Answer:
molecular compound
Explanation:
it has two or more nonmetal elements and are covalently bonded
Americans drink 5,604,000 gallons of sweet tea each day. How many liters is
that? (1 gal = 3.79 L)
5604000gallon =21239160 liters
Which element in row 6 of the periodic table has the largest radius
Answer:
Cesium atomic number 55
In a living organism, the organic material contains 0.22 Bq of 14C per gram of carbon. A sample of charcoal from a campfire contains 0.055 Bq of 14C per gram of carbon. How long ago was this campfire in use? (14C half-life is 5730 yr)
Answer:
6
Explanation:
The age of the charcoal sample in the campfire in use is equal to the time taken for the decay of 0.22 of C-14 to 0.055 Bq. Hence its age is 11552.45 years.
What is radioactive decay?Unstable radioactive isotopes of atoms undergo nuclear decay by the emission of charged particles such alpha or beta particles. Radioactive decay is a first order reaction. Thus, the decay constant is written as:
k = 1/t ln (W0 / Wt)
where W0 be the initial weight and Wt be the weight after time t.
The decay constant is related to the half life time of the sample by the expression:
k = 0.693 / t1/2.
Given that t1/2 of C-14 = 5730 years.
Thus, k = 0.693 /5730 = 0.00012 yr⁻¹.
Now, we can calculate the time t using the first order equation.
t = 1/k ln ln (W0 / Wt)
= [ ln (0.22 Bq/ 0.055 Bq) ] / 0.00012 yr⁻¹
= 11552.4 years.
Therefore, the age of the sample of charcoal is 11552.4 years.
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The mass of 1 mole of phosphorus atoms is how many
grams.
Answer:
approximately 30 g.
The mass of 1 mole of phosphorus atoms is approximately 30 g.
Explanation:
Hope this helps.
Draw a Lewis structure for the following molecules on scratch paper. Then give the number of bonds between the C and N in each.
CH5N
CH3N
HCN
Refer to the attachments
when particles of unreactive .... collide, they bounce off each other at high speed without any loss of energy. What word is supposed to be filled in on the dots?
Answer:
Groups
Explanation:
The groups determine if the atom is reactive or not, take the Noble Gases for example, they are very very very unreactive.
why do ionic compound form crystals ?
Answer:
Ions bound together by electrostatic attraction form ionic crystals.Stability of ionic solids depends on lattice energy, which us released in the form of heat when two ions are brought together to form a solid. Lattice energy is the sum of all the interactions within the crystal.Look at the graph above showing the composition of air. Which component is the solvent?
The component that would be the solvent from the graph would be nitrogen.
From the graph, nitrogen takes up 78%, oxygen had 21%, while the remaining gases take the remaining 1%.
A solvent is a substance or the component of a solution that has the capacity to dissolve other substances
In a mixture consisting of 2 or more substances, the substance with the highest volume usually acts as the solvent.
In this case, nitrogen holds the highest volume of all the gases in the graph. Thus, it can be considered as the solvent while the remaining gases are the solutes.
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Why is land more vulnerable to wind erosion during droughts?
A: Excessive rainfall causes soil to erode.
B: Plants that hold the soil die off.
C: High temperatures dry out the soil.
D: Cold temperatures cause soil to freeze.
Which two substances are among the four major types of organic
compounds made by living things?
A. Potassium
B. Water
C. Carbohydrates
D. Proteins
Answer: Carbs and proteins
Explanation:
Answer:
the answer is proteins
Explanation:
did the problem
In which of Earth's layers are the convection currents?
crust
mantle
inner core
lithosphere
What happens if an atom has a different amount of electrons than protons? (Select all that apply) A: The particle is no longer an atom. B: The particle becomes a different element. C: The particle has a charge. D: The particle is considered an ion.
What will happen in a case there is different number of electrons compare to protons is D: The particle is considered an ion.
An ion can be regarded as atom or molecule which posses some amount of electron more than amount of protons and vice versa. It can be regarded as molecules that has a charge. i.e ( -ve or +ve)When the number of electron in this molecules or atom is more that that of the present protons, then the ion is negatively charged ion.When a particles posses less electron compare to the present protons then the ion is positively charged.
Therefore, an ion can be charged positively and it can be charged negatively
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The RDI for sodium for adults is 2300mg. What amount of table salt (in grams) contains this quantity of sodium? Express answer to two significant figures and include the appropriate units.
The amount of table salt (in grams) contains this quantity of sodium is 5.844 g.
What is table salt?Table salt is made up of sodium and chloride. The chemical formula of table salt is NaCl. This is a common salt used daily in the kitchen. This gives us a taste of food. And it is also necessary for the body.
The RDI for sodium for adults is given that is 2300 mg. The quantity of sodium is given = 2300 mg = 2.30 g (since the answer is asked in grams)
As we know, table salt is NaCl.
The molar mass of table salt (NaCl) is 58.44 g/mol
The molar mass of sodium (Na) is 23.00 g/mol
So, for 23.00 g sodium, we need 58.44 g NaCl.
And, for 2.30 g sodium we require (58.44 g x 2.3 g) / 23 g = 5.844 g = 6 g (to one significant figure).
Therefore, the amount of sodium is present in 5.844 grams of table salt.
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15.3 Determine the mass of the following: 15.3.1. 2 mol calcium atoms
15.3.2. 0,3 mol nitrogen molecules
15.3.3. 0,5 mol table salt
15.3.4. 0,2 mol hydrochloric acid
15.3.5. 0,08 mol sodium carbonate (Na2CO3)
15.3.6. 0,25 mol ammonium sulphate (NH4)2SO4
Answer:
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Explanation:
Can anyone help me with this?
Answer:
Label 2
Explanation:
Earth is about 2/3 of the way up the Orion Arm of the Milky Way Galaxy
How much heat is necessary to 20g of water at 100*C into steam at 100*C?
Answer:
To convert 100.0 g of water at 20.0 °C to steam at 100.0 °C requires 259.5 kJ of energy.
The amount of heat which is required for a phase change of a substance without any change in temperature is known as latent heat. Here the amount of heat required is 10,800 calories.
What is heat capacity?The heat capacity of a substance or a system is defined as the amount of heat required to raise its temperature through 1°C. It is denoted by C. The specific heat capacity is the amount of heat required to raise the temperature of 1 gram of the substance through 1°C.
The equation to calculate the heat required is:
Q = mc (T₂ - T₁) + mL₁
L = Latent heat of vaporization of water
m = mass
c = specific heat capacity
T₂ = Final temperature
T₁ = Initial temperature
T₂ - T₁ = 100 - 100 = 0°C
Q = 20 g × 1 cal /g°C × 0°C + 20 g × 540 cal/g
Q = 10,800 calories
Thus the amount of heat required is 10,800 calories.
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which is a semi conductor? metal, nonmetal, mettaliod
Answer:
mettaliod
Explanation:
Answer:
Metalloids have properties intermediate between the metals and nonmetals. They can form alloys with other metals. … Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors.
Explanation:
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many substance are compound what is a compound
Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
Answer:
A compound is a unique substance that consists of two or more elements combined in fixed proportions.
Explanation:
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is distilled water a pure substance or mixture
Answer:
pure substance,...................
List two differences between a map and a giobe
Answer:
1. A map is two dimensional, while a globe is three dimensional
2. A globe is a scaled down representation of the entire Planet Earth. A map can represent an area of any size.
Explanation:
1. A map is usually a sheet of rectangular paper that is a flattened image of an area as seen from the top. A globe on the other hand is a sphere which is a 3D shape.
2. Earth is in the shape of a sphere, so Globes are a smaller representation of the planet. A map can be for a city, state, country, or the world.
lactase is an enzyme that breaks down a sugar found in dairy products known as lactose. Some people are lactose intolerant, and this can be due to not having enough lactase production. People who are lactose intolerant may not feel well after eating foods containing lactose. Illustrate the scenario and describe the relationship between the substrate and enzyme.
Answer
If people with lactose intolerance eat dairy products, the lactose from these foods pass into their intestines, which can lead to gas, cramps, a bloated feeling, and diarrhea.
Some people can have small amounts of dairy without problems. Others have a lot of stomach trouble and need to avoid all dairy products. Many foods, drinks, and digestive aids are available to help manage lactose intolerance.
Explanation:
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Hello there
i am looking for some quick help on this question thank you.
Liquid B has a mass of 75 g and a volume of 25 ml. What is liquid B's density?
1: .33 g/ml
2: 3 g/ml
3: 75 g
4: 25 ml
Answer:
To measure the density of a liquid you do the same thing you would for a solid. Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container.
Explanation:
Answer:
[tex] \rho = \frac{mass}{vol} \\ = \frac{75 \: g}{25 \: ml} = 3g .{ml}^{ - 1} [/tex]
6. Which of the following statements is/are TRUE of metals and non-metals?
l. Non-metals are heat conductors.
ll.Aluminum, copper and iron are non-metals.
III. Phosphorus and sulfur are poor conductors of heat and electricity
IV. Metals have luster.
A. I only
B. III only
C. III and IV
D. I and II
Answer:
I= true
III=false
iv=true
Which statement is true about a neutral solution?
Its pH is less than 7.
Its pH is greater than 7.
It has the same concentration of hydronium and hydroxide ions.
It has a greater concentration of hydroxide ions than hydronium ions.
Answer:
C. It has the same concentration of hydronium and hydroxide ions.
Explanation:
A neutral solution means that it's a balanced substance that is neither a base nor an acid. For example, pure water is a neutral substance.
(I also did the test for this and I got it correct.)
Hope this helps any future people doing this! :)
Answer:same concentration of hydronium and hydroxide ions (C)
Explanation:
Alkali metals react violently with water. How much Hydrogen gas (in g) is produced when 10.0 g of sodium reacts with excess water according to the following equation?
2Na + 2H2O ----> 2NaOH + H2
The mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
From the question,
We are to determine the mass of Hydrogen gas produced when 10.0g of sodium reacts with excess water.
From the balanced chemical equation for the reaction
2Na + 2H₂O → 2NaOH + H₂
This means
2 moles of sodium reacts with 2 moles of water to produce 2 moles of sodium hydroxide (NaOH) and 1 mole of Hydrogen gas.
Now, we will determine the number of moles of sodium present
Mass of sodium = 10.0 g
Atomic mass of sodium = 22.99 g/mol
From the formula
[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]
∴ Number of moles of sodium present = [tex]\frac{10.0}{22.99}[/tex]
Number of moles of sodium present = 0.43497 mole
From the balanced chemical equation
2 moles of sodium reacts with 2 moles of water to produce 1 mole of Hydrogen gas.
Then,
0.43497 mole of sodium will react with 0.43497 mole of water to produce [tex]\frac{0.43497}{2}[/tex] mole of Hydrogen gas
[tex]\frac{0.43497}{2} = 0.217485[/tex]
∴ 0.217485 mole of Hydrogen gas was produced during the reaction
Now, for the mass of Hydrogen gas produced
Using the formula
Mass = Number of moles × Molar mass
Molar mass of H₂ = 2.016 g/mol
∴ Mass of Hydrogen gas produced = 0.217485 × 2.016
Mass of Hydrogen gas produced = 0.43845 g
Mass of Hydrogen gas produced ≅ 0.44 g
Hence, the mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
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3. What is the picture displayed? *
1 point
Captionless Image
Answer:
(not sure what's the question ) Captionless image??
1.-Una solución de 1600 ml contiene 9,5 gramos de agua oxigenada H2O2 Calcular el porcentaje peso volumen del soluto.
4
Select the correct answer.
Which statement best describes how chemical equations demonstrate conservation of mass?
O A.
The number of reactants is the same as the number of products.
O B.
The compounds are the same on each side of the reaction.
O c.
The number of atoms of each element is the same on each side of the equation.
OD.
The state of matter is the same on each side of the equation.
Answer:
C. The number of atoms of each element is the same on each side of the equation.
Explanation:
[tex].[/tex]
120 g of KI at 0 °C solution is
Answer:
i dont care to you
Explanation:
cause you are tuyo
solution is 9°5
