How much heat is absorbed when 90.5 g of ice is heated from -11.0 °C to 145.0 °C?

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Zn₃(PO₄)₂ is the chemical formula for zinc phosphate.

The chemical formula of a compound means the symbolic representation of the composition of a compound.

Zn₃(PO₄)₂ is the chemical formula for zinc phosphate.

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Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.

Enzymes lower the activation energy level of a chemical reaction, thus making it so the reaction will proceed.

Enzymes are proteins that help speed up chemical reactions in our bodies.

Enzymes are proteins that speed up the rate of a chemical reaction without being used up during the reaction.

They are biological catalysts. Catalysts, as we know lower the activation energy for reactions and speed them up.

The lower the activation energy for a reaction, the faster the rate.

Thus enzymes speed up reactions by lowering the activation energy.

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Answer:

[tex]\boxed{2.8 \, \%}[/tex]

Explanation:

[tex]\text{Percent error} = \dfrac{\lvert \text{Measured - Actual}\lvert}{ \text{Actual}} \times100 \, \%[/tex]

Data:

Predicted = 17.4 cm

     Actual = 17.9 cm

Calculation:

[tex]\text{Percent error} = \dfrac{\lvert 17.4 - 17.9\lvert}{17.9} \times 100 \, \% \\\\= \dfrac{\lvert-0.5\lvert}{17.9} \times 100 \, \% = \dfrac{0.5}{17.9} \times 100 \, \% \\\\= 0.028 \times 100 \, \% = \textbf{2.8 \%}\\\\\text{The percent error in the measurement is } \boxed{\textbf{2.8 \%}}[/tex]

Answer:

a.

Explanation:

Answer:

Harmony is correct, because Mendeleev’s model made predictions that came true.

Explanation:

Mendeleev published periodic table.

Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.

Our answer is : Harmony is correct, because Mendeleev’s model made predictions that came true.

Answer:

Harmony is correct, because Mendeleev’s model made predictions that came true.

Explanation:

Answer:

[tex]\boxed{\text{SnBr}_{4}}[/tex]

Explanation:

The name tells you that this is a binary compound (contains two elements).

It contains a metal and a nonmetal, so it is a binary ionic compound. The general rule is:

Name of compound = name of metal  name of ion (two words)

Name of metal = tin(IV), so the tin ion has a charge of 4+

Name of ion = bromide. Br is in Group 17, so bromide ion has charge of 1-.

[tex]\rm Sn$^{4+}$ + 4Br$^{-} \longrightarrow \,$ SnBr$_{4}$\\\\\text{The formula is} \boxed{\textbf{SnBr}_{4}}[/tex]

Answer:

2H3PO4 + 3Ca(OH)2 = Ca3(PO4)2 + 6H2O

3CaO + P2O5 = Ca3(PO4)2

Explanation:

1) When phosphoric acid reacts with calcium hydroxide neutralization reaction takes place in which calcium phosphate is formed along with formation of water.

The balanced chemical equation is give as:

[tex]2H_3PO_4+3Ca(OH)_2\rightarrow Ca_3(PO_4)_2+6H_2O[/tex]

2) When calcium oxide acid reacts with phosphorus pentoxide addition reaction takes place in which calcium phosphate is formed.

The balanced chemical equation is give as:

[tex]3CaO+P_2O_5\rightarrow Ca_3(PO_4)_2[/tex]

Answer:

Because No New Substance if Formed!

Explanation:

When ice melts, it is still considered to be water, it's just no longer a solid. The molecules of water do not become something else and simply just change phases. A chemical reaction requires that a new substance be formed, for example when you burn paper, a new substance is formed. Also melting ice is reversible, you can just freeze it again, while chemical reactions cannot be reversed!

Answer:the empirical formula is C3H8O2

Explanation:

You need to determine the relative number of moles of hydrogen and carbon. So you first calculate the molar mass of CO2 and H20 Atomic weight of carbon = 12.0107 Atomic weight of hydrogen = 1.00794 Atomic weight of oxygen = 15.999 Molar mass CO2 = 12.0107 + 2 * 15.999 = 44.0087 Molar mass H2O = 2 * 1.00794 + 15.999 = 18.01488 Now calculate the number of moles of CO2 and H2O you have Moles CO2 = 2.086 g / 44.0087 g/mole = 0.0474 mole Moles H2O = 1.134 g / 18.01488 g/mole = 0.062948 mole Calculate the number of moles of carbon and hydrogen you have. Since there's 1 carbon atom per CO2 molecule, the number of moles of carbon is the same as the number of moles of CO2. But since there's 2 hydrogen atoms per molecule of H2O, The number of moles of hydrogen is double the number of moles of H2O Moles Carbon = 0.0474 Moles Hydrogen = 0.062948 * 2 = 0.125896 Now we need to determine how much oxygen is in the compound. Just take the mass of the compound and subtract the mass of carbon and hydrogen. What's left will be the mass of oxygen. Then divide that mass by the atomic weight of oxygen to get the number of moles of oxygen we have. 1.200 - 0.0474 * 12.0107 - 0.125896 * 1.00794 = 0.503797 Moles oxygen = 0.503797 / 15.999 = 0.031489 So now we have a ratio of carbon:hydrogen:oxygen of 0.0474 : 0.125896 : 0.031489 We need to find a ratio of small integers that's close to that ratio. Start by dividing everything by 0.031489 (selected because it's the smallest value) getting 1.505288 : 3.998095 : 1 The 1 for oxygen and the 3.998095 for hydrogen look close enough. But the 1.505288 for carbon doesn't work. But it looks like if we double all the numbers, we'll get something close to an integer for everything. So do so. 3.010575 : 7.996189 : 2 Now this looks good. Rounding everything to an integer gives us 3 : 8 : 2 So the empirical formula is C3H8O2

Answer: How many moles of HCl was produced?

⇒ 0.261 moles of HCl

How many moles of MgCl2 reacted?

⇒ 0.131 moles of MgCl2

What mass of MgCl2 reacted?

⇒ 12.4 g MgCl2

Explanation:

i just did it

Answer: (i) 0.261 moles of HCl, (ii) 0.131 moles of [tex]MgCl_2[/tex] and (iii) 12.5 grams of [tex]MgCl_2[/tex]

Explanation: The balanced equation for the formation of HCl by the reaction magnesium chloride with water is:

[tex]MgCl_2+2H_2O\rightarrow 2HCl+Mg(OH)_2[/tex]

From above balanced equation, there is 1:2 mol ratio between magnesium chloride and HCl.

As per the given information, 5.85 L of HCl gas is produced. here, temperature and pressure is not mentioned, so let's assume STP conditions.

At STP, volume of 1 mol of a gas is 22.4 L. With the help of this, we can calculate the moles of HCl present in 5.85 L.

[tex]5.85LHCl(\frac{1mol}{22.4L})[/tex]

= 0.261 mol HCl

As there is 1:2 mol ratio between magnesium chloride and HCl, we can calculate the moles of magnesium chloride from the above calculated moles of HCl as:

[tex]0.261molHCl(\frac{1molMgCl_2}{2molHCl})[/tex]

= 0.131 mol [tex]MgCl_2[/tex]

Molar mass of magnesium chloride is given as 95.2 gram per mol. On multiplying the moles by molar mass we can calculate its mass reacted.

[tex]0.131molMgCl_2(\frac{95.2g}{1mol})[/tex]

= 12.5 g [tex]MgCl_2[/tex]

Answer:

20.9 kJ.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat released to water (Q = ??? J).

m is the mass of water (m = 100.0 g).

c is the specific heat capacity of solution (c = 4.18 J/g.°C).

ΔT is the difference in T (ΔT = final temperature - initial temperature = 75.0°C - 25.0°C = 50.0°C).

∴ Q = m.c.ΔT = (100.0 g)(4.18 J/g.°C)(50.0°C) = 20900 J = 20.9 kJ.

Answer:

9

Explanation:

atomic mass = number of protons + number of neutrons = 4+5 = 9 amu

Answer:

9

Explanation:

5 neutrons + 4 electrons = 9. We don't use protons in the calculation because the mass is so small that it can be ignored. Good luck ◕‿◕

Answer:

²³⁵₉₂U

Explanation:

Properly writing the equation we have:

       ²³⁹₉₄Pu → ᵃₙX + ⁴₂He

The unknown atom here is X with mass number "a'' and atomic number ''n''

In balancing chemical equations, the mass number and atomic number must be conserved. This implies that the sum of atomic numbers i.e subscript on the left hand side must be equal to that on the right hand side. Also, the sum of the mass numbers i.e superscript on the left hand side must be equal to that on the right hand side.

For the mass numbers:

       239 = a + 4

      a = 239 - 4 = 235

For atomic numbers:

     94 = n + 2

      n = 94 -2 = 92

The atom X, has a mass number of 235 and an atomic number of 92.

This is can be written as ²³⁵₉₂X

This is option 3

Answer:

They are all made of carbon

Explanation:

Diamond, graphite, and fullerenes are all made of carbon.

Hope this helps!

Diamond, graphite, and fullerenes "Are all made of carbon".

The crystal structure known as diamond cubic would be used to describe the solid form of something like the element carbon known as diamond.

Due to its resemblance to the appearance of a soccer ball, fullerenes with a spherical shape are frequently described as "buckyballs" or Buckminster fullerenes.

Therefore, the correct answer is an option (A)

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There are 6.88 g of carbon in 16.03 g sample of carbon monoxide.

Carbon monoxide has formula as CO.

C => carbon

O => oxygen

From the question given above, we were told that there is always 1.33 g of oxygen for every 1 g of carbon. Thus,

O = 1.33C ............. (1)

We were also told that the mass of CO is 16.03 g i.e

C + O = 16.03 ........... (2)

O = 1.33C ............. (1)

C + O = 16.03 ........... (2)

From the equation above, we can obtained the mass of Carbon (C) as follow:

C + O = 16.03

O = 1.33C

C + 1.33C = 16.03

2.33C = 16.03

Divide both side by 2.33

C = 16.03 / 2.33

C = 6.88 g

Therefore, 16.03 g of the sample of carbon monoxide contains 6.88 g of carbon.

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Answer:

101,300 kPa.

Explanation:

It is known that:

760 mm Hg = 101,300 kPa.

760 mm Hg = 1.0 atm.

So, the right choice is: 101,300 kPa.

Answer:

d. synthesis

Explanation:

it uses the formula a+b=ab.

Answer:

synthesis

Explanation:

A + B → AB

A simple example of a synthesis reaction is the formation of water from its elements, hydrogen, and oxygen:

2 H2(g) + O2(g) → 2 H2O(g)

C) It goes up by one

Answer:

C

Explanation:

your cleaning items have chemicals batteries have chemicals.

Chemicals are in many substances in a home.

(c) Chemicals are in many substance in home is the true statement

It can be explained by an example

A coffee we use in home contains chemicals such as

Acetaldehyde , Tannin , Thiamin

these all are the chemicals used in coffee beans.

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When more products are added to a weak base dissociation equilibrium, the equilibrium will shift to the left, favoring the reactants and causing the concentration of products to increase.

When more products are added to a weak base dissociation equilibrium, the equilibrium will shift to the left, favoring the reactants. This is because the introduction of more products will cause the reaction to use up some of the reactants to form more products, in order to reach a new equilibrium. Therefore, the concentration of products would increase, and the concentration of reactants would decrease.

Final answer:

When more products are added to a weak base dissociation equilibrium, the concentration of products would increase.

Explanation:

When more products are added to a weak base dissociation equilibrium, the equilibrium will shift to favor the reactants, resulting in an increase in the concentration of products. This is in accordance with Le Chatelier's Principle, which states that a system at equilibrium will adjust to counteract any changes imposed on it. Therefore, the correct answer is option D: The concentration of products would increase.

Are there any answer choices? If not, here are some possible responses you may see (that are correct, of course):

*It is used in the process of decomposition.

*It is used to release ammonia from dead animals that ultimately gets turned into nitrogen-based substances.

*It involves the formation of nitrates into nitrogen to complete the nitrogen cycle.

I hope I helped!

If you find the answer choices, just comment them down below and I will gladly tell you which one is correct. :)

Answer:

Thermochemistry

Explanation:

Thermochemistry is the area of study in chemistry that is concerned with the heat transfers that occur during chemical reactions.

Answer:

Volume  only intrinsic

Explanation:

Hello! My name is Zalgo and I am here to help you out today. The most common form of matter in the universe would be "Plasma".  Plasma is gas that is heated a lot so it turns into high energy (high energy would be said "Plasma").

I hope that this helps! :D

"Stay Brainly and stay proud!" - Zalgo

(By the way, do you think you could mark me as Brainliest? I'd greatly appreciate it! Thanks XP)

Answer:

two oxygen atoms covalently bonded to a single carbon atom.

Explanation:

Please mark brainliest and have a great day!

Answer:

Carbon, and two Oxygen atoms

Explanation:

CO2, or Carbon Dioxide is made up of one Carbon (C) atom, and two Oxygen (O) atoms.

Answer:

A positively charged subatomic particle

Answer:

188 grams

Explanation:

molarity = moles per litre

0.320 moles=1 litre

number of moles in 6 litres = (0.320×6)÷1

=1.92 moles

mass=moles ×relative molecular mass

1.92×(2+32+64)= 188

answers= 188 grams

Answer:

The correct answer is 188 grams

The chemist should dissolve 188 grams of H2SO4 in water.

Further Explanation

Molarity is the concentration of a solution in moles per liter. It is calculated by dividing the number of moles of a solution, n by its volume in liters, V. That is; Molarity = n/V

When given the molarity of a solution and the volume of the solution then we can get the number of moles, by multiplying the molarity by volume; n = MV.

The number of moles of a compound or an element can also be calculated by dividing the mass of the compound by its relative molecular mass.

In this case, we are given; volume = 6.00 L and Molarity = 0.320 M

Therefore, we can calculate the number of moles by multiplying volume and molarity.

Number of moles = 6.0 L × 0.320 M

                             = 1.92 moles

Relative molecular mass of H2SO4 is 98.079 g/mol

Mass of the solution = moles × relative molecular mass

                                  = 1.92 moles × 98.079 g/mol

                                  = 188.312 g

                                   ≈ 188 g

Grade: High school

Subject: Chemistry

Chapter: Stoichiometry

Keywords: Molarity, moles,  molecular mass and volume.

Answer:

B) H2O

Explanation:

Compound is a pure substance composed of two or more different atoms chemically bonded to one another. Among all choices only H₂O is composed of two atoms, and other choices are composed of only one atom.  H₂O is the pure substance composed of chemically bonded two atoms (hydrogen atoms and oxygen atom).

Answer:

H₂O

Explanation:

Compound consists of combinations of elements. H (Hydrogen) is an element. O-16 and H-3 are stable isotopes of O (Oxygen) and H (Hydrogen), which are elements. H₂O is compound formed by two elements: Hydrogen and Oxygen.

Answer:

= 51.57 °C

Explanation:

The combined gas equation shows that P₁V₁/T₁=P₂V₂/T₂ where P represents pressure, V represents volume and T absolute temperature

From the information provided in the question,

Since we are finding the initial or original temperature, we can make T₁ the subject of the formula.

T₁=P₁V₁T₂/P₂V₂

P₁=2.0 ATM

P₂= 1.0 ATM

V₁=2.0 L

V₂= 3.5 L

T₁=?

T₂= (11+273) K=284 K

Using these values in the formula:

T₁= (2.0 ATM × 2.0 L× 284 K)/(1.0 ATM × 3.5 L)

=324.57 K

324.57-273= 51.57 °C

Answer:

True

Explanation:

Ice floats on water, for water is more dense than ice, allowing water to "support" the ice on top.

Iron nail, on the other hand, is more dense than water, allowing the nail to sink.

Answer: True an iron nail is more dense than the water and Ice the ice is less dense than the water making it float. Hopes this helps :)