a. consistency because she's making notes about how well each sample sticks together.
Answer:
A. consistency
Explanation:
I took the test
When New York receives the most direct rays of the sun
Answer:
At noon
Explanation:
The sun at solar noon reaches its highest point when it is due South.
write the empirical formula for C2H4O8
Answer:
CH2O4
Explanation:
empirical formula for C2H4O8 is CH2O4
which of the following is the poorest conductor electricity
Calcium
silicon
cobalt
sodium
fluorine
Answer:
Fluorine
Explanation:
It is a non-metal does not conduct electricity
The poorest conductor of electricity is fluorine.
Why fluorine is the poorest conductor of electricity?
All of these are metals and metalloids so they are the good conductor.
Calcium
silicon
cobalt
sodium
Fluorine is a nonmetal so it is not a good conductor.
What is an electrical conductor?A conductor is a material that allows the flow of charge (current electricity).In a conductor, there is a free electron in a valance cell.the energy gap between the valance shell and conduction is small.In general, all metals and a few metalloids are good conductors.Nonmetals do conduct electricity because the energy gap between the valance band and conduction is very high.so there is n flow of charge.Learn more about conductor here:- https://brainly.com/question/24154868
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Two changes are described below.
A green banana turns yellow and ripens.
A layer of rust forms on an iron nail.
Which statement is true about the two changes? (5 points)
Group of answer choices
Both are chemical changes because new substances are formed.
Both are physical changes because only the physical state of the substances change.
A is a physical change due to a change of state, but B is a chemical change because new molecules are formed.
A is a chemical change due to a change of state, but B is a physical change because new molecules are formed.
Answer:
Both are chemical changes because new substances are formed.
Explanation:
in both examples new substances are formed, meaning it is a chemical chang. It cannot be a physical change since it doesn’t involve a chnage in its shape, volume, length, or mass
To solve this, we must know each and every concept behind chemical change and physical change. Therefore, thee correct option is option A that is both are chemical changes because new substances are formed.
What is chemical change?
Chemical change is a reaction in which forming and breaking of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same.
A physical change is characterized by a differences in physical attributes. Melting, transformation to a gas, changes in strength, change in durability, changes in crystal structure, texturing change, shape, color, volume, and density are all examples of physical qualities. Tempering steel to make a knife blade is an instance of a physical change.
One famous example of chemical change is iron rusting. The arrangements , odor and colour of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature. Ripening of banana is also a chemical change.
Therefore, thee correct option is option A that is both are chemical changes because new substances are formed.
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Single and double replacement reactions practice WS CuCl2 +
F2 »
CuF2
+
Cl2
They all have the same choices but one of them its not gonna be used.
Answer:
limiting reactant
Explanation:
it is consumed totally
Why is it important for lab safety to know the proper names of equipment in a lab
Answer:
Knowing your lab equipment and their names will aid in having a successful experiment and may help in correcting errors.
If you do not know your lab equipment, that will only result in having a lack of knowledge of the equipment or not knowing how to correct a mistake in an experiment.
Explanation:
Hope I helped.
2. If 5.4 g Al are reacted with excess HCI, how many moles of H2 will be produced?
2 Al + HCI → 2 AICI, + 3 H, (unbalanced]
Answer:
0.3 moles of H2 will be produced.
Explanation:
Balanced reaction: 2 Al + 6 HCl → 2 AlCl3 + 3 H2
Given Al mass = 5.4 g, we know Mr of Al is 27
Using the formula:
moles = mass / Mr
moles of Al = 5.4 / 27
moles of Al = 0.2 moles
Here we see that "2" molar mass before Al; so in this reaction, "1" molar mass will have [(0.2)/2] = 0.1 moles. He see "3" molar mass before H2, therefore moles of H2 is (3 * 0.1) = 0.3 moles.
Balanced chemical equation is given by
[tex]\\ \tt\hookrightarrow 2Al+HCl\longrightarrow 2AlCl_3+3H_2[/tex]
Moles of Al:-
[tex]\\ \tt\hookrightarrow 5.4/27=0.2mol[/tex]
Now
2mol of Al produces 3moles H_2. 1mol of Al produces 1.5mol H_20.2mol Al produces 0.3 mol H_2What are comets made of?
A. Dust, sand, and hydrogen
B. Rock, metal, and liquid water
C. Dust, metal, and helium
D. Rock, dust, and ice
SUBMIT
Answer:
C. Rock, dust, and ice.
Explanation:
Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices.
How many grams of NO can be produced from 12 g of NH3 and 12 g of O2?
please help me plsssssssss!!!!!!!!!!!!!!!!!!!
Taking into account the reaction stoichiometry and limiting reagent, 9 grams of NO can be produced from 12 g of NH₃ and 12 g of O₂.
Reaction stoichiometryIn first place, the balanced reaction is:
4 NH₃ + 5 O₂ → 4 NO + 6 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:
NH₃: 4 moles O₂: 5 moles NO: 4 moles H₂O: 6 molesThe molar mass of the compounds is:
NH₃: 17 g/mole O₂: 32 g/moleNO: 30 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
NH₃: 4 moles ×17 g/mole= 68 grams O₂: 5 moles ×32 g/mole= 160 gramsNO: 4 moles ×30 g/mole= 120 gramsH₂O: 6 moles ×18 g/mole= 108 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 68 grams of NH₃ reacts with 160 grams of O₂, 12 grams of NH₃ reacts with how much mass of O₂?
[tex]mass of O_{2} =\frac{12 grams of NH_{3}X160 grams of O_{2} }{68 grams of NH_{3}}[/tex]
mass of O₂= 28.23 grams
But 28.23 grams of O₂ are not available, 12 grams are available. Since you have less mass than you need to react with 12 grams of NH₃, O₂ will be the limiting reagent.
Mass of NO formedConsidering the limiting reagent, he following rule of three can be applied: if by reaction stoichiometry 160 grams of O₂ form 120 grams of NO, 12 of O₂ form how much mass of NO?
[tex]mass of NO=\frac{12 grams of O_{2} x120 grams of NO}{160 grams of O_{2}}[/tex]
mass of NO= 9 grams
Then, 9 grams of NO can be produced from 12 g of NH₃ and 12 g of O₂.
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If you have 60 moles of HCl, what should the volume of solution be to make a 10 M solution?
Answer:10
Explanation:
Multiply the volume by the density to get the mass.
Divide the mass by the molar mass to get the number of moles.
What property is being measured in the image??
A. mass
B. Density
C.Volume
D.Height
Answer:
I'm pretty sure that the answer is c
What is the molar mass of a gas if 0. 473 g of the gas occupies a volume of 376 ml at 23. 0°c and 1. 90 atm?.
Answer:
The molecular weight of the unknown gas is 16.1 g/mol.
Which of the following is made of an element?
Rust
A rose
diamond
Blue paint
O None of these
The half-life of the radioactive isotope silver-104 is 30 minutes. After how many minutes will about 20 grams of a 40-gram sample of the silver-104 isotope remain?
Select one:
a. 0
b. 60
c. 90
d. 30
Answer:
d
Explanation:
The amount of time it will take for the 40g sample to get cut in half is 30 minutes
If 4.00 moles of fluorine are reacted with excess HBr, how many grams of bromine will be formed
The mass of bromine that would be formed is 639 g
StoichiometryFrom the question,
We are to determine how many grams of bromine would be formed
First, we will write the balanced chemical equation for the reaction,
The balanced chemical equation for the reaction is
F₂ + 2HBr → 2HF + Br₂
This means, 1 mole of fluorine reacts with 2 moles of HBr to produce 1 mole of bromine.
Then,
4.00 moles of fluorine will react with excess HBr to produce 4.00 moles of bromine.
Therefore,
The number of moles of bromine produced is 4.00 moles
Now, for the mass of bromine formed,
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of bromine = 159.808 g/mol
Then,
Mass of bromine formed = 4.00 × 159.808
Mass of bromine formed = 639.232 g
Mass of bromine formed ≅ 639 g
Hence, the mass of bromine that would be formed is 639 g.
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please help asap! i need it fast
Answer:
*
Explanation:
- The geocentric model was unable to properly explain these changes in the inferior planets' appearance.
- All objects, including the moon, sun, and stars, have been shown to orbit around the Earth in the geocentric theory, whereas all other objects, including the Earth, moon, and stars, are said to circle around the Sun in the heliocentric theory.
1. What is a gene?(1 point)
A. a structure that contains many chromosomes
B. a section of DNA that encodes a specific protein
C. a large molecule that performs a specific function
D. a point that joins two halves of a chromosome
A gene is the basic unit of an organism. Gene is encompassed inside the nucleus of a cell where all the chromosomes and DNAs are located. Thus option A is correct.
What is chromosome?Chromosomes are genetic materials contained in a gene inside the nucleus of a cell. There are different number of chromosomes in each level of organisms.
Chromosomes are made of proteins and DNA (deoxyribonucleic acid). it is a thread like structure having a knot in the center. In human beings there are 23 pairs of chromosomes in each cell.
Chromosomes are transferred to the offspring from the parents and thus they are the genetic material inherited from the parents. Thus gene is the functional unit of heredity. Genes codes each proteins and are responsible for the characteristics of each organism.
Therefore, gene is a structure that contains many chromosomes. Hence, option A is correct.
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26) aashish has the power of 100 watt What does it means?
Answer:
It means he could do 100 joule of work in 1 second.
Explanation:
It means he could do 100 joule of work in 1 second.
Please help me to do the warm up
Valeric acid is an organic acid composed of carbon, hydrogen, and oxygen. Valeric acid has a molar mass of 102.13 g/mol and is 58.80% C, 9.87% H, and the remainder is oxygen. What are the empirical and molecular formulas of valeric acid?
i have finish with your assignment.
How can you convert diamond into graphite ?
Answer:
➢There are different ways to trigger the conversion of diamond to graphite, for instance by simply heating the diamond under exclusion of oxygen or even with an aimed mechanical stroke.
Explanation:
hope it will help you have a great day bye and Mark brainlist if the answer is correct
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Can anybody help with these questions?
What is the % Mg in MgO?
What is the % H in Ca(C2H3O2)2?
What is the % Ba in Ba(NO3)2?
What is the % of each element in Ni3(PO4)2?
What is the % of each element in Al2(CrO4)3?
What is the % of each element in (NH4)2(SO4)?
Answer:
i do not know
Explanation:
PLZZZZZ HELPP How do you predict the bond length and energy would change if hydrogen formed a bond with Astatine (At)?
The bond length and energy of the bond formed between hydrogen (H) and astatine (At) would change if the bond order increases or decreases or when its potential energy is at the lowest.
What is bond length?Bond length is also referred to as bond distance and it can be defined as an equilibrium distance between the nuclei of two (2) covalently bonded atoms in a molecule.
What is bond energy?Bond energy can be defined as the amount of chemical energy that is required to break one mole of a given chemical bond.
In Chemistry, the bond length and energy of a molecule is typically determined by the following:
The bond order or number of bonded electrons.The potential energy possessed by the molecule.In conclusion, you can predict that the bond length and energy of the bond formed between hydrogen (H) and astatine (At) would change if the bond order increases or decreases or when its potential energy is at the lowest.
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What happens when a neutral object is brought near a positive object?
Answer:
stick together like magnets
Explanation:
Answer:
If a positively charged body is brought near to a neutral or uncharged body, it induces a negative charge on the near side and a positive charge on the far side of the neutral object. This creates a force of attraction between the two bodies.
Pls help one chemistry question :/
In the following reaction, the energy of the reactants is 860 kJ/mol and the bond energy of the products is 680 kJ/mol. What is the total energy of the reaction? Is the reaction endothermic or exothermic?
Answer:
the anserw should be 665KJ
Cola contains phosphoric acid and carbonic acid. Which is the most likely reason that cola also contains a large amount of sugar or other sweetener? to improve the fizziness to counteract the sourness of the acids to provide color to the drink.
Answer:
B. to counteract the sourness of the acids
Explanation:
Edge:) Good luck!
Answer:
B. to counteract the sourness of the acids
Explanation:
B. to counteract the sourness of the acids
Can someone please help me omg
I think option b is the answer
The mass of an object is 220g with a density of 55g/ml . Find the volume
Explanation:
from definition of density we have
density=mass/volume
and density=55 mass=220g
volume=220/55
volume=4ml
or 4×10^-3l
Answer:
4cm³
Explanation:
220.0g is our mass
55.0g/cm³ is our density
220g/55g/cm³
= 4cm³
Under what conditions does the Ideal Gas Law not apply and gases are considered real? Check all that apply.
high pressure
low pressure
high temperature
low temperature
From what we know, we can confirm that the ideal Gas Law does not apply and gases are considered real under conditions of low temperature and high pressure.
What is the ideal gas law?This law is used to describe how gasses will behave under normal conditions. However, it is not always accurate in certain conditions, the requirement for conditions to be ideal resulted in the name of the ideal gas law. This law fails at low temperatures and high pressure due to the low volume occupied by the gas under these conditions.
Therefore we can confirm that the ideal Gas Law does not apply and gases are considered real under conditions of low temperature and high pressure.
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Answer:
A and D
Explanation: