The softest and hardest minerals are:
Rocks are made up of minerals. The hardest mineral is diamond. The softest mineral is talc, which is ground up to make talcum powder.
Judging by the electron domain geometry, which type of hybrid orbitals does this molecule have? s sp sp2 sp3
Scientists are testing a new drug, which they think might allow people to memorize large amounts of information. Group A is taking a sugar pill. Group B is taking the new drug. Both groups are 25–35 years old and are not taking any other medicine. After a month, both groups will be given a memorization test, and scientists will compare each group’s ability to memorize new information. Which choice is the controlled variable (constant) in the experiment? A. the sugar pill B. the new drug C. the ability to memorize D. the age of the test subjects
which structures function mainly in transport
C and D structures function mainly in transport. Hence, option D is correct.
What structures function in active transport?The membrane structures that function in active transport eg. integral proteins.
A major role of the plasma membrane is transporting substances into and out of the cell.
The plasma membrane is selectively permeable, allowing only certain substances to pass through.
Proteins embedded within the plasma membrane helps to move hydrophilic, polar molecules into the cell.
Hence, option D is correct.
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Select the correct chronological order for the discoveries by the following scientists
a)Thompson. Dalton. Rutherford, Bohr
b)Dalton, Thompson, Rutherford, Bohr
c)Bohr, Rutherford, Dalton, Thompson
d)Rutherford, Dalton, Thompson, Bohr
The correct chronological order for the discoveries by the scientists are Dalton, Thompson, Rutherford, Bohr. Therefore, option B is correct.
What are discoveries ?The act of discovering something, whether it be data, a location, or an item, particularly when doing so for the first time: the discovery of electricity.
Leonardo was a prolific scientist. a travel or exploration voyage. An investigation into a murder was opened when a corpse was found in the brush.
While Discovery aids in identifying the adjustments and enhancements that are required, it also aids in streamlining and ranking those changes, helping you choose which requests are most crucial and how to accommodate everyone's requirements.
In order to make a discovery, one must present observational data and make an effort to form a preliminary knowledge of a phenomenon.
Thus, option B is correct.
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Sulfur has fewer valence electrons than chlorine. True or False
Answer:
True
Explanation:
Valence electron:
No. of electrons present in the outermost shell of any atom is called valence electrons. Valence electrons determines the chemical properties of element.
Atomic no. of S = 16
Electronic configuration of S = [tex]1s^22s^22p^63s^23p^4[/tex]
Energy shell (n = 3) is the outermost shell
Valence electrons = 6
Atomic no. of Cl = 17
Electronic configuration of S = [tex]1s^22s^22p^63s^23p^5[/tex]
Energy shell (n = 3) is the outermost shell
Valence electrons = 7
So, sulfur has 6 valence electrons and Cl has 7 valence electrons.
The statement 'Sulfur has fewer valence electrons than chlorine.' is true.
what does the part of the equation to the left of the arrow represent in a chemical formula
What can affect the properties of a substance?
only the types of atoms
only the arrangement of atoms
the arrangement and types of atoms
neither the arrangement nor the types of atoms
How many oxygen atoms are in the product H2CO3 H2O+CO2
The products H₂O and CO₂ from the decomposition of H₂CO₃ contain a total of 3 oxygen atoms, with one from the water and two from the carbon dioxide.
The question How many oxygen atoms are in the product H₂CO₃ H₂O+CO₂is a chemistry problem that involves counting the number of oxygen atoms in the products of a chemical reaction. The compound H₂CO₃ decomposes into H₂O (water) and CO₂ (carbon dioxide). To determine the number of oxygen atoms, we look at the products H₂O and CO₂. Water has one oxygen atom, and carbon dioxide has two oxygen atoms. Therefore, each molecule of H₂O has one oxygen, and each molecule of CO₂ has two oxygens.
We sum the number of oxygen atoms from both products: 1 oxygen from H₂O and 2 oxygens from CO₂, giving us a total of 3 oxygen atoms in the products of the reaction.
Which of the following elements has the largest atomic radius?
Potassium
Calcium
Cobalt
Nickel
Potassium has the largest atomic radius.
Explanation:Using periodic table trends one can easily compare the atomic radii of elements. The trends in atomic radii are as follow,
Trends in Groups:
Moving from top to bottom along the groups the atomic radii increases because as you move from top to bottom the number of shells increases hence, the distance of valence electrons from nucleus also increases and therefore, atomic radius increases.
Trends is Periods:
Moving from left to right along the periods the atomic radii decreases. This is because the number of protons and electrons increases but the the valence shell remain the same hence, causing more nuclear charge and more attraction between the valence electrons and nucleus.
Result:Potassium, Calcium, Cobalt and Nickle all are present in same period. Potassium present at the extreme left will have greater atomic radii of 0.227 nm while Co and Ni at the middle of period will have atomic radii of 0.125 nm each. While, the atomic radius of Calcium next to K is 0.197 nm.
Potassium has the largest atomic radius because the atomic radius generally increases as you move down on the periodic table, and Potassium is highest in the given options.
Explanation:The atomic radius generally increases as you move down a group in the periodic table because as you go down a group, an additional electron shell is added, increasing the distance between the nucleus and the outermost electron shell. Of the elements listed: Potassium, Calcium, Cobalt and Nickel, Potassium is highest in Group 1 (also known as Alkali metals), and thus it has the largest atomic radius.
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HELP ME NOW ASAP
Now, find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide for a solution at a pH = 11. Then divide the H+ concentration by the OH– concentration. Record these concentrations and ratio in Table C.
What is the concentration of H+ ions at a pH = 11?
mol/L
What is the concentration of OH– ions at a pH = 11?
mol/L
What is the ratio of H+ ions to OH– ions at a pH = 11?
:1, OR 1:
Answer:0.00000000001
0.001
0.00000001
100,000,000
Explanation:i am big brain
Answer:
0.00000000001
0.001
0.00000001:100,000,000
Explanation:
i just did it on edge
HELP PLEASE, I GIVE 50 POINTS!!!!!!
How is the electronegativity difference used in determining the type of bond that occurs between two atoms? (SELECT ALL THAT APPLY)
a) If the difference is between 0.4 and 1.7, it is polar covalent.
b) If the difference is greater than 1.7, it is mostly ionic.
c) If the difference is zero, the bond is considered nonpolar covalent.
d) If the difference is less than 0.4, it is mostly covalent.
e) If the difference is zero, the bond is considered mostly polar.
f) If the difference is greater than 1.7, it is polar covalent.
g) If the difference is between 0.4 and 1.7, it is nonpolar covalent.
h) If the difference is less than 0.4, it is mostly ionic.
PLEASE HELP ASAP
Complete this sentence. The electrical conductivity of a sample will ____________ when the size of the sample increases.
decrease
stay the same
increase
be unable to be determined
Answer:
It will stay the same
Explanation:
I took the test and got a 100%
what is sinking cold air and rising warm air?
Describe two ways that carbon can get from seashells to the atmosphere
Answer: Two different ways carbon can get from shells to the environment is through limestone, lithosphere, spring of gushing lava, + barometrical CO2. The subsequent method to arrive would be through the maritime CO2, marine creatures + plants, silt, flammable gas, power plants, and afterward environmental CO2.
Explanation:
Read the list of common household substances. Antacid, orange juice, toothpaste, yogurt Which of these substances are likely to have a sour taste? A.Antacid, yogurt B.Antacid, toothpaste C.Orange juice, yogurt D.Orange juice, toothpaste
Answer : The correct options is, (C) Orange juice, yogurt.
Explanation :
Acid : It is a substance that has ability of donating proton or hydrogen ion, [tex]H^+[/tex].
The properties of an acid are :
Acids are sour in taste.The texture of an acid solution is sticky.It changes the color of the litmus paper to red.It react with a metal to give compound and hydrogen gas.Base : It is a substance that has ability of donating hydroxide ion, [tex]OH^-[/tex].
The properties of an base are :
Base are bitter in taste.The texture of an base solution is slippery.It changes the color of the litmus paper to blue.It does not react with a metal.As we know that,
Antacid : It is a base that is used for the neutralization of stomach acidity. So, it is bitter in taste.
Orange juice : It is an acid in which citrus acid present in it. So, it is sour in taste.
Toothpaste : It is a base that is used for cleaning teeth. So, it is bitter in taste.
Yogurt : It is an acid in which lactic acid present in it. So, it is sour in taste.
Hence, the substance likely to have a sour taste are orange juice, yogurt.
In which of the following are the symbol and name for the ion given correctly
Answer:
This question is incomplete but the completed question is below
In which of the following are the symbol and name for the ion given correctly?
a. Fe2+: ferrous ion; Fe3+: ferric ion
b. Sn2+: stannic ion; Sn4+: stannous ion
c. Co2+: cobalt(II) ion; Co3+: cobaltous ion
d. Pb2+: lead ion; Pb4+: lead(IV) ion
The correct option is a
Explanation:
In this question, the knowledge of ion naming is been tested. Below, the ions and there correct names will be presented
Pb2+ is lead (II) ion
Pb4+ is lead (IV) ion
Co2+ is cobalt (II) ion and it is also called cobaltous ion
Co3+ is cobalt (III) ion
Sn2+ is tin (II) ion and it is also called stannous ion
Sn4+ is tin (IV) ion and it is also called stannic ion
Fe2+ is iron (II) ion and it is also called ferrous ion
Fe3+ is iron (III) ion and it is also called ferric ion
From the above, we can deduce that option a is the one that has it's symbol correctly attached to it's name
what is the percent yield of NaCl if 31.0 g of CuCl reacts with excess NaNo3 to produce 21.2 g of NaCl
Final answer:
To calculate the percent yield of NaCl, one would use the formula of (Actual Yield / Theoretical Yield) × 100%. The percent yield of NaCl is approximately 57.96%.
Explanation:
To find the percent yield of NaCl, we first need to determine the theoretical yield of NaCl, which is the maximum amount that could be produced according to the balanced chemical equation.
The balanced chemical equation for the reaction between CuCl and NaNO3 to produce NaCl is:
[tex]\[ CuCl + 2NaNO_3 \rightarrow 2NaCl + Cu(NO_3)_2 \][/tex]
From the equation, we can see that 1 mole of CuCl produces 2 moles of NaCl.
1. Calculate the number of moles of CuCl used:
[tex]\[ \text{Molar mass of CuCl} = 63.5 + 35.5 = 99 \, \text{g/mol} \][/tex]
[tex]\[ \text{Number of moles of CuCl} = \frac{31.0 \, \text{g}}{99 \, \text{g/mol}} = 0.313 \, \text{mol} \][/tex]
2. Since 1 mole of CuCl produces 2 moles of NaCl, calculate the number of moles of NaCl produced:
[tex]\[ \text{Number of moles of NaCl} = 2 \times 0.313 \, \text{mol} = 0.626 \, \text{mol} \][/tex]
3. Calculate the theoretical yield of NaCl in grams:
[tex]\[ \text{Theoretical yield of NaCl} = \text{Number of moles} \times \text{Molar mass of NaCl} \][/tex]
[tex]\[ \text{Molar mass of NaCl} = 23 + 35.5 = 58.5 \, \text{g/mol} \][/tex]
[tex]\[ \text{Theoretical yield of NaCl} = 0.626 \, \text{mol} \times 58.5 \, \text{g/mol} = 36.591 \, \text{g} \][/tex]
Now that we have the theoretical yield and the actual yield (21.2 g), we can calculate the percent yield using the formula:
[tex]\[ \text{Percent yield} = \frac{\text{Actual yield}}{\text{Theoretical yield}} \times 100\% \][/tex]
[tex]\[ \text{Percent yield} = \frac{21.2 \, \text{g}}{36.591 \, \text{g}} \times 100\% \][/tex]
[tex]\[ \text{Percent yield} \approx 57.96\% \][/tex]
Therefore, the percent yield of NaCl is approximately 57.96%.
ANSWER ASAP WILL BE GIVING MEDAL HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! On cold winter nights a mother places a portable heater in her toddler's bedroom. the heater does not have a fan to blow hot air, it only has simple metal coils that get very hot. A) Convection B) Conduction C) Radiation D) Induction
On cold winter nights, a mother places a portable heater in her toddler's bedroom. The heater does not have a fan to blow hot air, it only has simple metal coils that get very hot. Therefore, option C is correct.
What is metal coil ?Metal coil is created by winding or coiling a finished steel product, such as a sheet or strip, after it has been rolled. The width of the steel coil is substantially greater than the thickness. Steel coils can be categorized as Hot Rolled, Cold Rolled, or Galvanized, depending on the production process.
Depending on the industry, different uses for steel coil can be found, but some of the more common and well-known ones are pipe manufacture, structural steel components, electronic components, consumer goods, automobile parts, and many more.
In the ignition system of a vehicle, the metal coil is an induction coil that converts the battery's voltage to the thousands of volts required to produce an electric spark in the spark plugs that ignites the fuel.
Thus, option C is correct.
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Which graph shows negative acceleration? Graph A shows negative acceleration because the velocity is changing.
Graph A shows negative acceleration because the velocity is increasing.
Graph B shows negative acceleration because the velocity is decreasing.
Both graphs show negative acceleration.
Complete the sentence electrical conductivity of a sample will _____ when the size of the sample increases
The most appropriate word to complete the sentence is: stay the same.
The complete sentence is then written as: "The electrical conductivity of a sample will stay the same when the size of the sample increases."
Conduction refers to the transfer of thermal energy or electric charge as a result of the movement of particles through a conductor such as a metal.
Generally, when conduction relates to electric charge (current), it is referred to as electrical conduction.
Hence, electrical conductivity is a measure of the ability of a material or metal to conduct electricity by allowing the flow of electrons and current.
In Science, there are three (3) main factors that affect the electrical conductivity of a material and these include;
Temperature.Type of electrolytes (ions).Concentration of ions.However, the size of a material does not affect its ability to conduct electricity.
In conclusion, the electrical conductivity of a sample will stay the same when the size of the sample increases.
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An atom of which element in the ground state contains electrons in the fourth principal energy level?
Use the term chloroplast and organelle in a sentence
Which of the following muscles can you control?
biceps
quadriceps
deltoid
all of the above
Answer:
All of the above i think sorry if im wrong
Explanation:
Describe the cycle that involves soil, decomposers, and other living things
Final answer:
Biogeochemical cycles involve the recycling of nutrients like carbon and nitrogen through soil, decomposers, and other living things. Decomposers break down dead organisms, releasing nutrients back into the soil for use by plants and entering the food chain. These cycles sustain the stability and balance of ecosystems.
Explanation:
The cycle involving soil, decomposers, and other living things is known as a biogeochemical cycle. Decomposers, such as bacteria and fungi, play a critical role in these cycles by breaking down dead organisms and animal wastes. This process recycles nutrients like carbon and nitrogen back into the soil, where they can be taken up by plants. These nutrients then enter the food chain, supporting plant and animal growth.
Decomposers, including bacteria and fungi, use organic material as a source of energy and nutrients, contributing to the stability of ecosystems. Without decomposers, dead material would accumulate, and essential nutrients would be locked within them, unavailable to producers. Therefore, decomposers are crucial in maintaining the balance of nutrients in the ecosystem.
Biogeochemical cycles like the carbon cycle, nitrogen cycle, and water cycle are essential for life on Earth. They all represent the continuous exchange of water and nutrients between the biotic and abiotic components of the planet, demonstrating the connected nature of all living and non-living elements within an ecosystem.
What is the solid, rocky outer layer of the mantle?
how does the sun cause wind
Waters states of matter include steam liquid water and ice. What about water is the same in the states? What can you conclude about what changes and what does not change during a change of state?
Water's composition remains as H2O across all states—solid (ice), liquid (water), and gas (steam)—while the arrangement and kinetic energy of the molecules change, affecting the density and physical properties of water.
Explanation:Understanding Water's States of Matter
Water can exist in solid, liquid, and gas states; namely ice, liquid water, and steam, respectively. The composition of water does not change across these states; it is always H2O, with two hydrogen atoms bonded to one oxygen atom. However, what changes during a change of state is primarily the amount of kinetic energy of the water molecules, which affects their movement and arrangement.
As water moves from solid to liquid, the molecules gain kinetic energy and start to move more freely, allowing the water to take the shape of its container. As a liquid transforms into a gas, the molecules gain even more kinetic energy, move faster, overcome attractive forces, and spread out to fill the entire volume of the container. The changes in states of matter are physical changes and do not affect the chemical makeup of water molecules.
The density of water also changes with the state it is in. The density is highest in the liquid state and decreases when water is in the form of its solid state, ice. This is due to the molecular arrangement in ice that creates a crystalline structure with more space between the molecules. Conversely, water vapor has the least density as the molecules are spread out the most.
The earths core is made up of two parts-the inner and outer core. The inner core is made mostly of
The answer is (D) Solid Metal
The following characteristics describe which of these terms? The substance is mixed uniformly throughout and each part of the substance contains the same ratio of materials with the same properties.
A.homogeneous mixture
B. compound
C. heterogeneous mixture
D. pure substance
Answer: The correct answer is (A).
Explanation:
Homogeneous Mixtures are the mixture in which:
Substance is uniformly distributed throughout the medium.Each part of the mixture contains same ratio of the substance.Properties of the substance remains unchanged.For example: Sugar in water, alloys of metals etc.