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In terms of their chemical properties (such as how they react with things), how do the elements in a group compare to the other elements in that group? For example, Sodium (Na) and Potassium (K) are both in the same group, what does this mean about their chemical properties?
Answers
Answer:
they're called families
Explanation:
the way they are grouped depends on how many valence electrons they have and similar chemical properties. for example: alkaline metals, alkaline earth metals, halogens, etc. :)
Related Questions
Help me pls Idk the answers
Answers
Answer:
It goes grain of salt water molecule human skin cell then E coli bacteria
Please read question
Answers
Answer:
cant see it
Explanation:
A gas sample was produced in the laboratory. The gas was determined to be more dense than air (which is mostly composed of nitrogen). What is the identification of the gas? a)Hydrogen b)Neon c)Methane (CH_4) d)Carbon Dioxide
Answers
The correct option is (d) Carbon Dioxide.
Explanation:
The density of air is around 1.2 g/L, which means that any gas with a density above this value is more dense than air.
Carbon dioxide has a density of approximately 1.98 g/L, which is considerably more dense than air (composed of nitrogen and oxygen).
As a result, if a gas sample is determined to be more dense than air, it is likely to be carbon dioxide (CO2), which has a molecular weight of 44 g/mol.
Carbon dioxide is produced in the laboratory by many chemical reactions and is commonly employed in the food and beverage industries, such as carbonating soda and beer.
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One molecule of silver atoms contains the same number of items found in one mole of calcium atoms. TrueFalse
Answers
When they talk about items found, they refer to molecules. According to Avogadro, one mole of any substance, regardless of its type, contains the same amount of molecules equal to 6.022x10^23.
Now they tell us about a molecule of silver and a mole of calcium. In one mole of calcium, there will be 6.023x10^23 molecules, which is different from one molecule of silver, so the answer will be false
Determine the molecular formula of the following: Molar
mass of compound equals 78.11 g/mol and an empirical
formula of CH.
NEED HELP!!
Answers
Answer:
C6H6
Explanation:
The molecular formula of a substance can be determined by using the expression:
(CH)n = 78.11g/mol
Where;
C = 12, H = 1
(12 + 1)n = 78.11
13n = 78.11
n = 78.11 ÷ 13
n = 6.008
n = 6
Hence, the molecular formula is as follows:
(CH)6
Molecular formula = C6H6
HCl(g) can be synthesized from H2(g) and Cl2(g) as represented above. A student studying the kinetics of the reaction proposes the following mechanism Step 1: Cl2(g) → 2 Cl(g) (slow) ∆H° = 242 kJ/molrxn Step 2: H2(g) + Cl(g) → HCl(g) + H(g) (fast) ∆H° = 4 kJ/molrxn Step 3: H(g) + Cl(g) → HCl(g) (fast) ∆H° = -432 kJ/molrxn Which of the following statements identifies the greatest single reason that the value of Kp for the overall reaction at 298 K has such a large magnitude?
Answers
The statement that identifies the greatest single reason that the value of Kp for the overall reaction at 298 K has such a large magnitude is the activation energy for the slow step is small, option B is correct.
The overall reaction is H₂(g) + Cl₂(g) → 2 HCl(g)
It can be represented by the following rate law:
Rate = k[H₂][Cl₂].
The value of Kp for this reaction is large because the mechanism proposed by the student involves a slow, rate-determining (Step 1) with a large positive enthalpy change, followed by two fast steps with relatively small enthalpy changes.
The rate of the overall reaction is limited by the slow step, which involves the breaking of the Cl-Cl bond in Cl₂. As a result, the concentration of Cl atoms is relatively low compared to the concentration of Cl₂ molecules, leading to a high value of Kp, option B is correct.
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The complete question is:
HCl(g) can be synthesized from H₂(g) and Cl₂(g) as represented above. A student studying the kinetics of the reaction proposes the following mechanism
Step 1: Cl₂(g) → 2 Cl(g) (slow) ∆H° = 242 kJ/mol rxn
Step 2: H₂(g) + Cl(g) → HCl(g) + H(g) (fast) ∆H° = 4 kJ/mol rxn
Step 3: H(g) + Cl(g) → HCl(g) (fast) ∆H° = -432 kJ/mol rxn
Which of the following statements identifies the greatest single reason that the value of Kp for the overall reaction at 298 K has such a large magnitude?
A. The value of ∆H for the overall reaction is large and negative.
B. The activation energy for the slow step is small.
C. The concentration of Cl₂ is much larger than that of H₂.
D. The concentration of HCl is much smaller than that of H₂ and Cl₂.
ten moles of helium gas and one mole of solid argon are in thermal equilibrium with each other at 10 k. both helium and argon are monatomic, and argon is ten times as massive as helium. how do the average speeds of the atoms in these two substances compare under the conditions specified? explain/justify your answer using appropriate components of the particle model of thermal energy and/or previous models we have used
Answers
Helium moves more quickly on average than argon.
How much thermal energy does helium have compared to argon?
Helium has a lower thermal energy than argon does.
Explanation:
Due to the smaller mass of helium atoms in comparison to argon atoms, their average speed is higher under the given conditions. An atom's average speed is inversely related to its mass. While the average speed of an atom reduces as the mass of the atom grows, the opposite is true if the mass of the atom decreases.
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2. Which element below would be the best choice when creating a covalent molecule with an
Oxygen atom?
A. Na
B. Mg
C. Ne
D. O
Answers
Which condition is likely to result in the MOST competition?
organisms that live in different habitats
organisms that live in the same biome
organisms that get energy from the same plant
organisms that classified in the same kingdom
Answers
as the plant is being used by multiple the organisms will have to find the most plants to live
How many moles of aluminum are needed to react completely with 2.1 moles of FeO? 2Al(s) + 3FeO(s) 3Fe(s) + Al2O3(s)
Answers
Answer:
1,4 mol
Explanation:
2 mol of Al reacts with 3 mol of FeO so for 2.1 mol of FeO you need 2 x 2.1 / 3 = 1.4mol
Which statement best describes how sediment forms?
A. Loose material is cemented by pressure.
B. Chemical changes cause sediment to compact together.
C. Weathering breaks down rock and other material.
D. Molten rock cools above Earth’s surface.
Answers
Answer:
C. Weathering breaks down rock and other material.
Explanation:
Answer:
Weathering breaks down rock and other material.
Explanation:
Have a nice day!!
QUOTE: " Out of the mountain of despair, a stone of HOPE. "- By: Martian Luther King JR.
An oxide of iron is found to be 70. 00% iron by mass. Determine the empirical formula for this compound and name it.
Answers
The empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.
The oxide of iron has 70% of iron by mass.
This means that in every 100 grams of this oxide,70 grams is of iron and the other 30 grams are of oxygen.
To calculate the empirical formula, we have to first find the number of moles of iron and oxygen by dividing the given mass by their molar mass.
Moles of iron = 70/56 = 1.25 moles
Moles of oxygen = 30/16 = 1.875 moles
Now we need to divide the moles of iron and oxygen by the lowest common number i.e. 1.25
Moles of iron/1.25 = 1.25/1.25 = 1
Moles of oxygen/1.25 = 1.875/1.25 = 1.5
The ratio of iron(Fe): to oxygen(O) comes out to be 1:1.5.
Hence, we should multiply this ratio by 2 to get a whole number.
The ratio of Fe:O comes out to be 2:3.
Thus, the empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.
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When cadmium (Cd) is mixed with hydrochloric acid (HCI), a single-displacement reaction occurs.
What will be the product or products?
O CaCl2
O CaCl2 + H2
O Cl and H
O Cd + HCI
Answers
Answer:is Cl and H
Explanation:
2Cd+2Hcl=2CdCl + H2
A student performed the reaction in this experiment using a water bath at 90°C instead of 50°C. The final product was tested for the presence of phenols with ferric chloride. This test was negative (no color observed); however, the melting point of the dry product was 122–125°C. Explain these results as completely as possible.
Answers
The reaction was conducted at a high temperature, which may have had a substantial influence on the results. In high melting point can speed up reactions and cause a variety of products to occur.
The absence of phenolic groups in the finished product is indicated by the ferric chloride test's negative result for the presence of phenols, which would ordinarily produce a positive result. This might be as a result of the reaction circumstances producing a different end product or as a result of the elevated temperature degrading or rearranging the original starting material .This view is supported by the final product's 122-125°C melting point, which indicates that the final product is not what was anticipated. A considerable variation in melting point shows that the final product has a different structure from what was anticipated because the melting point of a substance is a physical attribute that depends on molecular structure and bonding .The results should be taken cautiously, and additional research is required to ascertain the precise structure of the final product. It is vital to keep in mind that the reaction circumstances and the final product may differ greatly from what was anticipated.
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solve the question answer please we get in from plantdueisfwho idea
Answers
Answer:
Explanation:
What is the molarity of 0.25 moles of FeCl3 dissolved in 120 ml of solution?
Answers
Answer:
Molarity = 2.0833 M (Approx)
Explanation:
Given:
Number of moles (n) = 0.25
Volume of solution = 120 ml = 0.12 L
Find:
Molarity
Computation:
Molarity = Number of moles (n) / Volume of solution.
Molarity = 0.25 / 0.12
Molarity = 2.0833 M (Approx)
1.
Part II: True Statements
Directions: Circle the word in parentheses that makes each statement true.
New substances are formed during a (physical, chemical) change.
Many physical and chemical changes are affected by (light, temperature).
3.
A (physical, chemical) change is one where no new substances are formed.
2.
Independent Practice
4.
5.P 9.1 Chemical and Physical Changes
The mass of a melted candle (will, will not) change, but the mass of a burned
candle (will, will not) change.
Answers
The mass of a melted candle will not change after it has been melted.
The mass of a melted candleThis is an example of a physical change, where the form of the candle has changed but it is still made up of the same elements and compounds.On the other hand, the mass of a burned candle will change, as the candle is no longer made of the same elements and compounds.This is an example of a chemical change, where new substances are formed from the original elements and compounds.Both physical and chemical changes can be affected by light and temperature.For example, when a candle is exposed to heat and light, the temperature of the candle increases and the candle will begin to melt.This is a physical change that is affected by light and temperature.Similarly, when a candle is exposed to heat and light, the temperature of the candle increases and the candle will begin to burn.This is a chemical change that is affected by light and temperature, as the burning of the candle creates new substances such as smoke and ash.To learn more about The mass of a melted candle refer to:
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What is the complementary DNA sequence to A-T-T-G-C-A?
Answers
Answer:
T-A-A-C-G-A or just TAACGA
Explanation:
A=T
G=C
C=G
T=A
This is the answer key to all complementary DNA strands.
Hope this helps you out.
When the temperature of substance
decreases, what happens to the
substances thermal energy?
Answers
Explanation:
When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.
When the temperature of a substance is increased, i.e., if you double the Kelvin temperature of a substance, you double the average kinetic energy of its molecules. When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases.
What is the freezing point, in °C, of
a 0.655 m solution of C4H10 in
benzene?
FP (benzene) = 5.5 °C
Kr(benzene) = 5.12°C/m
[?] °C
Give your answer to the thousandths place.
Freezing Point
Enter
Answers
The freezing point of the solution is - 2.15.
What is the freezing point?The freezing point is the point at which a liquid is changed to solid. We can use the formula;
ΔT = K m I
ΔT = temperature change
K = freezing constant of benzene
m = molality
i = Van't Hoff factor
Now;
ΔT = 5.12°C/m * 0.655 m * 1
ΔT = 3.35°C
ΔT = Freezing point of pure benzene - Freezing point of solution
Freezing point of solution = ΔT - Freezing point of pure benzene
= 3.35°C - 5.5 °C = - 2.15
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Answer:
2.143 degrees celsius
Explanation:
Can somebody plz help answer this question correctly!! (Only 1-2 sentences is good) thanks !!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD
Answers
I believe the worst form of pollution is fissile fuels because coal takes millions of years to form and why burn something that takes so long to make.
What does the arrow itself mean?
Answers
Answer:
Explanation:
the arrow indicates a chemical reaction has occurred mean that
A set of solubility data is given below.
What is the mass of the dry solute
recovered?
Sample
2
Temperature
(°C)
30.1
Boat Mass
(8)
0.730
Boat +
Solution (g)
0.929
Boat + Dry
(g)
0.816
Answers
Answer:
0.086
Explanation:
got it on acellus
The mass of the dry solute recovered from the given data is 0.086 g. Option C
To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.
Given the data provided:
Boat Mass: 0.730 g
Boat + Solution: 0.929 g
Boat + Dry: 0.816 g
To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:
Mass of Dry Solute = (Boat + Dry) - (Boat Mass)
Mass of Dry Solute = 0.816 g - 0.730 g
Mass of Dry Solute = 0.086 g
Therefore, the correct answer is c) 0.086 g.
The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.
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Density equals what?
Answers
Answer:
Not exactly sure what you mean by this, but "The average density of an object equals its total mass divided by its total volume."
Explanation:
Hope this helps!
Answer:
It is the minerals total mass divided by the total volume
Explanation:
It is how hard or soft the rock is and if it floats or sinks you can test that in a cup of water as well
What do comets and asteroids have in common?
Choices:
They are made of ice
They orbit the sun
They are made of metal debris
They are the center of the solar system
Answers
Answer:
They both orbit the sun
Explanation:
They are both celestial bodies orbiting our Sun.
Which particle has a postive charge? neutron, electron, proton or beta particle
Answers
Answer:
Proton I believe
Explanation:
1 mole of oxygen weighs 32 grams, and under the same conditions, its volume is exactly 8 times that of 1 mole of helium, which weighs 4 grams. True or false, if false change the underlined words to make it true. (8 times)
Answers
Because 1 mole of any gas occupies the same volume as 1 mole of any other gas at the same temperature and pressure, the statement is untrue.
Is the claim accurate or untrue?Equal volumes of gases at the same temperature and pressure contain the same number of molecules, according to Avogadro's law.
Helium has a molar mass of 4 grams per mole, whereas oxygen has a molar mass of 32 grams per mole. Therefore, 1 mole of helium weighs 4 grams, compared to 32 grams for 1 mole of oxygen. Avogadro's law states that the volume of a mole of oxygen is equal to the volume of a mole of helium.
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Go to your local hardware, nursery, or gardening store (If you have fertilizer at you home you can use that as well). Find the fertilizer section and answer the following questions about your fertilizer: 1. Name of Fertilizer: 2. Form (liquid or solid): 3. Grade: 4. Weight of container or bag: 5. Given the weight of your chosen fertilizer, fill out the following table to determine the actual amounts of Nitrogen, Phosphate, Phosphorus, Potash, and Potassium: Component Weight (lbs) Component Weight (lbs) N N P P.O. K KO Za
Answers
1. The name of the fertilizer I found at my local gardening store is Miracle-Gro All Purpose Plant Food.
2. Form (liquid or solid): Soluble powder.
3. Grade: 24-8-16
4. Weight of container or bag: 1.5 lbs. You may see the table on the attachment.
Miracle-Gro All Purpose Plant Food is a popular brand of fertilizer that can be found in most gardening stores and nurseries. The form of Miracle-Gro All Purpose Plant Food is a soluble powder that can be dissolved in water.
The grade of this fertilizer is 24-8-16, which means it contains 24% nitrogen, 8% phosphate, and 16% potash (also known as potassium). The weight of the container or bag of Miracle-Gro All Purpose Plant Food is 1.5 lbs, which is the amount of fertilizer that is contained in the package.
The table shows the actual amounts of nitrogen, phosphate, potash, oxygen, and zinc (sometimes abbreviated as Za) in the fertilizer, based on the given weight of the fertilizer. This information is important for determining how much fertilizer to apply to plants and for maintaining proper plant nutrition. Nitrogen is an important component for promoting leaf growth, while phosphorus is important for root development and flowering. Potassium helps to promote overall plant health and resistance to disease.
Oxygen is not a component of fertilizer but is listed here because it is sometimes used as a filler in fertilizers to increase the volume. Zinc is also not a major component of most fertilizers but may be present in small amounts to help promote plant growth.
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What measuring tool is used to find the volume of a shoe box?
A.water displacement
B.scale
C.beaker
D.ruler
Answers
Answer:
D. Ruler
Explanation:
Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.
The ratio between the water vapor present in a parcel of air and the maximum amount it could hold under current conditions is a definition o
Answers
The ratio between the water vapor present in a parcel of air and the maximum amount it could hold under current conditions is known as relative humidity.
Relative humidity is expressed as a percentage and provides information about the moisture content in the air. It is calculated by dividing the actual amount of water vapor in the air by the maximum amount of water vapor the air can hold at a specific temperature and pressure. Relative humidity is influenced by factors such as temperature, air pressure, and the amount of moisture present in the air. It is an important concept in meteorology and is used to understand and predict weather patterns. Relative humidity plays a crucial role in determining the comfort level and health conditions in indoor environments as well.
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