Answer:
a
Explanation:
High exposure to mercury is indicated by a blood level above 10 mg/L. How many mercury atoms are in a liter of blood that contains 10 mg mercury?
Answer:
3.0x10¹⁹ atoms
Explanation:
First we convert 10 mg of mercury into grams:
10 mg / 1000 = 0.01 gThen we convert 0.01 g of mercury into moles, using its molar mass:
0.01 g ÷ 200.59 g/mol = 4.99x10⁻⁵ molThen we convert moles into number of atoms, using Avogadro's number:
4.99x10⁻⁵ mol * 6.023x10²³ atoms/mol = 3.0x10¹⁹ atomsWhat is the percent composition of Mg in the compound Mg3(PO4)2?
Question 8 options:
A. 23.57%
B. 21.92%
C. 27.74%
D. 32.32%
Answer:
c
Explanation:
trust me its reasonanle
Per cent composition of Magnesium (Mg) in Magnesium Phosphate compound ie [tex]Mg_3(PO_4)_2[/tex] is 27.74%. Hence, option C is correct.
What is per cent?Percent is from the Latin adverbial phrase per centum meaning “by the hundred.”
Determination of the percentage composition of Mg in Mg₃(PO₄)₂
Molar mass of Mg₃(PO₄)₂ = 262 g/mol
Mass of Mg in Mg₃(PO₄)₂ = 24×3 = 72 g
Percentage composition of Mg =?
[tex]Percentage = \frac{Mass \;of \;elements x 100}{Mass \;of \;compound}[/tex]
[tex]Percentage = \frac{72 X 100}{262}[/tex]
27.74%.
Hence, option C is correct.
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A wildfire destroys most of the plant life in a forest. What would most likely happen to the animals that lived in the forest?
Answer:
They would be pushed out and lose their homes
Explanation:
A wildfire destroys most of the plant life in a forest. Animals would be pushed out and lose their homes.
What is wildfire?An unplanned, uncontrolled, and unpredictable fire inside an area of flammable vegetation is known by several names, including wildfire, bushfire, bushfire, wildland fire, and rural fire. A wildfire may be more precisely referred to by the terms bushfire, desert fire, forest fire, hill fire, peatland fire, prairie fire, vegetable fire, or veld fire, depending on the kind of vegetation that is present.
Wildfires are separate from controlled and prescribed burning, which is a good human use of wildland fire, even though controlled burns have the potential to turn into wildfires. Wildfires likely started shortly after terrestrial plants first appeared, which occurred in the Silurian epoch 419 million years ago, according to fossil charcoal. A wildfire destroys most of the plant life in a forest. Animals would be pushed out and lose their homes.
Therefore, animals would be pushed out and lose their homes.
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Please help will mark brainliest!! What is the main point of paragraph 3?
Answer:
the highest frequency
Explanation:
1 When 25 cm of 1.0 mol/dmº copper sulfate solution was mixed vith an excess of zinc
powder, the temperature of the solution rose by 50.6 °C. Calculate the energy change
for the reaction in kJ/mol.
CuSO4(aq) + Zn(s) + Cu(s) + ZnSO4(aq)
?
Answer:
See explanation
Explanation:
From the formula for heat;
q (enthalpy change) = (mass of solution) x (specific heat capacity) x (temperature change)
Since the density and heat capacity of the solution are the same as that of pure water.
Mass of copper sulphate solution = 50 g
Heat = 50 * 4.18 * 50.6°C
Heat = 10575.4 J
Number of moles = 1 * 25/1000 = 0.025 moles
10575.4 J/ 0.025 moles = 432016 J/mol/1000
= 423 KJ/mol
or
q = - 423 KJ/mol
Determine the expected mass of the copper after 24 hours
The expected mass of copper element after 24 hours as per graph is 288 grams.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.In every 10 minutes 2 mg of copper is produced thus after 24 hours that is 1440 minutes copper amount will be 1440×2/10=288 mg.
Thus, the expected mass of copper element after 24 hours as per graph is 288 grams.
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Molar Mass:
Find the molar masses of the following compounds. Also report the number of atoms in the compound:
1) NaBr
2) PbSO4
3) Ca(OH)2
4) Na3PO4
5) (NH4)2CO3
6) C6H12O6
7) Fe3(PO4)2
8) (NH4)2S
9) Zn(C2H3O2)2
10) AgF
Answer:
Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.
Explanation:
We study the various atomic models in our course of study because, it is important for us to know, how did people come to the present concept of an atom. How did physics evolve from classical to quantum physics.
All these are important for us to know and thus, knowledge about various atomic models, their discoveries and drawbacks and finally improvements based on scientific evidence present at that time is important for us to understand the underlying theory very well.
Explanation:
A DAY IN THE LIFE OF METIS JOURNAL. I WROTE IT HOPE U LIKE IT XD
We, who live in the west, were Nomadic. So we always moved from place to place to hunt buffalo and other fur-bearing animals. And now again we have to shift everything we collected , like, all the essential needs we collected. It’s really hard to shift stuff, But when you move to a new place you get to see new beautiful places. They are just so satisfying to see! It’s like all my work(like the shifting work) is paid off. I love it! We always meet the Hudson’s bay company employees, and give them furs which we took from the bissons and other furry animals we hunted. And in exchange they give us their (Hudson’s Bay company) goods. Which is good! Because then we or I won't be able to enjoy that delicious pemmican!
The one reason that makes me proud of my parents is that because of them I am like a translator for both sides in the fur trade! Anyways coming back to the present. As I said before, we were moving today to another place, But on the way some people along with my father will ride the famous York boats carrying supplies to fur posts. I begged my father to take me with him! And as usual he gave me some silly reason for me to stay. And now since I don’t have anything to do I will-..Nevermind, My mom’s calling me. Okay after helping my mom keep the fur posts into the York boats me , my mom, and the others are just relaxing and enjoying nature just to take a break. Since, I am so obsessed with my Journal notebook today I’m just going to sit here and right what comes to my mind. I’m not like the others who always seem to be talking with someone. I like my own space!
I kind of miss my dad already, but he and his fellow members need to travel the waterways from the red river further west and north to hudson bay. These red river carts also travel the trek back and forth over land to St. Paul, Minnesota and to posts in saskatchewan. Speaking about the red river, the only large settlement in the region is the red colony. About 12000 people lived in this colony around Fort Garry. Some were the original Selkirk settlers or their descendents. They had come from Scotland with lord Selkirk when he established the colony in 1811. Many of these original settlers were poor farmers who had been displaced from their lands in scotland. They had endured many hardships in the early years of settlement, including foods, hunger, and sickness. I love studying about other colonies, cultures , history etc.
How are beef and gas productions related to methane levels?
Plzzz answer quick
Answer:
Cows and other ruminant animals (like goats and sheep) emit methane, a potent greenhouse gas, as they digest grasses and plants. This process is called “enteric fermentation,” and it's the origin of cows' burps.
Explanation:
Excessive use of chemical fertilizer cause chemical pollution.How?
Explanation:
Chemical fertilizers raise crop yields, but their heavy usage has hardened the soil, diminished fertility, reinforced pesticides, contaminated air and water, and emitted greenhouse gases, posing health and environmental risks.
if 13 moles of Fe react, what is the mass of FeS produced?
Answer:
1144 g of FeS
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Fe + S —> FeS
From the balanced equation above,
1 mole of Fe reacted to produce 1 mole of FeS.
Therefore, 13 moles of Fe will also react to produce 13 moles of FeS.
Finally, we shall determine mass of 13 moles of FeS. This can be obtained as follow:
Mole of FeS = 13 moles
Molar mass of FeS = 56 + 32
= 88 g/mol
Mass of FeS =?
Mass = mole × molar mass
Mass of FeS = 13 × 88
Mass of FeS = 1144 g
Therefore, 1144 g of FeS were obtained from the reaction.
Which organ detects stimuli from the environment and is part of the nervous system?
Group of answer choices
A. eye
B. stomach
C. heart
D. lungs
It's the eye because it's the organ of sight
How many grams of oxygen are required to burn 13.5 g of acetylene
Answer:
41.54 grams of oxygen are required to burn 13.5 g of acetylene
Explanation:
The balanced reaction is:
2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₂H₂: 2 moles O₂: 5 moles CO₂: 4 moles H₂O: 2 molesBeing the molar mass of the compounds:
C₂H₂: 26 g/moleO₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₂H₂: 2 moles* 26 g/mole= 52 gramsO₂: 5 moles* 32 g/mole= 160 gramsCO₂: 4 moles* 44 g/mole= 176 gramsH₂O: 2 moles* 18 g/mole= 36 gramsYou can apply the following rule of three: if by stoichiometry 52 grams of acetylene react with 160 grams of oxygen, 13.5 grams of acetylene react with how much mass of oxygen?
[tex]mass of oxygen=\frac{13.5 grams of acetylene*160 grams of oxygen}{52 grams of acetylene}[/tex]
mass of oxygen= 41.54 grams
41.54 grams of oxygen are required to burn 13.5 g of acetylene
how do i break my leg
Answer:
why would u want 2?
Explain in the comments why.
If 5 moles of sugar was added to a kilogram of water, the new boiling point would be _____ degrees C.
Write your answer to the nearest hundredth.
Answer: 102.56
Explanation: I just took the K12 test and this is my answer.
3. Describe the process behind how students recover an individual's remains from a surface grave.
Answer:
By using the techniques of archeology.
Explanation:
Students recover an individual's remains from a surface grave by using the techniques of archeology field to scrape away the layers of soil from that remains in a way that the remains can't be damaged. If they find the remains within 10 centimeters of digging, they can dig down further in order to dig out all the remains safely. The instruments of archeology field are used because they are light and can be used to dig out fossils of ancient organisms.
Why is it important to know characteristics that matter undergoes in chemistry? How can we analyze the relationships between chemical and physical changes and properties?
Extension Questions: What is the study of Chemistry? Who are some of the important people who have contributed to the field? How do regular Americans interact with Chemistry around them?
How can we understand the historical development of the Periodic Table and apply its predictive power?
Extension Questions: Describe different chemical principles and systems. How does the layout of the periodic table allow you predict other element's properties? Consider all types and groups of elements.
Why is it important to know and understand the historical development of atomic theory?
Extension Questions: How does the atom relate to the elements of the periodic table? What are your most common models and how do they relate to the current atomic model? What theories don’t hold true today if any?
How do atoms combine to form ionic, covalent, and metallic bonds?
How can we write and balance chemical equations using the law of conservation of mass?
Answer:
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
What is the application of flotation
Answer:
The law of floatation is applied in all vessels which travel by waterways that include ships, submarines and ferry boats. It is also applied in some vessels which travel by air ways such as hot air balloon and air ship. Balloons of different colors and shapes are filled with lighter gas so that will float in air.
Answer:
*hot air balloon
*swimming
Explanation:
sna makatulong po:)
What animal did this person tes
on to see if the air was pure
nitrogen?
Answer:
DONT CLICK THAT LINK THAT'S A SCAM AND A VIRUS PLEASE LISTEN
Explanation:
Kidneys remove what kind of waste from the body? A. Undigested food B. Carbon dioxide C. Oxygen D. Nitrogen waste
Answer:
Option D: nitrogen waste
Explanation:
Excretion.
This is removal from of waste products of chemical reactions. It involves the eliminating excess water and salts taken in with our human diet and also spent hormones
Nitrogenous waste products are the human waste products which contain nitrogen and are poisonous to the body.
The kidneys is responsible for the remove of Nitrogenous waste, water, salts, toxins, hormones e. t. c. It is the are the main principle excretory organs. They maintain the constant concentration of materials in the body.
Titanium is a transition metal used in many alloys because it is extremely strong and lightweight. Titanium tetrachloride (TiCl4) is extracted from titanium oxide using chlorine and coke (carbon). TiO2(s) + C(s) + 2 Cl2(g) TiCl4(s) + CO2(g) (a) What mass of Cl2 gas is needed to react with 1.60 mol TiO2? g (b) What mass of C is needed to react with 1.60 mol of TiO2? g (c) What is the mass of all the products formed by reaction with 1.60 mol of TiO2? g
Answer:
a) 226.6 grams of Cl₂
b) 19.2 grams of C
c) 303.2 grams of TiCl₄ and 70.4 grams of CO₂
Explanation:
The balanced chemical reaction is the following:
TiO₂(s) + C(s) + 2 Cl₂(g) → TiCl₄(s) + CO₂(g)
(a) What mass of Cl₂ gas is needed to react with 1.60 mol TiO₂?
From the chemical equation, 1 mol of TiO₂ reacts with 2 moles of Cl₂. So, the stoichiometric ratio is 2 mol Cl₂/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of Cl₂ we need:
1.60 mol TiO₂ x 2 mol Cl₂/1 mol TiO₂ = 3.2 mol Cl₂
Now, we convert from moles to mass by using the molecular weight (MW) of Cl₂:
MW(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol
mass of Cl₂= 3.2 mol x 70.8 g/mol = 226.6 g
Therefore, 226.6 grams of Cl₂ are needed to react with 1.6 mol of TiO₂.
(b) What mass of C is needed to react with 1.60 mol of TiO₂?
From the chemical equation, 1 mol of TiO₂ reacts with 1 moles of C(s). So, the stoichiometric ratio is 1 mol C/1 mol TiO₂. We multiply this ratio by the moles of TiO₂ we have to calculate the moles of C(s) we need:
1.60 mol TiO₂ x 1 mol C(s)/1 mol TiO₂ = 1.60 mol C(s)
So, we convert the moles of C(s) to grams as follows:
MW(C) = 12 g/mol
1.60 mol x 12 g/mol = 19.2 g C(s)
Therefore, a mass of 19.2 grams of C is needed to react with 1.60 mol of TiO₂.
(c) What is the mass of all the products formed by reaction with 1.60 mol of TiO₂?
From the chemical equation, we can notice that 1 mol of TiO₂ produces 1 mol of TiCl₄ and 1 mol of CO₂. So, from 1.60 moles of TiO₂, 1 mol of each product will be produced:
1 mol TiO₂/1 mol TiCl₄ ⇒ 1.60 mol TiO₂/1.60 mol TiCl₄
1 mol TiO₂/1 mol CO₂ ⇒ 1.60 mol TiO₂/1.60 mol CO₂
Finally, we convert the moles to grams by using the molecular weight of each compound:
MW(TiCl₄) = 47.9 g/mol Ti + (35.4 g/mol x 4 Cl) = 189.5 g/mol
1.60 mol x 189.5 g/mol = 303.2 g
MW(CO₂) = 12 g/mol C + (16 g/mol x 2 O) = 44 g/mol
1.60 mol x 44 g/mol = 70.4 g
Therefore, from the reaction of 1.60 mol of TiO₂ are formed 303.2 grams of TiCl₄ and 70.4 grams of CO₂.
plzzzz helppp i will cryy :(
Answer:
okay you need to find the synnomy
Pl help it’s for a grade and I can’t find it
Answer:
personally I think it's a but it could also be D.
But yeah personally I would say A
In the atmosphere, it is more common to find two oxygen molecules joined together than to find a single atom of oxygen. Why? What would that molecule look like? What would this molecule be called?
Answer:
See explanation
Explanation:
Oxygen has six electrons in its outermost shell. This means that its octet can be completed when it shares two electrons with another oxygen atom.
In a covalent bond, each bonding atom contributes one electron to the bond. This means that four electrons are shared between two oxygen atoms. Each atom contributes a total of two electrons which are shared. This molecule of oxygen satisfies the octet rule rather than a single atom of oxygen.
An image of the oxygen molecule is attached to this answer.
This system of two oxygen atoms joined together in a covalent bond is called an oxygen molecule(O2).
Which is the correct answer?
Explain why the temperature of the water decreased when the cold water was added to the hot water
Answer:
The water is clearly close to boiling temperature when you add the ice. So, initially the ice cools the water that is near it to near 0degC. Water between about 0 and 8 degrees is more dense than hotter water, so the cold water sinks to the bottom.Jun 14, 2020
Hope this helps if so don't hesitate to 'Thanks' and/or 'brainliest' this answer!
Answer:
hot water has more melting point
Explanation:
hot water has more melting point
hot water cpyld be boiled
what are things than can circulate
A tall plant (Tt) is crossed with a short plant (tt). What percent will be short?
Group of answer choices
75%
0%
100%
50%
25%
it should be 50/50 percent
so 50%
hopefully this is right !
What is a fault, and how does the existence of faults support the theory of plate tectonics?
“Many of the objections are long standing but apparently unknown to many geophysicists, while some are peculiar to the new global tectonics. The conclusions drawn, in order of probability, are (1) the continents have almost certainly not moved with respect to each other; (2) convection is not active throughout the whole mantle; (3) even if convection is active in the upper mantle it cannot account for drift; (4) pole positions derived from paleomagnetism, and results of this method of investigation in its global form generally, are afflicted with an unknown cause of error and are in any case too inexact for drift reconstructions.”
(Wesson, 1972)
I’ll really appreciate it if you help me out with these 2 questions .
During photosynthesis, plants change light energy into:
chemical energy
solar energy
mechanical energy
electrical energy
i will mark brainlest
Answer:
chemical energy
Explanation:
just put that
Answer:
chemical energy
Explanation:
it is the light dependent reaction
