25 Which statement best describes how energy can be harmful?
A A fire burns down a house.
B Electricity heats an oven.
C A lamp lights a house.
D An alarm clock wakes up a sleeping person.
26 The diagram below shows four boxes labeled A, B, C, and D. The mass of
each box is shown.
550 A
grams
5
grams
50
grams
700 p
grams
Which box is under the box with a mass of 50 grams?
A box A
B box B
Cbox C
D box D
(OVER)
Grade Science - June 19
20

Answer:

The s stands for the phase of that element or compound. The phase solid is represented by (s). In this problem it is saying solid sodium (Na) is reacting with Bromine (Br) gas to form sodium bromide.

Explanation:

The equilibrium constant (Keq) is given for the reversible reactions. The concentration of hydrogen iodide will be 1.58 M.

The equilibrium constant (Keq) is the proportion of the ratios of the concentration of the products to the reactants.

The balanced chemical reaction is shown as:

2HI  ⇔ H₂ + I₂

The equilibrium expression for the reaction can be given as:

Keq = [H₂] [I₂] / [HI]²

Given,

Equilibrium constant = 1.6 × 10⁻⁴

Concentration of dihydrogen = 2  × 10⁻³ M

Concentration of iodine = 2 × 10⁻³ M

The concentration of hydrogen iodide is calculated as:

1.6 × 10⁻⁴ = [ 2  × 10⁻³ M][2  × 10⁻³ M] ÷ [HI]²

[HI]² = 4  × 10⁻⁶ ÷ 1.6 × 10⁻⁴

= 2.5 M

[HI] = 1.58 M

Therefore, 1.58 M is the concentration of hydrogen iodide.

Learn more about the equilibrium constant here:

https://brainly.com/question/18260565

#SPJ1

Answer:

Hydrogen bonding

Explanation:

Answer:

B

Explanation:

Phosphofructokinase-1

Answer:

341m/s

Explanation:

because speed is given by the product of frequency and wavelength, so mathematically we can write ( v=f×lambda)... so in this case we can say speed=170.5×2= 341m/s

:.speed of the wave= 341m/s

Answer:

410

Explanation:

:)))))))))))))))))))))))))))))))

Answer:

[tex]c = 0.441mol{dm}^{ - 1} [/tex]

Explanation:

[tex]m = 25.22g \\ v = 2.2l = 2.2 {cm}^{3} \\ mm(lif ) = 7 + 19 \\ = 26g {mol}^{ - 1} \\ number \: of \: moles(n) = \frac{m}{mm} \\ = \frac{25.22g}{26g {mol}^{ - 1} } \\ = 0.97mol \\ concetration(c) = \frac{n}{v} \\ = \frac{0.97mol}{2.2 {cm}^{3} } \\ c = 0.441mol {dm}^{ - 3} [/tex]

Answer:

About 300 million years ago, 

Explanation:

Col. Edwin Drake

Answer:

Oil was formed from the animals and plants that lived millions of years ago and the creator is John D Rockefeller and others in 1870

Answer: Chlorine & Bromine

Explanation:

Answer:

2%

Explanation:

.2 g  / 10 g    * 100% = 2%

Molarity, M = (n x 1000) / vol (in ml)

M = 17.2 x 1000/ 2000

M = 8.6 mol/L

Answer:

B) Solvent

Explanation:

The substance being dissolved is called the solute and the liquid doing the dissolving is called the solvent. In order for a substance to dissolve, the molecules of the solute need to interact with the molecules of the solvent.

Answer: Arsenic

Explanation:

Arsenic is in column 15 of the periodic table, which means that it has 5 valence electrons.

Commercial agriculture can often lead to water-quality problems in the following ways:

Water quality refers to the state of a water body that encompasses it's physical, chemical and biological characteristics.

The water quality of a water body is crucial to its suitability for domestic or drinking purpose.

Commercial agriculture greatly affects water quality in the following ways:

Learn more about water quality at: https://brainly.com/question/20848502

#SPJ1

The regression equation supports the hypothesis by showing associations between sets of scientific data (in this case, half life cycle and radioactivity).

The regression equation is a type of mathematical tool employed to determine the association between variables.

The regression equation can help to understand the relationships between independent and dependent variables.

In conclusion, the regression equation supports the hypothesis by showing associations between sets of scientific data.

Learn more about regression analysis here:

https://brainly.com/question/7781679

#SPJ1

Answer:

Quite Strongly

Explanation:

Got it right 2022 edge

98.382 L

This is tricky! But this is my awnswer! :) Hope it helps

Answer:  How much heat is required to convert 29 g of ice at -4.0 ˚C to water vapor at 105 ˚C (report your answer to three significant figures)? Answer all five parts, showing your detailed calculations: i) Heat to warm ice from -4.0 to 0 oC: ii) Heat to convert ice to liquid: iii) Heat to warm liquid to boiling: iv) Heat to convert liquid to gas

Explanation:

e

Answer:

Not sure.

Explanation:

Give me some time.

Answer:

Calcium hydroxide is a white precipitate, too, and it won't dissolve if more sodium hydroxide is added to the solution. No significant precipitate will be formed between calcium ions and ammonia.

Answer:

14500.

Explanation:

1) Avlgadro's number is 6.022*10²³;

2) 1 mol is 6.022*10²³ atoms of Hellium, then 8.7*10²⁷ atoms is

[tex]3) \ \frac{87*10^{26}}{6*10^{23}}=14.5*10^3=14500[moles].[/tex]

Answer:

how was enacting the GI bill Like teaching someone how to fish

The new pressure of the gas that initially have a pressure of 853.0 millibars at a temperature of 29.0 °C is 1011.17 millibars. Details about pressure can be found below.

The pressure of a given gas can be calculated using the following formula:

P1/T1 = P2/T2

Where;

853/302 = P2/358

358 × 853 = 302P2

305374 = 302P2

P2 = 305374 ÷ 302

P2 = 1011.17 millibars

Therefore, the new pressure of the gas that initially have a pressure of 853.0 millibars at a temperature of 29.0 °C is 1011.17 millibars.

Learn more about pressure at: https://brainly.com/question/15175692

#SPJ1

Answer:

c could someone try to do the page for me please i will really appreciate it I'll mark brainliest i need it by the end of my geometry class

Answer: The correct answer is (a)combination.

Explanation: Direct combination and synthesis are the same process in which two reactants form to make a product

Answer: hydrogen bonding

Explanation:

When hydrogen atoms bond with oxygen atoms, there is hydrogen bonding.

Periodic table is important because it provides information, make easier to study and know about relationship between elements.

The periodic table is very important because it provides a huge amount of information about elements and their relationship to one another. The table can be used to know about the properties of elements.

So we can conclude that periodic table is important because it provides information, make easier to study and know about relationship between elements.

Learn more about table here: https://brainly.com/question/25630111

#SPJ1

Answer:

I think what you are looking for is below

Explanation:

CO2 + 2 NH3 →  (NH2)2CO + H2O

[tex]27 ~\text{cal} = \dfrac{27}{1000} ~ \text{kcal} = 0.027~ \text{kcal.}[/tex]

Answer:

Cl

Explanation:

In a covalent bond between Cl and H, (Cl) tends to attract electron density from the other element in the bond.

Chlorine is more electronegative than hydrogen. In general, elements towards the top-right of the periodic table are more electronegative. This is because these elements are desperate for a few more electrons to fill their outermost shell (and have a full octet). The more electronegative an element is, the more it wants electrons. As a result, highly electronegative atoms have a greater pull on the electrons in a covalent bond.

Answer:

If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas

(02) and 3.4 moles of carbon monoxide (CO) entered the reaction

Explanation:

The rule of three or is a way of solving problems of proportionality between three known

values and an unknown value, establishing a relationship of proportionality between all of

them. That is, what is intended with it is to find the fourth term of a proportion knowing the

other three. Remember that proportionality is a constant relationship or ratio between different

magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so

does the other (or when one magnitude decreases, so does the other), the direct rule of three

must be applied. To solve a direct rule of three, the following formula must be followed:

ab

cx

So

C*b

T =

a

In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the

relationship between the amount of reagents and products in a chemical reaction) and the rule

of three to calculate the quantities of moles requested:

.

,

If by stoichiometry 2 moles of CO2 are formed by 1 mol of O2, if 3.4 moles of CO2 are

formed, how many moles of O2 are needed?

molesofo2 = 3.42

=

moles of O2=1.7 moles

• If by stoichiometry 2 moles of CO2 are formed by 2 moles of CO, if 3.4 moles of CO2 are

formed, how many moles of CO are needed?

molesof CO =

=

3.4*2

2

moles of CO=3.4