Answer
1. 1cm=10mm, 1kg=1000g and 12in=1 ft
2. 50mm=5cm
48 in =4ft
36ft=12 yd
2.5m=250cm
1000mL= 1 L
Explanation
if 1cm=10mm then 5cm=?
5×10=50mm
if 12 in =1ft then 48in=?
48/12 =4 ft
if 1m=100cm, then 2.5m=?
2.5×100= 250cm
and when know from capacity that 1000mL is equivalent to 1 liter.
____ dating uses the properties of atoms in rocks and other objects to find their ages. a. Comparative c. Approximate b. Absolute d. Relative Please select the best answer from the choices provided A B C D
Answer:
b. Absolute
Explanation:
Absolute dating is a method used by scientists to determine the age of objects by evaluating the properties of its atoms, it is also called chronological and calendar dating, since absolute refers to a certainity that the scientists can not warantee when it comes to how long has an object has bein on a certain place.
Absolute dating uses the decay properties of isotopes in rocks to find their exact ages. It depends on radiometric methods and half-lives of isotopes, unlike relative dating, which only arranges rocks in age order. Option b is correct.
The correct answer to the question is Absolute dating,' which utilizes the properties of atoms within rocks and other objects to accurately determine their ages. Absolute dating methods are based on radiometric dating, which involves measuring the rate of decay of unstable isotopes, such as uranium or argon, to estimate the precise age of rocks and fossils.
Radiometric dating relies on the concept of a half-life, which is defined as the time required for half of a sample of a radioactive isotope to decay into its daughter isotope. Using the known half-lives of various isotopes, scientists can calculate the age of a rock or fossil with precision. Unlike relative dating, which only provides a sequence or comparison of ages, absolute dating assigns a specific numerical age.
For instance, while relative dating can tell us that one layer of rock is older than another, absolute dating can establish that a rock is 150 million years old. This method is paramount in geology for constructing accurate timelines of Earth's history.
The amount of matter in an object is called _____.
gravity
mass
volume
weight
mass - hope this helps!!
The answer is Mass☺️.
How do ethical guidelines make science safer ?
Well, for one thing, they ensure that a scientist can't claim a certain result, which might be biased and thus inaccurate, because he or she is being paid by, say, big business interests. For another, they ensure that medicines or treatments can't be made available to the public without thorough testing, replication, and peer review.
Explanation:
ethical guidelines are made to be implemented together to make any type of ethical judgment.
ethical guidelines make science safer because
It provides restrictions to the scientist, they can't claim their results, which may be inaccurate or would cause any harm to the surroundings and society.As per the Ethical guidelines, researchers are allowed to follow certain rules while conducting out research, so that their work does not cause any harm to the environment and participants.What is the net ionic equation for Mg(OH)2 + HCl > MgCl2 + H2O?
Mg^2+ + 2Cl^- -> MgCl2
The net ionic equation for the reaction of magnesium hydroxide, Mg(OH)2, and hydrochloric acid, HCl, is: Mg(OH)2(s) + 2H+(aq) → Mg2+(aq) + 2H2O(l). It shows the chemical species directly involved in the reaction, excluding spectator ions.
Explanation:The net ionic equation for the reaction of magnesium hydroxide and hydrochloric acid is slightly different to total ionic equations, as it eliminates those ions which do not partake in the reaction - these are known as the 'spectator ions'. The reaction of magnesium hydroxide, Mg(OH)2 and hydrochloric acid, HCl can be outlined as follows:
Total Ionic Equation: Mg(OH)2(s) + 2H+(aq) + 2Cl-(aq) → Mg2+(aq) + 2Cl-(aq) + 2H2O(l)Net Ionic Equation: Mg(OH)2(s) + 2H+(aq) → Mg2+(aq) + 2H2O(l)In the net ionic equation, the spectator ion Cl- is removed. Net ionic equations therefore illustrate only the chemical species that are directly involved in the reaction process itself.
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Which cellular change in an organism could be inherited be the next generation?
In order for a cellular change to be inherited, this change must be present in the male gamete, or sperm or present in the female gamete, the egg or ovum. This is due to the fact that a baby is created from the fusion of an egg and sperm. Therefore, choice 2, the deletion of a single DNA base in a sperm cell of a trout, is the correct answer.
If we think about it logically, cellular changes in other parts of body should not affect the next generation. For example, if mom has skin cancer, it does not mean at all that the baby will have it as well.
How does the structure of a carbon atom enable it to form large molecules
Answer: Because of the property known as Catenation.
Explanation: Catenation is the property of making molecules by self linkage.
This is the property mostly exhibited by the carbon. Thus it is famous for creating large molecules or large chains of carbon and hydrogen atoms.
This property is also exhibited sulfur of the chalcogen family.
The structure of a carbon atom enables it to form large molecules as it can form four chemical bonds to the other atoms as well. It usually forms covalent bond by sharing of the electrons.
What is the percent concentration of a sodium fluoride solution made be dissolving 65.4 grams of sodium fluoride in 125.1 grams of water?
Answer:
34.33 %.
Explanation:
To calculate the mass percent or weight percent of a solution, you must divide the mass of the solute by the mass of the solution (both the solute and the solvent together) and then multiply by 100 to change it into percent.W% = [(W of solute NaF)/(W of solution)] x 100.
W of solute NaF = 65.4 g.
W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.
∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.
The percent concentration of the sodium fluoride solution is approximately [tex]\( 34.32 \% \)[/tex].
To find the percent concentration of the sodium fluoride solution, we first need to calculate the total mass of the solution, which is the sum of the mass of sodium fluoride [tex](\( \text{NaF} \))[/tex] and the mass of water [tex](\( \text{H}_2\text{O} \))[/tex].
Total mass of the solution [tex]\( = \text{mass of NaF} + \text{mass of water} \)[/tex]
Given:
Mass of sodium fluoride [tex](\( \text{NaF} \)) \( = 65.4 \) grams[/tex]
Mass of water [tex]\( = 125.1 \) grams[/tex]
[tex]Total mass of the solution \( = 65.4 \, \text{g} + 125.1 \, \text{g} = 190.5 \, \text{g} \)[/tex]
Next, to find the percent concentration of sodium fluoride in the solution, we'll use the following formula:
[tex]\[ \text{Percent concentration} = \frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 \][/tex]
where:
Mass of solute is the mass of sodium fluoride
Mass of solution is the total mass of the solution
Substituting the given values:
[tex]\[ \text{Percent concentration} = \frac{65.4 \, \text{g}}{190.5 \, \text{g}} \times 100 \][/tex]
[tex]\[ \text{Percent concentration} = \frac{65.4}{190.5} \times 100 \][/tex]
[tex]\[ \text{Percent concentration} = 0.3432 \times 100 \][/tex]
[tex]\[ \text{Percent concentration} \approx 34.32 \% \][/tex]
how do you calculate zone of inhibition?
In order to measure the zone of inhibition we measure the diameter of the zone of inhibition including the diameter of the disc.
Explanation:A Zone of Inhibition Test, also called a Kirby-Bauer Test, is a qualitative method used clinically to measure antibiotic resistance and industrially to test the ability of solids and textiles to inhibit microbial growth. The zone is measured by the diameter across the zone and you do not consider the disc at all. Zone is measured from edge to edge of the clear area , which means disc will be inside and included in the measurement.
A box of table salt contains 737 g of NaCl. How many moles of NaCl are present in the box?
The molecular weight of NaCl is 58.5 g/mol. 737 g/58.5 g/mol = 12.6 mol. So, there are 12.6 moles of NaCl in the box.
Taking into account the definition of molar mass, 12.61 moles are in 737 grams of NaCl.
But first, the molar mass of a given substance is a physical property defined as the mass of one mole of a substance, which can be an element or a compound.
In a compound the molar mass is equal to the sum of the weight or atomic mass of its atoms multiplied by its quantity; that is, the molar mass of the elements of the compound must be added multiplied by the times they appear.
In this case, the atomic mass of the elements of the compound are:
Na: 23 g/moleCl: 35.45 g/moleThen the atomic mass of the compound NaCl is:
NaCl= 23 g/mole + 35.45 g/mole
NaCl= 58.45 g/mole
Then you can apply the following rule of three: if by definition of molar mass 58.45 grams of the compound are contained in 1 mole, 737 grams are contained in how many moles?
[tex]amount of moles=\frac{737 gramsx1 mole}{58.45 grams}[/tex]
amount of moles= 12.61 moles
In summary, 12.61 moles are in 737 grams of NaCl.
Learn more:
brainly.com/question/15721168?referrer=searchResults brainly.com/question/15484208?referrer=searchResults brainly.com/question/14124542?referrer=searchResults brainly.com/question/2903329?referrer=searchResultsAs water is cooled its density increases until it reaches about _
as water is cooled it's density increases until about 4 c then it decreases
Answer:
As water is cooled its density increases 4 degrees Celsius is reached
Explanation:
Thus water being a solvent has various physical and chemical properties it expands as gs and contracts as icy layers until it reaches a freezing point by approx 9% of water density. Schooling of a substance causes water to slow down at a faster rate occupying a smaller rate as hot water is less dense than the room temperature as cold water is denser and will freeze at room temperature. Thus water has to condense to a certain point to produce the desired effects.Which is the basic cell of the nervous system
A neuron
B axon
C sodium
D dendrite
The basic cell is a neuron
The functional group for an aldehyde is
A. ( - COOH)
B. (- OH)
C. (- COH)
D. (-CO)
The functional group of aldehyde is - COH
This group is attached to another carbon chain giving the hydrocarbons that contain this functional group the general formula: R-COH
The functional group gives the aldehydes their chemical properties as it can be displaced during reactions to form new compounds.
Answer:
- COH
Explanation:
How do I find the volume of a gas at stp if it’s volume is 80.0mL at 109kPa and -12.5 degrees Celsius
all i really know is that STP (standard temperature and pressure) represents conventional conditions established by IUPAC with T = 273.15 K, P = 1 atm . Now putting these values of temperature and pressure at STP, we can calculate easily volume occupied by 1 mol of gas and which comes out to be 22.4 L. hope this helps
Answer:
Volume of the gas is 90.2 ml
Explanation:
Given:
Initial volume, V1 = 80.0 ml = 0.080 L
Initial pressure, P1 = 109 kPa = 1.076 atm ( 1 kPa = 0.00987 atm)
Initial temperature, T1 = -12.5 C = -12.5 + 273 K = 260.5 K
Under STP conditions i.e. standard temperature and pressure we have:
Pressure, P2 = 1 atm
Temperature, T2 = 273 K
Formula:
Based on the ideal gas relation we have:
[tex]\frac{P1V1}{T1} =\frac{P2V2}{T2} \\\\V2 = \frac{P1V1}{T1} (\frac{T2}{P2} ) = \frac{1.076*0.080}{0.260.5} (\frac{273}{1} )=0.0902 L[/tex]
Can someone help me with this?
The answer would have to be “move fast and far apart.”
I really hope this helps you.
What does the ideal gas law describe
the law that the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.
Ideal Gas Law has been described below.
What is Ideal Gas Law ?According to Ideal gas law , the product of Pressure and Volume for 1 mole of an ideal gas is equal to the product of Temperature and Universal Gas Constant R
The equation is represented by
PV = nRT
It is valid only for ideal gases and no gas is ideal, At STP all the gases are considered to behave ideally.
It is a combination of the empirical Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law.
It relates the macroscopic properties of gases.
It has wide applications in the processes where gas is involved.
To know more about Ideal Gas Law
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An atom with an equal number of electrons and protons has no ______.
no charge
this is because protons have a charge of 1+ and electrons have a charge of 1- so if there is an equal number of them, their charges cancel each other out and make the atom have a charge of 0, which means no charge
Answer: An atom with an equal number of electrons and protons has no charge
Explanation: The charge of an atom comes from the electrons and protons present. Electrons have a charge of 1- and protons have a charge of 1+. When the number of electrons and of protons are equal, an atom has no overall charge.
Photochemical smog results from the interaction of pollutants in the presence of
A. Water vapor
B. Oxygen
C. Sunlight
D. Rainfall
Water vapor in the air
Answer:
The answer is water vapor.
Explanation:
gas mixture composition of 78.0% Nitrogen, 17.0% Oxygen, % Argon,% Carbon Dioxide. Find the mass of Nitrogen?
Best Answer: Total number of moles n = PV/RT = (12.5atm x 10L)/(0.082 x 298K) = 5.1154 mole
30g of oxygen = 30g/32g/mol = 0.94 mole. Also 30g of nitrogen = 30g/28g/mole = 1.07 moles.
Let the number of moles of CO2 be = c,
0.94 + 1.07 + c = 5.1154. Hence c = 3.105 mole = number of moles of CO2
Mass of CO2 = 3.105 moles x 44g/mole = 136.62g ~ 137g
A newspaper article states that plant cells are easily identified by the presence of large vacuoles. Which of these evaluations is correct? The article is correct because vacuoles are only found in plant cells. The article is correct because although vacuoles are found in both plant and animal cells, they are larger in plant cells than in animal cells. The article is flawed because vacuoles are found in both plant and animal cells. The article is flawed because although vacuoles are found in both plant and animal cells, they are larger in animal cells than in plant cells.
//hey again//
The article is correct because although vacuoles are found in both plant and animal cells, they are larger in plant cells than in animal cells.
hope this helps uwu
~i love your profile picture~
Vacuoles are found in both plant and animal cells, but they are larger in plant cells than in animal cells.
Explanation:The article is correct because although vacuoles are found in both plant and animal cells, they are larger in plant cells than in animal cells.
Plant cells have a large central vacuole that holds a mixture of water, nutrients, and wastes. A plant cell's vacuole can make up 90% of the cell's volume. In animal cells, vacuoles are much smaller.
In addition to containing most of the organelles found in animal cells, plant cells also have a cell wall, a large central vacuole, and plastids. These three features are not found in animal cells.
Which of the following tasks for an explosion crime scene would you most likely assign to your most experienced, skilled team members? Photographing the location where the bomb exploded Collecting residue samples from the scene Assessing whether the explosion was a result of a criminal All of the above are equally as challenging.
Answer:
Collecting residue samples.
Explanation:
All the other given options are equally important on the exploration of a bomb aftermath.
The most important task is the collection of residue samples since it needs highly skilled personel to collect accurate samples for later on analysis.
Identification of meaningful collection areas is a technical skill that requires the most experienced team memebers.
Answer: Collecting residue samples from the scene.
Explanation:
Collection of the residues after the explosion will be the most important task that is required to be done immediately this is because of the fact that the explosive residues at the site of the crater may consists of residues which may contain both volatile and non-volatile substances which are likely to be blown away soon after explosion. Thus if not collected in proper time the type of explosive used for explosion will remain undetected.
A pair of ice tongs is a double:
first-class lever
second-class lever
third-class lever
Answer:
second class
Explanation:
Select all of the following choices that would be a nonconducting substance or solution...
(All dissolved in water)
-sucrose C12H22O11
-CaCl2
-BeF2
-BaF2
-distilled water
*pick more than one*
Answer: Options A and E
Explanation: since A is non electrolyte , doesn't form any ions in aqueous solution. Hence non conducting and distilled water is pure without any ions and has only neutral water molecules. Hence it is non conducting substance.
And remaining all are ionic compounds and gives ions in aqueous solution and conduct the electricity. Hence they all acts as conductors.
Answer:
sucrose C12H22O11 and distilled water
Scientists study an ecosystem devastated by drought and observe the interactions of organisms in relation to food, light, water and mates. Which hypothesis statement relates to the investigation?
a If the drought continues to increase, then competition will decrease.
b If available resources decrease, then competition will increase.
c If available resources remain constant, then competition will decrease.
d If available resources increase, then competition will increase.
The correct answer is - b. If available resources decrease, then competition will increase.
All living organisms in an ecosystem are specialized in accordance to the living conditions and the food sources available. If a given ecosystem experiences prolonged drought, than the resources will decrease. With a decrease in resources, the living organisms will find themselves in a situation of scarcity. That will lead to a much increased competition, with both organisms of different species, and members of the same species. That will most likely lead to a situation where only the fittest will survive, while the weaker members of the species will probably die in that period of prolonged drought as they will not be able to get the resources they need to survive.
Answer:
B because animals would fight over food and water more to survive
Explanation:
What animals are listed in the picture?
starfish , squid , sea turtle are the only ones i know
4 Questions:
How many moles of chlorine are present in 3 moles of MgCI2?
6, 3, 5, or 4?
How many moles of H20 are needed to produce 1 mole of 02 in the following equation? 2H20->2H2+102 (not 102 it’s 1 singlet oxygen)
1, 2, 3, or 4?
How many moles of hydrogen atoms are present in 1 mole of H2 gas?
3, 2, 1, or 4?
How many atoms or molecules are in a mole?
1. 1
2. An 6.02 x 10
3. 2
4. 6.02 x 10^23
In a sample of MgCl2, there are 6 moles of chlorine for every 3 moles of MgCl2. Two moles of H2O are required to produce 1 mole of O2. One mole of H2 gas contains 2 moles of hydrogen atoms, and there are 6.02 x 10^23 atoms or molecules in a mole.
Explanation:To answer your questions about moles and stoichiometry:
There are 6 moles of chlorine present in 3 moles of MgCl2. Each formula unit of MgCl2 contains two chlorine atoms.When considering the balanced chemical equation 2H2O → 2H2 + 1O2, you need 2 moles of H2O to produce 1 mole of O2.There are 2 moles of hydrogen atoms present in 1 mole of H2 gas since each molecule of H2 contains two hydrogen atoms.1 mole of any substance contains 6.02 x 1023 atoms or molecules, which is Avogadro's number.What does the rate law use to determine the rate of a reaction
The substances that influence the rate of reaction are usually one or more of the reactants, but can occasionally include products. ... The rate law is experimentally determined and can be used to predict the relationship between the rate of a reaction and the concentrations of reactants.
The rate law uses the molar concentrations of reactants to determine the reaction rate.
What is a catalyst?A catalyst is a substance that allows the chemical reaction to occur at a faster rate or under different conditions (e.g. at a lower temperature) without being affected by the reaction.
The substances that influence the rate of reaction are usually one or more of the reactants, but can occasionally include products.
The rate law is experimentally determined and can be used to predict the relationship between the rate of a reaction and the concentrations of reactants.
The rate law uses the molar concentrations of reactants to determine the reaction rate.
Typically, increased concentrations of reactants increase the speed of the reaction, because there are more molecules colliding and reacting with each other.
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An atom has 24 protons,20 electrons, and 28 neutrons. What type of atom is it?
It should be an Ion. Sorry.
The atom with 24 protons, 20 electrons, and 28 neutrons is a chromium ion with a +4 charge and a mass number of 52.
An atom with 24 protons is an atom of the element chromium (Cr), which has an atomic number of 24. The atomic number represents the number of protons in the nucleus and defines the type of element. In a neutral atom, the number of protons equals the number of electrons, but this atom has 20 electrons, which means it has a +4 charge, making it a chromium ion. Furthermore, it has 28 neutrons, and the mass number of an atom is the sum of its protons and neutrons. This gives the chromium atom in question a mass number of 52 (24 protons + 28 neutrons).
Which scientist began organizing elements into the periodic table?
A. Alfred wegener
B. Sir Francis bacon
C. Dmitri mendeleev
D. Sir issac Newton
Mendeleev i guess. The answer is C
Answer: C. Dmitri Mendeleev
Explanation: Dmitri Mendeleev was the first scientist who initiated the arrangement of elements in the regular pattern which is known as the Periodic table of Elements.
He tried to arrange these elements on the basis of the chemical properties and on the basis of their atomic number.
Atomic number was considered as the basis of the periodic table as it is the most basic and essential property of the elements.
A solution was prepared by dissolving 5.76 g of KCl •MgCl2
Final answer:
To find the chlorine concentration in the solution, the moles of chlorine from CaCl₂ and MgCl₂ are calculated and summed. The total chlorine mass is then determined and divided by the solution volume in liters, resulting in a concentration of 18.45 g/L.
Explanation:
To calculate the concentration of chlorine in the solution prepared by mixing 2g of CaCl₂, 2g of MgCl₂, and 3g of MnO₂ in a total volume of 150 mL, first, we need to determine the amount of chlorine present in each compound. Calcium chloride (CaCl₂) and magnesium chloride (MgCl₂) each have two moles of chlorine per mole of compound, while manganese dioxide (MnO₂) has no chlorine.
Molar mass of CaCl₂ = 110.98 g/mol
Molar mass of MgCl₂ = 95.21 g/mol
Amount of chlorine from CaCl₂:
• (2 g CaCl₂) / (110.98 g/mol) = 0.01802 mol CaCl₂ × 2 mol Cl⁻/mol = 0.03604 mol Cl⁻
Amount of chlorine from MgCl₂:
• (2 g MgCl₂) / (95.21 g/mol) = 0.02101 mol MgCl₂ × 2 mol Cl⁻/mol = 0.04202 mol Cl⁻
Total moles of Cl⁻ = 0.03604 mol + 0.04202 mol = 0.07806 mol
Finally, to find the concentration of chlorine in g/L:
• (0.07806 mol Cl⁻) × (35.45 g/mol) = 2.767 g of Cl⁻
• Since the total volume is 150 mL, or 0.15 L, the concentration is (2.767 g / 0.15 L) = 18.45 g/L.
• Define and describe in detail (and in your own words) ultrasound and infrasound
• Describe how ultrasound and infrasound are used in specific industrial applications and provide detailed examples.
Answer:
Human ears can hear sound waves that vibrate in the range from about 20 times a second (a deep rumbling noise) to about 20,000 times a second (a high-pitched whistling). (Children can generally hear higher-pitched sounds than their parents, because our ability to hear high frequencies gets worse as we get older.) Speaking more scientifically, we could say that the sounds we can perceive have a frequency ranging from 20–20,000 hertz (Hz). A hertz is a measurement of how often something vibrates and 1 Hz is equal to one vibration each second. The human voice makes sounds ranging from a few hundred hertz to a few thousand hertz.
Suppose you could somehow hit a drum-skin so often that it vibrated more than 20,000 times per second. You might be able to see the skin vibrating (just), but you certainly couldn't hear it. No matter how hard you hit the drum, you wouldn't hear a sound. The drum would still be transmitting sound waves, but your ears wouldn't be able to recognize them. Bats, dogs, dolphins, and moths might well hear them, however. Sounds this like, with frequencies beyond the range of human hearing, are examples of ultrasound.
Infrasonics, vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear—i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations that complete one cycle in 100 seconds or longer.