Extra points if anyone can help me with those 2

Answer:

Explanation: it is true

Answer:

omoih

Explanation:

Answer:

B. Na+ and O2-

Explanation:

Na+ plus has 10 electrons and O2- also has 10 electrons

Answer:

Humans and trees are interdependent - we breathe in oxygen and breathe out carbon dioxide, while trees take in carbon dioxide and release oxygen.

Humans have about a thousand genes similar to those of bacteria, presumably because the genes are so vital that their DNA structure has remained much the same over millions of years of descent from a common ancestor.

Explanation:

Answer:

The hotter the substance, the more its molecules vibrate, and therefore the higher thermal energy

:)

Answer: Hot water has more thermal energy because the particles are farther apart thus they are moving faster. As particles move faster their thermal energy increases.

Explanation: Look in answer

Answer: combustion reaction

[tex]C_{25}H_{52}+38O_2\rightarrow 25CO_2+26H_2O[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.

The balanced chemical equation is:

[tex]C_{25}H_{52}+38O_2\rightarrow 25CO_2+26H_2O[/tex]

The given reaction is a combustion reaction as in a combustion reaction , a susstaance is oxidized in the presence of oxygen to give carbon dioxide and water.

Answer:

The rate determining step is step 1

Explanation:

In the rate law for the given reaction,

So, option C is correct one.

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Answer:

hello to get it from you and your favouri love your pic

Answer:

39.948 u

Explanation:

Answer:

hydrogen atom and oxygen atom

Answer:

1) KI

2) Mg3P2

3) Ag2S

4) FeBr3

5) Mg(OH)2

6) Na2SO4

7) Pb(NO3)4

8) (NH4)2CO3

Answer:

a

Explanation:

Answer:

Option D

Explanation:

A and B both make sense to some level.

For option A,trees can only move while bacteria and humans can both move and locomote so there's that similarity

For option B,humans and plants are not micro organisms but bacteria are so there's that similarity

Option C is just not true

Option D is the right answer thus both humans and animals are eukaryotes

Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.

Explanation:

Answer:

6.0 moles

Explanation:

The thing to remember about balanced chemical equations is that the stoichiometric coefficients added to each chemical species that takes part in the reaction are equivalent to moles.

I think its 10 moles, hope this helps.

Answer:

The key to understanding water's chemical behavior is its molecular structure. A water molecule consists of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons

Explanation:

Hope it helps

Answer:

5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.

Answer:

Different uses of Metals

Metals are usually very strong, most durable and highly resistant to everyday wear and tear. As such, they have been used since ancient times for a lot of things. And even today with advances in technology and a lot of other things the uses of metals have broadened greatly. Metals even play a key role in the economy. Let’s look at some important and popular metals uses.

In the Construction Industry

In electronics

In medicine

Machinery, Refractory and Automobiles

Decorative products

Other Uses

In the Construction Industry

Metals are the main component in the construction industry. Metals like iron, steel amongst others are the main materials used in construction of buildings and even homes.

In Electronics

Another important application of metals are in electronics. As metals are good conductors of electricity, they are used to making wires and parts for equipments and gadgets that function on electrical current. Popular examples include, TV, mobiles, fridge, iron, computers etc.

In medicine

If you are wondering how, well from a biological perspective metals are found as micro-elements in our bodies. Besides, the presence of metal elements is crucial for several functions like transmission of nerve impulses, oxygen flow, reaction between enzymes etc. Some medicines are therefore liaised with metal compounds to treat certain deficiencies or sickness. Metals like, iron, calcium, magnesium, potassium titanium, and aluminum are used commonly in medicine in the form of antacids.

Apart from this, most of the equipments and tools used are made from metals.

Machinery, Refractory and Automobiles

This is one of the most common use of metals. They are used extensively in manufacturing machines for industries, agriculture or farming and automobiles which include road vehicles, railways, airplanes, rockets etc. Here, the commonly used metals are iron, aluminum and steel.

Besides these, most of the utensils that is used in the kitchen are made from metals like steel, aluminum, and copper. Due to a high temperature withstanding nature metals are preferred the most.

Decorative products

Metals such as platinum, gold, and silver come under the category of precious metals and have high economical value. These metals are widely used in making jewellery sets or for some decorative piece.

Other Uses of Metals

Some other uses and applications of metals are, they play an important role in security as the metals are used in making locks, strong safe, doors etc. Apart from this, furnitures are made from metal these days. Metals also find their uses in the military where they are used to manufacturing weapons and ammunitions. Some metals are used in galvanizing to protect from rusting.

These are some popular uses of metal. To know more about metals, different types, properties of metals and more you can keep visiting BYJU’S or you can also download our app for interesting content and learning experience

The order in which the substances will reach 90.0°C is; Ag, Zn, Fe, Al.

The term specific heat capacity refers to the quantity of heat that is required to raise the temperature of an object by 1K. The higher the heat capacity, the greater the heat that is required for the object to reach 90.0°C.

The order in which the substances will reach 90.0°C is; Ag, Zn, Fe, Al. We can see that Ag has the lowest heat capacity and the first to reach 90° while All has the highest heat capacity and the last to reach 90°.

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Answer:

0.0123 M/s

Explanation:

The reaction rate is the rate at which the reaction takes place and results in an increased concentration of the products. The rate of the reaction is 0.0123 M/s.

The reaction rate is the increase of the concentration of the product with respect to time in seconds. The rate of reaction is given by,

[tex]\rm rate = \rm \dfrac {\Delta C}{\Delta t}[/tex]

Given,

Change in product concentration = 1.478

Time period = 120 seconds

Substituting values in the above equation:

[tex]\begin{aligned} \rm rate &= \rm \dfrac {\Delta C}{\Delta t}\\\\& = \dfrac{1.478}{120}\\\\&= 0.0123 \end{aligned}[/tex]

Therefore, option B. 0.0123 M/s is the reaction rate.

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Answer:

moist air is less dense than dry air because water has a lower molecular weight than nitrogen and oxygen

Answer:

Water vapor is a relatively light gas when compared to diatomic Oxygen and diatomic Nitrogen. Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.

Answer:

Alcohol, 0.63 I don't know the rest the rest

Explanation:

Answer:

Explanation:

1. Alcohol

2. Marker 1

3. Purple

4. Marker 2

Filling out the lab paper gives you the answers. These were all correct.

Answer:

Soil is a mixture of minerals, dead and living organisms (organic materials), air, and water.

Explanation:

Dead organisms decompose(kind of like fertilizer)

water comes from nearby watersheds, precipitation processes, etc.

Answer:

Soil is made up of three main components – minerals that come from rocks below or nearby, organic matter which is the remains of plants and animals that use the soil, and the living organisms that reside in the soil. The proportion of each of these is important in determining the type of soil that is present.

Answer:

D

Explanation:

all ya got to do is divide the moles from the solution... so 3.0 divided by 0.25. put it in a calculator

hope this helps

The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.

Molarity of a given solution is known as the total number of moles of solute per litre of the solution.  A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

The unit of molarity is mol L⁻¹.

Molarity is temperature dependent because as temperature changes, volume of the solution also changes.

Given,

3.0 moles of Saline (NaCl)

Volume of solution = 0.25L

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

Molarity = 3 ÷ 0.25 = 12 M

Therefore, The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.

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Answer:

false

Explanation:

different things will have different melting points

Answer:

on the surface of lakes

Explanation: