The true statement about the periodic table is that metals are found on the left side of the periodic table, and nonmetals are located on the upper right, with a diagonal band of semimetals separating them.
Explanation:The correct answer to the question "Which sentence about the periodic table of elements is true?" is that metals are found on the left side of the periodic table. This is because the elements can be categorized generally into metals, nonmetals, and semimetals, and it is known that metals occupy the left side of the periodic table. Nonmetals are found primarily on the upper right side, and they are divided from metals by a diagonal band of semimetals. Specifically, Group 1 contains the alkali metals, and Group 2 houses the alkaline earth metals, while Group 17 has the halogens and Group 18 has the noble gases, which are nonmetals.
Consider the following equation in chemical equilibrium. C2H4(g) + H2(g) mc009-1.jpg C2H6(g) + 137 kJ What happens to the amount of ethane (C2H6) when the temperature of the system is increased? The amount of ethane decreases. The amount of ethane increases initially and then decreases. The amount of ethane increases. The amount of ethane decreases initially and then increases.
Answer:
The correct answer is a) the amount of ethane decrease.
what’s the difference between direct and indirect methods of flood control?
Final answer:
Direct methods of flood control involve structural defenses like dams and levees, while indirect methods employ natural solutions, such as afforestation and wetland development, to absorb and manage water flow.
Explanation:
The difference between direct and indirect methods of flood control involves the approach taken to manage and reduce the impact of floods. Direct methods are structural solutions like levees, dams, and reservoirs that physically prevent floodwaters from reaching vulnerable areas. These methods can control the flow of water, store excess water during times of heavy rain, and are often engineered to protect specific locations.
Indirect methods include strategies like afforestation, maintaining mangrove forests, or developing wetlands, which aim to enhance the natural capacity of the environment to manage water levels without the construction of artificial barriers. Indirect methods can absorb and slow the water to reduce flooding, benefiting the ecosystem and reducing the risk of erosion on a broader scale.
Both Decca and LORAN used _______ to determine location.
The Mystery Salt
Imagine that you have a barrel of salt, but you forgot to label it. You know it must be either KNO3, or KCl.
You look at the solubility curves for KNO3 and KCl and you find that at 35 degrees Celsius, 100 g of water can dissolve about 30 g of KNO3, or about 37 g of KCl.
You have a scale, a hot plate, a thermometer, empty beakers, and plenty of water.
1. How can you determine whether the barrel contains KNO3 or KCl? Hint: What property could you use to identify the mystery salt? (1 point)
2. Explain exactly what you would do and why you would do it. (2 points)
3. How would your results identify the mystery salt? Hint: What results would indicate KNO3? What results would indicate KCl? (2 points)
Question 1 :
To determine whether the salt is KCl or KNO3, one should look for the difference between them in terms of their physicochemical properties, such as their solubility.
Since we have the solubilité of KCl and KNO3, we can use the property of solubility to determine if the mystery salt is KCl or KNO3.
Question 2:
We will try to reproduce the conditions to determine the solubility of the salt at 37°C.
We will put into the beaker 100ml of water (equivalent to 100g) and dissolve a defined quantity of the salt (the number should be between the solubility of the KCl (37g) and KNO3 (30g) so between 30g and 37g).
Let's dissolve for example 32g of the salt, then, heat with the hotplate until the temperature of the beaker content will be 35 ° C (use the thermometer to determine the exact temperature).
Why?
This manipulation aims to determine the solubility of our mystery salt to know if it is KNO3 or KCl. In our conditions, we will obtain two different possibilities depending on if the salt is KCl or KNO3, this justifies why we took a quantity between 30g and 37g of salt.
If it is KNO3 (solubility of 30g/ml) we will observe a precipitation in the beaker because we exceed its solubility.
If it is KCl (37g/100) we will not observe a precipitate since we did not attempt the solubility of KCl
Question 3:
Finally to determine the composition of salt: we know that the solubility of KCL is 37g / 100ml (that is to say if we dissolve a higher mass (38g for example), we will observe a precipitation of salt) and that the solubility of KNO3 is 30g / 100ml (that is to say if we dissolve an upper mass (32g for example), we will observe a precipitation of salt)
In our experiment, 32g of salts were dissolved. If it is KCl, we will not observe a precipitate since the minimum concentration to start having a precipitate is not yet reached (37g / 100ml).
If it is KNO3, a precipitate will be observed since the minimum concentration to start having a precipitate is not yet reached (30g / 100ml).
Functional groups confer specific chemical properties to the molecules of which they are a part. in this activity, you will identify which compounds exhibit certain chemical properties as well as examples of those six different compounds.drag one molecule (white label) and one chemical property (blue label) to each bin.
Functional groups chemically define a molecule. Examples include hydroxyl (-OH), carbonyl (C=O), carboxyl (-COOH), amino (-NH2), phosphate (-PO4), and sulfhydryl (-SH), each conferring unique chemical properties such as polarity, reactivity, or the ability to form certain kinds of bonds.
Explanation:In the context of chemistry, functional groups determine the chemical properties of a molecule. For instance, a hydroxyl group (-OH) confers alcohol-like properties to a molecule, making it polar and capable of forming hydrogen bonds. Similarly, a carbonyl group (C=O) introduces reactivity and polarity to compounds known as aldehydes or ketones. A carboxyl group (-COOH) imparts acidic properties, while an amino group (-NH2) gives a molecule basic properties. Another example is a phosphate group (-PO4), often seen in DNA and ATP, that makes a compound acidic and highly reactive. Finally, a sulfhydryl group (-SH), commonly found in some amino acids, gives a molecule the ability to form disulfide bonds.
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Within an atom, electrons A. are in motion inside the nucleus. B. are in motion outside the nucleus. C. are inside the nucleus and are motionless. D. are outside the nucleus and are motionless
Hello! The correct answer is, B. are in motion outside the nucleus.
I hope this helped!
Within an atom, electrons are in motion outside the nucleus of an atom. The correct answer is option B.
An electron is a subatomic particle that carries a negative electric charge. It is one of the fundamental particles that make up atoms, along with protons and neutrons.
The electrons move around the nucleus in specific energy levels or orbitals, which determine the chemical and physical properties of the element. The electrons are negatively charged particles and are attracted to the positively charged protons in the nucleus, which keeps them in orbit around the nucleus. The electrons are not motionless but are constantly moving and can be excited to higher energy levels by absorbing energy or by interacting with other atoms or particles.Therefore, option B. are in motion outside the nucleus, is the correct answer.
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which of the following statements is not a description of neptune?
A. known for its strongest winds
B. has no atmosphere
C. one of the gas giants
D . has moons
Answer:
It has no atmosphere
Explanation:
A solution is a mixture _____. in which a solid solute is always dissolved in a liquid solvent that is heterogeneous that has the same properties throughout from which the solute can be filtered
Answer: A solution is a homogeneous mixture inwhich a solid solute is dissolved in a solvent .
Example , milk in water.
Table salt in water.
Chemical solutions are homogeneous. Properties are same throughout.
While heterogeneous solution, there are more than two types of matter like solid, liquid.
Example, sand in water, ice cubes in drinks.
A 5.63 g sample of solid gold is heated from 21.0 ºC to 32.0 ºC. How much energy (in J and cal) is required?
Final answer:
The energy required to heat a 5.63 g sample of solid gold from 21.0 °C to 32.0 °C is approximately 8.0239 J or 1.9174 cal, using the specific heat capacity of gold (0.129 J/g°C).
Explanation:
To calculate the energy required to heat the sample of solid gold, we can use the formula: q = mcΔT, where q is the heat energy in joules (J), m is the mass of the substance in grams (g), c is the specific heat capacity (J/g°C), and ΔT is the change in temperature in degrees Celsius (°C).
The mass m of solid gold is 5.63 g, and the specific heat capacity c of gold is given as 0.129 J/g°C. The change in temperature ΔT is (32.0 °C - 21.0 °C) = 11.0 °C.
Therefore, the energy required in joules is:
q = (5.63 g) × (0.129 J/g°C) × (11.0 °C) = 8.0239 J.
To convert joules to calories, we use the conversion factor: 1 cal = 4.184 J. Therefore,
q in calories is: q = 8.0239 J × (1 cal / 4.184 J) = 1.9174 cal.
The energy required to heat the sample of gold from 21.0 °C to 32.0 °C is approximately 8.0239 J or 1.9174 cal.
Find the number of moles 847g (NH4)2CO3
The first stable compound produced from co2 in the light-independent reaction is
The first stable compound produced in the light-independent reactions of photosynthesis from [tex]CO_2[/tex] is 3-phosphoglyceric acid (3-PGA), catalyzed by the enzyme RuBisCO in the stroma of the chloroplast.
The first stable compound produced from [tex]CO_2[/tex]in the light-independent reactions, also known as the Calvin cycle, is 3-phosphoglyceric acid (3-PGA). During the initial stage of fixation, which occurs in the stroma, an enzyme called ribulose bisphosphate carboxylase (RuBisCO) catalyzes the reaction of [tex]CO_2[/tex] with ribulose bisphosphate (RuBP). For each molecule of [tex]CO_2[/tex] that combines with one molecule of RuBP, two molecules of 3-PGA are produced. This step in the Calvin cycle is crucial as it marks the incorporation of inorganic carbon from [tex]CO_2[/tex] into an organic molecule, which can then be converted into glucose and other carbohydrates that are essential for plant energy and growth.
Which of the following is not true about the dilution of a solution?
the concentration decreases
the amount of solute remains constant
the volume decreases
the amount of solvent increases
Which term is defined as the change in the direction of light when it goes from one medium into a different medium?
Question options:
Reflection
Refraction
Diffraction
Absorption
Light traveling through air strikes the surface of the four different materials below. Which material reflects light but does not refract it?
Question options:
Diamond
Prism
Metal spoon
Water droplets
Reflection happens when a wave __________ .
Question options:
compresses air particles as it travels
compresses air particles as it travels
strikes an object and bounces off of it
causes ripples in a body of water
Why does the pencil appear broken in the cup of water?
Question options:
Electromagnetic/Light waves cannot travel through solids.
Electromagnetic/Light waves travel at different speeds through different media.
Electromagnetic/Light waves compress more when they travel through denser media.
Electromagnetic/Light waves get closer together when they go through dense media like glass.
What is occurring when a light wave diffracts?
Question options:
The light wave is bending around an obstacle or through a barrier.
The light wave is bending when it goes from gas to liquid.
The light wave is bouncing off of a smooth surface.
The light was is absorbing.
On a beautiful night in Washington D.C., you see a mirror image of the Washington Monument and surrounding scenery. What causes this mirror image?
Question options:
White light
Refracted light
Absorbed light
Reflected light
The BEST example of diffraction is the image of
Question options:
A ring around the Sun caused by particles in the air.
Looking down in the pool and seeing your foot appearing to be broken from your leg.
A fingerprint that appears to be enlarged under a magnifying glass.
Seeing your face as it appears in a mirror.
Which statement is true about transmission and absorption?
Question options:
Transmission is when light passes through an object and absorption is when some or all of the light is taken in or absorbed by the object.
Transmission is when light cannot go through an object and absorption is when light bounces off an object.
Transmission is when light bounces off an object and absorption is when light passes through an object.
Transmission and absorption are when the light bounces off of an object.
Answers of this questions are,
1) Reflection
2) Metal spoon
3) strikes an object and bounces off of it.
4) Electromagnetic/Light waves cannot travel through solids.
6) The light wave is bending around an obstacle
7)Reflected light
8) A ring around the Sun caused by particles in the air.
9) A = True
What is Reflection ?Reflection is the change of direction of the wave at the interface which separates two media. it get incident on the other media and get return to the same media is called as reflection. Common examples include the reflection of light, sound and water waves.
we can see that in the dark room when we incident light on the mirror, the direction of the light changes at the point of the incidence. in the scientific language we can say that light has reflected from the surface of the mirror. in this case angle of incidence is always equal to angle of reflection.
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How does improving food-storage facilities make farming more sustainable?
A. It decreases the amount of water needed.
B. It keeps food from rotting as quickly and being wasted.
C. It decreases the amount of land needed.
D. It keeps chemicals from entering the watershed.
B. is indeed correct
Which reason best explains why carbon is able to form macromolecules?
What chemical changes were responsible for the color changes? (While doing a red cabbage juice lab and finding out if substances were acid,base, or neutral based on what color they turned)
The color changes in the red cabbage juice lab are the result of chemical changes caused by the reaction between the substances being tested and the acid-base indicators in the cabbage juice.
Explanation:The color changes observed during the red cabbage juice lab are a result of chemical changes caused by the reaction between the substances being tested and the red cabbage juice. The red cabbage juice contains natural compounds called acid-base indicators, which change color depending on the pH of the solution. When an acidic or basic substance is added to the cabbage juice, it reacts with the acid-base indicators, causing a change in color.
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what effect does adding a solute have on the boiling point of a solution? a. the temp. at which the solution boils is lowered b. the temp. at which the solution boils is unchanged c. the temp. at which the solution boils is raised d. the solution will never reach a boiling point temp.
A dissolved solute raises the boiling point of a solvent.
gas-to-liquid synfuel production can produce diesel, naptha and paraffin. The formation of these products usually involves _____. the Fischer-Tropsch Process the removal of carbon atoms from the fuel adding highly acidic substances such as hydrochloric acid the production of radioactive waste that must be stored in protective barrels
Write the name for sn(so4)2. remember that sn forms several ions.
Answer: The name of the given compound is tin (IV) sulfate.
Explanation:
The given compound is formed by the combination of tin ions and sulfate ions. It is an ionic compound.
The nomenclature of ionic compounds is given by:
Positive ion is written first.The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.In case of transition metals, the oxidation state are written in roman numerals in bracket in front of positive ions.In the given compound, tin is present in +4 oxidation state.
Hence, the name of the given compound is tin (IV) sulfate
Is a compound containing carbons, hydrogens, and hydroxyl groups (oh) that serves as the "backbone" for various lipids?
A 6.0 l container holds a sample of hydrogen gas at 150 kpa. if the pressure increases to 2 atm and the temperature remains constant, what will the volume be?
Answer:
The volume will be 4.44 L
Explanation:
Data:
First volume, V1 = 6 L
First pressure, P1 = 150 kPa -> 150 kPa * 1 atm/101.325 kPa = 1.48 atm
Second pressure, P2 = 2 atm
Second volume, V2 = ? L
From Boyle's law:
P1*V1 =P2*V2
V2 = P1*V1/P2
V2 = 1.48*6/2
V2 = 4.44 L
To accurately measure out 35 milliliters of liquid, you should use:
a 10-mL glass pipette several times
a 50-mL beaker
a 25-mL graduated cylinder two times
a 50-mL graduated cylinder one time
what type of weathering effects granite
the vapor pressure of 25 milliliters of water at 25 degrees celcius will be the same as
The vapor pressure of 25 milliliters of water at 25 degrees Celsius is 23.8 mmHg. The exact molecular formula of substance Xy would require additional information such as the actual change in vapor pressure caused by the added solute and comparison with Raoult's Law to determine the number of moles of solute.
Explanation:The vapor pressure of 25 milliliters of water at 25 degrees Celsius is a physical property dependent on temperature, not the volume of water. Therefore, it is the same regardless of the amount of water present, provided that there is enough water to establish an equilibrium between liquid water and water vapor. The vapor pressure is given by its equilibrium at a certain temperature, and for water at 25 degrees Celsius, it is 23.8 mmHg.
To determine the molecular formula of substance Xy from the information given, we can use Raoult's Law and the concept of molality. First, we calculate the number of moles of substance Xy using its molecular weight and the mass of the substance provided. Next, we use the change in vapor pressure and Raoult's Law to find the molality and the number of moles of solute, which gives us the value of the subscript y in the molecular formula Xy.
Final answer:
The vapor pressure of 25 milliliters of water at 25 degrees Celsius will be similar to the vapor pressure of pure water at that temperature, which can be estimated using the given table.
Explanation:
The vapor pressure of 25 milliliters of water at 25 degrees Celsius will be the same as the vapor pressure of pure water at that temperature. According to the table provided, the vapor pressure of water at 25 degrees Celsius is not given. However, we can use the information given at other temperatures to make an estimate.
For example, according to the table, the vapor pressure of water at 30 degrees Celsius is 42.2 mmHg, and at 20 degrees Celsius it is 17.5 mmHg. Since vapor pressure generally increases with temperature, we can estimate that the vapor pressure of water at 25 degrees Celsius will be closer to 30 degrees Celsius than to 20 degrees Celsius.
Therefore, we can estimate that the vapor pressure of 25 milliliters of water at 25 degrees Celsius will be around 42.2 mmHg.
Which of these can be used to distinguish a mixture from a compound?
If 2.34 g of NaCl was formed how many moles of NaHCO3 must have been used in the reaction? (Report only the numerical portion of your answer [i.
e. leave off the units] to 3 significant digits)
If 2.34 g of NaCl was formed, the number of moles of NaHCO3 must have been used in the reaction is 0.0800 mol
Explanation:To determine the number of moles of NaHCO3 that must have been used in the reaction, we need to use the balanced chemical equation and the given mass of NaCl.
The balanced chemical equation for the reaction is: 2 NaHCO3 + H2SO4 → 2 CO2 + Na2SO4 + 2H2O
From the balanced chemical equation, we can see that there is a one-to-one ratio between NaCl and NaHCO3.
Therefore, the number of moles of NaHCO3 used in the reaction is the same as the number of moles of NaCl formed.
To find the number of moles of NaHCO3, we need to convert the mass of NaCl to moles using the molar mass of NaCl.
The molar mass of NaCl is 58.44 g/mol (22.99 g/mol for Na + 35.45 g/mol for Cl).
Let's assume that x moles of NaHCO3 were used in the reaction.
From the balanced chemical equation, we know that 2 moles of NaHCO3 react to form 2 moles of CO2.
Therefore, the molar ratio between NaHCO3 and CO2 is 2:2.
Since we have found that there are 2.34 g of NaCl formed, we can now set up the following equation:
x moles NaHCO3 = 2.34 g NaCl × (1 mol NaCl/58.44 g NaCl) × (2 mol NaHCO3/2 mol NaCl)
Calculating this, we get:
x = 0.0800 mol
So therefore the number of moles of NaHCO3 is 0.0800 mol
How do phospholipids interact with water molecules? how do phospholipids interact with water molecules? phospholipids dissolve in water. phospholipids do not interact with water because water is polar and lipids are nonpolar. the polar heads interact with water; the nonpolar tails do not. the polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract)?
Answer:
the phosphate head mixes with water ;the fatty acid tails do not
Explanation:
When 1.0 mole of fe(s) reacts with excess o2(g) and 0.325 moles of fe2o3 are produced. what is the %yield of fe2o3?
Final answer:
The %yield of Fe2O3 from the reaction of 1.0 mol of Fe with excess O2 producing 0.325 moles of Fe2O3 is calculated to be 65%, using the stoichiometric ratios from the balanced chemical equation.
Explanation:
The question involves calculating the %yield of Fe2O3 when 1.0 mole of Fe(s) reacts with excess O2(g) and produces 0.325 moles of Fe2O3. To determine the theoretical yield, we must first understand the balanced equation of the reaction, which is 4 Fe + 3 O2 → 2 Fe2O3. From this equation, we can deduce that 4 moles of Fe should ideally produce 2 moles of Fe2O3. Given that we started with 1.0 mol of Fe, the theoretical yield for Fe2O3 would be 0.5 mol, considering the stoichiometric ratios.
To find the %yield, we use the formula: (%yield) = (actual yield / theoretical yield) × 100%. Substituting the given values, we have (%yield) = (0.325 mol / 0.5 mol) × 100% = 65%. Therefore, the %yield of Fe2O3 when 1.0 mole of Fe(s) reacts with excess O2(g) to produce 0.325 moles of Fe2O3 is 65%.
How many hydrogen atoms are attached to each carbon adjacent to a double bond? nurition?
How much water must be evaporated from 8 ounces of a 1 % salt solution to make a 2% salt solution?