of a substance in the absence of effects due to capillarity and the external electric, magnetic, and other fields.
In this reaction, the internal energy of products is lower than the internal energy of the reactants because the bonds in the products are stronger than those in the reactants, as a result the reaction releases more energy than it consumes. Therefore, the reaction is an example of exothermic reaction.
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Astrology is a pseudoscience because:
A. it needs to be tested more before it can be a real science.
B. it claims to be, but is not, a science.
C. it is a controversial science.
D. it is a new and unproven science.
Final answer:
Astrology is a pseudoscience because it claims to be scientific but does not follow the scientific method, lacking falsifiable predictions and empirical verification, distinguishing it from legitimate sciences like astronomy.
Explanation:
Astrology is considered a pseudoscience because it is a belief system or practice that is often claimed to be scientific but does not adhere to a valid scientific methodology. It lacks the provision of falsifiable predictions or hypotheses, which is a core principle in the scientific method. Astrology, the practice of using celestial bodies to make predictions about human behaviors, positions itself as having an astronomical foundation, yet it does not engage in empirical and statistical methods that are characteristic of actual sciences like astronomy.
The correct answer to why astrology is a pseudoscience is B. it claims to be, but is not, a science. This is because astrology's methods do not incorporate the systematic observations, carefully-controlled experiments, and rigorous peer review that are the hallmarks of true scientific practice. While the movements and positions of celestial bodies (the subject of astronomy) can be precisely measured and predictions tested against observable outcomes, astrology (the supposed influence of celestial bodies on human life) does not operate within such testable frameworks.
Why do your feet feel cooler on a tile floor than on a warm rug?
The tile is a poor conductor.
The rug is a good conductor.
The tile is a better insulator than the rug.
The rug is a better insulator than the tile.
Answer:
Option d
Explanation:
The question is to find the reason why our feet feel cooler on a tile floor than on a warm rug.
The reason is
i) the tile is a better heat conductor and it moves our body heat faster away from our skin.
ii) The rug is a good insulator and hence it slows down the flow of heat from our skin of touch and hence we feel warmer
So out of the four options
option d is right.
The rug is a better insulator than the tile.
A __________ is a mound or ridge of sand most often found on a coastline or in the desert.
butte
delta
dune
glacier
Explain how chemical reactions apply to law of conservation of matter
The Law of Conservation of Matter applies to chemical reactions by stating that the amount and type of atoms in the reactants must equal the amount and type in the products. This is due to the fact that matter cannot be created or destroyed in an isolated system. For example, the reaction of hydrogen and oxygen to form water shows this conservation.
Explanation:The Law of Conservation of Matter states that matter cannot be created or destroyed in an isolated system. In the context of chemical reactions, this means that the amount and type of atoms before the reaction (in the reactants) must be equal to the amount and type of atoms after the reaction (in the products).
For example, in the reaction of hydrogen and oxygen to form water: 2H2 + O2 -> 2H2O, there are 4 hydrogen atoms and 2 oxygen atoms both before and after the reaction. Thus, the total mass of the reactants equals the total mass of the products, illustrating the Law of Conservation of Matter.
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If 50.75 g of a gas occupies 10.0 l at stp, 129.3 g of the gas will occupy __________ l at stp.
Answer: 25.5 L
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
We are given:
50.75 g of a gas occupies = 10.0 L at STP
Thus 129.3 g of a gas occupies =[tex]\frac{10}{50.75}\times 129.3=25.5L[/tex] at STP
Thus 129.3 g of gas will occupy 25.5 L at STP.
what is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?
Answer:
Theoretical yield of H2 = 10.0 g
Explanation:
Given:
Moles of Zn added = 5.00
To determine:
The theoretical yield of H2 gas
Calculation:
The balanced reaction between Zn and HCl is as shown below:
[tex]Zn + 2HCl \rightarrow ZnCl2 + H2[/tex]
Based on the reaction stoichiometry:
Since HCl is in excess, the limiting reagent is Zn. Thus,
1 mole of Zn will produce 1 mole of H2
Accordingly, 5 moles of Zn will produce 5 moles of H2
Molar mass of H2 = 2 g/mol
Mass of H2 produced = [tex]Moles * Molar\ mass = 5.00 mol*2 g/mol = 10.0 g[/tex]
Which of the answer choices is correctly defined as the materials that enter into a chemical reaction and are changed by it?
solutes
reactants
products
coefficients
When 0.1523 g of liquid pentane (c_5 5 h_{12} 12 ) combusts in a bomb calorimeter, the temperature rises from 23.7^{\circ} ∘ c to 29.8 ^{\circ} ∘
c. what is \deltaδu_{rxn} rxn for the reaction in kj/mol pentane? the heat capacity of the bomb calorimeter is 5.23 kj/^{\circ} ∘
c?
A solution conducts an electric current more easily when the solution contains more ions. An acidic solution conducts an electric current very easily. What type of acid is in this solution?
a weak acid because it dissociates completely
a strong acid because it dissociates completely
a weak acid because it dissociates partially
a strong acid because it dissociates partially
Both renewable and nonrenewable resources are used within our society. How do the uses of nonrenewable resources compare to the uses of renewable resources?
a.
Nonrenewable resources have more applications than renewable resources.
b.
Certain types of renewable energy can be used for as many applications as certain types of nonrenewable resources.
c.
There are more sources of nonrenewable energy than renewable energy.
d.
Nonrenewable resources have fewer applications than renewable resources.
Renewable sources are which can be gained again and again from nature
for example : sun energy or wind energy
non renewable: these once consumed cannot be regained
example : fossil fuels
Now both can be used for many kinds of applications however the resources so we can say that Certain types of renewable energy can be used for as many applications as certain types of nonrenewable resources
Answer:
A.
Explanation:
A population expert makes a graph to show the future rates of population growth in various countries. Which is necessary a source of error for him?
Final answer:
The unpredictability of various factors impacting population changes poses challenges in accurate projections made by population experts.
Explanation:
One necessary source of error for a population expert making future population growth graphs is the unpredictability of factors affecting population changes. These factors include birth rates, death rates, migration, and resource limits impacting population growth. Additionally, mitigation measures undertaken by countries or unforeseen events altering societal dynamics can lead to inaccuracies in long-range population projections essential for planning purposes. Population forecasts attempt to estimate growth rates, but unpredictable changes in fertility, mortality, and migration rates can pose challenges in accurate projections.
Without doing any calculations, list the elements in c2h4o2 in order of decreasing mass percent composition.
What are the general characteristics of substances chemists use to separate mixtures into individual substances?
Chemists use substances with distinct physical and chemical properties to separate mixtures into individual substances. These can be pure substances (a single element or compound) or mixtures containing multiple substances. The specific composition of each substance or mixture determines its properties.
Explanation:The substances that chemists use to separate mixtures into individual substances generally have distinct physical and chemical properties. Each compound has a specific composition and demonstrates definitive properties that make them unique from other compounds. These properties include elements such as physical properties like hardness and boiling point, and chemical properties like flammability and acidity.
Substances, in the form of elements and compounds, can be combined in many ways to form different mixtures. A mixture, which is commonly encountered in nature, contains two or more substances physically combined. The relative composition of a mixture plays a key role in determining its properties.
Pure substances consist of only one type of element or compound, while mixtures contain multiple. Pure substances include elements that cannot be further broken down by chemical changes. The known elements are just over 100, with around 90 naturally occurring on earth.
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At which stage(s) in meiosis is DNA condensed into chromosomes? prophase I only, prophase I and II, metaphase I and II, metaphase II only
Which of these elements has two electrons in its outer P orbitals?
Helium
Barium
Nitrogen
Silicon
Sulfur
Why are radioactive isotopes used in studies of metabolic pathways?
The radioactive isotopes used in studies of metabolic pathways, this is because their location of quantity can be experimentally determined because of their radioactivity.
what is the meaning radioactive substance ?A substance is called radioactive element if it changes its atomic number or atomic weight by releasing energy, this energy present as either Alpha, beta, or gamma forms of radiation.
The alpha is a Helium nucleus, a beta particle is an electron where as gamma is high energy electromagnetic radiation, the half life can be defined as the time required by a radioactive substance to disintegrate into a different substance.
If a radioactive element has a one-hour half-life, it means that half of the element will be decayed and the remaining would decay within another hour.
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How does the percent of an acid in a water solution affects the ph of the solution?
Estimate the volume, v, of one sodium atom (na) using its metallic radius of 186 pm. express your answer with the appropriate units.
The volume of one sodium atom with a metallic radius of 186 pm is [tex]\boxed{26965110.857\;{\text{p}}{{\text{m}}^3}}[/tex]
Further explanation:
The smallest particle that is the building block of matter is known as an atom. Most of the space in an atom is empty and its mass is concentrated inside a small region called the nucleus.
Protons, electrons, and neutrons are the three subatomic particles that are present in the atom. Electrons revolve around the nucleus in definite orbits.
The measure of the size of the atoms is known as its atomic radius or atomic size and is defined as the distance from the nucleus to the outermost shell that contains the electrons.
Types of atomic radius:
1. Covalent radius
Half of the internuclear separation between the nuclei of the two single-bonded atoms of the same species is termed as a covalent radius.
2. Van der Waals radius
It is half of the distance between two unbonded atoms when these have balanced electrostatic forces of attraction.
3. Metallic radius
Half of the distance between the nuclei of two atoms in a crystal is called a metallic radius.
Consider the sodium atoms to be spherical. The formula to calculate the volume of spherical sodium atoms is as follows:
[tex]{\text{V}} = \frac{4}{3}{\pi }}{{\text{r}}^3}[/tex] …… (1)
Here,
V is the volume of sodium atoms.
r is the radius of the sodium atom.
The value of r is 186 pm.
Substitute this value in equation (1).
[tex]\begin{aligned}{\text{V}}&=\left( {\frac{4}{3}}\right) \times \left( {\frac{{22}}{7}} \right) \times {\left( {{\text{186 pm}}}\right)^3} \\&=\left( {\frac{{88}}{{21}}} \right) \times 6434856\;{\text{p}}{{\text{m}}^3} \\&=26965110.857\;{\text{p}}{{\text{m}}^3} \\ \end{aligned}[/tex]
Therefore, the volume of one sodium atom with a metallic radius of 186 pm is [tex]\boxed{26965110.857\;{\text{p}}{{\text{m}}^3}}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Solid State
Keywords: volume, sodium atom, 186 pm, radius, metallic radius, atomic radius, 26965110.857 pm3, atomic radius, covalent radius, van der Waals radius.
What would be the mass of an unknown liquid if 89.2 ml had a density of 75.2 g/ml?
Water vapor turning to frost is an example of __________. question 6 options: condensation deposition evaporation sublimation save
The correct answer is sublimation.
help this helps :)
How to find the valence electrons on a periodic table + energy levels?
Identify the variable that is manipulated in an experiment.
Independent variable
Dependent variable
Control
Codependent variable
the answer is (#1) independent variable.
A parent who is convinced that children have rights that ought not to be interfered with by adults is most likely:
Which of these expressions are correct variations of the combined gas law?
Answer:
Both p2=p1(t2/t1)(v1/v2) and p1v1t2=p2v2t1
Explanation:
In a combustion reaction, one of the reactants is _____. hydrogen a metal nitrogen oxygen
Answer:
oxygen
Explanation:
Always needed to combust
The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element?
Atom
Atomic Number
Mass Number
A
100
258
B
101
258
C
101
260
D
102
259
A and B
C and D
B and D
B and C
An iron fence is left unpainted, and it reacts to the oxygen in the air, forming rust. the formation of rust is an oxidation-reduction reaction, but it also is an example of a?
Answer: synthesis
Explanation:the answer given earlier does have a comment on it correcting but I missed that the first time I visited this question.