Explanation:
pure substances are those substances which are made up of one elements
mixture that those substances which are made by more than two or three elements
Answer:
Brainliest is appreciated
Explanation:
Substances which have a specific composition and cannot be separated into any constituents are called pure substances. Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures.
EXAMPLES
pure substance
gold, pure water, hydrogen gas
mixture substance
oil and water, sand and sugar
Why enthalpy of combustion is always negative ?
Answer:
reason is Heat is involved, the reaction is exothermic and therefore heat is lost to the surrounding
please help me:) i need to show work too..
Answer:
1 0.005Km
2 3000mg
3 700 cm
5. 2500mm
6 0.0045
Explanation:
What phase(s) of matter are the elements in Main Group 8?
Answer:
Solids.
Explanation:
Group 8 on the Periodic Table consists of transition metals:
- Fe (Iron)
- Ru (Ruthenium)
- Os (Osmium)
- Hs (Hassium)
Usually, transition metals are solids.
Which of the following is an example of element? A.Water B.Chlorine C.Carbon Dioxide D.Sugar
Which of the following elements is a metalloid? A. vanadium (V) B. radon (Rn) C. silicon (Si) D. rubidium (Rb)
Answer:
silicon
Explanation:
What are formed when particles in solar wind travel along lines of Earth's magnetic field and collide with gas atoms?
Answer: Auroras
Explanation:
Hope this helps
Answer:
Option Auroras is correct
Explanation:
I got it right.
What am I calculating for when solving for 17.0 mL of ethanol, density of ethanol= 0.94 g/mL
Answer:
you are caculating for the mass/wight of ethanol
Explanation:
DxV=M
hroughout the reflection, make sure you have a copy of the Student Guide and your data table. Choose the terms that complete the statements. In this lab, you determined the combination of humidity, air temperature, and air pressure that create weather patterns. is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. is a measure of how hot or cold the air is, and is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.
Answer:
A. relative humidity B. air temperature C. air pressure D. atmospheric
Explanation:
just completed the assignment
Answer:
Basically reconfirming what the other guy said
Explanation:
Relative humidity
Air temperature
Air pressure
Atmostpheric
Yall have a nice day.
The number 325.608 rounded to 3 significant figures is A) - 326 B) - 325.6 C) - 325.61 D) - 325 BRAINLIEST!!
Answer:
A.326
Explanation:
B is incorrect because that would be 4 significant figures.
C is incorrect because that would be 5 significant figures.
D is incorrect because, while it is 3 significant figures, it is rounding the .6 down which doesn't make sense. since it's .6 you should be rounding up not down.
which can be found on the periodic table: elements, compoumds or mixtures? pleaae help!!!!!!!!
Answer:
Elements
Explanation:
A compound: contains atoms of different elements chemically combined together in a fixed ratio.
A mixture: contain different elements and compounds but the ratio is not fixed nor are they combined via chemical bonds.
Answer:
elements can be found on a periodic table
When two or more substances blend but do not chemically combine it is a _____________.
Answer:
Mixture.
Explanation:
Hello,
In this case, when blending we are continuously sliding the substances until we obtain small particles that when do not chemically but physically combine we say they are forming a mixture. Nevertheless, when they chemically combine they form a chemical compound due to the formation of bonds between them.
Regards.
What volume of acetic acid of density 1.10g/cm3 is needed to react with 250 mL of 0.50M Stronuim hydroxide?
Answer:
[tex]V=13.6cm^3[/tex]
Explanation:
Hello,
In this case, given the reaction in which the acetic acid reacts with strontium hydroxide to yield water and strontium acetate:
[tex]2CH_3COOH+Sr(OH)_2\rightarrow Sr(CH_3COO)_2+2H_2O[/tex]
The first step here is to compute the moles of strontium hydroxide that are reacting given its volume in liters (0.250 L) and concentration:
[tex]n_{Sr(OH)_2}=0.50mol/L*0.250L=0.125molSr(OH)_2[/tex]
Next, considering the 1:2 mole ratio between the strontium hydroxide and the acetic acid (molar mass = 60 g/mol) we compute the grams of acid that are consumed:
[tex]m_{CH_3COOH}=0.125molSr(OH)_2*\frac{2molCH_3COOH}{1molSr(OH)_2} *\frac{60gCH_3COOH}{1molCH_3COOH}\\ \\m_{CH_3COOH}=15gCH_3COOH[/tex]
Then, by using the density of the acetic acid, we compute the volume:
[tex]V=\frac{m}{\rho}=\frac{15g}{1.10g/cm^3} \\ \\V=13.6cm^3[/tex]
Best regards.
A biochemical reaction will proceed in the direction as written if:_______a. ΔG > 0.b. ΔH > 0.c. ΔG = zero.d. ΔG < 0.e. ΔH < 0.
Answer:
ΔG < 0
Explanation:
The condition for spontaneity of a chemical reaction is that ∆G<0. Hence for any biochemical reaction to proceed as written, ∆G must have a negative value.
If ∆G >0, the reaction is not spontaneous and will not proceed as written. ∆G=0 means that the reaction has attained equilibrium.
Psychoanalysis (Freud) is concerned with Question 1 options: chemical balances in the brain someone's measurable actions childhood trauma Self-actualization
Answer:
childhood trauma.
Explanation:
I took the test and the answer i got correct was Childhood trauma.
name one benifit and one limitation of comparative investigations
Answer:
Limitation of comparative investigation is that when it is done on a huge population, huge amount cost is required. Explanation: Benefit of comparative investigation is that we can get descrete information about specific breed or species. It is important for the study of behaviour of many organisms.
Explanation:
lab report for physical and chemical changes??!
Answer:
[See Below]
Explanation:
✦ Physical Changes:
✧ Is when the form changes, but not the chemicals in that form.
✧ An example of this would be chopping wood. It's still wood but it's a different size now. It's easier to burn it since it's smaller.
✦ Chemical Changes:
✧ Is when the chemicals inside that form change to something else entirely
✧ An example would be an egg, when you cook the egg it can turn into being scrambled or fried. But you can't eat the raw egg until the chemicals change.
~Hope this helps Mate. If you need anything feel free to message me.
Answer:
Here is an example of the full report for this type of lab. Includes data table etc. I would suggest making some changes on wording prior to submission
Explanation:
Reactants undergo chemical reaction to form products.this chemical equation represents one such reaction.the coefficient for one of the reactants or products is incorrect .which part of the chemical equation is incorrect
Answer:
Explanation:
The part of 10 O2 is wrong.
Explanation:
The correct equation can be written as follows:
2 C 4 H 10 + 13 O 2 → 8 C O 2 + 10 H 2 O
The equation was not balanced before.
For a balanced chemical reaction, the number of atoms before and after the reaction should be the same. This is because matter is neither created not destroyed in a reaction, It changes from one form to another through chemical reactions.
A recipe for spaghetti sauce requires 2.5 cups of tomato sauce. If only metric measures are available, how many milliliters of tomato sauce are needed? (1qt = 4 cups, 1q = 946 mL)
Answer:
6.0 × 10² mL
Explanation:
Step 1: Given data
A recipe for spaghetti sauce requires 2.5 cups of tomato sauce.
Step 2: Calculate the US Quarts (qt) corresponding to 2.5 cups of tomato sauce
We will use the relationship 1 qt = 4 cups.
2.5 cups × (1 qt/4 cups) = 0.63 qt
Step 3: Calculate the milliliters (mL) corresponding to 0.63 qt of tomato sauce
We will use the relationship 1 qt = 946 mL.
0.63 qt × (946 mL / 1 qt) = 6.0 × 10² mL
When sand is coated with a layer of trimethylhydroxysilane, (CH3)3SiOH, it repels water and can no longer get wet. Hydrophobic sand (aka, magic sand) is fun to play with, but it can also have useful applications in agriculture to reduce water consumption (Water Resour. Manag. 2010, 24, 2237–2246). Predict the geometry for the silicon atom in trimethylhydroxysilane.
The geometry of the silicon atom in trimethylhydroxysilane is:__________
Arrange the compounds by boiling point. a. A pentane molecule with the condensed structure CH3CH2CH2CH2CH3. b. A neopentane molecule with the condensed structure C(CH3)4. c. A hexane molecule with the condensed structure CH3CH2CH2CH2CH2CH3.
Answer:
Hexane > pentane > neopentane
Explanation:
The boiling point of alkanes varies with chain length. The greater the length of the chain, the greater its boiling point.
Since hexane consists of a longer chain than pentene, its boiling point is definitely higher than that of pentane.
Similarly, neopentane is a branched alkane, the boiling point of a branched alkane is always lower than that of its straight chain counterparts.
Hexane has the highest boiling point due to its higher molecular weight, followed by pentane, and neopentane has the lowest boiling point due to its highly branched structure.
The boiling point is primarily influenced by two factors: molecular weight and branching. The higher the molecular weight, the stronger the van der Waals forces and, therefore, the higher the boiling point. Branching in a molecule tends to disrupt the intermolecular forces, reducing the boiling point.
Hexane has a higher molecular weight than pentane, so it would generally have a higher boiling point than pentane.
Neopentane is highly branched, with four methyl (CH3) groups attached to the central carbon. This branching significantly disrupts the intermolecular forces, reducing the boiling point compared to straight-chain molecules like pentane and hexane.
To learn more about the boiling point, follow the link:
https://brainly.com/question/2153588
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How many constitutionally isomeric monochlorination products are possible from the following?a. 2-Methylpentane b. 3-Methylpentane c. 2,2-Dimethylbutane d. 2,3-Dimethylbutane
Answer:
a. 5
b. 4
c. 3
d. 2
Explanation:
How many constitutionally isomeric monochlorination products are possible from the following?
a. 2-Methylpentane
In 2-methylpentane, there are five possible monochlorinated substitutional products in the reaction of chlorination of 2-methylpentane in the presence of sunlight.
b. In 3-methylpentane there are four possible monochlorinated substitutional products in the reaction of chlorination of 3-methylpentane in the presence of sunlight.
c. In 2,2-Dimethylbutane there are three possible monochlorinated substitutional products in the reaction of chlorination of 2,2-Dimethylbutane in the presence of sunlight.
d. In 2,3-Dimethylbutane there are two possible monochlorinated substitutional products in the reaction of chlorination of 2,3-Dimethylbutane in the presence of sunlight.
test results indicated a chemical change has taken place
Causes warm air to rise in the atmosphere. is what type of heat transfer?
Answer: Convection
Explanation: Convection is the transfer of heat energy in a fluid. This type of heating is most commonly seen in the kitchen with a boiling liquid. Air in the atmosphere acts as a fluid.
You have developed a promising anti-cancer agent, but it has poor solubility in water. Which of the following changes should improve water solubility? ( there is two possible answers)a) adding a methyl groupb) adding a hydroxyl groupc) adding a carboxyl groupd) increasing the size of the druge) adding a benzene ring
Answer:
adding a hydroxyl group
adding a carboxyl group
Explanation:
The addition of a hydroxyl or a carboxyl group to the molecule will increase its solubility. This is because, the -OH group will form hydrogen bonds with the water molecules. The formation of such hydrogen bonds will lead to improvement in the solubility of the anti cancer agent and solve the problem of poor solubility of the anticancer agent in water.
can someone please help me
It is possible to make a buffer that functions well near pH 7 using citric acid, which contains only carboxylate groups. Explain. Drag the terms on the left to the appropriate blanks on the right to complete the sentences.a. decreaseb. increasec. repulsionsd. associatese. attractionsf. dissociate1. Successive deprotonations______the (−) charge density on the resulting anion.2.This results in unfavorable electrostatic_____between the carboxylate anions, which reduces the likelihood that a proton would_____.3. It is more favorable for the proton to remain bound to reduce unfavorable charge_______.
Complete Question
it is possible to make a buffer that functions well near pH 7 using citric acid, which contains only carboxylate groups. Explain. Drag the terms on the left to the appropriate blanks on the right to complete the sentences.
Words : decrease, increase, repulsion, associates, attractions, dissociate
1. Successive deprotonations -------------- the (−) charge density on the resulting anion.
2.This results in unfavorable electrostatic --------- between the carboxylate anions, which reduces the likelihood that a proton would ----------
3.it is more favorable for the proton to remain bound to reduce unfavorable charge----------- . .
Answer:
1
Successive deprotonations increase the (−) charge density on the resulting anion.
2
This results in unfavorable electrostatic repulsion between the carboxylate anions, which reduces the likelihood that a proton would dissociate
3
It is more favorable for the proton to remain bound to reduce unfavorable charge repulsion
Explanation:
Generally
Successive deprotonations decrease the (−) charge density on the resulting anion.
This because deprotonations means removal of positive charge
This results in unfavorable electrostatic repulsion between the carboxylate anions, which reduces the likelihood that a proton would dissociate
It is more favorable for the proton to remain bound to reduce unfavorable charge repulsion
A 18.00 g g milk chocolate bar is found to contain 11.00 g g of sugar.1. How many milligrams of sugar does the milk chocolate bar contain?2. What will be the amount of sugar in milligrams if the size of the milk chocolate bar is reduced from 18.00 g to 4.000 g ? Express your answer in milligrams to four significant figures.
Answer:
1. 1.100x10⁴mg
2. 2444mg
Explanation:
1. The 18.00g milk chocolate bar contain 11.00g of sugar. In miligrams:
11.00g * (1000mg / 1g) = 1.100x10⁴mg
2. If a bar of 18.00g contain 11.00g of sugar, a bar of 4.000g will contain:}
4.000g bar * (11.00g / 18.00g) = 2.444g of sugar.
In miligrams:
2.444g * (1000mg / 1g) = 2444mg
A gas in a 6.2 mL cylinder has a pressure of 1.4 atmospheres. A piston is pushed in
until the gas volume is 3.1 mL, while the temperature remains constant. What's the
final pressure of the gas in the cylinder?
A) 2.8 atm
B) 4.8 atm
C) 3.2 atm
OD) 5.6 atm
Answer:
A) 2.8 atm
Explanation:
Why do minerals with metallic bonds conduct electricity so well?
Answer and Explanation:
Because metallic bonding involves delocalized electrons. It is described as a "sea of electrons", because the electrons are not confined around the nucleus of metal atoms, but they are delocalized: thay can be located in one nucleus and then in another neighbor atom. Thus, the electrons have more freedom to move from one part of the metal to another and electricity is well conducted.
Which would be an adaptation for living in the tundra?
I Need Help Asap
Answer:
Long fur
Explanation:
Long fur is an adaption for the tundra because it is cold and snowy in the tundra, so therefore long fur is an adaption
Answer:
thic long fur that overs you
Explanation: