CHEMISTRY MIDDLE SCHOOL

A gas mixture contains 1.61 moles of hydrogen and 2.31 moles of oxygen. What is the mole fraction of oxygen?a) 0.41
b) 0.59
c) 2.31
d) 3.92​
A gas mixture contains 1.61 moles of hydrogen and 2.31 - 1

Answers

Answer 1
Answer:

Answer: option B. 0.59

Explanation:Please see attachment for explanation

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7. An 8.92 kilogram bar of steel at 25°C is heated in order to shape it into a beam. The amount of heat energytransferred to the steel is found to be 5.82 x 103 kJ. If the specific heat capacity of steel is 0.51 op what was thechange in the temperature of the steel?​

Is the element CH4 a metal or non metal

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non metal i believe let me know if i helped

Which tool or tools would you use to measure and compare the mass of a cup of fresh water and a cup of salt water

Answers

You could use a scale to measure the mass as well as a cup to hold the water. If you were comparing the two, you should also probably use a graduated cylinder to get the same amount of each type of water.

Hope this helped ^_^

=:) ☆

Is mass conserved when 10 g of sodium hydroxide undergoes a chemical change during an interaction with 57 g of copper sulfate? Use complete sentences to support your answer by explaining how this can be demonstrated.

☆

please use complete sentences for the answer/an explanation, i'm confused on this questionn v( ‘.’ )v ...

Answers

Answer:Instead of “theory” scientists use the word hypothesis to describe a possible explanation for a scientific mystery. Theories in science are hypotheses that.

Explanation:

During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O).Which of the following are reactants in the chemical reaction described above?

Answers

Answer: NaOH and HCl are the reactants for the reaction described.

Explanation:

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. These are written on left side of the arrow.

Products are defined as the substance which are formed at the end of the chemical reaction. These are written on the right side of the arrow.

For the reaction of sodium hydroxide and hydrochloric acid, the equation represents:

NaOH+HCl\rightarrow NaCl+H_2O

Here, NaOH and HCl are reactants.

The above reaction is a type of neutralization reaction.
NaOH(sodium hydroxide) and HCl( hydrogen chloride) are reactants.

When 943 J of heat is added to 10 grams of oil at 28˚C , the temperature increases to 89˚C. What is the specific heat of the oil? PLZZZ HELP

Answers

Answer: 1.55 Jg°C

Explanation:

The quantity of Heat Energy (Q) required to heat a substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

Thus, Q = MCΦ

Since,

Q = 943 joules

Mass of oil = 10g

C = ? (let unknown value be Z)

Φ = (Final temperature - Initial temperature)

= 89°C - 28°C = 61°C

Then, Q = MCΦ

943 J = 10g x Z x 61°C

943J = 610g°C x Z

Z = (943J / 610g°C)

Z = 1.55 Jg°C

Thus, the specific heat of the oil is 1.55 Jg°C

What does the arrow mean in a chemical equation?

Answers

A reactionarrow simply indicates that something has changed and that one thing has become another.

What is a chemical reaction?

A chemicalreaction is a process that converts one or more substances, known as reactants, into one or more different substances, known as products.

Chemical elements or compounds are examples of substances. A chemical reaction rearranges the constituent atoms of the reactants to produce various products.

The most important characteristics of events occurring in the universe are chemical reactions.

Plants grow, fruit development, and biodegrade towards becoming rich in nitrogen for new plants through chemical reactions.

Humans along with all other animals reproduce, digest, grow, heal, and think as a result of chemical reactions.

The arrow connects the old and new things (the thing that formed). An equation of reaction employs the reactionarrow. The reactant is the thing that reacted.

Thus, this is the chief meaning of the arrow in a chemicalreaction, the it shown the reactants combined to form products.

For more details regarding chemical reactions, visit:

brainly.com/question/22817140

#SPJ6
I believe it means yield or equal

Hope this helps!
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