Answer:
29/43
Explanation:because of the numbers
Na-23 has 11 protons.How many neutrons does it have?
this is how you find it:
23-11=12
the 12 is the amount of neutrons
Why does the shape of the moon appear to change over the course of about a month? (2 points)
Group of answer choices
The sun is always lighting up the same amount of the moon.
The sun is lighting up different amounts of the moon.
The moon changes sh
Answer:
The sun is lighting up different amounts of the moon.
Explanation:
Which organisms are consumers?
Choose all correct answers.
Mushrooms
Snake
Frog
Grasshopper
Monkey
Grass
Answer:
Snake
Frog
Grasshopper
Monkey
Mushroom
What mass of copper is used to produce 2.87 moles of copper (II) oxide?
The answer is 182 but I don't know why
Answer:
182.532 [gr.].
Explanation:
1) equation of this reaction is:
2Cu+O₂⇒2CuO;
2) according to the equation made up above, ν(CuO)=ν(Cu); it means ν(Cu)=2.87 (mol.), then
3) m(Cu)=ν(Cu)*M(Cu);
m(Cu)=2.87*63.6=182.532 [gr].
when water becomes tasty it is called?
Answer:
sour ??
Explanation:
Which of the following are examples of useful hydrocarbons?
Answer:
the most useful hydrocarbon is fuel.
Explanation:
some examples like: natural gases,coal,diesel fuel, kerosene etc.
The most useful hydrocarbon is fuel like gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane.
What are hydrocarbons ?The term hydrocarbon is defined as the compound which is made up of hydrogen and carbon. They are useful as energy sources. Hydrocarbons are examples of group 14 hydrides.
There are four types of hydrocarbon that are alkanes, alkenes, alkynes and aromatic hydrocarbons.
Among the most widely used hydrocarbon fuels include gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane. Plastics and synthetic fabrics like polyester are made using hydrocarbons as well.
Thus, The most useful hydrocarbon is fuel like gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane.
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True or False - Elemental gases are relatively insoluble in water and should be given the state (g).
Answer:
True
Explanation:
I assume this is refering to gases such as O2, H2, I2, F2, ect. And possibly the nobel gases which are completly insoluable. As gases they should be given the state (g).
Elemental gases are relatively insoluble in water and should be given the state (g). The given statement is true.
An example of elemental gas is Helium (He).
Helium belongs to the class of noble gases, these elements are defined by their low reactivity, also as gases, they do not have color or odor. Helium is part of this group that contains other 5 elements because Helium characteristics are similar to other noble gases, indeed this is the first noble gas in the periodic table. Additionally, helium is an abundant element found in all the universe especially in stars. Helium gas is used to fill balloons.
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What is the equivalent weight of water
Answer:
Atomic weight of Hydrogen is 1. There are 2 Hydrogen atoms in water molecule. So it is 2. Oxygen atomic weight is 16.0 and adding 2 and 16, we will get 18.18 is the equivalent weight of water.
Explanation:
Hope this helps
___Cu2S (s) + ___O2 (g) → ___Cu (s) + ___SO2 (g)
A. Balance the chemical equation above.
B.hat type of reaction is/are being represented by the chemical reaction in part (a)?
Answer:
(a)Cu2S(s) + O2(g) --> 2Cu(s) + SO2(g)
(b) single displacement reaction
A sample of carbon monoxide gas is contained in a 345 mL vessel at a temperature of 25 °C. and a pressure of 985 mm
Hg. The gas is allowed to expand to a new volume of 4.50 liters at constant temperature. What is the new pressure? 1 atm
= 760 mm Hg.
The new pressure is 75.51 mmHg if a sample of carbon monoxide gas is contained in a 345 mL vessel at a temperature of 25 °C. and a pressure of 985 mmHg and the gas is allowed to expand to a new volume of 4.50 litres at a constant temperature.
What is a gas law?The gas laws consist of three primary laws: Charles' Law, Boyle's Law and Avogadro's Law (all of which will later combine into the General Gas Equation and Ideal Gas Law).
The pressure on the gas changes, while the temperature remains constant, and we want to find the new volume. So, we will use Boyle's Law, which states there is an inverse relationship between the pressure on a gas and the volume of the gas. The formula is:
[tex]P_1V_1=P_2V_2[/tex]
[tex]P_1 = 985 mm Hg[/tex]
[tex]V_1 = 345 mL[/tex] =
[tex]P_2 = ?[/tex]
[tex]V_2 = 4.50 liters[/tex]
The pressure of the gas is originally 985 mm Hg and the volume is 345 mL.
We are solving for the new volume, so we must isolate the variable V₂.
Now putting all the values in the equation:
[tex]P_1V_1=P_2V_2[/tex]
[tex]985 X 0.345 L=P_2 X 4.50[/tex]
[tex]P_2[/tex] = 75.51 mmHg
Hence, the new pressure is 75.51 mmHg.
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The energy diagram shows the changes in energy during a chemical reaction.
Which statement best describes the total energy change of the system?
Potential energy
M
Reaction progress
O A. The reactants have higher potential energy, and energy is released.
O B. The reactants have lower potential energy, and energy is released.
O C. The reactants have lower potential energy, and energy is
absorbed.
O D. The reactants have higher potential energy, and energy is
absorbed.
There is no diagram attached but there are some ways by which you can find it too easily by yourself
Usually energy diagram uses ∆H .
So
If ∆H is +ve means reaction is exothermic and energy is releasedIf ∆H is -ve means reaction is endothermic and energy is absorbedSo observe∆H whether it. is decreasing or increasing ,
If increasing then energy is being released and vice versaWhen was electricity invented?
Answer:In 1752
Explanation:Benjamin franklin in 1752 to prove that lightning was electrical,he flew a kite during a thundorstorm.He tied a metal key onto the string and as he suspected it would ,electrically from the storms clouds flowed down the string ,which was wet and he received an electrical shock.
Electricity was discovered and understood by many scientists. Benjamin Franklin is given the credit for discovering electricity. In the year 1752, Benjamin Franklin conducted an experiment using a kite and key on a rainy day.
A sodium chloride solution with a Molarity of 0.239 M has a volume of 158 mL. How many grams
of solute are in the solution?
Answer:
2.21 grams
Explanation:
The first thing you need to do is find the chemical formula for sodium chloride which is NaCl (Molar mass: 58.44 g/mol).
The next the thing to do is to convert the mL to L by dividing by 1000 which will give us 0.158 L.
Now we look at the molarity formula M = n/L, plug in the molarity for M and the liters for L. 0.239 M (mol/L) = n/0.158 L.
Solve for n to get the number of moles of NaCl in the solution. You should get 0.037762 moles.
Then we have to multiply this by the molar mass of NaCl, (0.037762 mol)*(58.44 g/mol).
Moles cancel and when we round to sig figs we are left with 2.21 grams.
Hope this helps.
A mixture of hydrogen (2.02 g) and chlorine (35.90 g) in a container at 300 K has a total gas pressure of 748 mm Hg. What is the partial atmospheric pressure (atm) of hydrogen in the mixture?
The partial atmospheric pressure (atm) of hydrogen in the mixture is 0.59 atm.
How do we calculate the partial pressure of gas?Partial pressure of particular gas will be calculated as:
p = nP, where
P = total pressure = 748 mmHgn is the mole fraction which can be calculated as:n = moles of gas / total moles of gasMoles will be calculated as:
n = W/M, whereW = given massM = molar massMoles of Hydrogen gas = 2.02g / 2.014g/mol = 1 mole
Moles of Chlorine gas = 35.90g / 70.9g/mol = 0.5 mole
Mole fraction of hydrogen = 1 / (1+0.5) = 0.6
Partial pressure of hydrogen = (0.6)(748) = 448.8 mmHg = 0.59 atm
Hence, required partial atmospheric pressure of hydrogen is 0.59 atm.
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How can glass be a liquid if it's so hard?
Answer:
It is an amorphous solid and hence also called pseudo solid. So it flows very slowly over thousands of years. It is not visible to the n*ked eye.
PLEASE HELPPPP ASAPPPPPP!!!!!!!
Answer:
that the oxygen atom is not equal on both sides
Explanation:
Thus the reaction is not balanced.
How many mL of 2.52 Macid does it take to titrate 1,527mL of 5.09 M base?
[tex]thanks \: for \: points[/tex]
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CARRYONLEARNINGWhich experiment led to the idea that atoms contained a nucleus?
O A. Niels Bohr's photoelectric effect experiment
O B. Ernest Rutherford's gold foil experiment
O C. J. J. Thomson's cathode ray experiment
O D. Robert Millikan's oil drop experiment
Answer:
B. Ernest Rutherford's gold foil experiment
Explanation:
That experiment showed a space with the tiny dense spot, referred to as the nucleus. The experiment involved shooting alpha particles (helium nuclei) at a very thin sheet of gold and then observing.
13 a plant will start to wilt/sprout without sunlight
Answer:
wilt
Explanation:
Without sunlight, photosynthesis cannot occur, and photosynthesis makes chlorophyll, the plant's food. Therefore, a plant without sunlight will "starve," and begin wilting.
Answer:
it will true
Explanation:
ITS DUEEE brainliest+15 points place plastic wrap infrony of a flashlight what do you observe? after that place wax paper in front of the flashlight Does the waxed paper affect how the light hits the paper on the wall? Explain your response.
Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
What is Reflection ?
Reflection of light occurs when light hits a smooth surface that does not absorb any of the light but instead bounces it back off the surface.
A mirror is flat, smooth, and polished. When light hits a mirror it is not absorbed but is reflected off at a very predictable angle.
The angle that the light hits the mirror is called the angle of incidence.
The angle of light that bounces off the mirror is called the angle of reflection.
The Law of Reflection states that the angle of incidence is equal to the angle of reflection.
Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
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When will the pain end?
Answer:
(when you get a girl)
Pain is a sensory trigger from your brain to represent the fact that something —or someone— could be hurting you. The pain will end once the thing causing it stops, as in a cause-effect scenario.
Mental health though, can be helped by finding happiness in life, like getting off of clash of clans and touching grass.
(50 points) A chemist reacted 15.0 liters of F2 gas with NaCl in the laboratory to form Cl2 and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
F2 + 2NaCl → Cl2 + 2NaF
Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP.
A. The mass of NaCl needed to react with F₂ at 280 K and 1.50 atm is 115.83 g
B. The mass of NaCl needed to react with F₂ at STP is 78.39 g
A. How to determine mass of NaCl needed at 280 K and 1.50 atmWe'll begin by calculating the number of mole of F₂ by using the ideal gas equation as follow:
Volume (V) = 15 LTemperature (T) = 280 KPressure (P) = 1.5 atm Gas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?n = PV / RT
n = (1.5 × 15) / (0.082 × 280)
n = 0.98 mole
Next, we shall determine the number of mole NaCl that reacts. This is given below
F₂ + 2NaCl → Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
Therefore,
0.98 mole of F₂ will react with = 0.98 × 2 = 1.96 moles of NaCl
Finally, we shall determine mass of NaCl as follow
Mole of NaCl = 1.96 molesMolar mass of NaCl = 58.5 g/mol Mass of NaCl =?Mass = mole × molar mass
Mass of NaCl = 1.98 × 58.5
Mass of NaCl = 115.83 g
B. How to determine mass of NaCl needed at STPAt standard temperature and pressure (STP),
22.4 L = 1 mole of F₂
Therefore,
15 L = 15 / 22.4
15 L = 0.67 mole of F₂
Next, we shall determine the number of mole NaCl that reacts. This is given below
F₂ + 2NaCl → Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
Therefore,
0.67 mole of F₂ will react with = 0.67 × 2 = 1.34 moles of NaCl
Finally, we shall determine mass of NaCl as follow
Mole of NaCl = 1.34 molesMolar mass of NaCl = 58.5 g/mol Mass of NaCl =?Mass = mole × molar mass
Mass of NaCl = 1.34 × 58.5
Mass of NaCl = 78.39 g
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Plants such as _______________ provided much nitrogen to the soil.
Answer:
Abiotic
Explanation:
Its because it includes water, sunlight, tempature and soil
are sedimentary rocks formed weathering erosion and deposition?
Answer:
yes
Explanation:
sedimentary rocks are mad from erosion and weathering!
weathering erosion and deposition occur to form every sedimentary rock that exist on Earth weathering is the creation of sediment through its supposed to wind or water tearing off pieces or do I survive a logical activity such as tree roots and animal hooves breaking at rock erosion is the transportation of the sediments from origin to deposition through wind water or glacial ice deposition is the process of the sediments being dropped off by their mode of movement or erosion method by glacial ice when are water.
You are standing outside in a rural area at night, looking up to the sky and observe many stars. If you were to look up to the sky in the city on that exact same night, what would you observe? (2 points)
Group of answer choices
That only the street lights shine in the sky
That there appears to be little to no stars in the sky
That there appears to be many stars in the sky
Answer:
That there appears to be many stars in the sky
Explanation: hope this helps! <33333
Hii!
Explain Rutherford's model.
Answer:
Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. This model of an atom was developed by Ernest Rutherford, a New Zealand native working at the University of Manchester in England in the early 1900s
Explanation:
yan na ang exact
Rutherford's atomic model is the model which described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.
Look at the equation. Which is the Brønsted-Lowry base?
Answer:
the answer is H3O+.......
Answer:
H₂O
Explanation:
A Brønsted-Lowry base accepts protons. As seen in the equation, H₂O gains a proton to become H₃O⁺. It has gained one proton- a hydrogen atom.
C₂H₃O₂⁻ is a conjugate base.
H₃O⁺ is a conjugate acid.
HC₂H₃O₂ is an acid [or a Brønsted-Lowry acid].
Predict the products of each reaction. Balance the equation, and then write the net ionic equation
A chemical equation is an equation showing the formation of new products from reactants.
What is a chemical reaction?A chemical reaction is a reaction which involves changes in the composition and chemical properties of substances resulting in the formation of new substances.
A chemical reaction is usually represented by chemical equations.
A balanced chemical equation is one in which the atoms of elements are equal on both sides of the equation.
A net ionic equation shows only the ions that form products.
Therefore, a chemical equation is an equation showing the formation of new products from reactants.
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Which statement(s) about neutrons is/are TRUE?
SELECT ALL THAT APPLY
The major clue to their existence was extra mass in
a atoms that protons and electrons could not
account for.
b They were observed and measured directly, like
protons and electrons were.
C They have the same mass as protons.
d They have a negative charge.
Answer:
C
Explanation:
Because D ask "They have a negative charge" yes and no, but neutrons do, Why? Well because the neutron has a negative charge both in its inner core and its outer edge, with a positive charge sandwiched in between to make the particle electrically neutral. Whilst B is wrong because like protons and electrons they were both measured and observed differently, just as the neutron. So that makes C the only correct answer.
A calorimeter holds 50 g water at 22.0°C. A sample of hot iron is added to the water. The final temperature of the water and iron is 28.0°C. What is the change in enthalpy associated with the change in the water’s temperature?
Note: The specific heat of water is 4.18 J/°C
Use the formula ΔH = - cmΔT
The change in enthalpy associated with the change in the water’s temperature is 1254 J.
What is specific heat?The amount of heat required to increase the temperature of one gram of a substance by one Celsius degree is known as specific heat.
Enthalpy change will be calculated as:
ΔH = -cmΔT, where
m = mass of water = 50g
c = specific heat of water = 4.18J/g°C
ΔT = change in temperature = 28 - 22 = 6 °C
On putting values in the above equation, we get
ΔH = -(4.18)(50)(6) = -1254 J
Hence change in enthalpy of the reaction is -1254 J.
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