Answer:
the number of moles of atom is 0.91584
The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?
*Atomic radii decrease from left to right across a period and decrease from top to
bottom in a group.
*Atomic radii increase from left to right across a period and increase from top to
bottom in a group.
*Atomic radii decrease from left to right across a period and increase from top to
bottom in a group.
*Atomic radii increase from left to right across a period and decrease from top to
Wottom in a group.
Answer:
The answer is: Atomic radii decreases from left to right across a period and increases from top to bottom in a group.
Explanation:
which of the following best describes a decomposition reaction?
a. two substances combine to form a single new substance
b.two substances recombine to form two new substances
c. one element takes place of another in a compound
d. a single substance breaks down
Answer:
d.
Explanation:
because its right :)
The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.
What is Decomposition Reaction ?Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.
Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.
Therefore, The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.
Learn more about Decomposition reaction here ;
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help me pleaseeee, ty if you doo :))
Sarah wants to know where in her garden chamomile would grow the best. She thinks chamomile will grow best in the corner of the garden that gets the most sunlight. To test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment.
Answer:
This question is incomplete and lacks options, the complete part and the options are:
Which of the following variables should Sarah change from one group of chamomile to the next?
A. the location of the plants
B. the height of the plants
C. the type of plants
D. the amount of water she gives the plants
The answer is A
Explanation:
This question is asking for the INDEPENDENT VARIABLE in the experiment. The independent variable of an experiment is the variable that is changed or manipulated by the experimenter in order to bring about a response.
In this experiment where Sarah wants to know where in her garden chamomile plants would grow the best. She hypothesizes that chamomile will grow best in the corner of the garden that gets the most sunlight. However, to test this hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. The variable that Sarah can change in the several groups of chamomile (independent variable) is the LOCATION OF THE PLANTS.
Note that, "where" is a question of location.
Answer:
The answer is C
Explanation:
If the grass contains 220,000 kcal of energy, who much energy will be available to the owl?
Answer:
Generally, consumers only receive 10% of the energy from what they eat. So, if the grass had 220,000 kcal of energy, then the cow would receive 10% of that - 200kcal. And then when a human eats the cow, it will only receive 10% of the cow's energy. This is because within a food chain, energy is lost as organisms use their energy to survive - like moving and producing heat (if endothermic). So consumers do not get 100% of their food's energy. Hope this helps a little.
Explanation:
How dose nuclear energy can be transform form one form to another form
Explanation:
Nuclear energy is found in the nucleus of an atom holding nuclear materials in place.
When a nuclear decay or fusion occurs, the energy is released.
Most times, the nuclear energy is transformed into heat energy. The heat energy is used to do other forms of work that converts energy from one form to another. It can be converted to mechanical energy when water is boiled and used to drive turbines. It can be used in heating chambers. this and many more can lead to energy transformationA process by which softer, less weather-resistant rocks wear away and leave harder, more weather-resistant rocks behind is called a. differential weathering. c. chemical weathering. b. mechanical weathering. d. ice wedging.
Answer:
geosphere
Explanation:
Answer:
differential weathering.
Explanation:
In order to determine if 2 atoms are cooper what must be the same for each
Which value indicate the strongest base
A. pH of 2
B. pH of 5
C. ph of 12
D. pH of 8
Explanation:
The highest number is the strongest base. Therefore the pH of 12 is the strongest base here (C).
Why does nitrogen have stronger attractive forces between its nucleus and valence electrons than phosphorus?
Answer:
Nitrogen atom is small in size than phosphorus thus the bond between its nucleus and valence electrons are stronger than phosphorus.
Hope it helps...｡◕‿◕｡
Which set of properties is most characteristic of transition elements?
Answer:
C.
Explanation:
Transition elements like, for example, iron:
Fe2+ green colored in solution.
Fe3+ brown colored in solution.
formula of preparation of sodium hydroxide
The chemical formula of sodium hydroxide is NaOH, and its molar mass is 40.01 g/mol. It is the alkali salt of sodium, and its structure is shown below:
It is an ionic compound consisting of sodium cation (Na+) and hydroxide (OH-) anion.
if you wanted to look at a cell wall which type of cell would you observe
Answer:
You could observe the cell wall in all kingdoms except for the animals. That would be cells of plants, protists (algae), fungi, bacteria and achaea.
Explain why heating a liquid causes it to evaporate more quickly.
Answer:
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.
Explanation:
What is the affect of viscosity on the shape of a volcano?
Answer:
the lava viscosity defines the size and shape of a volcano. Even though lava is 100,000 times more viscous than water, it can still flow great distances. When lava has low viscosity, it can flow very easily over long distances. This creates the classic rivers of lava, with channels, puddles and fountains.
........PLEASE HELP........
AS Of Jahuary 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 years of operating 104
nuclear power plants.
On average, how much waste is produced by each plant on a monthly basis?
O0.8tons per month
O83.3 tons per month
104 tons per month
O 866.3 tons per month
Waste produced by each plant : 0.8 tons per month
Further explanationGiven
60,000 metric tons of nuclear waste in 60 years of operating 104
nuclear power plants.
Required
Waste produced
Solution
60,000 metric tons=60 years, so in one year :
[tex]\tt \dfrac{60,000}{60}=1000~metric~tons[/tex]
1000 metric tons/year = 83.33 metric tons/month
For each plant :
[tex]\tt \dfrac{83.33}{104}=0.8[/tex]
Answer:
A. 0.8 tons per month
Explanation:
Edge 2020
MULTIPLE CHOICE QUESTION
Gain or Lose
Magnesium (Mg) has 2 valence electrons. Will
the Mg atom gain or lose electrons to form an
ion?
• Elements > 4 valance e-
gain e-
• Elements < 4 valance e-
lose e-
Neither
Lose
Gain
. The compound containing both ionic and covalent bond is
A)AIBr3;
B) Cao
C) MgCl2
D) NH4cl
Explanation:
The compound with both ionic and covalent bonds is Ammonium chloride (NH4Cl).
A 0.85% saline solution is: a.8.5 mL of saline added to 91.5 mL of water b.85 g of NaCl made up to 1,000 mL of water c.0.85 g NaCl made up to 100 mL of water d.8.5 g NaCl in 100 mL of water
Answer:
c
Explanation:
A 0.85% saline solution would consist of 0.85 g NaCl made up to 100 mL of water.
A 0.85% saline solution contains 0.85% by weight of NaCl. Hence, in order to prepare such a solution, 0.85 g of NaCl is weighed out into a beaker or cylinder and distilled water is added up to the 100 mL mark. On the other hand, 8.5 g of the NaCl can be weighed out and then distilled water added to 1000 mL mark.
The correct option is, therefore, c.
A student builds an electromagnet using a battery and coiling wire around a nail. The student observes that the electromagnet attracts pins.
Answer:
A
Explanation:
A
determine the energy associated with an e- in hydrogen at n=2 to n=4
Answer:
Kinetic energy of electron = -E₂ = 3.4 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Explanation:
In case of hydrogen atom energy associated with nth state is,
En = -13.6/n²
For n = 2
E₂ = -13.6 / 2²
E₂ = -13.6/4
E₂ = -3.4 ev
Kinetic energy of electron = -E₂ = 3.4 ev
For n = 4
E₄ = -13.6 / 4²
E₄ = -13.6/16
E₄ = -0.85 ev
Kinetic energy of electron = -E₄ = 0.85 ev
need help with these three questions!!!
Answer:
6. In order from left to right the balanced coeficcients are,
6, 1, 2, 3
8. [tex]C_{7}H_{10}_{(l)}+6H_{(g)}=C_{7}H_{16}_{(l)[/tex]
9. In order from left to right the balanced coeficcients are,
1, 11, 7, 8
For the nitrogen fixation reaction 3H2(g) + N2(g) = 2NH3(g),
Kc = 6.0 x 10-2 at 500°C. If 0.253 M H2 and 0.044 M NH3 are
present at equilibrium, what is the equilibrium concentration
of N2?
The equilibrium concentration of N₂ : 1.992
Further explanationGiven
Kc = 6.0 x 10⁻² at 500°C
0.253 M H₂ and 0.044 M NH₃
Reaction
3H₂(g) + N₂(g) = 2NH₃(g)
Required
The equilibrium concentration of N₂
Solution
Kc for the reaction :
[tex]\tt Kc=\dfrac{[NH_3]^2}{[H_2]^3[N_2]}\\\\0.06=\dfrac{0.044^2}{0.253^3\times [N_2]}\\\\(N_2]=1.992[/tex]
1. What volume would be occupied by 2.0 mol nitrogen, N2, gas at 0°C and 1 atm? Volume
Answer:
V = 44.83 L
Explanation:
Given data:
Volume of nitrogen gas = ?
Number of moles = 2.0 mol
Temperature = 0°C
Pressure = 1atm
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
0+273 = 273 K
1 atm× V = 2.0 mol × 0.0821 atm.L/mol.K × 273K
1 atm× V = 44.83 atm.L
V = 44.83 atm.L / 1 atm
V = 44.83 L
The temperature of an object is directly related to
A.
the mass of the object.
B.
the motion of its particles.
C.
the potential energy of its chemical bonds.
D.
the volume of the object.
Answer:B
Explanation:Because when the object heats up the particles move faster and it will turn into a liquid or gas but if it is being cooled then the particles will slow down and either make a liquid or solid.
Need help with this.
Answer:
18.2 g.
Explanation:
You need to first figure out how many moles of nitrogen gas and hydrogen (gas) you have. To do this, use the molar masses of nitrogen gas and hydrogen (gas) on the periodic table. You get the following:
0.535 g. N2 and 1.984 g. H2
Then find out which reactant is the limiting one. In this case, it's N2. The amount of ammonia, then, that would be produced is 2 times the amount of moles of N2. This gives you 1.07 mol, approximately. Then multiply this by the molar mass of ammonia to find your answer of 18.2 g.
When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs. Hydrogen + Oxygen → Water + Energy Substances that form as a result of a chemical reaction are called catalysts catalysts products products precipitates precipitates reactants
Answer:
products
Explanation:
In chemistry, chemical reactions is the combination of two or more substances to yield other substances. The substances that react is called REACTANTS while the substances formed after the reaction is called PRODUCTS.
According to this question, a mixture of oxygen and hydrogen is ignited in a test tube as follows:
Hydrogen + Oxygen → Water + Energy
In this reaction, the substances being combined (usually found on the left side of the equation) are hydrogen and oxygen. Hence, oxygen and hydrogen are REACTANTS. Also, the substances produced as a result of the reaction is water (H2O). The PRODUCTS of the reaction is WATER.
Answer:
Soy isk polq ja uso??
Explanation:
Na uend qoaki uwsh.. aju qah!
Which substance is the limiting reactant when 12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide according to the following chemical equation?
NaOH is the limiting reactant
Further explanationGiven
12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide
Required
The limiting reactant
Solution
Reaction
2 S(s) + 3 O₂(g) + 4 NaOH(aq) ⇒ 2 Na₂SO₄(aq) + 2 H₂O(l)
mol S(MW=32.065 g/mol) :[tex]\tt \dfrac{12}{32.065}=0.374[/tex]
mol O₂(MW=32 g/mol)[tex]\tt \dfrac{18}{32}=0.5625[/tex]
mol NaOH(MW=40 g/mol)[tex]\tt \dfrac{24}{40}=0.6[/tex]
A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and the smallest ratio becomes a limiting reactant
S : O₂ : NaOH =
[tex]\tt \dfrac{0.374}{2}\div \dfrac{0.5625}{3}\div \dfrac{0.6}{4}=0.187\div 0.1875\div 0.15\Rightarrow NaOH~smallest~ratio[/tex]
When carbon is completely combusted in the presence of oxygen the only product produced is carbon dioxide as shown in the following equation, C+O2——>CO2 If 12 grams of carbon are burned, how many grams of carbon dioxide will be produced?
Answer:
C.44g is that one okkkkkkkkkkkkkkkk
