If your lab procedure instructs you to add two parts of acid to each one part of water and you start with 25 ml of water, how much acid will you add, and how will you add it

Answers

Answer 1

When the ratio is given in parts, there is no strict rule on the units of measurement. It is a general term that is applicable to any unit. For example, the unit here is in mL. Since the ratio is 2 parts acid to 1 part water, that is also equivalent to 2 mL acid to 1 mL water. Hence, you have to add 2 mL of acid to water, not vice versa. Other acids are highly reactive to water. So, you have to add the acid slowly to avoid violent reactions.

Related Questions

True or false a homogeneous mixture is a mixture in which it is difficult to distinguish the substances from one another

Answers

A homogeneous Mixture is a mixture in which it is easy to distinguish the substances from one another.

Hope this helps

These substances are made up of two or more elements chemically combined?

Answers

The answer is a compound.

Hope this helps

chemistry
how do you count atoms?
4 HNO3

Answers

Step 1: Write the chemical formula.
Step 2: List all the atoms.
Step 3: Count the number of atoms of each element in 1 molecule.
Step 4: Multiply the number of atoms of each by the coefficient.
Step 5: Make sure your answer makes sense.

To count atoms in 4 HNO3, the coefficient 4 is multiplied with the number of each type of atom. It results in 4 hydrogen atoms, 4 nitrogen atoms, and 12 oxygen atoms.

To count atoms in a chemical formula like 4 HNO3, you look at the coefficients and subscripts. The coefficient (4 in this case) tells us how many molecules of HNO3 there are. We multiply this by the number of each type of atom within one molecule. Nitric acid (HNO3) has one hydrogen (H), one nitrogen (N), and three oxygen (O) atoms. Therefore, to count the atoms in 4 HNO3, we do the following: 4 molecules of HNO3 each contain 1 H atom, giving us a total of 4 H atoms; 4 molecules have 1 N atom each which is a total of 4 N atoms; and 4 molecules each have 3 O atoms, resulting in 12 O atoms in total. So, 4 HNO3 contains 4 hydrogen atoms, 4 nitrogen atoms, and 12 oxygen atoms.

Two or more atoms held together by covalent bonds is called a(n) __________

Answers

Two or more atoms held together by covalent bonds is called a molecule.

how many mg are there in a 5.00 grain aspirin tablet ? 1 grain = 0.00229 oz . there are 454 g/lb

Answers

Final answer:

To convert the mass of a 5.00-grain aspirin tablet to milligrams, convert grains to ounces, ounces to grams, and grams to milligrams. A 5.00-grain aspirin tablet is approximately 324.56 milligrams.

Explanation:

The question is asking to convert the mass of a 5.00-grain aspirin tablet into milligrams. Since 1 grain is equal to 0.00229 ounces, we first need to convert ounces to grams and then to milligrams. We know that there are 28.3495 grams in an ounce, and 1 gram is equal to 1000 milligrams.

First, convert 5.00 grains to ounces:

5.00 grains * 0.00229 oz/grain = 0.01145 oz

Next, convert 0.01145 ounces to grams:

0.01145 oz * 28.3495 g/oz = 0.324555675 grams

Lastly, convert grams to milligrams:

0.324555675 g * 1000 mg/g = 324.555675 mg

Therefore, a 5.00-grain aspirin tablet is approximately 324.56 milligrams.

How many nanoseconds are there in one minute?

Answers

1 minute equals 6e+10 nanoseconds.
I hope this helped! :>

What happens to matter if we add or take away energy

Answers

It we add or take away energy from matter it will change its state. If a solid matter is provided with heat energy it will be converted into liquid and then to gaseous state. Like that if energy in the form of heat is added to gas it will convert in to liquid state or to solid state.

Five strategies needed by learners to acquire knowledge and skills to make informed decisions and take appropriate actions to ensure availability of clean water

Answers

The five strategies could include; 1) research the question of clean water availability on line and in books (2 strategies), 2) interview or ask those affected by lack of availability of clean water and find out how it affects them 3) consult with other groups ie political groups also concerned with this question and find out what they did to ensure availability to clean water and lastly to take actions to fight for the accessibility of clean water for certain groups of people like the First Nations people on reserves in Canada.

Of the molecules sicl4 and sii4, which has bonds that are more polar?

Answers

The bonds in the SiCl₄ molecules will be more polar.

The polarity of bonds within a molecule depends on the difference in electronegativity of the atoms that are involved in the bond. Chlorine is a more electronegative atom than iodine. Therefore, the electrons in the Si-Cl bond will be more concentrated near the Cl, creating polarity in the bond. Iodine is not as electronegative, so it will not result in a very polarized Si-I bond

Answer:

Since the electronegativity difference between the atoms is greater in SiCl4 , it has bonds that are more polar when compound to the other compound.

Explanation:

Energy is expended when a force moves matter across a distance.

True
False

The conservation of mass-energy and the first law of thermodynamics are synonymous.

True
False

Temperature and thermal energy are synonymous terms.

True
False

On the Kelvin scale, temperatures are expressed as positive values only.

True
False

The amount of heat transfer required to change the temperature of one gram of water one degree Celsius is also known as a calorie.

True
False

Answers

1. This is true. Specifically, this energy is in the form of work. This is because we know that the formula of work is force times distance.

2. This is true. Basically, the first law of thermodynamics is the conservation of mass, and consequently, energy. It states that the total energy of an isolated system is constant.

3. This is false. They are not synonymous because temperature is measured in terms of either °C, °F or K. Thermal energy is measured in either joules, calories, or British thermal units. They are related, but not synonymous.

4. This is true. The Kelvin scale is called the absolute temperature scale, because all temperature values are positive. This is don by finding the minimum temperature which is 0 K or equivalent to -273°C. In fact, this temperature is only ideal, and impossible to achieve.

5. This is false. Calorie is a unit of energy. But the transfer of amount of energy to raise the temperature by 1°C of 1 g of water is called the specific heat capacity of water.

Circle the term that does not belong in each of the following groups: KCl NaCl NaHCO3 MgSO4

Answers

The common among the list are: KCl, NaCl, and MgSO₄. All of these compounds are ionic salts since they are formed by the combination of a cation (positively-charged ion) and an anion (negatively-charged ion). Thus, the term that does not belong in here is: NaHCO₃. It is a polyatomic covalent compound.

California’s rice fields are _______.

a.

visited by migrating waterfowl

b.

flooded during the summer

c.

a source of wild bird meat

d.

all of the above

Answers

Answer:

a just took the test on engenuity

Explanation:

hope dis helps : p

California’s rice fields are visited by migrating waterfowl. Hence option a is correct.

What is migration?

Migration is defined as movement from one nation, location, or neighborhood to another in quest of greater chances for settling. The primary beneficial consequences of migration on host countries are the growth of the labor force, the diversification of cultures, the filling of skill gaps in the labor market, and the improvement of local economies. Differences in income and economic opportunities between nations, varied levels of social and human security, and preexisting ethnic and diaspora networks are the main drivers of international migration.

Waterfowl are birds with waterproof feathers and webbed feet that can swim well. They propel themselves through the water by using their webbed feet as flippers. Waterfowl frequently have webbed feet, rounded bodies, long necks, and short wings. Near water bodies, waterfowl typically build their nests on the ground. Some are an exception to this rule, such as the Common Merganser and Wood Duck, which lay their eggs in nest boxes or cavities in trees.

Thus, California’s rice fields are visited by migrating waterfowl. Hence option a is correct.

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Which group contains elements whose atoms have six electrons in their valence shell?

Answers

Group 16 (group 6A) is the answer

When a substance changes its state, all BUT ONE of these statements is true. That is
A) Mass remains constant.
B) Only the form changes.
C) Kinetic energy changes.
D) Something new is formed.

Answers

the answer is D, because a ,b ,and c are all true, and the question is asking for the one that is false

Answer:

D . Something new is formed.

Explanation:

The option A, B and C are true statement while D is false statement.

Mass remains constant.

During a physical change mass remain constant, just state change.

Only the form changes.

During a physical change ,just state change

Kinetic energy changes.

During a physical change ,kinetic energy also change because liquid, solid and gases have different inter molecular forces which relate to K.E.

Something new is formed.

when substance change state, then it remained as such as before, just its state change, not composition.

Is a substance that a filter can seperate into two parts a mixture or a pure substance?

Answers

Mixture. Mixtures can be separated into their component parts, while substances are chemically bonded atoms that can't be separated by physical means.

Which mass measurement contains four significant figures? 1. 0.086 g 2. 0.431 g 3. 1003 g 4. 3870 g

Answers

the answer is # 3

because #1 only has 2 sig figs, #2 has 3 sig figs, and #4 has 3 sig figs

Answer :

(1) The given number in 4 significant figures will be, [tex]8.600\times 10^{-2}g[/tex]

(2) The given number in 4 significant figures will be, [tex]4.310\times 10^{-1}g[/tex]

(3) The given number in 4 significant figures will be, [tex]1.003\times 10^3g[/tex]

(4) The given number in 4 significant figures will be, [tex]3.870\times 10^3g[/tex]

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

(1) The given number 0.086 g converted into 4 significant figures.

In 0.086 g, there are 2 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]8.600\times 10^{-2}g[/tex]

(2) The given number 0.431 g converted into 4 significant figures.

In 0.431 g, there are 3 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]4.310\times 10^{-1}g[/tex]

(3) The given number 1003 g converted into 4 significant figures.

Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]1.003\times 10^3g[/tex]

(4) The given number 3870 g converted into 4 significant figures.

Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]3.870\times 10^3g[/tex]

how many traditional areas of study can chemistry be divided into

Answers

There is five main area of study in Chemistry, these are:

Analytical, this focusses on experimental equipment and methods used in chemistry (e.g., NMR, Spectroscopic methods, etc.)

Biochemistry - focuses on the chemistry of compounds and processes in living things (e.g., amino acids, proteins, DNA, cellular respiration, Krebs cycle, etc.)

Organic - focuses on the chemistry on most carbon-based molecules found in living things (e.g., hydrocarbons, alcohols, carbolic acids. Amines, ester, etc.)

Inorganic - (focuses on all elements other than carbon (e.g., fluorine, silicon, xenon, etc.)

Physical - focuses on the basic structure and energetic son atoms and molecules (e.g., subatomic structure, is nice and covalent bonding, thermodynamics, reactions, etc.)

Need help for the last questions!

Answers

Potassium ion (K+) ; 18 e- = [Ar]
Highest noble Gas is [Ar] at 18 e-
Neutral K is 19 e- with shorthand: [Ar] 4s1
eliminating an electron, eliminates 4s1 and makes it same configuration as Argon.

In each vertical column, or group, of the periodic table, the elements have ____.
a. similar chemical and physical properties
b. different chemical and physical properties
c. similar physical but different chemical properties
d. different physical but similar chemical properties

Answers

Similar chemical and physical properties

In each vertical column or group of the periodic table, elements have similar physical and chemical properties.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Does the density of ice affect the melting rate of ice, or does adding objects affect melting rates? I'm going to need evidence of some kind. If not, that's okay.

Answers

The density of ice does not affect the melting rate. But, adding an object does affect the melt rate. The reason this is is because when there is an object, there is less to melt. Hence, affecting the melting rate.

Adding objects affect the melting rate and hasten the process because each object possess an energy in the form of heat soo.

What is the concentration of nitrate ions in a 0.225 msr(no3)2 solution?

Answers

We are given that there are 2 moles of NO3 from the 0.225 M Sr(NO3)2 solution. Therefore we simply use stoichiometry to solve this problem.

Concentration NO3 = 0.225 M Sr(NO3)2 * (2 moles NO3 / 1 mole Sr(NO3)2)

Concentration NO3 = 0.45 M

Answer : The concentration of nitrate ions is 0.450 m.

Solution : Given,

Molarity of [tex]Sr(NO_3)_2[/tex] = 0.225 m

The balanced ionic equation is,

[tex]Sr(NO_3)_2\rightarrow Sr^{+2}+2NO^-_3[/tex]

From the reaction, we conclude that the 1 mole of [tex]Sr(NO_3)_2[/tex] produces 2 moles of [tex]NO^-_3[/tex] ions. That means the concentration of nitrate ions is twice the value of [tex]Sr(NO_3)_2[/tex].

then, 0.225 m of [tex]Sr(NO_3)_2[/tex] gives 2 × 0.225 of [tex]NO^-_3[/tex] ions

Now the concentration of [tex]NO^-_3[/tex] ions is equal to 0.450 m.

Lavoisier's discovery that air was not a substance but rather a mixture of nitrogen and oxygen is described as history-making. why do you think this description is accurate?

Answers

Antoine Lavoisier was part of a wealthy family in Paris. He pursued to study science upon realizing that chemistry or the study of the elements was not a well-studied field. His discovery of that air was a mixture of nitrogen and oxygen gave rise to the concept of COMBUSTION after repeating the experiments made by Priestly using mercury and other metal oxides.

The event was such a history-making because it disproved that concept that air was a pure substance along with 3 others: earth, fire, and water.

2. You have 2 m3 of a mineral ore sample. It has a mass of 1 × 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.

Answers

2 because you add then subtract

How many moles of sodium iodide are needed to remove 5.95×10−6 mol of o3?

Answers

You have to find the reaction involving sodium iodide and ozone or O₃. If you search in the internet, the reaction would be

O₃(g) + 2 NaI(aq) + H₂O(l) → O₂(g) + I₂(g) + 2 NaOH(aq)

Using the stoichiometric coefficients in the reaction, the solution would be

5.95×10⁻⁶ mol O₃ * (2 mol NaI/1 mol O₃) = 1.19×10⁻⁵ mol NaI

Final answer:

Assuming a 1:1 molar ratio, the number of moles of sodium iodide needed to remove [tex]5.95\times10^-^6[/tex] mol of ozone is also [tex]5.95\times10^-^6 mol[/tex].

Explanation:

To calculate the number of moles of sodium iodide (NaI) required to remove a certain number of moles of ozone [tex](O_3)[/tex], we need to know the stoichiometry of the reaction between NaI and [tex]O_3[/tex]. This information is not provided, so we'll have to assume it is a 1:1 molar ratio, which is typical for direct redox reactions where one molecule reacts with another one-on-one.

Under the assumption of a 1:1 molar ratio, to remove [tex]5.95\times10^-^6 mol[/tex] of [tex]O_3[/tex], you would need an equal amount of NaI, which would also be [tex]5.95\times10^-^6 mol[/tex] of NaI. We are assuming a straightforward reaction where one mole of [tex]O_3[/tex] reacts with one mole of NaI to form products.

If an isotope has an atomic number of 8 and a mass number of 18 how many neutrons

Answers

It will be Oxygen . And total 8 protons, 8 electrons and 9 neutrons are present in it.

Write the formula for barium nitrite. write the formula for barium nitrite. bn ba(no2)2 ba3n2 b(no2)3 bano3

Answers

Ba(NO2)2 Since we're dealing with a nitrite, you know the formula will have NO2 in it. Also, since Barium is in the 2nd column of the periodic table, that means that Barium has 2 valance electrons. And you can kind of think of the nitrite ion as a really odd looking atom that really wants to bind with an electron. And since Barium has 2 electrons available for binding, you'll have 2 nitrite ions bind to it. So you get Ba(NO2)2

The formula for Barium nitrite is Ba(NO₂)₂. This is because barium has a +2 charge and nitrite has a -1 charge, so two nitrite ions are needed to balance the charge of the barium ion. So correct option is a.

a) Ba(NO₂)₂.

Barium nitrite is a chemical compound formed by the combination of the elements barium (Ba) and nitrite (NO₂). To understand the formula of barium nitrite, let's break down the composition of the compound:

1. Barium (Ba):

Barium is a metallic element with the chemical symbol "Ba." It belongs to the alkaline earth metal group, which is located in group 2 of the periodic table. Barium is a highly reactive metal that readily forms compounds with other elements.

2. Nitrite (NO₂):

Nitrite is a polyatomic ion composed of one nitrogen atom (N) and two oxygen atoms (O). Its chemical formula is NO₂. Nitrite is negatively charged due to the presence of two extra electrons, which gives it a -1 charge.

The chemical formula of barium nitrite is Ba(NO₂)₂.

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One liter of a solution ph 9 has how many more hydroxide ions (oh-) than 1 l of a solution of ph 4?

Answers

100,000 times more. The rule is that the product of the concentration of (H+) and (OH-) in molars is always 10^-14 (if it is more, they combine and produce simple water which brings the product back down to this number again. If it is less, water molecules will split to bring the product back up to equilibrium).
pH 9 means (H+) is 10^-9 molar. But that means (OH-) is 10^-5 at the same time.
pH 4 means (H+) is 10^-4 molar. But that means (OH-) is 10^-10 at the same time.
10^-5 / 10^-10 = 10^5 or 100,000 times more.

Final answer:

A solution with a pH of 9 has 100,000 times more hydroxide ions than a solution with a pH of 4 due to the corresponding pOH values and hydroxide ion concentrations based on the relationship between pH and pOH.

Explanation:

The student has asked about the difference in the number of hydroxide ions between a solution with a pH of 9 and another with a pH of 4. Using the relationship PH + pOH = 14, we can find the pOH.

For the pH 9 solution, the pOH would be 5 (14 - 9), which corresponds to a [OH-] of 1.0 × 10-5 M. For the pH 4 solution, the pOH would be 10 (14 - 4), corresponding to a [OH-] of 1.0 × 10-10 M. Hence, the pH 9 solution has 1.0 × 10-5 M of OH-, which is 100,000 times greater than the 1.0 × 10-10 M OH- in the pH 4 solution.

Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as...

Answers

It's called a compound because different elements are held together by a chemical bond.

How many protons and neutrons does a silicon si atom have and hwere are each of there subatomic particles located how many electrons does a silicon atom have?

Answers

Silicon
Protons = 14
Neutrons =mass number-protons
28-14=14
Neutrons = 14
Electrons =14

Repulsion between closely packed protons in the nucleus is overcome by

Answers

The strong nuclear force overcomes the electromagnetic repulsive force.
(the strong nuclear force is about 137 times stronger than the electomagnetic force at subatomic distances!)

Answer:

Strong nuclear force

Explanation:

As we know that positive charges repel each other so protons do repel each other although atoms are stable because of strong nuclear force acting between nucleons (protons and neutrons in nucleus are called nucleons) which overcome the repulsive force between the proton. Strong nuclear force is very short-range force and acts only in distance of angstrom or picometre.

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