Answer:
Element: Pure substance consisting of one type of atom. Compound: Pure substance consisting of two or more different atoms. Mixture: Two or more different substances not chemically combined.
Explanation:
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A sample of ethanol (C2H6O) has a mass of 0. 2301 g. Complete combustion of this sample causes the temperature of a bomb calorimeter to increase by 1. 33°C. The calorimeter has a mass of 2. 000 kg and a specific heat of 2. 45 J/g•°C. What is the heat of combustion for this sample? kJ.
The heat of combustion of the sample is calculated to be -1300 kJmol-1.
We know that energy is neither created nor destroyed but is converted from one form to another. The heat lost by the ethanol when it is burnt is equal to the heat gained by the calorimeter.
Heat gained by calorimeter = 2.×10^3 g × 2. 45 Jg-1°C-1 × 1. 33°C
= 6.5 kJ
Number of moles of ethanol = 0. 2301 g/46 g/mol = 0.005 moles
Heat of combustion of the sample = -( 6.5/0.005 moles) = -1300 kJmol-1
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Did the flower used in this investigation come from a plant that reproduces sexually or asexually? Explain your answer. (If u don’t know the answer don’t answer.) (No picture) (I didn’t know what category)
Answer:
Asexually
Explanation:
Plant's cannot reproduce sexually
The material used as a biological sensor is one dimension of 20 mm, the other Are in nanometers
Answer: 20 , 40
I want know the answer now !
Jacinta wrote the following passage about chemical changes.
A chemical change is a change that results in one or more new substances with different properties. When a chemical change occurs, the new substance can give off an odor, such as rotting fruit or cookies baking in the oven. Chemical changes can cause color changes, such as iron rusting and turning a reddish-brown color. When wood is burned or ingredients are mixed for baking a cake, a new substance is made.
Choose the best statement that Jacinta can add to her passage.
Chemical changes, such as rotting fruit and burning wood, are affected by temperature. More heat and energy causes a faster chemical change.
Wood burning and fruit rotting creates new substances through a chemical change that is affected by sound energy.
Rotting fruit and burning wood is a chemical change that occurs because there is a decrease in temperature. Less heat causes a faster chemical change.
When a chemical change occurs, the new substance that is created has properties similar to the original substance.
1. If the surface area of liquid is large then evaporation will be
A. small
B. large
C. moderate
D. slow
1. If the surface area of liquid is large then evaporation will be
A. small
B. large
C. moderate
D. slow
Answer:-B. Large
Explanation:-Evaporation increases with increasing surface area. This is because the greater the surface area (exposed to the air), the more molecules escape into the air.
More surface area = Higher rate of evaporation.
In Natural selection, who/what makes the decision about which traits are desirable and get passed to future generations?
In Artificial selection, who/what makes the decision about which traits are desirable and get passed to future generations?
please help me with these two questions complete sentences please thank you! This is for 50 points and BRAINLIEST.
Answer:
Artificial selection, also called "selective breeding” is where humans select for desirable traits in agricultural products or animals, rather than leaving the species.
now imagine that you have analyzed an additional vntr. from the blot below, what is the expected frequency of occurrence?
The pH scale is used to tell if a substance
is an acid or base. Substances with a pH
of 7 are neutral. An acid is anything
below 7 and a base is anything above
7.What would a household cleaner with a
pH of 10 be considered on the pH scale?
Answer:
Explanation:
pH > 7 as 10 is more than 7
The cleaner is very corrosive.
It is a moderately basic. If it was 12 that would make it much more basic (100 times more basic).
A student creates a hypothesis about their upcoming experiment. What must the
student do in their experiment with relationship to their hypothesis?
create a law based on the hypothesis
change the experiment to make the hypothesis correct
ignore the hypothesis
make observations to prove or disprove the hypothesis
Answer:
D. make observations to prove or disprove the hypothesis
Explanation:
How many moles of nitrogen dioxide, NO2, are present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L
There are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.
IDEAL GAS LAW:The number of moles of nitrogen dioxide (NO2) in this question can be calculated by using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)V = volume (L)T = temperature (K)R = gas law constant (0.0821 Latm/molK)n = number of molesAccording to the reaction conditions given in this question;
P = 2.46 atmV = 4.8Ln = ?T = 330K2.46 × 4.8 = n × 0.0821 × 330
11.81 = 27.093n
n = 11.81 ÷ 27.093
n = 0.436mol
Therefore, there are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.
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do Plants and animals create energy the same way?
Answer:
Yes
Step By Step Explanation:
Plants extract energy from food molecules the same way animals do — by cellular respiration.
Most, if not all plants are producers, and they make their own food using sunlight and raw materials, through a process called "photosynthesis". ... Plants get their energy in form of starch whereas animals get it in form of glycogen. Animals get their energy from the food they eat. Animals depend on other living things for food. Some animals eat plants while others eat other animals. This passing of energy from the sun to plants to animals to other animals is called a food chain.
Animals obtain energy from the food they consume, using that energy to maintain body temperature and perform other metabolic functions. Glucose, found in the food animals eat, is broken down during the process of cellular respiration into an energy source called ATP.
Hopes This Helps
the empirical formula for trichloroisocyanuric acid
Answer:
OCNCl
Explanation:
The empirical formula for trichloroisocyanuric acid, the active ingredient in many household bleaches, is OCNCl. The molar mass of this compound is 232.41g/mol.
Select the correct answer.
Tropical forests contain dense trees, which allow less sunlight to penetrate. Emergent trees are trees that grow to a height of more than 45 to 55 meters, above the usual height of trees in tropical forests. Which system provides the best possible explanation for why these trees grow to those heights?
A.
shunted growth pattern
B.
homeostasis
C.
due to less exposure to sunlight
D.
phototropism
1. Why do you think the map is labeled "Three Sisters”?
also, i know this isn’t chemistry but i couldn’t find Earth Science so don’t come for me . i would appreciate it if y’all could help me the best you can!
Answer:
It's called the “The Three Sisters” because it comes from an Iroquois legend. The Legend says corn, beans and squash are inseparable sisters that were given to the people by the “Great Spirit.” It is important to note, however, that the “Three sisters” are also found in many other areas and tribes around North America.
What does an atom's period tell us?
Select one:
a. Number of protons
b. Number of shells
c. Number of valence
electrons
d. Number of electron
When you take a hot shower, the
a
shower curtain sometimes moves
into the shower towards you. Why
does this happen?
With hot water comes hot steam, it fills the shower area with steam which raises the air temperature and the air then rises out of the shower
Which of the following is the strongest covalent bond?
Single bond
Double bond
Triple bond
Hydrogen bond
Answer:
Triple bond is the strongest bond
Triple bonds are stronger than the equivalent single bonds or double bonds, with a bond order of three.
Answer:
single bond.In a single covalent bond, when the electrons are shared between two s orbitals, the resulting bond is a sigma (σ) bond . Sigma bonds are the strongest covalent chemical bonds....!!
What is leukemia?
A. Cancer that affects the blood
B. Prostate cancer
C. Breast cancer
D. Lung cancer
Answer:
A: Cancer that affects the blood
information: Leukemia is a cancer of the early blood-forming cells. Most often, leukemia is a cancer of the white blood cells, but some leukemias start in other blood cell types.
In the following experiment, a coffee-cup calorimeter containing 100mL OF H2O is used.
Please provide more of the question so I am able to answer, but I do know that H20 has 0 calories.
PC13 ionic or covalent
Answer:
The bond between Phosphorus and Chlorine in PCl3 is covalent as chlorine needs one electron and phosphorus has metallic character and easily donate electron
1. How many covalent bonds can nitrogen form?
2. Which of the following represents a covalent compound?
A. O2
B. CO2
C. Cl2
D. NaCl
3. 2. Nitrogen is a diatomic element with five valence electrons. Create a model of a molecule of nitrogen.
Answer:
1. 3 covalent bonds
2. CO2
Nitrogen can form three covalent bonds and carbon dioxide represents a covalent compound.Molecule of nitrogen is attached in image below.
What is a covalent bond?Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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carbon-14 has a half-life of 5,730 years. how long will it take for 112.5 g of a 120.0-g sample to decay radioactively?
Answer:
It will take 22920 years to decay 112.5 g of 120 grams.
Explanation:
The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. NaCl AgNO3 Right arrow. NaNO3 AgCl If 4. 00 g of NaCl react with 10. 00 g of AgNO3, what is the excess reactant? AgCl NaCl AgNO3 NaNO3.
The reactant that has been present in excess in the reaction has been NaCl. Thus, option B is correct.
The balanced chemical equation has been:
[tex]\rm NaCl\;+\;AgNO_3\;\rightarrow\;NaNO_3\;+\;3\;AgCl[/tex]
From the balanced equation, for complete utilization of 1 mole of sodium chloride, 1 mole of silver nitrate has been used.
The moles of can be given as:
[tex]\text Moles\;=\;\dfrac{m}{mwt}[/tex]
Where, mass of Silver nitrate, [tex]m=10\;\text g[/tex]
Molecular mass of silver nitrate, [tex]mwt=168\9.87\;\text {g/mol}[/tex]
Substituting the values, moles of silver nitrate has been:
[tex]\rm Moles \;AgNO_3=\dfrac{10}{169.87} \\Moles \;AgNO_3=0.058\;mol[/tex]
Mass of sodium chloride, [tex]m=4\;\text g[/tex]
Molecular mass of sodium chloride, [tex]mwt=58.44\;\text {g/mol}[/tex]
Substituting the values, moles of sodium chloride has been:
[tex]\rm Moles\;NaCl=\dfrac{4}{58.44}\\Moles\;NaCl=0.068\;mol[/tex]
From the balanced chemical equation,
[tex]\rm 1\;moles\;AgNO_3=1\;moles\;NaCl\\0.058\;mol\;AgNO_3=0.058\;mol\;NaCl[/tex]
Since, the available moles of NaCl has been 0.06 mol, and used NaCl has been 0.05 mol. Thus, NaCl has been the excess reactant. Hence, option B is correct.
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Answer:
B- NaCl
Explanation:
if this helped could you put this as the brainiest
balanced chemical equations a) Sodium + Oxygen
b) Potassium + Chlorine
c) Hydrogen + Chlorine
d) Nitrogen + Hydrogen
e) Calcium + Nitrogen
f) Calcium carbonate
8) Zinc + Hydrochloric acid Zinc chloride + Hydrogen h) Ammonia + Nitrogen - Calcium nitride Carbon dioxide + Calcium oxide Ammonium nitride
Answer:
a) sodium oxide
b) potassium peroxide
c) Hydrogen chloride
d) form ammonia
e) Calcium nitride
In a covalent bond between identical atoms, the electrons are shared between the atoms. If the atoms are not identical, the electron distribution is so that the electrons are closer to one atom than the other. This type of bond is called a(n) covalent bond.
Answer:
If the atoms are not identical, the electron distribution is electrons are closer to one atom than the other. This type of bond is called a(n) covalent bond.
Explanation:
7) Element Families on the Periodic Table have similar _____________________. There are ________ Families.
8) Alkali Metals are good conductors of _____________________________ and ________________________________.
9) There are a total of _________ elements that are grouped as Transition Metals.
10) As opposed to metals, non-metals can be very __________________________. They have no metallic ____________
and do not reflect ______________________.
11) All Lanthanide Series elements occur naturally except for ___________________________________.
12) All Actinide Series elements are ___________________________ and most are _____________________
The periodic table is composed of metals and nonmetals arranged in groups and periods.
The periodic table is an arrangement of elements in groups and periods based on their properties. The properties of elements repeat at regular intervals hence the term, "periodic".
The answers to the questions are;
7) Element Families on the Periodic Table have similar properties. There are 18 families.
8) Alkali Metals are good conductors of heat and electricity.
9) There are a total of 38 elements that are grouped as Transition Metals.
10) As opposed to metals, non-metals can be very opaque. They have no metallic luster and do not reflect light.
11) All Lanthanide Series elements occur naturally except for promethium.
12) All Actinide Series elements are radioactive and most are synthetic.
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The MSDS for propane gives it a health rating of 1, a flammability rating of 4, and a reactivity rating of 0. According to the MSDS, which best describes propane? highly corrosive highly toxic highly flammable highly reactive.
Propane has MSDS rating for flammability 4, thus the compound has been highly flammable. Thus, option C is correct.
The MSDS has been the Material Safety Data Sheet . It has been given for the compounds hazardous levels. The compounds have been checked on various parameters and ranked on the scale of 0 to 4.
The compounds being less value in the parameter has 0 value, while 4 has been the maximum value.
The MSDS rating for propane has been able to deliver the compound to be:
Health rating: 1The compound has been less positive towards the health.
Flammability: 4The compound has been highly flammable.
Reactivity: 0The compound has been least reactive.
Since, propane has MSDS rating 4 for flammability, the compound has been highly flammable. Thus, option C is correct.
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Answer:A) Highly corrosive but not highly flammable
Explanation:
right on edge :)
I am having the worst day ever, Someone please cheer me up. :( I'll mark you as brainiest. :(
Once I told a chemistry joke
I got no reaction.
What do you do with a sick chemistry teacher?
If you can't helium, and can't curium, you might as well barium.
I don't trust atoms,
I heard they make up everything
Hope I helped make ur day. :)
which colour would you expect ekasilicon to be
Answer:
it would ether be gray to black or silver to gray and black
Explanation:
because of my calculation ekasillicon would be that color because of the eyes and because of your color seeing .
Hey can anyone pls answer dis in ur own wordssss
Answer: sorry
Explanation:
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