True or false. It is safe to heat flammable liquids with a hot plate as long as it’s done in a fume hood.

Answer:

Hydrochloric acid + sodium hydroxide -> sodium chloride + water

Sulphuric acid + copper hydroxide -> copper sulphate + water

Nitric acid + sodium hydroxide -> sodium nitrate + water

Hydrochloric acid + calcium hydroxide -> calcium chloride + water

Sulphuric acid + potassium hydroxide -> potassium sulphate + water

Hydrochloric acid + lithium hydroxide -> lithium chloride + water

Nitric acid + magnesium hydroxide -> magnesium nitrate + water

Answer:

Calcium as an element is found only in living creatures, but its ores are abundant and the major mined ores are calcite, dolomite, gypsum and anhydrite.

Answer:

Molar mass of KClO₃ = (39 + 35.5 + 16×3) g/mol = 122.5 g/mol

Molar mass of KCl = (39 + 35.5) g/mol = 74.5 g/mol

Balanced equation for the reaction:

2KClO₃ → 2KCl + 3O₂

Mole ratio KClO₃ : KCl = 2 : 2

Moles of KClO₃ reacted = (2.73 g) / (122.5 g/mol) = 0.0223 mol

Moles of KCl formed = (0.0223 mol) × (2/2) = 0.02229 mol

Mass of KCl formed = (0.0223 mol) × (74.5 g) = 1.66 g

====

OR:

(2.73 g KClO₃) × (1 mol KClO₃ / 122.5 g KClO₃) × (2 mol KCl produced / 2 mol KClO₃) × (74.5 g KCl / 1 mol KCl)

= 1.66 g KCl produced

Answer:

Reactivity increases down the group

Explanation:

This is because metals reaction involves loss of an electron from an occupied orbital.

As we go down the group the relative nuclear charge decreases due to an additional orbit leading to ease in loss of an electron

Due to ease in loss of electrons down the group metals become more reactive down the group

Answer:

The correct answer is H20

Explanation:

A. is the correct answer!

Answer:

[tex] C_2H_2O_6Ca [/tex]

Explanation:

Here we are given that the percentage of ,

And we need to find out the Empirical formula of the compound .

Let's make a table ,

[tex]\boxed{\begin{array}{c|c|c|c|c} \underline{\bf Element} & \underline{\bf Percentage} & \underline{\bf Atomic \ Weight } &\underline{\bf No. \ of \ atoms_{relative} } &\underline{\bf Ratio } \\\\ \sf Ca & \sf 24.7 &\sf 40 &\sf \dfrac{24.7}{40}=0.6 &\sf \dfrac{0.6}{0.6}=1 \\\\\sf H &\sf 1.20 &\sf 1 &\sf \dfrac{1.20}{1}=1.20&\sf \dfrac{1.20}{0.6}=2\\\\\sf C &\sf 14.8 &\sf 12&\sf\dfrac{14.8}{12}=1.23&\sf \dfrac{1.23}{0.6}=2\\\\\sf O &\sf 59.3 &\sf 16 &\sf\dfrac{59.3}{16}=3.7&\sf \dfrac{3.7}{0.6}=6 \end{array}}[/tex]

Therefore we got the ratio of Ca , H , C and O as 1:2:2:6 . Therefore the Empirical formula of the compund will be ,

[tex]\longrightarrow\underline{\boxed{\bf Empirical \ formula = C_3H_2O_6 Ca }}[/tex]

The empirical formula of the compound is written as C₂H₂O₆Ca.

The empirical formula of a compound is the simplest structural formula of the compound.

Fraction of the elements in the given compound;

Ca, = 24.7/40 = 0.62

H, = 1.2/1 = 1.2

C, = 14.8/12 = 1.23

O, = 59.3/16 = 3.7

Ca: = 0.62/0.62 = 1

H: = 1.2/0.62 = 2

C: = 1.23/0.62 = 2

O: = 3.7/0.62 = 6

Thus, the empirical formula of the compound is written as C₂H₂O₆Ca.

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Answer:Its c

Explanation:

Let us use a double displacement reaction of Lead (II) Nitrate and Potassium Chromate to produce Lead (II) Chromate and Potassium Nitrate to practice balancing an equation.

We begin with the base equation provided in the question.Pb(NO3)2(aq)+K2CrO4(aq)→PbCrO4(s)+KNO3(aq)

Looking at the the atom inventory ReactantsPb=1NO3=2

K=2CrO4=1

Products

Pb=1

NO3=1

K=1

CrO4=1

We can see that the

Kand NO3

are imbalanced.

If we add a coefficient of 2 in front of the

KNO3

this will balance the equation.

Pb(NO3)2(aq)+K2CrO4(aq)→PbCrO4(s)+2KNO3(aq)

Explanation:

option A skeleton system is correct option

hope this helps you !

Answer:

I think it's called the boiling point

Explanation: Hope this helps:)

Answer:

The temperature at which a liquid becomes a gas is the boiling point

Answer: Zero-emission vehicles have no tailpipe emissions, no emissions from gasoline, and no emission-control systems, which deteriorate over time.

Explanation:

Transport media acts as a significant pollution source by releasing gasses and particles. Therefore, automobile makers should adhere to quotas for zero-emission vehicles set by states even if this causes automakers to lose revenue

Cars, trucks, and buses mostly run on electricity. Now, the pollution caused by these vehicles is largely reduced compared with ordinary vehicles due to the reduction in fuel use which results in a reduction in gasses and other substances emissions.

There are three kinds of zero-emission vehicles Hybrids vehicles, Fully electric vehicles, and Hydrogen cells. Currently, transport media are the most significant sources of gasses and other polluting components emissions that lead to an enhancement in the greenhouse effect and global warming.

All primary pollutants in the air can produce secondary pollutants. The pollutants could be considerably reduced by substituting transport media or modifying the combustion processes.

A significant reduction in pollutants from Zero-Emission Vehicles has been proven in many countries.

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Answer:

Strong intermolecular forces produce a lower rate of evaporation and a lower vapor pressure. Weak intermolecular forces produce a higher rate of evaporation and a higher vapor pressure. As the temperature increases, the vapor pressure increase

Reaction three is the single replacement reaction.

A single displacement or replacement reactions are the exchange of a single element with another compound or element.

The first reaction is a combination reaction as the water and oxygen combines togetherly to produce hydrogen peroxide and hence is incorrect.

The second reaction is a decomposition reaction in which the reactant [tex]\rm Al_{2}S_{3}[/tex] breaks into two products [tex]\rm 2Al[/tex] and  [tex]3\rm S[/tex].

The third reaction is the single replacement reaction as more reactive [tex]\rm Cl_{2}[/tex] displaces [tex]\rm Br[/tex] from the potassium to produce [tex]\rm 2KCl[/tex] and [tex]\rm Br_{2}[/tex].

The fourth reaction is a combustion reaction as hydrocarbon reacts with the oxygen molecule to produce water and carbon dioxide.

Therefore, [tex]\rm Al_{2}S_{3} \rightarrow2Al + 3S[/tex] is the single-displacement reaction.

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Answer:

D.) Frying a hamburger

Explanation:

A, B, and C are all physical changes whereas D is a change that alters its chemical makeup.

Answer:

You need to add the options to this question.

Explanation:

The observation, in this case, is quantitative.

Quantitative observations are observations that can be recorded based on quantitative data. In other words, they are observations that can be assigned numerical values.

Quantitative observations are as opposed to qualitative observations because the former cannot be assigned numerical values. They can be ranked or qualified.

In this case, Danielle and Heather could assign numbers to the length, width, and height of the tank in order to calculate its volume.

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Domains are larger than kingdoms and include more organisms as far as the classification of living organisms is concerned.

Domains

When it comes to classifying living organisms, the highest level of classification is the domain. Under each domain is where we have the kingdoms.

For example, the domain eukarya contain four kingdoms; plant, animal, fungi, and protozoa.

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Answer:

The Answer is B

Explanation:

Domains are larger than kingdoms :) Your welcome

Answer:

metals are those element that have luster,malleable, ductile good conductors of heat and électricity, must have high melting and boiling points, and lose electrons in chemical reactions.

Answer:

B. po ang sagot

Explanation:

Answer:

the amount of energy stored in bonds

Explanation:

potential energy is stored energy and chemical just refers to energy stored in chemical bonds

i took the quiz

The term describes chemical potential energy is  the amount of energy stored in chemical bonds. Hence, option C is correct.

Chemical potential energy is the energy held inside a substance's chemical bonds. When gasoline is burnt in a regulated manner in the car's engine, a significant quantity of chemical potential energy that is present in the many compounds that make up gasoline is released.

When that energy is released, two things happen: part of the potential energy is converted into work, which is used to drive the automobile, and some of it is also converted to heat, which heats up the engine of the car. A system's energy changes take the form of heat, work, or a mix of the two.

Therefore, option A is correct.

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Answer:

Polar

Explanation:

Answer:

the flask feels warm

Explanation:

in exothermic reaction heat is leaving the system and entering the surroundings aka the flask

also i took the quiz

Answer:

Answer:

12. 5

11.

10

10

15. 7

14. 11

2

=

16

16

18. 3

+

11

17

3

4

co

loo

8

Step-by-step explanation:

12. 5

11.

10

10

15. 7

14. 11

Answer:90°

Explanation:

The two triangles are located on the points as shown in the image. To place the tringle ABC on the top of the triangle DEF , we have to move ABC one 45° rotation.

The three sides of a tringle can be represented using the coordinate axes and the sides as well the diagonals are easily indicated using the coordinate values. The rotation of triangles can be represented using coordinate axes to identify the correct angle of rotation.

Here, one complete rotational cycle through the 4 axes is 360°  rotation. One half that from the positive side to the negative axis is 180° . Then, from x to y it is 90° .

The triangle ABC can be placed on the top of triangle DEF by rotating 45° . Since 90°  rotation will make the triangle ABC to cut the x- axis line we need to make half rotation only.

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Answer:

microbiology

Explanation:

The number of formula units of Na₂SO₄ present in the sample is 3.01×10²³ units

From Avogadro's hypothesis,

1 mole of Na₂SO₄ = 6.02×10²³ units

But

1 mole of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g

Thus,

142 g of Na₂SO₄ = 6.02×10²³ units

142 g of Na₂SO₄ = 6.02×10²³ units

Therefore,

71 g of Na₂SO₄ = (71 × 6.02×10²³) / 142

71 g of Na₂SO₄ = 3.01×10²³ units

Thus, 3.01×10²³ units of Na₂SO₄ is present in the sample

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