Which of the following are functions of an animal's movement structures like wings, legs, or fins? Select the two correct answers.
protection from elements
keeping out bacteria and viruses
migrating to mating spots
identifying food
escaping from predators
Answer:
Protection from elements and Identifying food
Explanation:
For example by use of legs animals can move from one place to another to find food.
Wings usually act as Protection objects in birds
what is the principal ore of calcium
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.
The unequal sharing of electrons between the oxygen and hydrogen atoms within a water molecule makes water a ____________ molecule.
Answer:
Polar
Explanation:
If the nucleolus were not able to carry out its function, what other cellular organelles would be affected?.
Answer: Ribosomes and the rough endoplasmic reticulum
Explanation: This is because the nucleolus functions to facilitate ribosome biogenesis. So without ribosomal synthesis, ribosomes could not produce and the endoplasmic reticulum wouldn't be able to produce proteins.
A researcher can determine that an exothermic reaction has occurred in a flask if …
A) the flask feels cool.
B) minimal particle movement is visible.
C) lots of particle movement is visible.
D) the flask feels warm.
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
I need help with this question please someone tell me the answer for this
What is the relationship between intermolecular forces and speed of evaporation?
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
Chemical Reactions/Neutralization Reactions
Predict the products of the following neutralization reactions by completing the word equations. Then write a balanced chemical equation for each reaction.
1. Hydrobromic acid + Sodium hydroxide
2. Phosphoric acid + Potassium hydroxide
3. Iodic acid + Ammonium hydroxide
4. Hydrophosphoric acid + Calcium hydroxide
5. Sulfurous acid + lithium hydroxide
6. Hypofluorous acid + barium hydroxide
7. Nitric acid + beryllium hydroxide
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
Which of the following is an example of a chemical change?
A evaporating of milk
B bending a pop can
C burning paper
D melting wax
Answer:
burning a paper is chemical change
In eukaryotic cells, mRNA is produced in the....
A. cell membrane
B. endoplasmic reticulum
C. Golgi body
D. nucleus
How many grams of KCI could be produced from 3.2 mol of KCIO3
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
What is the percent composition by mass of oxygen in magnesium oxide.
Answer
Explanation:
Magnesium Oxide has a formula of MgO.
Magnesium has a molar mass of 24.30g/mol and Oxygen has a molar mass of 15.99g/mol.
From this, we can say we are assuming a 1 mole sample of magnesium oxide, as the stoichiometric coefficients will always be the same, as will the ratio of oxygen to magnesium.
From this,
[tex]15.99g/mol *1 mol MgO = 15.99 gOxygen\\24.30g/mol *1molMgO=24.30gMagnesium\\Oxygen mass percent = 15.99/(15.99+24.30) = .396[/tex]
The Magnesium equation will be the same but a different numerator. Notice, if there were different coefficients on the elements, you would have to multiply by the stoich coefficient.
An example of a chemical change is
A dew disappearing from the grass
B mashing potatoes
C a magnet sticking to the refrigerator
D frying a hamburger
Answer:
D.) Frying a hamburger
Explanation:
A, B, and C are all physical changes whereas D is a change that alters its chemical makeup.
Emission Vehicle Program Should automobile makers be made to adhere to quotas zero - emission vehicles set by states , even if the causes automakers to lose revenue ?
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
What are Zero-Emission vehicles?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.
Learn more about zero-Emission Vehicles, here:
brainly.com/question/24603233
#SPJ5
Choose the value for rotation to place triangle ABC on top of triangle DEF. How can you complete the transformation in only one move? one 45° rotation one 90° rotation one 180° rotation one 200° rotation.
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.
What is triangle coordinates?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.
Find more on triangle rotation:
https://brainly.com/question/27949069
#SPJ6
true or false a neutral atom must have the same number of neutrons and protons
How is Carbon returned to the atmosphere? Choose 3
Answer:
Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms. ... Humans play a major role in the carbon cycle through activities such as the burning of fossil fuels or land development
Answer:
2, 3, 4 or the last 3 except the first
Explanation:
Hope that helps!
Which of these statements are true? Select all that apply. The Delta. Hrxn for the reaction C(s) O2(g) Right arrow. CO2(g) is the same as the Delta. Hf for CO2(g). The Delta. Hrxn for the reaction Na(s) Cl2(g) Right arrow. 2NaCl(s) is the same as the Delta. Hf for NaCl(s). The Delta. Hf for Br2(l) is 0 kJ/mol by definition. To determine the Delta. Hf for H2O(g), just reverse the sign of the Delta. Hrxn for the reaction 2H2O(l) Right arrow. 2H2(g) O2(g). The Delta. Hf for N2(l) is 0 kJ/mol by definition. The Delta. Hrxn for the reaction 1. 5H2(g) 0. 5N2(g) Right arrow. NH3(g) is the same as the Delta. Hf for NH3(g).
Based on the enthalpy changes, the true statements are:
ΔHrxn for the reaction C(s) + O2(g) -----> CO2(g) is the same as the ΔHf for CO2(g)ΔHf for Br2(l) is 0 kJ/mol by definition.ΔHrxn for the reaction 1. 5H2(g) + 0. 5N2(g) ---> NH3(g) is the same as the ΔHf for NH3(g)Enthalpy changesEnthalpy changes are the heat changes that occurs during a chemical reaction.
Based on enthalpy changes the following statements from the given options are true:
ΔHrxn for the reaction C(s) + O2(g) -----> CO2(g) is the same as the ΔHf for CO2(g) since the reaction produces CO2 ΔHf for Br2(l) is 0 kJ/mol by definition.ΔHrxn for the reaction 1. 5H2(g) + 0. 5N2(g) ---> NH3(g) is the same as the ΔHf for NH3(g) since the product of the first reaction is the same as reaction 2.Therefore, based on the enthalpy changes, the true statements are:
ΔHrxn for the reaction C(s) + O2(g) -----> CO2(g) is the same as the ΔHf for CO2(g)ΔHf for Br2(l) is 0 kJ/mol by definition.ΔHrxn for the reaction 1. 5H2(g) + 0. 5N2(g) ---> NH3(g) is the same as the ΔHf for NH3(g)Learn more about about enthalpy changes at: https://brainly.com/question/14291557
What is a disadvantage of a series circuit?
A. Electricity can flow through the circuit.
B. If one light goes out, the rest go out.
C. It contains a battery.
D. It uses the least amount of wire.
A chemist obtains a sample of
sodium sulfate, Na2SO4, with a mass of 71.0 g. How many formula units of sodium sulfate are in the sample?
The number of formula units of Na₂SO₄ present in the sample is 3.01×10²³ units
Avogadro's hypothesisFrom 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
How to determine the units in 71 g of sample142 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
Learn more about Avogadro's number:
https://brainly.com/question/26141731
What is the empirical formula for a compound that is 24.7 % calcium, 1.20 % hydrogen, 14.8 % carbon, and 59.3 % oxygen? *
Answer:
[tex] C_2H_2O_6Ca [/tex]
Explanation:
Here we are given that the percentage of ,
Calcium = 24.7% Hydrogen = 1.20%Carbon = 14.8% Oxygen = 59.3%And we need to find out the Empirical formula of the compound .
Firstly divide the given percentage by the atomic mass of the compound . Here this is followed in the fourth column of the table , which will give the relative number of atoms .Secondly , divide the value obtained by the smallest value among them .Say if we got the relative number of atoms as 4 , 3 and 2 , then divide all three numbers by 2 . ( followed in 5th column below .)Finally write the Empirical formula of the compound by writing the ratio obtained as the subscript of respective compounds .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.
What is empirical formula?
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.
Learn more about empirical formula here: https://brainly.com/question/1603500
please help, I’m a bit confused, lol
Explanation:
option A skeleton system is correct option
hope this helps you !
The temperature at which a liquid becomes a gas is the ____ point.
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
Help please!
Read the scenario and decide whether the observations are qualitative and/or quantitative.
Danielle and Heather were in science class when they volunteered to fill the fish tank in the back of the room using a long hose connected to the sink. Mr. Ferris told them to fill the tank almost to the top and to be sure not to overflow the tank. The girls wanted to know how much water the tank could hold, so they recorded the length, width and height of the tank in centimeters. Next, they determined the total volume of the tank using the formula, length x width x height.
The observation, in this case, is quantitative.
Quantitative observationQuantitative 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.
More on quantitative observations can be found here: https://brainly.com/question/17491501
Why do you need a correct lewis structure before you can use vsepr to predict a molecules geometry.
Answer:
so the answer that you get isn't wrong? i dont know
These are elements 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:
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.
A student is interested in resource recovery through composting. Which field
of study would be most useful?
A. Botany
B. Microbiology
C. Geophysics
D. Oceanography
SUBMIT
Help pls
Answer:
microbiology
Explanation:
3. A teacher prepared 0.125 M sodium chloride stock solution. What volume of the stock solution is
required to prepare a dilution of 0.05 M in 100 ml?
CORO
NOSWVS
a. 100 ml
b. 60 ml
C. 40 ml
d. 20 ml
Answer:
B. po ang sagot
Explanation:
How much energy is needed to change the temperature of 50. 0g of water by 15. 0 degrees celcius?.
I need help with this question, I don't get it!
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)
