Answer:
halogen
Explanation:
It belongs to Group 17 on the periodic table, which is a halogen
Astatine is a periodic element that is represented as At and has the atomic number of 85. This element belongs to the halogen group of the periodic table. Thus, option b is correct.
What are halogens?Halogens are the group or the families of the periodic table that are characterized by the six elements that are non-metallic in nature. The other halogens are iodine, chlorine, bromine, fluorine, and tennessine.
The astatine element of the halogen group (group 17) is the rarest naturally occurring and have an electronic configuration of [Xe] 4f¹⁴5d¹⁰6s²6p⁵, with atomic number 85.
The isotopes of astatine are not stable and are used to treat a disease like a thyroid in radiotherapy. Also, it is used to treat cancerous cells.
Therefore, option b. the astatine element is a halogen.
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If you have 40 protons, 30 neutrons, and 42 electrons, which of the following is
true? (There are multiple answers!) *
Mass = 40
Mass = 70
Mass = 82
Mass = 112
Charge = -2
Charge = +2
Charge = +10
Charge = -10
4. A sample of nitrogen at 20 degrees Celsius was compressed to 300ml to
0.360mL and its new pressure was found to be 400 Pa. What was the
initial pressure in kPa?
Answer:
We are given:
V(i) = 0.3 L V(f) = 0.36 L
P(i) = x pa P(f) = 400 pa
T(i) = T(f) = 293 k
Using the gas formula:
PV = nRT
Since n , R and T are constant,
PV = k (where k is a constant)
Hence we can say that:
P(i) * V(i) = P(f) * V(f)
x * 0.3 = 0.36 * 400
x = 14.4/0.3
x = 480 pascals
Hence the initial pressure is 480 pascals
Converting to Kpa, we have to divide by 1000
Initial pressure (Kpa) = 0.48
If 2.03 g of oxygen react with carbon monoxide, how many grams of CO2 are formed?
Answer:
The suitable equation for this reaction is
2CO + O₂ -----> 2CO₂
Here, we are given that we have 2 grams of O₂
From the equation, we can see that 2 * Moles of O₂ = Moles of CO₂
Moles of O₂:
2/32 = 1/16 moles
Therefore, the number of moles of CO₂ is twice the moles of O₂
Moles of CO₂ = 2 * 1/16
Moles of CO₂ formed = 1/8 moles
Mass of CO₂ formed = Molar mass of CO₂ * Moles of CO₂
Mass of CO₂ formed = 44 * 1/8
Mass of CO₂ formed = 5.5 grams
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Calculate the mass of water change if the density is 1.02 g/ml and the volume is 62 ml?
Answer:
65.72 g
Explanation:
mass = density × volume
= 1.02 g/ml × 62 ml
= 65.72 g
If 110. grams of potassium carbonate (K2CO3) is dissolved into 300. mL of solution, what is the molarity of the solution?
Answer:
2.65 M
Explanation:
Convert grams of K₂CO₃ to moles. The molar mass is 138.205 g/mol.
(110 g)/(138.205 g/mol) = 0.796 mol
Convert milliliters of solution to liters.
300 mL = 0.300 L
Divide moles of K₂CO₃ by liters of solution.
0.796 mol/0.300 L = 2.65 mol/L = 0.265 M
Answer:
2.7 M
Explanation:
M=moles of solute/volume of solution (L)
First, you need to calculate the number of moles using the given mass and the molar mass.
110 g138.205 g/mol=0.80 mol
Then, you can solve for molarity using the molarity equation.
M=0.80 mol0.300 L=2.7 M
Remember, you need to convert mL to L before you can calculate molarity.
How many atoms of Titanium are in 3 moles?
Explanation:
Because There are 6.022x10^23 atoms per mole; therefore, (6.022x10^23×3)=18.066x10^23 atoms of titanium.
How many elements are there in CH3 CH2COONa
Answer:
There are
Explanation:
There are 10 elements in CH3CH2COONa.
Which subatomic particle is positively charged?
Proton
Neutron
Electron
PSYCHOLOGYDescribe how sensation and perception work together.
Answer:
Perception is the psychological process in which sensory input is organized and interpreted into meaningful information. The sensory and perceptual processes work together so that organisms can make sense out of objects or events that appear in their environment. For example, when looking at a cat, one senses a combination of shapes and colors. The mind instantly processes these visual sensations into something meaningful, letting one know it's a cat.
Explanation:
^^
Answer:
Perception is the psychological process in which sensory input is organized and interpreted into meaningful information. The sensory and perceptual processes work together so that organisms can make sense out of objects or events that appear in their environment. For example, when looking at a cat, one senses a combination of shapes and colors. The mind instantly processes these visual sensations into something meaningful, letting one know it's a cat.
Explanation:
Edge 2021
type of force assessment for midd school
n a coffee cup calorimeter, 100.0 mL of 1.0M NaOH and 100.0 mL of 1.0M HCl are mixed. Both solutions were originally at 24.6 degrees Celsius. After the reaction, the final temperature is 31.3 degrees Celsius. Assuming that all the solution have a density of 1.0g/cm3 and a specific heat capacity of 4.18 J/oCg, calculate the enthalpy change for the neutralization of HCl by NaOH. Assume that no heat is lost to the surroundings or to the calorimeter.
Answer:
Explanation:
mass of the solution = volume x density = 200 x 1 = 200 gm
heat absorbed = m x s x Δ t , s is specific heat , Δt is rise in temperature
= 200 x 4.18 x ( 31.3 - 24.6 )
= 5601 J .
This is the enthalpy change required.
Which determines the reactivity of an alkali metal?
A) its boiling and melting points
B) the shininess of its surface
C) the number of protons it has
D) its ability to lose electrons
ill give brainliest
Answer:
D
Explanation:
It only has one valence electron.
Identify the number with the correct number of significant figures for each step of the calculation and for the final answer. Note that 2 is an exact number. y equals 2.10 StartBracket 9.0 plus 2 times 35.35 EndBracket. 2 (35.35) =
Answer: The answer is 167
Explanation: This is because that was right on edg. so yea heart this tho plsss
Answer:
70.70
Explanation:
Just got it right on edge
1pt Which part of the scientific method helps you figure out what you've learned?
O A. Predict
OB. Observe
O c. Design
OD. Analyze
What is commonly used to run a central heating system?
solar energy
electrical energy
geothermal energy
nuclear energy
how does chemical weathering change rock
Answer:
Not to be rude but its in there. Hope this helps
Explanation:
Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock.
What is described by the VSEPR theory?
O A. The arrangement of atoms in a molecule
B. The oxidation numbers of atoms in a molecule
C. The kind of bonds formed in a molecule
O D. The outside forces operating on a molecule
Answer:
A
Explanation:
Apex
The arrangement of atoms in a molecule is described by the VSEPR theory.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Which of the following statements describes the interaction of water molecules with phospholipids? Which of the following statements describes the interaction of water molecules with phospholipids? The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract). The polar heads interact with water; the nonpolar tails do not. Phospholipids do not interact with water because water is polar and lipids are nonpolar. Phospholipids dissolve in water.
Answer:
The polar heads interact with water; the nonpolar tails do not
Explanation:
A phospholipid contains an ionic head that contains the phosphate group and the nonpolar or hydrophilic tail that is comprised of the alkyl moeity in the phospholipid.
The hydrophilic ionic head can interact with water, while the hydrophilic alkyl tail do not interact with water, hence the answer above.
What is the symbol for the element with the atomic number 8
Answer: O
Explanation: oxygen
Which has the lowest density? *
Wood
Iron
Water
gold
Explain how viscosity is related to the flow and attraction between atoms in a liquid.
(7th grade science)
Answer:
Sample Response: Viscosity refers to a liquid’s resistance to flow. Liquids with a higher viscosity flow more slowly. In liquids that are more viscous, there is a stronger attraction between atoms.
Explanation:
it's the sample response so it's correct lol, I hope it helps.
Answer:
Sample Response: Viscosity refers to a liquid’s resistance to flow. Liquids with a higher viscosity flow more slowly. In liquids that are more viscous, there is a stronger attraction between atoms.
Explanation:
Edge 2021
Physics
A tank contains 120.0 g chlorine gas (Cl2), which is at temperature 76.0°C and absolute pressure 5.70 ✕ 105 Pa. The temperature of the air outside the tank is 19.0°C. The molar mass of Cl2 is 70.9 g/mol. (a) What is the volume of the tank (in m3)? m3 (b) What is the internal energy of the gas (in J)? J (c) What is the work done by the gas (in J) if the temperature and pressure inside the tank drop to 31.0°C and 3.80 ✕ 105 Pa, respectively, due to a leak? (Assume that the air outside the tank can be treated as a vacuum.)
Answer:
Explanation:
Given that:
mass of chlorine gas = 120.0 g
the molar mass of Cl₂ = 70.9 g/mol
The number of moles of chlorine gas = mass/molar mass
The number of moles of chlorine gas = 120.0 g / 70.9 g/mol
The number of moles of chlorine gas = 1.69 mol
Pressure = [tex]5.70 \times 10^5 \ Pa[/tex]
Temperature = 19.0°C = (273 + 76) K = 349 K
Universal Gas constant R = 8.314 J/mol/K
Using Ideal gas equation:
PV = nRT
V = nRT/P
V = (1.69 × 8.314 × 349)/ [tex]5.70 \times 10^5[/tex]
V = 4903.68034/ [tex]5.70 \times 10^5[/tex]
V = 0.008603 m³
Thus, the volume V of the tank = 0.008603 m³
For diatomic gas, the internal energy can be calculated by using the formula:
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times nRT[/tex]
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times 1.69 \times 8.314 \times 349[/tex]
internal energy [tex]E_{int}[/tex] = 12259.2 J
If there is a temperature and pressure drop;
the new temperature = 31.0°C = (273 + 31) K = 304 K
the new pressure = [tex]3.80 \times 10^5 \ Pa[/tex]
We need to understand that the aftermath of the reduction in chlorine gas resulted in a decrease in temperature and pressure. Since nothing is affecting the volume of the chlorine gas, then there is no work done.
Thus, work done will be zero because there is no change in the volume or an isochoric process.
What is required for sexual reproduction to occur? an individual that produces sperm and an individual that produces eggs an individual that produces sperm and an individual that produces spores an individual that produces buds and an individual that produces spores an individual that produces buds and an individual that produces eggs
Answer:
It is A.
Explanation:
I hope this helps have a great day.
Answer:
A
Explanation:
an individual that produces sperm and an individual that produces eggs
you need egg and sperm for a new offspring aka a zygote
Which starch solution will decrease in volume as osmosis occurs?
Different ____ of an element have different numbers of neutrons
Answer:
different elements have different numbers of neutrons.
NH3 + HCI —> NH4CI synthesis O decomposition O single replacement O double replacement
Answer:
synthesis
Explanation:
The reaction given is a synthesis reaction or combination reaction.
Given equation:
NH₃ + HCl → NH₄Cl
In a synthesis reaction, a single product is formed from two or more reactants
A + B → C
The formation of compounds from the union of constituent elements also falls into this category.
So the given reaction is a synthesis reaction.
In a decomposition reaction two or more products are formed from a single reactant
In a single replacement reaction, one substance replaces another.
In double replacement reactions partners in a chemical specie are exchanged.
Therefore the given reaction is a synthesis reaction
Apples are peeled, cored, and pureed to produce an unpasteurized applesauce. The applesauce must be heated to 96°C to ensure that it is microbiologically stable for hot fill packaging. A tube-in-tube heat exchanger is used to heat the applesauce (Cp = 3.83 kJ/kgK) from an initial temperature of 10°C to the target temperature. Steam at 130°C with 70% quality is used as the heating medium with the condensate leaving the heat exchanger at 130°C.
How much steam (mass flow rate in kg/hr) is required per kilogram of applesauce processed?
19. The air, soil, and most foods and beverages are examples of _____. mixtures compounds pure substances elements
What molecules does a plant need to make glucose in the process of photosynthesis? Choose all correct answers. carbon dioxide light oxygen water
Answer: carbon dioxide and water.
Explanation: I took the test
Answer:
water and carbon dioxide
Explanation:
i took the K12 test :p
A student is in class 400 minutes every day for 5 days each week. How many seconds
Is this?
Conversion factors: 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 seconds
120,000 sec
1,200,000 sec
12,000 sec
60,000 sec
If a student is in class 400 minutes every day for 5 days each week, then there would be 120000 seconds, therefore the correct answer is option A.
What is multiplication?Finding the product of two or more numbers in mathematics is done by multiplying the numbers. It is one of the fundamental operations in mathematics that we perform on a daily basis.
As given in the problem If a student is in class 400 minutes every day for 5 days each week,
The number of minutes a student in class in a day = 400 minutes
The number of seconds a student in class in a day = 400 × 60 seconds
The number of seconds a student in class in a week = 400 × 60 × 5 seconds
The number of seconds a student in class in a week = 120000 seconds
Thus, the correct answer is option A.
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