Answer:
The "word equation" is Magnesium + Dioxygen → Magnesium Oxide
Explanation: This is also the same as Mg + O₂ → MgO.
A box has dimensions of 2.5 cm by 3.0 cm by 4.0 cm. The volume of the box in milliliters and liters is Group of answer choices 3,000 mL and 3.0 L 30 mL and 30,000 L 7.5 mL and 7,500 L 30 mL and 0.030 L 7.5 mL and 0.0075 L
Considering the definition of volume, the volume of the box is 30 mL or 0.03 L.
What is volumeVolume is a metric magnitude that is defined as the extension in three dimensions of a region of space. In other words, it is defined as the amount of space occupied by the object or figure in three-dimensional space. Volume is measured in cubic units.
Volume can be considered as the capacity of a container to hold a quantity of fluid (gas or liquid).
Volume of a boxA box is a rectangular prism, which is defined as a prism with rectangular bases and rectangular lateral faces.
The volume of this prism depends on its three dimensions and is calculated as the multiplication of these dimensions:
Volume= Dimension 1× Dimension 2× Dimension 3
Volume of the box in this caseIn this case, you know that a box has dimensions of 2.5 cm by 3.0 cm by 4.0 cm. So, the volume can be calculated as:
Volume= 2.5 cm× 3 cm× 4 cm
Solving:
Volume= 30 cm³
Being 1 cm³= 1 mL and 1 L= 1,000 mL then:
Volume= 30 cm³= 30 mL= 0.03 L
Finally, the volume of the box is 30 mL or 0.03 L.
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Question 3 of 25
Which statement describes a question that can guide the design of a
scientific investigation?
OA. It asks about whether a controlled variable is necessary.
B. It asks about the preferred outcome of the investigation.
C. It asks about how the observations will be organized.
D. It asks about a cause-and-effect relationship between two
variables.
The statement that describes a question that can guide the design of a scientific investigation could be about the necessity of a controlled variable. The correct answer is A.
What is a controlled variable?It is a variable whose values are controlled by the researcher during the course of experimental investigations.
When designing an experiment, it is necessary to identify the different variables that would be involved for a successful investigation.
Variables can be independent, dependent, controlled, or constant. Identifying the necessary variables will help in designing the experiment.
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which are not oxidative reaction?
(look at the image)
Answer:
Cu²+ e ----> Cu+This is not oxidation as it gain electron .
Oxidation reaction means addition of oxygen or removal of hydrogen
or in other words loss of electrons
Mg ----> Mg²+ + 2e
this is oxidation reaction as Mg loss 2e to become +2
Sn³+ -----> Sn4+ + 2e
this is oxidation reaction as it losses electrons
similarly other are also oxidation.
On a heating curve, in which section(s) would you use the equation, Q=mCΔT, to calculate the total heat required?
only on plateaus or flat parts of the curve
on a sloped part only if under 0oC
on a sloped part only if over 100oC
on all sloped parts of the curve
Answer:
all sloped parts
Explanation:
Sloped part of the curve - all as this would show a change in T ( or delta T)
the flat parts would involve no change in Temp
What type of bond is formed between the following elements/molecules (ionic, polar covalent, or nonpolar covalent)?
Answer:
1.) Ionic
2.) Nonpolar Covalent
3.) Polar Covalent
Explanation:
Ionic bonding generally occurs when a metal and nonmetal wish to donate/receive electrons from each other. These bonds are between two atoms with a large electronegativity difference. In the first diagram, potassium (K) is a metal and chlorine (Cl) is a nonmetal. As you can see, after the reaction, potassium donates an electron to chlorine.
Nonpolar covalent bonding occur when atoms of practically the same electronegativity combine. As such, atoms of the same nature have a zero electronegativity difference and thus always form these bonds.
Polar covalent bonding generally occurs between two nonmetals. These atoms have an intermediate size electronegativity difference. Carbon (C) and chlorine satisfy this rule.
What is the chsrge of am atom with an equal number of protons and electrons
Answer:
0
Explanation:
they cancel each other out (ex: 1 positive and 1 negative cancels, making it neutral or a charge of 0)
state three differences between temporary and permanent changes
Answer:
temporary changes are the changes which are there only for a short period if time generally temporary changes are reversible permanent changes are the changes which remain to for longer time and are not reversible
Explanation:
hope it is helpful for
2.3 moles of CaBr2 contains how many molecules
Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] molecules.
This means that in 2.3 moles, there are [tex]2.3(6.022 \times 10^{23})=\boxed{1.4 \times 10^{24} \text{ (to 2 sf)}}[/tex]
What is Mg ^-2 and SO4^-2=
MgSo4 will be formed
Discuss the importance of chemical reaction in our daily life?
Answer:
By observing chemical reactions, we are able to understand and explain how the natural world works. Chemical reactions turn food into fuel for your body, make fireworks explode, cause food to change when it is cooked, make soap remove grime, and much more.
hope it helps you
A cup of hot water loses 265 cal
of energy to its surroundings.
How many joules of energy is
this?
[?] joules
Answer:
-1071 Joules
Explanation:
The Joule was introduced as the SI unit for energy in 1925. One calorie is equal to approximately 4.184 joules(J). This is a conversion factor that we can write two ways:
(1cal/4.184J) or (4.184J/1cal)
(265 cal)*(4.184J/1cal) = 1071 J
Since the energy is leaving the system, it should be written with a minus sign: -1071J
Answer:
1,108.76 joules
Explanation:
There are 4.184 joules per calorie
4.184 x 265 = 1,108.76
First twenty element with electronic configuration
Explain light as the condition required for chemical change with few examples.
Suppose you add a cup of sugar to hot water and all of the sugar dissolves. then the water cools and some of the sugar is seen as a solid on the bottom of the beaker. explain why this happened.
Answer:
its becuz the water is not capable to disolve all the salt it has limits and ones it reaches its limit it wont have the ability to disolve any salt
Which is the correctly balanced chemical equation for the reaction of KOH and H₂SO4?
OKOH H₂SO4 →K*+50²-
2KOH+H₂SO4 → K₂SO4
2KOH+H₂SO4 → K₂SO4+2H₂O
4
OKOH H₂SO4 → K₂SO4 →H₂O
Answer:
2KOH + H2SO4 > K2SO4 + 2H2O
Explanation:
firstly the order speaks, you can't have something like OKOH so the other two is eliminated. Then check if the remaining reactions balance
The correctly balanced chemical equation for the reaction of KOH and H₂SO₄ is 2 KOH+H₂SO₄ → K₂SO₄+2 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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20) Mg + O2 → MgO
Reaction Type
synthesis (s)
decomposition (D)
single replacement (SR)
double replacement (DR) or combustion (C)
The given reaction Mg + O₂ → MgO is a type of Synthesis reaction. Hence option (1) is correct.
What is Synthesis reaction ?Synthesis reactions are reactions that occur when two different atoms or molecules interact to form one molecule or compound.
It is also known as combination reaction
In the given reaction Mg and O combines with each other to form one product i.e, MgO. Hence, The given reaction Mg + O₂ → MgO is a type of Synthesis reaction. Thus, option (1) is correct.
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How do H3O+ and OH relate to acids, bases and the pH scale?
Answer: An acid is defined with having more [H₃O+] ions, and a base is defined with having more [OH-] ions. On the pH scale, an acid has a lower pH and a base has a higher pH. With this being said, the lower the pH, the more [H₃O+] ions are present and the higher the pH, the more [OH-] ions are present.
Explanation:
I hope this helps!! Pls give brainliest!! :)
Discuss how varying ph of water affects the soil ph which in turn would affect the durability properties of reinforced concrete as a constituent material?
Although soils are capable of resisting pH changes, there are some circumstances where the pH of the water can result in alterations.
Will Soil pH Be Affected by Water pH?The texture of soil affects how susceptible it is to the pH of the surrounding water. Smaller soil particles, such as clays and clay loams, have a greater impact than larger, sandier soils. There are more colloids, which are extremely minute particles, in fine-textured soils. Positively charged ions are maintained at these colloids. The cation exchange capacity of a soil refers to its capacity to hold onto these ions. Ions on the colloidal particles trade places with ions in the soil solution. The pH of the soil is less affected by negative ions in the soil solution.
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According to the concept of entropy, what will likely happen to most molecules over time?.
They're going to fall apart.
What most molecules will likely experience over time?A system's entropy cannot decrease unless heat is being lost from it. This indicates that entropy cannot decrease in a closed system (i.e., nothing enters or leaves, and that means nothing at all), so it must either remain constant or rise. Entropy can decrease, rise, or stay constant in an open system when movement between the system and its surroundings is conceivable. Both of these outcomes leave open the option of a constant state.
Entropy:-
The quantity of atom-alignment combinations that can exist in a system is known as entropy. The quantity of energy that cannot be used for work can also be calculated from an object's entropy.
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Justify that the shielding effect of an atom remain constant in a period but atomic size gradually gets smaller (chemistry)
Atomic size decreases across a period because but the positive charge of the nucleus gets increases across a period.
What is the shielding effect?The shielding effect is the shielding from the pulling force of the positively-charged nucleus given to. the outermost shell electrons by the inner electrons.
Since the shielding effect remains constant across a group but the positive charge of the nucleus gets bigger, atomic size decreases across a period.
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can a chemical reaction take place without enzyme
Answer:
Theoretically, Yes (See the explanation)
Explanation:
The body has enzymes that catalyze processes, as several other respondents have mentioned. I haven't noticed any comments, but the reverse impact might be just as significant. Some enzymes are reaction inhibitors. Others operate as both catalysts and inhibitors, depending on the amounts of the reactants and reaction products close to the catalyst. I'll provide an illustration to demonstrate how crucial inhibition may be. Let's say you consume three banana splits one after the other. That is a large number of calories. You would have a very high temperature and be so energetic and full of energy that you would be bouncing off the walls if all those calories were converted simultaneously into energy and heat. But neither you nor I have ever heard of overeating creating a high temperature or anxiety. This is due to the fact that many of the high energy molecules produced by the process hinder the enzymes that regulate metabolism, which produces the energy needed to power your body and generate heat. In other words, if you don't require high energy, your body won't keep making it. When there are huge amounts of carbohydrates around, the enzymes that turn the carbohydrates you consumed into glycogen and fat (to store the extra energy you don't need right now) become catalytic (mostly glucose). Therefore, the /majority of the energy from those three banana splits will be stored as fat and glycogen as it won't be needed. And that occurs as a result of the reaction to turn the sugars into energy being blocked by the lack of a demand for the energy at the time. Both enzymes that act as catalysts and those that act as inhibitors are essential to the healthy operation of our bodies.
________________________________________________________
Definitions:
Enzymes: Any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion.
Metabolism: The sum of physical and chemical processes in an organism by which its material substance is produced, maintained, and destroyed, and by which energy is made available.
Glucose: A sugar, C6H12O6, having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits , animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotary form (lavoglucose, or -glucose) not naturally occurring.
Chemical reaction: Reaction, the reciprocal action of chemical agents upon each other; chemical change.
Protein: Any of numerous, highly varied organic molecules constituting a large portion of the mass of every life form and necessary in the diet of all animals and other nonphotosynthesizing organisms, composed of 20 or more amino acids linked in a genetically controlled linear sequence into one or more long polypeptide chains, the final shape and other properties of each protein being determined by the side chains of the amino acids and there chemical attachments: proteins include such specialized forms as collagen for supportive tissue, hemoglobin for transport, antibodies for immune defense, and enzymes for metabolism.
Amino acids: Any of a class of organic compounds that contains at least one amino group, -NH2, and one carboxyl, -COOH: the alpha-amino acids, RCH(NH2)COOH, are the building blocks from which proteins are constructed.
Answer:
Chemical reactions would slow down and even not proceed at all without enzymes.
Explanation:
Enzymes are protein catalysts, meaning they speed up chemical...
HELP FAST PLEASE! If a reaction takes place and the theoretical yield is 73 g and the actual yield is 62 g, calculate the percent yield.
Choices:
A. 76%
B. 1.16%
C. 116%
D. 85%
Answer:
A
Explanation:
I think it's A. There are good answer for A.
Give the formula of the compound formed from the following sets of elements,
- Calcium and Fluorine
- Hydrogen and Sulfur
- Nitrogen and Hydrogen
- Carbon and Chlorine
- Sodium and Oxygen
[tex]1) \text{ } \text{CaF}_{2}\\\\2) \text{ } \text{H}_{2}\text{S}\\\\3) \text{ } \text{NH}_{3}\\\\4) \text{ } \text{CCl}_{4}\\\\5) \text{ } \text{Na}_{2}\text{O}[/tex]
What type of molecule is shown below
Answer:
alcohol
Explanation:
alcohol thus, C2H5OH
In an endothermic reaction products are _____ in potential energy and _____ stable than reactants.
higher; more
lower; more
higher; less
lower; more
In an endothermic reaction, products are higher in potential energy and less stable than reactants.
What is an endothermic reaction?Endothermic reactions are those reactions that do not release heat but absorb heats, that's why the products are of higher potential energy and due to this they are less stable.
Thus, the correct option is C, higher; less.
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What are some possible bias in an experiment about how sleep affects mood
HELP ASAPPPPP
Answer: Some possible bias in an experiment about how sleep affects mood could be a person's average mood with or without sleep, how people are acting in the experiment compared to how they actually would in their normal environment, or even how the person collected the data for the experiment interprets their moods.
Explanation:
1. A person's mood could be relatively different depending on other factors than just sleep, so it could affect experiment. For example if an emotional crisis had occurred recently, it could affect your mood and environmental factors could affected your mood, like weather.
2. A person could also change their mood around strangers or even when participating in the experiment. For instance if they aren't comfortable with the person taking down the analysist or the other test subjects, they make act differently than they usually do at home where they're comfortable.
3. A person collecting the data will have to know how to specify and determine a persons mood with their instruments. For example, if they're doing it just by talking with the test subjects, they'll have to know how to properly understand their different stages of each of their moods with out the data collectors mood changing as well. Also, if the data collectors mood is changed at all it can slightly affect the experiments results as well.
plssssssssssssssssssssss helppppppppppppppppppppppppppppppppppppp
Answer:
protons and neutrons have different charges but they have approximately the same mass
3
Which statement describes the law of conservation of energy?
O All systems will exchange matter and energy with their surroundings.
O All systems can exchange energy, but not matter, with their surroundings.
Energy cannot be created nor destroyed, but it changes from one form to another.
O Energy is destroyed in most chemical reactions when new products are formed.
Energy cannot be created nor destroyed, but it changes from one form to another. Hence, option C is correct.
What is energy?Energy is the ability to do work.
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.
Hence, option C is correct.
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If 2 moles of water decomposes, the products that will form are 2 moles of hydrogen gas and one mole of oxygen gas. If a reaction is conducted that consumes 20.0 mL of water, what volume of oxygen gas will be produced
Answer:
Explanation:
The balanced equation for the decomposition of water is:
2H2O = 2H2 + 1O2
This tells us that we should expect 1 mole of O2 for every 2 moles of H2O, a molar ratio of (1 O2/2 H2O).
If we start with 2 moles of water, we should get (2mole H2O)*(1 O2/2 H2O) = 1 mole of H2.
But we are given just 20ml of water by the stingy boss. We need to calculate the number of moles of water in that 20 ml. We'll assume pure water at room temperature, so density = 1g/ml. We have 20 g of H2O. To find moles, divide by water's molar mass of 18 g/mole:
20g/(18g/mole) = 1.11 moles H2O
The moles of H2 produced would be:
(1.11 moles H2O)*(1 O2/2 H2O) = 0.55 moles O2 produced
We are not given the conditions of temperature and pressure, so the only way the calculate a volume of gas occupied by 1 mole of oxygen is to assume standard temperature and pressure (STP). At STP 1 mole of gas occupies 22.4 liters.
1 mole of O2 will be 22.4 liters.
0.55 moles of O2 would be:
(0.55 mole O2)*(22.4 liters) = 12.32 liters
identify the reaction type predict the products and the balance in each of the following equations a. ___K3PO4 + ___ MgCl2 --> b. ___Fe + ___Na2CO3 --> c. ___CH4 + ___O2 --> d. ___H2 + ___Cl2 -->
a. 2K₃PO₄ + 3MgCl₂ ----> Mg₃(PO₄)₂ + 6KCl
This is a double displacement reactionPotassium displaces Magnesium from magnesium chlorideMagnesium displaces potassium from potassium phosphateb. Fe + Na₂CO₃ -----> FeCO₃ + 2Na
This is a redox reactionIron undergoes oxidation, iron is oxidised to ferrous carbonateSodium undergoes reduction, sodium is reduced from sodium carbonate to sodium metalc. CH₄ + 2O₂ ------> CO₂ + 2H₂O
This is a combustion reactionMethane undergoes combustion in the presence of oxygen to produce carbon dioxide and waterd. H₂ + Cl₂ -------> 2HCl
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