Answer:
The ancient Greeks believed that fire was one the four basic elements that composed all things in the universe. In the mythology of virtually every culture, fire is a sacred substance that gives life or power. Fire is not, in fact, a substance. When you gaze at the leaping flames of a campfire, you’re observing not an object, but a process – a chemical reaction. It’s the same chemical reaction that occurs when a cut apple left on the counter turns brown, when silver tarnishes or when an iron nail rusts.
That process is oxidation: combining oxygen with another substance. The defining difference between a fire and your half-eaten apple is speed: fire is an oxidation process that happens very fast, so that light, heat and sound are released — often with enough force and majesty to justify the ancients’ reverence.The sudden release of energy causes temperatures to rise, sometimes by thousands of degrees. And it also results in smoke, the toxic waste of fire’s leftovers.
The fire triangle and the fire tetrahedron
Fire TetrahedronThe fire triangle identifies the three needed components of fire:
fuel (something that will burn)
heat (enough to make the fuel burn)
and air (oxygen)
Explanation: i hope this helps sry its long
What is a better conductor of electricity? Copper Iron Nickel Aluminum
Why did the Boeing 767 crew need to do a density calculation? What was wrong
with theircalculation?
Answer:
Their calculation was way too off to the actual one.
Explanation:
Answer:
They need a density calculation so they can get the right vaule. Their calculation was way off compare to the acutal vuale.
Explanation:
A atom has 20 electrons, 21 neutrons, and 20 protons. What is the atomic mass of the atom?
name= calcium
atomic mass= 40.078 atomic mass unit
no of protons= 20
no of electrons=20
Name a plant in which leaf is modified into tendril
Answer:
yellow vetch
Explanation:
how were you able to identify the periods?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, the period of the periodic table are the horizontal (left to right) rows in the periodic table. Elements in the same period have the same number of electron shells. There are seven periods in the periodic table.
The periodic table of elements is the table that contains all chemical elements arranged according to there atomic number. Atomic number is the number of protons present in the nucleus of an atom.
significant figure of 87 000 ms
Answer:
2 significant figures.
Explanation:
Significant Figures Rules:
1. Anything that isn't a zero is a sig fig
2. If a decimal point comes after the ones digit, everything before the decimal is counted as sig fig (i.e 2000. would be 4 sig figs).
3. If we are dealing with small decimals, the zero before and after the decimal (i.e 0.002) is a placeholder and is not counted as sig figs.
4. Any zeros between 2 significant digits is considered in sig figs (i.e 2002 would be 4 sig figs)
Since we are dealing with 87000, we see that we have no decimal point. That means our only sig figs are 8 and 7, which equals 2 sig figs.
Jennifer is making pies to serve at the family picnic. If each pie serves 6 people, how many pies will be needed to serve 60 people at the picnic?
Answer:
10
Explanation:
10 pies because 60 divided by 6 is 10.
what is the molar mass (g/mol) of cyclohexanol
Explanation:
Molar mass of cyclohexanol : 100.158 g/mol
what organisms have no seeds and no specialized tissues?
PLZ HELPP Cynthia sees that most of the ice in her iced tea has melted. Assuming the water and the ice are at the same temperature, what happened to the particles in her ice? A.The particles have a much greater amount of kinetic energy than before. B.The particles have the same amount of kinetic energy but no longer vibrate in place. C.The particles have had their kinetic energy converted into thermal energy. D.The particles have a higher temperature than before and are moving more freely.
Answer:
The most correct option here is D
Explanation:
The difference between a solid (ice) and a liquid (water)/gas (steam) is that the particles in a solid is tightly packed (and do not move) as against the particles in liquid which moves quite freely or those in gases that move very freely.
When a solid (for example ice) is subjected to heat, it's particles receives the heat energy, hence have a higher temperature, and starts moving from its compact position which turns the solid into liquid. This was what happened to the ice in Cynthia's iced tea. The ice got/absorbed an increased temperature from the surrounding tea and it's particles began to move (more freely) thereby causing the ice to melt.
Answer:
D
Explanation:
when calcium carbonate is heated two new substances calcium oxide and carbon dioxide are formed................write a word equation for the above chemical reaction
Answer:
CaCO3------->CaO + CO2
Heat
1)Describe pure sand and pure salt. Use a hand lens if available to get more detail. Type a description. a)sand b)salt 2)Investigate the dissolving properties of pure sand and pure salt. Which one will be caught in the filter paper if each substance was mixed with water and then filtered? Filter both separately if you are not sure. Devise a plan to get pure sand and pure salt in different piles from a 1 gram sample of the mixture. Include in your plan:
Answer:
See explanation
Explanation:
A salt is made up of homogeneous particles while sand is made up of heterogeneous particles. Salt is a crystalline substance while sand is a coarse substance.
If salt and sand are mixed with water, salt forms a solution with water, hence, salt cannot be caught on filter paper. However, sand does not form any chemical specie with water hence it is caught on the filter paper as a solid.
Н - О - Н
I have to find the Molecular formula
Air is a mixture because it is colorless when unpolluted. Why is this statement
wrong?
Explanation:
Air is indeed a mixture but the reason is wrong. It is because there can be different concentrations of gases in the air to give the mixture of air, such as nitrogen, oxygen and carbon dioxide.
Answer:
The statement is wrong because air is already colorless when unlimited because when it is polluted.it is not air but it is carbon and methane with oxygen so we cannot say it air.
Put 5.1 x 10^-7 into standard notation.
Answer:
My answer to the question is 0.00000051
Answer:
0.00000051
Explanation:
When dealing with hazardous materials generated in the lab, the two most important guidelines are: (Choose two.)
Answer and Explanation:
All generated hazardous waste must be collected and disposed of properly (according to regulations)Experimental procedures to be used should be determined by the one which generates the least amount of hazardous wasteI hope this answer and explanation is easy to follow. Let me know if I can be of further assistance.
Convert 48.66 L to daL
A solution containing a mixture of lactic acid and lactate was found to have a pH of 4.26. Calculate the ratio of the lactate concentration to the lac
Given :
pH of solution of mixture of lactic acid and lactate is 4.26 .
To Find : [tex]log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4[/tex]
The ratio of the lactate concentration to the lactate .
Solution :
We know , pKa of lactic acid is :
pKa = 3.86 .
Now , the solution of lactic acid and lactate is a buffer solution .
So , pHof buffer acid is given by :
[tex]pH=pKa+log(\dfrac{[Salt]}{[Acid]})[/tex]
Putting all given values :
[tex]log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4[/tex]
Taking anti log both the sides , we get :
[tex]\dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]} = 2.51[/tex]
Therefore , the ratio of the lactate concentration to the lactate is 2.51 .
Hence , this is the required solution .
How much energy your body used, in joules if your health device indicates 982 Calories were burned during your workout? How many Calories in a meal containing 4.2 x 10 4 joules?
Answer:
4.11x10⁶Joules
10.04Cal
Explanation:
Calories and joules are units of energy used in several fields of science.
4184Joules are equal to 1 Cal.
In joules, 982 calories are:
982 Calories * (4184 J / 1 Cal) =
4.11x10⁶JoulesIn the same way, 4.2x10⁴ Joules are:
4.2x10⁴J * ( 1Cal / 4184J) =
10.04CalThe branch of science concerning heat flow and energy conversions is called _____. a) chemistry b) thermodynamics c) conversion science d) atomic studies
Answer:
Explanation:
The answer isssssssss ddddddd
Answer:
b thermodynamics
Explanation:
Read the passage "Ants" in the box below.
ANTS
Carla and Maurice are observing ants in their backyard. Carla is drawing
pictures of the ants around the anthill and the objects they carry. The pictures will
decorate her bedroom wall. Maurice is recording the number of ants that enter the
anthill and what types of things they bring with them, so he can figure out what ants
eat
Which type of activity did the two perform?
O Both participated in scientific activities in which they objectively observed and recorded
information about ants to answer a question about nature.
Carla participated in a scientific activity, while Maurice participated in an artistic activity.
Carla participated in an artistic activity, while Maurice participated in a scientific activity.
O Both participated in artistic activities in which they subjectively observed and recorded
information about ants to illustrate a part of nature.
Answer:
C) Carla participated in an artistic activity, while Maurice participated in a scientific activity.
Explanation:
Scientific activities involve making observations, which ultimately leads to the series of steps that aims at solving the observed problem or answering a question that arises from the problem. This is the case of Maurice who is observing and recording information about ants in order to solve a curiosity (about what they feed on).
However, on the other hand, Carla is given a pictorial representation of the ants and what they carry. It is not based on curiosity or to answer a question about the ants but rather for decoration or aesthetic purposes, which is what makes her activity artistic.
A florist prepares a solution of nitrogen-phosphorus fertilizer by dissolving 5.66 g of NH4NO3 and 4.42 g of (NH4)3PO4 in enough water to make 17.0 L solution. What is the molarity of NH4+ in the solution?
Answer:
9.39x10⁻³M NH₄⁺
Explanation:
To find molarity of NH₄⁺ we need to calculate moles of NH₄⁺ that comes from NH₄NO₃ and (NH₄)₃PO₄
Moles from NH₄NO₃ (Molar mass: 80.043g/mol):
5.66g * (1mol / 80.043g) = 0.0707 moles NH₄NO₃ = Moles NH₄⁺
Moles from (NH₄)₃PO₄ (Molar mass: 149.09g/mol):
4.42g * (1mol / 149.09g) = 0.0296 moles (NH₄)₃PO₄ * 3 = 0.0889 moles NH₄⁺
Total moles NH₄⁺:
0.0707 moles + 0.0889 moles = 0.1596 moles NH₄⁺ in 17.0L
Molarity: 0.1596 moles / 17.0L =
9.39x10⁻³M NH₄⁺Which of these is a property of acids? Question 1 options: They taste sour. They turn litmus paper blue. They feel slippery. They typically contain an -OH group.
Answer:
C , They taste sour
Answer:
They taste sour
Explanation:
I know it's late but i couldnt help it i just took the test
describe any two methods of preparation of alcohol chemistry
Answer:
Reduction of carbonyl compounds.
Hydrolysis of Alkyl Halides.
When a glass or a watermelon is moved, the volume stays the same. When a liquid is poured into a glass, the volume and the shape change. When gas is used to fill a balloon and the balloon is popped, the volume stays the same. Help pls
Answer:
ITS A. (Give me brainliest!!)
When a glass or a watermelon is moved, the volume stays the same as they are in a fixed shape and the volume of a solid state. Option A correct.
What is the solid-state?A solid-state is a state of matter in which the molecules of matter are closely packed with each other with the maximum molecular force of attraction for a fixed shape.
Glass and watermelon are fixed in shape as they are made before and volume is also fixed and the molecules are fixed in definite shape and the volume cannot be changed.
Therefore, Option A correct. When a glass or a watermelon is moved, the volume stays the same as they are in a fixed shape and the volume of a solid state.
Learn more about the solid state, here:
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How do the test variables (independent variables) and outcome variables (dependent variables) in an experiment compare? A. The outcome variable (dependent variable) controls the test variable (independent variable). B. The test variable (independent variable) controls the outcome variable (dependent variable). C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other. D. The test variables (independent variables) and outcome variables (dependent variables) are the same things.
Answer:
Study Island:
The answer is...
C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other.
Explanation:
The test variable (independent variable) and the outcome variable (dependent variable) have no effect on each other. Hence, option C is correct.
What is an independent variable?The independent variable can be altered, manipulated and changed in an experimental study.
Researchers often measure independent and dependent variables in studies to test cause-and-effect relationships.
The independent variable is the reason or cause. Its value is independent of other variables.
The dependent variable is the outcome whose values depend on changes in the independent variable.
Hence, option C is correct.
Learn more about the independent variable here:
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important of thermometer
Answer:
to see if something or someone has either a low or high temperature
Explanation:
because you wanna know if some has a fever so you dont get the coronna virus
Why is the following molecule nonpolar and hydrophobic?
Answer: the answer is not the glycerol molecule in fats contains a carboxyl group
The given molecule is nonpolar and hydrophobic because there is an unequal distribution of hydrogen and oxygen atoms. Thus, the correct option for this question is D.
What is a Hydrophobic molecule?A Hydrophobic molecule may be defined as a type of molecule that is interestingly repelled from a mass of water. It is typically not soluble in water. These molecules are always repelled away from water contact.
When there is an equal distribution of hydrogen and oxygen atoms delivered, the constructed molecule is polar and hydrophilic in nature. This is because the partial positive charge on the hydrogen atom attracts the partial negative charge of oxygen and makes the molecule attracted to the water.
Therefore, there is an unequal distribution of hydrogen and oxygen atoms is a statement that is responsible for a molecule to be nonpolar and hydrophobic. Thus, the correct option for this question is D.
To learn more about Hydrophobic molecules, refer to the link:
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You travel by express Greyhound bus from Indianapolis, IN to Tampa, FL; this is a distance of 1,070 miles. With no stops, the trip takes 16 hours. What is the average speed (nearest whole number)? a) 45 mi/h b) 55 mi/h c) 90 mi/h d) 67 mi/h
PLEASE HELP <3.
D, 67
Explanation:
1070 miles/16 hours = 66.875 miles per hour average traveling speed, which rounds up to 67.
How many nanograms are in 34g?
Chemistry Question
Answer:
There's 34,000,000,000 nanograms in 34g.
Explanation:
U can write it like 3.4e+10.
Hope I helped ya.
< Sarah >