COPY out the following sentences and fill in the gaps.

1. Sulfuric acid releases _____________ ions in solution. This makes the solution _______________________.

2. Sodium hydroxide is an ___________________. It releases ____________________ ions in solution. This makes the solution __________________________.

3. Write word and symbol equations for both of the above situations, a template is given below.

Sulfuric acid --> _____________ + ___________________

________ --> ___________ + ______________

Sodium hydroxide --> _____________________ + ___________________

______________ --> ______________ + __________________

The amount of matter contained within an object is commonly referred to as mass. The most typical way to measure it is as inertial mass, which refers to an object's resistance to acceleration under the influence of a net force. 

Although the size of an object and its mass are frequently associated, larger objects do not always have more mass. For instance, an inflated balloon would have substantially less mass than a silver golf ball. Although there are numerous alternative units used to describe mass around the world, the kilogram is the accepted unit of mass according to the International System of Units (SI) (kg).

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Answer

a. Single displacement

b. Decomposition

When classifying chemical reactions, consider how reactants change to form the products.

An equation for a chemical reaction has a left side and a right side. The arrow separates the left and right sides.

Each product or reactant can be one or more elements.

We can use letters* to represent products and reactants in a reaction.

Two reactants become one product.

One reactant becomes two products.

Start with two reactants, a compound and an element. To form the products, the element replaces one of the elements that was in the compound.

Start with two reactants that are compounds. To form the products, an element from each compound replaces each other.

Therefore, equation (a) is a single displacement reaction and equation (b) is a decomposition reaction.

*Each letter represents an element. Two elements make a compound. A letter can also represent a compound if compound stays together during the reaction.

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PBr₃ and Carbon Tetraiodide is a covalent compound. Whereas, KBr and Iron (III) Oxide is an ionic compound.  

Covalent compounds and molecular compounds are those compound where two non-metals, or a non-metal are bonded to each other through the sharing pair of electrons.

PBr₃ are covalent because phosphorous is in the column 3 in periodic system and it has three valence electrons in its outer shell. Therefore, in case of Carbon Tetraiodide carbon and iodide both are non-metals that why they are covalent compounds.

KBr and Iron (III) Oxide both are Iron (III) Oxide because they are formed by the interaction between a metal and non-metal. They will transfer the electrons from positively to negatively charged atoms.

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Sodium does not form a stable ion with the same electronic configuration as neon.

Electronic configuration of an element describes that how the electrons are distributed in its atomic orbitals. Electronic configuration of an atoms follows a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Sodium (Na) ion has the same electronic configuration as that of neon. Both are the isoelectronic species with 10 electrons and the electronic configuration is 1s22s22p6.

Sodium has electronic configuration is 1s22s22p63s1. It loses one electron  to give Na+ ion with the electronic configuration of neon (Ne).

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The gas will have a volume of 25.0 mL at a pressures of 60 kPa or a temperature of 200 K.

The average kinetic potential of the particle in a system is measured by temperature. Temperature is measured using thermometers, which measure the temperature of a system by taking a reading of the system's average kinetic energy. Temperature is measured in degrees, with higher temperatures indicating a higher average kinetic energy. Temperature can be affected by a variety of factors, including the amount of energy added to or removed from a system, the number of particles present in the system, and the type of particles present in the system.

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Answer:

It is a sour candy. And when you put it in water it will dissolves.  

Explanation:

Answer:

Plants are called autotrophs because they can use energy from light to synthesize, or make, their own food source. Many people believe they are “feeding” a plant when they put it in soil, water it, or place it outside in the Sun, but none of these things are considered food. Rather, plants use sunlight, water, and the gases in the air to make glucose, which is a form of sugar that plants need to survive. This process is called photosynthesis and is performed by all plants, algae, and even some microorganisms. To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight.

Answer:

energy is of course required for photosynthesis to occur as photosynthesis is self is the process of plants of green plants to make food or to provide food for themselves in the presence of sunlight carbon dioxide and using water from the soil in the definition you can also say that sunlight is needed for photosynthesis to take place and some light is a form of energy which is solar energy so energy is required for photosynthesis to occur

corkscrew-shaped ridge

The screw’s applied force (output force) is always larger than the screw’s applied force (input force). As a result, a screw’s mechanical advantage is always larger than one.Screws are a type of basic machine. They have a thread, which is a corkscrew-shaped ridge wrapped around a cylinder. When driving in a screw, the head is particularly designed to allow a screwdriver or wrench to hold the screw.

Another sort of inclined plane is the screw. When an inclined plane wraps around a straight rod-like structure, a spirally grooved surface with a pointed end is generated. It serves to keep things together.

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Answer:

Earnings based on how much they sell

Explanation:

A sales presentation can be defined as series of talk given by a salesperson with the attempt to persuade someone or a potential customer to buy a particular product, by giving information it. Some salespersons resort to the use of dramatics so as to initiate and close the sale of a particular product by engaging in series of theatrical actions.

In sales and marketing, the term closing with respect to a sales can be defined as the process of making a business sale successful such as through the exchange of money for a particular product or goods.

For a salesperson to be able to close a sales, he or she require abilities such as courage, negotiation skills, listening ears and interpersonal skills to do so or achieve a successful sales. After a successful sales, they're entitled to a percentage of the amount made from selling a particular product or closing a deal based on what is stated in the contract. These amount of money earned with respect to each sales is generally referred to as commissions.

Commission can be defined as an amount of money earned based on how much a salesperson sell.

The Ideal Gas Law states that the volume of a gas is proportional to its temperature at constant pressure.

Pressure is a force that is applied to an object over an area. It is measured in units of force per unit area, such as Pascals (Pa). Pressure can be applied in a number of ways, such as by squeezing, pushing, or compressing. It can also be caused by the weight of an object, or the force of gravity. Pressure can be used to do work, such as moving an object or creating heat.

This means that if we double the temperature, we will double the volume. Therefore, if the temperature of the gas sample is raised from 200 K to 600 K, the volume of the gas sample will increase from 6.00 L to 12.00 L.

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To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

The statement "atoms have a small, dense nucleus" is true.  A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.

Therefore, the correct option is option C.

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Answer:

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Answer: C

Explanation:

Answer:

1) 0.98 atm

2) 74.58 cmHg

3) 14.47 lbs./in²

4) 745.8 torrs

Explanation:

We are given the atmospheric pressure as 745.8 mmHg

1) Converting mmHg to atmospheres(atm), we divide the pressure by 760.

P = 745.8/760

P = 0.98 atm

2) Converting mmHg to cmHg, we multiply the pressure by 0.1;

P = 745.8 × 0.1

P = 74.58 cmHg

3) Converting mmHg to lbs./in², we divide the pressure by 51.75;

P = 748.5/51.715

P = 14.47 lbs./in²

4) Converting mmHg to torrs, we multiply the pressure by 1;

P = 745.8 × 1

P = 745.8 torrs

I'm pretty sure it's B :)

Answer:

solid

Explanation:

lithium is a solid so it would still be solid since it is at 100 degrees and has not yet gotten to 180 degrees which is when it melts

Answer:

the last one

explanation is the white colour

Looking at the images that we have, we can see that there is a reaction in the images A and C.

We would need to settle in our minds what is implied when we talk about a chemical reaction. You have to know that if we are talking about a chemical reaction then we are talking about the kiondfs of reaction that would lead to the following observations;

1) There is a change in the temperature of the system

2) There is an effervescence of gas in the system

3) There is a change in color

4) There is the appearance of a solid in the system

We would now have to look at all the setups that we have here and we have to look at it in such a way that we could know if there is a reaction that is going on in any of them as shown.

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The halogens gets less reactive as we move down the group because the atomic mass will increases and the number of the electrons are increases.

The halogens get less reactive as we move top to bottom in the group in the periodic table as the atomic mass of the group 17 elements that is halogens will increases and as we move from  from top to bottom in the periodic table the electrons are added and the number of electrons are increases.

This is reason , that the reactivity of the group 17 elements that is halogens will decreases as we move from top to bottom.

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Answer: The molecular formula of the molecule is [tex]CH_3OH[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

The given compound contains one carbon atom, four hydrogen atoms and one oxygen atom.

It is an alcohol with functional group -OH and with molecular formula of [tex]CH_3OH[/tex] named as methanol.

The molecular formula of the molecule is [tex]CH_3OH[/tex]

The molecular formula of the molecule in figure 3 is [tex]CH_3OH[/tex].

The following information should be considered:

Therefore we can conclude that the molecular formula of the molecule in figure 3 is [tex]CH_3OH[/tex].

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To find a proton number, we can use the Periodic Table of the Elements.

The Periodic Table of the Elements is a table that organizes all discovered chemical elements in rows and columns according to the increasing atomic number.

To find the numbers of protons using this periodic table, first, we have to find the element on the periodic table. Using the columns (group) or rows (period) can make the element easier to find on the table.

Second, find the element’s atomic number, which is located above the element symbol, in the upper left-hand corner of the square. This atomic number will tell us how many protons make up a single atom of that element. For example, Boron (B) has an atomic number of 5, consequently it has 5 protons.

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Answer:

D

Explanation:

there is no new substance formed

Answer:

Magnetic separation

Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.

Explanation:

Separation techniques makes use of the differences in the properties of components of mixtures to separate theses components, one from another.

In a moxturemof iron shavings and sawdust, a suitable separation technique would be the use of magnetic separation.

The use of this separation technique is abasednonnthe principle that when a magnetnis brought near to a mixture containing magnetic and non-magnetic materials, the magnetic materials will be separated from the non-magnetic materials due to their attraction to the magnet. Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.

Answer: Heat is not a form of energy

sound is a form of energy

Explanation:

The molarity of 2. 50 m NaCl solution is 2.68 molal and 48. 2 percent by mass KBr solution is 7.82 m.

Molality = moles solute / kg solvent  

Assume we have 1000 ml of solution.

1000 ml ₓ 1.08 g/ml = 1080 g

Now find the mass of NaCl:

2.50 M NaCl = 2.50 mol/L and 2.50 mol/L x 1 L = 2.50 moles of NaCl

molar mass NaCl = 58.4 g/mol, therefore mass NaCl present = 2.50 mol ₓ 58.5 g/mol = 146 g NaCl

Now find the mass of H₂O:

grams H₂O present = 1080 g - 146 g = 934 g H2O = 0.0.934 kg

We now have moles NaCl and kg H₂O

Molality  = 2.50 mol / 0.934kg = 2.68 molal

48.2% by mass of KBr means 48.2 g KBr / 100 g solution

To find molality, we need moles of KBr and kg of H₂O.  We can easily find he moles of KBr from the mass and the molar mass.

If we have 100 g solution, 48.2 g is KBr so the rest is H₂O.

100 g - 48.2 g = 51.8 g H₂O and this is equal to 0.0518 kg H₂O

Moles KBr = 48.2 g KBr ₓ 1 mol KBr/119 g = 0.405 moles KBr

Molality = 0.405 moles KBr / 0.0518 kg H₂O = 7.82 m

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Answer:

yung una po

Explanation:

kasi meron yan sa grade 6

Answer:

The Answer Is B The Sun,The Moon,And Earth Are In A Straight Line

Explanation:

Hope This Helps!

The total pressure exerted by the gas mixture is 74 kPa.

Hydrogen is an odorless, colorless, and tasteless gas that is the most abundant element in the universe. It is the lightest of all elements and is a component of many compounds, such as water and hydrocarbons. Hydrogen has the highest energy content of any common fuel, making it an attractive energy source. Additionally, it is utilised in the manufacture of fertiliser, polymers, and pharmaceuticals as well as a propellant.

This is calculated by adding up the partial pressures of each individual gas in the mixture, which in this case is 20 kPa for oxygen, 40 kPa for nitrogen, and 14 kPa for hydrogen. 20 + 40 + 14 = 74

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Answer:

There are several methods that can be used to prevent or slow corrosion:

Coatings: Applying a protective coating to a metal surface can prevent corrosion by creating a barrier between the metal and the environment. Common types of coatings include paint, galvanizing, and electroplating.

Cathodic protection: Cathodic protection involves applying a current to a metal surface in order to reduce the potential difference between the metal and its environment. This can help to prevent corrosion by reducing the electron flow that drives the corrosion reaction.

Inhibitors: Corrosion inhibitors are chemical substances that can be applied to a metal surface to slow or prevent corrosion. These substances work by reacting with the metal surface or the environment to form a protective film or layer.

Passivation: Passivation is a process that involves removing surface contaminants and oxide layers from a metal surface in order to improve its corrosion resistance. This can be achieved through chemical or mechanical means.

Materials selection: Choosing corrosion-resistant materials for specific applications can help to prevent or slow corrosion. For example, stainless steel is a commonly used material for corrosive environments because of its high resistance to corrosion.

Environmental control: Controlling the environment in which a metal object is used can also help to prevent or slow corrosion. For example, reducing humidity or keeping a metal object dry can help to prevent corrosion.

Maintenance: Regular maintenance, such as cleaning and inspection, can help to identify and address corrosion issues before they become severe. This can include removing corrosion products, repairing damage, and applying protective coatings as needed.