3.
Balance the following reactions.
i)
Mg +
HCI →
MgCl2 +
H2
ii)
Mg(OH)2 +_
HCI →
MgCl2 +
H20
AgNO3 +
K3PO4 →
Ag3PO4 +
KNO3
iv)
H2SO4 +
Pb(OH)4 →
Pb(SO4)2 +
H2O
v)
Ca (OH)2 +
H3PO4 →
Ca3(PO4)2 +
H20​

Answer:

thanks

Explanation:

Answer:

Whether a chemical reaction absorbs or releases energy, there is no overall change in the amount of energy during the reaction. That's because energy cannot be created or destroyed. This is the law of conservation of energy.

Answer:

63.25 grams of CO₂

Explanation:

To convert from liters to grams, we first need to convert from liters to moles. To do this, we divide the liters by 22.4, the amount of liters of a gas per mole.

32.2 / 22.4

= 1.4375 moles of CO₂

Now we want to convert from moles to grams. To do this, we multiply the moles by the molar mass of CO₂. The total molar mass can be found on the periodic table by adding up the molar mass of carbon (12) and two oxygen (32).

12 + 32 = 44

Now we want to multiply the moles by the molar mass.

1.4375 • 44

= 63.25 grams of CO₂

This is your answer.

Hope this helps!

[tex]\text{mass of NaOH = 2.90 × 10²² NaOH formula units} × \frac{\text{1 mol NaOH}}{\text{6.022 × 10²³ NaOH formula units}} × \frac{\text{40.0 g NaOH}}{\text{1 mol NaOH}}[/tex]

[tex]\boxed{\text{mass of NaOH = 1.926 g}}[/tex]

Answer:

[tex]\boxed {\boxed {\sf 1.93 \ g \ NaOH}}[/tex]

Explanation:

1. Convert Formula Units to Moles

To do this, we use Avogadro's Number: 6.02*10²³. It is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, it is formula units of sodium hydroxide.

[tex]\frac {6.02*10^{23} \ formula \ units \ NaOH}{1 \ mol \ NaOH}[/tex]

Multiply by the given number of formula units.

[tex]2.90*10^{22} \ formula \ units \ NaOH*\frac {6.02*10^{23} \ formula \ units \ NaOH}{1 \ mol \ NaOH}[/tex]

Flip the ratio so the formula units will cancel.

[tex]2.90*10^{22} \ formula \ units \ NaOH*\frac {1 \ mol \ NaOH}{6.02*10^{23} \ formula \ units \ NaOH}[/tex]

[tex]2.90*10^{22}*\frac {1 \ mol \ NaOH}{6.02*10^{23}}[/tex]

[tex]\frac {2.90*10^{22} \ mol \ NaOH}{6.02*10^{23}}=0.04817275748 \ mol \ NaOH[/tex]

2. Convert Moles to Grams

For this, we use the molar mass. It is the grams per mole of a substance. We are given this value for sodium hydroxide: 40.0 g/mol

[tex]\frac {40.0 \ g\ NaOH}{1 \ mol \ NaOH}[/tex]

Multiply by the moles we calculated.

[tex]0.04817275748 \ mol \ NaOH*\frac {40.0 \ g\ NaOH}{1 \ mol \ NaOH}[/tex]

The moles cancel.

[tex]0.04817275748 *\frac {40.0 \ g\ NaOH}{1 }[/tex]

[tex]0.04817275748 *{40.0 \ g\ NaOH=1.926910299 \ g\ NaOH[/tex]

3. Round

The original measurement of formula units has 3 significant figures, so our answer must have the same. For the number we calculated that is the hundredth place.

[tex]1.92\underline6 910299 \ g \ NaOH[/tex]

The 6 in the thousandth place tells us to round the 2 to a 3.

[tex]1.93 \ g \ NaOH[/tex]

There are approximately 1.93 grams of sodium hydroxide.

Answer:

Upwelling is the natural process which brings cold, nutrient-rich water to the surface. A huge upwelling regularly occurs off the coast of Peru, which enjoys a large fishing industry as a result. Upwelling is a process in which currents bring deep, cold water to the surface of the ocean.

Explanation:

good luck

Answer:

Therefore Mass of 6.022 x10^23 molecules= 32 g.

Explanation:

Answer:

True

Explanation:

Answer:

Colour of litmus papers in lemon:

Blue litmus- Red

Red litmus- No change

Really sorry but don't know about others

Litmus paper indicator shows following color  changes for lemon it is, blue litmus to red, for ash and blood  it is red litmus to blue  indicating their acidic nature in case of lemon and alkaline nature in case of ash and blood.

Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.

These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:

1) natural indicators

2) synthetic indicators

3) olfactory indicators.

These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.

Learn more about indicators,here:

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Answer:

c

Explanation:

Involuntary muscles, like skeletal muscles, help move the bones

Answer:

the second and last one is correct

since bones protect our internal organs like heart, pancreas,etc and give the body its shape

Explanation:

second point it is true that in our body there are more than 600 muscles and the bones are about 206 I think

Answer:

The correct answer is -

3-methoxypentanoic acid, and

4-chlorobenzoic acid

Explanation:

1. condensed formula of the molecule is -

CH3CH2CH(OCH3)CH2COOH and the number of the carbons would be count from the end of carboxylic acid. So, the counting as given in the image, it shows there are 5 carbon so it is Penta and has methyl group on fourth carbon so 4-methyl, therefore, its IUPAC name will be - 4-methyl pentanoic acid

2. similarly for the molecule with COOH group attached with ring carbon and chlorine is represented as in the image and it shows a benzene ring and COOH group is present at C1 and chlorine is in C4 so the name would be 4-chlorobenzoic acid.

The International Union of Pure and Applied Chemistry (commonly abbreviated to IUPAC) recommends a systematic approach for the nomenclature of organic compounds, which is referred to as the IUPAC nomenclature of organic compounds. Here the IUPAC names are 4-methyl pentanoic acid and 4-chlorobenzoic acid.

In essence, the condensed structural formula is a system for writing organic compounds in a single line of text.

1. CH₃CH₂CH(OCH₃)CH₂COOH and the number of the carbons would be counted from the end of carboxylic acid. So, the counting as given in the image shows there are 5 carbon so it is Penta and has methyl group on the fourth carbon so 4-methyl, therefore, its IUPAC name will be - 4-methyl pentanoic acid

2. Similarly the molecule with COOH group attached with ring carbon and chlorine is represented as in the image and it shows a benzene ring and COOH group is present at C-1 and chlorine is in C-4 so the name would be 4-chlorobenzoic acid.

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Answer:

1 moles Calcium Fluoride = 78.0748064 gram using the molecular weight calculator and the molar mass of CaF2.

Answer:

Chemical waste from factories is sometimes dumped into rivers and lakes, or directly into the ground. Pesticides (chemicals that kill insects) applied to farmland enter surface water and groundwater, often in large quantities. Leaks from underground storage tanks for liquids like gasoline go directly into groundwater.

Explanation:

Hope it helps! Correct me if I am wrong!

Im sure about my answer!

If you dont mind can you please mark me as brainlest?

Answer:

d. NaOH Sodium hydroxide soluble

Yes it is an cleaning product

Answer:

yes

Explanation:

it cleans in the house

Answer:

your answer is D. 57.6

Explanation:

730+30.0+25+2=

C8H16O8

Explanation:

(CH2O)n=240.2

=12n+2n+16n=240.2

=30n=240.2

n=8

C8H16O8

Answer:

Energy is transferred between trophic levels when one organism eats another and gets the energy-rich molecules from its prey's body.

Explanation:

The flow of energy in an ecosystem is always linear ie uni direction. At each energy step in food chain, the energy received by the organisms is used for its own metabolism and maintenance. The left over energy is passed to next higher trophic level. Thus the energy flow decreases with successive trophic level.

Answer:

Pb(NO3)2

Cd(NO3)2

Na2SO4

Explanation:

In the first part, addition of HCl leads to the formation of PbCl2 which is poorly soluble in water. This is the first precipitate that is filtered off.

When the pH is adjusted to 1 and H2S is bubbled in, CdS is formed. This is the second precipitate that is filtered off.

After this precipitate has been filtered off and the pH is adjusted to 8, addition of H2S and (NH4)2HPO4 does not lead to the formation of any other precipitate.

The yellow flame colour indicates the presence of Na^+ which must come from the presence of Na2SO4.

Answer:

The reaction will proceed to the right and produce more products.

Explanation:

The reaction produces heat, so it is exothermic. If you remove heat, the reaction counters that by producing more products and replacing the heat that was lost.

Answer:

3.43 moles

Explanation:

To convert moles into grams you must take the number of grams and divide it by the atomic mass of the compound.

in this case, grams is 151 and N2O has an atomic mass of 44.013

so your equation would look like

151/44.013=3.430804535

your answer would be 3.43 moles

the answer ie the second option

Minerals oil

Answer:

Endocrine glands release chemicals that are also known as hormones.

Explanation:

Hope this helped!!!

Answer:

D. Hormones

Explanation:

The Endocrine system deals with all things hormones such as growth development and anything else dealing with puberty

Answer:

By walking and stuff, duh.

Explanation:

We walk, motion.

We drive, motion.

We eat, motion.

We talk, motion.

Answer: Biocapacity is the ecosystems' capacity to produce biological materials used by people and to absorb waste material generated by humans, under current management schemes and extraction technologies.Biocapacity is usually expressed in global hectares.

Explanation:

Answer:

position

Explanation:

The position of an object is its location in a space.

Answer:

NaOH + HCl → H2O and NaCl.

Explanation:

plzz mark as brainliest

Answer:

NaOH + HCl → H2O and NaCl.

Explanation:

I'm not sure 100%, but I think so...