Can someone help me with this problem.

Can Someone Help Me With This Problem.

Answers

Answer 1

Answer:

c. a small amount

Explanation:

Trace elements (or trace metals) are minerals present in living tissues in small amounts.


Related Questions

Balance this reaction.
__CO +__ H₂ —> __CH3OH

options for blanks: (blank,2,3,4)

Answers

Answer:

1CO + 2H₂ —> 1CH3OH

Explanation:

When balancing any chemical equation given, you identify the amount of reactants and amount of products.

From our given equation;

__CO +__ H₂ —> __CH3OH

Reactants

C = 1

O = 1

H = 2

Products

C = 1

O = 1

H = 3 + 1 = 4

This shows that Hydrogen is not balanced we require 2 to balance it. Thus giving us;

1CO + 2H₂ —> 1CH3OH,

Which is balanced.

Explain the impact that changing concentrations has on a system in a state of dynamic equilibrium. What will happen when reactants are added to a reversible reaction mixture at equilibrium?

Answers

if pressure is increased, equilibrium will shift toward the side that has the last amount of moles in order to alleviate the sudden change and bring the pressure back down.

Question 15 of 35

A bog formed where there was once a pond.

Which three statements describe how the pond turned into the bog?

A. The pond started to fill with soil, but the soil could still hold
standing water.

O B. Large water plants grew in shallow water around the edge of the
pond.

O C. Land plants grew on dry soil that had completely filled the pond

Please explain

Answers

The statements that describe how the pond turned into the bog is as follows: Large water plants grew in shallow water around the edge of the pond.

What is a pond?

Pond is an inland body of standing water, either natural or man-made, that is smaller than a lake.

A bog is an area of decayed vegetation (particularly sphagnum moss) which forms a wet spongy ground too soft for walking.

This means that a pond can become a bog when existing plants in the pond decays until the land becomes soft.

Therefore, the statements that describe how the pond turned into the bog is as follows: Large water plants grew in shallow water around the edge of the pond.

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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: ca2 , cr4 , cl−, s2−

Answers

The empirical formula of at least four binary ionic compounds that could be formed from the calcium, chromium, chloride and sulfide ions are CaCl₂, CrCl₄, NaCl and CaS respectively.

What are binary ionic compounds?

If any compound which is composed of two different elements, one of which is a positive ion (metal), and the other is negative ion (non-metal) is called binary ionic compounds.

Binary ionic compound of Ca²⁺ is CaCl₂.Binary ionic compound of Cr⁴⁺ is CrCl₄.Binary ionic compound of Cl⁻ is NaCl.Binary ionic compound of S²⁻ is CaS.

Hence, CaCl₂, CrCl₄, NaCl and CaS are the four binary ionic compounds.

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Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu.

A solid
has
a definite volume and
has
a definite shape.
A liquid
has
a definite volume and
does not have
a definite shape.
A gas
has
a definite volume and
does not have
a definite shape.

Answers

Answer:

Explanation:

Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu.

Answer:

I got it right

Explanation:

A sample of carbon dioxide gas occupies a volume of 2.50 l at 140 kpa. what pressure would the gas exert if the volume was decreased to 1.25 l?

Answers

Answer:

280 kPa

Explanation:

P1V1 = P2V2

140 * 2.5 =  P2 * 1.25

P2 = 280 kPa

8. A sample of CO2 experiences a change in pressure from 239.18 kPa to 442.6 kPa. During
this change, the temperature is also changed from 267.86 K to 399.29 *C. If its new volume is
7680.5 mL, what was its original volume in liters?

Answers

Answer:

v1=35,679.7 ml

Explanation:

p1v1/t1=p2v2/t2

v1=t1p2v2/p1t2

v1=672.44*442.6*7650ml/267.86*239.18

v1=35,679.7 ml

What is defined as the energy required to start a chemical reaction?
O precipitate energy
O reactant energy
O activation energy
O heat

Answers

★Hi Mate★

[tex]\huge\tt\fbox\pink{Activation \: energy}[/tex]

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Elements in Group IIA (also known as Group 2, or the alkaline earth metals) have similar properties because they all have the same number of ____

(multiple choice)

A. valence electrons
B. electrons
C. electrons needed to fill their octet
D. electron shells​

Answers

Answer:

Electrons in their outer shell

Explanation:

They have similar properties they have the same number of electrons in their outermost shell.

Why do rocks on the ocean floor form a pattern of magnetized stripes? hurry hurry pls pls pls HURRY

Answers

Answer:

BEST ANSWER :

The rocks contain iron that points in the direction the rocks move away from the ridge.

Which of the following is not true about elements? 1. Elements are made of atoms of the same type. 2. Each element has a unique set of physical and chemical properties. 3. Elements cannot be broken down into a simpler set of properties. 4 Elements are the building block of matter.

Answers

Sorry If This Is Late***

Elements can't be broken down, into a simplre set of properties. They are one strict unit & cannot be broken down, however they can be added together to make a compound.

HOPE THIS HELPS & good luck <3 !!!!!

If the specific heat of a material is 0.416 J/(g°C) and sample absorbs 50 J when it is heated from 30°C to 50°C what is the mass of the sample?

Answers

The mass of the sample of the material is 0.1664 g.

What is specific heat?

The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.

By the formula of specific heat

[tex]Q = mc \Delta T[/tex]

Given, that the specific heat (c) of material is 0.416 J/gC

The difference in temperatures is 30°C to 50°C

The mass=?

Q = heat, 50 J

Putting the values in the equation

[tex]\rm 50\;J = m \times 0.416 J/g^\circ C \times (50 - 30)\\\\m = \dfrac{0.416 J/g^\circ C \times 20}{50} = 0.1664 g[/tex]

Thus, the mass of the samples is 0.166 g.

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Mg(s) + 2 HCl (aq) _MGCL2 (Aq) + H2 (g) the total pressure of gas collected over water is 740.0 mmhg and the temperature is 21.5 ‘c what is the pressures of hydrogen gas formed in mmhg?

Answers

The pressure of hydrogen gas formed  is 720.8 mmHg.

What is Partial Pressure ?

The pressure exerted by a (specified) component in a mixture of gases.

We have to understand one thing that the Hydrogen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components.

the partial pressure of Hydrogenthe vapor pressure of water at 21.5 C

The vapor pressure of water at that temperature is approximately

19.231 mmHg.

This means that

[tex]\rm P_{total} = P_{hydrogen} + \; P_{water vapor}[/tex]

740 = [tex]\rm P_{hydrogen}[/tex] + 19.231

[tex]\rm P_{hydrogen}[/tex] = 740-19.231

[tex]\rm P_{hydrogen}[/tex] = 720.8 mmHg

Therefore the pressure of hydrogen gas formed  is 720.8 mmHg.

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Rank these solutions from the most alkaline (1) to the least alkaline (5). POH = 0. 5 pH = 3. 5 [OH–] = 5. 62 × 10–5 M [H3O ] = 3. 16 × 10–7 M pH = 0. 5.

Answers

Answer:

1 4 2 3 5 from top to bottom

Explanation:

1 - pOH = 0.5

4- pH = 3.5

2- [OH–] = 5.62 × 10–5 M

3-  [H3O+] = 3.16 × 10–7 M

5- pH = 0.5

What do blizzards consist of? (Select all that apply)

Question 1 options:

heavy snowfall


high winds


hail


extremely low temperatures

Answers

Answer:

Heavy Snowfall

High Winds

Extremely Low Temperatures

Reasoning:

Lots of snow, kinda self explanatory

high winds are needed to carry the snow that fast

its has to be below freezing for snow to even form

Lab: Half-Life Claim, Evidence, Reasoning: Lab Prompt Write 3 total sentences establishing your claim, giving your evidence from the lab, and giving your reasoning. Using the data collected from your lab, and the objective questions, create a CLAIM: based on evidence collected in the lab EVIDENCE: Pulled directly from the lab REASONING: Based on principles, rules, universal laws, definitions.

Answers

The question is not found here but the results of a lab experiment can be used to draw discussions and conclusions.

What is an experimental procedure?

An experimental procedure in the lab refers to the process to validate (or reject) our working hypothesis from a given question of the natural world.

Within the laboratory, we need to collect data through experimental procedures that help us as evidence to answer the hypothesis.

In conclusion, the question is not found but the results of a lab experiment can be used to draw discussions and conclusions.

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What is the initial temperature of a gas if the volume changed from 1. 00 l to 1. 10 l and the final temperature was determined to be 255. 0°c?

Answers

Answer:

206.99 C

Explanation:

V1 / T1   = V2 / T2             T must be in K units

V1 * T2/V2 = T1

255 C =   528.15 K

(1)(528.15)/1.1 = T1 = 480.14 K    = 206.99 C

How many moles are equal to 8.44 x 1023 atoms of sulfur?
Round your answer to three decimal places.
Hurry please.

Answers

Answer:moles or atom. The SI base unit for amount of substance is the mole. 1 mole is equal to 6.0221415E+23 atom. Note that rounding errors may occur, so always check the results.

Explanation:

What happens after the digestive system breaks down food?

Answers

If the digestive system breaks down you would have no ability to get the nutrients.

What is the digestive system?

The digestive system includes the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.

If you had no digestive system, you would have no ability to get the nutrients and sugars in food, and you would die.

The digestive system is very long, however. Some people have gotten into car accidents and damaged their intestines, and had to have part of them removed.

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What is the lowest temperature in Kelvin (to the nearest thousandth) that would cause a red blood cell within the human body experience apoptosis?

Answers

The lowest temperature that would cause a red blood cell within the human body experience apoptosis is 338K.

What is aposptosis?

Aposptosis is the death of cells in the am organisms which occur as a result of death in cellular processes or steps resulting in the death of a cells could be as a result of high temperature.

Therefore, The lowest temperature that would cause a red blood cell within the human body experience apoptosis is 338K.

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Please help me with this



Class 7​

Answers

Answer:

a . Organ A is heart liquid B is blood

b. red is the colour of liquid B

c. the useful substance is oxygen and nutrients

d. carbon dioxide is the waste E

Is the chemical equation balanced?

Yes or no

Answers

i think it is not so no

Answer:

Yes the equation is balanced

Explanation:

There is 2Na and 2F on both sides which means LHS=RHS. Hence,its balanced.

how much energy is produced when CO2 is formed if each C-O bond releases 350 kJ?

Answers

Answer:

700 kJ

Explanation:

There are two C-O bonds in CO2

2 * 350 = 700

2 C4H10 + 13 O2--> 8 CO2 + 10 H2O


How many molecules of CO2 are produced from the combustion of 100 grams of butane (C4H10)?

Answers

Answer:

4.14 x 10²⁴ molecules CO₂

Explanation:

2 C₄H₁₀ + 13 O₂ --> 8 CO₂ + 10 H₂O

To find the number of CO₂ molecules, you need to start with 100 grams of butane (C₄H₁₀), convert to moles (using the molar mass), convert to moles of CO₂ (using coefficients from equation), then convert to molecules (using Avagadro's number). The molar mass of C₄H₁₀ is calculated using the quantity of each element (subscript) multiplied by the number on the periodic table. The ratios should be arranged in a way that allows for units to be cancelled.

4(12.011g/mol) + 10(1.008 g/mol) = 58.124 g/mol C₄H₁₀

100 grams C₄H₁₀          1 mol C₄H₁₀             8 mol CO₂          
--------------------------  x  ----------------------  x  ---------------------  
                                        58.124 g              2 mol C₄H₁₀          

    6.022 x 10²³ molecules
x  ------------------------------------  =  4.14 x 10²⁴ molecules CO₂
              1 mol CO₂

In rabbits, short fur (f) is dominant to long fur (1). what is the probability of two heterozygous rabbits having offspring with short fur?
25%
50%
75%
100%

Answers

50%

Because f is dominant to 1, it will be a 50/50 chance of the offspring having short fur, or long fur.

Pls correct me if im wrong

Select the correct answer.
in a grassland, the number of antelopes increased from 200 to 400. Antelopes are grass-eating animals. How will this change directly affect the
ecosystem?
O A. There will be fewer producers in the area.
• B. There will be an increase of other grass-eating animals.
O C. There will be no decomposers in the area.
O D. There will be fewer predators in the area.

Answers

Answer: A. There will be fewer producers in that area.

Explanation: Answer A is correct because all plants, including grass, is a producer. Since there is an increase in grass eating animals (Antelope), more grass will be consumed, decreasing the amount of grass aka producer.

when an acid mixes with a bases it is called a combination reaction?
true
false​

Answers

False it is actually called a neutralization reaction.

What is the molality of the solute in a 25. 5 percent by mass aqueous solution of formic acid (hcooh)?

Answers

Molality is the ratio of the moles of the solute and the mass of the solvent. The molality of the solute is 7.38 m.

What is molality?

Molality is the moles of the solute present in a kilogram of the solvent in a solution of the substance.

Given,

Percent by mass = 25.5 %

In 100 gm of solution = 25.5 gm of  formic acid

Mass of solution = 100 gm

Mass of solute = 25.5 gm

Mass of solvent = 74.5 gm

Moles of solute are calculated as:

[tex]\dfrac{25.5}{46} = 0.55 \;\rm moles[/tex]

Moles of solvent are calculated as:

[tex]\dfrac{74.5}{18} = 4.13\;\rm moles[/tex]

Molality is calculated as:

[tex]\begin{aligned} \rm Molality &= \rm \dfrac{moles}{\text{mass in kg}}\\\\&= \dfrac{0.55}{0.0745}\\\\&= 7.38 \;\rm m\end{aligned}[/tex]

Therefore, 7.38 m is the molality of the solute.

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Help pls chemistry stuff?

Answers

Answer:

saturated is the correct one

Answer: saturated

Explanation:

When a solution contains the maximum amount of solute that can dissolve under a given set of conditions, it is a saturated solution. Any more solute added will sit as crystals on the bottom of the container.

Which is characteristic of an exothermic reaction?
A. Material absorbs heat from its surroundings. B. Molecules in a material become more orderly.
C. Molecules in a material become less orderly. D. Material releases heat to its surroundings.​

Answers

Answer:

D. Material releases heat to its surroundings.​

Explanation:

use the ex in exothermic to remember the word

exit

as in

heat is exiting the material

khan academy

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