Answer:
Explanation:
380 x 10³ J
73% of 380 x 10³ = 277.4 x 10³ J
mass of water = m gram
heat used to boil water = m x 4.2 x ( 100 - 16 )
= 352.8 m = 277.4 x 10³
m = 786.3 g
1 gram = .0352 ounce
786.3 gram = 786.3 x .0352 ounce
= 27.68 ounce .
A 1.87 g sample of a hydrocarbon gas occupies a volume of 672.0 mL at 35°C and 741 mmHg. What is the molecular formula of the gas in this sample? MC= 12.01 g/mol, MH = 1.01 g/mol, R = 0.0821 L∙atm/mol∙K
Answer:
C₅H₁₂
Explanation:
Using general law of gases we can determine the moles of the sample and, as we know the mass the molecular formula is the ratio between mass in grams per mole of susbtance. With this, we can find the molecular formula, thus:
Moles:
PV = nRT -General gas law-
Where P is pressure: 741mmHg * (1atm / 760mmHg) = 0.975atm
V is volume in liters: 672.0mL = 0.672L
n are moles -Our incognite-
R is gas constant: 0.0821atmL/molK
And T is absolute temperature: 273.15 + 35°C = 308.15K
Replacing:
n = PV/RT
n = 0.975atm*0.672L / 0.0821atmL/molK*308.15K
n = 0.0259moles
And molar mass is:
1.87g / 0.0259moles =
72.2g/mol.
In 72.2g/mol we can have just 5 moles of C:
5 moles of C will weigh: 12.01g/mol * 5 = 60.05g/mol
And the other mass must come from hydrogen:
72.2g/mol - 60.05g/mol = 12.15g/mol / 1.01g/mol = 12 moles of hydrogen
And molecular formula is:
C₅H₁₂How much heat must be absorbed by 375 grams of water to raise its temperature by 25° C? (specific heat of water = 4.184 J/gC)
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Explanation:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
what type of bond is this combination most likely to form?
Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.
Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.
When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.
One sodium and fluorine each totaling 2 atoms are enough to make the bond.
As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.
The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.
The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.
The name of the compound is sodium fluoride with formula NaF.
brainliest please <3
What is being released into the
atmosphere that is causing
climate change?
Answer:
Greenhouse gases
Explanation:
They are what causes climate change and affects the ozone layer.
Which of the following is not a
compound?
CO2, Chi, nací , ci
If you're talking about organic and inorganic compounds, they are all classified under one.
However, if you're talking about ionic and covalent compounds, they can be classified under them.
Carbon dioxide: Covalent
I believe you're talking about ChL, which could be considered a chemical compound or covalent.
NaCi does not exist. However, if you're talking about NaCl, which DOES exist, it is ionic.
Ci does not exist, but if it's Cl, once again, covalent.
Henceforth, I have no context. ChL OR NaCl could be considered the answer.
Why ChL? Chemical.
Why NaCl? It is the odd one out and ionic bonds are often considered a compound different from others.
When one atom is significantly more electronegative than another one
(difference > 1.7), a covalent bond between them is
If the electronegativity difference is more than 1.7, the bond will have an ionic character. If the electronegativity difference is between 0.4 and 1.7, the bond will have a polar covalent character. Lastly, if the electronegativity difference is less than 0.4, the bond will have a nonpolar covalent character.
if the frisbee represents light, what does the fence represent?
Answer: vacuum
Explanation: light travels as a wave but unlike sound waves or water it doesn’t need any matter to carry it energy along. This means that light can travel through a vacuum which means a completely airless space the wall is vacuum:) hope this helps
Which symbol would you likely see if you were using fragile items in the investigation?
electrical hazard
fire hazard
explosive hazard
glass hazard
Answer:
Glass Hazard
Explanation:
Which of the following best explains why the ripples that are formed when a pebble is dropped into water eventually stop?
A.
A wave will travel only as long as there is energy to be transferred.
B.
A wave will travel only as long as there is a place for it to move.
C.
A wave will travel only as long as there are water particles.
D.
A wave will travel only as long as it takes the pebble to sink in the water.
Answer: the answer is A
Explanation:
well I just know
The swe objects shown are made of the same element. What else is true of
O They have the same shape
B They have the same mass
They are made of only one kind of atom
They have the same number of atoms
Answer:
the answer is D
Explanation:
why can't you see the salt in seawater
The simple awnser is that it dissolved.
How many Oxygen atoms are in two molecules of 2K2CO3 ?
2. The most common type of solution is
solution
a
O liquid-solid
O liquid-gas
Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred. If his conclusion is correct, which substances could he have been observing and why?
Answer:
The production of bubbles indicates that a new substance formed
Explanation:
A chemical change is characterized by the following:
i) A new substance is formed
ii) It is not easily reversible
iii) Heat is evolved
When Vinegar and baking soda are mixed, a gas is evolved. The evolution of a gas indicates that a new substance has been formed, hence a chemical change has taken place.
Answer:
B
Explanation:
edge 2020
William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron? Iron is with one kind of atom that combines with oxygen from the air to form rust (iron oxide). Rust contains two types of atoms, which means it is .
Answer:
IronOxygenExplanation:
Rusting of iron occurs during the reaction of iron and oxygen in the presence of moisture to form hydrous iron (III) oxide, which is a reddish brown substance.
By virtue of this, the atoms which are reactants in the redox reaction would e oxygen and iron.
I hope this was clear and easy to understand.
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an element
a compound
1. What do you call the process in which one tectonic plate move under the
other?
Answer: an earthquake
Explanation:
A calcium atom will react with two atoms of chlorine to form calcium chloride, CaCl 2. What other element will likely react the same way with chlorine?
Neon
Lithium
Rubidium
Strontium
Answer:
Strontium
Explanation:
Elements are classified into groups and periods. Elements that are grouped together in the same group are said to have the same number of valence electrons, hence, they behave the same way chemically. This is the case of Calcium which reacts with Chlorine to form CaCl2. Calcium belongs to Group II in the periodic table, hence, possesses two valence electrons which it transfers to chlorine atoms.
Strontium (Sr) will behave the same way like Calcium because they belong to the same group in the periodic table, meaning that they both have two valence electrons, which they'll transfer. Strontium will form compound SrCl2 with Chlorine.
Which of the following answers can cause food infection?
A. Salmonella in chicken
B. Pesticides on lettuce
C. Mercury in tuna
D. Metal shavings in canned corn
Among all the given options, the correct option is option D that is metal shavings in canned corn. Eating infected food can result in food poisoning.
What is food infection?Eating infected food can result in food poisoning, known colloquially as a foodborne sickness. At every stage of processing or manufacture, harmful organisms including bacteria and viruses may contaminate the food. If food is handled or prepared improperly, poisoning can also happen at home.
Food contamination can occur at any point during the planting, harvesting, or storage of raw materials as well as during cooking or other food preparation processes. Cross-contamination, or the movement of hazardous organisms through one surface to another, is another possibility. Metal shavings in canned corn can cause food infection.
Therefore, the correct option is option D.
To know more about food infection, here:
https://brainly.com/question/20273815
#SPJ2
if an ion has 26 protons and 24 electrons what is the charge on the ion?
Answer:
+2
Explanation:
Protons are positive and electrons are negative, this ion has more positive charges than negative charges therefore the overall charge of the ion is +2.
+26 + -24 = +2
If an ion has 26 protons and 24 electrons, the charge of the ion will be +2.
HOW TO DETERMINE CHARGE OF AN ION:
The charge of an ion can be determined by subtracting the number of electrons from the number of protons in the atom. Charge = no. of protons - no. of electronsAccording to this question, an ion has 26 protons and 24 electrons. This means that the charge of the ion can be calculated as follows:Charge of ion = 26 protons - 24 electrons = +2. Therefore, if an ion has 26 protons and 24 electrons, the charge of the ion will be +2.Learn more about how to calculate charge of an ion at: https://brainly.com/question/14471616?referrer=searchResults
7th GRADE SCIENCE QUESTION FIRST PERSON MARKED BRAINLIIEST
What device converts mechanical energy into electrical energy?
Answer: Electric Generator is a device which converts mechanical energy into electrical energy.
It works by the principle of Electromagnetic induction.
Electromagnetic induction is defined as the production of electric current due to the change in magnetic field. The number or turns or coils present inside the generator is directly proportional to the amount of voltage produced. Electromagnetic induction was first discovered by Micheal Faraday.
Explanation:
A pure silver necklace melts into liquid at 1,763°F. A pure silver
spoon melts at 1,763°F.
Is the melting point of a substance an example of an extensive or
intensive property? Explain how you know.
Answer:
Intensive property
Explanation:
The melting point of a substance is the temperature at which a solid metal changes to liquid.
At this stage, the particles of the solid would have gained sufficient energy to break away from the well ordered lattice configuration and they begin to behave like liquids.
An intensive property of matter is a physical property of matte that does not change as the quantity of matter changes. Melting point is one of such property. In this problem, we know that the mass of a necklace is lesser compared to that of a pure sliver spoon. But the melting point remains the same. This is pure indication of intensive property.An extensive property changes as the mass of the body changes.
Select the correct answer from the drop-down menu.
Read the excerpt. Then complete the sentence about mood.
The mood of this excerpt can best be described as
.
Why’d you put chemistry as the subject for a question about mood? What’s the excerpt? What’s the choices in the drop down list?
Answer:
mysterious
Explanation:
took test
what information do we need to determine the molecular formula of a compound from the empirical formula?
You go out to lunch one day and order a giant steak and a baked potato with sour cream. You ask for the nutritional information, and find out your lunch contains 51 g of carbohydrates (assume no fiber), 29 g of protein, and 40 g of fat. Does this lunch have a balanced energy ratio? If not, what macronutrient should be increased?
Answer:
This lunch does not yet have a balanced energy ratio. Carbohydrate ought to be increased to the stipulated 45 to 65 percent.
Explanation:
Total mass = 51 + 29 + 40 =120g
The percentage of calories from each is;
Carbohydrate - 51/120 * 100 = 42.5 %
Protein - 29/120 * 100 = 24.17 %
Fat - 40/120 * 100 = 33.33 %
According to the National Academy of Sciences, a balanced energy ratio for an adult diet should contain;
10 to 35 percent of calories from protein, 20 to 35 percent from fat, and 45 to 65 percent from carbohydrates.Hence this lunch does not yet have a balanced energy ratio. Carbohydrate ought to be increased to the stipulated 45 to 65 percent.
Submit your Evidence
What are the double and half amounts for each ingredient?
(Will mark brainiest if explained decently)
The double ingredients are the ones that have a whole number in them (for example 2,3,4,5, or even 1)
The half ingredients are the ones that have fractions in them (1/2, 3/4)
The elements least likely to form bonds are found in which group?15
16
83
17
18
Answer:
its actually 18 so you dont have to feel lucky
Explanation:
ywy
3 Polystyrene foam is less dense than water. Molly measured the volume of a
small block of foam by submerging it in water in a measuring cylinder.
The pictures show her results.
Forces in action
cm3
240
-220
cm3
240
220
200
180
160
140
-120
100
cm3
240
-220
-200
-180
160
140
120
100
80
60
200
180
160
140
120
100
80
60
water
80
160
40
20
steel
40
20
40
20
polystyrene
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
What happens to the volume of a gas when the pressure increases and the temperature remains the same?
Answer:
This means that if a gas is heated up and the pressure does not change, the volume will. So for a fixed mass of gas at a constant pressure, volume ÷ temperature remains the same. The volume of a gas rises as its temperature is raised Balloons shrink when placed inside a beaker of cold liquid nitrogen
Explanation:
Answer: Amount, if the number of particles and the temperature are constant, is inversely proportional to strain. As the volume increases, there are two options for the strain to stay the same. ... In other words , the number of particles is equal to the volume if temperature and pressure are constant.
Which statement about the atomic nucleus is correct? a. The nucleus is made of protons and neutrons and has a negative charge. b. The nucleus is made of protons and neutrons and has a positive charge. c. The nucleus is made of electrons and has a positive charge. d. The nucleus is made of electrons and has a negative charge. Please select the best answer from the choices provided A B C D
Answer:
The answer is B
Explanation:
The nucleus of an atom is made up of neutrons and protons since neutrons are neutral and hold no charge while proton hold a positive charge so overall nucleus is positively charged.
The nucleus of the atom has been consisted of neutral neutrons and positive protons. The nucleus has been positively charged. Thus, option B is correct.
The atoms have been the smallest unit of matter. The determination of the structure of atoms has been revealed with several studies.
The atoms have been found to be consist of electrons, protons, and neutrons as subatomic particles. The electrons have been the lightest unit of the atom having negligible mass.
The electrons have been the negatively charged bodies revolving around the nucleus. The central part of the atom has been the nucleus consisting of neutrons and protons.
The neutrons are the neutral atoms, while protons are the positively charged atoms. Thus, the nucleus has been the positively charged entity of the atom. Thus, option B is correct.
For more information about the atomic nucleus, refer to the link:
https://brainly.com/question/10658589
Please Help! Chemistry question
Answer:
i think ur right
Explanation:
