Answer:
The correct answers are B and C
Work is the only way which energy passes between system and surroundings.
O True
Tree
False
Answer:
true :)
Explanation:
Answer:
Explanation:
The First Law of Thermodynamics Work and heat are two ways of transfering energy between a system and the environment, causing the system’s energy to change. If the system as a whole is at rest, so that the bulk mechanical energy due to translational or rotational motion is zero, then the
Which is the most common category of elements on the periodic table?
A.non-metals B.metalloids C. semi-metals D.metals
Answer:
D.metals
Explanation:
The majority of elements in the periodic table are classified as metals.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option D s correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
The majority of elements in the periodic table are classified as metals. Then the number of non metals come then the metalloids. Metals are kept on the left of the periodic table.
Therefore, the correct option is option D that is metals.
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C5H12() + 502(9)=
5CO2(g) + 6H2(9)
A. Decomposition
B. Combustion
C. Neutralization
D. Precipitation
Can someone pls help me pls
Answer:
Figure 2 is a model of an atom
how many molecules are contained in 201 g of magnesium sulfate heptahydrate?
Answer:
Its not 1.01x10^24
Explanation:
I am not sure why I got it wrong but when I put the answer in, it said it what wrong. Lol do you have Mr.Hays??
Answer:
4.91 • 10^23
Explanation:
201 • 6.02 • 10^23 ÷ 246
i used that formula and go it right i’m also in mr hays class lol .
How many molecules are there? How many elements? 5CO2
Answer:
No number means one atom. For CO2 there is one atom of carbon and two atoms of oxygen. For H2O, there is one atom of oxygen and two atoms of hydrogen. A molecule can be made of only one type of atom.
Explanation:
A molecule is a group of two or more elements held together by chemical bonds. There are 5 molecules and 15 elements are present in the [tex]\bold {5 CO_2 }[/tex].
Molecule:
It is a group of two or more elements held together by chemical bonds. Molecules are electrically neutral.
For example- Carbon dioxide [tex]\bold {CO_2}[/tex], is composed of two elements Carbon and 2 oxygen atoms.
Here, the prefix 5, represents the number of molecules, hence there are 5 molecules of carbon dioxide are present.
So, there are 5 elements of carbon and 10 elements of oxygen. It means a total of 15 elements in the given molecules.
Therefore, there are 5 molecules and 15 elements are present in the [tex]\bold {5 CO_2 }[/tex].
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Caffeine has the molecular formula, C8H10N4O2. What is the percent composition of caffeine?
Select one:
a)33.33% C, 41.67% H, 16.67% N, and 8.33% O
b)49.48% C, 5.19% H, 28.85% N, and 16.48% O
c)25% C, 25% H, 25% N, 25% N, and 25% O
d)27.92% C, 2.34% H, 32.56% N, and 37.19% O
Answer:
b) 49.48% C, 5.19% H, 28.85% N, and 16.48% O
Explanation:
According to this question, caffeine has a molecular formula of C8H10N4O2. In order to find the percentage composition of each element in this compound, we must first find the molar mass of the compound:
C8H10N4O2
Where; C = 12, H = 1, N = 14, O = 16
12(8) + 1(10) + 14(4) + 16(2)
96 + 10 + 56 + 32
194g/mol
Next, we find the percent composition of each element as follows by dividing mass of each element by molar mass of the compound and multiplying by 100
C = 96/194 × 100 = 49.48%
H = 10/194 × 100 = 5.15%
N = 56/194 × 100 = 28.86%
O = 32/194 × 100 = 16.49%
How many moles is 125 g CuO2?
Answer:
1.31moles
Explanation:
Given parameters:
Mass of CuO₂ = 125g
Unknown:
Number of moles = ?
Solution:
To solve this problem, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CuO₂ = 63.6 + 2(16) = 95.6g/mol
So;
Number of moles = [tex]\frac{125}{95.6}[/tex] = 1.31moles
how was crude oil formed
Explanation:
Crude oil is formed from the remains of dead organisms (diatoms) such as algae and zooplankton that existed millions of years ago in a marine environment. As they lived these organisms absorbed energy from the sun and stored it as carbon molecules within their bodies.
What nonmetal gains 3 electrons to be stable like neon?
describe how the human body receives sensory information for the visual system.
please help, i’ll give brainliest answer :)
Answer:
The visual cortex is the largest system in the human brain and is responsible for processing the visual image. It lies at the rear of the brain (highlighted in the image), above the cerebellum. The region that receives information directly from the LGN is called the primary visual cortex, (also called V1 and striate cortex).
Explanation:
hope that helps
Explanation:
tvcfcgcfcfbfvfvfvr vn tbrcrcrcex
WILL GIVE BRAINLIEST!! :)
Nitrogen is a critical component of what organic compounds?
a.) lipids and carbohydrates
b.) lipids and DNA
c.) proteins and carbohydrates
d.) proteins and DNA
Answer:
D
Explanation:
Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.
Nitrogen is a critical component of proteins, which are building blocks and DNA, which are the main genetic material of our body.
What are organic compound?Those compounds which are formed by the combination of carbon, hydrogen, oxygen and nitrogen through covalent bonds are known as organic compounds.
Proteins are the large macromolecules which are present in the human body, formed by the combination of large no. of amino acids and main constituent of this acids is nitrogen. Similarly, DNA is the main genetic material in our body formed by the combination of nucleic acid and its main component is also nitrogen.
Hence, Nitrogen is a critical component of proteins and DNA.
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Help me answer this question
Use the following reaction to answer the question:
Zn + HCl ---> ZnCl2 + H2
2. If you start with 11.89 g of zinc, how many grams of HCl would you need to react with all of the zinc?
Answer:
Mass = 13.14 g
Explanation:
Given data:
Mass of zinc = 11.89 g
Mass of HCl needed = ?
Solution:
Chemical equation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = mass/molar mass
Number of moles = 11.89 g/ 65.38 g/mol
Number of moles = 0.18 mol
Now we will compare the moles of Zn and HCl.
Zn : HCl
1 : 2
0.18 : 2/1×0.18 = 0.36 mol
Mass of HCl:
Mass = number of moles × molar mass
Mass = 0.36 mol ×36.5 g/mol
Mass = 13.14 g
Count the total number of atoms in the chemical formula 5H2O2
Answer:
20 atoms
Explanation:
There are 4 in H2O2 because of 2 hydrogens and 2 oxygens.
Then, multiply by 5 because the coefficient is 5, therefore there are 5 H2O2 molecules.
5 x 4 = 20
The total number of atoms in the chemical formula 5H₂O₂ is 20.
What do you mean by the chemical formula ?The term chemical formula is defined as a way of presenting information about the chemical proportions of atoms that represent a particular chemical compound or molecule, applying chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas.
There are three types of chemical formula that are structural, molecular and empirical chemical formula.
There are four atoms in H₂O₂ because of two atoms of hydrogen and two atoms of oxygen. Then, multiply by five because the coefficient is five, therefore there are 5 H₂O₂ molecules.We get,
= 5 x 4
= 20
Thus, The total number of atoms in the chemical formula 5H₂O₂ is 20.
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Which number is different for isotopes of the same element?
A number of electrons
B number of full shells
C number of nucleons
D number of protons
Answer:
D number of protons or atomic mass
it is option c
no of nucleons
Please help fast, I will give brainliest!
Answer:
4.0 mol
Explanation:
Name:
ELEMENTS COMPOUNDS MIXTURES WORKSHEET
I. Fill in the Blanks:
1. A
can be either an element or compound.
2. A liquid in which the particles settle out is a
mixture called a
3. A substance which contains only one type of atom is an
4. Define matter
mixture also
5. When two or more substances are mixed evenly this is a
called
6. What are two differences between a compound and a mixture?
7. A
mixture is one in which particles or layers can be seen.
8. What are two things that element and compounds have in common?
9. A
separated by physical means, and a
can be separated by chemical means, a
can be
can't be separated by physical or chemical means
10. A
particles do not settle.
is a heterogeneous mixture that has particles farge enough to scatter light, but the
Answer:
Explanation:
coffe
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. C2H6 + O2 --> CO2 + H2O
b. HgO --> Hg + O2
c. CuCl2 + Al --> Cu + AlCl3
d. NO + O2 --> NO2
1. Pentane gas (C5H12) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced chemical equation for this reaction and explain the scientific principle (statement) that requires the balancing of an equation to make it conform to reality.
Answer:
C5H12 + 8O2 → 6H2O + 5CO2
Explanation:
Pentane + Oxygen --> Water + Carbon dioxide
C5H12 + O2 --> H2O + CO2
The balanced equation is given as;
C5H12 + 8O2 → 6H2O + 5CO2
The principle is the law of conservation of matter that states that matter cannot be created nor destroyed. Hence, the reactants pretty much recombine to form the products.
The number of atoms remains conserved.
A certain type of stainless steel cookware has a layer of copper applied to the bottom to help it heat evenly. The copper transfers heat to the pan by
Answer:
Conduction
Explanation:
Conduction seems to be the mechanism whereby heat energy is transferred from adjacent molecules by interactions. In solids and liquids, where even the objects are near to each other, conduction happens more easily than in liquids, where even the molecules are farther separated.
Can someone help please
Answer:
1. 252.535
2. 790.830
3. 8,730,000 atoms
4. 4.0 x 10^-9 mol
5. one mole of mole of water contains 6.02 x 10^23
Explanation:
hope you like it... :)
If you have 25 g of Mg(OH)2, how many moles do you have?
Answer:
0.43mol of Mg(OH)2
Explanation:
the molar mass of Mg(OH)2 is 58.319g/mol so you divide 25 by that and get the amount of moles.
which feature of the ocean floor includes its deeper parts ? A.Trench B.estuary C.mid-ocean D. contnetal slop
Answer:
A
has to 20 characters lol
Which observation would most likely indicate that an endothermic reaction has occurred? O A. a color change O B. the production of gas bubbles O C. an increase in temperature OD. a decrease in temperature
Answer:
The temperature decreases
Explanation:
It decreases because an endothermic reaction absorbs heat so it would make sense if it were lower temperature.
The observation which would most likely indicate an endothermic reaction is
a decrease in temperature.
Endothermic reaction involves the absorption of heat from it surroundings
while exothermic reaction involves the release of heat into the
surroundings(environment).
Endothermic reaction involving absorption of heat from the surroundings will result in a decrease in the temperature which depicts that it has occurred.
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How many stages are in each phase of the cell cycle?
Answer:
The cell cycle is a four-stage process in which the cell increases in size (gap 1, or G1, stage), copies its DNA (synthesis, or S, stage), prepares to divide (gap 2, or G2, stage), and divides (mitosis, or M, stage). The stages G1, S, and G2 make up interphase, which accounts for the span between cell divisions
What is the formula, when rubidium reacts with tellurium?
a. RbTe2
b. RbTe3
c. Rb2Te
d. Rb2Te3
e. none of these
Answer:
Like other alkali metals, rubidium metal reacts violently with water. As with potassium (which is slightly less reactive) and caesium (which is slightly more reactive), this reaction is usually vigorous enough to ignite the hydrogen gas it produces.
Explanation:
hope it helps
e is the right answer. haha
1) if I have a 30 mole sample of gas at a temperature of 120˚C, and a volume of 300 L. What is the pressure of the gas on the container?
Answer:
P = 3.23 atm
Explanation:
Given data:
Number of moles of gas = 30 mol
Temperature = 120°C
Volume of gas = 300 L
Pressure of gas = ?
Solution:
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.
120+273.15 = 393.15 K
P × 300 L = 30 mol × 0.0821 atm.L/mol.K × 393.15 K
P = 968.33 atm. L /300 L
P = 3.23 atm
paulina is heating a test tube in a lab. which tool is she most likely using?
Answer:
what's the options to choose from
pls help will give brainiest
Answer: A
Explanation:
